| 1 | /* |
| 2 | * ia32rtools |
| 3 | * (C) notaz, 2013,2014 |
| 4 | * |
| 5 | * This work is licensed under the terms of 3-clause BSD license. |
| 6 | * See COPYING file in the top-level directory. |
| 7 | */ |
| 8 | |
| 9 | #define _GNU_SOURCE |
| 10 | #include <stdio.h> |
| 11 | #include <stdlib.h> |
| 12 | #include <string.h> |
| 13 | |
| 14 | #include "my_assert.h" |
| 15 | #include "my_str.h" |
| 16 | |
| 17 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0])) |
| 18 | #define IS(w, y) !strcmp(w, y) |
| 19 | #define IS_START(w, y) !strncmp(w, y, strlen(y)) |
| 20 | |
| 21 | #include "protoparse.h" |
| 22 | |
| 23 | static const char *asmfn; |
| 24 | static int asmln; |
| 25 | static FILE *g_fhdr; |
| 26 | |
| 27 | #define anote(fmt, ...) \ |
| 28 | printf("%s:%d: note: " fmt, asmfn, asmln, ##__VA_ARGS__) |
| 29 | #define awarn(fmt, ...) \ |
| 30 | printf("%s:%d: warning: " fmt, asmfn, asmln, ##__VA_ARGS__) |
| 31 | #define aerr(fmt, ...) do { \ |
| 32 | printf("%s:%d: error: " fmt, asmfn, asmln, ##__VA_ARGS__); \ |
| 33 | fcloseall(); \ |
| 34 | exit(1); \ |
| 35 | } while (0) |
| 36 | |
| 37 | #include "masm_tools.h" |
| 38 | |
| 39 | enum op_flags { |
| 40 | OPF_RMD = (1 << 0), /* removed or optimized out */ |
| 41 | OPF_DATA = (1 << 1), /* data processing - writes to dst opr */ |
| 42 | OPF_FLAGS = (1 << 2), /* sets flags */ |
| 43 | OPF_JMP = (1 << 3), /* branch, call */ |
| 44 | OPF_CJMP = (1 << 4), /* cond. branch (cc or jecxz) */ |
| 45 | OPF_CC = (1 << 5), /* uses flags */ |
| 46 | OPF_TAIL = (1 << 6), /* ret or tail call */ |
| 47 | OPF_RSAVE = (1 << 7), /* push/pop is local reg save/load */ |
| 48 | OPF_REP = (1 << 8), /* prefixed by rep */ |
| 49 | OPF_REPZ = (1 << 9), /* rep is repe/repz */ |
| 50 | OPF_REPNZ = (1 << 10), /* rep is repne/repnz */ |
| 51 | OPF_FARG = (1 << 11), /* push collected as func arg (no reuse) */ |
| 52 | OPF_EBP_S = (1 << 12), /* ebp used as scratch here, not BP */ |
| 53 | OPF_DF = (1 << 13), /* DF flag set */ |
| 54 | OPF_ATAIL = (1 << 14), /* tail call with reused arg frame */ |
| 55 | OPF_32BIT = (1 << 15), /* 32bit division */ |
| 56 | OPF_LOCK = (1 << 16), /* op has lock prefix */ |
| 57 | OPF_VAPUSH = (1 << 17), /* vararg ptr push (as call arg) */ |
| 58 | }; |
| 59 | |
| 60 | enum op_op { |
| 61 | OP_INVAL, |
| 62 | OP_NOP, |
| 63 | OP_PUSH, |
| 64 | OP_POP, |
| 65 | OP_LEAVE, |
| 66 | OP_MOV, |
| 67 | OP_LEA, |
| 68 | OP_MOVZX, |
| 69 | OP_MOVSX, |
| 70 | OP_XCHG, |
| 71 | OP_NOT, |
| 72 | OP_CDQ, |
| 73 | OP_LODS, |
| 74 | OP_STOS, |
| 75 | OP_MOVS, |
| 76 | OP_CMPS, |
| 77 | OP_SCAS, |
| 78 | OP_STD, |
| 79 | OP_CLD, |
| 80 | OP_RET, |
| 81 | OP_ADD, |
| 82 | OP_SUB, |
| 83 | OP_AND, |
| 84 | OP_OR, |
| 85 | OP_XOR, |
| 86 | OP_SHL, |
| 87 | OP_SHR, |
| 88 | OP_SAR, |
| 89 | OP_ROL, |
| 90 | OP_ROR, |
| 91 | OP_RCL, |
| 92 | OP_RCR, |
| 93 | OP_ADC, |
| 94 | OP_SBB, |
| 95 | OP_BSF, |
| 96 | OP_INC, |
| 97 | OP_DEC, |
| 98 | OP_NEG, |
| 99 | OP_MUL, |
| 100 | OP_IMUL, |
| 101 | OP_DIV, |
| 102 | OP_IDIV, |
| 103 | OP_TEST, |
| 104 | OP_CMP, |
| 105 | OP_CALL, |
| 106 | OP_JMP, |
| 107 | OP_JECXZ, |
| 108 | OP_JCC, |
| 109 | OP_SCC, |
| 110 | }; |
| 111 | |
| 112 | enum opr_type { |
| 113 | OPT_UNSPEC, |
| 114 | OPT_REG, |
| 115 | OPT_REGMEM, |
| 116 | OPT_LABEL, |
| 117 | OPT_OFFSET, |
| 118 | OPT_CONST, |
| 119 | }; |
| 120 | |
| 121 | // must be sorted (larger len must be further in enum) |
| 122 | enum opr_lenmod { |
| 123 | OPLM_UNSPEC, |
| 124 | OPLM_BYTE, |
| 125 | OPLM_WORD, |
| 126 | OPLM_DWORD, |
| 127 | }; |
| 128 | |
| 129 | #define MAX_OPERANDS 3 |
| 130 | |
| 131 | struct parsed_opr { |
| 132 | enum opr_type type; |
| 133 | enum opr_lenmod lmod; |
| 134 | unsigned int is_ptr:1; // pointer in C |
| 135 | unsigned int is_array:1; // array in C |
| 136 | unsigned int type_from_var:1; // .. in header, sometimes wrong |
| 137 | unsigned int size_mismatch:1; // type override differs from C |
| 138 | unsigned int size_lt:1; // type override is larger than C |
| 139 | unsigned int had_ds:1; // had ds: prefix |
| 140 | const struct parsed_proto *pp; // for OPT_LABEL |
| 141 | int reg; |
| 142 | unsigned int val; |
| 143 | char name[112]; |
| 144 | }; |
| 145 | |
| 146 | struct parsed_op { |
| 147 | enum op_op op; |
| 148 | struct parsed_opr operand[MAX_OPERANDS]; |
| 149 | unsigned int flags; |
| 150 | unsigned char pfo; |
| 151 | unsigned char pfo_inv; |
| 152 | unsigned char operand_cnt; |
| 153 | unsigned char p_argnum; // push: altered before call arg # |
| 154 | unsigned char p_argpass;// push: arg of host func |
| 155 | unsigned char pad[3]; |
| 156 | int regmask_src; // all referensed regs |
| 157 | int regmask_dst; |
| 158 | int pfomask; // flagop: parsed_flag_op that can't be delayed |
| 159 | int cc_scratch; // scratch storage during analysis |
| 160 | int bt_i; // branch target for branches |
| 161 | struct parsed_data *btj;// branch targets for jumptables |
| 162 | struct parsed_proto *pp;// parsed_proto for OP_CALL |
| 163 | void *datap; |
| 164 | int asmln; |
| 165 | }; |
| 166 | |
| 167 | // datap: |
| 168 | // OP_CALL - parser proto hint (str) |
| 169 | // (OPF_CC) - point to one of (OPF_FLAGS) that affects cc op |
| 170 | // OP_POP - point to OP_PUSH in push/pop pair |
| 171 | |
| 172 | struct parsed_equ { |
| 173 | char name[64]; |
| 174 | enum opr_lenmod lmod; |
| 175 | int offset; |
| 176 | }; |
| 177 | |
| 178 | struct parsed_data { |
| 179 | char label[256]; |
| 180 | enum opr_type type; |
| 181 | enum opr_lenmod lmod; |
| 182 | int count; |
| 183 | int count_alloc; |
| 184 | struct { |
| 185 | union { |
| 186 | char *label; |
| 187 | unsigned int val; |
| 188 | } u; |
| 189 | int bt_i; |
| 190 | } *d; |
| 191 | }; |
| 192 | |
| 193 | struct label_ref { |
| 194 | int i; |
| 195 | struct label_ref *next; |
| 196 | }; |
| 197 | |
| 198 | enum ida_func_attr { |
| 199 | IDAFA_BP_FRAME = (1 << 0), |
| 200 | IDAFA_LIB_FUNC = (1 << 1), |
| 201 | IDAFA_STATIC = (1 << 2), |
| 202 | IDAFA_NORETURN = (1 << 3), |
| 203 | IDAFA_THUNK = (1 << 4), |
| 204 | IDAFA_FPD = (1 << 5), |
| 205 | }; |
| 206 | |
| 207 | #define MAX_OPS 4096 |
| 208 | |
| 209 | static struct parsed_op ops[MAX_OPS]; |
| 210 | static struct parsed_equ *g_eqs; |
| 211 | static int g_eqcnt; |
| 212 | static char g_labels[MAX_OPS][48]; |
| 213 | static struct label_ref g_label_refs[MAX_OPS]; |
| 214 | static const struct parsed_proto *g_func_pp; |
| 215 | static struct parsed_data *g_func_pd; |
| 216 | static int g_func_pd_cnt; |
| 217 | static char g_func[256]; |
| 218 | static char g_comment[256]; |
| 219 | static int g_bp_frame; |
| 220 | static int g_sp_frame; |
| 221 | static int g_stack_frame_used; |
| 222 | static int g_stack_fsz; |
| 223 | static int g_ida_func_attr; |
| 224 | static int g_allow_regfunc; |
| 225 | #define ferr(op_, fmt, ...) do { \ |
| 226 | printf("%s:%d: error: [%s] '%s': " fmt, asmfn, (op_)->asmln, g_func, \ |
| 227 | dump_op(op_), ##__VA_ARGS__); \ |
| 228 | fcloseall(); \ |
| 229 | exit(1); \ |
| 230 | } while (0) |
| 231 | #define fnote(op_, fmt, ...) \ |
| 232 | printf("%s:%d: note: [%s] '%s': " fmt, asmfn, (op_)->asmln, g_func, \ |
| 233 | dump_op(op_), ##__VA_ARGS__) |
| 234 | |
| 235 | #define MAX_REGS 8 |
| 236 | |
| 237 | const char *regs_r32[] = { "eax", "ebx", "ecx", "edx", "esi", "edi", "ebp", "esp" }; |
| 238 | const char *regs_r16[] = { "ax", "bx", "cx", "dx", "si", "di", "bp", "sp" }; |
| 239 | const char *regs_r8l[] = { "al", "bl", "cl", "dl" }; |
| 240 | const char *regs_r8h[] = { "ah", "bh", "ch", "dh" }; |
| 241 | |
| 242 | enum x86_regs { xUNSPEC = -1, xAX, xBX, xCX, xDX, xSI, xDI, xBP, xSP }; |
| 243 | |
| 244 | // possible basic comparison types (without inversion) |
| 245 | enum parsed_flag_op { |
| 246 | PFO_O, // 0 OF=1 |
| 247 | PFO_C, // 2 CF=1 |
| 248 | PFO_Z, // 4 ZF=1 |
| 249 | PFO_BE, // 6 CF=1||ZF=1 |
| 250 | PFO_S, // 8 SF=1 |
| 251 | PFO_P, // a PF=1 |
| 252 | PFO_L, // c SF!=OF |
| 253 | PFO_LE, // e ZF=1||SF!=OF |
| 254 | }; |
| 255 | |
| 256 | static const char *parsed_flag_op_names[] = { |
| 257 | "o", "c", "z", "be", "s", "p", "l", "le" |
| 258 | }; |
| 259 | |
| 260 | static int char_array_i(const char *array[], size_t len, const char *s) |
| 261 | { |
| 262 | int i; |
| 263 | |
| 264 | for (i = 0; i < len; i++) |
| 265 | if (IS(s, array[i])) |
| 266 | return i; |
| 267 | |
| 268 | return -1; |
| 269 | } |
| 270 | |
| 271 | static void printf_number(char *buf, size_t buf_size, |
| 272 | unsigned long number) |
| 273 | { |
| 274 | // output in C-friendly form |
| 275 | snprintf(buf, buf_size, number < 10 ? "%lu" : "0x%02lx", number); |
| 276 | } |
| 277 | |
| 278 | static int check_segment_prefix(const char *s) |
| 279 | { |
| 280 | if (s[0] == 0 || s[1] != 's' || s[2] != ':') |
| 281 | return 0; |
| 282 | |
| 283 | switch (s[0]) { |
| 284 | case 'c': return 1; |
| 285 | case 'd': return 2; |
| 286 | case 's': return 3; |
| 287 | case 'e': return 4; |
| 288 | case 'f': return 5; |
| 289 | case 'g': return 6; |
| 290 | default: return 0; |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | static int parse_reg(enum opr_lenmod *reg_lmod, const char *s) |
| 295 | { |
| 296 | int reg; |
| 297 | |
| 298 | reg = char_array_i(regs_r32, ARRAY_SIZE(regs_r32), s); |
| 299 | if (reg >= 0) { |
| 300 | *reg_lmod = OPLM_DWORD; |
| 301 | return reg; |
| 302 | } |
| 303 | reg = char_array_i(regs_r16, ARRAY_SIZE(regs_r16), s); |
| 304 | if (reg >= 0) { |
| 305 | *reg_lmod = OPLM_WORD; |
| 306 | return reg; |
| 307 | } |
| 308 | reg = char_array_i(regs_r8h, ARRAY_SIZE(regs_r8h), s); |
| 309 | if (reg >= 0) { |
| 310 | *reg_lmod = OPLM_BYTE; |
| 311 | return reg; |
| 312 | } |
| 313 | reg = char_array_i(regs_r8l, ARRAY_SIZE(regs_r8l), s); |
| 314 | if (reg >= 0) { |
| 315 | *reg_lmod = OPLM_BYTE; |
| 316 | return reg; |
| 317 | } |
| 318 | |
| 319 | return -1; |
| 320 | } |
| 321 | |
| 322 | static int parse_indmode(char *name, int *regmask, int need_c_cvt) |
| 323 | { |
| 324 | enum opr_lenmod lmod; |
| 325 | char cvtbuf[256]; |
| 326 | char *d = cvtbuf; |
| 327 | char *s = name; |
| 328 | char w[64]; |
| 329 | long number; |
| 330 | int reg; |
| 331 | int c = 0; |
| 332 | |
| 333 | *d = 0; |
| 334 | |
| 335 | while (*s != 0) { |
| 336 | d += strlen(d); |
| 337 | while (my_isblank(*s)) |
| 338 | s++; |
| 339 | for (; my_issep(*s); d++, s++) |
| 340 | *d = *s; |
| 341 | while (my_isblank(*s)) |
| 342 | s++; |
| 343 | *d = 0; |
| 344 | |
| 345 | // skip '?s:' prefixes |
| 346 | if (check_segment_prefix(s)) |
| 347 | s += 3; |
| 348 | |
| 349 | s = next_idt(w, sizeof(w), s); |
| 350 | if (w[0] == 0) |
| 351 | break; |
| 352 | c++; |
| 353 | |
| 354 | reg = parse_reg(&lmod, w); |
| 355 | if (reg >= 0) { |
| 356 | *regmask |= 1 << reg; |
| 357 | goto pass; |
| 358 | } |
| 359 | |
| 360 | if ('0' <= w[0] && w[0] <= '9') { |
| 361 | number = parse_number(w); |
| 362 | printf_number(d, sizeof(cvtbuf) - (d - cvtbuf), number); |
| 363 | continue; |
| 364 | } |
| 365 | |
| 366 | // probably some label/identifier - pass |
| 367 | |
| 368 | pass: |
| 369 | snprintf(d, sizeof(cvtbuf) - (d - cvtbuf), "%s", w); |
| 370 | } |
| 371 | |
| 372 | if (need_c_cvt) |
| 373 | strcpy(name, cvtbuf); |
| 374 | |
| 375 | return c; |
| 376 | } |
| 377 | |
| 378 | static int is_reg_in_str(const char *s) |
| 379 | { |
| 380 | int i; |
| 381 | |
| 382 | if (strlen(s) < 3 || (s[3] && !my_issep(s[3]) && !my_isblank(s[3]))) |
| 383 | return 0; |
| 384 | |
| 385 | for (i = 0; i < ARRAY_SIZE(regs_r32); i++) |
| 386 | if (!strncmp(s, regs_r32[i], 3)) |
| 387 | return 1; |
| 388 | |
| 389 | return 0; |
| 390 | } |
| 391 | |
| 392 | static const char *parse_stack_el(const char *name, char *extra_reg, |
| 393 | int early_try) |
| 394 | { |
| 395 | const char *p, *p2, *s; |
| 396 | char *endp = NULL; |
| 397 | char buf[32]; |
| 398 | long val; |
| 399 | int len; |
| 400 | |
| 401 | if (g_bp_frame || early_try) |
| 402 | { |
| 403 | p = name; |
| 404 | if (IS_START(p + 3, "+ebp+") && is_reg_in_str(p)) { |
| 405 | p += 4; |
| 406 | if (extra_reg != NULL) { |
| 407 | strncpy(extra_reg, name, 3); |
| 408 | extra_reg[4] = 0; |
| 409 | } |
| 410 | } |
| 411 | |
| 412 | if (IS_START(p, "ebp+")) { |
| 413 | p += 4; |
| 414 | |
| 415 | p2 = strchr(p, '+'); |
| 416 | if (p2 != NULL && is_reg_in_str(p)) { |
| 417 | if (extra_reg != NULL) { |
| 418 | strncpy(extra_reg, p, p2 - p); |
| 419 | extra_reg[p2 - p] = 0; |
| 420 | } |
| 421 | p = p2 + 1; |
| 422 | } |
| 423 | |
| 424 | if (!('0' <= *p && *p <= '9')) |
| 425 | return p; |
| 426 | |
| 427 | return NULL; |
| 428 | } |
| 429 | } |
| 430 | |
| 431 | if (!IS_START(name, "esp+")) |
| 432 | return NULL; |
| 433 | |
| 434 | s = name + 4; |
| 435 | p = strchr(s, '+'); |
| 436 | if (p) { |
| 437 | if (is_reg_in_str(s)) { |
| 438 | if (extra_reg != NULL) { |
| 439 | strncpy(extra_reg, s, p - s); |
| 440 | extra_reg[p - s] = 0; |
| 441 | } |
| 442 | s = p + 1; |
| 443 | p = strchr(s, '+'); |
| 444 | if (p == NULL) |
| 445 | aerr("%s IDA stackvar not set?\n", __func__); |
| 446 | } |
| 447 | if (!('0' <= *s && *s <= '9')) { |
| 448 | aerr("%s IDA stackvar offset not set?\n", __func__); |
| 449 | return NULL; |
| 450 | } |
| 451 | if (s[0] == '0' && s[1] == 'x') |
| 452 | s += 2; |
| 453 | len = p - s; |
| 454 | if (len < sizeof(buf) - 1) { |
| 455 | strncpy(buf, s, len); |
| 456 | buf[len] = 0; |
| 457 | val = strtol(buf, &endp, 16); |
| 458 | if (val == 0 || *endp != 0) { |
| 459 | aerr("%s num parse fail for '%s'\n", __func__, buf); |
| 460 | return NULL; |
| 461 | } |
| 462 | } |
| 463 | p++; |
| 464 | } |
| 465 | else |
| 466 | p = name + 4; |
| 467 | |
| 468 | if ('0' <= *p && *p <= '9') |
| 469 | return NULL; |
| 470 | |
| 471 | return p; |
| 472 | } |
| 473 | |
| 474 | static int guess_lmod_from_name(struct parsed_opr *opr) |
| 475 | { |
| 476 | if (!strncmp(opr->name, "dword_", 6)) { |
| 477 | opr->lmod = OPLM_DWORD; |
| 478 | return 1; |
| 479 | } |
| 480 | if (!strncmp(opr->name, "word_", 5)) { |
| 481 | opr->lmod = OPLM_WORD; |
| 482 | return 1; |
| 483 | } |
| 484 | if (!strncmp(opr->name, "byte_", 5)) { |
| 485 | opr->lmod = OPLM_BYTE; |
| 486 | return 1; |
| 487 | } |
| 488 | return 0; |
| 489 | } |
| 490 | |
| 491 | static int guess_lmod_from_c_type(enum opr_lenmod *lmod, |
| 492 | const struct parsed_type *c_type) |
| 493 | { |
| 494 | static const char *dword_types[] = { |
| 495 | "int", "_DWORD", "UINT_PTR", "DWORD", |
| 496 | "WPARAM", "LPARAM", "UINT", "__int32", |
| 497 | "LONG", "HIMC", "BOOL", "size_t", |
| 498 | }; |
| 499 | static const char *word_types[] = { |
| 500 | "uint16_t", "int16_t", "_WORD", "WORD", |
| 501 | "unsigned __int16", "__int16", |
| 502 | }; |
| 503 | static const char *byte_types[] = { |
| 504 | "uint8_t", "int8_t", "char", |
| 505 | "unsigned __int8", "__int8", "BYTE", "_BYTE", |
| 506 | "CHAR", "_UNKNOWN", |
| 507 | // structures.. deal the same as with _UNKNOWN for now |
| 508 | "CRITICAL_SECTION", |
| 509 | }; |
| 510 | const char *n; |
| 511 | int i; |
| 512 | |
| 513 | if (c_type->is_ptr) { |
| 514 | *lmod = OPLM_DWORD; |
| 515 | return 1; |
| 516 | } |
| 517 | |
| 518 | n = skip_type_mod(c_type->name); |
| 519 | |
| 520 | for (i = 0; i < ARRAY_SIZE(dword_types); i++) { |
| 521 | if (IS(n, dword_types[i])) { |
| 522 | *lmod = OPLM_DWORD; |
| 523 | return 1; |
| 524 | } |
| 525 | } |
| 526 | |
| 527 | for (i = 0; i < ARRAY_SIZE(word_types); i++) { |
| 528 | if (IS(n, word_types[i])) { |
| 529 | *lmod = OPLM_WORD; |
| 530 | return 1; |
| 531 | } |
| 532 | } |
| 533 | |
| 534 | for (i = 0; i < ARRAY_SIZE(byte_types); i++) { |
| 535 | if (IS(n, byte_types[i])) { |
| 536 | *lmod = OPLM_BYTE; |
| 537 | return 1; |
| 538 | } |
| 539 | } |
| 540 | |
| 541 | return 0; |
| 542 | } |
| 543 | |
| 544 | static char *default_cast_to(char *buf, size_t buf_size, |
| 545 | struct parsed_opr *opr) |
| 546 | { |
| 547 | buf[0] = 0; |
| 548 | |
| 549 | if (!opr->is_ptr) |
| 550 | return buf; |
| 551 | if (opr->pp == NULL || opr->pp->type.name == NULL |
| 552 | || opr->pp->is_fptr) |
| 553 | { |
| 554 | snprintf(buf, buf_size, "%s", "(void *)"); |
| 555 | return buf; |
| 556 | } |
| 557 | |
| 558 | snprintf(buf, buf_size, "(%s)", opr->pp->type.name); |
| 559 | return buf; |
| 560 | } |
| 561 | |
| 562 | static enum opr_type lmod_from_directive(const char *d) |
| 563 | { |
| 564 | if (IS(d, "dd")) |
| 565 | return OPLM_DWORD; |
| 566 | else if (IS(d, "dw")) |
| 567 | return OPLM_WORD; |
| 568 | else if (IS(d, "db")) |
| 569 | return OPLM_BYTE; |
| 570 | |
| 571 | aerr("unhandled directive: '%s'\n", d); |
| 572 | return OPLM_UNSPEC; |
| 573 | } |
| 574 | |
| 575 | static void setup_reg_opr(struct parsed_opr *opr, int reg, enum opr_lenmod lmod, |
| 576 | int *regmask) |
| 577 | { |
| 578 | opr->type = OPT_REG; |
| 579 | opr->reg = reg; |
| 580 | opr->lmod = lmod; |
| 581 | *regmask |= 1 << reg; |
| 582 | } |
| 583 | |
| 584 | static struct parsed_equ *equ_find(struct parsed_op *po, const char *name, |
| 585 | int *extra_offs); |
| 586 | |
| 587 | static int parse_operand(struct parsed_opr *opr, |
| 588 | int *regmask, int *regmask_indirect, |
| 589 | char words[16][256], int wordc, int w, unsigned int op_flags) |
| 590 | { |
| 591 | const struct parsed_proto *pp; |
| 592 | enum opr_lenmod tmplmod; |
| 593 | unsigned long number; |
| 594 | char buf[256]; |
| 595 | int ret, len; |
| 596 | int wordc_in; |
| 597 | char *p; |
| 598 | int i; |
| 599 | |
| 600 | if (w >= wordc) |
| 601 | aerr("parse_operand w %d, wordc %d\n", w, wordc); |
| 602 | |
| 603 | opr->reg = xUNSPEC; |
| 604 | |
| 605 | for (i = w; i < wordc; i++) { |
| 606 | len = strlen(words[i]); |
| 607 | if (words[i][len - 1] == ',') { |
| 608 | words[i][len - 1] = 0; |
| 609 | wordc = i + 1; |
| 610 | break; |
| 611 | } |
| 612 | } |
| 613 | |
| 614 | wordc_in = wordc - w; |
| 615 | |
| 616 | if ((op_flags & OPF_JMP) && wordc_in > 0 |
| 617 | && !('0' <= words[w][0] && words[w][0] <= '9')) |
| 618 | { |
| 619 | const char *label = NULL; |
| 620 | |
| 621 | if (wordc_in == 3 && !strncmp(words[w], "near", 4) |
| 622 | && IS(words[w + 1], "ptr")) |
| 623 | label = words[w + 2]; |
| 624 | else if (wordc_in == 2 && IS(words[w], "short")) |
| 625 | label = words[w + 1]; |
| 626 | else if (wordc_in == 1 |
| 627 | && strchr(words[w], '[') == NULL |
| 628 | && parse_reg(&tmplmod, words[w]) < 0) |
| 629 | label = words[w]; |
| 630 | |
| 631 | if (label != NULL) { |
| 632 | opr->type = OPT_LABEL; |
| 633 | ret = check_segment_prefix(label); |
| 634 | if (ret != 0) { |
| 635 | if (ret >= 5) |
| 636 | aerr("fs/gs used\n"); |
| 637 | opr->had_ds = 1; |
| 638 | label += 3; |
| 639 | } |
| 640 | strcpy(opr->name, label); |
| 641 | return wordc; |
| 642 | } |
| 643 | } |
| 644 | |
| 645 | if (wordc_in >= 3) { |
| 646 | if (IS(words[w + 1], "ptr")) { |
| 647 | if (IS(words[w], "dword")) |
| 648 | opr->lmod = OPLM_DWORD; |
| 649 | else if (IS(words[w], "word")) |
| 650 | opr->lmod = OPLM_WORD; |
| 651 | else if (IS(words[w], "byte")) |
| 652 | opr->lmod = OPLM_BYTE; |
| 653 | else |
| 654 | aerr("type parsing failed\n"); |
| 655 | w += 2; |
| 656 | wordc_in = wordc - w; |
| 657 | } |
| 658 | } |
| 659 | |
| 660 | if (wordc_in == 2) { |
| 661 | if (IS(words[w], "offset")) { |
| 662 | opr->type = OPT_OFFSET; |
| 663 | opr->lmod = OPLM_DWORD; |
| 664 | strcpy(opr->name, words[w + 1]); |
| 665 | pp = proto_parse(g_fhdr, opr->name, 1); |
| 666 | goto do_label; |
| 667 | } |
| 668 | if (IS(words[w], "(offset")) { |
| 669 | p = strchr(words[w + 1], ')'); |
| 670 | if (p == NULL) |
| 671 | aerr("parse of bracketed offset failed\n"); |
| 672 | *p = 0; |
| 673 | opr->type = OPT_OFFSET; |
| 674 | strcpy(opr->name, words[w + 1]); |
| 675 | return wordc; |
| 676 | } |
| 677 | } |
| 678 | |
| 679 | if (wordc_in != 1) |
| 680 | aerr("parse_operand 1 word expected\n"); |
| 681 | |
| 682 | ret = check_segment_prefix(words[w]); |
| 683 | if (ret != 0) { |
| 684 | if (ret >= 5) |
| 685 | aerr("fs/gs used\n"); |
| 686 | opr->had_ds = 1; |
| 687 | memmove(words[w], words[w] + 3, strlen(words[w]) - 2); |
| 688 | } |
| 689 | strcpy(opr->name, words[w]); |
| 690 | |
| 691 | if (words[w][0] == '[') { |
| 692 | opr->type = OPT_REGMEM; |
| 693 | ret = sscanf(words[w], "[%[^]]]", opr->name); |
| 694 | if (ret != 1) |
| 695 | aerr("[] parse failure\n"); |
| 696 | |
| 697 | parse_indmode(opr->name, regmask_indirect, 1); |
| 698 | if (opr->lmod == OPLM_UNSPEC && parse_stack_el(opr->name, NULL, 1)) |
| 699 | { |
| 700 | // might be an equ |
| 701 | struct parsed_equ *eq = |
| 702 | equ_find(NULL, parse_stack_el(opr->name, NULL, 1), &i); |
| 703 | if (eq) |
| 704 | opr->lmod = eq->lmod; |
| 705 | } |
| 706 | return wordc; |
| 707 | } |
| 708 | else if (strchr(words[w], '[')) { |
| 709 | // label[reg] form |
| 710 | p = strchr(words[w], '['); |
| 711 | opr->type = OPT_REGMEM; |
| 712 | parse_indmode(p, regmask_indirect, 0); |
| 713 | strncpy(buf, words[w], p - words[w]); |
| 714 | buf[p - words[w]] = 0; |
| 715 | pp = proto_parse(g_fhdr, buf, 1); |
| 716 | goto do_label; |
| 717 | } |
| 718 | else if (('0' <= words[w][0] && words[w][0] <= '9') |
| 719 | || words[w][0] == '-') |
| 720 | { |
| 721 | number = parse_number(words[w]); |
| 722 | opr->type = OPT_CONST; |
| 723 | opr->val = number; |
| 724 | printf_number(opr->name, sizeof(opr->name), number); |
| 725 | return wordc; |
| 726 | } |
| 727 | |
| 728 | ret = parse_reg(&tmplmod, opr->name); |
| 729 | if (ret >= 0) { |
| 730 | setup_reg_opr(opr, ret, tmplmod, regmask); |
| 731 | return wordc; |
| 732 | } |
| 733 | |
| 734 | // most likely var in data segment |
| 735 | opr->type = OPT_LABEL; |
| 736 | pp = proto_parse(g_fhdr, opr->name, 0); |
| 737 | |
| 738 | do_label: |
| 739 | if (pp != NULL) { |
| 740 | if (pp->is_fptr || pp->is_func) { |
| 741 | opr->lmod = OPLM_DWORD; |
| 742 | opr->is_ptr = 1; |
| 743 | } |
| 744 | else { |
| 745 | tmplmod = OPLM_UNSPEC; |
| 746 | if (!guess_lmod_from_c_type(&tmplmod, &pp->type)) |
| 747 | anote("unhandled C type '%s' for '%s'\n", |
| 748 | pp->type.name, opr->name); |
| 749 | |
| 750 | if (opr->lmod == OPLM_UNSPEC) { |
| 751 | opr->lmod = tmplmod; |
| 752 | opr->type_from_var = 1; |
| 753 | } |
| 754 | else if (opr->lmod != tmplmod) { |
| 755 | opr->size_mismatch = 1; |
| 756 | if (tmplmod < opr->lmod) |
| 757 | opr->size_lt = 1; |
| 758 | } |
| 759 | opr->is_ptr = pp->type.is_ptr; |
| 760 | } |
| 761 | opr->is_array = pp->type.is_array; |
| 762 | } |
| 763 | opr->pp = pp; |
| 764 | |
| 765 | if (opr->lmod == OPLM_UNSPEC) |
| 766 | guess_lmod_from_name(opr); |
| 767 | return wordc; |
| 768 | } |
| 769 | |
| 770 | static const struct { |
| 771 | const char *name; |
| 772 | unsigned int flags; |
| 773 | } pref_table[] = { |
| 774 | { "rep", OPF_REP }, |
| 775 | { "repe", OPF_REP|OPF_REPZ }, |
| 776 | { "repz", OPF_REP|OPF_REPZ }, |
| 777 | { "repne", OPF_REP|OPF_REPNZ }, |
