X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=tools%2Ftranslate.c;h=2ba40313658b3c18f32996b3ac6906afd9f6cfda;hb=a2c1d768e2fc1ab87bd2ac6e106c7400dd243185;hp=e7f4bdd146cfd5fb0d9a2c3fb66ca7ae2f20026f;hpb=06c5d854748b35f194428e227ae44d7a6a46cd97;p=ia32rtools.git diff --git a/tools/translate.c b/tools/translate.c index e7f4bdd..2ba4031 100644 --- a/tools/translate.c +++ b/tools/translate.c @@ -33,8 +33,12 @@ enum op_flags { OPF_JMP = (1 << 3), /* branches, ret and call */ OPF_CC = (1 << 4), /* uses flags */ OPF_TAIL = (1 << 5), /* ret or tail call */ - OPF_REP = (1 << 6), /* prefixed by rep */ - OPF_RSAVE = (1 << 7), /* push/pop is local reg save/load */ + OPF_RSAVE = (1 << 6), /* push/pop is local reg save/load */ + OPF_REP = (1 << 7), /* prefixed by rep */ + OPF_REPZ = (1 << 8), /* rep is repe/repz */ + OPF_REPNZ = (1 << 9), /* rep is repne/repnz */ + OPF_FARG = (1 << 10), /* push collected as func arg (no reuse) */ + OPF_EBP_S = (1 << 11), /* ebp used as scratch, not BP */ }; enum op_op { @@ -50,6 +54,7 @@ enum op_op { OP_CDQ, OP_STOS, OP_MOVS, + OP_CMPS, OP_RET, OP_ADD, OP_SUB, @@ -101,6 +106,7 @@ enum opr_type { OPT_CONST, }; +// must be sorted (larger len must be further in enum) enum opr_lenmod { OPLM_UNSPEC, OPLM_BYTE, @@ -113,7 +119,11 @@ enum opr_lenmod { struct parsed_opr { enum opr_type type; enum opr_lenmod lmod; - unsigned int is_ptr:1; // pointer in C + unsigned int is_ptr:1; // pointer in C + unsigned int is_array:1; // array in C + unsigned int type_from_var:1; // .. in header, sometimes wrong + unsigned int size_mismatch:1; // type override differs from C + unsigned int size_lt:1; // type override is larger than C int reg; unsigned int val; char name[256]; @@ -127,16 +137,16 @@ struct parsed_op { int regmask_src; // all referensed regs int regmask_dst; int pfomask; // flagop: parsed_flag_op that can't be delayed - int argmask; // push: args that are altered before call + int argnum; // push: altered before call arg # int cc_scratch; // scratch storage during analysis - int bt_i; // branch target (for branches) - struct parsed_op *lrl; // label reference list entry + int bt_i; // branch target for branches + struct parsed_data *btj;// branch targets for jumptables void *datap; }; // datap: // OP_CALL - ptr to parsed_proto -// (OPF_CC) - point to corresponding (OPF_FLAGS) +// (OPF_CC) - point to one of (OPF_FLAGS) that affects cc op struct parsed_equ { char name[64]; @@ -144,6 +154,26 @@ struct parsed_equ { int offset; }; +struct parsed_data { + char label[256]; + enum opr_type type; + enum opr_lenmod lmod; + int count; + int count_alloc; + struct { + union { + char *label; + unsigned int val; + } u; + int bt_i; + } *d; +}; + +struct label_ref { + int i; + struct label_ref *next; +}; + enum ida_func_attr { IDAFA_BP_FRAME = (1 << 0), IDAFA_LIB_FUNC = (1 << 1), @@ -159,19 +189,26 @@ static struct parsed_op ops[MAX_OPS]; static struct parsed_equ *g_eqs; static int g_eqcnt; static char g_labels[MAX_OPS][32]; -static struct parsed_op *g_label_refs[MAX_OPS]; -static struct parsed_proto g_func_pp; +static struct label_ref g_label_refs[MAX_OPS]; +static const struct parsed_proto *g_func_pp; +static struct parsed_data *g_func_pd; +static int g_func_pd_cnt; static char g_func[256]; static char g_comment[256]; static int g_bp_frame; static int g_sp_frame; +static int g_stack_frame_used; static int g_stack_fsz; +static int g_ida_func_attr; #define ferr(op_, fmt, ...) do { \ - printf("error:%s:#%ld: '%s': " fmt, g_func, (op_) - ops, \ + printf("error:%s:#%zd: '%s': " fmt, g_func, (op_) - ops, \ dump_op(op_), ##__VA_ARGS__); \ fcloseall(); \ exit(1); \ } while (0) +#define fnote(op_, fmt, ...) \ + printf("error:%s:#%zd: '%s': " fmt, g_func, (op_) - ops, \ + dump_op(op_), ##__VA_ARGS__) #define MAX_REGS 8 @@ -209,7 +246,8 @@ static int char_array_i(const char *array[], size_t len, const char *s) return -1; } -static void printf_number(char *buf, size_t buf_size, long number) +static void printf_number(char *buf, size_t buf_size, + unsigned long number) { // output in C-friendly form snprintf(buf, buf_size, number < 10 ? "%lu" : "0x%02lx", number); @@ -243,14 +281,14 @@ static int parse_reg(enum opr_lenmod *reg_lmod, const char *s) return -1; } -static long parse_number(const char *number) +static unsigned long parse_number(const char *number) { int len = strlen(number); const char *p = number; char *endp = NULL; + unsigned long ret; int neg = 0; int bad; - long ret; if (*p == '-') { neg = 1; @@ -259,11 +297,11 @@ static long parse_number(const char *number) if (len > 1 && *p == '0') p++; if (number[len - 1] == 'h') { - ret = strtol(p, &endp, 16); + ret = strtoul(p, &endp, 16); bad = (*endp != 'h'); } else { - ret = strtol(p, &endp, 10); + ret = strtoul(p, &endp, 10); bad = (*endp != 0); } if (bad) @@ -329,19 +367,55 @@ pass: return c; } -static const char *parse_stack_el(const char *name) +static int is_reg_in_str(const char *s) +{ + int i; + + if (strlen(s) < 3 || (s[3] && !my_issep(s[3]) && !my_isblank(s[3]))) + return 0; + + for (i = 0; i < ARRAY_SIZE(regs_r32); i++) + if (!strncmp(s, regs_r32[i], 3)) + return 1; + + return 0; +} + +static const char *parse_stack_el(const char *name, char *extra_reg) { - const char *p, *s; + const char *p, *p2, *s; char *endp = NULL; char buf[32]; long val; int len; - if (IS_START(name, "ebp+") - && !('0' <= name[4] && name[4] <= '9')) - { - return name + 4; + p = name; + if (IS_START(p + 3, "+ebp+") && is_reg_in_str(p)) { + p += 4; + if (extra_reg != NULL) { + strncpy(extra_reg, name, 3); + extra_reg[4] = 0; + } + } + + if (IS_START(p, "ebp+")) { + p += 4; + + p2 = strchr(p, '+'); + if (p2 != NULL && is_reg_in_str(p)) { + if (extra_reg != NULL) { + strncpy(extra_reg, p, p2 - p); + extra_reg[p2 - p] = 0; + } + p = p2 + 1; + } + + if (!('0' <= *p && *p <= '9')) + return p; + + return NULL; } + if (!IS_START(name, "esp+")) return NULL; @@ -393,61 +467,70 @@ static int guess_lmod_from_name(struct parsed_opr *opr) return 0; } -static int guess_lmod_from_c_type(struct parsed_opr *opr, const char *c_type) +static int guess_lmod_from_c_type(enum opr_lenmod *lmod, + const struct parsed_type *c_type) { - static const char *ptr_types[] = { - "LPCSTR", - }; static const char *dword_types[] = { - "int", "_DWORD", "DWORD", "HANDLE", "HWND", "HMODULE", + "int", "_DWORD", "UINT_PTR", + "DWORD", "HANDLE", "HWND", "HMODULE", + "WPARAM", "LPARAM", "UINT", }; static const char *word_types[] = { - "__int16", "unsigned __int16", + "uint16_t", "int16_t", + "unsigned __int16", "__int16", }; static const char *byte_types[] = { - "char", "__int8", "unsigned __int8", "BYTE", + "uint8_t", "int8_t", "char", + "unsigned __int8", "__int8", "BYTE", + "_UNKNOWN", }; + const char *n; int i; - if (strchr(c_type, '*')) { - opr->lmod = OPLM_DWORD; - opr->is_ptr = 1; + if (c_type->is_ptr) { + *lmod = OPLM_DWORD; return 1; } - for (i = 0; i < ARRAY_SIZE(dword_types); i++) { - if (IS(c_type, dword_types[i])) { - opr->lmod = OPLM_DWORD; - return 1; - } - } + n = skip_type_mod(c_type->name); - for (i = 0; i < ARRAY_SIZE(ptr_types); i++) { - if (IS(c_type, ptr_types[i])) { - opr->lmod = OPLM_DWORD; - opr->is_ptr = 1; + for (i = 0; i < ARRAY_SIZE(dword_types); i++) { + if (IS(n, dword_types[i])) { + *lmod = OPLM_DWORD; return 1; } } for (i = 0; i < ARRAY_SIZE(word_types); i++) { - if (IS(c_type, word_types[i])) { - opr->lmod = OPLM_WORD; + if (IS(n, word_types[i])) { + *lmod = OPLM_WORD; return 1; } } for (i = 0; i < ARRAY_SIZE(byte_types); i++) { - if (IS(c_type, byte_types[i])) { - opr->lmod = OPLM_BYTE; + if (IS(n, byte_types[i])) { + *lmod = OPLM_BYTE; return 1; } } - anote("unhandled C type '%s' for '%s'\n", c_type, opr->name); return 0; } +static enum opr_type lmod_from_directive(const char *d) +{ + if (IS(d, "dd")) + return OPLM_DWORD; + else if (IS(d, "dw")) + return OPLM_WORD; + else if (IS(d, "db")) + return OPLM_BYTE; + + aerr("unhandled directive: '%s'\n", d); + return OPLM_UNSPEC; +} + static void setup_reg_opr(struct parsed_opr *opr, int reg, enum opr_lenmod lmod, int *regmask) { @@ -464,10 +547,10 @@ static int parse_operand(struct parsed_opr *opr, int *regmask, int *regmask_indirect, char words[16][256], int wordc, int w, unsigned int op_flags) { - struct parsed_proto pp; + const struct parsed_proto *pp; enum opr_lenmod tmplmod; + unsigned long number; int ret, len; - long number; int wordc_in; char *tmp; int i; @@ -559,10 +642,10 @@ static int parse_operand(struct parsed_opr *opr, aerr("[] parse failure\n"); parse_indmode(opr->name, regmask_indirect, 1); - if (opr->lmod == OPLM_UNSPEC && parse_stack_el(opr->name)) { + if (opr->lmod == OPLM_UNSPEC && parse_stack_el(opr->name, NULL)) { // might be an equ struct parsed_equ *eq = - equ_find(NULL, parse_stack_el(opr->name), &i); + equ_find(NULL, parse_stack_el(opr->name, NULL), &i); if (eq) opr->lmod = eq->lmod; } @@ -595,14 +678,30 @@ static int parse_operand(struct parsed_opr *opr, // most likely var in data segment opr->type = OPT_LABEL; - ret = proto_parse(g_fhdr, opr->name, &pp); - if (ret == 0) { - if (pp.is_fptr) { + pp = proto_parse(g_fhdr, opr->name); + if (pp != NULL) { + if (pp->is_fptr) { opr->lmod = OPLM_DWORD; opr->is_ptr = 1; } - else if (opr->lmod == OPLM_UNSPEC) - guess_lmod_from_c_type(opr, pp.ret_type); + else { + tmplmod = OPLM_UNSPEC; + if (!guess_lmod_from_c_type(&tmplmod, &pp->type)) + anote("unhandled C type '%s' for '%s'\n", + pp->type.name, opr->name); + + if (opr->lmod == OPLM_UNSPEC) { + opr->lmod = tmplmod; + opr->type_from_var = 1; + } + else if (opr->lmod != tmplmod) { + opr->size_mismatch = 1; + if (tmplmod < opr->lmod) + opr->size_lt = 1; + } + opr->is_ptr = pp->type.is_ptr; + } + opr->is_array = pp->type.is_array; } if (opr->lmod == OPLM_UNSPEC) @@ -615,6 +714,10 @@ static const struct { unsigned int flags; } pref_table[] = { { "rep", OPF_REP }, + { "repe", OPF_REP|OPF_REPZ }, + { "repz", OPF_REP|OPF_REPZ }, + { "repne", OPF_REP|OPF_REPNZ }, + { "repnz", OPF_REP|OPF_REPNZ }, }; static const struct { @@ -639,6 +742,9 @@ static const struct { { "movsb",OP_MOVS, 0, 0, OPF_DATA }, { "movsw",OP_MOVS, 0, 0, OPF_DATA }, { "movsd",OP_MOVS, 0, 0, OPF_DATA }, + { "cmpsb",OP_CMPS, 0, 0, OPF_DATA|OPF_FLAGS }, + { "cmpsw",OP_CMPS, 0, 0, OPF_DATA|OPF_FLAGS }, + { "cmpsd",OP_CMPS, 0, 0, OPF_DATA|OPF_FLAGS }, { "add", OP_ADD, 2, 2, OPF_DATA|OPF_FLAGS }, { "sub", OP_SUB, 2, 2, OPF_DATA|OPF_FLAGS }, { "and", OP_AND, 2, 2, OPF_DATA|OPF_FLAGS }, @@ -661,8 +767,8 @@ static const struct { { "idiv", OP_IDIV, 1, 1, OPF_DATA|OPF_FLAGS }, { "test", OP_TEST, 