diff options
Diffstat (limited to 'tinyc/tccelf.c')
| -rwxr-xr-x | tinyc/tccelf.c | 2732 |
1 files changed, 0 insertions, 2732 deletions
diff --git a/tinyc/tccelf.c b/tinyc/tccelf.c deleted file mode 100755 index 4020e249c..000000000 --- a/tinyc/tccelf.c +++ /dev/null @@ -1,2732 +0,0 @@ -/* - * ELF file handling for TCC - * - * Copyright (c) 2001-2004 Fabrice Bellard - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#ifdef TCC_TARGET_X86_64 -#define ElfW_Rel ElfW(Rela) -#define SHT_RELX SHT_RELA -#define REL_SECTION_FMT ".rela%s" -/* x86-64 requires PLT for DLLs */ -#define TCC_OUTPUT_DLL_WITH_PLT -#else -#define ElfW_Rel ElfW(Rel) -#define SHT_RELX SHT_REL -#define REL_SECTION_FMT ".rel%s" -#endif - -/* XXX: DLL with PLT would only work with x86-64 for now */ -//#define TCC_OUTPUT_DLL_WITH_PLT - -static int put_elf_str(Section *s, const char *sym) -{ - int offset, len; - char *ptr; - - len = strlen(sym) + 1; - offset = s->data_offset; - ptr = section_ptr_add(s, len); - memcpy(ptr, sym, len); - return offset; -} - -/* elf symbol hashing function */ -static unsigned long elf_hash(const unsigned char *name) -{ - unsigned long h = 0, g; - - while (*name) { - h = (h << 4) + *name++; - g = h & 0xf0000000; - if (g) - h ^= g >> 24; - h &= ~g; - } - return h; -} - -/* rebuild hash table of section s */ -/* NOTE: we do factorize the hash table code to go faster */ -static void rebuild_hash(Section *s, unsigned int nb_buckets) -{ - ElfW(Sym) *sym; - int *ptr, *hash, nb_syms, sym_index, h; - char *strtab; - - strtab = s->link->data; - nb_syms = s->data_offset / sizeof(ElfW(Sym)); - - s->hash->data_offset = 0; - ptr = section_ptr_add(s->hash, (2 + nb_buckets + nb_syms) * sizeof(int)); - ptr[0] = nb_buckets; - ptr[1] = nb_syms; - ptr += 2; - hash = ptr; - memset(hash, 0, (nb_buckets + 1) * sizeof(int)); - ptr += nb_buckets + 1; - - sym = (ElfW(Sym) *)s->data + 1; - for(sym_index = 1; sym_index < nb_syms; sym_index++) { - if (ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) { - h = elf_hash(strtab + sym->st_name) % nb_buckets; - *ptr = hash[h]; - hash[h] = sym_index; - } else { - *ptr = 0; - } - ptr++; - sym++; - } -} - -/* return the symbol number */ -static int put_elf_sym(Section *s, - unsigned long value, unsigned long size, - int info, int other, int shndx, const char *name) -{ - int name_offset, sym_index; - int nbuckets, h; - ElfW(Sym) *sym; - Section *hs; - - sym = section_ptr_add(s, sizeof(ElfW(Sym))); - if (name) - name_offset = put_elf_str(s->link, name); - else - name_offset = 0; - /* XXX: endianness */ - sym->st_name = name_offset; - sym->st_value = value; - sym->st_size = size; - sym->st_info = info; - sym->st_other = other; - sym->st_shndx = shndx; - sym_index = sym - (ElfW(Sym) *)s->data; - hs = s->hash; - if (hs) { - int *ptr, *base; - ptr = section_ptr_add(hs, sizeof(int)); - base = (int *)hs->data; - /* only add global or weak symbols */ - if (ELFW(ST_BIND)(info) != STB_LOCAL) { - /* add another hashing entry */ - nbuckets = base[0]; - h = elf_hash(name) % nbuckets; - *ptr = base[2 + h]; - base[2 + h] = sym_index; - base[1]++; - /* we resize the hash table */ - hs->nb_hashed_syms++; - if (hs->nb_hashed_syms > 2 * nbuckets) { - rebuild_hash(s, 2 * nbuckets); - } - } else { - *ptr = 0; - base[1]++; - } - } - return sym_index; -} - -/* find global ELF symbol 'name' and return its index. Return 0 if not - found. */ -static int find_elf_sym(Section *s, const char *name) -{ - ElfW(Sym) *sym; - Section *hs; - int nbuckets, sym_index, h; - const char *name1; - - hs = s->hash; - if (!hs) - return 0; - nbuckets = ((int *)hs->data)[0]; - h = elf_hash(name) % nbuckets; - sym_index = ((int *)hs->data)[2 + h]; - while (sym_index != 0) { - sym = &((ElfW(Sym) *)s->data)[sym_index]; - name1 = s->link->data + sym->st_name; - if (!strcmp(name, name1)) - return sym_index; - sym_index = ((int *)hs->data)[2 + nbuckets + sym_index]; - } - return 0; -} - -/* return elf symbol value or error */ -void *tcc_get_symbol(TCCState *s, const char *name) -{ - int sym_index; - ElfW(Sym) *sym; - sym_index = find_elf_sym(symtab_section, name); - if (!sym_index) - return NULL; - sym = &((ElfW(Sym) *)symtab_section->data)[sym_index]; - return (void*)(long)sym->st_value; -} - -void *tcc_get_symbol_err(TCCState *s, const char *name) -{ - void *sym; - sym = tcc_get_symbol(s, name); - if (!sym) - error("%s not defined", name); - return sym; -} - -/* add an elf symbol : check if it is already defined and patch - it. Return symbol index. NOTE that sh_num can be SHN_UNDEF. */ -static int add_elf_sym(Section *s, unsigned long value, unsigned long size, - int info, int other, int sh_num, const char *name) -{ - ElfW(Sym) *esym; - int sym_bind, sym_index, sym_type, esym_bind; - unsigned char sym_vis, esym_vis, new_vis; - - sym_bind = ELFW(ST_BIND)(info); - sym_type = ELFW(ST_TYPE)(info); - sym_vis = ELFW(ST_VISIBILITY)(other); - - if (sym_bind != STB_LOCAL) { - /* we search global or weak symbols */ - sym_index = find_elf_sym(s, name); - if (!sym_index) - goto do_def; - esym = &((ElfW(Sym) *)s->data)[sym_index]; - if (esym->st_shndx != SHN_UNDEF) { - esym_bind = ELFW(ST_BIND)(esym->st_info); - /* propagate the most constraining visibility */ - /* STV_DEFAULT(0)<STV_PROTECTED(3)<STV_HIDDEN(2)<STV_INTERNAL(1) */ - esym_vis = ELFW(ST_VISIBILITY)(esym->st_other); - if (esym_vis == STV_DEFAULT) { - new_vis = sym_vis; - } else if (sym_vis == STV_DEFAULT) { - new_vis = esym_vis; - } else { - new_vis = (esym_vis < sym_vis) ? esym_vis : sym_vis; - } - esym->st_other = (esym->st_other & ~ELFW(ST_VISIBILITY)(-1)) - | new_vis; - other = esym->st_other; /* in case we have to patch