| 778 | { "repnz", OPF_REP|OPF_REPNZ }, |
| 779 | { "lock", OPF_LOCK }, // ignored for now.. |
| 780 | }; |
| 781 | |
| 782 | #define OPF_CJMP_CC (OPF_JMP|OPF_CJMP|OPF_CC) |
| 783 | |
| 784 | static const struct { |
| 785 | const char *name; |
| 786 | enum op_op op; |
| 787 | unsigned short minopr; |
| 788 | unsigned short maxopr; |
| 789 | unsigned int flags; |
| 790 | unsigned char pfo; |
| 791 | unsigned char pfo_inv; |
| 792 | } op_table[] = { |
| 793 | { "nop", OP_NOP, 0, 0, 0 }, |
| 794 | { "push", OP_PUSH, 1, 1, 0 }, |
| 795 | { "pop", OP_POP, 1, 1, OPF_DATA }, |
| 796 | { "leave",OP_LEAVE, 0, 0, OPF_DATA }, |
| 797 | { "mov" , OP_MOV, 2, 2, OPF_DATA }, |
| 798 | { "lea", OP_LEA, 2, 2, OPF_DATA }, |
| 799 | { "movzx",OP_MOVZX, 2, 2, OPF_DATA }, |
| 800 | { "movsx",OP_MOVSX, 2, 2, OPF_DATA }, |
| 801 | { "xchg", OP_XCHG, 2, 2, OPF_DATA }, |
| 802 | { "not", OP_NOT, 1, 1, OPF_DATA }, |
| 803 | { "cdq", OP_CDQ, 0, 0, OPF_DATA }, |
| 804 | { "lodsb",OP_LODS, 0, 0, OPF_DATA }, |
| 805 | { "lodsw",OP_LODS, 0, 0, OPF_DATA }, |
| 806 | { "lodsd",OP_LODS, 0, 0, OPF_DATA }, |
| 807 | { "stosb",OP_STOS, 0, 0, OPF_DATA }, |
| 808 | { "stosw",OP_STOS, 0, 0, OPF_DATA }, |
| 809 | { "stosd",OP_STOS, 0, 0, OPF_DATA }, |
| 810 | { "movsb",OP_MOVS, 0, 0, OPF_DATA }, |
| 811 | { "movsw",OP_MOVS, 0, 0, OPF_DATA }, |
| 812 | { "movsd",OP_MOVS, 0, 0, OPF_DATA }, |
| 813 | { "cmpsb",OP_CMPS, 0, 0, OPF_DATA|OPF_FLAGS }, |
| 814 | { "cmpsw",OP_CMPS, 0, 0, OPF_DATA|OPF_FLAGS }, |
| 815 | { "cmpsd",OP_CMPS, 0, 0, OPF_DATA|OPF_FLAGS }, |
| 816 | { "scasb",OP_SCAS, 0, 0, OPF_DATA|OPF_FLAGS }, |
| 817 | { "scasw",OP_SCAS, 0, 0, OPF_DATA|OPF_FLAGS }, |
| 818 | { "scasd",OP_SCAS, 0, 0, OPF_DATA|OPF_FLAGS }, |
| 819 | { "std", OP_STD, 0, 0, OPF_DATA }, // special flag |
| 820 | { "cld", OP_CLD, 0, 0, OPF_DATA }, |
| 821 | { "add", OP_ADD, 2, 2, OPF_DATA|OPF_FLAGS }, |
| 822 | { "sub", OP_SUB, 2, 2, OPF_DATA|OPF_FLAGS }, |
| 823 | { "and", OP_AND, 2, 2, OPF_DATA|OPF_FLAGS }, |
| 824 | { "or", OP_OR, 2, 2, OPF_DATA|OPF_FLAGS }, |
| 825 | { "xor", OP_XOR, 2, 2, OPF_DATA|OPF_FLAGS }, |
| 826 | { "shl", OP_SHL, 2, 2, OPF_DATA|OPF_FLAGS }, |
| 827 | { "shr", OP_SHR, 2, 2, OPF_DATA|OPF_FLAGS }, |
| 828 | { "sal", OP_SHL, 2, 2, OPF_DATA|OPF_FLAGS }, |
| 829 | { "sar", OP_SAR, 2, 2, OPF_DATA|OPF_FLAGS }, |
| 830 | { "rol", OP_ROL, 2, 2, OPF_DATA|OPF_FLAGS }, |
| 831 | { "ror", OP_ROR, 2, 2, OPF_DATA|OPF_FLAGS }, |
| 832 | { "rcl", OP_RCL, 2, 2, OPF_DATA|OPF_FLAGS|OPF_CC, PFO_C }, |
| 833 | { "rcr", OP_RCR, 2, 2, OPF_DATA|OPF_FLAGS|OPF_CC, PFO_C }, |
| 834 | { "adc", OP_ADC, 2, 2, OPF_DATA|OPF_FLAGS|OPF_CC, PFO_C }, |
| 835 | { "sbb", OP_SBB, 2, 2, OPF_DATA|OPF_FLAGS|OPF_CC, PFO_C }, |
| 836 | { "bsf", OP_BSF, 2, 2, OPF_DATA|OPF_FLAGS }, |
| 837 | { "inc", OP_INC, 1, 1, OPF_DATA|OPF_FLAGS }, |
| 838 | { "dec", OP_DEC, 1, 1, OPF_DATA|OPF_FLAGS }, |
| 839 | { "neg", OP_NEG, 1, 1, OPF_DATA|OPF_FLAGS }, |
| 840 | { "mul", OP_MUL, 1, 1, OPF_DATA|OPF_FLAGS }, |
| 841 | { "imul", OP_IMUL, 1, 3, OPF_DATA|OPF_FLAGS }, |
| 842 | { "div", OP_DIV, 1, 1, OPF_DATA|OPF_FLAGS }, |
| 843 | { "idiv", OP_IDIV, 1, 1, OPF_DATA|OPF_FLAGS }, |
| 844 | { "test", OP_TEST, 2, 2, OPF_FLAGS }, |
| 845 | { "cmp", OP_CMP, 2, 2, OPF_FLAGS }, |
| 846 | { "retn", OP_RET, 0, 1, OPF_TAIL }, |
| 847 | { "call", OP_CALL, 1, 1, OPF_JMP|OPF_DATA|OPF_FLAGS }, |
| 848 | { "jmp", OP_JMP, 1, 1, OPF_JMP }, |
| 849 | { "jecxz",OP_JECXZ, 1, 1, OPF_JMP|OPF_CJMP }, |
| 850 | { "jo", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_O, 0 }, // 70 OF=1 |
| 851 | { "jno", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_O, 1 }, // 71 OF=0 |
| 852 | { "jc", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_C, 0 }, // 72 CF=1 |
| 853 | { "jb", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_C, 0 }, // 72 |
| 854 | { "jnc", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_C, 1 }, // 73 CF=0 |
| 855 | { "jnb", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_C, 1 }, // 73 |
| 856 | { "jae", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_C, 1 }, // 73 |
| 857 | { "jz", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_Z, 0 }, // 74 ZF=1 |
| 858 | { "je", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_Z, 0 }, // 74 |
| 859 | { "jnz", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_Z, 1 }, // 75 ZF=0 |
| 860 | { "jne", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_Z, 1 }, // 75 |
| 861 | { "jbe", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_BE, 0 }, // 76 CF=1||ZF=1 |
| 862 | { "jna", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_BE, 0 }, // 76 |
| 863 | { "ja", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_BE, 1 }, // 77 CF=0&&ZF=0 |
| 864 | { "jnbe", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_BE, 1 }, // 77 |
| 865 | { "js", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_S, 0 }, // 78 SF=1 |
| 866 | { "jns", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_S, 1 }, // 79 SF=0 |
| 867 | { "jp", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_P, 0 }, // 7a PF=1 |
| 868 | { "jpe", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_P, 0 }, // 7a |
| 869 | { "jnp", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_P, 1 }, // 7b PF=0 |
| 870 | { "jpo", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_P, 1 }, // 7b |
| 871 | { "jl", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_L, 0 }, // 7c SF!=OF |
| 872 | { "jnge", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_L, 0 }, // 7c |
| 873 | { "jge", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_L, 1 }, // 7d SF=OF |
| 874 | { "jnl", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_L, 1 }, // 7d |
| 875 | { "jle", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_LE, 0 }, // 7e ZF=1||SF!=OF |
| 876 | { "jng", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_LE, 0 }, // 7e |
| 877 | { "jg", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_LE, 1 }, // 7f ZF=0&&SF=OF |
| 878 | { "jnle", OP_JCC, 1, 1, OPF_CJMP_CC, PFO_LE, 1 }, // 7f |
| 879 | { "seto", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_O, 0 }, |
| 880 | { "setno", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_O, 1 }, |
| 881 | { "setc", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_C, 0 }, |
| 882 | { "setb", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_C, 0 }, |
| 883 | { "setnc", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_C, 1 }, |
| 884 | { "setae", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_C, 1 }, |
| 885 | { "setnb", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_C, 1 }, |
| 886 | { "setz", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_Z, 0 }, |
| 887 | { "sete", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_Z, 0 }, |
| 888 | { "setnz", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_Z, 1 }, |
| 889 | { "setne", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_Z, 1 }, |
| 890 | { "setbe", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_BE, 0 }, |
| 891 | { "setna", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_BE, 0 }, |
| 892 | { "seta", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_BE, 1 }, |
| 893 | { "setnbe", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_BE, 1 }, |
| 894 | { "sets", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_S, 0 }, |
| 895 | { "setns", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_S, 1 }, |
| 896 | { "setp", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_P, 0 }, |
| 897 | { "setpe", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_P, 0 }, |
| 898 | { "setnp", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_P, 1 }, |
| 899 | { "setpo", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_P, 1 }, |
| 900 | { "setl", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_L, 0 }, |
| 901 | { "setnge", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_L, 0 }, |
| 902 | { "setge", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_L, 1 }, |
| 903 | { "setnl", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_L, 1 }, |
| 904 | { "setle", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_LE, 0 }, |
| 905 | { "setng", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_LE, 0 }, |
| 906 | { "setg", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_LE, 1 }, |
| 907 | { "setnle", OP_SCC, 1, 1, OPF_DATA|OPF_CC, PFO_LE, 1 }, |
| 908 | }; |
| 909 | |
| 910 | static void parse_op(struct parsed_op *op, char words[16][256], int wordc) |
| 911 | { |
| 912 | enum opr_lenmod lmod = OPLM_UNSPEC; |
| 913 | int prefix_flags = 0; |
| 914 | int regmask_ind; |
| 915 | int regmask; |
| 916 | int op_w = 0; |
| 917 | int opr = 0; |
| 918 | int w = 0; |
| 919 | int i; |
| 920 | |
| 921 | for (i = 0; i < ARRAY_SIZE(pref_table); i++) { |
| 922 | if (IS(words[w], pref_table[i].name)) { |
| 923 | prefix_flags = pref_table[i].flags; |
| 924 | break; |
| 925 | } |
| 926 | } |
| 927 | |
| 928 | if (prefix_flags) { |
| 929 | if (wordc <= 1) |
| 930 | aerr("lone prefix: '%s'\n", words[0]); |
| 931 | w++; |
| 932 | } |
| 933 | |
| 934 | op_w = w; |
| 935 | for (i = 0; i < ARRAY_SIZE(op_table); i++) { |
| 936 | if (IS(words[w], op_table[i].name)) |
| 937 | break; |
| 938 | } |
| 939 | |
| 940 | if (i == ARRAY_SIZE(op_table)) |
| 941 | aerr("unhandled op: '%s'\n", words[0]); |
| 942 | w++; |
| 943 | |
| 944 | op->op = op_table[i].op; |
| 945 | op->flags = op_table[i].flags | prefix_flags; |
| 946 | op->pfo = op_table[i].pfo; |
| 947 | op->pfo_inv = op_table[i].pfo_inv; |
| 948 | op->regmask_src = op->regmask_dst = 0; |
| 949 | op->asmln = asmln; |
| 950 | |
| 951 | for (opr = 0; opr < op_table[i].minopr; opr++) { |
| 952 | regmask = regmask_ind = 0; |
| 953 | w = parse_operand(&op->operand[opr], ®mask, ®mask_ind, |
| 954 | words, wordc, w, op->flags); |
| 955 | |
| 956 | if (opr == 0 && (op->flags & OPF_DATA)) |
| 957 | op->regmask_dst = regmask; |
| 958 | // for now, mark dst as src too |
| 959 | op->regmask_src |= regmask | regmask_ind; |
| 960 | } |
| 961 | |
| 962 | for (; w < wordc && opr < op_table[i].maxopr; opr++) { |
| 963 | w = parse_operand(&op->operand[opr], |
| 964 | &op->regmask_src, &op->regmask_src, |
| 965 | words, wordc, w, op->flags); |
| 966 | } |
| 967 | |
| 968 | if (w < wordc) |
| 969 | aerr("parse_op %s incomplete: %d/%d\n", |
| 970 | words[0], w, wordc); |
| 971 | |
| 972 | // special cases |
| 973 | op->operand_cnt = opr; |
| 974 | if (!strncmp(op_table[i].name, "set", 3)) |
| 975 | op->operand[0].lmod = OPLM_BYTE; |
| 976 | |
| 977 | // ops with implicit argumets |
| 978 | switch (op->op) { |
| 979 | case OP_CDQ: |
| 980 | op->operand_cnt = 2; |
| 981 | setup_reg_opr(&op->operand[0], xDX, OPLM_DWORD, &op->regmask_dst); |
| 982 | setup_reg_opr(&op->operand[1], xAX, OPLM_DWORD, &op->regmask_src); |
| 983 | break; |
| 984 | |
| 985 | case OP_LODS: |
| 986 | case OP_STOS: |
| 987 | case OP_SCAS: |
| 988 | if (op->operand_cnt != 0) |
| 989 | break; |
| 990 | if (words[op_w][4] == 'b') |
| 991 | lmod = OPLM_BYTE; |
| 992 | else if (words[op_w][4] == 'w') |
| 993 | lmod = OPLM_WORD; |
| 994 | else if (words[op_w][4] == 'd') |
| 995 | lmod = OPLM_DWORD; |
| 996 | op->operand_cnt = 3; |
| 997 | setup_reg_opr(&op->operand[0], op->op == OP_LODS ? xSI : xDI, |
| 998 | lmod, &op->regmask_src); |
| 999 | setup_reg_opr(&op->operand[1], xCX, OPLM_DWORD, &op->regmask_src); |
| 1000 | op->regmask_dst = op->regmask_src; |
| 1001 | setup_reg_opr(&op->operand[2], xAX, OPLM_DWORD, |
| 1002 | op->op == OP_LODS ? &op->regmask_dst : &op->regmask_src); |
| 1003 | break; |
| 1004 | |
| 1005 | case OP_MOVS: |
| 1006 | case OP_CMPS: |
| 1007 | if (op->operand_cnt != 0) |
| 1008 | break; |
| 1009 | if (words[op_w][4] == 'b') |
| 1010 | lmod = OPLM_BYTE; |
| 1011 | else if (words[op_w][4] == 'w') |
| 1012 | lmod = OPLM_WORD; |
| 1013 | else if (words[op_w][4] == 'd') |
| 1014 | lmod = OPLM_DWORD; |
| 1015 | op->operand_cnt = 3; |
| 1016 | setup_reg_opr(&op->operand[0], xDI, lmod, &op->regmask_src); |
| 1017 | setup_reg_opr(&op->operand[1], xSI, OPLM_DWORD, &op->regmask_src); |
| 1018 | setup_reg_opr(&op->operand[2], xCX, OPLM_DWORD, &op->regmask_src); |
| 1019 | op->regmask_dst = op->regmask_src; |
| 1020 | break; |
| 1021 | |
| 1022 | case OP_XCHG: |
| 1023 | op->regmask_src |= op->regmask_dst; |
| 1024 | op->regmask_dst |= op->regmask_src; |
| 1025 | goto check_align; |
| 1026 | |
| 1027 | case OP_JECXZ: |
| 1028 | op->operand_cnt = 1; |
| 1029 | op->regmask_src = 1 << xCX; |
| 1030 | op->operand[0].type = OPT_REG; |
| 1031 | op->operand[0].reg = xCX; |
| 1032 | op->operand[0].lmod = OPLM_DWORD; |
| 1033 | break; |
| 1034 | |
| 1035 | case OP_IMUL: |
| 1036 | if (op->operand_cnt != 1) |
| 1037 | break; |
| 1038 | // fallthrough |
| 1039 | case OP_MUL: |
| 1040 | // singleop mul |
| 1041 | op->regmask_dst = (1 << xDX) | (1 << xAX); |
| 1042 | op->regmask_src |= (1 << xAX); |
| 1043 | if (op->operand[0].lmod == OPLM_UNSPEC) |
| 1044 | op->operand[0].lmod = OPLM_DWORD; |
| 1045 | break; |
| 1046 | |
| 1047 | case OP_DIV: |
| 1048 | case OP_IDIV: |
| 1049 | // we could set up operands for edx:eax, but there is no real need to |
| 1050 | // (see is_opr_modified()) |
| 1051 | regmask = (1 << xDX) | (1 << xAX); |
| 1052 | op->regmask_dst = regmask; |
| 1053 | op->regmask_src |= regmask; |
| 1054 | if (op->operand[0].lmod == OPLM_UNSPEC) |
| 1055 | op->operand[0].lmod = OPLM_DWORD; |
| 1056 | break; |
| 1057 | |
| 1058 | case OP_SHL: |
| 1059 | case OP_SHR: |
| 1060 | case OP_SAR: |
| 1061 | case OP_ROL: |
| 1062 | case OP_ROR: |
| 1063 | if (op->operand[1].lmod == OPLM_UNSPEC) |
| 1064 | op->operand[1].lmod = OPLM_BYTE; |
| 1065 | break; |
| 1066 | |
| 1067 | case OP_PUSH: |
| 1068 | if (op->operand[0].lmod == OPLM_UNSPEC |
| 1069 | && (op->operand[0].type == OPT_CONST |
| 1070 | || op->operand[0].type == OPT_OFFSET |
| 1071 | || op->operand[0].type == OPT_LABEL)) |
| 1072 | op->operand[0].lmod = OPLM_DWORD; |
| 1073 | break; |
| 1074 | |
| 1075 | // alignment |
| 1076 | case OP_MOV: |
| 1077 | check_align: |
| 1078 | if (op->operand[0].type == OPT_REG && op->operand[1].type == OPT_REG |
| 1079 | && op->operand[0].lmod == op->operand[1].lmod |
| 1080 | && op->operand[0].reg == op->operand[1].reg |
| 1081 | && IS(op->operand[0].name, op->operand[1].name)) // ah, al.. |
| 1082 | { |
| 1083 | op->flags |= OPF_RMD; |
| 1084 | op->regmask_src = op->regmask_dst = 0; |
| 1085 | } |
| 1086 | break; |
| 1087 | |
| 1088 | case OP_LEA: |
| 1089 | if (op->operand[0].type == OPT_REG |
| 1090 | && op->operand[1].type == OPT_REGMEM) |
| 1091 | { |
| 1092 | char buf[16]; |
| 1093 | snprintf(buf, sizeof(buf), "%s+0", op->operand[0].name); |
| 1094 | if (IS(buf, op->operand[1].name)) |
| 1095 | op->flags |= OPF_RMD; |
| 1096 | } |
| 1097 | break; |
| 1098 | |
| 1099 | case OP_CALL: |
| 1100 | // trashed regs must be explicitly detected later |
| 1101 | op->regmask_dst = 0; |
| 1102 | break; |
| 1103 | |
| 1104 | default: |
| 1105 | break; |
| 1106 | } |
| 1107 | } |
| 1108 | |
| 1109 | static const char *op_name(struct parsed_op *po) |
| 1110 | { |
| 1111 | static char buf[16]; |
| 1112 | char *p; |
| 1113 | int i; |
| 1114 | |
| 1115 | if (po->op == OP_JCC || po->op == OP_SCC) { |
| 1116 | p = buf; |
| 1117 | *p++ = (po->op == OP_JCC) ? 'j' : 's'; |
| 1118 | if (po->pfo_inv) |
| 1119 | *p++ = 'n'; |
| 1120 | strcpy(p, parsed_flag_op_names[po->pfo]); |
| 1121 | return buf; |
| 1122 | } |
| 1123 | |
| 1124 | for (i = 0; i < ARRAY_SIZE(op_table); i++) |
| 1125 | if (op_table[i].op == po->op) |
| 1126 | return op_table[i].name; |
| 1127 | |
| 1128 | return "???"; |
| 1129 | } |
| 1130 | |
| 1131 | // debug |
| 1132 | static const char *dump_op(struct parsed_op *po) |
| 1133 | { |
| 1134 | static char out[128]; |
| 1135 | char *p = out; |
| 1136 | int i; |
| 1137 | |
| 1138 | if (po == NULL) |
| 1139 | return "???"; |
| 1140 | |
| 1141 | snprintf(out, sizeof(out), "%s", op_name(po)); |
| 1142 | for (i = 0; i < po->operand_cnt; i++) { |
| 1143 | p += strlen(p); |
| 1144 | if (i > 0) |
| 1145 | *p++ = ','; |
| 1146 | snprintf(p, sizeof(out) - (p - out), |
| 1147 | po->operand[i].type == OPT_REGMEM ? " [%s]" : " %s", |
| 1148 | po->operand[i].name); |
| 1149 | } |
| 1150 | |
| 1151 | return out; |
| 1152 | } |
| 1153 | |
| 1154 | static const char *lmod_type_u(struct parsed_op *po, |
| 1155 | enum opr_lenmod lmod) |
| 1156 | { |
| 1157 | switch (lmod) { |
| 1158 | case OPLM_DWORD: |
| 1159 | return "u32"; |
| 1160 | case OPLM_WORD: |
| 1161 | return "u16"; |
| 1162 | case OPLM_BYTE: |
| 1163 | return "u8"; |
| 1164 | default: |
| 1165 | ferr(po, "invalid lmod: %d\n", lmod); |
| 1166 | return "(_invalid_)"; |
| 1167 | } |
| 1168 | } |
| 1169 | |
| 1170 | static const char *lmod_cast_u(struct parsed_op *po, |
| 1171 | enum opr_lenmod lmod) |
| 1172 | { |
| 1173 | switch (lmod) { |
| 1174 | case OPLM_DWORD: |
| 1175 | return ""; |
| 1176 | case OPLM_WORD: |
| 1177 | return "(u16)"; |
| 1178 | case OPLM_BYTE: |
| 1179 | return "(u8)"; |
| 1180 | default: |
| 1181 | ferr(po, "invalid lmod: %d\n", lmod); |
| 1182 | return "(_invalid_)"; |
| 1183 | } |
| 1184 | } |
| 1185 | |
| 1186 | static const char *lmod_cast_u_ptr(struct parsed_op *po, |
| 1187 | enum opr_lenmod lmod) |
| 1188 | { |
| 1189 | switch (lmod) { |
| 1190 | case OPLM_DWORD: |
| 1191 | return "*(u32 *)"; |
| 1192 | case OPLM_WORD: |
| 1193 | return "*(u16 *)"; |
| 1194 | case OPLM_BYTE: |
| 1195 | return "*(u8 *)"; |
| 1196 | default: |
| 1197 | ferr(po, "invalid lmod: %d\n", lmod); |
| 1198 | return "(_invalid_)"; |
| 1199 | } |
| 1200 | } |
| 1201 | |
| 1202 | static const char *lmod_cast_s(struct parsed_op *po, |
| 1203 | enum opr_lenmod lmod) |
| 1204 | { |
| 1205 | switch (lmod) { |
| 1206 | case OPLM_DWORD: |
| 1207 | return "(s32)"; |
| 1208 | case OPLM_WORD: |
| 1209 | return "(s16)"; |
| 1210 | case OPLM_BYTE: |
| 1211 | return "(s8)"; |
| 1212 | default: |
| 1213 | ferr(po, "%s: invalid lmod: %d\n", __func__, lmod); |
| 1214 | return "(_invalid_)"; |
| 1215 | } |
| 1216 | } |
| 1217 | |
| 1218 | static const char *lmod_cast(struct parsed_op *po, |
| 1219 | enum opr_lenmod lmod, int is_signed) |
| 1220 | { |
| 1221 | return is_signed ? |
| 1222 | lmod_cast_s(po, lmod) : |
| 1223 | lmod_cast_u(po, lmod); |
| 1224 | } |
| 1225 | |
| 1226 | static int lmod_bytes(struct parsed_op *po, enum opr_lenmod lmod) |
| 1227 | { |
| 1228 | switch (lmod) { |
| 1229 | case OPLM_DWORD: |
| 1230 | return 4; |
| 1231 | case OPLM_WORD: |
| 1232 | return 2; |
| 1233 | case OPLM_BYTE: |
| 1234 | return 1; |
| 1235 | default: |
| 1236 | ferr(po, "%s: invalid lmod: %d\n", __func__, lmod); |
| 1237 | return 0; |
| 1238 | } |
| 1239 | } |
| 1240 | |
| 1241 | static const char *opr_name(struct parsed_op *po, int opr_num) |
| 1242 | { |
| 1243 | if (opr_num >= po->operand_cnt) |
| 1244 | ferr(po, "opr OOR: %d/%d\n", opr_num, po->operand_cnt); |
| 1245 | return po->operand[opr_num].name; |
| 1246 | } |
| 1247 | |
| 1248 | static unsigned int opr_const(struct parsed_op *po, int opr_num) |
| 1249 | { |
| 1250 | if (opr_num >= po->operand_cnt) |
| 1251 | ferr(po, "opr OOR: %d/%d\n", opr_num, po->operand_cnt); |
| 1252 | if (po->operand[opr_num].type != OPT_CONST) |
| 1253 | ferr(po, "opr %d: const expected\n", opr_num); |
| 1254 | return po->operand[opr_num].val; |
| 1255 | } |
| 1256 | |
| 1257 | static const char *opr_reg_p(struct parsed_op *po, struct parsed_opr *popr) |
| 1258 | { |
| 1259 | if ((unsigned int)popr->reg >= MAX_REGS) |
| 1260 | ferr(po, "invalid reg: %d\n", popr->reg); |
| 1261 | return regs_r32[popr->reg]; |
| 1262 | } |
| 1263 | |
| 1264 | // cast1 is the "final" cast |
| 1265 | static const char *simplify_cast(const char *cast1, const char *cast2) |
| 1266 | { |
| 1267 | static char buf[256]; |
| 1268 | |
| 1269 | if (cast1[0] == 0) |
| 1270 | return cast2; |
| 1271 | if (cast2[0] == 0) |
| 1272 | return cast1; |
| 1273 | if (IS(cast1, cast2)) |
| 1274 | return cast1; |
| 1275 | if (IS(cast1, "(s8)") && IS(cast2, "(u8)")) |
| 1276 | return cast1; |
| 1277 | if (IS(cast1, "(s16)") && IS(cast2, "(u16)")) |
| 1278 | return cast1; |
| 1279 | if (IS(cast1, "(u8)") && IS_START(cast2, "*(u8 *)")) |
| 1280 | return cast2; |
| 1281 | if (IS(cast1, "(u16)") && IS_START(cast2, "*(u16 *)")) |
| 1282 | return cast2; |
| 1283 | if (strchr(cast1, '*') && IS_START(cast2, "(u32)")) |
| 1284 | return cast1; |
| 1285 | |
| 1286 | snprintf(buf, sizeof(buf), "%s%s", cast1, cast2); |
| 1287 | return buf; |
| 1288 | } |
| 1289 | |
| 1290 | static const char *simplify_cast_num(const char *cast, unsigned int val) |
| 1291 | { |
| 1292 | if (IS(cast, "(u8)") && val < 0x100) |
| 1293 | return ""; |
| 1294 | if (IS(cast, "(s8)") && val < 0x80) |
| 1295 | return ""; |
| 1296 | if (IS(cast, "(u16)") && val < 0x10000) |
| 1297 | return ""; |
| 1298 | if (IS(cast, "(s16)") && val < 0x8000) |
| 1299 | return ""; |
| 1300 | if (IS(cast, "(s32)") && val < 0x80000000) |
| 1301 | return ""; |
| 1302 | |
| 1303 | return cast; |
| 1304 | } |
| 1305 | |
| 1306 | static struct parsed_equ *equ_find(struct parsed_op *po, const char *name, |
| 1307 | int *extra_offs) |
| 1308 | { |
| 1309 | const char *p; |
| 1310 | char *endp; |
| 1311 | int namelen; |
| 1312 | int i; |
| 1313 | |
| 1314 | *extra_offs = 0; |
| 1315 | namelen = strlen(name); |
| 1316 | |
| 1317 | p = strchr(name, '+'); |
| 1318 | if (p != NULL) { |
| 1319 | namelen = p - name; |
| 1320 | if (namelen <= 0) |
| 1321 | ferr(po, "equ parse failed for '%s'\n", name); |
| 1322 | |
| 1323 | if (IS_START(p, "0x")) |
| 1324 | p += 2; |
| 1325 | *extra_offs = strtol(p, &endp, 16); |
| 1326 | if (*endp != 0) |
| 1327 | ferr(po, "equ parse failed for '%s'\n", name); |
| 1328 | } |
| 1329 | |
| 1330 | for (i = 0; i < g_eqcnt; i++) |
| 1331 | if (strncmp(g_eqs[i].name, name, namelen) == 0 |
| 1332 | && g_eqs[i].name[namelen] == 0) |
| 1333 | break; |
| 1334 | if (i >= g_eqcnt) { |
| 1335 | if (po != NULL) |
| 1336 | ferr(po, "unresolved equ name: '%s'\n", name); |
| 1337 | return NULL; |
| 1338 | } |
| 1339 | |
| 1340 | return &g_eqs[i]; |
| 1341 | } |
| 1342 | |
| 1343 | static int is_stack_access(struct parsed_op *po, |
| 1344 | const struct parsed_opr *popr) |
| 1345 | { |
| 1346 | return (parse_stack_el(popr->name, NULL, 0) |
| 1347 | || (g_bp_frame && !(po->flags & OPF_EBP_S) |
| 1348 | && IS_START(popr->name, "ebp"))); |
| 1349 | } |
| 1350 | |
| 1351 | static void parse_stack_access(struct parsed_op *po, |
| 1352 | const char *name, char *ofs_reg, int *offset_out, |
| 1353 | int *stack_ra_out, const char **bp_arg_out, int is_lea) |
| 1354 | { |
| 1355 | const char *bp_arg = ""; |
| 1356 | const char *p = NULL; |
| 1357 | struct parsed_equ *eq; |
| 1358 | char *endp = NULL; |
| 1359 | int stack_ra = 0; |
| 1360 | int offset = 0; |
| 1361 | |
| 1362 | ofs_reg[0] = 0; |
| 1363 | |