2, 2, OPF_FLAGS }, { "cmp", OP_CMP, 2, 2, OPF_FLAGS }, - { "retn", OP_RET, 0, 1, OPF_JMP|OPF_TAIL }, - { "call", OP_CALL, 1, 1, OPF_JMP|OPF_FLAGS }, + { "retn", OP_RET, 0, 1, OPF_TAIL }, + { "call", OP_CALL, 1, 1, OPF_JMP|OPF_DATA|OPF_FLAGS }, { "jmp", OP_JMP, 1, 1, OPF_JMP }, { "jo", OP_JO, 1, 1, OPF_JMP|OPF_CC }, // 70 OF=1 { "jno", OP_JNO, 1, 1, OPF_JMP|OPF_CC }, // 71 OF=0 @@ -812,13 +918,14 @@ static void parse_op(struct parsed_op *op, char words[16][256], int wordc) break; case OP_MOVS: + case OP_CMPS: if (op->operand_cnt != 0) break; - if (IS(words[op_w], "movsb")) + if (words[op_w][4] == 'b') lmod = OPLM_BYTE; - else if (IS(words[op_w], "movsw")) + else if (words[op_w][4] == 'w') lmod = OPLM_WORD; - else if (IS(words[op_w], "movsd")) + else if (words[op_w][4] == 'd') lmod = OPLM_DWORD; op->operand_cnt = 3; setup_reg_opr(&op->operand[0], xDI, lmod, &op->regmask_src); @@ -859,6 +966,34 @@ static void parse_op(struct parsed_op *op, char words[16][256], int wordc) op->operand[1].lmod = OPLM_BYTE; break; + case OP_PUSH: + if (op->operand[0].lmod == OPLM_UNSPEC + && (op->operand[0].type == OPT_CONST + || op->operand[0].type == OPT_OFFSET + || op->operand[0].type == OPT_LABEL)) + op->operand[0].lmod = OPLM_DWORD; + break; + + // alignment + case OP_MOV: + if (op->operand[0].type == OPT_REG && op->operand[1].type == OPT_REG + && op->operand[0].reg == xDI && op->operand[1].reg == xDI) + { + op->flags |= OPF_RMD; + } + break; + + case OP_LEA: + if (op->operand[0].type == OPT_REG + && op->operand[1].type == OPT_REGMEM) + { + char buf[16]; + snprintf(buf, sizeof(buf), "%s+0", op->operand[0].name); + if (IS(buf, op->operand[1].name)) + op->flags |= OPF_RMD; + } + break; + default: break; } @@ -882,6 +1017,9 @@ static const char *dump_op(struct parsed_op *po) char *p = out; int i; + if (po == NULL) + return "???"; + snprintf(out, sizeof(out), "%s", op_name(po->op)); for (i = 0; i < po->operand_cnt; i++) { p += strlen(p); @@ -895,6 +1033,22 @@ static const char *dump_op(struct parsed_op *po) return out; } +static const char *lmod_type_u(struct parsed_op *po, + enum opr_lenmod lmod) +{ + switch (lmod) { + case OPLM_DWORD: + return "u32"; + case OPLM_WORD: + return "u16"; + case OPLM_BYTE: + return "u8"; + default: + ferr(po, "invalid lmod: %d\n", lmod); + return "(_invalid_)"; + } +} + static const char *lmod_cast_u(struct parsed_op *po, enum opr_lenmod lmod) { @@ -989,6 +1143,46 @@ static const char *opr_reg_p(struct parsed_op *po, struct parsed_opr *popr) return regs_r32[popr->reg]; } +// cast1 is the "final" cast +static const char *simplify_cast(const char *cast1, const char *cast2) +{ + static char buf[256]; + + if (cast1[0] == 0) + return cast2; + if (cast2[0] == 0) + return cast1; + if (IS(cast1, cast2)) + return cast1; + if (IS(cast1, "(s8)") && IS(cast2, "(u8)")) + return cast1; + if (IS(cast1, "(s16)") && IS(cast2, "(u16)")) + return cast1; + if (IS(cast1, "(u8)") && IS_START(cast2, "*(u8 *)")) + return cast2; + if (IS(cast1, "(u16)") && IS_START(cast2, "*(u16 *)")) + return cast2; + + snprintf(buf, sizeof(buf), "%s%s", cast1, cast2); + return buf; +} + +static const char *simplify_cast_num(const char *cast, unsigned int val) +{ + if (IS(cast, "(u8)") && val < 0x100) + return ""; + if (IS(cast, "(s8)") && val < 0x80) + return ""; + if (IS(cast, "(u16)") && val < 0x10000) + return ""; + if (IS(cast, "(s16)") && val < 0x8000) + return ""; + if (IS(cast, "(s32)") && val < 0x80000000) + return ""; + + return cast; +} + static struct parsed_equ *equ_find(struct parsed_op *po, const char *name, int *extra_offs) { @@ -1027,86 +1221,241 @@ static struct parsed_equ *equ_find(struct parsed_op *po, const char *name, } static void stack_frame_access(struct parsed_op *po, - enum opr_lenmod lmod, char *buf, size_t buf_size, - const char *name, int is_src, int is_lea) + struct parsed_opr *popr, char *buf, size_t buf_size, + const char *name, const char *cast, int is_src, int is_lea) { + enum opr_lenmod tmp_lmod = OPLM_UNSPEC; const char *prefix = ""; + const char *bp_arg = NULL; + char ofs_reg[16] = { 0, }; struct parsed_equ *eq; + const char *p; + char *endp = NULL; int i, arg_i, arg_s; - const char *bp_arg; + int unaligned = 0; int stack_ra = 0; int offset = 0; int sf_ofs; + int lim; - bp_arg = parse_stack_el(name); - snprintf(g_comment, sizeof(g_comment), "%s", bp_arg); - eq = equ_find(po, bp_arg, &offset); - if (eq == NULL) - ferr(po, "detected but missing eq\n"); + if (po->flags & OPF_EBP_S) + ferr(po, "stack_frame_access while ebp is scratch\n"); - offset += eq->offset; + if (IS_START(name, "ebp-") + || (IS_START(name, "ebp+") && '0' <= name[4] && name[4] <= '9')) + { + p = name + 4; + if (IS_START(p, "0x")) + p += 2; + offset = strtoul(p, &endp, 16); + if (name[3] == '-') + offset = -offset; + if (*endp != 0) + ferr(po, "ebp- parse of '%s' failed\n", name); + } + else { + bp_arg = parse_stack_el(name, ofs_reg); + snprintf(g_comment, sizeof(g_comment), "%s", bp_arg); + eq = equ_find(po, bp_arg, &offset); + if (eq == NULL) + ferr(po, "detected but missing eq\n"); + offset += eq->offset; + } if (!strncmp(name, "ebp", 3)) stack_ra = 4; - if (stack_ra <= offset && offset < stack_ra + 4) + if (ofs_reg[0] == 0 && stack_ra <= offset && offset < stack_ra + 4) ferr(po, "reference to ra? %d %d\n", offset, stack_ra); - if (offset > stack_ra) { + if (offset > stack_ra) + { arg_i = (offset - stack_ra - 4) / 4; - if (arg_i < 0 || arg_i >= g_func_pp.argc_stack) - ferr(po, "offset %d (%s) doesn't map to any arg\n", - offset, bp_arg); + if (arg_i < 0 || arg_i >= g_func_pp->argc_stack) + { + if (g_func_pp->is_vararg + && arg_i == g_func_pp->argc_stack && is_lea) + { + // should be va_list + if (cast[0] == 0) + cast = "(u32)"; + snprintf(buf, buf_size, "%sap", cast); + return; + } + ferr(po, "offset %d (%s,%d) doesn't map to any arg\n", + offset, bp_arg, arg_i); + } + if (ofs_reg[0] != 0) + ferr(po, "offset reg on arg access?\n"); - for (i = arg_s = 0; i < g_func_pp.argc; i++) { - if (g_func_pp.arg[i].reg != NULL) + for (i = arg_s = 0; i < g_func_pp->argc; i++) { + if (g_func_pp->arg[i].reg != NULL) continue; if (arg_s == arg_i) break; arg_s++; } - if (i == g_func_pp.argc) + if (i == g_func_pp->argc) ferr(po, "arg %d not in prototype?\n", arg_i); - if (is_lea) - ferr(po, "lea to arg?\n"); - snprintf(buf, buf_size, "%sa%d", is_src ? "(u32)" : "", i + 1); + popr->is_ptr = g_func_pp->arg[i].type.is_ptr; + + switch (popr->lmod) + { + case OPLM_BYTE: + if (is_lea) + ferr(po, "lea/byte to arg?\n"); + if (is_src && (offset & 3) == 0) + snprintf(buf, buf_size, "%sa%d", + simplify_cast(cast, "(u8)"), i + 1); + else + snprintf(buf, buf_size, "%sBYTE%d(a%d)", + cast, offset & 3, i + 1); + break; + + case OPLM_WORD: + if (is_lea) + ferr(po, "lea/word to arg?\n"); + if (offset & 1) { + unaligned = 1; + if (!is_src) { + if (offset & 2) + ferr(po, "problematic arg store\n"); + snprintf(buf, buf_size, "%s((char *)&a%d + 1)", + simplify_cast(cast, "*(u16 *)"), i + 1); + } + else + ferr(po, "unaligned arg word load\n"); + } + else if (is_src && (offset & 2) == 0) + snprintf(buf, buf_size, "%sa%d", + simplify_cast(cast, "(u16)"), i + 1); + else + snprintf(buf, buf_size, "%s%sWORD(a%d)", + cast, (offset & 2) ? "HI" : "LO", i + 1); + break; + + case OPLM_DWORD: + if (cast[0]) + prefix = cast; + else if (is_src) + prefix = "(u32)"; + + if (offset & 3) { + unaligned = 1; + if (is_lea) + snprintf(buf, buf_size, "(u32)&a%d + %d", + i + 1, offset & 3); + else if (!is_src) + ferr(po, "unaligned arg store\n"); + else { + // mov edx, [ebp+arg_4+2]; movsx ecx, dx + snprintf(buf, buf_size, "%s(a%d >> %d)", + prefix, i + 1, (offset & 3) * 8); + } + } + else { + snprintf(buf, buf_size, "%s%sa%d", + prefix, is_lea ? "&" : "", i + 1); + } + break; + + default: + ferr(po, "bp_arg bad lmod: %d\n", popr->lmod); + } + + if (unaligned) + snprintf(g_comment, sizeof(g_comment), "%s unaligned", bp_arg); + + // common problem + guess_lmod_from_c_type(&tmp_lmod, &g_func_pp->arg[i].type); + if (tmp_lmod != OPLM_DWORD + && (unaligned || (!is_src && tmp_lmod < popr->lmod))) + { + ferr(po, "bp_arg arg%d/w offset %d and type '%s' is too small\n", + i + 1, offset, g_func_pp->arg[i].type.name); + } } - else { + else + { if (g_stack_fsz == 0) ferr(po, "stack var access without stackframe\n"); + g_stack_frame_used = 1; sf_ofs = g_stack_fsz + offset; - if (sf_ofs < 0) + lim = (ofs_reg[0] != 0) ? -4 : 0; + if (offset > 0 || sf_ofs < lim) ferr(po, "bp_stack offset %d/%d\n", offset, g_stack_fsz); if (is_lea) prefix = "(u32)&"; + else + prefix = cast; - switch (lmod) + switch (popr->lmod) { case OPLM_BYTE: - snprintf(buf, buf_size, "%ssf.b[%d]", prefix, sf_ofs); + snprintf(buf, buf_size, "%ssf.b[%d%s%s]", + prefix, sf_ofs, ofs_reg[0] ? "+" : "", ofs_reg); break; + case OPLM_WORD: + if ((sf_ofs & 1) || ofs_reg[0] != 0) { + // known unaligned or possibly unaligned + strcat(g_comment, " unaligned"); + if (prefix[0] == 0) + prefix = "*(u16 *)&"; + snprintf(buf, buf_size, "%ssf.b[%d%s%s]", + prefix, sf_ofs, ofs_reg[0] ? "+" : "", ofs_reg); + break; + } snprintf(buf, buf_size, "%ssf.w[%d]", prefix, sf_ofs / 2); break; + case OPLM_DWORD: + if ((sf_ofs & 3) || ofs_reg[0] != 0) { + // known unaligned or possibly unaligned + strcat(g_comment, " unaligned"); + if (prefix[0] == 0) + prefix = "*(u32 *)&"; + snprintf(buf, buf_size, "%ssf.b[%d%s%s]", + prefix, sf_ofs, ofs_reg[0] ? "+" : "", ofs_reg); + break; + } snprintf(buf, buf_size, "%ssf.d[%d]", prefix, sf_ofs / 4); break; + default: - ferr(po, "bp_stack bad lmod: %d\n", lmod); + ferr(po, "bp_stack bad lmod: %d\n", popr->lmod); } } } +static void check_label_read_ref(struct parsed_op *po, const char *name) +{ + const struct parsed_proto *pp; + + pp = proto_parse(g_fhdr, name); + if (pp == NULL) + ferr(po, "proto_parse failed for ref '%s'\n", name); + + // currently we can take __cdecl and __stdcall + if (pp->is_func && pp->argc_reg != 0) + ferr(po, "reg-arg func reference?