esym */ - if (sh_num == SHN_UNDEF) { - /* ignore adding of undefined symbol if the - corresponding symbol is already defined */ - } else if (sym_bind == STB_GLOBAL && esym_bind == STB_WEAK) { - /* global overrides weak, so patch */ - goto do_patch; - } else if (sym_bind == STB_WEAK && esym_bind == STB_GLOBAL) { - /* weak is ignored if already global */ - } else if (sym_vis == STV_HIDDEN || sym_vis == STV_INTERNAL) { - /* ignore hidden symbols after */ - } else if (esym->st_shndx == SHN_COMMON && sh_num < SHN_LORESERVE) { - /* gr: Happens with 'tcc ... -static tcctest.c' on e.g. Ubuntu 6.01 - No idea if this is the correct solution ... */ - goto do_patch; - } else if (s == tcc_state->dynsymtab_section) { - /* we accept that two DLL define the same symbol */ - } else { -#if 1 - printf("new_bind=%x new_shndx=%x new_vis=%x old_bind=%x old_shndx=%x old_vis=%x\n", - sym_bind, sh_num, new_vis, esym_bind, esym->st_shndx, esym_vis); -#endif - error_noabort("'%s' defined twice", name); - } - } else { - do_patch: - esym->st_info = ELFW(ST_INFO)(sym_bind, sym_type); - esym->st_shndx = sh_num; - esym->st_value = value; - esym->st_size = size; - esym->st_other = other; - } - } else { - do_def: - sym_index = put_elf_sym(s, value, size, - ELFW(ST_INFO)(sym_bind, sym_type), other, - sh_num, name); - } - return sym_index; -} - -/* put relocation */ -static void put_elf_reloc(Section *symtab, Section *s, unsigned long offset, - int type, int symbol) -{ - char buf[256]; - Section *sr; - ElfW_Rel *rel; - - sr = s->reloc; - if (!sr) { - /* if no relocation section, create it */ - snprintf(buf, sizeof(buf), REL_SECTION_FMT, s->name); - /* if the symtab is allocated, then we consider the relocation - are also */ - sr = new_section(tcc_state, buf, SHT_RELX, symtab->sh_flags); - sr->sh_entsize = sizeof(ElfW_Rel); - sr->link = symtab; - sr->sh_info = s->sh_num; - s->reloc = sr; - } - rel = section_ptr_add(sr, sizeof(ElfW_Rel)); - rel->r_offset = offset; - rel->r_info = ELFW(R_INFO)(symbol, type); -#ifdef TCC_TARGET_X86_64 - rel->r_addend = 0; -#endif -} - -/* put stab debug information */ - -typedef struct { - unsigned int n_strx; /* index into string table of name */ - unsigned char n_type; /* type of symbol */ - unsigned char n_other; /* misc info (usually empty) */ - unsigned short n_desc; /* description field */ - unsigned int n_value; /* value of symbol */ -} Stab_Sym; - -static void put_stabs(const char *str, int type, int other, int desc, - unsigned long value) -{ - Stab_Sym *sym; - - sym = section_ptr_add(stab_section, sizeof(Stab_Sym)); - if (str) { - sym->n_strx = put_elf_str(stabstr_section, str); - } else { - sym->n_strx = 0; - } - sym->n_type = type; - sym->n_other = other; - sym->n_desc = desc; - sym->n_value = value; -} - -static void put_stabs_r(const char *str, int type, int other, int desc, - unsigned long value, Section *sec, int sym_index) -{ - put_stabs(str, type, other, desc, value); - put_elf_reloc(symtab_section, stab_section, - stab_section->data_offset - sizeof(unsigned int), - R_DATA_32, sym_index); -} - -static void put_stabn(int type, int other, int desc, int value) -{ - put_stabs(NULL, type, other, desc, value); -} - -static void put_stabd(int type, int other, int desc) -{ - put_stabs(NULL, type, other, desc, 0); -} - -/* In an ELF file symbol table, the local symbols must appear below - the global and weak ones. Since TCC cannot sort it while generating - the code, we must do it after. All the relocation tables are also - modified to take into account the symbol table sorting */ -static void sort_syms(TCCState *s1, Section *s) -{ - int *old_to_new_syms; - ElfW(Sym) *new_syms; - int nb_syms, i; - ElfW(Sym) *p, *q; - ElfW_Rel *rel, *rel_end; - Section *sr; - int type, sym_index; - - nb_syms = s->data_offset / sizeof(ElfW(Sym)); - new_syms = tcc_malloc(nb_syms * sizeof(ElfW(Sym))); - old_to_new_syms = tcc_malloc(nb_syms * sizeof(int)); - - /* first pass for local symbols */ - p = (ElfW(Sym) *)s->data; - q = new_syms; - for(i = 0; i < nb_syms; i++) { - if (ELFW(ST_BIND)(p->st_info) == STB_LOCAL) { - old_to_new_syms[i] = q - new_syms; - *q++ = *p; - } - p++; - } - /* save the number of local symbols in section header */ - s->sh_info = q - new_syms; - - /* then second pass for non local symbols */ - p = (ElfW(Sym) *)s->data; - for(i = 0; i < nb_syms; i++) { - if (ELFW(ST_BIND)(p->st_info) != STB_LOCAL) { - old_to_new_syms[i] = q - new_syms; - *q++ = *p; - } - p++; - } - - /* we copy the new symbols to the old */ - memcpy(s->data, new_syms, nb_syms * sizeof(ElfW(Sym))); - tcc_free(new_syms); - - /* now we modify all the relocations */ - for(i = 1; i < s1->nb_sections; i++) { - sr = s1->sections[i]; - if (sr->sh_type == SHT_RELX && sr->link == s) { - rel_end = (ElfW_Rel *)(sr->data + sr->data_offset); - for(rel = (ElfW_Rel *)sr->data; - rel < rel_end; - rel++) { - sym_index = ELFW(R_SYM)(rel->r_info); - type = ELFW(R_TYPE)(rel->r_info); - sym_index = old_to_new_syms[sym_index]; - rel->r_info = ELFW(R_INFO)(sym_index, type); - } - } - } - - tcc_free(old_to_new_syms); -} - -/* relocate common symbols in the .bss section */ -static void relocate_common_syms(void) -{ - ElfW(Sym) *sym, *sym_end; - unsigned long offset, align; - - sym_end = (ElfW(Sym) *)(symtab_section->data + symtab_section->data_offset); - for(sym = (ElfW(Sym) *)symtab_section->data + 1; - sym < sym_end; - sym++) { - if (sym->st_shndx == SHN_COMMON) { - /* align symbol */ - align = sym->st_value; - offset = bss_section->data_offset; - offset = (offset + align - 1) & -align; - sym->st_value = offset; - sym->st_shndx = bss_section->sh_num; - offset += sym->st_size; - bss_section->data_offset = offset; - } - } -} - -/* relocate symbol table, resolve undefined symbols if do_resolve is - true and output error if undefined symbol. */ -static void relocate_syms(TCCState *s1, int do_resolve) -{ - ElfW(Sym) *sym, *esym, *sym_end; - int sym_bind, sh_num, sym_index; - const char *name; - unsigned long addr; - - sym_end = (ElfW(Sym) *)(symtab_section->data + symtab_section->data_offset); - for(sym = (ElfW(Sym) *)symtab_section->data + 1; - sym < sym_end; - sym++) { - sh_num = sym->st_shndx; - if (sh_num == SHN_UNDEF) { - name = strtab_section->data + sym->st_name; - if (do_resolve) { - name = symtab_section->link->data + sym->st_name; - addr = (unsigned long)resolve_sym(s1, name, ELFW(ST_TYPE)(sym->st_info)); - if (addr) { - sym->st_value = addr; - goto found; - } - } else if (s1->dynsym) { - /* if dynamic symbol exist, then use it */ - sym_index = find_elf_sym(s1->dynsym, name); - if (sym_index) { - esym = &((ElfW(Sym) *)s1->dynsym->data)[sym_index]; - sym->st_value = esym->st_value; - goto found; - } - } - /* XXX: _fp_hw seems to be part of the ABI, so we ignore - it */ - if (!strcmp(name, "_fp_hw")) - goto found; - /* only weak symbols are accepted to be undefined. Their - value is zero */ - sym_bind = ELFW(ST_BIND)(sym->st_info); - if (sym_bind == STB_WEAK) { - sym->st_value = 0; - } else { - error_noabort("undefined symbol '%s'", name); - } - } else if (sh_num < SHN_LORESERVE) { - /* add section base */ - sym->st_value += s1->sections[sym->st_shndx]->sh_addr; - } - found: ; - } -} - -#ifdef TCC_TARGET_X86_64 -#define JMP_TABLE_ENTRY_SIZE 14 -static unsigned long add_jmp_table(TCCState *s1, unsigned long val) -{ - char *p = s1->runtime_plt_and_got + s1->runtime_plt_and_got_offset; - s1->runtime_plt_and_got_offset += JMP_TABLE_ENTRY_SIZE; - /* jmp *0x0(%rip) */ - p[0] = 0xff; - p[1] = 0x25; - *(int *)(p + 2) = 0; - *(unsigned long *)(p + 6) = val; - return (unsigned long)p; -} - -static unsigned long add_got_table(TCCState *s1, unsigned long val) -{ - unsigned long *p =(unsigned long *)(s1->runtime_plt_and_got + - s1->runtime_plt_and_got_offset); - s1->runtime_plt_and_got_offset += sizeof(void *); - *p = val; - return (unsigned long)p; -} -#endif - -/* relocate a given section (CPU dependent) */ -static void relocate_section(TCCState *s1, Section *s) -{ - Section *sr; - ElfW_Rel *rel, *rel_end, *qrel; - ElfW(Sym) *sym; - int type, sym_index; - unsigned char *ptr; - unsigned long val, addr; -#if defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64 - int esym_index; -#endif - - sr = s->reloc; - rel_end = (ElfW_Rel *)(sr->data + sr->data_offset); - qrel = (ElfW_Rel *)sr->data; - for(rel = qrel; - rel < rel_end; - rel++) { - ptr = s->data + rel->r_offset; - - sym_index = ELFW(R_SYM)(rel->r_info); - sym = &((ElfW(Sym) *)symtab_section->data)[sym_index]; - val = sym->st_value; -#ifdef TCC_TARGET_X86_64 - /* XXX: not tested */ - val += rel->r_addend; -#endif - type = ELFW(R_TYPE)(rel->r_info); - addr = s->sh_addr + rel->r_offset; - - /* CPU specific */ - switch(type) { -#if defined(TCC_TARGET_I386) - case R_386_32: - if (s1->output_type == TCC_OUTPUT_DLL) { - esym_index = s1->symtab_to_dynsym[sym_index]; - qrel->r_offset = rel->r_offset; - if (esym_index) { - qrel->r_info = ELFW(R_INFO)(esym_index, R_386_32); - qrel++; - break; - } else { - qrel->r_info = ELFW(R_INFO)(0, R_386_RELATIVE); - qrel++; - } - } - *(int *)ptr += val; - break; - case R_386_PC32: - if (s1->output_type == TCC_OUTPUT_DLL) { - /* DLL relocation */ - esym_index = s1->symtab_to_dynsym[sym_index]; - if (esym_index) { - qrel->r_offset = rel->r_offset; - qrel->r_info = ELFW(R_INFO)(esym_index, R_386_PC32); - qrel++; - break; - } - } - *(int *)ptr += val - addr; - break; - case R_386_PLT32: - *(int *)ptr += val - addr; - break; - case R_386_GLOB_DAT: - case R_386_JMP_SLOT: - *(int *)ptr = val; - break; - case R_386_GOTPC: - *(int *)ptr += s1->got->sh_addr - addr; - break; - case R_386_GOTOFF: - *(int *)ptr += val - s1->got->sh_addr; - break; - case R_386_GOT32: - /* we load the got offset */ - *(int *)ptr += s1->got_offsets[sym_index]; - break; -#elif defined(TCC_TARGET_ARM) - case R_ARM_PC24: - case R_ARM_CALL: - case R_ARM_JUMP24: - case R_ARM_PLT32: - { - int x; - x = (*(int *)ptr)&0xffffff; - (*(int *)ptr) &= 0xff000000; - if (x & 0x800000) - x -= 0x1000000; - x *= 4; - x += val - addr; - if((x & 3) != 0 || x >= 0x4000000 || x < -0x4000000) - error("can't relocate value at %x",addr); - x >>= 2; - x &= 0xffffff; - (*(int *)ptr) |= x; - } - break; - case R_ARM_PREL31: - { - int x; - x = (*(int *)ptr) & 0x7fffffff; - (*(int *)ptr) &= 0x80000000; - x = (x * 2) / 2; - x += val - addr; - if((x^(x>>1))&0x40000000) - error("can't relocate value at %x",addr); - (*(int *)ptr) |= x & 0x7fffffff; - } - case R_ARM_ABS32: - *(int *)ptr += val; - break; - case R_ARM_BASE_PREL: - *(int *)ptr += s1->got->sh_addr - addr; - break; - case R_ARM_GOTOFF32: - *(int *)ptr += val - s1->got->sh_addr; - break; - case R_ARM_GOT_BREL: - /* we load the got offset */ - *(int *)ptr += s1->got_offsets[sym_index]; - break; - case R_ARM_COPY: - break; - default: - fprintf(stderr,"FIXME: handle reloc type %x at %lx [%.8x] to %lx\n", - type,addr,(unsigned int )ptr,val); - break; -#elif defined(TCC_TARGET_C67) - case R_C60_32: - *(int *)ptr += val; - break; - case R_C60LO16: - { - uint32_t orig; - - /* put the low 16 bits of the absolute address */ - // add to what is already there - - orig = ((*(int *)(ptr )) >> 7) & 0xffff; - orig |= (((*(int *)(ptr+4)) >> 7) & 0xffff) << 16; - - //patch both at once - assumes always in pairs Low - High - - *(int *) ptr = (*(int *) ptr & (~(0xffff << 7)) ) | (((val+orig) & 0xffff) << 7); - *(int *)(ptr+4) = (*(int *)(ptr+4) & (~(0xffff << 7)) ) | ((((val+orig)>>16) & 0xffff) << 7); - } - break; - case R_C60HI16: - break; - default: - fprintf(stderr,"FIXME: handle reloc type %x at %lx [%.8x] to %lx\n", - type,addr,(unsigned int )ptr,val); - break; -#elif defined(TCC_TARGET_X86_64) - case R_X86_64_64: - if (s1->output_type == TCC_OUTPUT_DLL) { - qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE); - qrel->r_addend = *(long long *)ptr + val; - qrel++; - } - *(long long *)ptr += val; - break; - case R_X86_64_32: - case R_X86_64_32S: - if (s1->output_type == TCC_OUTPUT_DLL) { - /* XXX: this logic may depend on TCC's codegen - now TCC uses R_X86_64_32 even for a 64bit pointer */ - qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE); - qrel->r_addend = *(int *)ptr + val; - qrel++; - } - *(int *)ptr += val; - break; - case R_X86_64_PC32: { - if (s1->output_type == TCC_OUTPUT_DLL) { - /* DLL relocation */ - esym_index = s1->symtab_to_dynsym[sym_index]; - if (esym_index) { - qrel->r_offset = rel->r_offset; - qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_PC32); - qrel->r_addend = *(int *)ptr; - qrel++; - break; - } - } - long diff = val - addr; - if (diff <= -2147483647 || diff > 2147483647) { - /* XXX: naive support for over 32bit jump */ - if (s1->output_type == TCC_OUTPUT_MEMORY) { - val = add_jmp_table(s1, val); - diff = val - addr; - } - if (diff <= -2147483647 || diff > 2147483647) { - error("internal error: relocation failed"); - } - } - *(int *)ptr += diff; - } - break; - case R_X86_64_PLT32: - *(int *)ptr += val - addr; - break; - case R_X86_64_GLOB_DAT: - case R_X86_64_JUMP_SLOT: - *(int *)ptr = val; - break; - case R_X86_64_GOTPCREL: - if (s1->output_type == TCC_OUTPUT_MEMORY) { - val = add_got_table(s1, val - rel->r_addend) + rel->r_addend; - *(int *)ptr += val - addr; - break; - } - *(int *)ptr += (s1->got->sh_addr - addr + - s1->got_offsets[sym_index] - 4); - break; - case R_X86_64_GOTTPOFF: - *(int *)ptr += val - s1->got->sh_addr; - break; - case R_X86_64_GOT32: - /* we load the got offset */ - *(int *)ptr += s1->got_offsets[sym_index]; - break; -#else -#error unsupported processor -#endif - } - } - /* if the relocation is allocated, we change its symbol table */ - if (sr->sh_flags & SHF_ALLOC) - sr->link = s1->dynsym; -} - -/* relocate relocation table in 'sr' */ -static void relocate_rel(TCCState *s1, Section *sr) -{ - Section *s; - ElfW_Rel *rel, *rel_end; - - s = s1->sections[sr->sh_info]; - rel_end = (ElfW_Rel *)(sr->data + sr->data_offset); - for(rel = (ElfW_Rel *)sr->data; - rel < rel_end; - rel++) { - rel->r_offset += s->sh_addr; - } -} - -/* count the number of dynamic relocations so that we can reserve - their space */ -static int prepare_dynamic_rel(TCCState *s1, Section *sr) -{ - ElfW_Rel *rel, *rel_end; - int sym_index, esym_index, type, count; - - count = 0; - rel_end = (ElfW_Rel *)(sr->data + sr->data_offset); - for(rel = (ElfW_Rel *)sr->data; rel < rel_end; rel++) { - sym_index = ELFW(R_SYM)(rel->r_info); - type = ELFW(R_TYPE)(rel->r_info); - switch(type) { -#if defined(TCC_TARGET_I386) - case R_386_32: -#elif defined(TCC_TARGET_X86_64) - case R_X86_64_32: - case R_X86_64_32S: - case R_X86_64_64: -#endif - count++; - break; -#if defined(TCC_TARGET_I386) - case R_386_PC32: -#elif defined(TCC_TARGET_X86_64) - case R_X86_64_PC32: -#endif - esym_index = s1->symtab_to_dynsym[sym_index]; - if (esym_index) - count++; - break; - default: - break; - } - } - if (count) { - /* allocate the section */ - sr->sh_flags |= SHF_ALLOC; - sr->sh_size = count * sizeof(ElfW_Rel); - } - return count; -} - -static void put_got_offset(TCCState *s1, int index, unsigned long val) -{ - int n; - unsigned long *tab; - - if (index >= s1->nb_got_offsets) { - /* find immediately bigger power of 2 and reallocate array */ - n = 1; - while (index >= n) - n *= 2; - tab = tcc_realloc(s1->got_offsets, n * sizeof(unsigned long)); - if (!tab) - error("memory full"); - s1->got_offsets = tab; - memset(s1->got_offsets + s1->nb_got_offsets, 0, - (n - s1->nb_got_offsets) * sizeof(unsigned long)); - s1->nb_got_offsets = n; - } - s1->got_offsets[index] = val; -} - -/* XXX: suppress that */ -static void put32(unsigned char *p, uint32_t val) -{ - p[0] = val; - p[1] = val >> 8; - p[2] = val >> 16; - p[3] = val >> 24; -} - -#if defined(TCC_TARGET_I386) || defined(TCC_TARGET_ARM) || \ - defined(TCC_TARGET_X86_64) -static uint32_t get32(unsigned char *p) -{ - return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24); -} -#endif - -static void build_got(TCCState *s1) -{ - unsigned char *ptr; - - /* if no got, then create it */ - s1->got = new_section(s1, ".got", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE); - s1->got->sh_entsize = 4; - add_elf_sym(symtab_section, 0, 4, ELFW(ST_INFO)(STB_GLOBAL, STT_OBJECT), - 0, s1->got->sh_num, "_GLOBAL_OFFSET_TABLE_"); - ptr = section_ptr_add(s1->got, 3 * PTR_SIZE); -#if PTR_SIZE == 4 - /* keep space for _DYNAMIC pointer, if present */ - put32(ptr, 0); - /* two dummy got entries */ - put32(ptr + 4, 0); - put32(ptr + 8, 0); -#else - /* keep space for _DYNAMIC pointer, if present */ - put32(ptr, 0); - put32(ptr + 4, 0); - /* two dummy got entries */ - put32(ptr + 8, 0); - put32(ptr + 12, 0); - put32(ptr + 16, 0); - put32(ptr + 20, 0); -#endif -} - -/* put a got entry corresponding to a symbol in symtab_section. 