| 1364 | if (IS_START(name, "ebp-") |
| 1365 | || (IS_START(name, "ebp+") && '0' <= name[4] && name[4] <= '9')) |
| 1366 | { |
| 1367 | p = name + 4; |
| 1368 | if (IS_START(p, "0x")) |
| 1369 | p += 2; |
| 1370 | offset = strtoul(p, &endp, 16); |
| 1371 | if (name[3] == '-') |
| 1372 | offset = -offset; |
| 1373 | if (*endp != 0) |
| 1374 | ferr(po, "ebp- parse of '%s' failed\n", name); |
| 1375 | } |
| 1376 | else { |
| 1377 | bp_arg = parse_stack_el(name, ofs_reg, 0); |
| 1378 | snprintf(g_comment, sizeof(g_comment), "%s", bp_arg); |
| 1379 | eq = equ_find(po, bp_arg, &offset); |
| 1380 | if (eq == NULL) |
| 1381 | ferr(po, "detected but missing eq\n"); |
| 1382 | offset += eq->offset; |
| 1383 | } |
| 1384 | |
| 1385 | if (!strncmp(name, "ebp", 3)) |
| 1386 | stack_ra = 4; |
| 1387 | |
| 1388 | // yes it sometimes LEAs ra for compares.. |
| 1389 | if (!is_lea && ofs_reg[0] == 0 |
| 1390 | && stack_ra <= offset && offset < stack_ra + 4) |
| 1391 | { |
| 1392 | ferr(po, "reference to ra? %d %d\n", offset, stack_ra); |
| 1393 | } |
| 1394 | |
| 1395 | *offset_out = offset; |
| 1396 | *stack_ra_out = stack_ra; |
| 1397 | if (bp_arg_out) |
| 1398 | *bp_arg_out = bp_arg; |
| 1399 | } |
| 1400 | |
| 1401 | static int stack_frame_access(struct parsed_op *po, |
| 1402 | struct parsed_opr *popr, char *buf, size_t buf_size, |
| 1403 | const char *name, const char *cast, int is_src, int is_lea) |
| 1404 | { |
| 1405 | enum opr_lenmod tmp_lmod = OPLM_UNSPEC; |
| 1406 | const char *prefix = ""; |
| 1407 | const char *bp_arg = NULL; |
| 1408 | char ofs_reg[16] = { 0, }; |
| 1409 | int i, arg_i, arg_s; |
| 1410 | int unaligned = 0; |
| 1411 | int stack_ra = 0; |
| 1412 | int offset = 0; |
| 1413 | int retval = -1; |
| 1414 | int sf_ofs; |
| 1415 | int lim; |
| 1416 | |
| 1417 | if (po->flags & OPF_EBP_S) |
| 1418 | ferr(po, "stack_frame_access while ebp is scratch\n"); |
| 1419 | |
| 1420 | parse_stack_access(po, name, ofs_reg, &offset, |
| 1421 | &stack_ra, &bp_arg, is_lea); |
| 1422 | |
| 1423 | if (offset > stack_ra) |
| 1424 | { |
| 1425 | arg_i = (offset - stack_ra - 4) / 4; |
| 1426 | if (arg_i < 0 || arg_i >= g_func_pp->argc_stack) |
| 1427 | { |
| 1428 | if (g_func_pp->is_vararg |
| 1429 | && arg_i == g_func_pp->argc_stack && is_lea) |
| 1430 | { |
| 1431 | // should be va_list |
| 1432 | if (cast[0] == 0) |
| 1433 | cast = "(u32)"; |
| 1434 | snprintf(buf, buf_size, "%sap", cast); |
| 1435 | return -1; |
| 1436 | } |
| 1437 | ferr(po, "offset %d (%s,%d) doesn't map to any arg\n", |
| 1438 | offset, bp_arg, arg_i); |
| 1439 | } |
| 1440 | if (ofs_reg[0] != 0) |
| 1441 | ferr(po, "offset reg on arg access?\n"); |
| 1442 | |
| 1443 | for (i = arg_s = 0; i < g_func_pp->argc; i++) { |
| 1444 | if (g_func_pp->arg[i].reg != NULL) |
| 1445 | continue; |
| 1446 | if (arg_s == arg_i) |
| 1447 | break; |
| 1448 | arg_s++; |
| 1449 | } |
| 1450 | if (i == g_func_pp->argc) |
| 1451 | ferr(po, "arg %d not in prototype?\n", arg_i); |
| 1452 | |
| 1453 | popr->is_ptr = g_func_pp->arg[i].type.is_ptr; |
| 1454 | retval = i; |
| 1455 | |
| 1456 | switch (popr->lmod) |
| 1457 | { |
| 1458 | case OPLM_BYTE: |
| 1459 | if (is_lea) |
| 1460 | ferr(po, "lea/byte to arg?\n"); |
| 1461 | if (is_src && (offset & 3) == 0) |
| 1462 | snprintf(buf, buf_size, "%sa%d", |
| 1463 | simplify_cast(cast, "(u8)"), i + 1); |
| 1464 | else |
| 1465 | snprintf(buf, buf_size, "%sBYTE%d(a%d)", |
| 1466 | cast, offset & 3, i + 1); |
| 1467 | break; |
| 1468 | |
| 1469 | case OPLM_WORD: |
| 1470 | if (is_lea) |
| 1471 | ferr(po, "lea/word to arg?\n"); |
| 1472 | if (offset & 1) { |
| 1473 | unaligned = 1; |
| 1474 | if (!is_src) { |
| 1475 | if (offset & 2) |
| 1476 | ferr(po, "problematic arg store\n"); |
| 1477 | snprintf(buf, buf_size, "%s((char *)&a%d + 1)", |
| 1478 | simplify_cast(cast, "*(u16 *)"), i + 1); |
| 1479 | } |
| 1480 | else |
| 1481 | ferr(po, "unaligned arg word load\n"); |
| 1482 | } |
| 1483 | else if (is_src && (offset & 2) == 0) |
| 1484 | snprintf(buf, buf_size, "%sa%d", |
| 1485 | simplify_cast(cast, "(u16)"), i + 1); |
| 1486 | else |
| 1487 | snprintf(buf, buf_size, "%s%sWORD(a%d)", |
| 1488 | cast, (offset & 2) ? "HI" : "LO", i + 1); |
| 1489 | break; |
| 1490 | |
| 1491 | case OPLM_DWORD: |
| 1492 | if (cast[0]) |
| 1493 | prefix = cast; |
| 1494 | else if (is_src) |
| 1495 | prefix = "(u32)"; |
| 1496 | |
| 1497 | if (offset & 3) { |
| 1498 | unaligned = 1; |
| 1499 | if (is_lea) |
| 1500 | snprintf(buf, buf_size, "(u32)&a%d + %d", |
| 1501 | i + 1, offset & 3); |
| 1502 | else if (!is_src) |
| 1503 | ferr(po, "unaligned arg store\n"); |
| 1504 | else { |
| 1505 | // mov edx, [ebp+arg_4+2]; movsx ecx, dx |
| 1506 | snprintf(buf, buf_size, "%s(a%d >> %d)", |
| 1507 | prefix, i + 1, (offset & 3) * 8); |
| 1508 | } |
| 1509 | } |
| 1510 | else { |
| 1511 | snprintf(buf, buf_size, "%s%sa%d", |
| 1512 | prefix, is_lea ? "&" : "", i + 1); |
| 1513 | } |
| 1514 | break; |
| 1515 | |
| 1516 | default: |
| 1517 | ferr(po, "bp_arg bad lmod: %d\n", popr->lmod); |
| 1518 | } |
| 1519 | |
| 1520 | if (unaligned) |
| 1521 | snprintf(g_comment, sizeof(g_comment), "%s unaligned", bp_arg); |
| 1522 | |
| 1523 | // common problem |
| 1524 | guess_lmod_from_c_type(&tmp_lmod, &g_func_pp->arg[i].type); |
| 1525 | if (tmp_lmod != OPLM_DWORD |
| 1526 | && (unaligned || (!is_src && lmod_bytes(po, tmp_lmod) |
| 1527 | < lmod_bytes(po, popr->lmod) + (offset & 3)))) |
| 1528 | { |
| 1529 | ferr(po, "bp_arg arg%d/w offset %d and type '%s' is too small\n", |
| 1530 | i + 1, offset, g_func_pp->arg[i].type.name); |
| 1531 | } |
| 1532 | // can't check this because msvc likes to reuse |
| 1533 | // arg space for scratch.. |
| 1534 | //if (popr->is_ptr && popr->lmod != OPLM_DWORD) |
| 1535 | // ferr(po, "bp_arg arg%d: non-dword ptr access\n", i + 1); |
| 1536 | } |
| 1537 | else |
| 1538 | { |
| 1539 | if (g_stack_fsz == 0) |
| 1540 | ferr(po, "stack var access without stackframe\n"); |
| 1541 | g_stack_frame_used = 1; |
| 1542 | |
| 1543 | sf_ofs = g_stack_fsz + offset; |
| 1544 | lim = (ofs_reg[0] != 0) ? -4 : 0; |
| 1545 | if (offset > 0 || sf_ofs < lim) |
| 1546 | ferr(po, "bp_stack offset %d/%d\n", offset, g_stack_fsz); |
| 1547 | |
| 1548 | if (is_lea) |
| 1549 | prefix = "(u32)&"; |
| 1550 | else |
| 1551 | prefix = cast; |
| 1552 | |
| 1553 | switch (popr->lmod) |
| 1554 | { |
| 1555 | case OPLM_BYTE: |
| 1556 | snprintf(buf, buf_size, "%ssf.b[%d%s%s]", |
| 1557 | prefix, sf_ofs, ofs_reg[0] ? "+" : "", ofs_reg); |
| 1558 | break; |
| 1559 | |
| 1560 | case OPLM_WORD: |
| 1561 | if ((sf_ofs & 1) || ofs_reg[0] != 0) { |
| 1562 | // known unaligned or possibly unaligned |
| 1563 | strcat(g_comment, " unaligned"); |
| 1564 | if (prefix[0] == 0) |
| 1565 | prefix = "*(u16 *)&"; |
| 1566 | snprintf(buf, buf_size, "%ssf.b[%d%s%s]", |
| 1567 | prefix, sf_ofs, ofs_reg[0] ? "+" : "", ofs_reg); |
| 1568 | break; |
| 1569 | } |
| 1570 | snprintf(buf, buf_size, "%ssf.w[%d]", prefix, sf_ofs / 2); |
| 1571 | break; |
| 1572 | |
| 1573 | case OPLM_DWORD: |
| 1574 | if ((sf_ofs & 3) || ofs_reg[0] != 0) { |
| 1575 | // known unaligned or possibly unaligned |
| 1576 | strcat(g_comment, " unaligned"); |
| 1577 | if (prefix[0] == 0) |
| 1578 | prefix = "*(u32 *)&"; |
| 1579 | snprintf(buf, buf_size, "%ssf.b[%d%s%s]", |
| 1580 | prefix, sf_ofs, ofs_reg[0] ? "+" : "", ofs_reg); |
| 1581 | break; |
| 1582 | } |
| 1583 | snprintf(buf, buf_size, "%ssf.d[%d]", prefix, sf_ofs / 4); |
| 1584 | break; |
| 1585 | |
| 1586 | default: |
| 1587 | ferr(po, "bp_stack bad lmod: %d\n", popr->lmod); |
| 1588 | } |
| 1589 | } |
| 1590 | |
| 1591 | return retval; |
| 1592 | } |
| 1593 | |
| 1594 | static void check_func_pp(struct parsed_op *po, |
| 1595 | const struct parsed_proto *pp, const char *pfx) |
| 1596 | { |
| 1597 | enum opr_lenmod tmp_lmod; |
| 1598 | char buf[256]; |
| 1599 | int ret, i; |
| 1600 | |
| 1601 | if (pp->argc_reg != 0) { |
| 1602 | if (/*!g_allow_regfunc &&*/ !pp->is_fastcall) { |
| 1603 | pp_print(buf, sizeof(buf), pp); |
| 1604 | ferr(po, "%s: unexpected reg arg in icall: %s\n", pfx, buf); |
| 1605 | } |
| 1606 | if (pp->argc_stack > 0 && pp->argc_reg != 2) |
| 1607 | ferr(po, "%s: %d reg arg(s) with %d stack arg(s)\n", |
| 1608 | pfx, pp->argc_reg, pp->argc_stack); |
| 1609 | } |
| 1610 | |
| 1611 | // fptrs must use 32bit args, callsite might have no information and |
| 1612 | // lack a cast to smaller types, which results in incorrectly masked |
| 1613 | // args passed (callee may assume masked args, it does on ARM) |
| 1614 | if (!pp->is_oslib) { |
| 1615 | for (i = 0; i < pp->argc; i++) { |
| 1616 | ret = guess_lmod_from_c_type(&tmp_lmod, &pp->arg[i].type); |
| 1617 | if (ret && tmp_lmod != OPLM_DWORD) |
| 1618 | ferr(po, "reference to %s with arg%d '%s'\n", pp->name, |
| 1619 | i + 1, pp->arg[i].type.name); |
| 1620 | } |
| 1621 | } |
| 1622 | } |
| 1623 | |
| 1624 | static const char *check_label_read_ref(struct parsed_op *po, |
| 1625 | const char *name) |
| 1626 | { |
| 1627 | const struct parsed_proto *pp; |
| 1628 | |
| 1629 | pp = proto_parse(g_fhdr, name, 0); |
| 1630 | if (pp == NULL) |
| 1631 | ferr(po, "proto_parse failed for ref '%s'\n", name); |
| 1632 | |
| 1633 | if (pp->is_func) |
| 1634 | check_func_pp(po, pp, "ref"); |
| 1635 | |
| 1636 | return pp->name; |
| 1637 | } |
| 1638 | |
| 1639 | static char *out_src_opr(char *buf, size_t buf_size, |
| 1640 | struct parsed_op *po, struct parsed_opr *popr, const char *cast, |
| 1641 | int is_lea) |
| 1642 | { |
| 1643 | char tmp1[256], tmp2[256]; |
| 1644 | char expr[256]; |
| 1645 | const char *name; |
| 1646 | char *p; |
| 1647 | int ret; |
| 1648 | |
| 1649 | if (cast == NULL) |
| 1650 | cast = ""; |
| 1651 | |
| 1652 | switch (popr->type) { |
| 1653 | case OPT_REG: |
| 1654 | if (is_lea) |
| 1655 | ferr(po, "lea from reg?\n"); |
| 1656 | |
| 1657 | switch (popr->lmod) { |
| 1658 | case OPLM_DWORD: |
| 1659 | snprintf(buf, buf_size, "%s%s", cast, opr_reg_p(po, popr)); |
| 1660 | break; |
| 1661 | case OPLM_WORD: |
| 1662 | snprintf(buf, buf_size, "%s%s", |
| 1663 | simplify_cast(cast, "(u16)"), opr_reg_p(po, popr)); |
| 1664 | break; |
| 1665 | case OPLM_BYTE: |
| 1666 | if (popr->name[1] == 'h') // XXX.. |
| 1667 | snprintf(buf, buf_size, "%s(%s >> 8)", |
| 1668 | simplify_cast(cast, "(u8)"), opr_reg_p(po, popr)); |
| 1669 | else |
| 1670 | snprintf(buf, buf_size, "%s%s", |
| 1671 | simplify_cast(cast, "(u8)"), opr_reg_p(po, popr)); |
| 1672 | break; |
| 1673 | default: |
| 1674 | ferr(po, "invalid src lmod: %d\n", popr->lmod); |
| 1675 | } |
| 1676 | break; |
| 1677 | |
| 1678 | case OPT_REGMEM: |
| 1679 | if (is_stack_access(po, popr)) { |
| 1680 | stack_frame_access(po, popr, buf, buf_size, |
| 1681 | popr->name, cast, 1, is_lea); |
| 1682 | break; |
| 1683 | } |
| 1684 | |
| 1685 | strcpy(expr, popr->name); |
| 1686 | if (strchr(expr, '[')) { |
| 1687 | // special case: '[' can only be left for label[reg] form |
| 1688 | ret = sscanf(expr, "%[^[][%[^]]]", tmp1, tmp2); |
| 1689 | if (ret != 2) |
| 1690 | ferr(po, "parse failure for '%s'\n", expr); |
| 1691 | if (tmp1[0] == '(') { |
| 1692 | // (off_4FFF50+3)[eax] |
| 1693 | p = strchr(tmp1 + 1, ')'); |
| 1694 | if (p == NULL || p[1] != 0) |
| 1695 | ferr(po, "parse failure (2) for '%s'\n", expr); |
| 1696 | *p = 0; |
| 1697 | memmove(tmp1, tmp1 + 1, strlen(tmp1)); |
| 1698 | } |
| 1699 | snprintf(expr, sizeof(expr), "(u32)&%s + %s", tmp1, tmp2); |
| 1700 | } |
| 1701 | |
| 1702 | // XXX: do we need more parsing? |
| 1703 | if (is_lea) { |
| 1704 | snprintf(buf, buf_size, "%s", expr); |
| 1705 | break; |
| 1706 | } |
| 1707 | |
| 1708 | snprintf(buf, buf_size, "%s(%s)", |
| 1709 | simplify_cast(cast, lmod_cast_u_ptr(po, popr->lmod)), expr); |
| 1710 | break; |
| 1711 | |
| 1712 | case OPT_LABEL: |
| 1713 | name = check_label_read_ref(po, popr->name); |
| 1714 | if (cast[0] == 0 && popr->is_ptr) |
| 1715 | cast = "(u32)"; |
| 1716 | |
| 1717 | if (is_lea) |
| 1718 | snprintf(buf, buf_size, "(u32)&%s", name); |
| 1719 | else if (popr->size_lt) |
| 1720 | snprintf(buf, buf_size, "%s%s%s%s", cast, |
| 1721 | lmod_cast_u_ptr(po, popr->lmod), |
| 1722 | popr->is_array ? "" : "&", name); |
| 1723 | else |
| 1724 | snprintf(buf, buf_size, "%s%s%s", cast, name, |
| 1725 | popr->is_array ? "[0]" : ""); |
| 1726 | break; |
| 1727 | |
| 1728 | case OPT_OFFSET: |
| 1729 | name = check_label_read_ref(po, popr->name); |
| 1730 | if (cast[0] == 0) |
| 1731 | cast = "(u32)"; |
| 1732 | if (is_lea) |
| 1733 | ferr(po, "lea an offset?\n"); |
| 1734 | snprintf(buf, buf_size, "%s&%s", cast, name); |
| 1735 | break; |
| 1736 | |
| 1737 | case OPT_CONST: |
| 1738 | if (is_lea) |
| 1739 | ferr(po, "lea from const?\n"); |
| 1740 | |
| 1741 | printf_number(tmp1, sizeof(tmp1), popr->val); |
| 1742 | if (popr->val == 0 && strchr(cast, '*')) |
| 1743 | snprintf(buf, buf_size, "NULL"); |
| 1744 | else |
| 1745 | snprintf(buf, buf_size, "%s%s", |
| 1746 | simplify_cast_num(cast, popr->val), tmp1); |
| 1747 | break; |
| 1748 | |
| 1749 | default: |
| 1750 | ferr(po, "invalid src type: %d\n", popr->type); |
| 1751 | } |
| 1752 | |
| 1753 | return buf; |
| 1754 | } |
| 1755 | |
| 1756 | // note: may set is_ptr (we find that out late for ebp frame..) |
| 1757 | static char *out_dst_opr(char *buf, size_t buf_size, |
| 1758 | struct parsed_op *po, struct parsed_opr *popr) |
| 1759 | { |
| 1760 | switch (popr->type) { |
| 1761 | case OPT_REG: |
| 1762 | switch (popr->lmod) { |
| 1763 | case OPLM_DWORD: |
| 1764 | snprintf(buf, buf_size, "%s", opr_reg_p(po, popr)); |
| 1765 | break; |
| 1766 | case OPLM_WORD: |
| 1767 | // ugh.. |
| 1768 | snprintf(buf, buf_size, "LOWORD(%s)", opr_reg_p(po, popr)); |
| 1769 | break; |
| 1770 | case OPLM_BYTE: |
| 1771 | // ugh.. |
| 1772 | if (popr->name[1] == 'h') // XXX.. |
| 1773 | snprintf(buf, buf_size, "BYTE1(%s)", opr_reg_p(po, popr)); |
| 1774 | else |
| 1775 | snprintf(buf, buf_size, "LOBYTE(%s)", opr_reg_p(po, popr)); |
| 1776 | break; |
| 1777 | default: |
| 1778 | ferr(po, "invalid dst lmod: %d\n", popr->lmod); |
| 1779 | } |
| 1780 | break; |
| 1781 | |
| 1782 | case OPT_REGMEM: |
| 1783 | if (is_stack_access(po, popr)) { |
| 1784 | stack_frame_access(po, popr, buf, buf_size, |
| 1785 | popr->name, "", 0, 0); |
| 1786 | break; |
| 1787 | } |
| 1788 | |
| 1789 | return out_src_opr(buf, buf_size, po, popr, NULL, 0); |
| 1790 | |
| 1791 | case OPT_LABEL: |
| 1792 | if (popr->size_mismatch) |
| 1793 | snprintf(buf, buf_size, "%s%s%s", |
| 1794 | lmod_cast_u_ptr(po, popr->lmod), |
| 1795 | popr->is_array ? "" : "&", popr->name); |
| 1796 | else |
| 1797 | snprintf(buf, buf_size, "%s%s", popr->name, |
| 1798 | popr->is_array ? "[0]" : ""); |
| 1799 | break; |
| 1800 | |
| 1801 | default: |
| 1802 | ferr(po, "invalid dst type: %d\n", popr->type); |
| 1803 | } |
| 1804 | |
| 1805 | return buf; |
| 1806 | } |
| 1807 | |
| 1808 | static char *out_src_opr_u32(char *buf, size_t buf_size, |
| 1809 | struct parsed_op *po, struct parsed_opr *popr) |
| 1810 | { |
| 1811 | return out_src_opr(buf, buf_size, po, popr, NULL, 0); |
| 1812 | } |
| 1813 | |
| 1814 | static void out_test_for_cc(char *buf, size_t buf_size, |
| 1815 | struct parsed_op *po, enum parsed_flag_op pfo, int is_inv, |
| 1816 | enum opr_lenmod lmod, const char *expr) |
| 1817 | { |
| 1818 | const char *cast, *scast; |
| 1819 | |
| 1820 | cast = lmod_cast_u(po, lmod); |
| 1821 | scast = lmod_cast_s(po, lmod); |
| 1822 | |
| 1823 | switch (pfo) { |
| 1824 | case PFO_Z: |
| 1825 | case PFO_BE: // CF=1||ZF=1; CF=0 |
| 1826 | snprintf(buf, buf_size, "(%s%s %s 0)", |
| 1827 | cast, expr, is_inv ? "!=" : "=="); |
| 1828 | break; |
| 1829 | |
| 1830 | case PFO_S: |
| 1831 | case PFO_L: // SF!=OF; OF=0 |
| 1832 | snprintf(buf, buf_size, "(%s%s %s 0)", |
| 1833 | scast, expr, is_inv ? ">=" : "<"); |
| 1834 | break; |
| 1835 | |
| 1836 | case PFO_LE: // ZF=1||SF!=OF; OF=0 |
| 1837 | snprintf(buf, buf_size, "(%s%s %s 0)", |
| 1838 | scast, expr, is_inv ? ">" : "<="); |
| 1839 | break; |
| 1840 | |
| 1841 | default: |
| 1842 | ferr(po, "%s: unhandled parsed_flag_op: %d\n", __func__, pfo); |
| 1843 | } |
| 1844 | } |
| 1845 | |
| 1846 | static void out_cmp_for_cc(char *buf, size_t buf_size, |
| 1847 | struct parsed_op *po, enum parsed_flag_op pfo, int is_inv) |
| 1848 | { |
| 1849 | const char *cast, *scast, *cast_use; |
| 1850 | char buf1[256], buf2[256]; |
| 1851 | enum opr_lenmod lmod; |
| 1852 | |
| 1853 | if (po->operand[0].lmod != po->operand[1].lmod) |
| 1854 | ferr(po, "%s: lmod mismatch: %d %d\n", __func__, |
| 1855 | po->operand[0].lmod, po->operand[1].lmod); |
| 1856 | lmod = po->operand[0].lmod; |
| 1857 | |
| 1858 | cast = lmod_cast_u(po, lmod); |
| 1859 | scast = lmod_cast_s(po, lmod); |
| 1860 | |
| 1861 | switch (pfo) { |
| 1862 | case PFO_C: |
| 1863 | case PFO_Z: |
| 1864 | case PFO_BE: // !a |
| 1865 | cast_use = cast; |
| 1866 | break; |
| 1867 | |
| 1868 | case PFO_S: |
| 1869 | case PFO_L: // !ge |
| 1870 | case PFO_LE: |
| 1871 | cast_use = scast; |
| 1872 | break; |
| 1873 | |
| 1874 | default: |
| 1875 | ferr(po, "%s: unhandled parsed_flag_op: %d\n", __func__, pfo); |
| 1876 | } |
| 1877 | |
| 1878 | out_src_opr(buf1, sizeof(buf1), po, &po->operand[0], cast_use, 0); |
| 1879 | out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], cast_use, 0); |
| 1880 | |
| 1881 | switch (pfo) { |
| 1882 | case PFO_C: |
| 1883 | // note: must be unsigned compare |
| 1884 | snprintf(buf, buf_size, "(%s %s %s)", |
| 1885 | buf1, is_inv ? ">=" : "<", buf2); |
| 1886 | break; |
| 1887 | |
| 1888 | case PFO_Z: |
| 1889 | snprintf(buf, buf_size, "(%s %s %s)", |
| 1890 | buf1, is_inv ? "!=" : "==", buf2); |
| 1891 | break; |
| 1892 | |
| 1893 | case PFO_BE: // !a |
| 1894 | // note: must be unsigned compare |
| 1895 | snprintf(buf, buf_size, "(%s %s %s)", |
| 1896 | buf1, is_inv ? ">" : "<=", buf2); |
| 1897 | |
| 1898 | // annoying case |
| 1899 | if (is_inv && lmod == OPLM_BYTE |
| 1900 | && po->operand[1].type == OPT_CONST |
| 1901 | && po->operand[1].val == 0xff) |
| 1902 | { |
| 1903 | snprintf(g_comment, sizeof(g_comment), "if %s", buf); |
| 1904 | snprintf(buf, buf_size, "(0)"); |
| 1905 | } |
| 1906 | break; |
| 1907 | |
| 1908 | // note: must be signed compare |
| 1909 | case PFO_S: |
| 1910 | snprintf(buf, buf_size, "(%s(%s - %s) %s 0)", |
| 1911 | scast, buf1, buf2, is_inv ? ">=" : "<"); |
| 1912 | break; |
| 1913 | |
| 1914 | case PFO_L: // !ge |
| 1915 | snprintf(buf, buf_size, "(%s %s %s)", |
| 1916 | buf1, is_inv ? ">=" : "<", buf2); |
| 1917 | break; |
| 1918 | |
| 1919 | case PFO_LE: |
| 1920 | snprintf(buf, buf_size, "(%s %s %s)", |
| 1921 | buf1, is_inv ? ">" : "<=", buf2); |
| 1922 | break; |
| 1923 | |
| 1924 | default: |
| 1925 | break; |
| 1926 | } |
| 1927 | } |
| 1928 | |
| 1929 | static void out_cmp_test(char *buf, size_t buf_size, |
| 1930 | struct parsed_op *po, enum parsed_flag_op pfo, int is_inv) |
| 1931 | { |
| 1932 | char buf1[256], buf2[256], buf3[256]; |
| 1933 | |
| 1934 | if (po->op == OP_TEST) { |
| 1935 | if (IS(opr_name(po, 0), opr_name(po, 1))) { |
| 1936 | out_src_opr_u32(buf3, sizeof(buf3), po, &po->operand[0]); |
| 1937 | } |
| 1938 | else { |
| 1939 | out_src_opr_u32(buf1, sizeof(buf1), po, &po->operand[0]); |
| 1940 | out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1]); |
| 1941 | snprintf(buf3, sizeof(buf3), "(%s & %s)", buf1, buf2); |
| 1942 | } |
| 1943 | out_test_for_cc(buf, buf_size, po, pfo, is_inv, |
| 1944 | po->operand[0].lmod, buf3); |
| 1945 | } |
| 1946 | else if (po->op == OP_CMP) { |
| 1947 | out_cmp_for_cc(buf, buf_size, po, pfo, is_inv); |
| 1948 | } |
| 1949 | else |
| 1950 | ferr(po, "%s: unhandled op: %d\n", __func__, po->op); |
| 1951 | } |
| 1952 | |
| 1953 | static void propagate_lmod(struct parsed_op *po, struct parsed_opr *popr1, |
| 1954 | struct parsed_opr *popr2) |
| 1955 | { |
| 1956 | if (popr1->lmod == OPLM_UNSPEC && popr2->lmod == OPLM_UNSPEC) |
| 1957 | ferr(po, "missing lmod for both operands\n"); |
| 1958 | |
| 1959 | if (popr1->lmod == OPLM_UNSPEC) |
| 1960 | popr1->lmod = popr2->lmod; |
| 1961 | else if (popr2->lmod == OPLM_UNSPEC) |
| 1962 | popr2->lmod = popr1->lmod; |
| 1963 | else if (popr1->lmod != popr2->lmod) { |
| 1964 | if (popr1->type_from_var) { |
| 1965 | popr1->size_mismatch = 1; |
| 1966 | if (popr1->lmod < popr2->lmod) |
| 1967 | popr1->size_lt = 1; |
| 1968 | popr1->lmod = popr2->lmod; |
| 1969 | } |
| 1970 | else if (popr2->type_from_var) { |
| 1971 | popr2->size_mismatch = 1; |
| 1972 | if (popr2->lmod < popr1->lmod) |
| 1973 | popr2->size_lt = 1; |
| 1974 | popr2->lmod = popr1->lmod; |
| 1975 | } |
| 1976 | else |
| 1977 | ferr(po, "conflicting lmods: %d vs %d\n", |
| 1978 | popr1->lmod, popr2->lmod); |
| 1979 | } |
| 1980 | } |
| 1981 | |
| 1982 | static const char *op_to_c(struct parsed_op *po) |
| 1983 | { |
| 1984 | switch (po->op) |
| 1985 | { |
| 1986 | case OP_ADD: |
| 1987 | case OP_ADC: |
| 1988 | return "+"; |
| 1989 | case OP_SUB: |
| 1990 | case OP_SBB: |
| 1991 | return "-"; |
| 1992 | case OP_AND: |
| 1993 | return "&"; |
| 1994 | case OP_OR: |
| 1995 | return "|"; |
| 1996 | case OP_XOR: |
| 1997 | return "^"; |
| 1998 | case OP_SHL: |
| 1999 | return "<<"; |
| 2000 | case OP_SHR: |
| 2001 | return ">>"; |
| 2002 | case OP_MUL: |
| 2003 | case OP_IMUL: |
| 2004 | return "*"; |
| 2005 | default: |
| 2006 | ferr(po, "op_to_c was supplied with %d\n", po->op); |
| 2007 | } |
| 2008 | } |
| 2009 | |
| 2010 | static void op_set_clear_flag(struct parsed_op *po, |
| 2011 | enum op_flags flag_set, enum op_flags flag_clear) |
| 2012 | { |
| 2013 | po->flags |= flag_set; |
| 2014 | po->flags &= ~flag_clear; |
| 2015 | } |
| 2016 | |
| 2017 | // last op in stream - unconditional branch or ret |
| 2018 | #define LAST_OP(_i) ((ops[_i].flags & OPF_TAIL) \ |
| 2019 | || ((ops[_i].flags & (OPF_JMP|OPF_CJMP|OPF_RMD)) == OPF_JMP \ |
| 2020 | && ops[_i].op != OP_CALL)) |
| 2021 | |
| 2022 | static int scan_for_pop(int i, int opcnt, const char *reg, |
| 2023 | int magic, int depth, int *maxdepth, int do_flags) |
| 2024 | { |
| 2025 | const struct parsed_proto *pp; |
| 2026 | struct parsed_op *po; |
| 2027 | int ret = 0; |
| 2028 | int j; |
| 2029 | |
| 2030 | for (; i < opcnt; i++) { |
| 2031 | po = &ops[i]; |
| 2032 | if (po->cc_scratch == magic) |
| 2033 | break; // already checked |
| 2034 | po->cc_scratch = magic; |
| 2035 | |
| 2036 | if (po->flags & OPF_TAIL) { |
| 2037 | if (po->op == OP_CALL) { |
| 2038 | pp = proto_parse(g_fhdr, po->operand[0].name, 0); |
| 2039 | if (pp != NULL && pp->is_noreturn) |
| 2040 | // no stack cleanup for noreturn |
| 2041 | return ret; |
| 2042 | } |
| 2043 | return -1; // deadend |
| 2044 | } |
| 2045 | |
| 2046 | if ((po->flags & OPF_RMD) |
| 2047 | || (po->op == OP_PUSH && po->p_argnum != 0)) // arg push |
| 2048 | continue; |