\n"); +} + static char *out_src_opr(char *buf, size_t buf_size, - struct parsed_op *po, struct parsed_opr *popr, int is_lea) + struct parsed_op *po, struct parsed_opr *popr, const char *cast, + int is_lea) { char tmp1[256], tmp2[256]; char expr[256]; + char *p; int ret; + if (cast == NULL) + cast = ""; + switch (popr->type) { case OPT_REG: if (is_lea) @@ -1114,16 +1463,19 @@ static char *out_src_opr(char *buf, size_t buf_size, switch (popr->lmod) { case OPLM_DWORD: - snprintf(buf, buf_size, "%s", opr_reg_p(po, popr)); + snprintf(buf, buf_size, "%s%s", cast, opr_reg_p(po, popr)); break; case OPLM_WORD: - snprintf(buf, buf_size, "(u16)%s", opr_reg_p(po, popr)); + snprintf(buf, buf_size, "%s%s", + simplify_cast(cast, "(u16)"), opr_reg_p(po, popr)); break; case OPLM_BYTE: if (popr->name[1] == 'h') // XXX.. - snprintf(buf, buf_size, "(u8)(%s >> 8)", opr_reg_p(po, popr)); + snprintf(buf, buf_size, "%s(%s >> 8)", + simplify_cast(cast, "(u8)"), opr_reg_p(po, popr)); else - snprintf(buf, buf_size, "(u8)%s", opr_reg_p(po, popr)); + snprintf(buf, buf_size, "%s%s", + simplify_cast(cast, "(u8)"), opr_reg_p(po, popr)); break; default: ferr(po, "invalid src lmod: %d\n", popr->lmod); @@ -1131,9 +1483,12 @@ static char *out_src_opr(char *buf, size_t buf_size, break; case OPT_REGMEM: - if (parse_stack_el(popr->name)) { - stack_frame_access(po, popr->lmod, buf, buf_size, - popr->name, 1, is_lea); + if (parse_stack_el(popr->name, NULL) + || (g_bp_frame && !(po->flags & OPF_EBP_S) + && IS_START(popr->name, "ebp"))) + { + stack_frame_access(po, popr, buf, buf_size, + popr->name, cast, 1, is_lea); break; } @@ -1143,6 +1498,14 @@ static char *out_src_opr(char *buf, size_t buf_size, ret = sscanf(expr, "%[^[][%[^]]]", tmp1, tmp2); if (ret != 2) ferr(po, "parse failure for '%s'\n", expr); + if (tmp1[0] == '(') { + // (off_4FFF50+3)[eax] + p = strchr(tmp1 + 1, ')'); + if (p == NULL || p[1] != 0) + ferr(po, "parse failure (2) for '%s'\n", expr); + *p = 0; + memmove(tmp1, tmp1 + 1, strlen(tmp1)); + } snprintf(expr, sizeof(expr), "(u32)&%s + %s", tmp1, tmp2); } @@ -1153,27 +1516,42 @@ static char *out_src_opr(char *buf, size_t buf_size, } snprintf(buf, buf_size, "%s(%s)", - lmod_cast_u_ptr(po, popr->lmod), expr); + simplify_cast(cast, lmod_cast_u_ptr(po, popr->lmod)), expr); break; case OPT_LABEL: + check_label_read_ref(po, popr->name); + if (cast[0] == 0 && popr->is_ptr) + cast = "(u32)"; + if (is_lea) snprintf(buf, buf_size, "(u32)&%s", popr->name); + else if (popr->size_lt) + snprintf(buf, buf_size, "%s%s%s%s", cast, + lmod_cast_u_ptr(po, popr->lmod), + popr->is_array ? "" : "&", + popr->name); else - snprintf(buf, buf_size, "(u32)%s", popr->name); + snprintf(buf, buf_size, "%s%s%s", cast, popr->name, + popr->is_array ? "[0]" : ""); break; case OPT_OFFSET: + check_label_read_ref(po, popr->name); + if (cast[0] == 0) + cast = "(u32)"; if (is_lea) ferr(po, "lea an offset?\n"); - snprintf(buf, buf_size, "(u32)&%s", popr->name); + snprintf(buf, buf_size, "%s&%s", cast, popr->name); break; case OPT_CONST: if (is_lea) ferr(po, "lea from const?\n"); - printf_number(buf, buf_size, popr->val); + printf_number(tmp1, sizeof(tmp1), popr->val); + snprintf(buf, buf_size, "%s%s", + simplify_cast_num(cast, popr->val), tmp1); break; default: @@ -1183,6 +1561,7 @@ static char *out_src_opr(char *buf, size_t buf_size, return buf; } +// note: may set is_ptr (we find that out late for ebp frame..) static char *out_dst_opr(char *buf, size_t buf_size, struct parsed_op *po, struct parsed_opr *popr) { @@ -1209,16 +1588,25 @@ static char *out_dst_opr(char *buf, size_t buf_size, break; case OPT_REGMEM: - if (parse_stack_el(popr->name)) { - stack_frame_access(po, popr->lmod, buf, buf_size, - popr->name, 0, 0); + if (parse_stack_el(popr->name, NULL) + || (g_bp_frame && !(po->flags & OPF_EBP_S) + && IS_START(popr->name, "ebp"))) + { + stack_frame_access(po, popr, buf, buf_size, + popr->name, "", 0, 0); break; } - return out_src_opr(buf, buf_size, po, popr, 0); + return out_src_opr(buf, buf_size, po, popr, NULL, 0); case OPT_LABEL: - snprintf(buf, buf_size, "%s", popr->name); + if (popr->size_mismatch) + snprintf(buf, buf_size, "%s%s%s", + lmod_cast_u_ptr(po, popr->lmod), + popr->is_array ? "" : "&", popr->name); + else + snprintf(buf, buf_size, "%s%s", popr->name, + popr->is_array ? "[0]" : ""); break; default: @@ -1228,6 +1616,12 @@ static char *out_dst_opr(char *buf, size_t buf_size, return buf; } +static char *out_src_opr_u32(char *buf, size_t buf_size, + struct parsed_op *po, struct parsed_opr *popr) +{ + return out_src_opr(buf, buf_size, po, popr, NULL, 0); +} + static enum parsed_flag_op split_cond(struct parsed_op *po, enum op_op op, int *is_inv) { @@ -1319,50 +1713,85 @@ static void out_test_for_cc(char *buf, size_t buf_size, } static void out_cmp_for_cc(char *buf, size_t buf_size, - struct parsed_op *po, enum parsed_flag_op pfo, int is_inv, - enum opr_lenmod lmod, const char *expr1, const char *expr2) + struct parsed_op *po, enum parsed_flag_op pfo, int is_inv) { - const char *cast, *scast; + const char *cast, *scast, *cast_use; + char buf1[256], buf2[256]; + enum opr_lenmod lmod; + + if (po->operand[0].lmod != po->operand[1].lmod) + ferr(po, "%s: lmod mismatch: %d %d\n", __func__, + po->operand[0].lmod, po->operand[1].lmod); + lmod = po->operand[0].lmod; cast = lmod_cast_u(po, lmod); scast = lmod_cast_s(po, lmod); + switch (pfo) { + case PFO_C: + case PFO_Z: + case PFO_BE: // !a + cast_use = cast; + break; + + case PFO_S: + case PFO_L: // !ge + case PFO_LE: + cast_use = scast; + break; + + default: + ferr(po, "%s: unhandled parsed_flag_op: %d\n", __func__, pfo); + } + + out_src_opr(buf1, sizeof(buf1), po, &po->operand[0], cast_use, 0); + out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], cast_use, 0); + switch (pfo) { case PFO_C: // note: must be unsigned compare - snprintf(buf, buf_size, "(%s%s %s %s%s)", - cast, expr1, is_inv ? ">=" : "<", cast, expr2); + snprintf(buf, buf_size, "(%s %s %s)", + buf1, is_inv ? ">=" : "<", buf2); break; case PFO_Z: - snprintf(buf, buf_size, "(%s%s %s %s%s)", - cast, expr1, is_inv ? "!=" : "==", cast, expr2); + snprintf(buf, buf_size, "(%s %s %s)", + buf1, is_inv ? "!=" : "==", buf2); break; case PFO_BE: // !a // note: must be unsigned compare - snprintf(buf, buf_size, "(%s%s %s %s%s)", - cast, expr1, is_inv ? ">" : "<=", cast, expr2); + snprintf(buf, buf_size, "(%s %s %s)", + buf1, is_inv ? ">" : "<=", buf2); + + // annoying case + if (is_inv && lmod == OPLM_BYTE + && po->operand[1].type == OPT_CONST + && po->operand[1].val == 0xff) + { + snprintf(g_comment, sizeof(g_comment), "if %s", buf); + snprintf(buf, buf_size, "(0)"); + } break; // note: must be signed compare case PFO_S: snprintf(buf, buf_size, "(%s(%s - %s) %s 0)", - scast, expr1, expr2, is_inv ? ">=" : "<"); + scast, buf1, buf2, is_inv ? ">=" : "<"); break; case PFO_L: // !ge - snprintf(buf, buf_size, "(%s%s %s %s%s)", - scast, expr1, is_inv ? ">=" : "<", scast, expr2); + snprintf(buf, buf_size, "(%s %s %s)", + buf1, is_inv ? ">=" : "<", buf2); break; case PFO_LE: - snprintf(buf, buf_size, "(%s%s %s %s%s)", - scast, expr1, is_inv ? ">" : "<=", scast, expr2); + snprintf(buf, buf_size, "(%s %s %s)", + buf1, is_inv ? ">" : "<=", buf2); break; default: - ferr(po, "%s: unhandled parsed_flag_op: %d\n", __func__, pfo); + break; } } @@ -1373,21 +1802,18 @@ static void out_cmp_test(char *buf, size_t buf_size, if (po->op == OP_TEST) { if (IS(opr_name(po, 0), opr_name(po, 1))) { - out_src_opr(buf3, sizeof(buf3), po, &po->operand[0], 0); + out_src_opr_u32(buf3, sizeof(buf3), po, &po->operand[0]); } else { - out_src_opr(buf1, sizeof(buf1), po, &po->operand[0], 0); - out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0); + out_src_opr_u32(buf1, sizeof(buf1), po, &po->operand[0]); + out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1]); snprintf(buf3, sizeof(buf3), "(%s & %s)", buf1, buf2); } out_test_for_cc(buf, buf_size, po, pfo, is_inv, po->operand[0].lmod, buf3); } else if (po->op == OP_CMP) { - out_src_opr(buf2, sizeof(buf2), po, &po->operand[0], 0); - out_src_opr(buf3, sizeof(buf3), po, &po->operand[1], 0); - out_cmp_for_cc(buf, buf_size, po, pfo, is_inv, - po->operand[0].lmod, buf2, buf3); + out_cmp_for_cc(buf, buf_size, po, pfo, is_inv); } else ferr(po, "%s: unhandled op: %d\n", __func__, po->op); @@ -1403,8 +1829,23 @@ static void propagate_lmod(struct parsed_op *po, struct parsed_opr *popr1, popr1->lmod = popr2->lmod; else if (popr2->lmod == OPLM_UNSPEC) popr2->lmod = popr1->lmod; - else if (popr1->lmod != popr2->lmod) - ferr(po, "conflicting lmods: %d vs %d\n", popr1->lmod, popr2->lmod); + else if (popr1->lmod != popr2->lmod) { + if (popr1->type_from_var) { + popr1->size_mismatch = 1; + if (popr1->lmod < popr2->lmod) + popr1->size_lt = 1; + popr1->lmod = popr2->lmod; + } + else if (popr2->type_from_var) { + popr2->size_mismatch = 1; + if (popr2->lmod < popr1->lmod) + popr2->size_lt = 1; + popr2->lmod = popr1->lmod; + } + else + ferr(po, "conflicting lmods: %d vs %d\n", + popr1->lmod, popr2->lmod); + } } static const char *op_to_c(struct parsed_op *po) @@ -1435,22 +1876,23 @@ static const char *op_to_c(struct parsed_op *po) } } -static void set_flag_no_dup(struct parsed_op *po, enum op_flags flag, - enum op_flags flag_check) +static void op_set_clear_flag(struct parsed_op *po, + enum op_flags flag_set, enum op_flags flag_clear) { - if (po->flags & flag) - ferr(po, "flag %x already set\n", flag); - if (po->flags & flag_check) - ferr(po, "flag_check %x already set\n", flag_check); - - po->flags |= flag; + po->flags |= flag_set; + po->flags &= ~flag_clear; } +// last op in stream - unconditional branch or ret +#define LAST_OP(_i) ((ops[_i].flags & OPF_TAIL) \ + || (ops[_i].flags & (OPF_JMP|OPF_CC)) == OPF_JMP) + static int scan_for_pop(int i, int opcnt, const char *reg, int magic, int depth, int *maxdepth, int do_flags) { struct parsed_op *po; int ret = 0; + int j; for (; i < opcnt; i++) { po = &ops[i]; @@ -1462,10 +1904,23 @@ static int scan_for_pop(int i, int opcnt, const char *reg, return -1; // deadend if ((po->flags & OPF_RMD) - || (po->op == OP_PUSH && po->argmask)) // arg push + || (po->op == OP_PUSH && po->argnum != 0)) // arg push continue; if ((po->flags & OPF_JMP) && po->op != OP_CALL) { + if (po->btj != NULL) { + // jumptable + for (j = 0; j < po->btj->count - 1; j++) { + ret |= scan_for_pop(po->btj->d[j].bt_i, opcnt, reg, magic, + depth, maxdepth, do_flags); + if (ret < 0) + return ret; // dead end + } + // follow last jumptable entry + i = po->btj->d[j].bt_i - 1; + continue; + } + if (po->bt_i < 0) { ferr(po, "dead branch\n"); return -1; @@ -1492,11 +1947,11 @@ static int scan_for_pop(int i, int opcnt, const char *reg, if (depth > *maxdepth) *maxdepth = depth; if (do_flags) - set_flag_no_dup(po, OPF_RSAVE, OPF_RMD); + op_set_clear_flag(po, OPF_RSAVE, OPF_RMD); } else if (depth == 0) { if (do_flags) - set_flag_no_dup(po, OPF_RMD, OPF_RSAVE); + op_set_clear_flag(po, OPF_RMD, OPF_RSAVE); return 1; } else { @@ -1504,7 +1959,7 @@ static int scan_for_pop(int i, int opcnt, const char *reg, if (depth < 0) // should not happen ferr(po, "fail with depth\n"); if (do_flags) - set_flag_no_dup(po, OPF_RSAVE, OPF_RMD); + op_set_clear_flag(po, OPF_RSAVE, OPF_RMD); } } } @@ -1571,7 +2026,17 @@ static int is_any_opr_modified(const struct parsed_op *po_test, if ((po->flags & OPF_RMD) || !