'size' - and 'info' can be modifed if more precise info comes from the DLL */ -static void put_got_entry(TCCState *s1, - int reloc_type, unsigned long size, int info, - int sym_index) -{ - int index; - const char *name; - ElfW(Sym) *sym; - unsigned long offset; - int *ptr; - - if (!s1->got) - build_got(s1); - - /* if a got entry already exists for that symbol, no need to add one */ - if (sym_index < s1->nb_got_offsets && - s1->got_offsets[sym_index] != 0) - return; - - put_got_offset(s1, sym_index, s1->got->data_offset); - - if (s1->dynsym) { - sym = &((ElfW(Sym) *)symtab_section->data)[sym_index]; - name = symtab_section->link->data + sym->st_name; - offset = sym->st_value; -#if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64) - if (reloc_type == -#ifdef TCC_TARGET_X86_64 - R_X86_64_JUMP_SLOT -#else - R_386_JMP_SLOT -#endif - ) { - Section *plt; - uint8_t *p; - int modrm; - -#if defined(TCC_OUTPUT_DLL_WITH_PLT) - modrm = 0x25; -#else - /* if we build a DLL, we add a %ebx offset */ - if (s1->output_type == TCC_OUTPUT_DLL) - modrm = 0xa3; - else - modrm = 0x25; -#endif - - /* add a PLT entry */ - plt = s1->plt; - if (plt->data_offset == 0) { - /* first plt entry */ - p = section_ptr_add(plt, 16); - p[0] = 0xff; /* pushl got + PTR_SIZE */ - p[1] = modrm + 0x10; - put32(p + 2, PTR_SIZE); - p[6] = 0xff; /* jmp *(got + PTR_SIZE * 2) */ - p[7] = modrm; - put32(p + 8, PTR_SIZE * 2); - } - - p = section_ptr_add(plt, 16); - p[0] = 0xff; /* jmp *(got + x) */ - p[1] = modrm; - put32(p + 2, s1->got->data_offset); - p[6] = 0x68; /* push $xxx */ - put32(p + 7, (plt->data_offset - 32) >> 1); - p[11] = 0xe9; /* jmp plt_start */ - put32(p + 12, -(plt->data_offset)); - - /* the symbol is modified so that it will be relocated to - the PLT */ -#if !defined(TCC_OUTPUT_DLL_WITH_PLT) - if (s1->output_type == TCC_OUTPUT_EXE) -#endif - offset = plt->data_offset - 16; - } -#elif defined(TCC_TARGET_ARM) - if (reloc_type == R_ARM_JUMP_SLOT) { - Section *plt; - uint8_t *p; - - /* if we build a DLL, we add a %ebx offset */ - if (s1->output_type == TCC_OUTPUT_DLL) - error("DLLs unimplemented!"); - - /* add a PLT entry */ - plt = s1->plt; - if (plt->data_offset == 0) { - /* first plt entry */ - p = section_ptr_add(plt, 16); - put32(p , 0xe52de004); - put32(p + 4, 0xe59fe010); - put32(p + 8, 0xe08fe00e); - put32(p + 12, 0xe5bef008); - } - - p = section_ptr_add(plt, 16); - put32(p , 0xe59fc004); - put32(p+4, 0xe08fc00c); - put32(p+8, 0xe59cf000); - put32(p+12, s1->got->data_offset); - - /* the symbol is modified so that it will be relocated to - the PLT */ - if (s1->output_type == TCC_OUTPUT_EXE) - offset = plt->data_offset - 16; - } -#elif defined(TCC_TARGET_C67) - error("C67 got not implemented"); -#else -#error unsupported CPU -#endif - index = put_elf_sym(s1->dynsym, offset, - size, info, 0, sym->st_shndx, name); - /* put a got entry */ - put_elf_reloc(s1->dynsym, s1->got, - s1->got->data_offset, - reloc_type, index); - } - ptr = section_ptr_add(s1->got, PTR_SIZE); - *ptr = 0; -} - -/* build GOT and PLT entries */ -static void build_got_entries(TCCState *s1) -{ - Section *s, *symtab; - ElfW_Rel *rel, *rel_end; - ElfW(Sym) *sym; - int i, type, reloc_type, sym_index; - - for(i = 1; i < s1->nb_sections; i++) { - s = s1->sections[i]; - if (s->sh_type != SHT_RELX) - continue; - /* no need to handle got relocations */ - if (s->link != symtab_section) - continue; - symtab = s->link; - rel_end = (ElfW_Rel *)(s->data + s->data_offset); - for(rel = (ElfW_Rel *)s->data; - rel < rel_end; - rel++) { - type = ELFW(R_TYPE)(rel->r_info); - switch(type) { -#if defined(TCC_TARGET_I386) - case R_386_GOT32: - case R_386_GOTOFF: - case R_386_GOTPC: - case R_386_PLT32: - if (!s1->got) - build_got(s1); - if (type == R_386_GOT32 || type == R_386_PLT32) { - sym_index = ELFW(R_SYM)(rel->r_info); - sym = &((ElfW(Sym) *)symtab_section->data)[sym_index]; - /* look at the symbol got offset. If none, then add one */ - if (type == R_386_GOT32) - reloc_type = R_386_GLOB_DAT; - else - reloc_type = R_386_JMP_SLOT; - put_got_entry(s1, reloc_type, sym->st_size, sym->st_info, - sym_index); - } - break; -#elif defined(TCC_TARGET_ARM) - case R_ARM_GOT_BREL: - case R_ARM_GOTOFF32: - case R_ARM_BASE_PREL: - case R_ARM_PLT32: - if (!s1->got) - build_got(s1); - if (type == R_ARM_GOT_BREL || type == R_ARM_PLT32) { - sym_index = ELFW(R_SYM)(rel->r_info); - sym = &((ElfW(Sym) *)symtab_section->data)[sym_index]; - /* look at the symbol got offset. If none, then add one */ - if (type == R_ARM_GOT_BREL) - reloc_type = R_ARM_GLOB_DAT; - else - reloc_type = R_ARM_JUMP_SLOT; - put_got_entry(s1, reloc_type, sym->st_size, sym->st_info, - sym_index); - } - break; -#elif defined(TCC_TARGET_C67) - case R_C60_GOT32: - case R_C60_GOTOFF: - case R_C60_GOTPC: - case R_C60_PLT32: - if (!s1->got) - build_got(s1); - if (type == R_C60_GOT32 || type == R_C60_PLT32) { - sym_index = ELFW(R_SYM)(rel->r_info); - sym = &((ElfW(Sym) *)symtab_section->data)[sym_index]; - /* look at the symbol got offset. If none, then add one */ - if (type == R_C60_GOT32) - reloc_type = R_C60_GLOB_DAT; - else - reloc_type = R_C60_JMP_SLOT; - put_got_entry(s1, reloc_type, sym->st_size, sym->st_info, - sym_index); - } - break; -#elif defined(TCC_TARGET_X86_64) - case R_X86_64_GOT32: - case R_X86_64_GOTTPOFF: - case R_X86_64_GOTPCREL: - case R_X86_64_PLT32: - if (!s1->got) - build_got(s1); - if (type == R_X86_64_GOT32 || type == R_X86_64_GOTPCREL || - type == R_X86_64_PLT32) { - sym_index = ELFW(R_SYM)(rel->r_info); - sym = &((ElfW(Sym) *)symtab_section->data)[sym_index]; - /* look at the symbol got offset. If none, then add one */ - if (type == R_X86_64_GOT32 || type == R_X86_64_GOTPCREL) - reloc_type = R_X86_64_GLOB_DAT; - else - reloc_type = R_X86_64_JUMP_SLOT; - put_got_entry(s1, reloc_type, sym->st_size, sym->st_info, - sym_index); - } - break; -#else -#error unsupported CPU -#endif - default: - break; - } - } - } -} - -static Section *new_symtab(TCCState *s1, - const char *symtab_name, int sh_type, int sh_flags, - const char *strtab_name, - const char *hash_name, int hash_sh_flags) -{ - Section *symtab, *strtab, *hash; - int *ptr, nb_buckets; - - symtab = new_section(s1, symtab_name, sh_type, sh_flags); - symtab->sh_entsize = sizeof(ElfW(Sym)); - strtab = new_section(s1, strtab_name, SHT_STRTAB, sh_flags); - put_elf_str(strtab, ""); - symtab->link = strtab; - put_elf_sym(symtab, 0, 0, 0, 0, 0, NULL); - - nb_buckets = 1; - - hash = new_section(s1, hash_name, SHT_HASH, hash_sh_flags); - hash->sh_entsize = sizeof(int); - symtab->hash = hash; - hash->link = symtab; - - ptr = section_ptr_add(hash, (2 + nb_buckets + 1) * sizeof(int)); - ptr[0] = nb_buckets; - ptr[1] = 1; - memset(ptr + 2, 0, (nb_buckets + 1) * sizeof(int)); - return symtab; -} - -/* put dynamic tag */ -static void put_dt(Section *dynamic, int dt, unsigned long val) -{ - ElfW(Dyn) *dyn; - dyn = section_ptr_add(dynamic, sizeof(ElfW(Dyn))); - dyn->d_tag = dt; - dyn->d_un.d_val = val; -} - -static void add_init_array_defines(TCCState *s1, const char *section_name) -{ - Section *s; - long end_offset; - char sym_start[1024]; - char sym_end[1024]; - - snprintf(sym_start, sizeof(sym_start), "__%s_start", section_name + 1); - snprintf(sym_end, sizeof(sym_end), "__%s_end", section_name + 1); - - s = find_section(s1, section_name); - if (!s) { - end_offset = 0; - s = data_section; - } else { - end_offset = s->data_offset; - } - - add_elf_sym(symtab_section, - 0, 0, - ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0, - s->sh_num, sym_start); - add_elf_sym(symtab_section, - end_offset, 0, - ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0, - s->sh_num, sym_end); -} - -/* add tcc runtime libraries */ -static void tcc_add_runtime(TCCState *s1) -{ -#if defined(CONFIG_TCC_BCHECK) || !defined(CONFIG_USE_LIBGCC) - char buf[1024]; -#endif - -#ifdef CONFIG_TCC_BCHECK - if (s1->do_bounds_check) { - unsigned long *ptr; - Section *init_section; - unsigned char *pinit; - int sym_index; - - /* XXX: add an object file to do that */ - ptr = section_ptr_add(bounds_section, sizeof(unsigned long)); - *ptr = 0; - add_elf_sym(symtab_section, 0, 0, - ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0, - bounds_section->sh_num, "__bounds_start"); - /* add bound check code */ - snprintf(buf, sizeof(buf), "%s/%s", s1->tcc_lib_path, "bcheck.o"); - tcc_add_file(s1, buf); -#ifdef TCC_TARGET_I386 - if (s1->output_type != TCC_OUTPUT_MEMORY) { - /* add 'call __bound_init()' in .init section */ - init_section = find_section(s1, ".init"); - pinit = section_ptr_add(init_section, 5); - pinit[0] = 0xe8; - put32(pinit + 1, -4); - sym_index = find_elf_sym(symtab_section, "__bound_init"); - put_elf_reloc(symtab_section, init_section, - init_section->data_offset - 4, R_386_PC32, sym_index); - } -#endif - } -#endif - /* add libc */ - if (!s1->nostdlib) { - tcc_add_library(s1, "c"); - -#ifdef CONFIG_USE_LIBGCC - tcc_add_file(s1, CONFIG_SYSROOT "/lib/libgcc_s.so.1"); -#else - snprintf(buf, sizeof(buf), "%s/%s", s1->tcc_lib_path, "libtcc1.a"); - tcc_add_file(s1, buf); -#endif - } - /* add crt end if not memory output */ - if (s1->output_type != TCC_OUTPUT_MEMORY && !s1->nostdlib) { - tcc_add_file(s1, CONFIG_TCC_CRT_PREFIX "/crtn.o"); - } -} - -/* add various standard linker symbols (must be done after the - sections are filled (for example after allocating common - symbols)) */ -static void tcc_add_linker_symbols(TCCState *s1) -{ - char buf[1024]; - int i; - Section *s; - - add_elf_sym(symtab_section, - text_section->data_offset, 0, - ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0, - text_section->sh_num, "_etext"); - add_elf_sym(symtab_section, - data_section->data_offset, 0, - ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0, - data_section->sh_num, "_edata"); - add_elf_sym(symtab_section, - bss_section->data_offset, 0, - ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0, - bss_section->sh_num, "_end"); - /* horrible new standard ldscript defines */ - add_init_array_defines(s1, ".preinit_array"); - add_init_array_defines(s1, ".init_array"); - add_init_array_defines(s1, ".fini_array"); - - /* add start and stop symbols for sections whose name can be - expressed in C */ - for(i = 1; i < s1->nb_sections; i++) { - s = s1->sections[i]; - if (s->sh_type == SHT_PROGBITS && - (s->sh_flags & SHF_ALLOC)) { - const char *p; - int ch; - - /* check if section name can be expressed in C */ - p = s->name; - for(;;) { - ch = *p; - if (!ch) - break; - if (!isid(ch) && !isnum(ch)) - goto next_sec; - p++; - } - snprintf(buf, sizeof(buf), "__start_%s", s->name); - add_elf_sym(symtab_section, - 0, 0, - ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0, - s->sh_num, buf); - snprintf(buf, sizeof(buf), "__stop_%s", s->name); - add_elf_sym(symtab_section, - s->data_offset, 0, - ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0, - s->sh_num, buf); - } - next_sec: ; - } -} - -/* name of ELF interpreter */ -#if defined __FreeBSD__ -static char elf_interp[] = "/usr/libexec/ld-elf.so.1"; -#elif defined TCC_ARM_EABI -static char elf_interp[] = "/lib/ld-linux.so.3"; -#elif defined(TCC_TARGET_X86_64) -static char elf_interp[] = "/lib/ld-linux-x86-64.so.2"; -#elif defined(TCC_UCLIBC) -static char elf_interp[] = "/lib/ld-uClibc.so.0"; -#else -static char elf_interp[] = "/lib/ld-linux.so.2"; -#endif - -static void tcc_output_binary(TCCState *s1, FILE *f, - const int *section_order) -{ - Section *s; - int i, offset, size; - - offset = 0; - for(i=1;i<s1->nb_sections;i++) { - s = s1->sections[section_order[i]]; - if (s->sh_type != SHT_NOBITS && - (s->sh_flags & SHF_ALLOC)) { - while (offset < s->sh_offset) { - fputc(0, f); - offset++; - } - size = s->sh_size; - fwrite(s->data, 1, size, f); - offset += size; - } - } -} - -/* output an ELF file */ -/* XXX: suppress unneeded sections */ -int elf_output_file(TCCState *s1, const char *filename) -{ - ElfW(Ehdr) ehdr; - FILE *f; - int fd, mode, ret; - int *section_order; - int shnum, i, phnum, file_offset, offset, size, j, tmp, sh_order_index, k; - unsigned long addr; - Section *strsec, *s; - ElfW(Shdr) shdr, *sh; - ElfW(Phdr) *phdr, *ph; - Section *interp, *dynamic, *dynstr; - unsigned long saved_dynamic_data_offset; - ElfW(Sym) *sym; - int type, file_type; - unsigned long rel_addr, rel_size; - - file_type = s1->output_type; - s1->nb_errors = 0; - - if (file_type != TCC_OUTPUT_OBJ) { - tcc_add_runtime(s1); - } - - phdr = NULL; - section_order = NULL; - interp = NULL; - dynamic = NULL; - dynstr = NULL; /* avoid warning */ - saved_dynamic_data_offset = 0; /* avoid warning */ - - if (file_type != TCC_OUTPUT_OBJ) { - relocate_common_syms(); - - tcc_add_linker_symbols(s1); - - if (!s1->static_link) { - const char *name; - int sym_index, index; - ElfW(Sym) *esym, *sym_end; - - if (file_type == TCC_OUTPUT_EXE) { - char *ptr; - /* add interpreter section only if executable */ - interp = new_section(s1, ".interp", SHT_PROGBITS, SHF_ALLOC); - interp->sh_addralign = 1; - ptr = section_ptr_add(interp, sizeof(elf_interp)); - strcpy(ptr, elf_interp); - } - - /* add dynamic symbol table */ - s1->dynsym = new_symtab(s1, ".dynsym", SHT_DYNSYM, SHF_ALLOC, - ".dynstr", - ".hash", SHF_ALLOC); - dynstr = s1->dynsym->link; - - /* add dynamic section */ - dynamic = new_section(s1, ".dynamic", SHT_DYNAMIC, - SHF_ALLOC | SHF_WRITE); - dynamic->link = dynstr; - dynamic->sh_entsize = sizeof(ElfW(Dyn)); - - /* add PLT */ - s1->plt = new_section(s1, ".plt", SHT_PROGBITS, - SHF_ALLOC | SHF_EXECINSTR); - s1->plt->sh_entsize = 4; - - build_got(s1); - - /* scan for undefined symbols and see if they are in the - dynamic symbols. If a symbol STT_FUNC is found, then we - add it in the PLT. If a symbol STT_OBJECT is found, we - add it in the .bss section with a suitable relocation */ - sym_end = (ElfW(Sym) *)(symtab_section->data + - symtab_section->data_offset); - if (file_type == TCC_OUTPUT_EXE) { - for(sym = (ElfW(Sym) *)symtab_section->data + 1; - sym < sym_end; - sym++) { - if (sym->st_shndx == SHN_UNDEF) { - name = symtab_section->link->data + sym->st_name; - sym_index = find_elf_sym(s1->dynsymtab_section, name); - if (sym_index) { - esym = &((ElfW(Sym) *)s1->dynsymtab_section->data)[sym_index]; - type = ELFW(ST_TYPE)(esym->st_info); - if (type == STT_FUNC) { - put_got_entry(s1, R_JMP_SLOT, esym->st_size, - esym->st_info, - sym - (ElfW(Sym) *)symtab_section->data); - } else if (type == STT_OBJECT) { - unsigned long offset; - offset = bss_section->data_offset; - /* XXX: which alignment ? */ - offset = (offset + 16 - 1) & -16; - index = put_elf_sym(s1->dynsym, offset, esym->st_size, - esym->st_info, 0, - bss_section->sh_num, name); - put_elf_reloc(s1->dynsym, bss_section, - offset, R_COPY, index); - offset += esym->st_size; - bss_section->data_offset = offset; - } - } else { - /* STB_WEAK undefined symbols are accepted */ - /* XXX: _fp_hw seems to be part of the ABI, so we ignore - it */ - if (ELFW(ST_BIND)(sym->st_info) == STB_WEAK || - !strcmp(name, "_fp_hw")) { - } else { - error_noabort("undefined symbol '%s'", name); - } - } - } else if (s1->rdynamic && - ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) { - /* if -rdynamic option, then export all non - local symbols */ - name = symtab_section->link->data + sym->st_name; - put_elf_sym(s1->dynsym, sym->st_value, sym->st_size, - sym->st_info, 0, - sym->st_shndx, name); - } - } - - if (s1->nb_errors) - goto fail; - - /* now look at unresolved dynamic symbols and export - corresponding symbol */ - sym_end = (ElfW(Sym) *)(s1->dynsymtab_section->data + - s1->dynsymtab_section->data_offset); - for(esym = (ElfW(Sym) *)s1->dynsymtab_section->data + 1; - esym < sym_end; - esym++) { - if (esym->st_shndx == SHN_UNDEF) { - name = s1->dynsymtab_section->link->data + esym->st_name; - sym_index = find_elf_sym(symtab_section, name); - if (sym_index) { - /* XXX: avoid adding a symbol if already - present because of -rdynamic ? */ - sym = &((ElfW(Sym) *)symtab_section->data)[sym_index]; - put_elf_sym(s1->dynsym, sym->st_value, sym->st_size, - sym->st_info, 0, - sym->st_shndx, name); - } else { - if (ELFW(ST_BIND)(esym->st_info) == STB_WEAK) { - /* weak symbols can stay undefined */ - } else { - warning("undefined dynamic symbol '%s'", name); - } - } - } - } - } else { - int nb_syms; - /* shared library case : we simply export all the global symbols */ - nb_syms = symtab_section->data_offset / sizeof(ElfW(Sym)); - s1->symtab_to_dynsym = tcc_mallocz(sizeof(int) * nb_syms); - for(sym = (ElfW(Sym) *)symtab_section->data + 1; - sym < sym_end; - sym++) { - if (ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) { -#if defined(TCC_OUTPUT_DLL_WITH_PLT) - if (ELFW(ST_TYPE)(sym->st_info) == STT_FUNC && - sym->st_shndx == SHN_UNDEF) { - put_got_entry(s1, R_JMP_SLOT, sym->st_size, - sym->st_info, - sym - (ElfW(Sym) *)symtab_section->data); - } - else if (ELFW(ST_TYPE)(sym->st_info) == STT_OBJECT) { - put_got_entry(s1, R_X86_64_GLOB_DAT, sym->st_size, - sym->st_info, - sym - (ElfW(Sym) *)symtab_section->data); - } - else -#endif - { - name = symtab_section->link->data + sym->st_name; - index = put_elf_sym(s1->dynsym, sym->st_value, sym->st_size, - sym->st_info, 