| 2049 | |
| 2050 | if ((po->flags & OPF_JMP) && po->op != OP_CALL) { |
| 2051 | if (po->btj != NULL) { |
| 2052 | // jumptable |
| 2053 | for (j = 0; j < po->btj->count; j++) { |
| 2054 | ret |= scan_for_pop(po->btj->d[j].bt_i, opcnt, reg, magic, |
| 2055 | depth, maxdepth, do_flags); |
| 2056 | if (ret < 0) |
| 2057 | return ret; // dead end |
| 2058 | } |
| 2059 | return ret; |
| 2060 | } |
| 2061 | |
| 2062 | if (po->bt_i < 0) { |
| 2063 | ferr(po, "dead branch\n"); |
| 2064 | return -1; |
| 2065 | } |
| 2066 | |
| 2067 | if (po->flags & OPF_CJMP) { |
| 2068 | ret |= scan_for_pop(po->bt_i, opcnt, reg, magic, |
| 2069 | depth, maxdepth, do_flags); |
| 2070 | if (ret < 0) |
| 2071 | return ret; // dead end |
| 2072 | } |
| 2073 | else { |
| 2074 | i = po->bt_i - 1; |
| 2075 | } |
| 2076 | continue; |
| 2077 | } |
| 2078 | |
| 2079 | if ((po->op == OP_POP || po->op == OP_PUSH) |
| 2080 | && po->operand[0].type == OPT_REG |
| 2081 | && IS(po->operand[0].name, reg)) |
| 2082 | { |
| 2083 | if (po->op == OP_PUSH && !(po->flags & OPF_FARG)) { |
| 2084 | depth++; |
| 2085 | if (depth > *maxdepth) |
| 2086 | *maxdepth = depth; |
| 2087 | if (do_flags) |
| 2088 | op_set_clear_flag(po, OPF_RSAVE, OPF_RMD); |
| 2089 | } |
| 2090 | else if (po->op == OP_POP) { |
| 2091 | if (depth == 0) { |
| 2092 | if (do_flags) |
| 2093 | op_set_clear_flag(po, OPF_RMD, OPF_RSAVE); |
| 2094 | return 1; |
| 2095 | } |
| 2096 | else { |
| 2097 | depth--; |
| 2098 | if (depth < 0) // should not happen |
| 2099 | ferr(po, "fail with depth\n"); |
| 2100 | if (do_flags) |
| 2101 | op_set_clear_flag(po, OPF_RSAVE, OPF_RMD); |
| 2102 | } |
| 2103 | } |
| 2104 | } |
| 2105 | } |
| 2106 | |
| 2107 | return ret; |
| 2108 | } |
| 2109 | |
| 2110 | // scan for pop starting from 'ret' op (all paths) |
| 2111 | static int scan_for_pop_ret(int i, int opcnt, const char *reg, |
| 2112 | int flag_set) |
| 2113 | { |
| 2114 | int found = 0; |
| 2115 | int j; |
| 2116 | |
| 2117 | for (; i < opcnt; i++) { |
| 2118 | if (!(ops[i].flags & OPF_TAIL)) |
| 2119 | continue; |
| 2120 | |
| 2121 | for (j = i - 1; j >= 0; j--) { |
| 2122 | if (ops[j].flags & OPF_RMD) |
| 2123 | continue; |
| 2124 | if (ops[j].flags & OPF_JMP) |
| 2125 | return -1; |
| 2126 | |
| 2127 | if (ops[j].op == OP_POP && ops[j].operand[0].type == OPT_REG |
| 2128 | && IS(ops[j].operand[0].name, reg)) |
| 2129 | { |
| 2130 | found = 1; |
| 2131 | ops[j].flags |= flag_set; |
| 2132 | break; |
| 2133 | } |
| 2134 | |
| 2135 | if (g_labels[j][0] != 0) |
| 2136 | return -1; |
| 2137 | } |
| 2138 | } |
| 2139 | |
| 2140 | return found ? 0 : -1; |
| 2141 | } |
| 2142 | |
| 2143 | static void scan_propagate_df(int i, int opcnt) |
| 2144 | { |
| 2145 | struct parsed_op *po = &ops[i]; |
| 2146 | int j; |
| 2147 | |
| 2148 | for (; i < opcnt; i++) { |
| 2149 | po = &ops[i]; |
| 2150 | if (po->flags & OPF_DF) |
| 2151 | return; // already resolved |
| 2152 | po->flags |= OPF_DF; |
| 2153 | |
| 2154 | if (po->op == OP_CALL) |
| 2155 | ferr(po, "call with DF set?\n"); |
| 2156 | |
| 2157 | if (po->flags & OPF_JMP) { |
| 2158 | if (po->btj != NULL) { |
| 2159 | // jumptable |
| 2160 | for (j = 0; j < po->btj->count; j++) |
| 2161 | scan_propagate_df(po->btj->d[j].bt_i, opcnt); |
| 2162 | return; |
| 2163 | } |
| 2164 | |
| 2165 | if (po->bt_i < 0) { |
| 2166 | ferr(po, "dead branch\n"); |
| 2167 | return; |
| 2168 | } |
| 2169 | |
| 2170 | if (po->flags & OPF_CJMP) |
| 2171 | scan_propagate_df(po->bt_i, opcnt); |
| 2172 | else |
| 2173 | i = po->bt_i - 1; |
| 2174 | continue; |
| 2175 | } |
| 2176 | |
| 2177 | if (po->flags & OPF_TAIL) |
| 2178 | break; |
| 2179 | |
| 2180 | if (po->op == OP_CLD) { |
| 2181 | po->flags |= OPF_RMD; |
| 2182 | return; |
| 2183 | } |
| 2184 | } |
| 2185 | |
| 2186 | ferr(po, "missing DF clear?\n"); |
| 2187 | } |
| 2188 | |
| 2189 | // is operand 'opr' modified by parsed_op 'po'? |
| 2190 | static int is_opr_modified(const struct parsed_opr *opr, |
| 2191 | const struct parsed_op *po) |
| 2192 | { |
| 2193 | int mask; |
| 2194 | |
| 2195 | if ((po->flags & OPF_RMD) || !(po->flags & OPF_DATA)) |
| 2196 | return 0; |
| 2197 | |
| 2198 | if (opr->type == OPT_REG) { |
| 2199 | if (po->op == OP_CALL) { |
| 2200 | mask = (1 << xAX) | (1 << xCX) | (1 << xDX); |
| 2201 | if ((1 << opr->reg) & mask) |
| 2202 | return 1; |
| 2203 | else |
| 2204 | return 0; |
| 2205 | } |
| 2206 | |
| 2207 | if (po->operand[0].type == OPT_REG) { |
| 2208 | if (po->regmask_dst & (1 << opr->reg)) |
| 2209 | return 1; |
| 2210 | else |
| 2211 | return 0; |
| 2212 | } |
| 2213 | } |
| 2214 | |
| 2215 | return IS(po->operand[0].name, opr->name); |
| 2216 | } |
| 2217 | |
| 2218 | // is any operand of parsed_op 'po_test' modified by parsed_op 'po'? |
| 2219 | static int is_any_opr_modified(const struct parsed_op *po_test, |
| 2220 | const struct parsed_op *po, int c_mode) |
| 2221 | { |
| 2222 | int mask; |
| 2223 | int i; |
| 2224 | |
| 2225 | if ((po->flags & OPF_RMD) || !(po->flags & OPF_DATA)) |
| 2226 | return 0; |
| 2227 | |
| 2228 | if (po_test->operand_cnt == 1 && po_test->operand[0].type == OPT_CONST) |
| 2229 | return 0; |
| 2230 | |
| 2231 | if ((po_test->regmask_src | po_test->regmask_dst) & po->regmask_dst) |
| 2232 | return 1; |
| 2233 | |
| 2234 | // in reality, it can wreck any register, but in decompiled C |
| 2235 | // version it can only overwrite eax or edx:eax |
| 2236 | mask = (1 << xAX) | (1 << xDX); |
| 2237 | if (!c_mode) |
| 2238 | mask |= 1 << xCX; |
| 2239 | |
| 2240 | if (po->op == OP_CALL |
| 2241 | && ((po_test->regmask_src | po_test->regmask_dst) & mask)) |
| 2242 | return 1; |
| 2243 | |
| 2244 | for (i = 0; i < po_test->operand_cnt; i++) |
| 2245 | if (IS(po_test->operand[i].name, po->operand[0].name)) |
| 2246 | return 1; |
| 2247 | |
| 2248 | return 0; |
| 2249 | } |
| 2250 | |
| 2251 | // scan for any po_test operand modification in range given |
| 2252 | static int scan_for_mod(struct parsed_op *po_test, int i, int opcnt, |
| 2253 | int c_mode) |
| 2254 | { |
| 2255 | if (po_test->operand_cnt == 1 && po_test->operand[0].type == OPT_CONST) |
| 2256 | return -1; |
| 2257 | |
| 2258 | for (; i < opcnt; i++) { |
| 2259 | if (is_any_opr_modified(po_test, &ops[i], c_mode)) |
| 2260 | return i; |
| 2261 | } |
| 2262 | |
| 2263 | return -1; |
| 2264 | } |
| 2265 | |
| 2266 | // scan for po_test operand[0] modification in range given |
| 2267 | static int scan_for_mod_opr0(struct parsed_op *po_test, |
| 2268 | int i, int opcnt) |
| 2269 | { |
| 2270 | for (; i < opcnt; i++) { |
| 2271 | if (is_opr_modified(&po_test->operand[0], &ops[i])) |
| 2272 | return i; |
| 2273 | } |
| 2274 | |
| 2275 | return -1; |
| 2276 | } |
| 2277 | |
| 2278 | static int scan_for_flag_set(int i, int magic, int *branched, |
| 2279 | int *setters, int *setter_cnt) |
| 2280 | { |
| 2281 | struct label_ref *lr; |
| 2282 | int ret; |
| 2283 | |
| 2284 | while (i >= 0) { |
| 2285 | if (ops[i].cc_scratch == magic) { |
| 2286 | ferr(&ops[i], "%s looped\n", __func__); |
| 2287 | return -1; |
| 2288 | } |
| 2289 | ops[i].cc_scratch = magic; |
| 2290 | |
| 2291 | if (g_labels[i][0] != 0) { |
| 2292 | *branched = 1; |
| 2293 | |
| 2294 | lr = &g_label_refs[i]; |
| 2295 | for (; lr->next; lr = lr->next) { |
| 2296 | ret = scan_for_flag_set(lr->i, magic, |
| 2297 | branched, setters, setter_cnt); |
| 2298 | if (ret < 0) |
| 2299 | return ret; |
| 2300 | } |
| 2301 | |
| 2302 | if (i > 0 && LAST_OP(i - 1)) { |
| 2303 | i = lr->i; |
| 2304 | continue; |
| 2305 | } |
| 2306 | ret = scan_for_flag_set(lr->i, magic, |
| 2307 | branched, setters, setter_cnt); |
| 2308 | if (ret < 0) |
| 2309 | return ret; |
| 2310 | } |
| 2311 | i--; |
| 2312 | |
| 2313 | if (ops[i].flags & OPF_FLAGS) { |
| 2314 | setters[*setter_cnt] = i; |
| 2315 | (*setter_cnt)++; |
| 2316 | return 0; |
| 2317 | } |
| 2318 | |
| 2319 | if ((ops[i].flags & (OPF_JMP|OPF_CJMP)) == OPF_JMP) |
| 2320 | return -1; |
| 2321 | } |
| 2322 | |
| 2323 | return -1; |
| 2324 | } |
| 2325 | |
| 2326 | // scan back for cdq, if anything modifies edx, fail |
| 2327 | static int scan_for_cdq_edx(int i) |
| 2328 | { |
| 2329 | while (i >= 0) { |
| 2330 | if (g_labels[i][0] != 0) { |
| 2331 | if (g_label_refs[i].next != NULL) |
| 2332 | return -1; |
| 2333 | if (i > 0 && LAST_OP(i - 1)) { |
| 2334 | i = g_label_refs[i].i; |
| 2335 | continue; |
| 2336 | } |
| 2337 | return -1; |
| 2338 | } |
| 2339 | i--; |
| 2340 | |
| 2341 | if (ops[i].op == OP_CDQ) |
| 2342 | return i; |
| 2343 | |
| 2344 | if (ops[i].regmask_dst & (1 << xDX)) |
| 2345 | return -1; |
| 2346 | } |
| 2347 | |
| 2348 | return -1; |
| 2349 | } |
| 2350 | |
| 2351 | static int scan_for_reg_clear(int i, int reg) |
| 2352 | { |
| 2353 | while (i >= 0) { |
| 2354 | if (g_labels[i][0] != 0) { |
| 2355 | if (g_label_refs[i].next != NULL) |
| 2356 | return -1; |
| 2357 | if (i > 0 && LAST_OP(i - 1)) { |
| 2358 | i = g_label_refs[i].i; |
| 2359 | continue; |
| 2360 | } |
| 2361 | return -1; |
| 2362 | } |
| 2363 | i--; |
| 2364 | |
| 2365 | if (ops[i].op == OP_XOR |
| 2366 | && ops[i].operand[0].lmod == OPLM_DWORD |
| 2367 | && ops[i].operand[0].reg == ops[i].operand[1].reg |
| 2368 | && ops[i].operand[0].reg == reg) |
| 2369 | return i; |
| 2370 | |
| 2371 | if (ops[i].regmask_dst & (1 << reg)) |
| 2372 | return -1; |
| 2373 | } |
| 2374 | |
| 2375 | return -1; |
| 2376 | } |
| 2377 | |
| 2378 | // scan for positive, constant esp adjust |
| 2379 | static int scan_for_esp_adjust(int i, int opcnt, int *adj, |
| 2380 | int *multipath) |
| 2381 | { |
| 2382 | struct parsed_op *po; |
| 2383 | int first_pop = -1; |
| 2384 | |
| 2385 | *adj = *multipath = 0; |
| 2386 | |
| 2387 | for (; i < opcnt; i++) { |
| 2388 | po = &ops[i]; |
| 2389 | |
| 2390 | if (g_labels[i][0] != 0) |
| 2391 | *multipath = 1; |
| 2392 | |
| 2393 | if (po->op == OP_ADD && po->operand[0].reg == xSP) { |
| 2394 | if (po->operand[1].type != OPT_CONST) |
| 2395 | ferr(&ops[i], "non-const esp adjust?\n"); |
| 2396 | *adj += po->operand[1].val; |
| 2397 | if (*adj & 3) |
| 2398 | ferr(&ops[i], "unaligned esp adjust: %x\n", *adj); |
| 2399 | return i; |
| 2400 | } |
| 2401 | else if (po->op == OP_PUSH && !(po->flags & OPF_RMD)) { |
| 2402 | //if (first_pop == -1) |
| 2403 | // first_pop = -2; // none |
| 2404 | *adj -= lmod_bytes(po, po->operand[0].lmod); |
| 2405 | } |
| 2406 | else if (po->op == OP_POP && !(po->flags & OPF_RMD)) { |
| 2407 | // seems like msvc only uses 'pop ecx' for stack realignment.. |
| 2408 | if (po->operand[0].type != OPT_REG || po->operand[0].reg != xCX) |
| 2409 | break; |
| 2410 | if (first_pop == -1 && *adj >= 0) |
| 2411 | first_pop = i; |
| 2412 | *adj += lmod_bytes(po, po->operand[0].lmod); |
| 2413 | } |
| 2414 | else if (po->flags & (OPF_JMP|OPF_TAIL)) { |
| 2415 | if (po->op == OP_JMP && po->btj == NULL) { |
| 2416 | i = po->bt_i - 1; |
| 2417 | continue; |
| 2418 | } |
| 2419 | if (po->op != OP_CALL) |
| 2420 | break; |
| 2421 | if (po->operand[0].type != OPT_LABEL) |
| 2422 | break; |
| 2423 | if (po->pp != NULL && po->pp->is_stdcall) |
| 2424 | break; |
| 2425 | } |
| 2426 | } |
| 2427 | |
| 2428 | if (first_pop >= 0) { |
| 2429 | // probably 'pop ecx' was used.. |
| 2430 | return first_pop; |
| 2431 | } |
| 2432 | |
| 2433 | return -1; |
| 2434 | } |
| 2435 | |
| 2436 | static void scan_fwd_set_flags(int i, int opcnt, int magic, int flags) |
| 2437 | { |
| 2438 | struct parsed_op *po; |
| 2439 | int j; |
| 2440 | |
| 2441 | if (i < 0) |
| 2442 | ferr(ops, "%s: followed bad branch?\n", __func__); |
| 2443 | |
| 2444 | for (; i < opcnt; i++) { |
| 2445 | po = &ops[i]; |
| 2446 | if (po->cc_scratch == magic) |
| 2447 | return; |
| 2448 | po->cc_scratch = magic; |
| 2449 | po->flags |= flags; |
| 2450 | |
| 2451 | if ((po->flags & OPF_JMP) && po->op != OP_CALL) { |
| 2452 | if (po->btj != NULL) { |
| 2453 | // jumptable |
| 2454 | for (j = 0; j < po->btj->count; j++) |
| 2455 | scan_fwd_set_flags(po->btj->d[j].bt_i, opcnt, magic, flags); |
| 2456 | return; |
| 2457 | } |
| 2458 | |
| 2459 | scan_fwd_set_flags(po->bt_i, opcnt, magic, flags); |
| 2460 | if (!(po->flags & OPF_CJMP)) |
| 2461 | return; |
| 2462 | } |
| 2463 | if (po->flags & OPF_TAIL) |
| 2464 | return; |
| 2465 | } |
| 2466 | } |
| 2467 | |
| 2468 | static const struct parsed_proto *try_recover_pp( |
| 2469 | struct parsed_op *po, const struct parsed_opr *opr, int *search_instead) |
| 2470 | { |
| 2471 | const struct parsed_proto *pp = NULL; |
| 2472 | char buf[256]; |
| 2473 | char *p; |
| 2474 | |
| 2475 | // maybe an arg of g_func? |
| 2476 | if (opr->type == OPT_REGMEM && is_stack_access(po, opr)) |
| 2477 | { |
| 2478 | char ofs_reg[16] = { 0, }; |
| 2479 | int arg, arg_s, arg_i; |
| 2480 | int stack_ra = 0; |
| 2481 | int offset = 0; |
| 2482 | |
| 2483 | parse_stack_access(po, opr->name, ofs_reg, |
| 2484 | &offset, &stack_ra, NULL, 0); |
| 2485 | if (ofs_reg[0] != 0) |
| 2486 | ferr(po, "offset reg on arg access?\n"); |
| 2487 | if (offset <= stack_ra) { |
| 2488 | // search who set the stack var instead |
| 2489 | if (search_instead != NULL) |
| 2490 | *search_instead = 1; |
| 2491 | return NULL; |
| 2492 | } |
| 2493 | |
| 2494 | arg_i = (offset - stack_ra - 4) / 4; |
| 2495 | for (arg = arg_s = 0; arg < g_func_pp->argc; arg++) { |
| 2496 | if (g_func_pp->arg[arg].reg != NULL) |
| 2497 | continue; |
| 2498 | if (arg_s == arg_i) |
| 2499 | break; |
| 2500 | arg_s++; |
| 2501 | } |
| 2502 | if (arg == g_func_pp->argc) |
| 2503 | ferr(po, "stack arg %d not in prototype?\n", arg_i); |
| 2504 | |
| 2505 | pp = g_func_pp->arg[arg].fptr; |
| 2506 | if (pp == NULL) |
| 2507 | ferr(po, "icall sa: arg%d is not a fptr?\n", arg + 1); |
| 2508 | check_func_pp(po, pp, "icall arg"); |
| 2509 | } |
| 2510 | else if (opr->type == OPT_REGMEM && strchr(opr->name + 1, '[')) { |
| 2511 | // label[index] |
| 2512 | p = strchr(opr->name + 1, '['); |
| 2513 | memcpy(buf, opr->name, p - opr->name); |
| 2514 | buf[p - opr->name] = 0; |
| 2515 | pp = proto_parse(g_fhdr, buf, 0); |
| 2516 | } |
| 2517 | else if (opr->type == OPT_OFFSET || opr->type == OPT_LABEL) { |
| 2518 | pp = proto_parse(g_fhdr, opr->name, 0); |
| 2519 | if (pp == NULL) |
| 2520 | ferr(po, "proto_parse failed for icall from '%s'\n", opr->name); |
| 2521 | check_func_pp(po, pp, "reg-fptr ref"); |
| 2522 | } |
| 2523 | |
| 2524 | return pp; |
| 2525 | } |
| 2526 | |
| 2527 | static void scan_for_call_type(int i, const struct parsed_opr *opr, |
| 2528 | int magic, const struct parsed_proto **pp_found, int *multi) |
| 2529 | { |
| 2530 | const struct parsed_proto *pp = NULL; |
| 2531 | struct parsed_op *po; |
| 2532 | struct label_ref *lr; |
| 2533 | |
| 2534 | ops[i].cc_scratch = magic; |
| 2535 | |
| 2536 | while (1) { |
| 2537 | if (g_labels[i][0] != 0) { |
| 2538 | lr = &g_label_refs[i]; |
| 2539 | for (; lr != NULL; lr = lr->next) |
| 2540 | scan_for_call_type(lr->i, opr, magic, pp_found, multi); |
| 2541 | if (i > 0 && LAST_OP(i - 1)) |
| 2542 | return; |
| 2543 | } |
| 2544 | |
| 2545 | i--; |
| 2546 | if (i < 0) |
| 2547 | break; |
| 2548 | |
| 2549 | if (ops[i].cc_scratch == magic) |
| 2550 | return; |
| 2551 | ops[i].cc_scratch = magic; |
| 2552 | |
| 2553 | if (!(ops[i].flags & OPF_DATA)) |
| 2554 | continue; |
| 2555 | if (!is_opr_modified(opr, &ops[i])) |
| 2556 | continue; |
| 2557 | if (ops[i].op != OP_MOV && ops[i].op != OP_LEA) { |
| 2558 | // most probably trashed by some processing |
| 2559 | *pp_found = NULL; |
| 2560 | return; |
| 2561 | } |
| 2562 | |
| 2563 | opr = &ops[i].operand[1]; |
| 2564 | if (opr->type != OPT_REG) |
| 2565 | break; |
| 2566 | } |
| 2567 | |
| 2568 | po = (i >= 0) ? &ops[i] : ops; |
| 2569 | |
| 2570 | if (i < 0) { |
| 2571 | // reached the top - can only be an arg-reg |
| 2572 | if (opr->type != OPT_REG) |
| 2573 | return; |
| 2574 | |
| 2575 | for (i = 0; i < g_func_pp->argc; i++) { |
| 2576 | if (g_func_pp->arg[i].reg == NULL) |
| 2577 | continue; |
| 2578 | if (IS(opr->name, g_func_pp->arg[i].reg)) |
| 2579 | break; |
| 2580 | } |
| 2581 | if (i == g_func_pp->argc) |
| 2582 | return; |
| 2583 | pp = g_func_pp->arg[i].fptr; |
| 2584 | if (pp == NULL) |
| 2585 | ferr(po, "icall: arg%d (%s) is not a fptr?\n", |
| 2586 | i + 1, g_func_pp->arg[i].reg); |
| 2587 | check_func_pp(po, pp, "icall reg-arg"); |
| 2588 | } |
| 2589 | else |
| 2590 | pp = try_recover_pp(po, opr, NULL); |
| 2591 | |
| 2592 | if (*pp_found != NULL && pp != NULL && *pp_found != pp) { |
| 2593 | if (!IS((*pp_found)->ret_type.name, pp->ret_type.name) |
| 2594 | || (*pp_found)->is_stdcall != pp->is_stdcall |
| 2595 | || (*pp_found)->is_fptr != pp->is_fptr |
| 2596 | || (*pp_found)->argc != pp->argc |
| 2597 | || (*pp_found)->argc_reg != pp->argc_reg |
| 2598 | || (*pp_found)->argc_stack != pp->argc_stack) |
| 2599 | { |
| 2600 | ferr(po, "icall: parsed_proto mismatch\n"); |
| 2601 | } |
| 2602 | *multi = 1; |
| 2603 | } |
| 2604 | if (pp != NULL) |
| 2605 | *pp_found = pp; |
| 2606 | } |
| 2607 | |
| 2608 | static const struct parsed_proto *resolve_icall(int i, int opcnt, |
| 2609 | int *multi_src) |
| 2610 | { |
| 2611 | const struct parsed_proto *pp = NULL; |
| 2612 | int search_advice = 0; |
| 2613 | |
| 2614 | *multi_src = 0; |
| 2615 | |
| 2616 | switch (ops[i].operand[0].type) { |
| 2617 | case OPT_REGMEM: |
| 2618 | case OPT_LABEL: |
| 2619 | case OPT_OFFSET: |
| 2620 | pp = try_recover_pp(&ops[i], &ops[i].operand[0], &search_advice); |
| 2621 | if (!search_advice) |
| 2622 | break; |
| 2623 | // fallthrough |
| 2624 | default: |
| 2625 | scan_for_call_type(i, &ops[i].operand[0], i + opcnt * 9, &pp, |
| 2626 | multi_src); |
| 2627 | break; |
| 2628 | } |
| 2629 | |
| 2630 | return pp; |
| 2631 | } |
| 2632 | |
| 2633 | // find an instruction that changed opr before i op |
| 2634 | // *op_i must be set to -1 |
| 2635 | static int resolve_origin(int i, const struct parsed_opr *opr, |
| 2636 | int magic, int *op_i) |
| 2637 | { |
| 2638 | struct label_ref *lr; |
| 2639 | int ret = 0; |
| 2640 | |
| 2641 | ops[i].cc_scratch = magic; |
| 2642 | |
| 2643 | while (1) { |
| 2644 | if (g_labels[i][0] != 0) { |
| 2645 | lr = &g_label_refs[i]; |
| 2646 | for (; lr != NULL; lr = lr->next) |
| 2647 | ret |= resolve_origin(lr->i, opr, magic, op_i); |
| 2648 | if (i > 0 && LAST_OP(i - 1)) |
| 2649 | return ret; |
| 2650 | } |
| 2651 | |
| 2652 | i--; |
| 2653 | if (i < 0) |
| 2654 | return -1; |
| 2655 | |
| 2656 | if (ops[i].cc_scratch == magic) |
| 2657 | return 0; |
| 2658 | ops[i].cc_scratch = magic; |
| 2659 | |
| 2660 | if (!(ops[i].flags & OPF_DATA)) |
| 2661 | continue; |
| 2662 | if (!is_opr_modified(opr, &ops[i])) |
| 2663 | continue; |
| 2664 | |
| 2665 | if (*op_i >= 0) { |
| 2666 | if (*op_i == i) |
| 2667 | return 1; |
| 2668 | // XXX: could check if the other op does the same |
| 2669 | return -1; |
| 2670 | } |
| 2671 | |
| 2672 | *op_i = i; |
| 2673 | return 1; |
| 2674 | } |
| 2675 | } |
| 2676 | |
| 2677 | static int try_resolve_const(int i, const struct parsed_opr *opr, |
| 2678 | int magic, unsigned int *val) |
| 2679 | { |
| 2680 | int s_i = -1; |
| 2681 | int ret = 0; |
| 2682 | |
| 2683 | ret = resolve_origin(i, opr, magic, &s_i); |
| 2684 | if (ret == 1) { |
| 2685 | i = s_i; |
| 2686 | if (ops[i].op != OP_MOV && ops[i].operand[1].type != OPT_CONST) |
| 2687 | return -1; |
| 2688 | |
| 2689 | *val = ops[i].operand[1].val; |
| 2690 | return 1; |
| 2691 | } |
| 2692 | |
| 2693 | return -1; |
| 2694 | } |
| 2695 | |
| 2696 | static int collect_call_args_r(struct parsed_op *po, int i, |
| 2697 | struct parsed_proto *pp, int *regmask, int *save_arg_vars, int arg, |
| 2698 | int magic, int need_op_saving, int may_reuse) |
| 2699 | { |
| 2700 | struct parsed_proto *pp_tmp; |
| 2701 | struct label_ref *lr; |
| 2702 | int need_to_save_current; |
| 2703 | int save_args; |
| 2704 | int ret = 0; |
| 2705 | int reg; |
| 2706 | char buf[32]; |
| 2707 | int j, k; |
| 2708 | |
| 2709 | if (i < 0) { |
| 2710 | ferr(po, "dead label encountered\n"); |
| 2711 | return -1; |
| 2712 | } |
| 2713 | |
| 2714 | for (; arg < pp->argc; arg++) |
| 2715 | if (pp->arg[arg].reg == NULL) |
| 2716 | break; |
| 2717 | magic = (magic & 0xffffff) | (arg << 24); |
| 2718 | |
| 2719 | for (j = i; j >= 0 && (arg < pp->argc || pp->is_unresolved); ) |
| 2720 | { |
| 2721 | if (((ops[j].cc_scratch ^ magic) & 0xffffff) == 0) { |
| 2722 | if (ops[j].cc_scratch != magic) { |
| 2723 | ferr(&ops[j], "arg collect hit same path with diff args for %s\n", |
| 2724 | pp->name); |
| 2725 | return -1; |
| 2726 | } |
| 2727 | // ok: have already been here |
| 2728 | return 0; |
| 2729 | } |
| 2730 | ops[j].cc_scratch = magic; |
| 2731 | |
| 2732 | if (g_labels[j][0] != 0 && g_label_refs[j].i != -1) { |
| 2733 | lr = &g_label_refs[j]; |
| 2734 | if (lr->next != NULL) |
| 2735 | need_op_saving = 1; |
| 2736 | for (; lr->next; lr = lr->next) { |
| 2737 | if ((ops[lr->i].flags & (OPF_JMP|OPF_CJMP)) != OPF_JMP) |
| 2738 | may_reuse = 1; |
| 2739 | ret = collect_call_args_r(po, lr->i, pp, regmask, save_arg_vars, |
| 2740 | arg, magic, need_op_saving, may_reuse); |
| 2741 | if (ret < 0) |
| 2742 | return ret; |
| 2743 | } |
| 2744 | |
| 2745 | if ((ops[lr->i].flags & (OPF_JMP|OPF_CJMP)) != OPF_JMP) |
| 2746 | may_reuse = 1; |
| 2747 | if (j > 0 && LAST_OP(j - 1)) { |
| 2748 | // follow last branch in reverse |
| 2749 | j = lr->i; |
| 2750 | continue; |
| 2751 | } |
| 2752 | need_op_saving = 1; |
| 2753 | ret = collect_call_args_r(po, lr->i, pp, regmask, save_arg_vars, |
| 2754 | arg, magic, need_op_saving, may_reuse); |
| 2755 | if (ret < 0) |
| 2756 | return ret; |
| 2757 | } |
| 2758 | j--; |
| 2759 | |
| 2760 | if (ops[j].op == OP_CALL) |
| 2761 | { |
| 2762 | if (pp->is_unresolved) |
| 2763 | break; |
| 2764 | |
| 2765 | pp_tmp = ops[j].pp; |
| 2766 | if (pp_tmp == NULL) |
| 2767 | ferr(po, "arg collect hit unparsed call '%s'\n", |
| 2768 | ops[j].operand[0].name); |
| 2769 | if (may_reuse && pp_tmp->argc_stack > 0) |
| 2770 | ferr(po, "arg collect %d/%d hit '%s' with %d stack args\n", |
| 2771 | arg, pp->argc, opr_name(&ops[j], 0), pp_tmp->argc_stack); |
| 2772 | } |
| 2773 | // esp adjust of 0 means we collected it before |
| 2774 | else if (ops[j].op == OP_ADD && ops[j].operand[0].reg == xSP |
| 2775 | && (ops[j].operand[1].type != OPT_CONST |
| 2776 | || ops[j].operand[1].val != 0)) |
| 2777 | { |
| 2778 | if (pp->is_unresolved) |
| 2779 | break; |
| 2780 | |
| 2781 | ferr(po, "arg collect %d/%d hit esp adjust of %d\n", |
| 2782 | arg, pp->argc, ops[j].operand[1].val); |
| 2783 | } |
| 2784 | else if (ops[j].op == OP_POP) { |
| 2785 | if (pp->is_unresolved) |
| 2786 | break; |
| 2787 | |
| 2788 | ferr(po, "arg collect %d/%d hit pop\n", arg, pp->argc); |
| 2789 | } |
| 2790 | else if (ops[j].flags & OPF_CJMP) |
| 2791 | { |
| 2792 | if (pp->is_unresolved) |
| 2793 | break; |
| 2794 | |
| 2795 | may_reuse = 1; |