(po->flags & OPF_DATA)) return 0; - if (po_test->regmask_src & po->regmask_dst) + if (po_test->operand_cnt == 1 && po_test->operand[0].type == OPT_CONST) + return 0; + + if ((po_test->regmask_src | po_test->regmask_dst) & po->regmask_dst) + return 1; + + // in reality, it can wreck any register, but in decompiled C + // version it can only overwrite eax or edx:eax + if (po->op == OP_CALL + && ((po_test->regmask_src | po_test->regmask_dst) + & ((1 << xAX)|(1 << xDX)))) return 1; for (i = 0; i < po_test->operand_cnt; i++) @@ -1584,6 +2049,9 @@ static int is_any_opr_modified(const struct parsed_op *po_test, // scan for any po_test operand modification in range given static int scan_for_mod(struct parsed_op *po_test, int i, int opcnt) { + if (po_test->operand_cnt == 1 && po_test->operand[0].type == OPT_CONST) + return -1; + for (; i < opcnt; i++) { if (is_any_opr_modified(po_test, &ops[i])) return i; @@ -1604,15 +2072,48 @@ static int scan_for_mod_opr0(struct parsed_op *po_test, return -1; } -static int scan_for_flag_set(int i) +static int scan_for_flag_set(int i, int magic, int *branched, + int *setters, int *setter_cnt) { - for (; i >= 0; i--) { - if (ops[i].flags & OPF_FLAGS) - return i; + struct label_ref *lr; + int ret; - if ((ops[i].flags & OPF_JMP) && !(ops[i].flags & OPF_CC)) + while (i >= 0) { + if (ops[i].cc_scratch == magic) { + ferr(&ops[i], "%s looped\n", __func__); return -1; - if (g_labels[i][0] != 0) + } + ops[i].cc_scratch = magic; + + if (g_labels[i][0] != 0) { + *branched = 1; + + lr = &g_label_refs[i]; + for (; lr->next; lr = lr->next) { + ret = scan_for_flag_set(lr->i, magic, + branched, setters, setter_cnt); + if (ret < 0) + return ret; + } + + if (i > 0 && LAST_OP(i - 1)) { + i = lr->i; + continue; + } + ret = scan_for_flag_set(lr->i, magic, + branched, setters, setter_cnt); + if (ret < 0) + return ret; + } + i--; + + if (ops[i].flags & OPF_FLAGS) { + setters[*setter_cnt] = i; + (*setter_cnt)++; + return 0; + } + + if ((ops[i].flags & OPF_JMP) && !(ops[i].flags & OPF_CC)) return -1; } @@ -1622,7 +2123,18 @@ static int scan_for_flag_set(int i) // scan back for cdq, if anything modifies edx, fail static int scan_for_cdq_edx(int i) { - for (; i >= 0; i--) { + while (i >= 0) { + if (g_labels[i][0] != 0) { + if (g_label_refs[i].next != NULL) + return -1; + if (i > 0 && LAST_OP(i - 1)) { + i = g_label_refs[i].i; + continue; + } + return -1; + } + i--; + if (ops[i].op == OP_CDQ) return i; @@ -1635,65 +2147,342 @@ static int scan_for_cdq_edx(int i) return -1; } +static int scan_for_reg_clear(int i, int reg) +{ + while (i >= 0) { + if (g_labels[i][0] != 0) { + if (g_label_refs[i].next != NULL) + return -1; + if (i > 0 && LAST_OP(i - 1)) { + i = g_label_refs[i].i; + continue; + } + return -1; + } + i--; + + if (ops[i].op == OP_XOR + && ops[i].operand[0].lmod == OPLM_DWORD + && ops[i].operand[0].reg == ops[i].operand[1].reg + && ops[i].operand[0].reg == reg) + return i; + + if (ops[i].regmask_dst & (1 << reg)) + return -1; + if (g_labels[i][0] != 0) + return -1; + } + + return -1; +} + // scan for positive, constant esp adjust static int scan_for_esp_adjust(int i, int opcnt, int *adj) { + struct parsed_op *po; + int i_first = i; + *adj = 0; + for (; i < opcnt; i++) { - if (ops[i].op == OP_ADD && ops[i].operand[0].reg == xSP) { - if (ops[i].operand[1].type != OPT_CONST) + po = &ops[i]; + + if (g_labels[i][0] != 0) + break; + + if (po->op == OP_ADD && po->operand[0].reg == xSP) { + if (po->operand[1].type != OPT_CONST) ferr(&ops[i], "non-const esp adjust?\n"); - *adj = ops[i].operand[1].val; + *adj += po->operand[1].val; if (*adj & 3) ferr(&ops[i], "unaligned esp adjust: %x\n", *adj); return i; } + else if (po->op == OP_PUSH) + *adj -= lmod_bytes(po, po->operand[0].lmod); + else if (po->op == OP_POP) + *adj += lmod_bytes(po, po->operand[0].lmod); + else if (po->flags & (OPF_JMP|OPF_TAIL)) { + if (po->op != OP_CALL) + break; + if (po->operand[0].type != OPT_LABEL) + break; + // TODO: should only allow combining __cdecl calls.. + } + } - if ((ops[i].flags & (OPF_JMP|OPF_TAIL)) - || ops[i].op == OP_PUSH || ops[i].op == OP_POP) - return -1; - if (g_labels[i][0] != 0) - return -1; + if (*adj == 4 && ops[i_first].op == OP_POP + && ops[i_first].operand[0].type == OPT_REG + && ops[i_first].operand[0].reg == xCX) + { + // probably 'pop ecx' was used.. + return i_first; } return -1; } -static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) +static void scan_fwd_set_flags(int i, int opcnt, int magic, int flags) +{ + struct parsed_op *po; + int j; + + if (i < 0) + ferr(ops, "%s: followed bad branch?\n", __func__); + + for (; i < opcnt; i++) { + po = &ops[i]; + if (po->cc_scratch == magic) + return; + po->cc_scratch = magic; + po->flags |= flags; + + if ((po->flags & OPF_JMP) && po->op != OP_CALL) { + if (po->btj != NULL) { + // jumptable + for (j = 0; j < po->btj->count; j++) + scan_fwd_set_flags(po->btj->d[j].bt_i, opcnt, magic, flags); + return; + } + + scan_fwd_set_flags(po->bt_i, opcnt, magic, flags); + if (!(po->flags & OPF_CC)) + return; + } + if (po->flags & OPF_TAIL) + return; + } +} + +static int collect_call_args(struct parsed_op *po, int i, + struct parsed_proto *pp, int *save_arg_vars, int arg, + int magic, int need_op_saving, int may_reuse) +{ + struct parsed_proto *pp_tmp; + struct label_ref *lr; + int need_to_save_current; + int ret = 0; + int j; + + if (i < 0) { + ferr(po, "dead label encountered\n"); + return -1; + } + + for (; arg < pp->argc; arg++) + if (pp->arg[arg].reg == NULL) + break; + magic = (magic & 0xffffff) | (arg << 24); + + for (j = i; j >= 0 && arg < pp->argc; ) + { + if (((ops[j].cc_scratch ^ magic) & 0xffffff) == 0) { + if (ops[j].cc_scratch != magic) { + ferr(&ops[j], "arg collect hit same path with diff args for %s\n", + pp->name); + return -1; + } + // ok: have already been here + return 0; + } + ops[j].cc_scratch = magic; + + if (g_labels[j][0] != 0 && g_label_refs[j].i != -1) { + lr = &g_label_refs[j]; + if (lr->next != NULL) + need_op_saving = 1; + for (; lr->next; lr = lr->next) { + if ((ops[lr->i].flags & (OPF_JMP|OPF_CC)) != OPF_JMP) + may_reuse = 1; + ret = collect_call_args(po, lr->i, pp, save_arg_vars, + arg, magic, need_op_saving, may_reuse); + if (ret < 0) + return ret; + } + + if ((ops[lr->i].flags & (OPF_JMP|OPF_CC)) != OPF_JMP) + may_reuse = 1; + if (j > 0 && LAST_OP(j - 1)) { + // follow last branch in reverse + j = lr->i; + continue; + } + need_op_saving = 1; + ret = collect_call_args(po, lr->i, pp, save_arg_vars, + arg, magic, need_op_saving, may_reuse); + if (ret < 0) + return ret; + } + j--; + + if (ops[j].op == OP_CALL) + { + pp_tmp = ops[j].datap; + if (pp_tmp == NULL) + ferr(po, "arg collect hit unparsed call '%s'\n", + ops[j].operand[0].name); + if (may_reuse && pp_tmp->argc_stack > 0) + ferr(po, "arg collect %d/%d hit '%s' with %d stack args\n", + arg, pp->argc, opr_name(&ops[j], 0), pp_tmp->argc_stack); + } + else if (ops[j].op == OP_ADD && ops[j].operand[0].reg == xSP) { + ferr(po, "arg collect %d/%d hit esp adjust\n", + arg, pp->argc); + } + else if (ops[j].op == OP_POP) { + ferr(po, "arg collect %d/%d hit pop\n", arg, pp->argc); + } + else if ((ops[j].flags & (OPF_JMP|OPF_CC)) == (OPF_JMP|OPF_CC)) + { + may_reuse = 1; + } + else if (ops[j].op == OP_PUSH && !(ops[j].flags & OPF_FARG)) + { + pp->arg[arg].datap = &ops[j]; + need_to_save_current = 0; + if (!need_op_saving) { + ret = scan_for_mod(&ops[j], j + 1, i); + need_to_save_current = (ret >= 0); + } + if (need_op_saving || need_to_save_current) { + // mark this push as one that needs operand saving + ops[j].flags &= ~OPF_RMD; + if (ops[j].argnum == 0) { + ops[j].argnum = arg + 1; + *save_arg_vars |= 1 << arg; + } + else if (ops[j].argnum < arg + 1) + ferr(&ops[j], "argnum conflict (%d<%d) for '%s'\n", + ops[j].argnum, arg + 1, pp->name); + } + else if (ops[j].argnum == 0) + ops[j].flags |= OPF_RMD; + + // some PUSHes are reused by different calls on other branches, + // but that can't happen if we didn't branch, so they + // can be removed from future searches (handles nested calls) + if (!may_reuse) + ops[j].flags |= OPF_FARG; + + // next arg + for (arg++; arg < pp->argc; arg++) + if (pp->arg[arg].reg == NULL) + break; + magic = (magic & 0xffffff) | (arg << 24); + } + } + + if (arg < pp->argc) { + ferr(po, "arg collect failed for '%s': %d/%d\n", + pp->name, arg, pp->argc); + ret = -1; + } + return ret; +} + +static void add_label_ref(struct label_ref *lr, int op_i) +{ + struct label_ref *lr_new; + + if (lr->i == -1) { + lr->i = op_i; + return; + } + + lr_new = calloc(1, sizeof(*lr_new)); + lr_new->i = op_i; + lr_new->next = lr->next; + lr->next = lr_new; +} + +static void output_std_flags(FILE *fout, struct parsed_op *po, + int *pfomask, const char *dst_opr_text) +{ + if (*pfomask & (1 << PFO_Z)) { + fprintf(fout, "\n cond_z = (%s%s == 0);", + lmod_cast_u(po, po->operand[0].lmod), dst_opr_text); + *pfomask &= ~(1 << PFO_Z); + } + if (*pfomask & (1 << PFO_S)) { + fprintf(fout, "\n cond_s = (%s%s < 0);", + lmod_cast_s(po, po->operand[0].lmod), dst_opr_text); + *pfomask &= ~(1 << PFO_S); + } +} + +static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) { struct parsed_op *po, *delayed_flag_op = NULL, *tmp_op; struct parsed_opr *last_arith_dst = NULL; - char buf1[256], buf2[256], buf3[256]; + char buf1[256], buf2[256], buf3[256], cast[64]; + const struct parsed_proto *pp_c; struct parsed_proto *pp, *pp_tmp; + struct parsed_data *pd; const char *tmpname; enum parsed_flag_op pfo; int save_arg_vars = 0; int cmp_result_vars = 0; int need_mul_var = 0; + int have_func_ret = 0; + int have_normal_ret = 0; int had_decl = 0; + int label_pending = 0; int regmask_save = 0; int regmask_arg = 0; + int regmask_now = 0; int regmask = 0; int pfomask = 0; + int found = 0; int depth = 0; int no_output; + int i, j, l; int dummy; int arg; - int i, j; int reg; int ret; g_bp_frame = g_sp_frame = g_stack_fsz = 0; + g_stack_frame_used = 0; - ret = proto_parse(fhdr, funcn, &g_func_pp); - if (ret) + g_func_pp = proto_parse(fhdr, funcn); + if (g_func_pp == NULL) ferr(ops, "proto_parse failed for '%s'\n", funcn); - fprintf(fout, "%s %s(", g_func_pp.ret_type, funcn); - for (i = 0; i < g_func_pp.argc; i++) { + fprintf(fout, "%s ", g_func_pp->ret_type.name); + if (g_func_pp->is_stdcall && g_func_pp->argc_reg == 