static int pe_check_symbols(struct pe_info *pe) {
Elf32_Sym *sym;
int sym_index, sym_end;
int ret = 0;
pe_align_section(text_section, 8);
sym_end = symtab_section->data_offset / sizeof(Elf32_Sym);
for (sym_index = 1; sym_index < sym_end; ++sym_index) {
sym = (Elf32_Sym *) symtab_section->data + sym_index;
if (sym->st_shndx == SHN_UNDEF) {
const char *name = symtab_section->link->data + sym->st_name;
unsigned type = ELF32_ST_TYPE(sym->st_info);
int imp_sym = pe_find_import(pe->s1, name);
struct import_symbol *is;
if (imp_sym == 0) goto not_found;
is = pe_add_import(pe, imp_sym);
if (!is) goto not_found;
if (type == STT_FUNC) {
unsigned long offset = is->thk_offset;
if (offset) {
// Got aliased symbol, like stricmp and _stricmp
} else {
char buffer[100];
offset = text_section->data_offset;
// Add the 'jmp IAT[x]' instruction
*(WORD *) section_ptr_add(text_section, 8) = 0x25FF;
// Add a helper symbol, will be patched later in pe_build_imports
sprintf(buffer, "IAT.%s", name);
is->iat_index = put_elf_sym(symtab_section, 0, sizeof(DWORD),
ELF32_ST_INFO(STB_GLOBAL, STT_OBJECT),
0, SHN_UNDEF, buffer);
put_elf_reloc(symtab_section, text_section, offset + 2, R_386_32, is->iat_index);
is->thk_offset = offset;
}
// tcc_realloc might have altered sym's address
sym = (Elf32_Sym *) symtab_section->data + sym_index;
// Patch the original symbol
sym->st_value = offset;
sym->st_shndx = text_section->sh_num;
sym->st_other &= ~1; // Do not export
continue;
}
if (type == STT_OBJECT) {
if (is->iat_index == 0) {
// Original symbol will be patched later in pe_build_imports
is->iat_index = sym_index;
continue;
}
}
not_found:
error_noabort("undefined symbol '%s'", name);
ret = 1;
} else if (pe->s1->rdynamic && ELF32_ST_BIND(sym->st_info) != STB_LOCAL) {
// If -rdynamic option, then export all non local symbols
sym->st_other |= 1;
}
}
return ret;
}
static void pe_build_imports(struct pe_info *pe) {
int thk_ptr, ent_ptr, dll_ptr, sym_cnt, i;
DWORD rva_base = pe->thunk->sh_addr - pe->imagebase;
int ndlls = pe->imp_count;
for (sym_cnt = i = 0; i < ndlls; ++i) {
sym_cnt += pe->imp_info[i]->sym_count;
}
if (sym_cnt == 0) return;
pe_align_section(pe->thunk, 16);
pe->imp_offs = dll_ptr = pe->thunk->data_offset;
pe->imp_size = (ndlls + 1) * sizeof(struct pe_import_header);
pe->iat_offs = dll_ptr + pe->imp_size;
pe->iat_size = (sym_cnt + ndlls) * sizeof(DWORD);
section_ptr_add(pe->thunk, pe->imp_size + 2 * pe->iat_size);
thk_ptr = pe->iat_offs;
ent_ptr = pe->iat_offs + pe->iat_size;
for (i = 0; i < pe->imp_count; ++i) {
struct pe_import_header *hdr;
int k, n, v;
struct pe_import_info *p = pe->imp_info[i];
const char *name = pe->s1->loaded_dlls[p->dll_index - 1]->name;
// Put the DLL name into the import header
v = put_elf_str(pe->thunk, name);
hdr = (struct pe_import_header *) (pe->thunk->data + dll_ptr);
hdr->first_thunk = thk_ptr + rva_base;
hdr->first_entry = ent_ptr + rva_base;
hdr->lib_name_offset = v + rva_base;
for (k = 0, n = p->sym_count; k <= n; ++k) {
if (k < n) {
