| 1 | #include <stdio.h> |
| 2 | #include <stdlib.h> |
| 3 | #include <string.h> |
| 4 | |
| 5 | #include "my_assert.h" |
| 6 | #include "my_str.h" |
| 7 | |
| 8 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0])) |
| 9 | |
| 10 | static int find_protostr(char *dst, size_t dlen, FILE *fhdr, |
| 11 | const char *sym, int *pline) |
| 12 | { |
| 13 | int line = 0; |
| 14 | char *p; |
| 15 | |
| 16 | rewind(fhdr); |
| 17 | |
| 18 | while (fgets(dst, dlen, fhdr)) |
| 19 | { |
| 20 | line++; |
| 21 | if (strstr(dst, sym) != NULL) |
| 22 | break; |
| 23 | } |
| 24 | *pline = line; |
| 25 | |
| 26 | if (feof(fhdr)) |
| 27 | return -1; |
| 28 | |
| 29 | p = dst + strlen(dst); |
| 30 | for (p--; p > dst && my_isblank(*p); --p) |
| 31 | *p = 0; |
| 32 | |
| 33 | return 0; |
| 34 | } |
| 35 | |
| 36 | static int get_regparm(char *dst, size_t dlen, char *p) |
| 37 | { |
| 38 | int i, o; |
| 39 | |
| 40 | if (*p != '<') |
| 41 | return 0; |
| 42 | |
| 43 | for (o = 0, i = 1; o < dlen; i++) { |
| 44 | if (p[i] == 0) |
| 45 | return 0; |
| 46 | if (p[i] == '>') |
| 47 | break; |
| 48 | dst[o++] = p[i]; |
| 49 | } |
| 50 | dst[o] = 0; |
| 51 | return i + 1; |
| 52 | } |
| 53 | |
| 54 | // hmh.. |
| 55 | static const char *known_types[] = { |
| 56 | "char", |
| 57 | "unsigned __int8", |
| 58 | "int", |
| 59 | "signed int", |
| 60 | "unsigned int", |
| 61 | "void", |
| 62 | "BYTE", |
| 63 | "WORD", |
| 64 | "DWORD", |
| 65 | "HMODULE", |
| 66 | "HANDLE", |
| 67 | "HWND", |
| 68 | "LPCSTR", |
| 69 | "size_t", |
| 70 | "void *", |
| 71 | "const void *", |
| 72 | "FILE *", |
| 73 | }; |
| 74 | |
| 75 | static int check_type(const char *name) |
| 76 | { |
| 77 | int i, l; |
| 78 | |
| 79 | for (i = 0; i < ARRAY_SIZE(known_types); i++) { |
| 80 | l = strlen(known_types[i]); |
| 81 | if (strncmp(known_types[i], name, l) == 0) |
| 82 | return l; |
| 83 | } |
| 84 | |
| 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | static const char *hdrfn; |
| 89 | static int pline = 0; |
| 90 | |
| 91 | static int parse_protostr(char *protostr, char **reglist, int *cnt_out, |
| 92 | int *is_stdcall) |
| 93 | { |
| 94 | char regparm[16]; |
| 95 | char buf[256]; |
| 96 | int xarg = 0; |
| 97 | int ret; |
| 98 | char *p; |
| 99 | |
| 100 | p = protostr; |
| 101 | if (p[0] == '/' && p[1] == '/') { |
| 102 | //printf("warning: decl for sym '%s' is commented out\n", sym); |
| 103 | p = sskip(p + 2); |
| 104 | } |
| 105 | |
| 106 | ret = check_type(p); |
| 107 | if (ret <= 0) { |
| 108 | printf("%s:%d:%ld: unhandled return in '%s'\n", |
| 109 | hdrfn, pline, (p - protostr) + 1, protostr); |
| 110 | return 1; |
| 111 | } |
| 112 | p += ret; |
| 113 | p = sskip(p); |
| 114 | |
| 115 | p = next_word(buf, sizeof(buf), p); |
| 116 | p = sskip(p); |
| 117 | if (buf[0] == 0) { |
| 118 | printf("%s:%d:%ld: cconv missing\n", |
| 119 | hdrfn, pline, (p - protostr) + 1); |
| 120 | return 1; |
| 121 | } |
| 122 | if (strcmp(buf, "__cdecl") == 0) |
| 123 | *is_stdcall = 0; |
| 124 | else if (strcmp(buf, "__stdcall") == 0) |
| 125 | *is_stdcall = 1; |
| 126 | else if (strcmp(buf, "__userpurge") == 0) |