0) + fprintf(fout, "__stdcall "); + if (g_ida_func_attr & IDAFA_NORETURN) + fprintf(fout, "noreturn "); + fprintf(fout, "%s(", funcn); + + for (i = 0; i < g_func_pp->argc; i++) { if (i > 0) fprintf(fout, ", "); - fprintf(fout, "%s a%d", g_func_pp.arg[i].type, i + 1); + if (g_func_pp->arg[i].fptr != NULL) { + // func pointer.. + pp = g_func_pp->arg[i].fptr; + fprintf(fout, "%s (", pp->ret_type.name); + if (pp->is_stdcall && pp->argc_reg == 0) + fprintf(fout, "__stdcall "); + fprintf(fout, "*a%d)(", i + 1); + for (j = 0; j < pp->argc; j++) { + if (j > 0) + fprintf(fout, ", "); + if (pp->arg[j].fptr) + ferr(ops, "nested fptr\n"); + fprintf(fout, "%s", pp->arg[j].type.name); + } + fprintf(fout, ")"); + } + else { + fprintf(fout, "%s a%d", g_func_pp->arg[i].type.name, i + 1); + } } + if (g_func_pp->is_vararg) { + if (i > 0) + fprintf(fout, ", "); + fprintf(fout, "..."); + } + fprintf(fout, ")\n{\n"); // pass1: @@ -1708,10 +2497,12 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) g_bp_frame = 1; ops[0].flags |= OPF_RMD; ops[1].flags |= OPF_RMD; + i = 2; if (ops[2].op == OP_SUB && IS(opr_name(&ops[2], 0), "esp")) { g_stack_fsz = opr_const(&ops[2], 1); ops[2].flags |= OPF_RMD; + i++; } else { // another way msvc builds stack frame.. @@ -1722,25 +2513,42 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) ecx_push++; i++; } + // and another way.. + if (i == 2 && ops[i].op == OP_MOV && ops[i].operand[0].reg == xAX + && ops[i].operand[1].type == OPT_CONST + && ops[i + 1].op == OP_CALL + && IS(opr_name(&ops[i + 1], 0), "__alloca_probe")) + { + g_stack_fsz += ops[i].operand[1].val; + ops[i].flags |= OPF_RMD; + i++; + ops[i].flags |= OPF_RMD; + i++; + } } - i = 2; + found = 0; do { for (; i < opcnt; i++) if (ops[i].op == OP_RET) break; - if (ops[i - 1].op != OP_POP || !IS(opr_name(&ops[i - 1], 0), "ebp")) + if (i == opcnt && (ops[i - 1].flags & OPF_JMP) && found) + break; + + if (ops[i - 1].op == OP_POP && IS(opr_name(&ops[i - 1], 0), "ebp")) + ops[i - 1].flags |= OPF_RMD; + else if (!(g_ida_func_attr & IDAFA_NORETURN)) ferr(&ops[i - 1], "'pop ebp' expected\n"); - ops[i - 1].flags |= OPF_RMD; if (g_stack_fsz != 0) { - if (ops[i - 2].op != OP_MOV - || !IS(opr_name(&ops[i - 2], 0), "esp") - || !IS(opr_name(&ops[i - 2], 1), "ebp")) + if (ops[i - 2].op == OP_MOV + && IS(opr_name(&ops[i - 2], 0), "esp") + && IS(opr_name(&ops[i - 2], 1), "ebp")) { - ferr(&ops[i - 2], "esp restore expected\n"); + ops[i - 2].flags |= OPF_RMD; } - ops[i - 2].flags |= OPF_RMD; + else if (!(g_ida_func_attr & IDAFA_NORETURN)) + ferr(&ops[i - 2], "esp restore expected\n"); if (ecx_push && ops[i - 3].op == OP_POP && IS(opr_name(&ops[i - 3], 0), "ecx")) @@ -1749,6 +2557,7 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) } } + found = 1; i++; } while (i < opcnt); } @@ -1787,70 +2596,158 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) } // pass2: + // - parse calls with labels // - resolve all branches - for (i = 0; i < opcnt; i++) { + for (i = 0; i < opcnt; i++) + { po = &ops[i]; po->bt_i = -1; + po->btj = NULL; + + if (po->flags & OPF_RMD) + continue; + + if (po->op == OP_CALL) { + if (po->operand[0].type == OPT_LABEL) { + tmpname = opr_name(po, 0); + pp_c = proto_parse(fhdr, tmpname); + if (pp_c == NULL) + ferr(po, "proto_parse failed for call '%s'\n", tmpname); + if (pp_c->is_fptr && pp_c->argc_reg != 0) + ferr(po, "fptr call with reg arg\n"); + pp = proto_clone(pp_c); + my_assert_not(pp, NULL); + po->datap = pp; + } + continue; + } + + if (!(po->flags & OPF_JMP) || po->op == OP_RET) + continue; + + if (po->operand[0].type == OPT_REGMEM) { + char *p = strchr(po->operand[0].name, '['); + if (p == NULL) + ferr(po, "unhandled indirect branch\n"); + ret = p - po->operand[0].name; + strncpy(buf1, po->operand[0].name, ret); + buf1[ret] = 0; + + for (j = 0, pd = NULL; j < g_func_pd_cnt; j++) { + if (IS(g_func_pd[j].label, buf1)) { + pd = &g_func_pd[j]; + break; + } + } + if (pd == NULL) + //ferr(po, "label '%s' not parsed?\n", buf1); + goto tailcall; + if (pd->type != OPT_OFFSET) + ferr(po, "label '%s' with non-offset data?\n", buf1); + + // find all labels, link + for (j = 0; j < pd->count; j++) { + for (l = 0; l < opcnt; l++) { + if (g_labels[l][0] && IS(g_labels[l], pd->d[j].u.label)) { + add_label_ref(&g_label_refs[l], i); + pd->d[j].bt_i = l; + break; + } + } + } - if ((po->flags & OPF_RMD) || !(po->flags & OPF_JMP) - || po->op == OP_CALL || po->op == OP_RET) + po->btj = pd; continue; + } - for (j = 0; j < opcnt; j++) { - if (g_labels[j][0] && IS(po->operand[0].name, g_labels[j])) { - po->bt_i = j; - po->lrl = g_label_refs[j]; - g_label_refs[j] = po; + for (l = 0; l < opcnt; l++) { + if (g_labels[l][0] && IS(po->operand[0].name, g_labels[l])) { + add_label_ref(&g_label_refs[l], i); + po->bt_i = l; break; } } - if (po->bt_i == -1) { + if (po->bt_i != -1) + continue; + + if (po->operand[0].type == OPT_LABEL) // assume tail call - po->op = OP_CALL; - po->flags |= OPF_TAIL; - } + goto tailcall; + + ferr(po, "unhandled branch\n"); + +tailcall: + po->op = OP_CALL; + po->flags |= OPF_TAIL; + i--; // reprocess } // pass3: + // - remove dead labels // - process calls for (i = 0; i < opcnt; i++) { + if (g_labels[i][0] != 0 && g_label_refs[i].i == -1) + g_labels[i][0] = 0; + po = &ops[i]; if (po->flags & OPF_RMD) continue; if (po->op == OP_CALL) { - pp = calloc(1, sizeof(*pp)); - my_assert_not(pp, NULL); tmpname = opr_name(po, 0); - if (po->operand[0].type != OPT_LABEL) + pp = po->datap; + if (pp == NULL) { + // indirect call + pp = calloc(1, sizeof(*pp)); + my_assert_not(pp, NULL); ret = scan_for_esp_adjust(i + 1, opcnt, &j); if (ret < 0) ferr(po, "non-__cdecl indirect call unhandled yet\n"); j /= 4; if (j > ARRAY_SIZE(pp->arg)) ferr(po, "esp adjust too large?\n"); - pp->ret_type = "int"; + pp->ret_type.name = strdup("int"); pp->argc = pp->argc_stack = j; for (arg = 0; arg < pp->argc; arg++) - pp->arg[arg].type = "int"; - } - else { - ret = proto_parse(fhdr, tmpname, pp); - if (ret) - ferr(po, "proto_parse failed for call '%s'\n", tmpname); + pp->arg[arg].type.name = strdup("int"); + po->datap = pp; } - ret = scan_for_esp_adjust(i + 1, opcnt, &j); + // look for and make use of esp adjust + ret = -1; + if (!pp->is_stdcall && pp->argc_stack > 0) + ret = scan_for_esp_adjust(i + 1, opcnt, &j); if (ret >= 0) { + if (pp->is_vararg) { + if (j / 4 < pp->argc_stack) + ferr(po, "esp adjust is too small: %x < %x\n", + j, pp->argc_stack * 4); + // modify pp to make it have varargs as normal args + arg = pp->argc; + pp->argc += j / 4 - pp->argc_stack; + for (; arg < pp->argc; arg++) { + pp->arg[arg].type.name = strdup("int"); + pp->argc_stack++; + } + if (pp->argc > ARRAY_SIZE(pp->arg)) + ferr(po, "too many args for '%s'\n", tmpname); + } if (pp->argc_stack != j / 4) - ferr(po, "stack tracking failed: %x %x\n", - pp->argc_stack, j); + ferr(po, "stack tracking failed for '%s': %x %x\n", + tmpname, pp->argc_stack * 4, j); + ops[ret].flags |= OPF_RMD; + // a bit of a hack, but deals with use of + // single adj for multiple calls + ops[ret].operand[1].val -= j; } + else if (pp->is_vararg) + ferr(po, "missing esp_adjust for vararg func '%s'\n", + pp->name); // can't call functions with non-__cdecl callbacks yet for (arg = 0; arg < pp->argc; arg++) { @@ -1861,64 +2758,13 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) } } - for (arg = 0; arg < pp->argc; arg++) - if (pp->arg[arg].reg == NULL) - break; + collect_call_args(po, i, pp, &save_arg_vars, + 0, i + opcnt * 2, 0, 0); - for (j = i; j >= 0 && arg < pp->argc; ) - { - if (g_labels[j][0] != 0) { - if (j > 0 && ((ops[j - 1].flags & OPF_TAIL) - || (ops[j - 1].flags & (OPF_JMP|OPF_CC)) == OPF_JMP)) - { - // follow the branch in reverse - if (g_label_refs[j] == NULL) - ferr(po, "no refs for '%s'?\n", g_labels[j]); - if (g_label_refs[j]->lrl != NULL) - ferr(po, "unhandled multiple fefs to '%s'\n", g_labels[j]); - j = (g_label_refs[j] - ops) + 1; - continue; - } - break; - } - j--; - - if (ops[j].op == OP_CALL) - { - pp_tmp = ops[j].datap; - if (pp_tmp == NULL) - ferr(po, "arg collect hit unparsed call\n"); - if (pp_tmp->argc_stack > 0) - ferr(po, "arg collect hit '%s' with %d stack args\n", - opr_name(&ops[j], 0), pp_tmp->argc_stack); - } - else if ((ops[j].flags & OPF_TAIL) - || (ops[j].flags & (OPF_JMP|OPF_CC)) == OPF_JMP) - { - break; - } - else if (ops[j].op == OP_PUSH) - { - pp->arg[arg].datap = &ops[j]; - ret = scan_for_mod(&ops[j], j + 1, i); - if (ret >= 0) { - // mark this push as one that needs operand saving - ops[j].flags &= ~OPF_RMD; - ops[j].argmask |= 1 << arg; - save_arg_vars |= 1 << arg; - } - else - ops[j].flags |= OPF_RMD; - - // next arg - for (arg++; arg < pp->argc; arg++) - if (pp->arg[arg].reg == NULL) - break; - } - } - if (arg < pp->argc) - ferr(po, "arg collect failed for '%s'\n", tmpname); - po->datap = pp; + if (strstr(pp->ret_type.name, "int64")) + need_mul_var = 1; + if (!(po->flags & OPF_TAIL) && !IS(pp->ret_type.name, "void")) + have_func_ret = 1; } } @@ -1932,8 +2778,17 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) if (po->flags & OPF_RMD) continue; + if (po->op == OP_PUSH && (po->flags & OPF_RSAVE)) { + reg = po->operand[0].reg; + if (!(regmask & (1 << reg))) + // not a reg save after all, rerun scan_for_pop + po->flags &= ~OPF_RSAVE; + else + regmask_save |= 1 << reg; + } + if (po->op == OP_PUSH - && po->argmask == 0 && !(po->flags & OPF_RSAVE) + && po->argnum == 0 && !(po->flags & OPF_RSAVE) && po->operand[0].type == OPT_REG) { reg = po->operand[0].reg; @@ -1942,16 +2797,14 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) depth = 0; ret = scan_for_pop(i + 1, opcnt, - po->operand[0].name, i + opcnt, 0, &depth, 0); + po->operand[0].name, i + opcnt * 3, 0, &depth, 0); if (ret == 1) { if (depth > 1) ferr(po, "too much depth: %d\n", depth); - if (depth > 0) - regmask_save |= 1 << reg; po->flags |= OPF_RMD; scan_for_pop(i + 1, opcnt, po->operand[0].name, - i + opcnt * 2, 0, &depth, 1); + i + opcnt * 4, 0, &depth, 1); continue; } ret = scan_for_pop_ret(i + 1, opcnt, po->operand[0].name, 0); @@ -1968,33 +2821,59 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) } } - regmask |= po->regmask_src | po->regmask_dst; + regmask_now = po->regmask_src | po->regmask_dst; + if (regmask_now & (1 << xBP)) { + if (g_bp_frame && !