From: notaz Date: Sun, 8 Dec 2013 22:35:01 +0000 (+0200) Subject: handle indirect __cdecl calls, esp stackframes; fixes X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1bafb621d8dcb57a672b41258de0a8d36b3a4821;p=ia32rtools.git handle indirect __cdecl calls, esp stackframes; fixes --- diff --git a/tools/translate.c b/tools/translate.c index efb0974..fbc8ff6 100644 --- a/tools/translate.c +++ b/tools/translate.c @@ -141,7 +141,16 @@ struct parsed_equ { int offset; }; -#define MAX_OPS 1024 +enum ida_func_attr { + IDAFA_BP_FRAME = (1 << 0), + IDAFA_LIB_FUNC = (1 << 1), + IDAFA_STATIC = (1 << 2), + IDAFA_NORETURN = (1 << 3), + IDAFA_THUNK = (1 << 4), + IDAFA_FPD = (1 << 5), +}; + +#define MAX_OPS 4096 static struct parsed_op ops[MAX_OPS]; static struct parsed_equ *g_eqs; @@ -152,7 +161,8 @@ static struct parsed_proto g_func_pp; static char g_func[256]; static char g_comment[256]; static int g_bp_frame; -static int g_bp_stack; +static int g_sp_frame; +static int g_stack_fsz; #define ferr(op_, fmt, ...) do { \ printf("error:%s:#%ld: '%s': " fmt, g_func, (op_) - ops, \ dump_op(op_), ##__VA_ARGS__); \ @@ -318,8 +328,10 @@ pass: static const char *parse_stack_el(const char *name) { - const char *p; + const char *p, *s; + char *endp = NULL; char buf[32]; + long val; int len; if (!strncmp(name, "ebp+", 4) @@ -332,14 +344,23 @@ static const char *parse_stack_el(const char *name) p = strchr(name + 4, '+'); if (p) { - // must be a number after esp+ - if (!('0' <= name[4] && name[4] <= '9')) + // must be a number after esp+, already converted to 0x.. + s = name + 4; + if (!('0' <= *s && *s <= '9')) { + aerr("%s nan?\n", __func__); return NULL; - len = p - (name + 4); + } + if (s[0] == '0' && s[1] == 'x') + s += 2; + len = p - s; if (len < sizeof(buf) - 1) { - strncpy(buf, name + 4, len); + strncpy(buf, s, len); buf[len] = 0; - parse_number(buf); + val = strtol(buf, &endp, 16); + if (val == 0 || *endp != 0) { + aerr("%s num parse fail for '%s'\n", __func__, buf); + return NULL; + } } p++; } @@ -382,65 +403,74 @@ static struct parsed_equ *equ_find(struct parsed_op *po, const char *name); 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) + char words[16][256], int wordc, int w, unsigned int op_flags) { enum opr_lenmod tmplmod; int ret, len; long number; + int wordc_in; int i; - if (w >= wordc) - aerr("parse_operand w %d, wordc %d\n", w, wordc); + if (w >= wordc) + aerr("parse_operand w %d, wordc %d\n", w, wordc); - opr->reg = xUNSPEC; + opr->reg = xUNSPEC; - for (i = w; i < wordc; i++) { - len = strlen(words[i]); - if (words[i][len - 1] == ',') { - words[i][len - 1] = 0; - wordc = i + 1; - break; - } - } + for (i = w; i < wordc; i++) { + len = strlen(words[i]); + if (words[i][len - 1] == ',') { + words[i][len - 1] = 0; + wordc = i + 1; + break; + } + } - if (op_flags & OPF_JMP) { - const char *label; - - if (wordc - w == 3 && IS(words[w + 1], "ptr")) - label = words[w + 2]; - else if (wordc - w == 2 && IS(words[w], "short")) - label = words[w + 1]; - else if (wordc - w == 1) - label = words[w]; - else - aerr("jump parse error"); - - opr->type = OPT_LABEL; - strcpy(opr->name, label); - return wordc; - } + wordc_in = wordc - w; - if (wordc - w >= 3) { - if (IS(words[w + 1], "ptr")) { - if (IS(words[w], "dword")) - opr->lmod = OPLM_DWORD; - else if (IS(words[w], "word")) - opr->lmod = OPLM_WORD; - else if (IS(words[w], "byte")) - opr->lmod = OPLM_BYTE; - else - aerr("type parsing failed\n"); - w += 2; - } - } + if ((op_flags & OPF_JMP) && wordc_in > 0 + && !