| 127 | *is_stdcall = 1; // in all cases seen.. |
| 128 | else if (strcmp(buf, "__usercall") == 0) |
| 129 | *is_stdcall = 0; // ..or is it? |
| 130 | else { |
| 131 | // TODO: __thiscall needs special handling (arg1~ecx) |
| 132 | printf("%s:%d:%ld: unhandled cconv: '%s'\n", |
| 133 | hdrfn, pline, (p - protostr) + 1, buf); |
| 134 | return 1; |
| 135 | } |
| 136 | |
| 137 | p = next_idt(buf, sizeof(buf), p); |
| 138 | p = sskip(p); |
| 139 | if (buf[0] == 0) { |
| 140 | printf("%s:%d:%ld: func name missing\n", |
| 141 | hdrfn, pline, (p - protostr) + 1); |
| 142 | return 1; |
| 143 | } |
| 144 | |
| 145 | ret = get_regparm(regparm, sizeof(regparm), p); |
| 146 | if (ret > 0) { |
| 147 | if (strcmp(regparm, "eax") && strcmp(regparm, "ax") |
| 148 | && strcmp(regparm, "al")) |
| 149 | { |
| 150 | printf("%s:%d:%ld: bad regparm: %s\n", |
| 151 | hdrfn, pline, (p - protostr) + 1, regparm); |
| 152 | return 1; |
| 153 | } |
| 154 | p += ret; |
| 155 | p = sskip(p); |
| 156 | } |
| 157 | |
| 158 | if (*p != '(') { |
| 159 | printf("%s:%d:%ld: '(' expected, got '%c'\n", |
| 160 | hdrfn, pline, (p - protostr) + 1, *p); |
| 161 | return 1; |
| 162 | } |
| 163 | p++; |
| 164 | |
| 165 | while (1) { |
| 166 | p = sskip(p); |
| 167 | if (*p == ')') |
| 168 | break; |
| 169 | if (*p == ',') |
| 170 | p = sskip(p + 1); |
| 171 | |
| 172 | xarg++; |
| 173 | |
| 174 | ret = check_type(p); |
| 175 | if (ret <= 0) { |
| 176 | printf("%s:%d:%ld: unhandled type for arg%d\n", |
| 177 | hdrfn, pline, (p - protostr) + 1, xarg); |
| 178 | return 1; |
| 179 | } |
| 180 | p += ret; |
| 181 | p = sskip(p); |
| 182 | |
| 183 | p = next_idt(buf, sizeof(buf), p); |
| 184 | p = sskip(p); |
| 185 | #if 0 |
| 186 | if (buf[0] == 0) { |
| 187 | printf("%s:%d:%ld: idt missing for arg%d\n", |
| 188 | hdrfn, pline, (p - protostr) + 1, xarg); |
| 189 | return 1; |
| 190 | } |
| 191 | #endif |
| 192 | reglist[xarg - 1] = NULL; |
| 193 | |
| 194 | ret = get_regparm(regparm, sizeof(regparm), p); |
| 195 | if (ret > 0) { |
| 196 | p += ret; |
| 197 | p = sskip(p); |
| 198 | |
| 199 | reglist[xarg - 1] = strdup(regparm); |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | *cnt_out = xarg; |
| 204 | |
| 205 | return 0; |
| 206 | } |
| 207 | |
| 208 | static int is_x86_reg_saved(const char *reg) |
| 209 | { |
| 210 | static const char *nosave_regs[] = { "eax", "edx", "ecx" }; |
| 211 | int nosave = 0; |
| 212 | int r; |
| 213 | |
| 214 | for (r = 0; r < ARRAY_SIZE(nosave_regs); r++) |
| 215 | if (strcmp(reg, nosave_regs[r]) == 0) |
| 216 | nosave = 1; |
| 217 | |
| 218 | return !nosave; |
| 219 | } |
| 220 | |
| 221 | static void out_toasm_x86(FILE *f, char *sym, char *reg_list[], int reg_cnt, |
| 222 | int is_stdcall) |
| 223 | { |
| 224 | int have_normal = 0; // normal args |
| 225 | int have_regs = 0; |
| 226 | int must_save = 0; |
| 227 | int sarg_ofs = 1; // stack offset to args, in DWORDs |
| 228 | int args_repushed = 0; |
| 229 | int i; |
| 230 | |
| 231 | for (i = 0; i < reg_cnt; i++) { |
| 232 | if (reg_list[i] == NULL) { |
| 233 | have_normal++; |
| 234 | continue; |
| 235 | } |
| 236 | |
| 237 | have_regs++; |