| 2796 | } |
| 2797 | else if (ops[j].op == OP_PUSH && !(ops[j].flags & OPF_FARG)) |
| 2798 | { |
| 2799 | if (pp->is_unresolved && (ops[j].flags & OPF_RMD)) |
| 2800 | break; |
| 2801 | |
| 2802 | pp->arg[arg].datap = &ops[j]; |
| 2803 | need_to_save_current = 0; |
| 2804 | save_args = 0; |
| 2805 | reg = -1; |
| 2806 | if (ops[j].operand[0].type == OPT_REG) |
| 2807 | reg = ops[j].operand[0].reg; |
| 2808 | |
| 2809 | if (!need_op_saving) { |
| 2810 | ret = scan_for_mod(&ops[j], j + 1, i, 1); |
| 2811 | need_to_save_current = (ret >= 0); |
| 2812 | } |
| 2813 | if (need_op_saving || need_to_save_current) { |
| 2814 | // mark this push as one that needs operand saving |
| 2815 | ops[j].flags &= ~OPF_RMD; |
| 2816 | if (ops[j].p_argnum == 0) { |
| 2817 | ops[j].p_argnum = arg + 1; |
| 2818 | save_args |= 1 << arg; |
| 2819 | } |
| 2820 | else if (ops[j].p_argnum < arg + 1) { |
| 2821 | // XXX: might kill valid var.. |
| 2822 | //*save_arg_vars &= ~(1 << (ops[j].p_argnum - 1)); |
| 2823 | ops[j].p_argnum = arg + 1; |
| 2824 | save_args |= 1 << arg; |
| 2825 | } |
| 2826 | } |
| 2827 | else if (ops[j].p_argnum == 0) |
| 2828 | ops[j].flags |= OPF_RMD; |
| 2829 | |
| 2830 | // some PUSHes are reused by different calls on other branches, |
| 2831 | // but that can't happen if we didn't branch, so they |
| 2832 | // can be removed from future searches (handles nested calls) |
| 2833 | if (!may_reuse) |
| 2834 | ops[j].flags |= OPF_FARG; |
| 2835 | |
| 2836 | ops[j].flags &= ~OPF_RSAVE; |
| 2837 | |
| 2838 | // check for __VALIST |
| 2839 | if (!pp->is_unresolved && pp->arg[arg].type.is_va_list) { |
| 2840 | k = -1; |
| 2841 | ret = resolve_origin(j, &ops[j].operand[0], magic + 1, &k); |
| 2842 | if (ret == 1 && k >= 0) |
| 2843 | { |
| 2844 | if (ops[k].op == OP_LEA) { |
| 2845 | snprintf(buf, sizeof(buf), "arg_%X", |
| 2846 | g_func_pp->argc_stack * 4); |
| 2847 | if (!g_func_pp->is_vararg |
| 2848 | || strstr(ops[k].operand[1].name, buf)) |
| 2849 | { |
| 2850 | ops[k].flags |= OPF_RMD; |
| 2851 | ops[j].flags |= OPF_RMD | OPF_VAPUSH; |
| 2852 | save_args &= ~(1 << arg); |
| 2853 | reg = -1; |
| 2854 | } |
| 2855 | else |
| 2856 | ferr(&ops[j], "lea va_list used, but no vararg?\n"); |
| 2857 | } |
| 2858 | // check for va_list from g_func_pp arg too |
| 2859 | else if (ops[k].op == OP_MOV |
| 2860 | && is_stack_access(&ops[k], &ops[k].operand[1])) |
| 2861 | { |
| 2862 | ret = stack_frame_access(&ops[k], &ops[k].operand[1], |
| 2863 | buf, sizeof(buf), ops[k].operand[1].name, "", 1, 0); |
| 2864 | if (ret >= 0) { |
| 2865 | ops[k].flags |= OPF_RMD; |
| 2866 | ops[j].flags |= OPF_RMD; |
| 2867 | ops[j].p_argpass = ret + 1; |
| 2868 | save_args &= ~(1 << arg); |
| 2869 | reg = -1; |
| 2870 | } |
| 2871 | } |
| 2872 | } |
| 2873 | } |
| 2874 | |
| 2875 | *save_arg_vars |= save_args; |
| 2876 | |
| 2877 | // tracking reg usage |
| 2878 | if (reg >= 0) |
| 2879 | *regmask |= 1 << reg; |
| 2880 | |
| 2881 | arg++; |
| 2882 | if (!pp->is_unresolved) { |
| 2883 | // next arg |
| 2884 | for (; arg < pp->argc; arg++) |
| 2885 | if (pp->arg[arg].reg == NULL) |
| 2886 | break; |
| 2887 | } |
| 2888 | magic = (magic & 0xffffff) | (arg << 24); |
| 2889 | } |
| 2890 | } |
| 2891 | |
| 2892 | if (arg < pp->argc) { |
| 2893 | ferr(po, "arg collect failed for '%s': %d/%d\n", |
| 2894 | pp->name, arg, pp->argc); |
| 2895 | return -1; |
| 2896 | } |
| 2897 | |
| 2898 | return arg; |
| 2899 | } |
| 2900 | |
| 2901 | static int collect_call_args(struct parsed_op *po, int i, |
| 2902 | struct parsed_proto *pp, int *regmask, int *save_arg_vars, |
| 2903 | int magic) |
| 2904 | { |
| 2905 | int ret; |
| 2906 | int a; |
| 2907 | |
| 2908 | ret = collect_call_args_r(po, i, pp, regmask, save_arg_vars, |
| 2909 | 0, magic, 0, 0); |
| 2910 | if (ret < 0) |
| 2911 | return ret; |
| 2912 | |
| 2913 | if (pp->is_unresolved) { |
| 2914 | pp->argc += ret; |
| 2915 | pp->argc_stack += ret; |
| 2916 | for (a = 0; a < pp->argc; a++) |
| 2917 | if (pp->arg[a].type.name == NULL) |
| 2918 | pp->arg[a].type.name = strdup("int"); |
| 2919 | } |
| 2920 | |
| 2921 | return ret; |
| 2922 | } |
| 2923 | |
| 2924 | // early check for tail call or branch back |
| 2925 | static int is_like_tailjmp(int j) |
| 2926 | { |
| 2927 | if (!(ops[j].flags & OPF_JMP)) |
| 2928 | return 0; |
| 2929 | |
| 2930 | if (ops[j].op == OP_JMP && !ops[j].operand[0].had_ds) |
| 2931 | // probably local branch back.. |
| 2932 | return 1; |
| 2933 | if (ops[j].op == OP_CALL) |
| 2934 | // probably noreturn call.. |
| 2935 | return 1; |
| 2936 | |
| 2937 | return 0; |
| 2938 | } |
| 2939 | |
| 2940 | static void pp_insert_reg_arg(struct parsed_proto *pp, const char *reg) |
| 2941 | { |
| 2942 | int i; |
| 2943 | |
| 2944 | for (i = 0; i < pp->argc; i++) |
| 2945 | if (pp->arg[i].reg == NULL) |
| 2946 | break; |
| 2947 | |
| 2948 | if (pp->argc_stack) |
| 2949 | memmove(&pp->arg[i + 1], &pp->arg[i], |
| 2950 | sizeof(pp->arg[0]) * pp->argc_stack); |
| 2951 | memset(&pp->arg[i], 0, sizeof(pp->arg[i])); |
| 2952 | pp->arg[i].reg = strdup(reg); |
| 2953 | pp->arg[i].type.name = strdup("int"); |
| 2954 | pp->argc++; |
| 2955 | pp->argc_reg++; |
| 2956 | } |
| 2957 | |
| 2958 | static void add_label_ref(struct label_ref *lr, int op_i) |
| 2959 | { |
| 2960 | struct label_ref *lr_new; |
| 2961 | |
| 2962 | if (lr->i == -1) { |
| 2963 | lr->i = op_i; |
| 2964 | return; |
| 2965 | } |
| 2966 | |
| 2967 | lr_new = calloc(1, sizeof(*lr_new)); |
| 2968 | lr_new->i = op_i; |
| 2969 | lr_new->next = lr->next; |
| 2970 | lr->next = lr_new; |
| 2971 | } |
| 2972 | |
| 2973 | static void output_std_flags(FILE *fout, struct parsed_op *po, |
| 2974 | int *pfomask, const char *dst_opr_text) |
| 2975 | { |
| 2976 | if (*pfomask & (1 << PFO_Z)) { |
| 2977 | fprintf(fout, "\n cond_z = (%s%s == 0);", |
| 2978 | lmod_cast_u(po, po->operand[0].lmod), dst_opr_text); |
| 2979 | *pfomask &= ~(1 << PFO_Z); |
| 2980 | } |
| 2981 | if (*pfomask & (1 << PFO_S)) { |
| 2982 | fprintf(fout, "\n cond_s = (%s%s < 0);", |
| 2983 | lmod_cast_s(po, po->operand[0].lmod), dst_opr_text); |
| 2984 | *pfomask &= ~(1 << PFO_S); |
| 2985 | } |
| 2986 | } |
| 2987 | |
| 2988 | static void output_pp_attrs(FILE *fout, const struct parsed_proto *pp, |
| 2989 | int is_noreturn) |
| 2990 | { |
| 2991 | if (pp->is_fastcall) |
| 2992 | fprintf(fout, "__fastcall "); |
| 2993 | else if (pp->is_stdcall && pp->argc_reg == 0) |
| 2994 | fprintf(fout, "__stdcall "); |
| 2995 | if (pp->is_noreturn || is_noreturn) |
| 2996 | fprintf(fout, "noreturn "); |
| 2997 | } |
| 2998 | |
| 2999 | static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) |
| 3000 | { |
| 3001 | struct parsed_op *po, *delayed_flag_op = NULL, *tmp_op; |
| 3002 | struct parsed_opr *last_arith_dst = NULL; |
| 3003 | char buf1[256], buf2[256], buf3[256], cast[64]; |
| 3004 | const struct parsed_proto *pp_c; |
| 3005 | struct parsed_proto *pp, *pp_tmp; |
| 3006 | struct parsed_data *pd; |
| 3007 | const char *tmpname; |
| 3008 | unsigned int uval; |
| 3009 | int save_arg_vars = 0; |
| 3010 | int cond_vars = 0; |
| 3011 | int need_tmp_var = 0; |
| 3012 | int need_tmp64 = 0; |
| 3013 | int had_decl = 0; |
| 3014 | int label_pending = 0; |
| 3015 | int regmask_save = 0; |
| 3016 | int regmask_arg = 0; |
| 3017 | int regmask_now = 0; |
| 3018 | int regmask_init = 0; |
| 3019 | int regmask = 0; |
| 3020 | int pfomask = 0; |
| 3021 | int found = 0; |
| 3022 | int depth = 0; |
| 3023 | int no_output; |
| 3024 | int i, j, l; |
| 3025 | int arg; |
| 3026 | int reg; |
| 3027 | int ret; |
| 3028 | |
| 3029 | g_bp_frame = g_sp_frame = g_stack_fsz = 0; |
| 3030 | g_stack_frame_used = 0; |
| 3031 | |
| 3032 | g_func_pp = proto_parse(fhdr, funcn, 0); |
| 3033 | if (g_func_pp == NULL) |
| 3034 | ferr(ops, "proto_parse failed for '%s'\n", funcn); |
| 3035 | |
| 3036 | for (i = 0; i < g_func_pp->argc; i++) { |
| 3037 | if (g_func_pp->arg[i].reg != NULL) { |
| 3038 | reg = char_array_i(regs_r32, |
| 3039 | ARRAY_SIZE(regs_r32), g_func_pp->arg[i].reg); |
| 3040 | if (reg < 0) |
| 3041 | ferr(ops, "arg '%s' is not a reg?\n", g_func_pp->arg[i].reg); |
| 3042 | regmask_arg |= 1 << reg; |
| 3043 | } |
| 3044 | } |
| 3045 | |
| 3046 | // pass1: |
| 3047 | // - handle ebp/esp frame, remove ops related to it |
| 3048 | if (ops[0].op == OP_PUSH && IS(opr_name(&ops[0], 0), "ebp") |
| 3049 | && ops[1].op == OP_MOV |
| 3050 | && IS(opr_name(&ops[1], 0), "ebp") |
| 3051 | && IS(opr_name(&ops[1], 1), "esp")) |
| 3052 | { |
| 3053 | int ecx_push = 0; |
| 3054 | |
| 3055 | g_bp_frame = 1; |
| 3056 | ops[0].flags |= OPF_RMD; |
| 3057 | ops[1].flags |= OPF_RMD; |
| 3058 | i = 2; |
| 3059 | |
| 3060 | if (ops[2].op == OP_SUB && IS(opr_name(&ops[2], 0), "esp")) { |
| 3061 | g_stack_fsz = opr_const(&ops[2], 1); |
| 3062 | ops[2].flags |= OPF_RMD; |
| 3063 | i++; |
| 3064 | } |
| 3065 | else { |
| 3066 | // another way msvc builds stack frame.. |
| 3067 | i = 2; |
| 3068 | while (ops[i].op == OP_PUSH && IS(opr_name(&ops[i], 0), "ecx")) { |
| 3069 | g_stack_fsz += 4; |
| 3070 | ops[i].flags |= OPF_RMD; |
| 3071 | ecx_push++; |
| 3072 | i++; |
| 3073 | } |
| 3074 | // and another way.. |
| 3075 | if (i == 2 && ops[i].op == OP_MOV && ops[i].operand[0].reg == xAX |
| 3076 | && ops[i].operand[1].type == OPT_CONST |
| 3077 | && ops[i + 1].op == OP_CALL |
| 3078 | && IS(opr_name(&ops[i + 1], 0), "__alloca_probe")) |
| 3079 | { |
| 3080 | g_stack_fsz += ops[i].operand[1].val; |
| 3081 | ops[i].flags |= OPF_RMD; |
| 3082 | i++; |
| 3083 | ops[i].flags |= OPF_RMD; |
| 3084 | i++; |
| 3085 | } |
| 3086 | } |
| 3087 | |
| 3088 | found = 0; |
| 3089 | do { |
| 3090 | for (; i < opcnt; i++) |
| 3091 | if (ops[i].op == OP_RET) |
| 3092 | break; |
| 3093 | j = i - 1; |
| 3094 | if (i == opcnt && (ops[j].flags & OPF_JMP)) { |
| 3095 | if (found && is_like_tailjmp(j)) |
| 3096 | break; |
| 3097 | j--; |
| 3098 | } |
| 3099 | |
| 3100 | if ((ops[j].op == OP_POP && IS(opr_name(&ops[j], 0), "ebp")) |
| 3101 | || ops[j].op == OP_LEAVE) |
| 3102 | { |
| 3103 | ops[j].flags |= OPF_RMD; |
| 3104 | } |
| 3105 | else if (!(g_ida_func_attr & IDAFA_NORETURN)) |
| 3106 | ferr(&ops[j], "'pop ebp' expected\n"); |
| 3107 | |
| 3108 | if (g_stack_fsz != 0) { |
| 3109 | if (ops[j - 1].op == OP_MOV |
| 3110 | && IS(opr_name(&ops[j - 1], 0), "esp") |
| 3111 | && IS(opr_name(&ops[j - 1], 1), "ebp")) |
| 3112 | { |
| 3113 | ops[j - 1].flags |= OPF_RMD; |
| 3114 | } |
| 3115 | else if (ops[j].op != OP_LEAVE |
| 3116 | && !(g_ida_func_attr & IDAFA_NORETURN)) |
| 3117 | { |
| 3118 | ferr(&ops[j - 1], "esp restore expected\n"); |
| 3119 | } |
| 3120 | |
| 3121 | if (ecx_push && ops[j - 2].op == OP_POP |
| 3122 | && IS(opr_name(&ops[j - 2], 0), "ecx")) |
| 3123 | { |
| 3124 | ferr(&ops[j - 2], "unexpected ecx pop\n"); |
| 3125 | } |
| 3126 | } |
| 3127 | |
| 3128 | found = 1; |
| 3129 | i++; |
| 3130 | } while (i < opcnt); |
| 3131 | } |
| 3132 | else { |
| 3133 | int ecx_push = 0, esp_sub = 0; |
| 3134 | |
| 3135 | i = 0; |
| 3136 | while (ops[i].op == OP_PUSH && IS(opr_name(&ops[i], 0), "ecx")) { |
| 3137 | ops[i].flags |= OPF_RMD; |
| 3138 | g_stack_fsz += 4; |
| 3139 | ecx_push++; |
| 3140 | i++; |
| 3141 | } |
| 3142 | |
| 3143 | for (; i < opcnt; i++) { |
| 3144 | if (ops[i].op == OP_PUSH || (ops[i].flags & (OPF_JMP|OPF_TAIL))) |
| 3145 | break; |
| 3146 | if (ops[i].op == OP_SUB && ops[i].operand[0].reg == xSP |
| 3147 | && ops[i].operand[1].type == OPT_CONST) |
| 3148 | { |
| 3149 | g_stack_fsz = ops[i].operand[1].val; |
| 3150 | ops[i].flags |= OPF_RMD; |
| 3151 | esp_sub = 1; |
| 3152 | break; |
| 3153 | } |
| 3154 | } |
| 3155 | |
| 3156 | found = 0; |
| 3157 | if (ecx_push || esp_sub) |
| 3158 | { |
| 3159 | g_sp_frame = 1; |
| 3160 | |
| 3161 | i++; |
| 3162 | do { |
| 3163 | for (; i < opcnt; i++) |
| 3164 | if (ops[i].op == OP_RET) |
| 3165 | break; |
| 3166 | j = i - 1; |
| 3167 | if (i == opcnt && (ops[j].flags & OPF_JMP)) { |
| 3168 | if (found && is_like_tailjmp(j)) |
| 3169 | break; |
| 3170 | j--; |
| 3171 | } |
| 3172 | |
| 3173 | if (ecx_push > 0) { |
| 3174 | for (l = 0; l < ecx_push; l++) { |
| 3175 | if (ops[j].op != OP_POP |
| 3176 | || !IS(opr_name(&ops[j], 0), "ecx")) |
| 3177 | { |
| 3178 | ferr(&ops[j], "'pop ecx' expected\n"); |
| 3179 | } |
| 3180 | ops[j].flags |= OPF_RMD; |
| 3181 | j--; |
| 3182 | } |
| 3183 | |
| 3184 | found = 1; |
| 3185 | } |
| 3186 | |
| 3187 | if (esp_sub) { |
| 3188 | if (ops[j].op != OP_ADD |
| 3189 | || !IS(opr_name(&ops[j], 0), "esp") |
| 3190 | || ops[j].operand[1].type != OPT_CONST |
| 3191 | || ops[j].operand[1].val != g_stack_fsz) |
| 3192 | ferr(&ops[j], "'add esp' expected\n"); |
| 3193 | ops[j].flags |= OPF_RMD; |
| 3194 | |
| 3195 | found = 1; |
| 3196 | } |
| 3197 | |
| 3198 | i++; |
| 3199 | } while (i < opcnt); |
| 3200 | } |
| 3201 | } |
| 3202 | |
| 3203 | // pass2: |
| 3204 | // - parse calls with labels |
| 3205 | // - resolve all branches |
| 3206 | for (i = 0; i < opcnt; i++) |
| 3207 | { |
| 3208 | po = &ops[i]; |
| 3209 | po->bt_i = -1; |
| 3210 | po->btj = NULL; |
| 3211 | |
| 3212 | if (po->flags & OPF_RMD) |
| 3213 | continue; |
| 3214 | |
| 3215 | if (po->op == OP_CALL) { |
| 3216 | pp = NULL; |
| 3217 | |
| 3218 | if (po->operand[0].type == OPT_LABEL) { |
| 3219 | tmpname = opr_name(po, 0); |
| 3220 | if (IS_START(tmpname, "loc_")) |
| 3221 | ferr(po, "call to loc_*\n"); |
| 3222 | pp_c = proto_parse(fhdr, tmpname, 0); |
| 3223 | if (pp_c == NULL) |
| 3224 | ferr(po, "proto_parse failed for call '%s'\n", tmpname); |
| 3225 | |
| 3226 | pp = proto_clone(pp_c); |
| 3227 | my_assert_not(pp, NULL); |
| 3228 | } |
| 3229 | else if (po->datap != NULL) { |
| 3230 | pp = calloc(1, sizeof(*pp)); |
| 3231 | my_assert_not(pp, NULL); |
| 3232 | |
| 3233 | ret = parse_protostr(po->datap, pp); |
| 3234 | if (ret < 0) |
| 3235 | ferr(po, "bad protostr supplied: %s\n", (char *)po->datap); |
| 3236 | free(po->datap); |
| 3237 | po->datap = NULL; |
| 3238 | } |
| 3239 | |
| 3240 | if (pp != NULL) { |
| 3241 | if (pp->is_fptr) |
| 3242 | check_func_pp(po, pp, "fptr var call"); |
| 3243 | if (pp->is_noreturn) |
| 3244 | po->flags |= OPF_TAIL; |
| 3245 | } |
| 3246 | po->pp = pp; |
| 3247 | continue; |
| 3248 | } |
| 3249 | |
| 3250 | if (!(po->flags & OPF_JMP) || po->op == OP_RET) |
| 3251 | continue; |
| 3252 | |
| 3253 | if (po->operand[0].type == OPT_REGMEM) { |
| 3254 | char *p = strchr(po->operand[0].name, '['); |
| 3255 | if (p == NULL) |
| 3256 | goto tailcall; |
| 3257 | ret = p - po->operand[0].name; |
| 3258 | strncpy(buf1, po->operand[0].name, ret); |
| 3259 | buf1[ret] = 0; |
| 3260 | |
| 3261 | for (j = 0, pd = NULL; j < g_func_pd_cnt; j++) { |
| 3262 | if (IS(g_func_pd[j].label, buf1)) { |
| 3263 | pd = &g_func_pd[j]; |
| 3264 | break; |
| 3265 | } |
| 3266 | } |
| 3267 | if (pd == NULL) |
| 3268 | //ferr(po, "label '%s' not parsed?\n", buf1); |
| 3269 | goto tailcall; |
| 3270 | if (pd->type != OPT_OFFSET) |
| 3271 | ferr(po, "label '%s' with non-offset data?\n", buf1); |
| 3272 | |
| 3273 | // find all labels, link |
| 3274 | for (j = 0; j < pd->count; j++) { |
| 3275 | for (l = 0; l < opcnt; l++) { |
| 3276 | if (g_labels[l][0] && IS(g_labels[l], pd->d[j].u.label)) { |
| 3277 | add_label_ref(&g_label_refs[l], i); |
| 3278 | pd->d[j].bt_i = l; |
| 3279 | break; |
| 3280 | } |
| 3281 | } |
| 3282 | } |
| 3283 | |
| 3284 | po->btj = pd; |
| 3285 | continue; |
| 3286 | } |
| 3287 | |
| 3288 | for (l = 0; l < opcnt; l++) { |
| 3289 | if (g_labels[l][0] && IS(po->operand[0].name, g_labels[l])) { |
| 3290 | if (l == i + 1 && po->op == OP_JMP) { |
| 3291 | // yet another alignment type.. |
| 3292 | po->flags |= OPF_RMD; |
| 3293 | break; |
| 3294 | } |
| 3295 | add_label_ref(&g_label_refs[l], i); |
| 3296 | po->bt_i = l; |
| 3297 | break; |
| 3298 | } |
| 3299 | } |
| 3300 | |
| 3301 | if (po->bt_i != -1 || (po->flags & OPF_RMD)) |
| 3302 | continue; |
| 3303 | |
| 3304 | if (po->operand[0].type == OPT_LABEL) |
| 3305 | // assume tail call |
| 3306 | goto tailcall; |
| 3307 | |
| 3308 | ferr(po, "unhandled branch\n"); |
| 3309 | |
| 3310 | tailcall: |
| 3311 | po->op = OP_CALL; |
| 3312 | po->flags |= OPF_TAIL; |
| 3313 | if (i > 0 && ops[i - 1].op == OP_POP) |
| 3314 | po->flags |= OPF_ATAIL; |
| 3315 | i--; // reprocess |
| 3316 | } |
| 3317 | |
| 3318 | // pass3: |
| 3319 | // - remove dead labels |
| 3320 | // - process calls |
| 3321 | for (i = 0; i < opcnt; i++) |
| 3322 | { |
| 3323 | if (g_labels[i][0] != 0 && g_label_refs[i].i == -1) |
| 3324 | g_labels[i][0] = 0; |
| 3325 | |
| 3326 | po = &ops[i]; |
| 3327 | if (po->flags & OPF_RMD) |
| 3328 | continue; |
| 3329 | |
| 3330 | if (po->op == OP_CALL) |
| 3331 | { |
| 3332 | tmpname = opr_name(po, 0); |
| 3333 | pp = po->pp; |
| 3334 | if (pp == NULL) |
| 3335 | { |
| 3336 | // indirect call |
| 3337 | pp_c = resolve_icall(i, opcnt, &l); |
| 3338 | if (pp_c != NULL) { |
| 3339 | if (!pp_c->is_func && !pp_c->is_fptr) |
| 3340 | ferr(po, "call to non-func: %s\n", pp_c->name); |
| 3341 | pp = proto_clone(pp_c); |
| 3342 | my_assert_not(pp, NULL); |
| 3343 | if (l) |
| 3344 | // not resolved just to single func |
| 3345 | pp->is_fptr = 1; |
| 3346 | |
| 3347 | switch (po->operand[0].type) { |
| 3348 | case OPT_REG: |
| 3349 | // we resolved this call and no longer need the register |
| 3350 | po->regmask_src &= ~(1 << po->operand[0].reg); |
| 3351 | break; |
| 3352 | case OPT_REGMEM: |
| 3353 | pp->is_fptr = 1; |
| 3354 | break; |
| 3355 | default: |
| 3356 | break; |
| 3357 | } |
| 3358 | } |
| 3359 | if (pp == NULL) { |
| 3360 | pp = calloc(1, sizeof(*pp)); |
| 3361 | my_assert_not(pp, NULL); |
| 3362 | pp->is_fptr = 1; |
| 3363 | ret = scan_for_esp_adjust(i + 1, opcnt, &j, &l); |
| 3364 | if (ret < 0) { |
| 3365 | if (!g_allow_regfunc) |
| 3366 | ferr(po, "non-__cdecl indirect call unhandled yet\n"); |
| 3367 | pp->is_unresolved = 1; |
| 3368 | j = 0; |
| 3369 | } |
| 3370 | j /= 4; |
| 3371 | if (j > ARRAY_SIZE(pp->arg)) |
| 3372 | ferr(po, "esp adjust too large: %d\n", j); |
| 3373 | pp->ret_type.name = strdup("int"); |
| 3374 | pp->argc = pp->argc_stack = j; |
| 3375 | for (arg = 0; arg < pp->argc; arg++) |
| 3376 | pp->arg[arg].type.name = strdup("int"); |
| 3377 | } |
| 3378 | po->pp = pp; |
| 3379 | } |
| 3380 | |
| 3381 | // look for and make use of esp adjust |
| 3382 | ret = -1; |
| 3383 | if (!pp->is_stdcall && pp->argc_stack > 0) |
| 3384 | ret = scan_for_esp_adjust(i + 1, opcnt, &j, &l); |
| 3385 | if (ret >= 0) { |
| 3386 | if (pp->is_vararg) { |
| 3387 | if (j / 4 < pp->argc_stack) |
| 3388 | ferr(po, "esp adjust is too small: %x < %x\n", |
| 3389 | j, pp->argc_stack * 4); |
| 3390 | // modify pp to make it have varargs as normal args |
| 3391 | arg = pp->argc; |
| 3392 | pp->argc += j / 4 - pp->argc_stack; |
| 3393 | for (; arg < pp->argc; arg++) { |
| 3394 | pp->arg[arg].type.name = strdup("int"); |
| 3395 | pp->argc_stack++; |
| 3396 | } |
| 3397 | if (pp->argc > ARRAY_SIZE(pp->arg)) |
| 3398 | ferr(po, "too many args for '%s'\n", tmpname); |
| 3399 | } |
| 3400 | if (pp->argc_stack != j / 4) |
| 3401 | ferr(po, "stack tracking failed for '%s': %x %x\n", |
| 3402 | tmpname, pp->argc_stack * 4, j); |
| 3403 | |
| 3404 | ops[ret].flags |= OPF_RMD; |
| 3405 | if (ops[ret].op == OP_POP && j > 4) { |
| 3406 | // deal with multi-pop stack adjust |
| 3407 | j = pp->argc_stack; |
| 3408 | while (ops[ret].op == OP_POP && j > 0 && ret < opcnt) { |
| 3409 | ops[ret].flags |= OPF_RMD; |
| 3410 | j--; |
| 3411 | ret++; |
| 3412 | } |
| 3413 | } |
| 3414 | else if (!l) { |
| 3415 | // a bit of a hack, but deals with use of |
| 3416 | // single adj for multiple calls |
| 3417 | ops[ret].operand[1].val -= j; |
| 3418 | } |
| 3419 | } |
| 3420 | else if (pp->is_vararg) |
| 3421 | ferr(po, "missing esp_adjust for vararg func '%s'\n", |
| 3422 | pp->name); |
| 3423 | |
| 3424 | if (!pp->is_unresolved && !(po->flags & OPF_ATAIL)) { |
| 3425 | // since we know the args, collect them |
| 3426 | collect_call_args(po, i, pp, ®mask, &save_arg_vars, |
| 3427 | i + opcnt * 2); |
| 3428 | } |
| 3429 | |
| 3430 | if (strstr(pp->ret_type.name, "int64")) |
| 3431 | need_tmp64 = 1; |
| 3432 | } |
| 3433 | } |
| 3434 | |
| 3435 | // pass4: |
| 3436 | // - find POPs for PUSHes, rm both |
| 3437 | // - scan for STD/CLD, propagate DF |
| 3438 | // - scan for all used registers |
| 3439 | // - find flag set ops for their users |
| 3440 | // - do unreselved calls |
| 3441 | // - declare indirect functions |
| 3442 | for (i = 0; i < opcnt; i++) { |
| 3443 | po = &ops[i]; |
| 3444 | if (po->flags & OPF_RMD) |
| 3445 | continue; |
| 3446 | |
| 3447 | if (po->op == OP_PUSH && (po->flags & OPF_RSAVE)) { |
| 3448 | reg = po->operand[0].reg; |
| 3449 | if (!(regmask & (1 << reg))) |
| 3450 | // not a reg save after all, rerun scan_for_pop |
| 3451 | po->flags &= ~OPF_RSAVE; |
| 3452 | else |
| 3453 | regmask_save |= 1 << reg; |
| 3454 | } |
| 3455 | |
| 3456 | if (po->op == OP_PUSH && po->p_argnum == 0 |
| 3457 | && !(po->flags & OPF_RSAVE) && !g_func_pp->is_userstack) |
| 3458 | { |
| 3459 | if (po->operand[0].type == OPT_REG) |
| 3460 | { |
| 3461 | reg = po->operand[0].reg; |
| 3462 | if (reg < 0) |
| 3463 | ferr(po, "reg not set for push?\n"); |
| 3464 | |
| 3465 | depth = 0; |
| 3466 | ret = scan_for_pop(i + 1, opcnt, |
| 3467 | po->operand[0].name, i + opcnt * 3, 0, &depth, 0); |
| 3468 | if (ret == 1) { |
| 3469 | if (depth > 1) |
| 3470 | ferr(po, "too much depth: %d\n", depth); |
| 3471 | |
| 3472 | po->flags |= OPF_RMD; |
| 3473 | scan_for_pop(i + 1, opcnt, po->operand[0].name, |
| 3474 | i + opcnt * 4, 0, &depth, 1); |
| 3475 | continue; |
| 3476 | } |
| 3477 | ret = scan_for_pop_ret(i + 1, opcnt, po->operand[0].name, 0); |
| 3478 | if (ret == 0) { |
| 3479 | arg = OPF_RMD; |
| 3480 | if (regmask & (1 << reg)) { |
| 3481 | if (regmask_save & (1 << reg)) |
| 3482 | ferr(po, "%s already saved?\n", po->operand[0].name); |
| 3483 | arg = OPF_RSAVE; |
| 3484 | } |
| 3485 | po->flags |= arg; |
| 3486 | scan_for_pop_ret(i + 1, opcnt, po->operand[0].name, arg); |
| 3487 | continue; |
| 3488 | } |
| 3489 | } |
| 3490 | else if (po->operand[0].type == OPT_CONST) { |
| 3491 | for (j = i + 1; j < opcnt; j++) { |
| 3492 | if ((ops[j].flags & (OPF_JMP|OPF_TAIL|OPF_RSAVE)) |
| 3493 | || ops[j].op == OP_PUSH || g_labels[i][0] != 0) |
| 3494 | { |
| 3495 | break; |
| 3496 | } |
| 3497 | |
| 3498 | if (!(ops[j].flags & OPF_RMD) && ops[j].op == OP_POP) |
| 3499 | { |
| 3500 | po->flags |= OPF_RMD; |
| 3501 | ops[j].datap = po; |
| 3502 | break; |
| 3503 | } |
| 3504 | } |
| 3505 | } |
| 3506 | } |
| 3507 | |
| 3508 | if (po->op == OP_STD) { |
| 3509 | po->flags |= OPF_DF | OPF_RMD; |
| 3510 | scan_propagate_df(i + 1, opcnt); |
| 3511 | } |
| 3512 | |
| 3513 | regmask_now = po->regmask_src | po->regmask_dst; |
| 3514 | if (regmask_now & (1 << xBP)) { |