(po->flags & OPF_EBP_S)) { + if (po->regmask_dst & (1 << xBP)) + // compiler decided to drop bp frame and use ebp as scratch + scan_fwd_set_flags(i, opcnt, i + opcnt * 5, OPF_EBP_S); + else + regmask_now &= ~(1 << xBP); + } + } + + regmask |= regmask_now; if (po->flags & OPF_CC) { - ret = scan_for_flag_set(i - 1); - if (ret < 0) - ferr(po, "unable to trace flag setter\n"); + int setters[16], cnt = 0, branched = 0; - tmp_op = &ops[ret]; // flag setter - pfo = split_cond(po, po->op, &dummy); - pfomask = 0; + ret = scan_for_flag_set(i, i + opcnt * 6, + &branched, setters, &cnt); + if (ret < 0 || cnt <= 0) + ferr(po, "unable to trace flag setter(s)\n"); + if (cnt > ARRAY_SIZE(setters)) + ferr(po, "too many flag setters\n"); - // to get nicer code, we try to delay test and cmp; - // if we can't because of operand modification, or if we - // have math op, make it calculate flags explicitly - if (tmp_op->op == OP_TEST || tmp_op->op == OP_CMP) { - if (scan_for_mod(tmp_op, ret + 1, i) >= 0) - pfomask = 1 << pfo; - } - else { - if ((pfo != PFO_Z && pfo != PFO_S && pfo != PFO_P) - || scan_for_mod_opr0(tmp_op, ret + 1, i) >= 0) - pfomask = 1 << pfo; - } - if (pfomask) { - tmp_op->pfomask |= pfomask; - cmp_result_vars |= pfomask; + pfo = split_cond(po, po->op, &dummy); + for (j = 0; j < cnt; j++) + { + tmp_op = &ops[setters[j]]; // flag setter + pfomask = 0; + + // to get nicer code, we try to delay test and cmp; + // if we can't because of operand modification, or if we + // have math op, or branch, make it calculate flags explicitly + if (tmp_op->op == OP_TEST || tmp_op->op == OP_CMP) { + if (branched || scan_for_mod(tmp_op, setters[j] + 1, i) >= 0) + pfomask = 1 << pfo; + } + else if (tmp_op->op == OP_CMPS) { + pfomask = 1 << PFO_Z; + } + else { + // see if we'll be able to handle based on op result + if ((tmp_op->op != OP_AND && tmp_op->op != OP_OR + && pfo != PFO_Z && pfo != PFO_S && pfo != PFO_P) + || branched + || scan_for_mod_opr0(tmp_op, setters[j] + 1, i) >= 0) + pfomask = 1 << pfo; + } + if (pfomask) { + tmp_op->pfomask |= pfomask; + cmp_result_vars |= pfomask; + } + // note: may overwrite, currently not a problem po->datap = tmp_op; } @@ -2009,46 +2888,78 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) else if (po->op == OP_CALL && po->operand[0].type != OPT_LABEL) { pp = po->datap; my_assert_not(pp, NULL); - fprintf(fout, " %s (*icall%d)(", pp->ret_type, i); + fprintf(fout, " %s (*icall%d)(", pp->ret_type.name, i); for (j = 0; j < pp->argc; j++) { if (j > 0) fprintf(fout, ", "); - fprintf(fout, "%s a%d", pp->arg[j].type, j + 1); + fprintf(fout, "%s a%d", pp->arg[j].type.name, j + 1); } fprintf(fout, ");\n"); } + else if (po->op == OP_RET) + have_normal_ret = 1; } - // declare stack frame + // output LUTs/jumptables + for (i = 0; i < g_func_pd_cnt; i++) { + pd = &g_func_pd[i]; + fprintf(fout, " static const "); + if (pd->type == OPT_OFFSET) { + fprintf(fout, "void *jt_%s[] =\n { ", pd->label); + + for (j = 0; j < pd->count; j++) { + if (j > 0) + fprintf(fout, ", "); + fprintf(fout, "&&%s", pd->d[j].u.label); + } + } + else { + fprintf(fout, "%s %s[] =\n { ", + lmod_type_u(ops, pd->lmod), pd->label); + + for (j = 0; j < pd->count; j++) { + if (j > 0) + fprintf(fout, ", "); + fprintf(fout, "%u", pd->d[j].u.val); + } + } + fprintf(fout, " };\n"); + } + + // declare stack frame, va_arg if (g_stack_fsz) fprintf(fout, " union { u32 d[%d]; u16 w[%d]; u8 b[%d]; } sf;\n", (g_stack_fsz + 3) / 4, (g_stack_fsz + 1) / 2, g_stack_fsz); + if (g_func_pp->is_vararg) + fprintf(fout, " va_list ap;\n"); + // declare arg-registers - for (i = 0; i < g_func_pp.argc; i++) { - if (g_func_pp.arg[i].reg != NULL) { + for (i = 0; i < g_func_pp->argc; i++) { + if (g_func_pp->arg[i].reg != NULL) { reg = char_array_i(regs_r32, - ARRAY_SIZE(regs_r32), g_func_pp.arg[i].reg); + ARRAY_SIZE(regs_r32), g_func_pp->arg[i].reg); if (reg < 0) - ferr(ops, "arg '%s' is not a reg?\n", g_func_pp.arg[i].reg); + ferr(ops, "arg '%s' is not a reg?\n", g_func_pp->arg[i].reg); regmask_arg |= 1 << reg; fprintf(fout, " u32 %s = (u32)a%d;\n", - g_func_pp.arg[i].reg, i + 1); + g_func_pp->arg[i].reg, i + 1); had_decl = 1; } } // declare other regs - special case for eax - if (!((regmask | regmask_arg) & 1) && !IS(g_func_pp.ret_type, "void")) { + if (!((regmask | regmask_arg) & 1) + && (have_func_ret || have_normal_ret) + && !IS(g_func_pp->ret_type.name, "void")) + { fprintf(fout, " u32 eax = 0;\n"); had_decl = 1; } regmask &= ~regmask_arg; regmask &= ~(1 << xSP); - if (g_bp_frame) - regmask &= ~(1 << xBP); if (regmask) { for (reg = 0; reg < 8; reg++) { if (regmask & (1 << reg)) { @@ -2093,11 +3004,22 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) if (had_decl) fprintf(fout, "\n"); + if (g_func_pp->is_vararg) { + if (g_func_pp->argc_stack == 0) + ferr(ops, "vararg func without stack args?\n"); + fprintf(fout, " va_start(ap, a%d);\n", g_func_pp->argc); + } + // output ops for (i = 0; i < opcnt; i++) { - if (g_labels[i][0] != 0 && g_label_refs[i] != NULL) + if (g_labels[i][0] != 0) { fprintf(fout, "\n%s:\n", g_labels[i]); + label_pending = 1; + + delayed_flag_op = NULL; + last_arith_dst = NULL; + } po = &ops[i]; if (po->flags & OPF_RMD) @@ -2116,6 +3038,7 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) int is_inv = 0; pfo = split_cond(po, po->op, &is_inv); + tmp_op = po->datap; // we go through all this trouble to avoid using parsed_flag_op, // which makes generated code much nicer @@ -2125,17 +3048,18 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) is_delayed = 1; } else if (last_arith_dst != NULL - && (pfo == PFO_Z || pfo == PFO_S || pfo == PFO_P)) + && (pfo == PFO_Z || pfo == PFO_S || pfo == PFO_P + || (tmp_op && (tmp_op->op == OP_AND || tmp_op->op == OP_OR)) + )) { - out_src_opr(buf3, sizeof(buf3), po, last_arith_dst, 0); + out_src_opr_u32(buf3, sizeof(buf3), po, last_arith_dst); out_test_for_cc(buf1, sizeof(buf1), po, pfo, is_inv, last_arith_dst->lmod, buf3); is_delayed = 1; } - else if (po->datap != NULL) { - // use preprocessed results - tmp_op = po->datap; - if (!tmp_op || !(tmp_op->pfomask & (1 << pfo))) + else if (tmp_op != NULL) { + // use preprocessed flag calc results + if (!(tmp_op->pfomask & (1 << pfo))) ferr(po, "not prepared for pfo %d\n", pfo); // note: is_inv was not yet applied @@ -2170,10 +3094,10 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) case OP_MOV: assert_operand_cnt(2); propagate_lmod(po, &po->operand[0], &po->operand[1]); - fprintf(fout, " %s = %s%s;", - out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]), - po->operand[0].is_ptr ? "(void *)" : "", - out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0)); + out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]); + fprintf(fout, " %s = %s;", buf1, + out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], + po->operand[0].is_ptr ? "(void *)" : "", 0)); break; case OP_LEA: @@ -2181,14 +3105,15 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) po->operand[1].lmod = OPLM_DWORD; // always fprintf(fout, " %s = %s;", out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]), - out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 1)); + out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], + NULL, 1)); break; case OP_MOVZX: assert_operand_cnt(2); fprintf(fout, " %s = %s;", out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]), - out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0)); + out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1])); break; case OP_MOVSX: @@ -2203,10 +3128,10 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) default: ferr(po, "invalid src lmod: %d\n", po->operand[1].lmod); } - fprintf(fout, " %s = %s%s;", + fprintf(fout, " %s = %s;", out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]), - buf3, - out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0)); + out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], + buf3, 0)); break; case OP_NOT: @@ -2219,7 +3144,7 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) assert_operand_cnt(2); fprintf(fout, " %s = (s32)%s >> 31;", out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]), - out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0)); + out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1])); strcpy(g_comment, "cdq"); break; @@ -2261,6 +3186,35 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) } break; + case OP_CMPS: + // assumes DF=0 + // repe ~ repeat while ZF=1 + assert_operand_cnt(3); + j = lmod_bytes(po, po->operand[0].lmod); + strcpy(buf1, lmod_cast_u_ptr(po, po->operand[0].lmod)); + if (po->flags & OPF_REP) { + fprintf(fout, + " for (; ecx != 0; ecx--, edi += %d, esi += %d)\n", + j, j); + fprintf(fout, + " if ((cond_z = (%sedi == %sesi)) %s 0)\n", + buf1, buf1, (po->flags & OPF_REPZ) ? "==" : "!="); + fprintf(fout, + " break;"); + snprintf(g_comment, sizeof(g_comment), "rep%s cmps", + (po->flags & OPF_REPZ) ? "e" : "ne"); + } + else { + fprintf(fout, + " cond_z = (%sedi = %sesi); edi += %d; esi += %d;", + buf1, buf1, j, j); + strcpy(g_comment, "cmps"); + } + pfomask &= ~(1 << PFO_Z); + last_arith_dst = NULL; + delayed_flag_op = NULL; + break; + // arithmetic w/flags case OP_ADD: case OP_SUB: @@ -2268,14 +3222,44 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) case OP_OR: propagate_lmod(po, &po->operand[0], &po->operand[1]); // fallthrough - case OP_SHL: - case OP_SHR: dualop_arith: assert_operand_cnt(2); fprintf(fout, " %s %s= %s;", out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]), op_to_c(po), - out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0)); + out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1])); + output_std_flags(fout, po, &pfomask, buf1); + last_arith_dst = &po->operand[0]; + delayed_flag_op = NULL; + break; + + case OP_SHL: + case OP_SHR: + assert_operand_cnt(2); + out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]); + if (pfomask & (1 << PFO_C)) { + if (po->operand[1].type == OPT_CONST) { + l = lmod_bytes(po, po->operand[0].lmod) * 8; + j = po->operand[1].val; + j %= l; + if (j != 0) { + if (po->op == OP_SHL) + j = l - j; + else + j -= 1; + fprintf(fout, " cond_c = (%s & 0x%02x) ? 1 : 0;\n", + buf1, 1 << j); + } + else + ferr(po, "zero shift?