('0' <= words[w][0] && words[w][0] <= '9')) + { + const char *label = NULL; + + if (wordc_in == 3 && !strncmp(words[w], "near", 4) + && IS(words[w + 1], "ptr")) + label = words[w + 2]; + else if (wordc_in == 2 && IS(words[w], "short")) + label = words[w + 1]; + else if (wordc_in == 1 + && strchr(words[w], '[') == NULL + && parse_reg(&tmplmod, words[w]) < 0) + label = words[w]; + + if (label != NULL) { + opr->type = OPT_LABEL; + strcpy(opr->name, label); + return wordc; + } + } - if (wordc - w == 2 && IS(words[w], "offset")) { - opr->type = OPT_OFFSET; - strcpy(opr->name, words[w + 1]); - return wordc; - } + if (wordc_in >= 3) { + if (IS(words[w + 1], "ptr")) { + if (IS(words[w], "dword")) + opr->lmod = OPLM_DWORD; + else if (IS(words[w], "word")) + opr->lmod = OPLM_WORD; + else if (IS(words[w], "byte")) + opr->lmod = OPLM_BYTE; + else + aerr("type parsing failed\n"); + w += 2; + wordc_in = wordc - w; + } + } + + if (wordc_in == 2 && IS(words[w], "offset")) { + opr->type = OPT_OFFSET; + strcpy(opr->name, words[w + 1]); + return wordc; + } - if (wordc - w != 1) + if (wordc_in != 1) aerr("parse_operand 1 word expected\n"); strcpy(opr->name, words[w]); @@ -891,9 +921,9 @@ static struct parsed_equ *equ_find(struct parsed_op *po, const char *name) return &g_eqs[i]; } -static void bg_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) +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) { const char *prefix = ""; struct parsed_equ *eq; @@ -917,7 +947,8 @@ static void bg_frame_access(struct parsed_op *po, enum opr_lenmod lmod, if (eq->offset > stack_ra) { arg_i = (eq->offset - stack_ra - 4) / 4; if (arg_i < 0 || arg_i >= g_func_pp.argc_stack) - ferr(po, "offset %d doesn't map to any arg\n", eq->offset); + ferr(po, "offset %d (%s) doesn't map to any arg\n", + eq->offset, bp_arg); for (i = arg_s = 0; i < g_func_pp.argc; i++) { if (g_func_pp.arg[i].reg != NULL) @@ -934,12 +965,12 @@ static void bg_frame_access(struct parsed_op *po, enum opr_lenmod lmod, snprintf(buf, buf_size, "%sa%d", is_src ? "(u32)" : "", i + 1); } else { - if (g_bp_stack == 0) - ferr(po, "bp_stack access after it was not detected\n"); + if (g_stack_fsz == 0) + ferr(po, "stack var access without stackframe\n"); - sf_ofs = g_bp_stack + eq->offset; + sf_ofs = g_stack_fsz + eq->offset; if (sf_ofs < 0) - ferr(po, "bp_stack offset %d/%d\n", eq->offset, g_bp_stack); + ferr(po, "bp_stack offset %d/%d\n", eq->offset, g_stack_fsz); if (is_lea) prefix = "(u32)&"; @@ -993,7 +1024,7 @@ static char *out_src_opr(char *buf, size_t buf_size, case OPT_REGMEM: if (parse_stack_el(popr->name)) { - bg_frame_access(po, popr->lmod, buf, buf_size, + stack_frame_access(po, popr->lmod, buf, buf_size, popr->name, 1, is_lea); break; } @@ -1071,7 +1102,7 @@ static char *out_dst_opr(char *buf, size_t buf_size, case OPT_REGMEM: if (parse_stack_el(popr->name)) { - bg_frame_access(po, popr->lmod, buf, buf_size, + stack_frame_access(po, popr->lmod, buf, buf_size, popr->name, 0, 0); break; } @@ -1322,7 +1353,8 @@ static int scan_for_pop(int i, int opcnt, const char *reg, if (po->flags & OPF_TAIL) return -1; // deadend - if (po->flags & OPF_RMD) + if ((po->flags & OPF_RMD) + || (po->op == OP_PUSH && po->argmask)) // arg push continue; if ((po->flags & OPF_JMP) && po->op != OP_CALL) { @@ -1495,6 +1527,29 @@ static int scan_for_cdq_edx(int i) return -1; } +// scan for positive, constant esp adjust +static int scan_for_esp_adjust(int i, int opcnt, int *adj) +{ + for (; i < opcnt; i++) { + if (ops[i].op == OP_ADD && ops[i].operand[0].reg == xSP) { + if (ops[i].operand[1].type != OPT_CONST) + ferr(&ops[i], "non-const esp adjust?