| 3515 | if (g_bp_frame && !(po->flags & OPF_EBP_S)) { |
| 3516 | if (po->regmask_dst & (1 << xBP)) |
| 3517 | // compiler decided to drop bp frame and use ebp as scratch |
| 3518 | scan_fwd_set_flags(i + 1, opcnt, i + opcnt * 5, OPF_EBP_S); |
| 3519 | else |
| 3520 | regmask_now &= ~(1 << xBP); |
| 3521 | } |
| 3522 | } |
| 3523 | |
| 3524 | regmask |= regmask_now; |
| 3525 | |
| 3526 | if (po->flags & OPF_CC) |
| 3527 | { |
| 3528 | int setters[16], cnt = 0, branched = 0; |
| 3529 | |
| 3530 | ret = scan_for_flag_set(i, i + opcnt * 6, |
| 3531 | &branched, setters, &cnt); |
| 3532 | if (ret < 0 || cnt <= 0) |
| 3533 | ferr(po, "unable to trace flag setter(s)\n"); |
| 3534 | if (cnt > ARRAY_SIZE(setters)) |
| 3535 | ferr(po, "too many flag setters\n"); |
| 3536 | |
| 3537 | for (j = 0; j < cnt; j++) |
| 3538 | { |
| 3539 | tmp_op = &ops[setters[j]]; // flag setter |
| 3540 | pfomask = 0; |
| 3541 | |
| 3542 | // to get nicer code, we try to delay test and cmp; |
| 3543 | // if we can't because of operand modification, or if we |
| 3544 | // have arith op, or branch, make it calculate flags explicitly |
| 3545 | if (tmp_op->op == OP_TEST || tmp_op->op == OP_CMP) |
| 3546 | { |
| 3547 | if (branched || scan_for_mod(tmp_op, setters[j] + 1, i, 0) >= 0) |
| 3548 | pfomask = 1 << po->pfo; |
| 3549 | } |
| 3550 | else if (tmp_op->op == OP_CMPS || tmp_op->op == OP_SCAS) { |
| 3551 | pfomask = 1 << po->pfo; |
| 3552 | } |
| 3553 | else { |
| 3554 | // see if we'll be able to handle based on op result |
| 3555 | if ((tmp_op->op != OP_AND && tmp_op->op != OP_OR |
| 3556 | && po->pfo != PFO_Z && po->pfo != PFO_S |
| 3557 | && po->pfo != PFO_P) |
| 3558 | || branched |
| 3559 | || scan_for_mod_opr0(tmp_op, setters[j] + 1, i) >= 0) |
| 3560 | { |
| 3561 | pfomask = 1 << po->pfo; |
| 3562 | } |
| 3563 | |
| 3564 | if (tmp_op->op == OP_ADD && po->pfo == PFO_C) { |
| 3565 | propagate_lmod(tmp_op, &tmp_op->operand[0], |
| 3566 | &tmp_op->operand[1]); |
| 3567 | if (tmp_op->operand[0].lmod == OPLM_DWORD) |
| 3568 | need_tmp64 = 1; |
| 3569 | } |
| 3570 | } |
| 3571 | if (pfomask) { |
| 3572 | tmp_op->pfomask |= pfomask; |
| 3573 | cond_vars |= pfomask; |
| 3574 | } |
| 3575 | // note: may overwrite, currently not a problem |
| 3576 | po->datap = tmp_op; |
| 3577 | } |
| 3578 | |
| 3579 | if (po->op == OP_RCL || po->op == OP_RCR |
| 3580 | || po->op == OP_ADC || po->op == OP_SBB) |
| 3581 | cond_vars |= 1 << PFO_C; |
| 3582 | } |
| 3583 | |
| 3584 | if (po->op == OP_CMPS || po->op == OP_SCAS) { |
| 3585 | cond_vars |= 1 << PFO_Z; |
| 3586 | } |
| 3587 | else if (po->op == OP_MUL |
| 3588 | || (po->op == OP_IMUL && po->operand_cnt == 1)) |
| 3589 | { |
| 3590 | if (po->operand[0].lmod == OPLM_DWORD) |
| 3591 | need_tmp64 = 1; |
| 3592 | } |
| 3593 | else if (po->op == OP_CALL) { |
| 3594 | pp = po->pp; |
| 3595 | if (pp == NULL) |
| 3596 | ferr(po, "NULL pp\n"); |
| 3597 | |
| 3598 | if (pp->is_unresolved) { |
| 3599 | int regmask_stack = 0; |
| 3600 | collect_call_args(po, i, pp, ®mask, &save_arg_vars, |
| 3601 | i + opcnt * 2); |
| 3602 | |
| 3603 | // this is pretty rough guess: |
| 3604 | // see ecx and edx were pushed (and not their saved versions) |
| 3605 | for (arg = 0; arg < pp->argc; arg++) { |
| 3606 | if (pp->arg[arg].reg != NULL) |
| 3607 | continue; |
| 3608 | |
| 3609 | tmp_op = pp->arg[arg].datap; |
| 3610 | if (tmp_op == NULL) |
| 3611 | ferr(po, "parsed_op missing for arg%d\n", arg); |
| 3612 | if (tmp_op->p_argnum == 0 && tmp_op->operand[0].type == OPT_REG) |
| 3613 | regmask_stack |= 1 << tmp_op->operand[0].reg; |
| 3614 | } |
| 3615 | |
| 3616 | if (!((regmask_stack & (1 << xCX)) |
| 3617 | && (regmask_stack & (1 << xDX)))) |
| 3618 | { |
| 3619 | if (pp->argc_stack != 0 |
| 3620 | || ((regmask | regmask_arg) & ((1 << xCX)|(1 << xDX)))) |
| 3621 | { |
| 3622 | pp_insert_reg_arg(pp, "ecx"); |
| 3623 | pp->is_fastcall = 1; |
| 3624 | regmask_init |= 1 << xCX; |
| 3625 | regmask |= 1 << xCX; |
| 3626 | } |
| 3627 | if (pp->argc_stack != 0 |
| 3628 | || ((regmask | regmask_arg) & (1 << xDX))) |
| 3629 | { |
| 3630 | pp_insert_reg_arg(pp, "edx"); |
| 3631 | regmask_init |= 1 << xDX; |
| 3632 | regmask |= 1 << xDX; |
| 3633 | } |
| 3634 | } |
| 3635 | |
| 3636 | // note: __cdecl doesn't fall into is_unresolved category |
| 3637 | if (pp->argc_stack > 0) |
| 3638 | pp->is_stdcall = 1; |
| 3639 | } |
| 3640 | |
| 3641 | for (arg = 0; arg < pp->argc; arg++) { |
| 3642 | if (pp->arg[arg].reg != NULL) { |
| 3643 | reg = char_array_i(regs_r32, |
| 3644 | ARRAY_SIZE(regs_r32), pp->arg[arg].reg); |
| 3645 | if (reg < 0) |
| 3646 | ferr(ops, "arg '%s' is not a reg?\n", pp->arg[arg].reg); |
| 3647 | if (!(regmask & (1 << reg))) { |
| 3648 | regmask_init |= 1 << reg; |
| 3649 | regmask |= 1 << reg; |
| 3650 | } |
| 3651 | } |
| 3652 | } |
| 3653 | } |
| 3654 | else if (po->op == OP_MOV && po->operand[0].pp != NULL |
| 3655 | && po->operand[1].pp != NULL) |
| 3656 | { |
| 3657 | // <var> = offset <something> |
| 3658 | if ((po->operand[1].pp->is_func || po->operand[1].pp->is_fptr) |
| 3659 | && !IS_START(po->operand[1].name, "off_")) |
| 3660 | { |
| 3661 | if (!po->operand[0].pp->is_fptr) |
| 3662 | ferr(po, "%s not declared as fptr when it should be\n", |
| 3663 | po->operand[0].name); |
| 3664 | if (pp_cmp_func(po->operand[0].pp, po->operand[1].pp)) { |
| 3665 | pp_print(buf1, sizeof(buf1), po->operand[0].pp); |
| 3666 | pp_print(buf2, sizeof(buf2), po->operand[1].pp); |
| 3667 | fnote(po, "var: %s\n", buf1); |
| 3668 | fnote(po, "func: %s\n", buf2); |
| 3669 | ferr(po, "^ mismatch\n"); |
| 3670 | } |
| 3671 | } |
| 3672 | } |
| 3673 | else if (po->op == OP_RET && !IS(g_func_pp->ret_type.name, "void")) |
| 3674 | regmask |= 1 << xAX; |
| 3675 | else if (po->op == OP_DIV || po->op == OP_IDIV) { |
| 3676 | // 32bit division is common, look for it |
| 3677 | if (po->op == OP_DIV) |
| 3678 | ret = scan_for_reg_clear(i, xDX); |
| 3679 | else |
| 3680 | ret = scan_for_cdq_edx(i); |
| 3681 | if (ret >= 0) |
| 3682 | po->flags |= OPF_32BIT; |
| 3683 | else |
| 3684 | need_tmp64 = 1; |
| 3685 | } |
| 3686 | else if (po->op == OP_CLD) |
| 3687 | po->flags |= OPF_RMD; |
| 3688 | |
| 3689 | if (po->op == OP_RCL || po->op == OP_RCR || po->op == OP_XCHG) { |
| 3690 | need_tmp_var = 1; |
| 3691 | } |
| 3692 | } |
| 3693 | |
| 3694 | // pass4: |
| 3695 | // - confirm regmask_save, it might have been reduced |
| 3696 | if (regmask_save != 0) |
| 3697 | { |
| 3698 | regmask_save = 0; |
| 3699 | for (i = 0; i < opcnt; i++) { |
| 3700 | po = &ops[i]; |
| 3701 | if (po->flags & OPF_RMD) |
| 3702 | continue; |
| 3703 | |
| 3704 | if (po->op == OP_PUSH && (po->flags & OPF_RSAVE)) |
| 3705 | regmask_save |= 1 << po->operand[0].reg; |
| 3706 | } |
| 3707 | } |
| 3708 | |
| 3709 | // output starts here |
| 3710 | |
| 3711 | // define userstack size |
| 3712 | if (g_func_pp->is_userstack) { |
| 3713 | fprintf(fout, "#ifndef US_SZ_%s\n", g_func_pp->name); |
| 3714 | fprintf(fout, "#define US_SZ_%s USERSTACK_SIZE\n", g_func_pp->name); |
| 3715 | fprintf(fout, "#endif\n"); |
| 3716 | } |
| 3717 | |
| 3718 | // the function itself |
| 3719 | fprintf(fout, "%s ", g_func_pp->ret_type.name); |
| 3720 | output_pp_attrs(fout, g_func_pp, g_ida_func_attr & IDAFA_NORETURN); |
| 3721 | fprintf(fout, "%s(", g_func_pp->name); |
| 3722 | |
| 3723 | for (i = 0; i < g_func_pp->argc; i++) { |
| 3724 | if (i > 0) |
| 3725 | fprintf(fout, ", "); |
| 3726 | if (g_func_pp->arg[i].fptr != NULL) { |
| 3727 | // func pointer.. |
| 3728 | pp = g_func_pp->arg[i].fptr; |
| 3729 | fprintf(fout, "%s (", pp->ret_type.name); |
| 3730 | output_pp_attrs(fout, pp, 0); |
| 3731 | fprintf(fout, "*a%d)(", i + 1); |
| 3732 | for (j = 0; j < pp->argc; j++) { |
| 3733 | if (j > 0) |
| 3734 | fprintf(fout, ", "); |
| 3735 | if (pp->arg[j].fptr) |
| 3736 | ferr(ops, "nested fptr\n"); |
| 3737 | fprintf(fout, "%s", pp->arg[j].type.name); |
| 3738 | } |
| 3739 | if (pp->is_vararg) { |
| 3740 | if (j > 0) |
| 3741 | fprintf(fout, ", "); |
| 3742 | fprintf(fout, "..."); |
| 3743 | } |
| 3744 | fprintf(fout, ")"); |
| 3745 | } |
| 3746 | else if (g_func_pp->arg[i].type.is_retreg) { |
| 3747 | fprintf(fout, "u32 *r_%s", g_func_pp->arg[i].reg); |
| 3748 | } |
| 3749 | else { |
| 3750 | fprintf(fout, "%s a%d", g_func_pp->arg[i].type.name, i + 1); |
| 3751 | } |
| 3752 | } |
| 3753 | if (g_func_pp->is_vararg) { |
| 3754 | if (i > 0) |
| 3755 | fprintf(fout, ", "); |
| 3756 | fprintf(fout, "..."); |
| 3757 | } |
| 3758 | |
| 3759 | fprintf(fout, ")\n{\n"); |
| 3760 | |
| 3761 | // declare indirect functions |
| 3762 | for (i = 0; i < opcnt; i++) { |
| 3763 | po = &ops[i]; |
| 3764 | if (po->flags & OPF_RMD) |
| 3765 | continue; |
| 3766 | |
| 3767 | if (po->op == OP_CALL) { |
| 3768 | pp = po->pp; |
| 3769 | if (pp == NULL) |
| 3770 | ferr(po, "NULL pp\n"); |
| 3771 | |
| 3772 | if (pp->is_fptr && !(pp->name[0] != 0 && pp->is_arg)) { |
| 3773 | if (pp->name[0] != 0) { |
| 3774 | memmove(pp->name + 2, pp->name, strlen(pp->name) + 1); |
| 3775 | memcpy(pp->name, "i_", 2); |
| 3776 | |
| 3777 | // might be declared already |
| 3778 | found = 0; |
| 3779 | for (j = 0; j < i; j++) { |
| 3780 | if (ops[j].op == OP_CALL && (pp_tmp = ops[j].pp)) { |
| 3781 | if (pp_tmp->is_fptr && IS(pp->name, pp_tmp->name)) { |
| 3782 | found = 1; |
| 3783 | break; |
| 3784 | } |
| 3785 | } |
| 3786 | } |
| 3787 | if (found) |
| 3788 | continue; |
| 3789 | } |
| 3790 | else |
| 3791 | snprintf(pp->name, sizeof(pp->name), "icall%d", i); |
| 3792 | |
| 3793 | fprintf(fout, " %s (", pp->ret_type.name); |
| 3794 | output_pp_attrs(fout, pp, 0); |
| 3795 | fprintf(fout, "*%s)(", pp->name); |
| 3796 | for (j = 0; j < pp->argc; j++) { |
| 3797 | if (j > 0) |
| 3798 | fprintf(fout, ", "); |
| 3799 | fprintf(fout, "%s a%d", pp->arg[j].type.name, j + 1); |
| 3800 | } |
| 3801 | fprintf(fout, ");\n"); |
| 3802 | } |
| 3803 | } |
| 3804 | } |
| 3805 | |
| 3806 | // output LUTs/jumptables |
| 3807 | for (i = 0; i < g_func_pd_cnt; i++) { |
| 3808 | pd = &g_func_pd[i]; |
| 3809 | fprintf(fout, " static const "); |
| 3810 | if (pd->type == OPT_OFFSET) { |
| 3811 | fprintf(fout, "void *jt_%s[] =\n { ", pd->label); |
| 3812 | |
| 3813 | for (j = 0; j < pd->count; j++) { |
| 3814 | if (j > 0) |
| 3815 | fprintf(fout, ", "); |
| 3816 | fprintf(fout, "&&%s", pd->d[j].u.label); |
| 3817 | } |
| 3818 | } |
| 3819 | else { |
| 3820 | fprintf(fout, "%s %s[] =\n { ", |
| 3821 | lmod_type_u(ops, pd->lmod), pd->label); |
| 3822 | |
| 3823 | for (j = 0; j < pd->count; j++) { |
| 3824 | if (j > 0) |
| 3825 | fprintf(fout, ", "); |
| 3826 | fprintf(fout, "%u", pd->d[j].u.val); |
| 3827 | } |
| 3828 | } |
| 3829 | fprintf(fout, " };\n"); |
| 3830 | had_decl = 1; |
| 3831 | } |
| 3832 | |
| 3833 | // declare stack frame, va_arg |
| 3834 | if (g_stack_fsz) { |
| 3835 | fprintf(fout, " union { u32 d[%d]; u16 w[%d]; u8 b[%d]; } sf;\n", |
| 3836 | (g_stack_fsz + 3) / 4, (g_stack_fsz + 1) / 2, g_stack_fsz); |
| 3837 | had_decl = 1; |
| 3838 | } |
| 3839 | |
| 3840 | if (g_func_pp->is_userstack) { |
| 3841 | fprintf(fout, " u32 fake_sf[US_SZ_%s / 4];\n", g_func_pp->name); |
| 3842 | fprintf(fout, " u32 *esp = &fake_sf[sizeof(fake_sf) / 4];\n"); |
| 3843 | had_decl = 1; |
| 3844 | } |
| 3845 | |
| 3846 | if (g_func_pp->is_vararg) { |
| 3847 | fprintf(fout, " va_list ap;\n"); |
| 3848 | had_decl = 1; |
| 3849 | } |
| 3850 | |
| 3851 | // declare arg-registers |
| 3852 | for (i = 0; i < g_func_pp->argc; i++) { |
| 3853 | if (g_func_pp->arg[i].reg != NULL) { |
| 3854 | reg = char_array_i(regs_r32, |
| 3855 | ARRAY_SIZE(regs_r32), g_func_pp->arg[i].reg); |
| 3856 | if (regmask & (1 << reg)) { |
| 3857 | if (g_func_pp->arg[i].type.is_retreg) |
| 3858 | fprintf(fout, " u32 %s = *r_%s;\n", |
| 3859 | g_func_pp->arg[i].reg, g_func_pp->arg[i].reg); |
| 3860 | else |
| 3861 | fprintf(fout, " u32 %s = (u32)a%d;\n", |
| 3862 | g_func_pp->arg[i].reg, i + 1); |
| 3863 | } |
| 3864 | else { |
| 3865 | if (g_func_pp->arg[i].type.is_retreg) |
| 3866 | ferr(ops, "retreg '%s' is unused?\n", |
| 3867 | g_func_pp->arg[i].reg); |
| 3868 | fprintf(fout, " // %s = a%d; // unused\n", |
| 3869 | g_func_pp->arg[i].reg, i + 1); |
| 3870 | } |
| 3871 | had_decl = 1; |
| 3872 | } |
| 3873 | } |
| 3874 | |
| 3875 | regmask_now = regmask & ~regmask_arg; |
| 3876 | regmask_now &= ~(1 << xSP); |
| 3877 | if (regmask_now) { |
| 3878 | for (reg = 0; reg < 8; reg++) { |
| 3879 | if (regmask_now & (1 << reg)) { |
| 3880 | fprintf(fout, " u32 %s", regs_r32[reg]); |
| 3881 | if (regmask_init & (1 << reg)) |
| 3882 | fprintf(fout, " = 0"); |
| 3883 | fprintf(fout, ";\n"); |
| 3884 | had_decl = 1; |
| 3885 | } |
| 3886 | } |
| 3887 | } |
| 3888 | |
| 3889 | if (regmask_save) { |
| 3890 | for (reg = 0; reg < 8; reg++) { |
| 3891 | if (regmask_save & (1 << reg)) { |
| 3892 | fprintf(fout, " u32 s_%s;\n", regs_r32[reg]); |
| 3893 | had_decl = 1; |
| 3894 | } |
| 3895 | } |
| 3896 | } |
| 3897 | |
| 3898 | if (save_arg_vars) { |
| 3899 | for (reg = 0; reg < 32; reg++) { |
| 3900 | if (save_arg_vars & (1 << reg)) { |
| 3901 | fprintf(fout, " u32 s_a%d;\n", reg + 1); |
| 3902 | had_decl = 1; |
| 3903 | } |
| 3904 | } |
| 3905 | } |
| 3906 | |
| 3907 | if (cond_vars) { |
| 3908 | for (i = 0; i < 8; i++) { |
| 3909 | if (cond_vars & (1 << i)) { |
| 3910 | fprintf(fout, " u32 cond_%s;\n", parsed_flag_op_names[i]); |
| 3911 | had_decl = 1; |
| 3912 | } |
| 3913 | } |
| 3914 | } |
| 3915 | |
| 3916 | if (need_tmp_var) { |
| 3917 | fprintf(fout, " u32 tmp;\n"); |
| 3918 | had_decl = 1; |
| 3919 | } |
| 3920 | |
| 3921 | if (need_tmp64) { |
| 3922 | fprintf(fout, " u64 tmp64;\n"); |
| 3923 | had_decl = 1; |
| 3924 | } |
| 3925 | |
| 3926 | if (had_decl) |
| 3927 | fprintf(fout, "\n"); |
| 3928 | |
| 3929 | if (g_func_pp->is_vararg) { |
| 3930 | if (g_func_pp->argc_stack == 0) |
| 3931 | ferr(ops, "vararg func without stack args?\n"); |
| 3932 | fprintf(fout, " va_start(ap, a%d);\n", g_func_pp->argc); |
| 3933 | } |
| 3934 | |
| 3935 | // output ops |
| 3936 | for (i = 0; i < opcnt; i++) |
| 3937 | { |
| 3938 | if (g_labels[i][0] != 0) { |
| 3939 | fprintf(fout, "\n%s:\n", g_labels[i]); |
| 3940 | label_pending = 1; |
| 3941 | |
| 3942 | delayed_flag_op = NULL; |
| 3943 | last_arith_dst = NULL; |
| 3944 | } |
| 3945 | |
| 3946 | po = &ops[i]; |
| 3947 | if (po->flags & OPF_RMD) |
| 3948 | continue; |
| 3949 | |
| 3950 | no_output = 0; |
| 3951 | |
| 3952 | #define assert_operand_cnt(n_) \ |
| 3953 | if (po->operand_cnt != n_) \ |
| 3954 | ferr(po, "operand_cnt is %d/%d\n", po->operand_cnt, n_) |
| 3955 | |
| 3956 | // conditional/flag using op? |
| 3957 | if (po->flags & OPF_CC) |
| 3958 | { |
| 3959 | int is_delayed = 0; |
| 3960 | |
| 3961 | tmp_op = po->datap; |
| 3962 | |
| 3963 | // we go through all this trouble to avoid using parsed_flag_op, |
| 3964 | // which makes generated code much nicer |
| 3965 | if (delayed_flag_op != NULL) |
| 3966 | { |
| 3967 | out_cmp_test(buf1, sizeof(buf1), delayed_flag_op, |
| 3968 | po->pfo, po->pfo_inv); |
| 3969 | is_delayed = 1; |
| 3970 | } |
| 3971 | else if (last_arith_dst != NULL |
| 3972 | && (po->pfo == PFO_Z || po->pfo == PFO_S || po->pfo == PFO_P |
| 3973 | || (tmp_op && (tmp_op->op == OP_AND || tmp_op->op == OP_OR)) |
| 3974 | )) |
| 3975 | { |
| 3976 | out_src_opr_u32(buf3, sizeof(buf3), po, last_arith_dst); |
| 3977 | out_test_for_cc(buf1, sizeof(buf1), po, po->pfo, po->pfo_inv, |
| 3978 | last_arith_dst->lmod, buf3); |
| 3979 | is_delayed = 1; |
| 3980 | } |
| 3981 | else if (tmp_op != NULL) { |
| 3982 | // use preprocessed flag calc results |
| 3983 | if (!(tmp_op->pfomask & (1 << po->pfo))) |
| 3984 | ferr(po, "not prepared for pfo %d\n", po->pfo); |
| 3985 | |
| 3986 | // note: pfo_inv was not yet applied |
| 3987 | snprintf(buf1, sizeof(buf1), "(%scond_%s)", |
| 3988 | po->pfo_inv ? "!" : "", parsed_flag_op_names[po->pfo]); |
| 3989 | } |
| 3990 | else { |
| 3991 | ferr(po, "all methods of finding comparison failed\n"); |
| 3992 | } |
| 3993 | |
| 3994 | if (po->flags & OPF_JMP) { |
| 3995 | fprintf(fout, " if %s", buf1); |
| 3996 | } |
| 3997 | else if (po->op == OP_RCL || po->op == OP_RCR |
| 3998 | || po->op == OP_ADC || po->op == OP_SBB) |
| 3999 | { |
| 4000 | if (is_delayed) |
| 4001 | fprintf(fout, " cond_%s = %s;\n", |
| 4002 | parsed_flag_op_names[po->pfo], buf1); |
| 4003 | } |
| 4004 | else if (po->flags & OPF_DATA) { // SETcc |
| 4005 | out_dst_opr(buf2, sizeof(buf2), po, &po->operand[0]); |
| 4006 | fprintf(fout, " %s = %s;", buf2, buf1); |
| 4007 | } |
| 4008 | else { |
| 4009 | ferr(po, "unhandled conditional op\n"); |
| 4010 | } |
| 4011 | } |
| 4012 | |
| 4013 | pfomask = po->pfomask; |
| 4014 | |
| 4015 | if (po->flags & (OPF_REPZ|OPF_REPNZ)) { |
| 4016 | struct parsed_opr opr = {0,}; |
| 4017 | opr.type = OPT_REG; |
| 4018 | opr.reg = xCX; |
| 4019 | opr.lmod = OPLM_DWORD; |
| 4020 | ret = try_resolve_const(i, &opr, opcnt * 7 + i, &uval); |
| 4021 | |
| 4022 | if (ret != 1 || uval == 0) { |
| 4023 | // we need initial flags for ecx=0 case.. |
| 4024 | if (i > 0 && ops[i - 1].op == OP_XOR |
| 4025 | && IS(ops[i - 1].operand[0].name, |
| 4026 | ops[i - 1].operand[1].name)) |
| 4027 | { |
| 4028 | fprintf(fout, " cond_z = "); |
| 4029 | if (pfomask & (1 << PFO_C)) |
| 4030 | fprintf(fout, "cond_c = "); |
| 4031 | fprintf(fout, "0;\n"); |
| 4032 | } |
| 4033 | else if (last_arith_dst != NULL) { |
| 4034 | out_src_opr_u32(buf3, sizeof(buf3), po, last_arith_dst); |
| 4035 | out_test_for_cc(buf1, sizeof(buf1), po, PFO_Z, 0, |
| 4036 | last_arith_dst->lmod, buf3); |
| 4037 | fprintf(fout, " cond_z = %s;\n", buf1); |
| 4038 | } |
| 4039 | else |
| 4040 | ferr(po, "missing initial ZF\n"); |
| 4041 | } |
| 4042 | } |
| 4043 | |
| 4044 | switch (po->op) |
| 4045 | { |
| 4046 | case OP_MOV: |
| 4047 | assert_operand_cnt(2); |
| 4048 | propagate_lmod(po, &po->operand[0], &po->operand[1]); |
| 4049 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]); |
| 4050 | default_cast_to(buf3, sizeof(buf3), &po->operand[0]); |
| 4051 | fprintf(fout, " %s = %s;", buf1, |
| 4052 | out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], |
| 4053 | buf3, 0)); |
| 4054 | break; |
| 4055 | |
| 4056 | case OP_LEA: |
| 4057 | assert_operand_cnt(2); |
| 4058 | po->operand[1].lmod = OPLM_DWORD; // always |
| 4059 | fprintf(fout, " %s = %s;", |
| 4060 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]), |
| 4061 | out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], |
| 4062 | NULL, 1)); |
| 4063 | break; |
| 4064 | |
| 4065 | case OP_MOVZX: |
| 4066 | assert_operand_cnt(2); |
| 4067 | fprintf(fout, " %s = %s;", |
| 4068 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]), |
| 4069 | out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1])); |
| 4070 | break; |
| 4071 | |
| 4072 | case OP_MOVSX: |
| 4073 | assert_operand_cnt(2); |
| 4074 | switch (po->operand[1].lmod) { |
| 4075 | case OPLM_BYTE: |
| 4076 | strcpy(buf3, "(s8)"); |
| 4077 | break; |
| 4078 | case OPLM_WORD: |
| 4079 | strcpy(buf3, "(s16)"); |
| 4080 | break; |
| 4081 | default: |
| 4082 | ferr(po, "invalid src lmod: %d\n", po->operand[1].lmod); |
| 4083 | } |
| 4084 | fprintf(fout, " %s = %s;", |
| 4085 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]), |
| 4086 | out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], |
| 4087 | buf3, 0)); |
| 4088 | break; |
| 4089 | |
| 4090 | case OP_XCHG: |
| 4091 | assert_operand_cnt(2); |
| 4092 | propagate_lmod(po, &po->operand[0], &po->operand[1]); |
| 4093 | fprintf(fout, " tmp = %s;", |
| 4094 | out_src_opr(buf1, sizeof(buf1), po, &po->operand[0], "", 0)); |
| 4095 | fprintf(fout, " %s = %s;", |
| 4096 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]), |
| 4097 | out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], |
| 4098 | default_cast_to(buf3, sizeof(buf3), &po->operand[0]), 0)); |
| 4099 | fprintf(fout, " %s = %stmp;", |
| 4100 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[1]), |
| 4101 | default_cast_to(buf3, sizeof(buf3), &po->operand[1])); |
| 4102 | snprintf(g_comment, sizeof(g_comment), "xchg"); |
| 4103 | break; |
| 4104 | |
| 4105 | case OP_NOT: |
| 4106 | assert_operand_cnt(1); |
| 4107 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]); |
| 4108 | fprintf(fout, " %s = ~%s;", buf1, buf1); |
| 4109 | break; |
| 4110 | |
| 4111 | case OP_CDQ: |
| 4112 | assert_operand_cnt(2); |
| 4113 | fprintf(fout, " %s = (s32)%s >> 31;", |
| 4114 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]), |
| 4115 | out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1])); |
| 4116 | strcpy(g_comment, "cdq"); |
| 4117 | break; |
| 4118 | |
| 4119 | case OP_LODS: |
| 4120 | assert_operand_cnt(3); |
| 4121 | if (po->flags & OPF_REP) { |
| 4122 | // hmh.. |
| 4123 | ferr(po, "TODO\n"); |
| 4124 | } |
| 4125 | else { |
| 4126 | fprintf(fout, " eax = %sesi; esi %c= %d;", |
| 4127 | lmod_cast_u_ptr(po, po->operand[0].lmod), |
| 4128 | (po->flags & OPF_DF) ? '-' : '+', |
| 4129 | lmod_bytes(po, po->operand[0].lmod)); |
| 4130 | strcpy(g_comment, "lods"); |
| 4131 | } |
| 4132 | break; |
| 4133 | |
| 4134 | case OP_STOS: |
| 4135 | assert_operand_cnt(3); |
| 4136 | if (po->flags & OPF_REP) { |
| 4137 | fprintf(fout, " for (; ecx != 0; ecx--, edi %c= %d)\n", |
| 4138 | (po->flags & OPF_DF) ? '-' : '+', |
| 4139 | lmod_bytes(po, po->operand[0].lmod)); |
| 4140 | fprintf(fout, " %sedi = eax;", |
| 4141 | lmod_cast_u_ptr(po, po->operand[0].lmod)); |
| 4142 | strcpy(g_comment, "rep stos"); |
| 4143 | } |
| 4144 | else { |
| 4145 | fprintf(fout, " %sedi = eax; edi %c= %d;", |
| 4146 | lmod_cast_u_ptr(po, po->operand[0].lmod), |
| 4147 | (po->flags & OPF_DF) ? '-' : '+', |
| 4148 | lmod_bytes(po, po->operand[0].lmod)); |
| 4149 | strcpy(g_comment, "stos"); |
| 4150 | } |
| 4151 | break; |
| 4152 | |
| 4153 | case OP_MOVS: |
| 4154 | assert_operand_cnt(3); |
| 4155 | j = lmod_bytes(po, po->operand[0].lmod); |
| 4156 | strcpy(buf1, lmod_cast_u_ptr(po, po->operand[0].lmod)); |
| 4157 | l = (po->flags & OPF_DF) ? '-' : '+'; |
| 4158 | if (po->flags & OPF_REP) { |
| 4159 | fprintf(fout, |
| 4160 | " for (; ecx != 0; ecx--, edi %c= %d, esi %c= %d)\n", |
| 4161 | l, j, l, j); |
| 4162 | fprintf(fout, |
| 4163 | " %sedi = %sesi;", buf1, buf1); |
| 4164 | strcpy(g_comment, "rep movs"); |
| 4165 | } |
| 4166 | else { |
| 4167 | fprintf(fout, " %sedi = %sesi; edi %c= %d; esi %c= %d;", |
| 4168 | buf1, buf1, l, j, l, j); |
| 4169 | strcpy(g_comment, "movs"); |
| 4170 | } |
| 4171 | break; |
| 4172 | |
| 4173 | case OP_CMPS: |
| 4174 | // repe ~ repeat while ZF=1 |
| 4175 | assert_operand_cnt(3); |
| 4176 | j = lmod_bytes(po, po->operand[0].lmod); |
| 4177 | strcpy(buf1, lmod_cast_u_ptr(po, po->operand[0].lmod)); |
| 4178 | l = (po->flags & OPF_DF) ? '-' : '+'; |
| 4179 | if (po->flags & OPF_REP) { |
| 4180 | fprintf(fout, |