\n"); + } + else + ferr(po, "TODO\n"); + pfomask &= ~(1 << PFO_C); + } + fprintf(fout, " %s %s= %s;", buf1, op_to_c(po), + out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1])); + output_std_flags(fout, po, &pfomask, buf1); last_arith_dst = &po->operand[0]; delayed_flag_op = NULL; break; @@ -2285,7 +3269,8 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]); fprintf(fout, " %s = %s%s >> %s;", buf1, lmod_cast_s(po, po->operand[0].lmod), buf1, - out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0)); + out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1])); + output_std_flags(fout, po, &pfomask, buf1); last_arith_dst = &po->operand[0]; delayed_flag_op = NULL; break; @@ -2305,6 +3290,7 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) } else ferr(po, "TODO\n"); + output_std_flags(fout, po, &pfomask, buf1); last_arith_dst = &po->operand[0]; delayed_flag_op = NULL; break; @@ -2326,10 +3312,20 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) case OP_SBB: assert_operand_cnt(2); propagate_lmod(po, &po->operand[0], &po->operand[1]); - fprintf(fout, " %s %s= %s + cond_c;", - out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]), - op_to_c(po), - out_src_opr(buf2, sizeof(buf2), po, &po->operand[1], 0)); + out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]); + if (po->op == OP_SBB + && IS(po->operand[0].name, po->operand[1].name)) + { + // avoid use of unitialized var + fprintf(fout, " %s = -cond_c;", buf1); + // carry remains what it was + pfomask &= ~(1 << PFO_C); + } + else { + fprintf(fout, " %s %s= %s + cond_c;", buf1, op_to_c(po), + out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[1])); + } + output_std_flags(fout, po, &pfomask, buf1); last_arith_dst = &po->operand[0]; delayed_flag_op = NULL; break; @@ -2345,13 +3341,14 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) strcpy(buf2, po->op == OP_INC ? "+" : "-"); fprintf(fout, " %s %s= 1;", buf1, buf2); } + output_std_flags(fout, po, &pfomask, buf1); last_arith_dst = &po->operand[0]; delayed_flag_op = NULL; break; case OP_NEG: out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]); - out_src_opr(buf2, sizeof(buf2), po, &po->operand[0], 0); + out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[0]); fprintf(fout, " %s = -%s%s;", buf1, lmod_cast_s(po, po->operand[0].lmod), buf2); last_arith_dst = &po->operand[0]; @@ -2363,8 +3360,10 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) break; case OP_IMUL: - if (po->operand_cnt == 2) + if (po->operand_cnt == 2) { + propagate_lmod(po, &po->operand[0], &po->operand[1]); goto dualop_arith; + } if (po->operand_cnt == 3) ferr(po, "TODO imul3\n"); // fallthrough @@ -2372,7 +3371,7 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) assert_operand_cnt(1); strcpy(buf1, po->op == OP_IMUL ? "(s64)(s32)" : "(u64)"); fprintf(fout, " mul_tmp = %seax * %s%s;\n", buf1, buf1, - out_src_opr(buf2, sizeof(buf2), po, &po->operand[0], 0)); + out_src_opr_u32(buf2, sizeof(buf2), po, &po->operand[0])); fprintf(fout, " edx = mul_tmp >> 32;\n"); fprintf(fout, " eax = mul_tmp;"); last_arith_dst = NULL; @@ -2386,8 +3385,12 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) ferr(po, "unhandled lmod %d\n", po->operand[0].lmod); // 32bit division is common, look for it - if (scan_for_cdq_edx(i - 1) >= 0) { - out_src_opr(buf1, sizeof(buf1), po, &po->operand[0], 0); + if (po->op == OP_DIV) + ret = scan_for_reg_clear(i, xDX); + else + ret = scan_for_cdq_edx(i); + if (ret >= 0) { + out_src_opr_u32(buf1, sizeof(buf1), po, &po->operand[0]); strcpy(buf2, lmod_cast(po, po->operand[0].lmod, po->op == OP_IDIV)); fprintf(fout, " edx = %seax %% %s%s;\n", buf2, buf2, buf1); @@ -2414,6 +3417,7 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) } else no_output = 1; + last_arith_dst = NULL; delayed_flag_op = po; break; @@ -2426,8 +3430,20 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) case OP_JMP: assert_operand_cnt(1); - if (po->operand[0].type != OPT_LABEL) - ferr(po, "unhandled call type\n"); + last_arith_dst = NULL; + delayed_flag_op = NULL; + + if (po->operand[0].type == OPT_REGMEM) { + ret = sscanf(po->operand[0].name, "%[^[][%[^*]*4]", + buf1, buf2); + if (ret != 2) + ferr(po, "parse failure for jmp '%s'\n", + po->operand[0].name); + fprintf(fout, " goto *jt_%s[%s];", buf1, buf2); + break; + } + else if (po->operand[0].type != OPT_LABEL) + ferr(po, "unhandled jmp type\n"); fprintf(fout, " goto %s;", po->operand[0].name); break; @@ -2440,16 +3456,27 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) if (po->operand[0].type != OPT_LABEL) fprintf(fout, " icall%d = (void *)%s;\n", i, - out_src_opr(buf1, sizeof(buf1), po, &po->operand[0], 0)); + out_src_opr_u32(buf1, sizeof(buf1), po, &po->operand[0])); fprintf(fout, " "); - if (!IS(pp->ret_type, "void")) { + if (strstr(pp->ret_type.name, "int64")) { if (po->flags & OPF_TAIL) - fprintf(fout, "return "); - else + ferr(po, "int64 and tail?\n"); + fprintf(fout, "mul_tmp = "); + } + else if (!IS(pp->ret_type.name, "void")) { + if (po->flags & OPF_TAIL) { + if (!IS(g_func_pp->ret_type.name, "void")) { + fprintf(fout, "return "); + if (g_func_pp->ret_type.is_ptr != pp->ret_type.is_ptr) + fprintf(fout, "(%s)", g_func_pp->ret_type.name); + } + } + else { fprintf(fout, "eax = "); - if (strchr(pp->ret_type, '*')) - fprintf(fout, "(u32)"); + if (pp->ret_type.is_ptr) + fprintf(fout, "(u32)"); + } } if (po->operand[0].type != OPT_LABEL) { @@ -2458,18 +3485,20 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) else { if (pp->name[0] == 0) ferr(po, "missing pp->name\n"); - fprintf(fout, "%s(", pp->name); + fprintf(fout, "%s%s(", pp->name, + pp->has_structarg ? "_sa" : ""); } for (arg = 0; arg < pp->argc; arg++) { if (arg > 0) fprintf(fout, ", "); - if (strchr(pp->arg[arg].type, '*')) - fprintf(fout, "(%s)", pp->arg[arg].type); + cast[0] = 0; + if (pp->arg[arg].type.is_ptr) + snprintf(cast, sizeof(cast), "(%s)", pp->arg[arg].type.name); if (pp->arg[arg].reg != NULL) { - fprintf(fout, "%s", pp->arg[arg].reg); + fprintf(fout, "%s%s", cast, pp->arg[arg].reg); continue; } @@ -2477,57 +3506,84 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) tmp_op = pp->arg[arg].datap; if (tmp_op == NULL) ferr(po, "parsed_op missing for arg%d\n", arg); - if (tmp_op->argmask) { - fprintf(fout, "s_a%d", arg + 1); + if (tmp_op->argnum != 0) { + fprintf(fout, "%ss_a%d", cast, tmp_op->argnum); } else { fprintf(fout, "%s", out_src_opr(buf1, sizeof(buf1), - tmp_op, &tmp_op->operand[0], 0)); + tmp_op, &tmp_op->operand[0], cast, 0)); } } fprintf(fout, ");"); + if (strstr(pp->ret_type.name, "int64")) { + fprintf(fout, "\n"); + fprintf(fout, " edx = mul_tmp >> 32;\n"); + fprintf(fout, " eax = mul_tmp;"); + } + if (po->flags & OPF_TAIL) { strcpy(g_comment, "tailcall"); - if (IS(pp->ret_type, "void")) + ret = 0; + if (i == opcnt - 1) + ret = 0; + else if (IS(pp->ret_type.name, "void")) + ret = 1; + else if (IS(g_func_pp->ret_type.name, "void")) + ret = 1; + // else already handled as 'return f()' + + if (ret) { + if (!IS(g_func_pp->ret_type.name, "void")) + ferr(po, "int func -> void func tailcall?\n"); fprintf(fout, "\n return;"); + strcpy(g_comment, "^ tailcall"); + } } delayed_flag_op = NULL; last_arith_dst = NULL; break; case OP_RET: - if (IS(g_func_pp.ret_type, "void")) - fprintf(fout, " return;"); - else if (strchr(g_func_pp.ret_type, '*')) + if (g_func_pp->is_vararg) + fprintf(fout, " va_end(ap);\n"); + + if (IS(g_func_pp->ret_type.name, "void")) { + if (i != opcnt - 1 || label_pending) + fprintf(fout, " return;"); + } + else if (g_func_pp->ret_type.is_ptr) { fprintf(fout, " return (%s)eax;", - g_func_pp.ret_type); + g_func_pp->ret_type.name); + } else fprintf(fout, " return eax;"); + + last_arith_dst = NULL; + delayed_flag_op = NULL; break; case OP_PUSH: - if (po->argmask) { + if (po->argnum != 0) { // special case - saved func arg - out_src_opr(buf1, sizeof(buf1), po, &po->operand[0], 0); - for (j = 0; j < 32; j++) { - if (po->argmask & (1 << j)) - fprintf(fout, " s_a%d = %s;", j + 1, buf1); - } + out_src_opr_u32(buf1, sizeof(buf1), po, &po->operand[0]); + fprintf(fout, " s_a%d = %s;", po->argnum, buf1); break; } else if (po->flags & OPF_RSAVE) { - out_src_opr(buf1, sizeof(buf1), po, &po->operand[0], 0); + out_src_opr_u32(buf1, sizeof(buf1), po, &po->operand[0]); fprintf(fout, " s_%s = %s;", buf1, buf1); break; } - ferr(po, "stray push encountered\n"); + if (!(g_ida_func_attr & IDAFA_NORETURN)) + ferr(po, "stray push encountered\n"); + no_output = 1; break; case OP_POP: if (po->flags & OPF_RSAVE) { - out_src_opr(buf1, sizeof(buf1), po, &po->operand[0], 0); + out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]); fprintf(fout, " %s = s_%s;", buf1, buf1); break; } @@ -2535,6 +3591,7 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) break; case OP_NOP: + no_output = 1; break; default: @@ -2552,8 +3609,15 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) if (!no_output) fprintf(fout, "\n"); + // some sanity checking + if ((po->flags & OPF_REP) && po->op != OP_STOS + && po->op != OP_MOVS && po->op != OP_CMPS) + ferr(po, "unexpected rep\n"); + if ((po->flags & (OPF_REPZ|OPF_REPNZ)) && po->op != OP_CMPS) + ferr(po, "unexpected repz/repnz\n"); + if (pfomask != 0) - ferr(po, "missed flag calc, pfomask=%x\n", pfomask); + ferr(po, "missed flag calc, pfomask=%x\n", pfomask); // see is delayed flag stuff is still valid if (delayed_flag_op != NULL && delayed_flag_op != po) { @@ -2565,21 +3629,35 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) if (is_opr_modified(last_arith_dst, po)) last_arith_dst = NULL; } + + label_pending = 0; } + if (g_stack_fsz && !g_stack_frame_used) + fprintf(fout, " (void)sf;\n"); + fprintf(fout, "}\n\n"); // cleanup for (i = 0; i < opcnt; i++) { + struct label_ref *lr, *lr_del; + + lr = g_label_refs[i].next; + while (lr != NULL) { + lr_del = lr; + lr = lr->next; + free(lr_del); + } + g_label_refs[i].i = -1; + g_label_refs[i].next = NULL; + if (ops[i].op == OP_CALL) { pp = ops[i].datap; - if (pp) { + if (pp) proto_release(pp); - free(pp); - } } } - proto_release(&g_func_pp); + g_func_pp = NULL; } static void set_label(int i, const char *name) @@ -2594,8 +3672,8 @@ static void set_label(int i, const char *name) if (len > sizeof(g_labels[0]) - 1) aerr("label '%s' too long: %d\n", name, len); - if (g_labels[i][0] != 0) - aerr("dupe label '%s'?\n", name); + if (g_labels[i][0] != 0 && !IS_START(g_labels[i], "algn_")) + aerr("dupe label '%s' vs '%s'?