DWORD iat_index = p->symbols[k]->iat_index;
int sym_index = p->symbols[k]->sym_index;
Elf32_Sym *imp_sym = (Elf32_Sym *) pe->s1->dynsymtab_section->data + sym_index;
Elf32_Sym *org_sym = (Elf32_Sym *) symtab_section->data + iat_index;
const char *name = pe->s1->dynsymtab_section->link->data + imp_sym->st_name;
org_sym->st_value = thk_ptr;
org_sym->st_shndx = pe->thunk->sh_num;
v = pe->thunk->data_offset + rva_base;
*(WORD *) section_ptr_add(pe->thunk, sizeof(WORD)) = imp_sym->st_other; // Hint
put_elf_str(pe->thunk, name);
} else {
v = 0; // Last entry is zero
}
*(DWORD *)(pe->thunk->data + thk_ptr) = v;
*(DWORD *)(pe->thunk->data + ent_ptr) = v;
thk_ptr += sizeof(DWORD);
ent_ptr += sizeof(DWORD);
}
dll_ptr += sizeof(struct pe_import_header);
dynarray_reset(&p->symbols, &p->sym_count);
}
dynarray_reset(&pe->imp_info, &pe->imp_count);
}
static void pe_build_exports(struct pe_info *pe) {
Elf32_Sym *sym;
int sym_index, sym_end;
DWORD rva_base, func_o, name_o, ord_o, str_o;
struct pe_export_header *hdr;
int sym_count, n, ord, *sorted, *sp;
FILE *op;
char buf[260];
const char *dllname;
const char *name;
rva_base = pe->thunk->sh_addr - pe->imagebase;
sym_count = 0;
n = 1;
sorted = NULL;
op = NULL;
sym_end = symtab_section->data_offset / sizeof(Elf32_Sym);
for (sym_index = 1; sym_index < sym_end; ++sym_index) {
sym = (Elf32_Sym *) symtab_section->data + sym_index;
name = symtab_section->link->data + sym->st_name;
// Only export symbols from actually written sections
if ((sym->st_other & 1) && pe->s1->sections[sym->st_shndx]->sh_addr) {
dynarray_add((void ***) &sorted, &sym_count, (void *) n);
dynarray_add((void ***) &sorted, &sym_count, (void *) name);
}
++n;
}
if (sym_count == 0) return;
sym_count /= 2;
qsort(sorted, sym_count, 2 * sizeof(sorted[0]), sym_cmp);
pe_align_section(pe->thunk, 16);
dllname = tcc_basename(pe->filename);
pe->exp_offs = pe->thunk->data_offset;
func_o = pe->exp_offs + sizeof(struct pe_export_header);
name_o = func_o + sym_count * sizeof(DWORD);
ord_o = name_o + sym_count * sizeof(DWORD);
str_o = ord_o + sym_count * sizeof(WORD);
hdr = section_ptr_add(pe->thunk, str_o - pe->exp_offs);
hdr->Characteristics = 0;
hdr->Base = 1;
hdr->NumberOfFunctions = sym_count;
hdr->NumberOfNames = sym_count;
hdr->AddressOfFunctions = func_o + rva_base;
hdr->AddressOfNames = name_o + rva_base;
hdr->AddressOfNameOrdinals = ord_o + rva_base;
hdr->Name = str_o + rva_base;
put_elf_str(pe->thunk, dllname);
if (pe->def != NULL) {
// Write exports to .def file
op = fopen(pe->def, "w");
if (op == NULL) {
error_noabort("could not create '%s': %s", pe->def, strerror(errno));
} else {
fprintf(op, "LIBRARY %s\n\nEXPORTS\n", dllname);
if (verbose) {
printf("<- %s (%d symbols)\n", buf, sym_count);
}
}
}
for (sp = sorted, ord = 0; ord < sym_count; ++ord, sp += 2) {
sym_index = sp[0];
name = (const char *) sp[1];
// Insert actual address later in pe_relocate_rva
put_elf_reloc(symtab_section, pe->thunk, func_o, R_386_RELATIVE, sym_index);