| 4181 | " for (; ecx != 0; ecx--) {\n"); |
| 4182 | if (pfomask & (1 << PFO_C)) { |
| 4183 | // ugh.. |
| 4184 | fprintf(fout, |
| 4185 | " cond_c = %sesi < %sedi;\n", buf1, buf1); |
| 4186 | pfomask &= ~(1 << PFO_C); |
| 4187 | } |
| 4188 | fprintf(fout, |
| 4189 | " cond_z = (%sesi == %sedi); esi %c= %d, edi %c= %d;\n", |
| 4190 | buf1, buf1, l, j, l, j); |
| 4191 | fprintf(fout, |
| 4192 | " if (cond_z %s 0) break;\n", |
| 4193 | (po->flags & OPF_REPZ) ? "==" : "!="); |
| 4194 | fprintf(fout, |
| 4195 | " }"); |
| 4196 | snprintf(g_comment, sizeof(g_comment), "rep%s cmps", |
| 4197 | (po->flags & OPF_REPZ) ? "e" : "ne"); |
| 4198 | } |
| 4199 | else { |
| 4200 | fprintf(fout, |
| 4201 | " cond_z = (%sesi == %sedi); esi %c= %d; edi %c= %d;", |
| 4202 | buf1, buf1, l, j, l, j); |
| 4203 | strcpy(g_comment, "cmps"); |
| 4204 | } |
| 4205 | pfomask &= ~(1 << PFO_Z); |
| 4206 | last_arith_dst = NULL; |
| 4207 | delayed_flag_op = NULL; |
| 4208 | break; |
| 4209 | |
| 4210 | case OP_SCAS: |
| 4211 | // only does ZF (for now) |
| 4212 | // repe ~ repeat while ZF=1 |
| 4213 | assert_operand_cnt(3); |
| 4214 | j = lmod_bytes(po, po->operand[0].lmod); |
| 4215 | l = (po->flags & OPF_DF) ? '-' : '+'; |
| 4216 | if (po->flags & OPF_REP) { |
| 4217 | fprintf(fout, |
| 4218 | " for (; ecx != 0; ecx--) {\n"); |
| 4219 | fprintf(fout, |
| 4220 | " cond_z = (%seax == %sedi); edi %c= %d;\n", |
| 4221 | lmod_cast_u(po, po->operand[0].lmod), |
| 4222 | lmod_cast_u_ptr(po, po->operand[0].lmod), l, j); |
| 4223 | fprintf(fout, |
| 4224 | " if (cond_z %s 0) break;\n", |
| 4225 | (po->flags & OPF_REPZ) ? "==" : "!="); |
| 4226 | fprintf(fout, |
| 4227 | " }"); |
| 4228 | snprintf(g_comment, sizeof(g_comment), "rep%s scas", |
| 4229 | (po->flags & OPF_REPZ) ? "e" : "ne"); |
| 4230 | } |
| 4231 | else { |
| 4232 | fprintf(fout, " cond_z = (%seax == %sedi); edi %c= %d;", |
| 4233 | lmod_cast_u(po, po->operand[0].lmod), |
| 4234 | lmod_cast_u_ptr(po, po->operand[0].lmod), l, j); |
| 4235 | strcpy(g_comment, "scas"); |
| 4236 | } |
| 4237 | pfomask &= ~(1 << PFO_Z); |
| 4238 | last_arith_dst = NULL; |
| 4239 | delayed_flag_op = NULL; |
| 4240 | break; |
| 4241 | |
| 4242 | // arithmetic w/flags |
| 4243 | case OP_AND: |
| 4244 | case OP_OR: |
| 4245 | propagate_lmod(po, &po->operand[0], &po->operand[1]); |
| 4246 | // fallthrough |
| 4247 | dualop_arith: |
| 4248 | assert_operand_cnt(2); |
| 4249 | fprintf(fout, " %s %s= %s;", |
| 4250 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]), |
| 4251 | op_to_c(po), |
| 4252 | out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1])); |
| 4253 | output_std_flags(fout, po, &pfomask, buf1); |
| 4254 | last_arith_dst = &po->operand[0]; |
| 4255 | delayed_flag_op = NULL; |
| 4256 | break; |
| 4257 | |
| 4258 | case OP_SHL: |
| 4259 | case OP_SHR: |
| 4260 | assert_operand_cnt(2); |
| 4261 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]); |
| 4262 | if (pfomask & (1 << PFO_C)) { |
| 4263 | if (po->operand[1].type == OPT_CONST) { |
| 4264 | l = lmod_bytes(po, po->operand[0].lmod) * 8; |
| 4265 | j = po->operand[1].val; |
| 4266 | j %= l; |
| 4267 | if (j != 0) { |
| 4268 | if (po->op == OP_SHL) |
| 4269 | j = l - j; |
| 4270 | else |
| 4271 | j -= 1; |
| 4272 | fprintf(fout, " cond_c = (%s >> %d) & 1;\n", |
| 4273 | buf1, j); |
| 4274 | } |
| 4275 | else |
| 4276 | ferr(po, "zero shift?\n"); |
| 4277 | } |
| 4278 | else |
| 4279 | ferr(po, "TODO\n"); |
| 4280 | pfomask &= ~(1 << PFO_C); |
| 4281 | } |
| 4282 | fprintf(fout, " %s %s= %s;", buf1, op_to_c(po), |
| 4283 | out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1])); |
| 4284 | output_std_flags(fout, po, &pfomask, buf1); |
| 4285 | last_arith_dst = &po->operand[0]; |
| 4286 | delayed_flag_op = NULL; |
| 4287 | break; |
| 4288 | |
| 4289 | case OP_SAR: |
| 4290 | assert_operand_cnt(2); |
| 4291 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]); |
| 4292 | fprintf(fout, " %s = %s%s >> %s;", buf1, |
| 4293 | lmod_cast_s(po, po->operand[0].lmod), buf1, |
| 4294 | out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1])); |
| 4295 | output_std_flags(fout, po, &pfomask, buf1); |
| 4296 | last_arith_dst = &po->operand[0]; |
| 4297 | delayed_flag_op = NULL; |
| 4298 | break; |
| 4299 | |
| 4300 | case OP_ROL: |
| 4301 | case OP_ROR: |
| 4302 | assert_operand_cnt(2); |
| 4303 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]); |
| 4304 | if (po->operand[1].type == OPT_CONST) { |
| 4305 | j = po->operand[1].val; |
| 4306 | j %= lmod_bytes(po, po->operand[0].lmod) * 8; |
| 4307 | fprintf(fout, po->op == OP_ROL ? |
| 4308 | " %s = (%s << %d) | (%s >> %d);" : |
| 4309 | " %s = (%s >> %d) | (%s << %d);", |
| 4310 | buf1, buf1, j, buf1, |
| 4311 | lmod_bytes(po, po->operand[0].lmod) * 8 - j); |
| 4312 | } |
| 4313 | else |
| 4314 | ferr(po, "TODO\n"); |
| 4315 | output_std_flags(fout, po, &pfomask, buf1); |
| 4316 | last_arith_dst = &po->operand[0]; |
| 4317 | delayed_flag_op = NULL; |
| 4318 | break; |
| 4319 | |
| 4320 | case OP_RCL: |
| 4321 | case OP_RCR: |
| 4322 | assert_operand_cnt(2); |
| 4323 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]); |
| 4324 | l = lmod_bytes(po, po->operand[0].lmod) * 8; |
| 4325 | if (po->operand[1].type == OPT_CONST) { |
| 4326 | j = po->operand[1].val % l; |
| 4327 | if (j == 0) |
| 4328 | ferr(po, "zero rotate\n"); |
| 4329 | fprintf(fout, " tmp = (%s >> %d) & 1;\n", |
| 4330 | buf1, (po->op == OP_RCL) ? (l - j) : (j - 1)); |
| 4331 | if (po->op == OP_RCL) { |
| 4332 | fprintf(fout, |
| 4333 | " %s = (%s << %d) | (cond_c << %d)", |
| 4334 | buf1, buf1, j, j - 1); |
| 4335 | if (j != 1) |
| 4336 | fprintf(fout, " | (%s >> %d)", buf1, l + 1 - j); |
| 4337 | } |
| 4338 | else { |
| 4339 | fprintf(fout, |
| 4340 | " %s = (%s >> %d) | (cond_c << %d)", |
| 4341 | buf1, buf1, j, l - j); |
| 4342 | if (j != 1) |
| 4343 | fprintf(fout, " | (%s << %d)", buf1, l + 1 - j); |
| 4344 | } |
| 4345 | fprintf(fout, ";\n"); |
| 4346 | fprintf(fout, " cond_c = tmp;"); |
| 4347 | } |
| 4348 | else |
| 4349 | ferr(po, "TODO\n"); |
| 4350 | strcpy(g_comment, (po->op == OP_RCL) ? "rcl" : "rcr"); |
| 4351 | output_std_flags(fout, po, &pfomask, buf1); |
| 4352 | last_arith_dst = &po->operand[0]; |
| 4353 | delayed_flag_op = NULL; |
| 4354 | break; |
| 4355 | |
| 4356 | case OP_XOR: |
| 4357 | assert_operand_cnt(2); |
| 4358 | propagate_lmod(po, &po->operand[0], &po->operand[1]); |
| 4359 | if (IS(opr_name(po, 0), opr_name(po, 1))) { |
| 4360 | // special case for XOR |
| 4361 | if (pfomask & (1 << PFO_BE)) { // weird, but it happens.. |
| 4362 | fprintf(fout, " cond_be = 1;\n"); |
| 4363 | pfomask &= ~(1 << PFO_BE); |
| 4364 | } |
| 4365 | fprintf(fout, " %s = 0;", |
| 4366 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0])); |
| 4367 | last_arith_dst = &po->operand[0]; |
| 4368 | delayed_flag_op = NULL; |
| 4369 | break; |
| 4370 | } |
| 4371 | goto dualop_arith; |
| 4372 | |
| 4373 | case OP_ADD: |
| 4374 | assert_operand_cnt(2); |
| 4375 | propagate_lmod(po, &po->operand[0], &po->operand[1]); |
| 4376 | if (pfomask & (1 << PFO_C)) { |
| 4377 | out_src_opr_u32(buf1, sizeof(buf1), po, &po->operand[0]); |
| 4378 | out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1]); |
| 4379 | if (po->operand[0].lmod == OPLM_DWORD) { |
| 4380 | fprintf(fout, " tmp64 = (u64)%s + %s;\n", buf1, buf2); |
| 4381 | fprintf(fout, " cond_c = tmp64 >> 32;\n"); |
| 4382 | fprintf(fout, " %s = (u32)tmp64;", |
| 4383 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0])); |
| 4384 | strcat(g_comment, "add64"); |
| 4385 | } |
| 4386 | else { |
| 4387 | fprintf(fout, " cond_c = ((u32)%s + %s) >> %d;\n", |
| 4388 | buf1, buf2, lmod_bytes(po, po->operand[0].lmod) * 8); |
| 4389 | fprintf(fout, " %s += %s;", |
| 4390 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]), |
| 4391 | buf2); |
| 4392 | } |
| 4393 | pfomask &= ~(1 << PFO_C); |
| 4394 | output_std_flags(fout, po, &pfomask, buf1); |
| 4395 | last_arith_dst = &po->operand[0]; |
| 4396 | delayed_flag_op = NULL; |
| 4397 | break; |
| 4398 | } |
| 4399 | goto dualop_arith; |
| 4400 | |
| 4401 | case OP_SUB: |
| 4402 | assert_operand_cnt(2); |
| 4403 | propagate_lmod(po, &po->operand[0], &po->operand[1]); |
| 4404 | if (pfomask & (1 << PFO_C)) { |
| 4405 | fprintf(fout, " cond_c = %s < %s;\n", |
| 4406 | out_src_opr_u32(buf1, sizeof(buf1), po, &po->operand[0]), |
| 4407 | out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1])); |
| 4408 | pfomask &= ~(1 << PFO_C); |
| 4409 | } |
| 4410 | goto dualop_arith; |
| 4411 | |
| 4412 | case OP_ADC: |
| 4413 | case OP_SBB: |
| 4414 | assert_operand_cnt(2); |
| 4415 | propagate_lmod(po, &po->operand[0], &po->operand[1]); |
| 4416 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]); |
| 4417 | if (po->op == OP_SBB |
| 4418 | && IS(po->operand[0].name, po->operand[1].name)) |
| 4419 | { |
| 4420 | // avoid use of unitialized var |
| 4421 | fprintf(fout, " %s = -cond_c;", buf1); |
| 4422 | // carry remains what it was |
| 4423 | pfomask &= ~(1 << PFO_C); |
| 4424 | } |
| 4425 | else { |
| 4426 | fprintf(fout, " %s %s= %s + cond_c;", buf1, op_to_c(po), |
| 4427 | out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1])); |
| 4428 | } |
| 4429 | output_std_flags(fout, po, &pfomask, buf1); |
| 4430 | last_arith_dst = &po->operand[0]; |
| 4431 | delayed_flag_op = NULL; |
| 4432 | break; |
| 4433 | |
| 4434 | case OP_BSF: |
| 4435 | assert_operand_cnt(2); |
| 4436 | out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1]); |
| 4437 | fprintf(fout, " %s = %s ? __builtin_ffs(%s) - 1 : 0;", |
| 4438 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]), |
| 4439 | buf2, buf2); |
| 4440 | output_std_flags(fout, po, &pfomask, buf1); |
| 4441 | last_arith_dst = &po->operand[0]; |
| 4442 | delayed_flag_op = NULL; |
| 4443 | strcat(g_comment, "bsf"); |
| 4444 | break; |
| 4445 | |
| 4446 | case OP_INC: |
| 4447 | case OP_DEC: |
| 4448 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]); |
| 4449 | if (po->operand[0].type == OPT_REG) { |
| 4450 | strcpy(buf2, po->op == OP_INC ? "++" : "--"); |
| 4451 | fprintf(fout, " %s%s;", buf1, buf2); |
| 4452 | } |
| 4453 | else { |
| 4454 | strcpy(buf2, po->op == OP_INC ? "+" : "-"); |
| 4455 | fprintf(fout, " %s %s= 1;", buf1, buf2); |
| 4456 | } |
| 4457 | output_std_flags(fout, po, &pfomask, buf1); |
| 4458 | last_arith_dst = &po->operand[0]; |
| 4459 | delayed_flag_op = NULL; |
| 4460 | break; |
| 4461 | |
| 4462 | case OP_NEG: |
| 4463 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]); |
| 4464 | out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[0]); |
| 4465 | fprintf(fout, " %s = -%s%s;", buf1, |
| 4466 | lmod_cast_s(po, po->operand[0].lmod), buf2); |
| 4467 | last_arith_dst = &po->operand[0]; |
| 4468 | delayed_flag_op = NULL; |
| 4469 | if (pfomask & (1 << PFO_C)) { |
| 4470 | fprintf(fout, "\n cond_c = (%s != 0);", buf1); |
| 4471 | pfomask &= ~(1 << PFO_C); |
| 4472 | } |
| 4473 | break; |
| 4474 | |
| 4475 | case OP_IMUL: |
| 4476 | if (po->operand_cnt == 2) { |
| 4477 | propagate_lmod(po, &po->operand[0], &po->operand[1]); |
| 4478 | goto dualop_arith; |
| 4479 | } |
| 4480 | if (po->operand_cnt == 3) |
| 4481 | ferr(po, "TODO imul3\n"); |
| 4482 | // fallthrough |
| 4483 | case OP_MUL: |
| 4484 | assert_operand_cnt(1); |
| 4485 | switch (po->operand[0].lmod) { |
| 4486 | case OPLM_DWORD: |
| 4487 | strcpy(buf1, po->op == OP_IMUL ? "(s64)(s32)" : "(u64)"); |
| 4488 | fprintf(fout, " tmp64 = %seax * %s%s;\n", buf1, buf1, |
| 4489 | out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[0])); |
| 4490 | fprintf(fout, " edx = tmp64 >> 32;\n"); |
| 4491 | fprintf(fout, " eax = tmp64;"); |
| 4492 | break; |
| 4493 | case OPLM_BYTE: |
| 4494 | strcpy(buf1, po->op == OP_IMUL ? "(s16)(s8)" : "(u16)(u8)"); |
| 4495 | fprintf(fout, " LOWORD(eax) = %seax * %s;", buf1, |
| 4496 | out_src_opr(buf2, sizeof(buf2), po, &po->operand[0], |
| 4497 | buf1, 0)); |
| 4498 | break; |
| 4499 | default: |
| 4500 | ferr(po, "TODO: unhandled mul type\n"); |
| 4501 | break; |
| 4502 | } |
| 4503 | last_arith_dst = NULL; |
| 4504 | delayed_flag_op = NULL; |
| 4505 | break; |
| 4506 | |
| 4507 | case OP_DIV: |
| 4508 | case OP_IDIV: |
| 4509 | assert_operand_cnt(1); |
| 4510 | if (po->operand[0].lmod != OPLM_DWORD) |
| 4511 | ferr(po, "unhandled lmod %d\n", po->operand[0].lmod); |
| 4512 | |
| 4513 | out_src_opr_u32(buf1, sizeof(buf1), po, &po->operand[0]); |
| 4514 | strcpy(buf2, lmod_cast(po, po->operand[0].lmod, |
| 4515 | po->op == OP_IDIV)); |
| 4516 | switch (po->operand[0].lmod) { |
| 4517 | case OPLM_DWORD: |
| 4518 | if (po->flags & OPF_32BIT) |
| 4519 | snprintf(buf3, sizeof(buf3), "%seax", buf2); |
| 4520 | else { |
| 4521 | fprintf(fout, " tmp64 = ((u64)edx << 32) | eax;\n"); |
| 4522 | snprintf(buf3, sizeof(buf3), "%stmp64", |
| 4523 | (po->op == OP_IDIV) ? "(s64)" : ""); |
| 4524 | } |
| 4525 | if (po->operand[0].type == OPT_REG |
| 4526 | && po->operand[0].reg == xDX) |
| 4527 | { |
| 4528 | fprintf(fout, " eax = %s / %s%s;", buf3, buf2, buf1); |
| 4529 | fprintf(fout, " edx = %s %% %s%s;\n", buf3, buf2, buf1); |
| 4530 | } |
| 4531 | else { |
| 4532 | fprintf(fout, " edx = %s %% %s%s;\n", buf3, buf2, buf1); |
| 4533 | fprintf(fout, " eax = %s / %s%s;", buf3, buf2, buf1); |
| 4534 | } |
| 4535 | break; |
| 4536 | default: |
| 4537 | ferr(po, "unhandled division type\n"); |
| 4538 | } |
| 4539 | last_arith_dst = NULL; |
| 4540 | delayed_flag_op = NULL; |
| 4541 | break; |
| 4542 | |
| 4543 | case OP_TEST: |
| 4544 | case OP_CMP: |
| 4545 | propagate_lmod(po, &po->operand[0], &po->operand[1]); |
| 4546 | if (pfomask != 0) { |
| 4547 | for (j = 0; j < 8; j++) { |
| 4548 | if (pfomask & (1 << j)) { |
| 4549 | out_cmp_test(buf1, sizeof(buf1), po, j, 0); |
| 4550 | fprintf(fout, " cond_%s = %s;", |
| 4551 | parsed_flag_op_names[j], buf1); |
| 4552 | } |
| 4553 | } |
| 4554 | pfomask = 0; |
| 4555 | } |
| 4556 | else |
| 4557 | no_output = 1; |
| 4558 | last_arith_dst = NULL; |
| 4559 | delayed_flag_op = po; |
| 4560 | break; |
| 4561 | |
| 4562 | case OP_SCC: |
| 4563 | // SETcc - should already be handled |
| 4564 | break; |
| 4565 | |
| 4566 | // note: we reuse OP_Jcc for SETcc, only flags differ |
| 4567 | case OP_JCC: |
| 4568 | fprintf(fout, "\n goto %s;", po->operand[0].name); |
| 4569 | break; |
| 4570 | |
| 4571 | case OP_JECXZ: |
| 4572 | fprintf(fout, " if (ecx == 0)\n"); |
| 4573 | fprintf(fout, " goto %s;", po->operand[0].name); |
| 4574 | strcat(g_comment, "jecxz"); |
| 4575 | break; |
| 4576 | |
| 4577 | case OP_JMP: |
| 4578 | assert_operand_cnt(1); |
| 4579 | last_arith_dst = NULL; |
| 4580 | delayed_flag_op = NULL; |
| 4581 | |
| 4582 | if (po->operand[0].type == OPT_REGMEM) { |
| 4583 | ret = sscanf(po->operand[0].name, "%[^[][%[^*]*4]", |
| 4584 | buf1, buf2); |
| 4585 | if (ret != 2) |
| 4586 | ferr(po, "parse failure for jmp '%s'\n", |
| 4587 | po->operand[0].name); |
| 4588 | fprintf(fout, " goto *jt_%s[%s];", buf1, buf2); |
| 4589 | break; |
| 4590 | } |
| 4591 | else if (po->operand[0].type != OPT_LABEL) |
| 4592 | ferr(po, "unhandled jmp type\n"); |
| 4593 | |
| 4594 | fprintf(fout, " goto %s;", po->operand[0].name); |
| 4595 | break; |
| 4596 | |
| 4597 | case OP_CALL: |
| 4598 | assert_operand_cnt(1); |
| 4599 | pp = po->pp; |
| 4600 | my_assert_not(pp, NULL); |
| 4601 | |
| 4602 | strcpy(buf3, " "); |
| 4603 | if (po->flags & OPF_CC) { |
| 4604 | // we treat conditional branch to another func |
| 4605 | // (yes such code exists..) as conditional tailcall |
| 4606 | strcat(buf3, " "); |
| 4607 | fprintf(fout, " {\n"); |
| 4608 | } |
| 4609 | |
| 4610 | if (pp->is_fptr && !pp->is_arg) { |
| 4611 | fprintf(fout, "%s%s = %s;\n", buf3, pp->name, |
| 4612 | out_src_opr(buf1, sizeof(buf1), po, &po->operand[0], |
| 4613 | "(void *)", 0)); |
| 4614 | if (pp->is_unresolved) |
| 4615 | fprintf(fout, "%sunresolved_call(\"%s:%d\", %s);\n", |
| 4616 | buf3, asmfn, po->asmln, pp->name); |
| 4617 | } |
| 4618 | |
| 4619 | fprintf(fout, "%s", buf3); |
| 4620 | if (strstr(pp->ret_type.name, "int64")) { |
| 4621 | if (po->flags & OPF_TAIL) |
| 4622 | ferr(po, "int64 and tail?\n"); |
| 4623 | fprintf(fout, "tmp64 = "); |
| 4624 | } |
| 4625 | else if (!IS(pp->ret_type.name, "void")) { |
| 4626 | if (po->flags & OPF_TAIL) { |
| 4627 | if (!IS(g_func_pp->ret_type.name, "void")) { |
| 4628 | fprintf(fout, "return "); |
| 4629 | if (g_func_pp->ret_type.is_ptr != pp->ret_type.is_ptr) |
| 4630 | fprintf(fout, "(%s)", g_func_pp->ret_type.name); |
| 4631 | } |
| 4632 | } |
| 4633 | else if (regmask & (1 << xAX)) { |
| 4634 | fprintf(fout, "eax = "); |
| 4635 | if (pp->ret_type.is_ptr) |
| 4636 | fprintf(fout, "(u32)"); |
| 4637 | } |
| 4638 | } |
| 4639 | |
| 4640 | if (pp->name[0] == 0) |
| 4641 | ferr(po, "missing pp->name\n"); |
| 4642 | fprintf(fout, "%s%s(", pp->name, |
| 4643 | pp->has_structarg ? "_sa" : ""); |
| 4644 | |
| 4645 | if (po->flags & OPF_ATAIL) { |
| 4646 | if (pp->argc_stack != g_func_pp->argc_stack |
| 4647 | || (pp->argc_stack > 0 |
| 4648 | && pp->is_stdcall != g_func_pp->is_stdcall)) |
| 4649 | ferr(po, "incompatible tailcall\n"); |
| 4650 | if (g_func_pp->has_retreg) |
| 4651 | ferr(po, "TODO: retreg+tailcall\n"); |
| 4652 | |
| 4653 | for (arg = j = 0; arg < pp->argc; arg++) { |
| 4654 | if (arg > 0) |
| 4655 | fprintf(fout, ", "); |
| 4656 | |
| 4657 | cast[0] = 0; |
| 4658 | if (pp->arg[arg].type.is_ptr) |
| 4659 | snprintf(cast, sizeof(cast), "(%s)", |
| 4660 | pp->arg[arg].type.name); |
| 4661 | |
| 4662 | if (pp->arg[arg].reg != NULL) { |
| 4663 | fprintf(fout, "%s%s", cast, pp->arg[arg].reg); |
| 4664 | continue; |
| 4665 | } |
| 4666 | // stack arg |
| 4667 | for (; j < g_func_pp->argc; j++) |
| 4668 | if (g_func_pp->arg[j].reg == NULL) |
| 4669 | break; |
| 4670 | fprintf(fout, "%sa%d", cast, j + 1); |
| 4671 | j++; |
| 4672 | } |
| 4673 | } |
| 4674 | else { |
| 4675 | for (arg = 0; arg < pp->argc; arg++) { |
| 4676 | if (arg > 0) |
| 4677 | fprintf(fout, ", "); |
| 4678 | |
| 4679 | cast[0] = 0; |
| 4680 | if (pp->arg[arg].type.is_ptr) |
| 4681 | snprintf(cast, sizeof(cast), "(%s)", |
| 4682 | pp->arg[arg].type.name); |
| 4683 | |
| 4684 | if (pp->arg[arg].reg != NULL) { |
| 4685 | if (pp->arg[arg].type.is_retreg) |
| 4686 | fprintf(fout, "&%s", pp->arg[arg].reg); |
| 4687 | else |
| 4688 | fprintf(fout, "%s%s", cast, pp->arg[arg].reg); |
| 4689 | continue; |
| 4690 | } |
| 4691 | |
| 4692 | // stack arg |
| 4693 | tmp_op = pp->arg[arg].datap; |
| 4694 | if (tmp_op == NULL) |
| 4695 | ferr(po, "parsed_op missing for arg%d\n", arg); |
| 4696 | |
| 4697 | if (tmp_op->flags & OPF_VAPUSH) { |
| 4698 | fprintf(fout, "ap"); |
| 4699 | } |
| 4700 | else if (tmp_op->p_argpass != 0) { |
| 4701 | fprintf(fout, "a%d", tmp_op->p_argpass); |
| 4702 | } |
| 4703 | else if (tmp_op->p_argnum != 0) { |
| 4704 | fprintf(fout, "%ss_a%d", cast, tmp_op->p_argnum); |
| 4705 | } |
| 4706 | else { |
| 4707 | fprintf(fout, "%s", |
| 4708 | out_src_opr(buf1, sizeof(buf1), |
| 4709 | tmp_op, &tmp_op->operand[0], cast, 0)); |
| 4710 | } |
| 4711 | } |
| 4712 | } |
| 4713 | fprintf(fout, ");"); |
| 4714 | |
| 4715 | if (strstr(pp->ret_type.name, "int64")) { |
| 4716 | fprintf(fout, "\n"); |
| 4717 | fprintf(fout, "%sedx = tmp64 >> 32;\n", buf3); |
| 4718 | fprintf(fout, "%seax = tmp64;", buf3); |
| 4719 | } |
| 4720 | |
| 4721 | if (pp->is_unresolved) { |
| 4722 | snprintf(buf2, sizeof(buf2), " unresolved %dreg", |
| 4723 | pp->argc_reg); |
| 4724 | strcat(g_comment, buf2); |
| 4725 | } |
| 4726 | |
| 4727 | if (po->flags & OPF_TAIL) { |
| 4728 | ret = 0; |
| 4729 | if (i == opcnt - 1 || pp->is_noreturn) |
| 4730 | ret = 0; |
| 4731 | else if (IS(pp->ret_type.name, "void")) |
| 4732 | ret = 1; |
| 4733 | else if (IS(g_func_pp->ret_type.name, "void")) |
| 4734 | ret = 1; |
| 4735 | // else already handled as 'return f()' |
| 4736 | |
| 4737 | if (ret) { |
| 4738 | if (!IS(g_func_pp->ret_type.name, "void")) { |
| 4739 | ferr(po, "int func -> void func tailcall?\n"); |
| 4740 | } |
| 4741 | else { |
| 4742 | fprintf(fout, "\n%sreturn;", buf3); |
| 4743 | strcat(g_comment, " ^ tailcall"); |
| 4744 | } |
| 4745 | } |
| 4746 | else |
| 4747 | strcat(g_comment, " tailcall"); |
| 4748 | } |
| 4749 | if (pp->is_noreturn) |
| 4750 | strcat(g_comment, " noreturn"); |
| 4751 | if ((po->flags & OPF_ATAIL) && pp->argc_stack > 0) |
| 4752 | strcat(g_comment, " argframe"); |
| 4753 | if (po->flags & OPF_CC) |
| 4754 | strcat(g_comment, " cond"); |
| 4755 | |
| 4756 | if (po->flags & OPF_CC) |
| 4757 | fprintf(fout, "\n }"); |
| 4758 | |
| 4759 | delayed_flag_op = NULL; |
| 4760 | last_arith_dst = NULL; |
| 4761 | break; |
| 4762 | |
| 4763 | case OP_RET: |
| 4764 | if (g_func_pp->is_vararg) |
| 4765 | fprintf(fout, " va_end(ap);\n"); |
| 4766 | if (g_func_pp->has_retreg) { |
| 4767 | for (arg = 0; arg < g_func_pp->argc; arg++) |
| 4768 | if (g_func_pp->arg[arg].type.is_retreg) |
| 4769 | fprintf(fout, " *r_%s = %s;\n", |
| 4770 | g_func_pp->arg[arg].reg, g_func_pp->arg[arg].reg); |
| 4771 | } |
| 4772 | |
| 4773 | if (IS(g_func_pp->ret_type.name, "void")) { |
| 4774 | if (i != opcnt - 1 || label_pending) |
| 4775 | fprintf(fout, " return;"); |
| 4776 | } |
| 4777 | else if (g_func_pp->ret_type.is_ptr) { |
| 4778 | fprintf(fout, " return (%s)eax;", |
| 4779 | g_func_pp->ret_type.name); |
| 4780 | } |
| 4781 | else if (IS(g_func_pp->ret_type.name, "__int64")) |
| 4782 | fprintf(fout, " return ((u64)edx << 32) | eax;"); |
| 4783 | else |
| 4784 | fprintf(fout, " return eax;"); |
| 4785 | |
| 4786 | last_arith_dst = NULL; |
| 4787 | delayed_flag_op = NULL; |
| 4788 | break; |
| 4789 | |
| 4790 | case OP_PUSH: |
| 4791 | out_src_opr_u32(buf1, sizeof(buf1), po, &po->operand[0]); |
| 4792 | if (po->p_argnum != 0) { |
| 4793 | // special case - saved func arg |
| 4794 | fprintf(fout, " s_a%d = %s;", po->p_argnum, buf1); |
| 4795 | break; |
| 4796 | } |
| 4797 | else if (po->flags & OPF_RSAVE) { |
| 4798 | fprintf(fout, " s_%s = %s;", buf1, buf1); |
| 4799 | break; |
| 4800 | } |
| 4801 | else if (g_func_pp->is_userstack) { |
| 4802 | fprintf(fout, " *(--esp) = %s;", buf1); |
| 4803 | break; |
| 4804 | } |
| 4805 | if (!(g_ida_func_attr & IDAFA_NORETURN)) |
| 4806 | ferr(po, "stray push encountered\n"); |
| 4807 | no_output = 1; |
| 4808 | break; |
| 4809 | |
| 4810 | case OP_POP: |
| 4811 | if (po->flags & OPF_RSAVE) { |
| 4812 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]); |
| 4813 | fprintf(fout, " %s = s_%s;", buf1, buf1); |
| 4814 | break; |
| 4815 | } |
| 4816 | else if (po->datap != NULL) { |
| 4817 | // push/pop pair |
| 4818 | tmp_op = po->datap; |
| 4819 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]); |
| 4820 | fprintf(fout, " %s = %s;", buf1, |
| 4821 | out_src_opr(buf2, sizeof(buf2), |
| 4822 | tmp_op, &tmp_op->operand[0], |