\n", name, g_labels[i]); memcpy(g_labels[i], name, len); g_labels[i][len] = 0; } @@ -2620,29 +3698,127 @@ static char *next_word_s(char *w, size_t wsize, char *s) return s + i; } +struct chunk_item { + char *name; + long fptr; + int asmln; +}; + +static struct chunk_item *func_chunks; +static int func_chunk_cnt; +static int func_chunk_alloc; + +static void add_func_chunk(FILE *fasm, const char *name, int line) +{ + if (func_chunk_cnt >= func_chunk_alloc) { + func_chunk_alloc *= 2; + func_chunks = realloc(func_chunks, + func_chunk_alloc * sizeof(func_chunks[0])); + my_assert_not(func_chunks, NULL); + } + func_chunks[func_chunk_cnt].fptr = ftell(fasm); + func_chunks[func_chunk_cnt].name = strdup(name); + func_chunks[func_chunk_cnt].asmln = line; + func_chunk_cnt++; +} + +static int cmp_chunks(const void *p1, const void *p2) +{ + const struct chunk_item *c1 = p1, *c2 = p2; + return strcmp(c1->name, c2->name); +} + static int cmpstringp(const void *p1, const void *p2) { return strcmp(*(char * const *)p1, *(char * const *)p2); } +static void scan_ahead(FILE *fasm) +{ + char words[2][256]; + char line[256]; + long oldpos; + int oldasmln; + int wordc; + char *p; + int i; + + oldpos = ftell(fasm); + oldasmln = asmln; + + while (fgets(line, sizeof(line), fasm)) + { + wordc = 0; + asmln++; + + p = sskip(line); + if (*p == 0) + continue; + + if (*p == ';') + { + // get rid of random tabs + for (i = 0; line[i] != 0; i++) + if (line[i] == '\t') + line[i] = ' '; + + if (p[2] == 'S' && IS_START(p, "; START OF FUNCTION CHUNK FOR ")) + { + p += 30; + next_word(words[0], sizeof(words[0]), p); + if (words[0][0] == 0) + aerr("missing name for func chunk?\n"); + + add_func_chunk(fasm, words[0], asmln); + } + continue; + } // *p == ';' + + for (wordc = 0; wordc < ARRAY_SIZE(words); wordc++) { + words[wordc][0] = 0; + p = sskip(next_word_s(words[wordc], sizeof(words[0]), p)); + if (*p == 0 || *p == ';') { + wordc++; + break; + } + } + + if (wordc == 2 && IS(words[1], "ends")) + break; + } + + fseek(fasm, oldpos, SEEK_SET); + asmln = oldasmln; +} + int main(int argc, char *argv[]) { FILE *fout, *fasm, *frlist; + struct parsed_data *pd = NULL; + int pd_alloc = 0; + char **rlist = NULL; + int rlist_len = 0; + int rlist_alloc = 0; + int func_chunks_used = 0; + int func_chunks_sorted = 0; + int func_chunk_i = -1; + long func_chunk_ret = 0; + int func_chunk_ret_ln = 0; + int scanned_ahead = 0; char line[256]; - char words[16][256]; - int ida_func_attr = 0; + char words[20][256]; + enum opr_lenmod lmod; int in_func = 0; + int pending_endp = 0; int skip_func = 0; int skip_warned = 0; int eq_alloc; - char **rlist = NULL; - int rlist_len = 0; - int rlist_alloc = 0; int verbose = 0; int arg_out; int arg = 1; int pi = 0; - int i, len; + int i, j; + int ret, len; char *p; int wordc; @@ -2673,6 +3849,12 @@ int main(int argc, char *argv[]) // needs special handling.. rlist[rlist_len++] = "__alloca_probe"; + func_chunk_alloc = 32; + func_chunks = malloc(func_chunk_alloc * sizeof(func_chunks[0])); + my_assert_not(func_chunks, NULL); + + memset(words, 0, sizeof(words)); + for (; arg < argc; arg++) { frlist = fopen(argv[arg], "r"); my_assert_not(frlist, NULL); @@ -2708,67 +3890,133 @@ int main(int argc, char *argv[]) g_eqs = malloc(eq_alloc * sizeof(g_eqs[0])); my_assert_not(g_eqs, NULL); + for (i = 0; i < ARRAY_SIZE(g_label_refs); i++) { + g_label_refs[i].i = -1; + g_label_refs[i].next = NULL; + } + while (fgets(line, sizeof(line), fasm)) { + wordc = 0; asmln++; p = sskip(line); if (*p == 0) continue; - if (*p == ';') { - static const char *attrs[] = { - "bp-based frame", - "library function", - "static", - "noreturn", - "thunk", - "fpd=", - }; - if (p[2] != 'A' || strncmp(p, "; Attributes:", 13) != 0) - continue; + // get rid of random tabs + for (i = 0; line[i] != 0; i++) + if (line[i] == '\t') + line[i] = ' '; - // parse IDA's attribute-list comment - ida_func_attr = 0; - p = sskip(p + 13); - // get rid of random tabs - for (i = 0; p[i] != 0; i++) - if (p[i] == '\t') - p[i] = ' '; - - for (; *p != 0; p = sskip(p)) { - for (i = 0; i < ARRAY_SIZE(attrs); i++) { - if (!strncmp(p, attrs[i], strlen(attrs[i]))) { - ida_func_attr |= 1 << i; - p += strlen(attrs[i]); + if (*p == ';') + { + if (p[2] == '=' && IS_START(p, "; =============== S U B")) + goto do_pending_endp; // eww.. + + if (p[2] == 'A' && IS_START(p, "; Attributes:")) + { + static const char *attrs[] = { + "bp-based frame", + "library function", + "static", + "noreturn", + "thunk", + "fpd=", + }; + + // parse IDA's attribute-list comment + g_ida_func_attr = 0; + p = sskip(p + 13); + + for (; *p != 0; p = sskip(p)) { + for (i = 0; i < ARRAY_SIZE(attrs); i++) { + if (!strncmp(p, attrs[i], strlen(attrs[i]))) { + g_ida_func_attr |= 1 << i; + p += strlen(attrs[i]); + break; + } + } + if (i == ARRAY_SIZE(attrs)) { + anote("unparsed IDA attr: %s\n", p); break; } + if (IS(attrs[i], "fpd=")) { + p = next_word(words[0], sizeof(words[0]), p); + // ignore for now.. + } } - if (i == ARRAY_SIZE(attrs)) { - anote("unparsed IDA attr: %s\n", p); - break; + } + else if (p[2] == 'S' && IS_START(p, "; START OF FUNCTION CHUNK FOR ")) + { + p += 30; + next_word(words[0], sizeof(words[0]), p); + if (words[0][0] == 0) + aerr("missing name for func chunk?\n"); + + if (!scanned_ahead) { + add_func_chunk(fasm, words[0], asmln); + func_chunks_sorted = 0; } - if (IS(attrs[i], "fpd=")) { - p = next_word(words[0], sizeof(words[0]), p); - // ignore for now.. + } + else if (p[2] == 'E' && IS_START(p, "; END OF FUNCTION CHUNK")) + { + if (func_chunk_i >= 0) { + if (func_chunk_i < func_chunk_cnt + && IS(func_chunks[func_chunk_i].name, g_func)) + { + // move on to next chunk + ret = fseek(fasm, func_chunks[func_chunk_i].fptr, SEEK_SET); + if (ret) + aerr("seek failed for '%s' chunk #%d\n", + g_func, func_chunk_i); + asmln = func_chunks[func_chunk_i].asmln; + func_chunk_i++; + } + else { + if (func_chunk_ret == 0) + aerr("no return from chunk?\n"); + fseek(fasm, func_chunk_ret, SEEK_SET); + asmln = func_chunk_ret_ln; + func_chunk_ret = 0; + pending_endp = 1; + } + } + } + else if (p[2] == 'F' && IS_START(p, "; FUNCTION CHUNK AT ")) { + func_chunks_used = 1; + p += 20; + if (IS_START(g_func, "sub_")) { + unsigned long addr = strtoul(p, NULL, 16); + unsigned long f_addr = strtoul(g_func + 4, NULL, 16); + if (addr > f_addr && !scanned_ahead) { + anote("scan_ahead caused by '%s', addr %lx\n", + g_func, addr); + scan_ahead(fasm); + scanned_ahead = 1; + func_chunks_sorted = 0; + } } } continue; - } + } // *p == ';' parse_words: - memset(words, 0, sizeof(words)); - for (wordc = 0; wordc < 16; wordc++) { + for (i = wordc; i < ARRAY_SIZE(words); i++) + words[i][0] = 0; + for (wordc = 0; wordc < ARRAY_SIZE(words); wordc++) { p = sskip(next_word_s(words[wordc], sizeof(words[0]), p)); if (*p == 0 || *p == ';') { wordc++; break; } } + if (*p != 0 && *p != ';') + aerr("too many words\n"); // alow asm patches in comments - if (*p == ';' && IS_START(p, "; sctpatch: ")) { - p = sskip(p + 12); + if (*p == ';' && IS_START(p, "; sctpatch:")) { + p = sskip(p + 11); if (*p == 0 || *p == ';') continue; goto parse_words; // lame @@ -2789,12 +4037,97 @@ parse_words: continue; } +do_pending_endp: + // do delayed endp processing to collect switch jumptables + if (pending_endp) { + if (in_func && !skip_func && wordc >= 2 + && ((words[0][0] == 'd' && words[0][2] == 0) + || (words[1][0] == 'd' && words[1][2] == 0))) + { + i = 1; + if (words[1][0] == 'd' && words[1][2] == 0) { + // label + if (g_func_pd_cnt >= pd_alloc) { + pd_alloc = pd_alloc * 2 + 16; + g_func_pd = realloc(g_func_pd, + sizeof(g_func_pd[0]) * pd_alloc); + my_assert_not(g_func_pd, NULL); + } + pd = &g_func_pd[g_func_pd_cnt]; + g_func_pd_cnt++; + memset(pd, 0, sizeof(*pd)); + strcpy(pd->label, words[0]); + pd->type = OPT_CONST; + pd->lmod = lmod_from_directive(words[1]); + i = 2; + } + else { + lmod = lmod_from_directive(words[0]); + if (lmod != pd->lmod) + aerr("lmod change? %d->%d\n", pd->lmod, lmod); + } + + if (pd->count_alloc < pd->count + wordc) { + pd->count_alloc = pd->count_alloc * 2 + 14 + wordc; + pd->d = realloc(pd->d, sizeof(pd->d[0]) * pd->count_alloc); + my_assert_not(pd->d, NULL); + } + for (; i < wordc; i++) { + if (IS(words[i], "offset")) { + pd->type = OPT_OFFSET; + i++; + } + p = strchr(words[i], ','); + if (p != NULL) + *p = 0; + if (pd->type == OPT_OFFSET) + pd->d[pd->count].u.label = strdup(words[i]); + else + pd->d[pd->count].u.val = parse_number(words[i]); + pd->d[pd->count].bt_i = -1; + pd->count++; + } + continue; + } + + if (in_func && !skip_func) + gen_func(fout, g_fhdr, g_func, pi); + + pending_endp = 0; + in_func = 0; + g_ida_func_attr = 0; + skip_warned = 0; + skip_func = 0; + g_func[0] = 0; + func_chunks_used = 0; + func_chunk_i = -1; + if (pi != 0) { + memset(&ops, 0, pi * sizeof(ops[0])); + memset(g_labels, 0, pi * sizeof(g_labels[0])); + pi = 0; + } + g_eqcnt = 0; + for (i = 0; i < g_func_pd_cnt; i++) { + pd = &g_func_pd[i]; + if (pd->type == OPT_OFFSET) { + for (j = 0; j < pd->count; j++) + free(pd->d[j].u.label); + } + free(pd->d); + pd->d = NULL; + } + g_func_pd_cnt = 0; + pd = NULL; + if (wordc == 0) + continue; + } + if (IS(words[1], "proc")) { if (in_func) aerr("proc '%s' while in_func '%s'?\n", words[0], g_func); p = words[0]; - if ((ida_func_attr & IDAFA_THUNK) + if ((g_ida_func_attr & IDAFA_THUNK) || bsearch(&p, rlist, rlist_len, sizeof(rlist[0]), cmpstringp)) skip_func = 1; strcpy(g_func, words[0]); @@ -2803,31 +4136,48 @@ parse_words: continue; } - if (IS(words[1], "endp")) { + if (IS(words[1], "endp")) + { if (!in_func) aerr("endp '%s' while not in_func?\n", words[0]); if (!IS(g_func, words[0])) aerr("endp '%s' while in_func '%s'?\n", words[0], g_func); - if (in_func && !skip_func) - gen_func(fout, g_fhdr, g_func, pi); + if (!skip_func && func_chunks_used) { + // start processing chunks + struct chunk_item *ci, key = { g_func, 0 }; - in_func = 0; - skip_warned = 0; - skip_func = 0; - g_func[0] = 0; - if (pi != 0) { - memset(&ops, 0, pi * sizeof(ops[0])); - memset(g_labels, 0, pi * sizeof(g_labels[0])); - memset(g_label_refs, 0, pi * sizeof(g_label_refs[0])); - pi = 0; + func_chunk_ret = ftell(fasm); + func_chunk_ret_ln = asmln; + if (!func_chunks_sorted) { + qsort(func_chunks, func_chunk_cnt, + sizeof(func_chunks[0]), cmp_chunks); + func_chunks_sorted = 1; + } + ci = bsearch(&key, func_chunks, func_chunk_cnt, + sizeof(func_chunks[0]), cmp_chunks); + if (ci == NULL) + aerr("'%s' needs chunks, but none found\n", g_func); + func_chunk_i = ci - func_chunks; + for (; func_chunk_i > 0; func_chunk_i--) + if (!IS(func_chunks[func_chunk_i - 1].name, g_func)) + break; + + ret = fseek(fasm, func_chunks[func_chunk_i].fptr, SEEK_SET); + if (ret) + aerr("seek failed for '%s' chunk #%d\n", g_func, func_chunk_i); + asmln = func_chunks[func_chunk_i].asmln; + func_chunk_i++; + continue; } - g_eqcnt = 0; - ida_func_attr = 0; + pending_endp = 1; continue; } + if (wordc == 2 && IS(words[1], "ends")) + break; + p = strchr(words[0], ':'); if (p != NULL) { set_label(pi, words[0]); @@ -2844,7 +4194,7 @@ parse_words: continue; } - if (IS(words[1], "=")) { + if (wordc > 1 && IS(words[1], "=")) { if (wordc != 5) aerr("unhandled equ, wc=%d\n", wordc); if (g_eqcnt >= eq_alloc) {