\n"); + *adj = ops[i].operand[1].val; + if (*adj & 3) + ferr(&ops[i], "unaligned esp adjust: %x\n", *adj); + return i; + } + + 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; + } + + return -1; +} + static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) { struct parsed_op *po, *delayed_flag_op = NULL, *tmp_op; @@ -1519,7 +1574,7 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) int reg; int ret; - g_bp_frame = g_bp_stack = 0; + g_bp_frame = g_sp_frame = g_stack_fsz = 0; ret = proto_parse(fhdr, funcn, &g_func_pp); if (ret) @@ -1534,7 +1589,7 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) fprintf(fout, ")\n{\n"); // pass1: - // - handle ebp frame, remove ops related to it + // - handle ebp/esp frame, remove ops related to it if (ops[0].op == OP_PUSH && IS(opr_name(&ops[0], 0), "ebp") && ops[1].op == OP_MOV && IS(opr_name(&ops[1], 0), "ebp") @@ -1547,14 +1602,14 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) ops[1].flags |= OPF_RMD; if (ops[2].op == OP_SUB && IS(opr_name(&ops[2], 0), "esp")) { - g_bp_stack = opr_const(&ops[2], 1); + g_stack_fsz = opr_const(&ops[2], 1); ops[2].flags |= OPF_RMD; } else { // another way msvc builds stack frame.. i = 2; while (ops[i].op == OP_PUSH && IS(opr_name(&ops[i], 0), "ecx")) { - g_bp_stack += 4; + g_stack_fsz += 4; ops[i].flags |= OPF_RMD; ecx_push++; i++; @@ -1570,7 +1625,7 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) ferr(&ops[i - 1], "'pop ebp' expected\n"); ops[i - 1].flags |= OPF_RMD; - if (g_bp_stack != 0) { + 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")) @@ -1589,6 +1644,39 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) i++; } while (i < opcnt); } + else { + for (i = 0; i < opcnt; i++) { + if (ops[i].op == OP_PUSH || (ops[i].flags & (OPF_JMP|OPF_TAIL))) + break; + if (ops[i].op == OP_SUB && ops[i].operand[0].reg == xSP + && ops[i].operand[1].type == OPT_CONST) + { + g_sp_frame = 1; + break; + } + } + + if (g_sp_frame) + { + g_stack_fsz = ops[i].operand[1].val; + ops[i].flags |= OPF_RMD; + + i++; + do { + for (; i < opcnt; i++) + if (ops[i].op == OP_RET) + break; + if (ops[i - 1].op != OP_ADD + || !IS(opr_name(&ops[i - 1], 0), "esp") + || ops[i - 1].operand[1].type != OPT_CONST + || ops[i - 1].operand[1].val != g_stack_fsz) + ferr(&ops[i - 1], "'add esp' expected\n"); + ops[i - 1].flags |= OPF_RMD; + + i++; + } while (i < opcnt); + } + } // pass2: // - resolve all branches @@ -1618,26 +1706,68 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) // pass3: // - process calls - for (i = 0; i < opcnt; i++) { + for (i = 0; i < opcnt; i++) + { po = &ops[i]; if (po->flags & OPF_RMD) continue; if (po->op == OP_CALL) { - pp = malloc(sizeof(*pp)); + pp = calloc(1, sizeof(*pp)); my_assert_not(pp, NULL); - tmpname = opr_name(&ops[i], 0); - ret = proto_parse(fhdr, tmpname, pp); - if (ret) - ferr(po, "proto_parse failed for '%s'\n", tmpname); + tmpname = opr_name(po, 0); + if (po->operand[0].type != OPT_LABEL) + { + 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->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); + } + + ret = scan_for_esp_adjust(i + 1, opcnt, &j); + if (ret >= 0) { + if (pp->argc_stack != j / 4) + ferr(po, "stack tracking failed: %x %x\n", + pp->argc_stack, j); + ops[ret].flags |= OPF_RMD; + } for (arg = 0; arg < pp->argc; arg++) if (pp->arg[arg].reg == NULL) break; - for (j = i - 1; j >= 0 && arg < pp->argc; j--) { - if (ops[j].op == OP_CALL) { + 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"); @@ -1650,12 +1780,13 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) { break; } - - if (ops[j].op == OP_PUSH) { + 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; } @@ -1667,21 +1798,6 