| 4823 | default_cast_to(buf3, sizeof(buf3), &po->operand[0]), 0)); |
| 4824 | break; |
| 4825 | } |
| 4826 | else if (g_func_pp->is_userstack) { |
| 4827 | fprintf(fout, " %s = *esp++;", |
| 4828 | out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0])); |
| 4829 | break; |
| 4830 | } |
| 4831 | else |
| 4832 | ferr(po, "stray pop encountered\n"); |
| 4833 | break; |
| 4834 | |
| 4835 | case OP_NOP: |
| 4836 | no_output = 1; |
| 4837 | break; |
| 4838 | |
| 4839 | default: |
| 4840 | no_output = 1; |
| 4841 | ferr(po, "unhandled op type %d, flags %x\n", |
| 4842 | po->op, po->flags); |
| 4843 | break; |
| 4844 | } |
| 4845 | |
| 4846 | if (g_comment[0] != 0) { |
| 4847 | char *p = g_comment; |
| 4848 | while (my_isblank(*p)) |
| 4849 | p++; |
| 4850 | fprintf(fout, " // %s", p); |
| 4851 | g_comment[0] = 0; |
| 4852 | no_output = 0; |
| 4853 | } |
| 4854 | if (!no_output) |
| 4855 | fprintf(fout, "\n"); |
| 4856 | |
| 4857 | // some sanity checking |
| 4858 | if (po->flags & OPF_REP) { |
| 4859 | if (po->op != OP_STOS && po->op != OP_MOVS |
| 4860 | && po->op != OP_CMPS && po->op != OP_SCAS) |
| 4861 | ferr(po, "unexpected rep\n"); |
| 4862 | if (!(po->flags & (OPF_REPZ|OPF_REPNZ)) |
| 4863 | && (po->op == OP_CMPS || po->op == OP_SCAS)) |
| 4864 | ferr(po, "cmps/scas with plain rep\n"); |
| 4865 | } |
| 4866 | if ((po->flags & (OPF_REPZ|OPF_REPNZ)) |
| 4867 | && po->op != OP_CMPS && po->op != OP_SCAS) |
| 4868 | ferr(po, "unexpected repz/repnz\n"); |
| 4869 | |
| 4870 | if (pfomask != 0) |
| 4871 | ferr(po, "missed flag calc, pfomask=%x\n", pfomask); |
| 4872 | |
| 4873 | // see is delayed flag stuff is still valid |
| 4874 | if (delayed_flag_op != NULL && delayed_flag_op != po) { |
| 4875 | if (is_any_opr_modified(delayed_flag_op, po, 0)) |
| 4876 | delayed_flag_op = NULL; |
| 4877 | } |
| 4878 | |
| 4879 | if (last_arith_dst != NULL && last_arith_dst != &po->operand[0]) { |
| 4880 | if (is_opr_modified(last_arith_dst, po)) |
| 4881 | last_arith_dst = NULL; |
| 4882 | } |
| 4883 | |
| 4884 | label_pending = 0; |
| 4885 | } |
| 4886 | |
| 4887 | if (g_stack_fsz && !g_stack_frame_used) |
| 4888 | fprintf(fout, " (void)sf;\n"); |
| 4889 | |
| 4890 | fprintf(fout, "}\n\n"); |
| 4891 | |
| 4892 | // cleanup |
| 4893 | for (i = 0; i < opcnt; i++) { |
| 4894 | struct label_ref *lr, *lr_del; |
| 4895 | |
| 4896 | lr = g_label_refs[i].next; |
| 4897 | while (lr != NULL) { |
| 4898 | lr_del = lr; |
| 4899 | lr = lr->next; |
| 4900 | free(lr_del); |
| 4901 | } |
| 4902 | g_label_refs[i].i = -1; |
| 4903 | g_label_refs[i].next = NULL; |
| 4904 | |
| 4905 | if (ops[i].op == OP_CALL) { |
| 4906 | if (ops[i].pp) |
| 4907 | proto_release(ops[i].pp); |
| 4908 | } |
| 4909 | } |
| 4910 | g_func_pp = NULL; |
| 4911 | } |
| 4912 | |
| 4913 | static void set_label(int i, const char *name) |
| 4914 | { |
| 4915 | const char *p; |
| 4916 | int len; |
| 4917 | |
| 4918 | len = strlen(name); |
| 4919 | p = strchr(name, ':'); |
| 4920 | if (p != NULL) |
| 4921 | len = p - name; |
| 4922 | |
| 4923 | if (len > sizeof(g_labels[0]) - 1) |
| 4924 | aerr("label '%s' too long: %d\n", name, len); |
| 4925 | if (g_labels[i][0] != 0 && !IS_START(g_labels[i], "algn_")) |
| 4926 | aerr("dupe label '%s' vs '%s'?\n", name, g_labels[i]); |
| 4927 | memcpy(g_labels[i], name, len); |
| 4928 | g_labels[i][len] = 0; |
| 4929 | } |
| 4930 | |
| 4931 | // '=' needs special treatment.. |
| 4932 | static char *next_word_s(char *w, size_t wsize, char *s) |
| 4933 | { |
| 4934 | size_t i; |
| 4935 | |
| 4936 | s = sskip(s); |
| 4937 | |
| 4938 | for (i = 0; i < wsize - 1; i++) { |
| 4939 | if (s[i] == 0 || my_isblank(s[i]) || (s[i] == '=' && i > 0)) |
| 4940 | break; |
| 4941 | w[i] = s[i]; |
| 4942 | } |
| 4943 | w[i] = 0; |
| 4944 | |
| 4945 | if (s[i] != 0 && !my_isblank(s[i]) && s[i] != '=') |
| 4946 | printf("warning: '%s' truncated\n", w); |
| 4947 | |
| 4948 | return s + i; |
| 4949 | } |
| 4950 | |
| 4951 | struct chunk_item { |
| 4952 | char *name; |
| 4953 | long fptr; |
| 4954 | int asmln; |
| 4955 | }; |
| 4956 | |
| 4957 | static struct chunk_item *func_chunks; |
| 4958 | static int func_chunk_cnt; |
| 4959 | static int func_chunk_alloc; |
| 4960 | |
| 4961 | static void add_func_chunk(FILE *fasm, const char *name, int line) |
| 4962 | { |
| 4963 | if (func_chunk_cnt >= func_chunk_alloc) { |
| 4964 | func_chunk_alloc *= 2; |
| 4965 | func_chunks = realloc(func_chunks, |
| 4966 | func_chunk_alloc * sizeof(func_chunks[0])); |
| 4967 | my_assert_not(func_chunks, NULL); |
| 4968 | } |
| 4969 | func_chunks[func_chunk_cnt].fptr = ftell(fasm); |
| 4970 | func_chunks[func_chunk_cnt].name = strdup(name); |
| 4971 | func_chunks[func_chunk_cnt].asmln = line; |
| 4972 | func_chunk_cnt++; |
| 4973 | } |
| 4974 | |
| 4975 | static int cmp_chunks(const void *p1, const void *p2) |
| 4976 | { |
| 4977 | const struct chunk_item *c1 = p1, *c2 = p2; |
| 4978 | return strcmp(c1->name, c2->name); |
| 4979 | } |
| 4980 | |
| 4981 | static int cmpstringp(const void *p1, const void *p2) |
| 4982 | { |
| 4983 | return strcmp(*(char * const *)p1, *(char * const *)p2); |
| 4984 | } |
| 4985 | |
| 4986 | static void scan_ahead(FILE *fasm) |
| 4987 | { |
| 4988 | char words[2][256]; |
| 4989 | char line[256]; |
| 4990 | long oldpos; |
| 4991 | int oldasmln; |
| 4992 | int wordc; |
| 4993 | char *p; |
| 4994 | int i; |
| 4995 | |
| 4996 | oldpos = ftell(fasm); |
| 4997 | oldasmln = asmln; |
| 4998 | |
| 4999 | while (fgets(line, sizeof(line), fasm)) |
| 5000 | { |
| 5001 | wordc = 0; |
| 5002 | asmln++; |
| 5003 | |
| 5004 | p = sskip(line); |
| 5005 | if (*p == 0) |
| 5006 | continue; |
| 5007 | |
| 5008 | if (*p == ';') |
| 5009 | { |
| 5010 | // get rid of random tabs |
| 5011 | for (i = 0; line[i] != 0; i++) |
| 5012 | if (line[i] == '\t') |
| 5013 | line[i] = ' '; |
| 5014 | |
| 5015 | if (p[2] == 'S' && IS_START(p, "; START OF FUNCTION CHUNK FOR ")) |
| 5016 | { |
| 5017 | p += 30; |
| 5018 | next_word(words[0], sizeof(words[0]), p); |
| 5019 | if (words[0][0] == 0) |
| 5020 | aerr("missing name for func chunk?\n"); |
| 5021 | |
| 5022 | add_func_chunk(fasm, words[0], asmln); |
| 5023 | } |
| 5024 | else if (IS_START(p, "; sctend")) |
| 5025 | break; |
| 5026 | |
| 5027 | continue; |
| 5028 | } // *p == ';' |
| 5029 | |
| 5030 | for (wordc = 0; wordc < ARRAY_SIZE(words); wordc++) { |
| 5031 | words[wordc][0] = 0; |
| 5032 | p = sskip(next_word_s(words[wordc], sizeof(words[0]), p)); |
| 5033 | if (*p == 0 || *p == ';') { |
| 5034 | wordc++; |
| 5035 | break; |
| 5036 | } |
| 5037 | } |
| 5038 | |
| 5039 | if (wordc == 2 && IS(words[1], "ends")) |
| 5040 | break; |
| 5041 | } |
| 5042 | |
| 5043 | fseek(fasm, oldpos, SEEK_SET); |
| 5044 | asmln = oldasmln; |
| 5045 | } |
| 5046 | |
| 5047 | int main(int argc, char *argv[]) |
| 5048 | { |
| 5049 | FILE *fout, *fasm, *frlist; |
| 5050 | struct parsed_data *pd = NULL; |
| 5051 | int pd_alloc = 0; |
| 5052 | char **rlist = NULL; |
| 5053 | int rlist_len = 0; |
| 5054 | int rlist_alloc = 0; |
| 5055 | int func_chunks_used = 0; |
| 5056 | int func_chunks_sorted = 0; |
| 5057 | int func_chunk_i = -1; |
| 5058 | long func_chunk_ret = 0; |
| 5059 | int func_chunk_ret_ln = 0; |
| 5060 | int scanned_ahead = 0; |
| 5061 | char line[256]; |
| 5062 | char words[20][256]; |
| 5063 | enum opr_lenmod lmod; |
| 5064 | char *sctproto = NULL; |
| 5065 | int in_func = 0; |
| 5066 | int pending_endp = 0; |
| 5067 | int skip_func = 0; |
| 5068 | int skip_warned = 0; |
| 5069 | int eq_alloc; |
| 5070 | int verbose = 0; |
| 5071 | int multi_seg = 0; |
| 5072 | int end = 0; |
| 5073 | int arg_out; |
| 5074 | int arg; |
| 5075 | int pi = 0; |
| 5076 | int i, j; |
| 5077 | int ret, len; |
| 5078 | char *p; |
| 5079 | int wordc; |
| 5080 | |
| 5081 | for (arg = 1; arg < argc; arg++) { |
| 5082 | if (IS(argv[arg], "-v")) |
| 5083 | verbose = 1; |
| 5084 | else if (IS(argv[arg], "-rf")) |
| 5085 | g_allow_regfunc = 1; |
| 5086 | else if (IS(argv[arg], "-m")) |
| 5087 | multi_seg = 1; |
| 5088 | else |
| 5089 | break; |
| 5090 | } |
| 5091 | |
| 5092 | if (argc < arg + 3) { |
| 5093 | printf("usage:\n%s [-v] [-rf] [-m] <.c> <.asm> <hdrf> [rlist]*\n", |
| 5094 | argv[0]); |
| 5095 | return 1; |
| 5096 | } |
| 5097 | |
| 5098 | arg_out = arg++; |
| 5099 | |
| 5100 | asmfn = argv[arg++]; |
| 5101 | fasm = fopen(asmfn, "r"); |
| 5102 | my_assert_not(fasm, NULL); |
| 5103 | |
| 5104 | hdrfn = argv[arg++]; |
| 5105 | g_fhdr = fopen(hdrfn, "r"); |
| 5106 | my_assert_not(g_fhdr, NULL); |
| 5107 | |
| 5108 | rlist_alloc = 64; |
| 5109 | rlist = malloc(rlist_alloc * sizeof(rlist[0])); |
| 5110 | my_assert_not(rlist, NULL); |
| 5111 | // needs special handling.. |
| 5112 | rlist[rlist_len++] = "__alloca_probe"; |
| 5113 | |
| 5114 | func_chunk_alloc = 32; |
| 5115 | func_chunks = malloc(func_chunk_alloc * sizeof(func_chunks[0])); |
| 5116 | my_assert_not(func_chunks, NULL); |
| 5117 | |
| 5118 | memset(words, 0, sizeof(words)); |
| 5119 | |
| 5120 | for (; arg < argc; arg++) { |
| 5121 | frlist = fopen(argv[arg], "r"); |
| 5122 | my_assert_not(frlist, NULL); |
| 5123 | |
| 5124 | while (fgets(line, sizeof(line), frlist)) { |
| 5125 | p = sskip(line); |
| 5126 | if (*p == 0 || *p == ';') |
| 5127 | continue; |
| 5128 | if (*p == '#') { |
| 5129 | if (IS_START(p, "#if 0") |
| 5130 | || (g_allow_regfunc && IS_START(p, "#if NO_REGFUNC"))) |
| 5131 | { |
| 5132 | skip_func = 1; |
| 5133 | } |
| 5134 | else if (IS_START(p, "#endif")) |
| 5135 | skip_func = 0; |
| 5136 | continue; |
| 5137 | } |
| 5138 | if (skip_func) |
| 5139 | continue; |
| 5140 | |
| 5141 | p = next_word(words[0], sizeof(words[0]), p); |
| 5142 | if (words[0][0] == 0) |
| 5143 | continue; |
| 5144 | |
| 5145 | if (rlist_len >= rlist_alloc) { |
| 5146 | rlist_alloc = rlist_alloc * 2 + 64; |
| 5147 | rlist = realloc(rlist, rlist_alloc * sizeof(rlist[0])); |
| 5148 | my_assert_not(rlist, NULL); |
| 5149 | } |
| 5150 | rlist[rlist_len++] = strdup(words[0]); |
| 5151 | } |
| 5152 | skip_func = 0; |
| 5153 | |
| 5154 | fclose(frlist); |
| 5155 | frlist = NULL; |
| 5156 | } |
| 5157 | |
| 5158 | if (rlist_len > 0) |
| 5159 | qsort(rlist, rlist_len, sizeof(rlist[0]), cmpstringp); |
| 5160 | |
| 5161 | fout = fopen(argv[arg_out], "w"); |
| 5162 | my_assert_not(fout, NULL); |
| 5163 | |
| 5164 | eq_alloc = 128; |
| 5165 | g_eqs = malloc(eq_alloc * sizeof(g_eqs[0])); |
| 5166 | my_assert_not(g_eqs, NULL); |
| 5167 | |
| 5168 | for (i = 0; i < ARRAY_SIZE(g_label_refs); i++) { |
| 5169 | g_label_refs[i].i = -1; |
| 5170 | g_label_refs[i].next = NULL; |
| 5171 | } |
| 5172 | |
| 5173 | while (fgets(line, sizeof(line), fasm)) |
| 5174 | { |
| 5175 | wordc = 0; |
| 5176 | asmln++; |
| 5177 | |
| 5178 | p = sskip(line); |
| 5179 | if (*p == 0) |
| 5180 | continue; |
| 5181 | |
| 5182 | // get rid of random tabs |
| 5183 | for (i = 0; line[i] != 0; i++) |
| 5184 | if (line[i] == '\t') |
| 5185 | line[i] = ' '; |
| 5186 | |
| 5187 | if (*p == ';') |
| 5188 | { |
| 5189 | if (p[2] == '=' && IS_START(p, "; =============== S U B")) |
| 5190 | goto do_pending_endp; // eww.. |
| 5191 | |
| 5192 | if (p[2] == 'A' && IS_START(p, "; Attributes:")) |
| 5193 | { |
| 5194 | static const char *attrs[] = { |
| 5195 | "bp-based frame", |
| 5196 | "library function", |
| 5197 | "static", |
| 5198 | "noreturn", |
| 5199 | "thunk", |
| 5200 | "fpd=", |
| 5201 | }; |
| 5202 | |
| 5203 | // parse IDA's attribute-list comment |
| 5204 | g_ida_func_attr = 0; |
| 5205 | p = sskip(p + 13); |
| 5206 | |
| 5207 | for (; *p != 0; p = sskip(p)) { |
| 5208 | for (i = 0; i < ARRAY_SIZE(attrs); i++) { |
| 5209 | if (!strncmp(p, attrs[i], strlen(attrs[i]))) { |
| 5210 | g_ida_func_attr |= 1 << i; |
| 5211 | p += strlen(attrs[i]); |
| 5212 | break; |
| 5213 | } |
| 5214 | } |
| 5215 | if (i == ARRAY_SIZE(attrs)) { |
| 5216 | anote("unparsed IDA attr: %s\n", p); |
| 5217 | break; |
| 5218 | } |
| 5219 | if (IS(attrs[i], "fpd=")) { |
| 5220 | p = next_word(words[0], sizeof(words[0]), p); |
| 5221 | // ignore for now.. |
| 5222 | } |
| 5223 | } |
| 5224 | } |
| 5225 | else if (p[2] == 'S' && IS_START(p, "; START OF FUNCTION CHUNK FOR ")) |
| 5226 | { |
| 5227 | p += 30; |
| 5228 | next_word(words[0], sizeof(words[0]), p); |
| 5229 | if (words[0][0] == 0) |
| 5230 | aerr("missing name for func chunk?\n"); |
| 5231 | |
| 5232 | if (!scanned_ahead) { |
| 5233 | add_func_chunk(fasm, words[0], asmln); |
| 5234 | func_chunks_sorted = 0; |
| 5235 | } |
| 5236 | } |
| 5237 | else if (p[2] == 'E' && IS_START(p, "; END OF FUNCTION CHUNK")) |
| 5238 | { |
| 5239 | if (func_chunk_i >= 0) { |
| 5240 | if (func_chunk_i < func_chunk_cnt |
| 5241 | && IS(func_chunks[func_chunk_i].name, g_func)) |
| 5242 | { |
| 5243 | // move on to next chunk |
| 5244 | ret = fseek(fasm, func_chunks[func_chunk_i].fptr, SEEK_SET); |
| 5245 | if (ret) |
| 5246 | aerr("seek failed for '%s' chunk #%d\n", |
| 5247 | g_func, func_chunk_i); |
| 5248 | asmln = func_chunks[func_chunk_i].asmln; |
| 5249 | func_chunk_i++; |
| 5250 | } |
| 5251 | else { |
| 5252 | if (func_chunk_ret == 0) |
| 5253 | aerr("no return from chunk?\n"); |
| 5254 | fseek(fasm, func_chunk_ret, SEEK_SET); |
| 5255 | asmln = func_chunk_ret_ln; |
| 5256 | func_chunk_ret = 0; |
| 5257 | pending_endp = 1; |
| 5258 | } |
| 5259 | } |
| 5260 | } |
| 5261 | else if (p[2] == 'F' && IS_START(p, "; FUNCTION CHUNK AT ")) { |
| 5262 | func_chunks_used = 1; |
| 5263 | p += 20; |
| 5264 | if (IS_START(g_func, "sub_")) { |
| 5265 | unsigned long addr = strtoul(p, NULL, 16); |
| 5266 | unsigned long f_addr = strtoul(g_func + 4, NULL, 16); |
| 5267 | if (addr > f_addr && !scanned_ahead) { |
| 5268 | anote("scan_ahead caused by '%s', addr %lx\n", |
| 5269 | g_func, addr); |
| 5270 | scan_ahead(fasm); |
| 5271 | scanned_ahead = 1; |
| 5272 | func_chunks_sorted = 0; |
| 5273 | } |
| 5274 | } |
| 5275 | } |
| 5276 | continue; |
| 5277 | } // *p == ';' |
| 5278 | |
| 5279 | parse_words: |
| 5280 | for (i = wordc; i < ARRAY_SIZE(words); i++) |
| 5281 | words[i][0] = 0; |
| 5282 | for (wordc = 0; wordc < ARRAY_SIZE(words); wordc++) { |
| 5283 | p = sskip(next_word_s(words[wordc], sizeof(words[0]), p)); |
| 5284 | if (*p == 0 || *p == ';') { |
| 5285 | wordc++; |
| 5286 | break; |
| 5287 | } |
| 5288 | } |
| 5289 | if (*p != 0 && *p != ';') |
| 5290 | aerr("too many words\n"); |
| 5291 | |
| 5292 | // alow asm patches in comments |
| 5293 | if (*p == ';') { |
| 5294 | if (IS_START(p, "; sctpatch:")) { |
| 5295 | p = sskip(p + 11); |
| 5296 | if (*p == 0 || *p == ';') |
| 5297 | continue; |
| 5298 | goto parse_words; // lame |
| 5299 | } |
| 5300 | if (IS_START(p, "; sctproto:")) { |
| 5301 | sctproto = strdup(p + 11); |
| 5302 | } |
| 5303 | else if (IS_START(p, "; sctend")) { |
| 5304 | end = 1; |
| 5305 | if (!pending_endp) |
| 5306 | break; |
| 5307 | } |
| 5308 | } |
| 5309 | |
| 5310 | if (wordc == 0) { |
| 5311 | // shouldn't happen |
| 5312 | awarn("wordc == 0?\n"); |
| 5313 | continue; |
| 5314 | } |
| 5315 | |
| 5316 | // don't care about this: |
| 5317 | if (words[0][0] == '.' |
| 5318 | || IS(words[0], "include") |
| 5319 | || IS(words[0], "assume") || IS(words[1], "segment") |
| 5320 | || IS(words[0], "align")) |
| 5321 | { |
| 5322 | continue; |
| 5323 | } |
| 5324 | |
| 5325 | do_pending_endp: |
| 5326 | // do delayed endp processing to collect switch jumptables |
| 5327 | if (pending_endp) { |
| 5328 | if (in_func && !skip_func && !end && wordc >= 2 |
| 5329 | && ((words[0][0] == 'd' && words[0][2] == 0) |
| 5330 | || (words[1][0] == 'd' && words[1][2] == 0))) |
| 5331 | { |
| 5332 | i = 1; |
| 5333 | if (words[1][0] == 'd' && words[1][2] == 0) { |
| 5334 | // label |
| 5335 | if (g_func_pd_cnt >= pd_alloc) { |
| 5336 | pd_alloc = pd_alloc * 2 + 16; |
| 5337 | g_func_pd = realloc(g_func_pd, |
| 5338 | sizeof(g_func_pd[0]) * pd_alloc); |
| 5339 | my_assert_not(g_func_pd, NULL); |
| 5340 | } |
| 5341 | pd = &g_func_pd[g_func_pd_cnt]; |
| 5342 | g_func_pd_cnt++; |
| 5343 | memset(pd, 0, sizeof(*pd)); |
| 5344 | strcpy(pd->label, words[0]); |
| 5345 | pd->type = OPT_CONST; |
| 5346 | pd->lmod = lmod_from_directive(words[1]); |
| 5347 | i = 2; |
| 5348 | } |
| 5349 | else { |
| 5350 | if (pd == NULL) { |
| 5351 | if (verbose) |
| 5352 | anote("skipping alignment byte?\n"); |
| 5353 | continue; |
| 5354 | } |
| 5355 | lmod = lmod_from_directive(words[0]); |
| 5356 | if (lmod != pd->lmod) |
| 5357 | aerr("lmod change? %d->%d\n", pd->lmod, lmod); |
| 5358 | } |
| 5359 | |
| 5360 | if (pd->count_alloc < pd->count + wordc) { |
| 5361 | pd->count_alloc = pd->count_alloc * 2 + 14 + wordc; |
| 5362 | pd->d = realloc(pd->d, sizeof(pd->d[0]) * pd->count_alloc); |
| 5363 | my_assert_not(pd->d, NULL); |
| 5364 | } |
| 5365 | for (; i < wordc; i++) { |
| 5366 | if (IS(words[i], "offset")) { |
| 5367 | pd->type = OPT_OFFSET; |
| 5368 | i++; |
| 5369 | } |
| 5370 | p = strchr(words[i], ','); |
| 5371 | if (p != NULL) |
| 5372 | *p = 0; |
| 5373 | if (pd->type == OPT_OFFSET) |
| 5374 | pd->d[pd->count].u.label = strdup(words[i]); |
| 5375 | else |
| 5376 | pd->d[pd->count].u.val = parse_number(words[i]); |
| 5377 | pd->d[pd->count].bt_i = -1; |
| 5378 | pd->count++; |
| 5379 | } |
| 5380 | continue; |
| 5381 | } |
| 5382 | |
| 5383 | if (in_func && !skip_func) |
| 5384 | gen_func(fout, g_fhdr, g_func, pi); |
| 5385 | |
| 5386 | pending_endp = 0; |
| 5387 | in_func = 0; |
| 5388 | g_ida_func_attr = 0; |
| 5389 | skip_warned = 0; |
| 5390 | skip_func = 0; |
| 5391 | g_func[0] = 0; |
| 5392 | func_chunks_used = 0; |
| 5393 | func_chunk_i = -1; |
| 5394 | if (pi != 0) { |
| 5395 | memset(&ops, 0, pi * sizeof(ops[0])); |
| 5396 | memset(g_labels, 0, pi * sizeof(g_labels[0])); |
| 5397 | pi = 0; |
| 5398 | } |
| 5399 | g_eqcnt = 0; |
| 5400 | for (i = 0; i < g_func_pd_cnt; i++) { |
| 5401 | pd = &g_func_pd[i]; |
| 5402 | if (pd->type == OPT_OFFSET) { |
| 5403 | for (j = 0; j < pd->count; j++) |
| 5404 | free(pd->d[j].u.label); |
| 5405 | } |
| 5406 | free(pd->d); |
| 5407 | pd->d = NULL; |
| 5408 | } |
| 5409 | g_func_pd_cnt = 0; |
| 5410 | pd = NULL; |
| 5411 | |
| 5412 | if (end) |
| 5413 | break; |
| 5414 | if (wordc == 0) |
| 5415 | continue; |
| 5416 | } |
| 5417 | |
| 5418 | if (IS(words[1], "proc")) { |
| 5419 | if (in_func) |
| 5420 | aerr("proc '%s' while in_func '%s'?\n", |
| 5421 | words[0], g_func); |
| 5422 | p = words[0]; |
| 5423 | if (bsearch(&p, rlist, rlist_len, sizeof(rlist[0]), cmpstringp)) |
| 5424 | skip_func = 1; |
| 5425 | strcpy(g_func, words[0]); |
| 5426 | set_label(0, words[0]); |
| 5427 | in_func = 1; |
| 5428 | continue; |
| 5429 | } |
| 5430 | |
| 5431 | if (IS(words[1], "endp")) |
| 5432 | { |
| 5433 | if (!in_func) |
| 5434 | aerr("endp '%s' while not in_func?\n", words[0]); |
| 5435 | if (!IS(g_func, words[0])) |
| 5436 | aerr("endp '%s' while in_func '%s'?\n", |
| 5437 | words[0], g_func); |
| 5438 | |
| 5439 | if ((g_ida_func_attr & IDAFA_THUNK) && pi == 1 |
| 5440 | && ops[0].op == OP_JMP && ops[0].operand[0].had_ds) |
| 5441 | { |
| 5442 | // import jump |
| 5443 | skip_func = 1; |
| 5444 | } |
| 5445 | |
| 5446 | if (!skip_func && func_chunks_used) { |
| 5447 | // start processing chunks |
| 5448 | struct chunk_item *ci, key = { g_func, 0 }; |
| 5449 | |
| 5450 | func_chunk_ret = ftell(fasm); |
| 5451 | func_chunk_ret_ln = asmln; |
| 5452 | if (!func_chunks_sorted) { |
| 5453 | qsort(func_chunks, func_chunk_cnt, |
| 5454 | sizeof(func_chunks[0]), cmp_chunks); |
| 5455 | func_chunks_sorted = 1; |
| 5456 | } |
| 5457 | ci = bsearch(&key, func_chunks, func_chunk_cnt, |
| 5458 | sizeof(func_chunks[0]), cmp_chunks); |
| 5459 | if (ci == NULL) |
| 5460 | aerr("'%s' needs chunks, but none found\n", g_func); |
| 5461 | func_chunk_i = ci - func_chunks; |
| 5462 | for (; func_chunk_i > 0; func_chunk_i--) |
| 5463 | if (!IS(func_chunks[func_chunk_i - 1].name, g_func)) |
| 5464 | break; |
| 5465 | |
| 5466 | ret = fseek(fasm, func_chunks[func_chunk_i].fptr, SEEK_SET); |
| 5467 | if (ret) |
| 5468 | aerr("seek failed for '%s' chunk #%d\n", g_func, func_chunk_i); |
| 5469 | asmln = func_chunks[func_chunk_i].asmln; |
| 5470 | func_chunk_i++; |
| 5471 | continue; |
| 5472 | } |
| 5473 | pending_endp = 1; |
| 5474 | continue; |
| 5475 | } |
| 5476 | |
| 5477 | if (wordc == 2 && IS(words[1], "ends")) { |
| 5478 | if (!multi_seg) { |
| 5479 | end = 1; |
| 5480 | if (pending_endp) |
| 5481 | goto do_pending_endp; |
| 5482 | break; |
| 5483 | } |
| 5484 | |
| 5485 | // scan for next text segment |
| 5486 | while (fgets(line, sizeof(line), fasm)) { |
| 5487 | asmln++; |
| 5488 | p = sskip(line); |
| 5489 | if (*p == 0 || *p == ';') |
| 5490 | continue; |
| 5491 | |
| 5492 | if (strstr(p, "segment para public 'CODE' use32")) |
| 5493 | break; |
| 5494 | } |
| 5495 | |
| 5496 | continue; |
| 5497 | } |
| 5498 | |
| 5499 | p = strchr(words[0], ':'); |
| 5500 | if (p != NULL) { |
| 5501 | set_label(pi, words[0]); |
| 5502 | continue; |
| 5503 | } |
| 5504 | |
| 5505 | if (!in_func || skip_func) { |
| 5506 | if (!skip_warned && !skip_func && g_labels[pi][0] != 0) { |
| 5507 | if (verbose) |
| 5508 | anote("skipping from '%s'\n", g_labels[pi]); |
| 5509 | skip_warned = 1; |
| 5510 | } |
| 5511 | g_labels[pi][0] = 0; |
| 5512 | continue; |
| 5513 | } |
| 5514 | |
| 5515 | if (wordc > 1 && IS(words[1], "=")) |
| 5516 | { |
| 5517 | if (wordc != 5) |
| 5518 | aerr("unhandled equ, wc=%d\n", wordc); |
| 5519 | if (g_eqcnt >= eq_alloc) { |
| 5520 | eq_alloc *= 2; |
| 5521 | g_eqs = realloc(g_eqs, eq_alloc * sizeof(g_eqs[0])); |
| 5522 | my_assert_not(g_eqs, NULL); |
| 5523 | } |
| 5524 | |
| 5525 | len = strlen(words[0]); |
| 5526 | if (len > sizeof(g_eqs[0].name) - 1) |
| 5527 | aerr("equ name too long: %d\n", len); |
| 5528 | strcpy(g_eqs[g_eqcnt].name, words[0]); |
| 5529 | |
| 5530 | if (!IS(words[3], "ptr")) |
| 5531 | aerr("unhandled equ\n"); |
| 5532 | if (IS(words[2], "dword")) |
| 5533 | g_eqs[g_eqcnt].lmod = OPLM_DWORD; |
| 5534 | else if (IS(words[2], "word")) |
| 5535 | g_eqs[g_eqcnt].lmod = OPLM_WORD; |
| 5536 | else if (IS(words[2], "byte")) |
| 5537 | g_eqs[g_eqcnt].lmod = OPLM_BYTE; |
| 5538 | else |
| 5539 | aerr("bad lmod: '%s'\n", words[2]); |
| 5540 | |
| 5541 | g_eqs[g_eqcnt].offset = parse_number(words[4]); |
| 5542 | g_eqcnt++; |
| 5543 | continue; |
| 5544 | } |
| 5545 | |
| 5546 | if (pi >= ARRAY_SIZE(ops)) |
| 5547 | aerr("too many ops\n"); |
| 5548 | |
| 5549 | parse_op(&ops[pi], words, wordc); |
| 5550 | |
| 5551 | if (sctproto != NULL) { |
| 5552 | if (ops[pi].op == OP_CALL || ops[pi].op == OP_JMP) |
| 5553 | ops[pi].datap = sctproto; |
| 5554 | sctproto = NULL; |
| 5555 | } |
| 5556 | pi++; |
| 5557 | } |
| 5558 | |
| 5559 | fclose(fout); |
| 5560 | fclose(fasm); |
| 5561 | fclose(g_fhdr); |
| 5562 | |
| 5563 | return 0; |
| 5564 | } |
| 5565 | |
| 5566 | // vim:ts=2:shiftwidth=2:expandtab |