*(DWORD *)(pe->thunk->data + name_o) = pe->thunk->data_offset + rva_base;
*(WORD *)(pe->thunk->data + ord_o) = ord;
put_elf_str(pe->thunk, name);
func_o += sizeof(DWORD);
name_o += sizeof(DWORD);
ord_o += sizeof(WORD);
if (op) fprintf(op, "%s@%d\n", name, ord);
}
pe->exp_size = pe->thunk->data_offset - pe->exp_offs;
tcc_free(sorted);
if (op) fclose(op);
}
ST_FN void pe_build_exports(struct pe_info *pe)
{
Elf32_Sym *sym;
int sym_index, sym_end;
DWORD rva_base, func_o, name_o, ord_o, str_o;
struct pe_export_header *hdr;
int sym_count, n, ord, *sorted, *sp;
FILE *op;
char buf[MAX_PATH];
const char *dllname;
const char *name;
rva_base = pe->thunk->sh_addr - pe->imagebase;
sym_count = 0, n = 1, sorted = NULL, op = NULL;
sym_end = symtab_section->data_offset / sizeof(Elf32_Sym);
for (sym_index = 1; sym_index < sym_end; ++sym_index) {
sym = (Elf32_Sym*)symtab_section->data + sym_index;
name = symtab_section->link->data + sym->st_name;
if ((sym->st_other & 1)
/* export only symbols from actually written sections */
&& pe->s1->sections[sym->st_shndx]->sh_addr) {
dynarray_add((void***)&sorted, &sym_count, (void*)n);
dynarray_add((void***)&sorted, &sym_count, (void*)name);
}
++n;
#if 0
if (sym->st_other & 1)
printf("export: %s\n", name);
if (sym->st_other & 2)
printf("stdcall: %s\n", name);
#endif
}
if (0 == sym_count)
return;
sym_count /= 2;
qsort (sorted, sym_count, 2 * sizeof sorted[0], sym_cmp);
pe_align_section(pe->thunk, 16);
dllname = tcc_basename(pe->filename);
pe->exp_offs = pe->thunk->data_offset;
func_o = pe->exp_offs + sizeof(struct pe_export_header);
name_o = func_o + sym_count * sizeof (DWORD);
ord_o = name_o + sym_count * sizeof (DWORD);
str_o = ord_o + sym_count * sizeof(WORD);
hdr = section_ptr_add(pe->thunk, str_o - pe->exp_offs);
hdr->Characteristics = 0;
hdr->Base = 1;
hdr->NumberOfFunctions = sym_count;
hdr->NumberOfNames = sym_count;
hdr->AddressOfFunctions = func_o + rva_base;
hdr->AddressOfNames = name_o + rva_base;
hdr->AddressOfNameOrdinals = ord_o + rva_base;
hdr->Name = str_o + rva_base;
put_elf_str(pe->thunk, dllname);
#if 1
/* automatically write exports to <output-filename>.def */
strcpy(buf, pe->filename);
strcpy(tcc_fileextension(buf), ".def");
op = fopen(buf, "w");
if (NULL == op) {
error_noabort("could not create '%s': %s", buf, strerror(errno));
} else {
fprintf(op, "LIBRARY %s\n\nEXPORTS\n", dllname);
if (pe->s1->verbose)
printf("<- %s (%d symbols)\n", buf, sym_count);
}
#endif
for (sp = sorted, ord = 0; ord < sym_count; ++ord, sp += 2)
{
sym_index = sp[0], name = (const char *)sp[1];
/* insert actual address later in pe_relocate_rva */
put_elf_reloc(symtab_section, pe->thunk,
func_o, R_386_RELATIVE, sym_index);
*(DWORD*)(pe->thunk->data + name_o)
= pe->thunk->data_offset + rva_base;
*(WORD*)(pe->thunk->data + ord_o)
= ord;
put_elf_str(pe->thunk, name);
func_o += sizeof (DWORD);
name_o += sizeof (DWORD);
ord_o += sizeof (WORD);
if (op)
fprintf(op, "%s\n", name);
}
pe->exp_size = pe->thunk->data_offset - pe->exp_offs;
tcc_free(sorted);
}