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) if (pp->arg[arg].reg == NULL) break; } - - 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; - } } if (arg < pp->argc) ferr(po, "arg collect failed for '%s'\n", tmpname); @@ -1693,6 +1809,7 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) // - find POPs for PUSHes, rm both // - scan for all used registers // - find flag set ops for their users + // - declare indirect functions for (i = 0; i < opcnt; i++) { po = &ops[i]; if (po->flags & OPF_RMD) @@ -1772,12 +1889,23 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) { need_mul_var = 1; } + 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); + 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, ");\n"); + } } // declare stack frame - if (g_bp_stack) + if (g_stack_fsz) fprintf(fout, " union { u32 d[%d]; u16 w[%d]; u8 b[%d]; } sf;\n", - (g_bp_stack + 3) / 4, (g_bp_stack + 1) / 2, g_bp_stack); + (g_stack_fsz + 3) / 4, (g_stack_fsz + 1) / 2, g_stack_fsz); // declare arg-registers for (i = 0; i < g_func_pp.argc; i++) { @@ -2091,8 +2219,14 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) case OP_INC: case OP_DEC: out_dst_opr(buf1, sizeof(buf1), po, &po->operand[0]); - strcpy(buf2, po->op == OP_INC ? "++" : "--"); - fprintf(fout, " %s%s;", buf1, buf2); + if (po->operand[0].type == OPT_REG) { + strcpy(buf2, po->op == OP_INC ? "++" : "--"); + fprintf(fout, " %s%s;", buf1, buf2); + } + else { + strcpy(buf2, po->op == OP_INC ? "+" : "-"); + fprintf(fout, " %s %s= 1;", buf1, buf2); + } last_arith_dst = &po->operand[0]; delayed_flag_op = NULL; break; @@ -2182,13 +2316,14 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) case OP_CALL: assert_operand_cnt(1); - if (po->operand[0].type != OPT_LABEL) - ferr(po, "unhandled call type\n"); - pp = po->datap; if (pp == NULL) ferr(po, "NULL pp\n"); + 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)); + fprintf(fout, " "); if (!IS(pp->ret_type, "void")) { if (po->flags & OPF_TAIL) @@ -2199,7 +2334,10 @@ static void gen_func(FILE *fout, FILE *fhdr, const char *funcn, int opcnt) fprintf(fout, "(u32)"); } - fprintf(fout, "%s(", opr_name(po, 0)); + if (po->operand[0].type != OPT_LABEL) + fprintf(fout, "icall%d(", i); + else + fprintf(fout, "%s(", opr_name(po, 0)); for (arg = 0; arg < pp->argc; arg++) { if (arg > 0) fprintf(fout, ", "); @@ -2369,6 +2507,7 @@ int main(int argc, char *argv[]) FILE *fout, *fasm, *fhdr, *frlist; char line[256]; char words[16][256]; + int ida_func_attr = 0; int in_func = 0; int skip_func = 0; int skip_warned = 0; @@ -2380,7 +2519,7 @@ int main(int argc, char *argv[]) int arg_out; int arg = 1; int pi = 0; - int len; + int i, len; char *p; int wordc; @@ -2451,9 +2590,49 @@ int main(int argc, char *argv[]) asmln++; p = sskip(line); - if (*p == 0 || *p == ';') + 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; + + // 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]); + 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.. + } + } + continue; + } + memset(words, 0, sizeof(words)); for (wordc = 0; wordc < 16; wordc++) { p = sskip(next_word_s(words[wordc], sizeof(words[0]), p)); @@ -2483,7 +2662,8 @@ int main(int argc, char *argv[]) aerr("proc '%s' while in_func '%s'?\n", words[0], g_func); p = words[0]; - if (bsearch(&p, rlist, rlist_len, sizeof(rlist[0]), cmpstringp)) + if ((ida_func_attr & IDAFA_THUNK) + || bsearch(&p, rlist, rlist_len, sizeof(rlist[0]), cmpstringp)) skip_func = 1; strcpy(g_func, words[0]); set_label(0, words[0]); @@ -2512,6 +2692,7 @@ int main(int argc, char *argv[]) pi = 0; } g_eqcnt = 0; + ida_func_attr = 0; continue; }