| 238 | must_save |= is_x86_reg_saved(reg_list[i]); |
| 239 | } |
| 240 | |
| 241 | fprintf(f, ".global _asm_%s\n", sym); |
| 242 | fprintf(f, "_asm_%s:\n", sym); |
| 243 | |
| 244 | if (!have_regs && !is_stdcall) { |
| 245 | fprintf(f, "\tjmp %s\n\n", sym); |
| 246 | return; |
| 247 | } |
| 248 | |
| 249 | if (!have_normal && !must_save && !is_stdcall) { |
| 250 | // load arg regs |
| 251 | for (i = 0; i < reg_cnt; i++) { |
| 252 | fprintf(f, "\tmovl %d(%%esp), %%%s\n", |
| 253 | (i + sarg_ofs) * 4, reg_list[i]); |
| 254 | } |
| 255 | fprintf(f, "\tjmp %s\n\n", sym); |
| 256 | return; |
| 257 | } |
| 258 | |
| 259 | // save the regs |
| 260 | for (i = 0; i < reg_cnt; i++) { |
| 261 | if (reg_list[i] != NULL && is_x86_reg_saved(reg_list[i])) { |
| 262 | fprintf(f, "\tpushl %%%s\n", reg_list[i]); |
| 263 | sarg_ofs++; |
| 264 | } |
| 265 | } |
| 266 | |
| 267 | // reconstruct arg stack |
| 268 | for (i = reg_cnt - 1; i >= 0; i--) { |
| 269 | if (reg_list[i] == NULL) { |
| 270 | fprintf(f, "\tmovl %d(%%esp), %%eax\n", |
| 271 | (i + sarg_ofs) * 4); |
| 272 | fprintf(f, "\tpushl %%eax\n"); |
| 273 | sarg_ofs++; |
| 274 | args_repushed++; |
| 275 | } |
| 276 | } |
| 277 | my_assert(args_repushed, have_normal); |
| 278 | |
| 279 | // load arg regs |
| 280 | for (i = 0; i < reg_cnt; i++) { |
| 281 | if (reg_list[i] != NULL) { |
| 282 | fprintf(f, "\tmovl %d(%%esp), %%%s\n", |
| 283 | (i + sarg_ofs) * 4, reg_list[i]); |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | fprintf(f, "\n\t# %s\n", is_stdcall ? "__stdcall" : "__cdecl"); |
| 288 | fprintf(f, "\tcall %s\n\n", sym); |
| 289 | |
| 290 | if (args_repushed && !is_stdcall) |
| 291 | fprintf(f, "\tadd %d,%%esp\n", args_repushed * 4); |
| 292 | |
| 293 | // restore regs |
| 294 | for (i = reg_cnt - 1; i >= 0; i--) { |
| 295 | if (reg_list[i] != NULL && is_x86_reg_saved(reg_list[i])) |
| 296 | fprintf(f, "\tpopl %%%s\n", reg_list[i]); |
| 297 | } |
| 298 | |
| 299 | fprintf(f, "\tret\n\n"); |
| 300 | } |
| 301 | |
| 302 | static void out_fromasm_x86(FILE *f, char *sym, char *reg_list[], int reg_cnt, |
| 303 | int is_stdcall) |
| 304 | { |
| 305 | int have_normal = 0; // normal args |
| 306 | int have_regs = 0; |
| 307 | int sarg_ofs = 1; // stack offset to args, in DWORDs |
| 308 | int stack_args; |
| 309 | int i; |
| 310 | |
| 311 | for (i = 0; i < reg_cnt; i++) { |
| 312 | if (reg_list[i] == NULL) { |
| 313 | have_normal++; |
| 314 | continue; |
| 315 | } |
| 316 | |
| 317 | have_regs++; |
| 318 | } |
| 319 | |
| 320 | fprintf(f, "# %s\n", is_stdcall ? "__stdcall" : "__cdecl"); |
| 321 | fprintf(f, ".global %s\n", sym); |
| 322 | fprintf(f, "%s:\n", sym); |
| 323 | |
| 324 | if (!have_regs) { |
| 325 | fprintf(f, "\tjmp _%s\n\n", sym); |
| 326 | return; |
| 327 | } |
| 328 | |
| 329 | fprintf(f, "\tpushl %%edx\n"); // just in case.. |
| 330 | sarg_ofs++; |
| 331 | |
| 332 | // construct arg stack |
| 333 | stack_args = have_normal; |
| 334 | for (i = reg_cnt - 1; i >= 0; i--) { |
| 335 | if (reg_list[i] == NULL) { |
| 336 | fprintf(f, "\tmovl %d(%%esp), %%edx\n", |
| 337 | (sarg_ofs + stack_args - 1) * 4); |
| 338 | fprintf(f, "\tpushl %%edx\n"); |
| 339 | stack_args--; |
| 340 | } |
| 341 | else { |
| 342 | fprintf(f, "\tpushl %%%s\n", reg_list[i]); |
| 343 | } |
| 344 | sarg_ofs++; |
| 345 | } |
| 346 | |
| 347 | // no worries about calling conventions - always __cdecl |
| 348 | fprintf(f, "\n\tcall _%s\n\n", sym); |
| 349 | |
| 350 | if (sarg_ofs > 2) |
| 351 | fprintf(f, "\tadd %d,%%esp\n", (sarg_ofs - 2) * 4); |
| 352 | |
| 353 | fprintf(f, "\tpopl %%edx\n"); |
| 354 | |
| 355 | if (is_stdcall && have_normal) |
| 356 | fprintf(f, "\tret $%d\n\n", have_normal * 4); |
| 357 | else |
| 358 | fprintf(f, "\tret\n\n"); |
| 359 | } |
| 360 | |
| 361 | int main(int argc, char *argv[]) |
| 362 | { |
| 363 | FILE *fout, *fsyms_to, *fsyms_from, *fhdr; |
| 364 | char protostr[256]; |
| 365 | char line[256]; |
| 366 | char sym[256]; |
| 367 | char *reg_list[16]; |
| 368 | int is_stdcall = 0; |
| 369 | int reg_cnt = 0; |
| 370 | int ret; |
| 371 | |
| 372 | if (argc != 5) { |
| 373 | printf("usage:\n%s <bridge.s> <toasm_symf> <fromasm_symf> <hdrf>\n", |
| 374 | argv[0]); |
| 375 | return 1; |
| 376 | } |
| 377 | |
| 378 | hdrfn = argv[4]; |
| 379 | fhdr = fopen(hdrfn, "r"); |
| 380 | my_assert_not(fhdr, NULL); |
| 381 | |
| 382 | fsyms_from = fopen(argv[3], "r"); |
| 383 | my_assert_not(fsyms_from, NULL); |
| 384 | |
| 385 | fsyms_to = fopen(argv[2], "r"); |
| 386 | my_assert_not(fsyms_to, NULL); |
| 387 | |
| 388 | fout = fopen(argv[1], "w"); |
| 389 | my_assert_not(fout, NULL); |
| 390 | |
| 391 | fprintf(fout, ".text\n\n"); |
| 392 | fprintf(fout, "# to asm\n\n"); |
| 393 | |
| 394 | while (fgets(line, sizeof(line), fsyms_to)) |
| 395 | { |
| 396 | next_word(sym, sizeof(sym), line); |
| 397 | if (sym[0] == 0 || sym[0] == ';' || sym[0] == '#') |
| 398 | continue; |
| 399 | |
| 400 | ret = find_protostr(protostr, sizeof(protostr), fhdr, |
| 401 | sym, &pline); |
| 402 | if (ret != 0) { |
| 403 | printf("%s: sym '%s' is missing\n", |
| 404 | hdrfn, sym); |
| 405 | goto out; |
| 406 | } |
| 407 | |
| 408 | ret = parse_protostr(protostr, reg_list, ®_cnt, &is_stdcall); |
| 409 | if (ret) |
| 410 | goto out; |
| 411 | |
| 412 | out_toasm_x86(fout, sym, reg_list, reg_cnt, is_stdcall); |
| 413 | } |
| 414 | |
| 415 | fprintf(fout, "# from asm\n\n"); |
| 416 | |
| 417 | while (fgets(line, sizeof(line), fsyms_from)) |
| 418 | { |
| 419 | next_word(sym, sizeof(sym), line); |
| 420 | if (sym[0] == 0 || sym[0] == ';' || sym[0] == '#') |
| 421 | continue; |
| 422 | |
| 423 | ret = find_protostr(protostr, sizeof(protostr), fhdr, |
| 424 | sym, &pline); |
| 425 | if (ret != 0) { |
| 426 | printf("%s: sym '%s' is missing\n", |
| 427 | hdrfn, sym); |
| 428 | goto out; |
| 429 | } |
| 430 | |
| 431 | ret = parse_protostr(protostr, reg_list, ®_cnt, &is_stdcall); |
| 432 | if (ret) |
| 433 | goto out; |
| 434 | |
| 435 | out_fromasm_x86(fout, sym, reg_list, reg_cnt, is_stdcall); |
| 436 | } |
| 437 | |
| 438 | ret = 0; |
| 439 | out: |
| 440 | fclose(fout); |
| 441 | fclose(fsyms_to); |
| 442 | fclose(fsyms_from); |
| 443 | fclose(fhdr); |
| 444 | if (ret) |
| 445 | remove(argv[1]); |
| 446 | |
| 447 | return ret; |
| 448 | } |