0, - sym->st_shndx, name); - s1->symtab_to_dynsym[sym - - (ElfW(Sym) *)symtab_section->data] = - index; - } - } - } - } - - build_got_entries(s1); - - /* add a list of needed dlls */ - for(i = 0; i < s1->nb_loaded_dlls; i++) { - DLLReference *dllref = s1->loaded_dlls[i]; - if (dllref->level == 0) - put_dt(dynamic, DT_NEEDED, put_elf_str(dynstr, dllref->name)); - } - /* XXX: currently, since we do not handle PIC code, we - must relocate the readonly segments */ - if (file_type == TCC_OUTPUT_DLL) { - if (s1->soname) - put_dt(dynamic, DT_SONAME, put_elf_str(dynstr, s1->soname)); - put_dt(dynamic, DT_TEXTREL, 0); - } - - /* add necessary space for other entries */ - saved_dynamic_data_offset = dynamic->data_offset; - dynamic->data_offset += sizeof(ElfW(Dyn)) * 9; - } else { - /* still need to build got entries in case of static link */ - build_got_entries(s1); - } - } - - memset(&ehdr, 0, sizeof(ehdr)); - - /* we add a section for symbols */ - strsec = new_section(s1, ".shstrtab", SHT_STRTAB, 0); - put_elf_str(strsec, ""); - - /* compute number of sections */ - shnum = s1->nb_sections; - - /* this array is used to reorder sections in the output file */ - section_order = tcc_malloc(sizeof(int) * shnum); - section_order[0] = 0; - sh_order_index = 1; - - /* compute number of program headers */ - switch(file_type) { - default: - case TCC_OUTPUT_OBJ: - phnum = 0; - break; - case TCC_OUTPUT_EXE: - if (!s1->static_link) - phnum = 4; - else - phnum = 2; - break; - case TCC_OUTPUT_DLL: - phnum = 3; - break; - } - - /* allocate strings for section names and decide if an unallocated - section should be output */ - /* NOTE: the strsec section comes last, so its size is also - correct ! */ - for(i = 1; i < s1->nb_sections; i++) { - s = s1->sections[i]; - s->sh_name = put_elf_str(strsec, s->name); -#if 0 //gr - printf("section: f=%08x t=%08x i=%08x %s %s\n", - s->sh_flags, - s->sh_type, - s->sh_info, - s->name, - s->reloc ? s->reloc->name : "n" - ); -#endif - /* when generating a DLL, we include relocations but we may - patch them */ - if (file_type == TCC_OUTPUT_DLL && - s->sh_type == SHT_RELX && - !(s->sh_flags & SHF_ALLOC)) { - /* //gr: avoid bogus relocs for empty (debug) sections */ - if (s1->sections[s->sh_info]->sh_flags & SHF_ALLOC) - prepare_dynamic_rel(s1, s); - else if (s1->do_debug) - s->sh_size = s->data_offset; - } else if (s1->do_debug || - file_type == TCC_OUTPUT_OBJ || - (s->sh_flags & SHF_ALLOC) || - i == (s1->nb_sections - 1)) { - /* we output all sections if debug or object file */ - s->sh_size = s->data_offset; - } - } - - /* allocate program segment headers */ - phdr = tcc_mallocz(phnum * sizeof(ElfW(Phdr))); - - if (s1->output_format == TCC_OUTPUT_FORMAT_ELF) { - file_offset = sizeof(ElfW(Ehdr)) + phnum * sizeof(ElfW(Phdr)); - } else { - file_offset = 0; - } - if (phnum > 0) { - /* compute section to program header mapping */ - if (s1->has_text_addr) { - int a_offset, p_offset; - addr = s1->text_addr; - /* we ensure that (addr % ELF_PAGE_SIZE) == file_offset % - ELF_PAGE_SIZE */ - a_offset = addr & (ELF_PAGE_SIZE - 1); - p_offset = file_offset & (ELF_PAGE_SIZE - 1); - if (a_offset < p_offset) - a_offset += ELF_PAGE_SIZE; - file_offset += (a_offset - p_offset); - } else { - if (file_type == TCC_OUTPUT_DLL) - addr = 0; - else - addr = ELF_START_ADDR; - /* compute address after headers */ - addr += (file_offset & (ELF_PAGE_SIZE - 1)); - } - - /* dynamic relocation table information, for .dynamic section */ - rel_size = 0; - rel_addr = 0; - - /* leave one program header for the program interpreter */ - ph = &phdr[0]; - if (interp) - ph++; - - for(j = 0; j < 2; j++) { - ph->p_type = PT_LOAD; - if (j == 0) - ph->p_flags = PF_R | PF_X; - else - ph->p_flags = PF_R | PF_W; - ph->p_align = ELF_PAGE_SIZE; - - /* we do the following ordering: interp, symbol tables, - relocations, progbits, nobits */ - /* XXX: do faster and simpler sorting */ - for(k = 0; k < 5; k++) { - for(i = 1; i < s1->nb_sections; i++) { - s = s1->sections[i]; - /* compute if section should be included */ - if (j == 0) { - if ((s->sh_flags & (SHF_ALLOC | SHF_WRITE)) != - SHF_ALLOC) - continue; - } else { - if ((s->sh_flags & (SHF_ALLOC | SHF_WRITE)) != - (SHF_ALLOC | SHF_WRITE)) - continue; - } - if (s == interp) { - if (k != 0) - continue; - } else if (s->sh_type == SHT_DYNSYM || - s->sh_type == SHT_STRTAB || - s->sh_type == SHT_HASH) { - if (k != 1) - continue; - } else if (s->sh_type == SHT_RELX) { - if (k != 2) - continue; - } else if (s->sh_type == SHT_NOBITS) { - if (k != 4) - continue; - } else { - if (k != 3) - continue; - } - section_order[sh_order_index++] = i; - - /* section matches: we align it and add its size */ - tmp = addr; - addr = (addr + s->sh_addralign - 1) & - ~(s->sh_addralign - 1); - file_offset += addr - tmp; - s->sh_offset = file_offset; - s->sh_addr = addr; - - /* update program header infos */ - if (ph->p_offset == 0) { - ph->p_offset = file_offset; - ph->p_vaddr = addr; - ph->p_paddr = ph->p_vaddr; - } - /* update dynamic relocation infos */ - if (s->sh_type == SHT_RELX) { - if (rel_size == 0) - rel_addr = addr; - rel_size += s->sh_size; - } - addr += s->sh_size; - if (s->sh_type != SHT_NOBITS) - file_offset += s->sh_size; - } - } - ph->p_filesz = file_offset - ph->p_offset; - ph->p_memsz = addr - ph->p_vaddr; - ph++; - if (j == 0) { - if (s1->output_format == TCC_OUTPUT_FORMAT_ELF) { - /* if in the middle of a page, we duplicate the page in - memory so that one copy is RX and the other is RW */ - if ((addr & (ELF_PAGE_SIZE - 1)) != 0) - addr += ELF_PAGE_SIZE; - } else { - addr = (addr + ELF_PAGE_SIZE - 1) & ~(ELF_PAGE_SIZE - 1); - file_offset = (file_offset + ELF_PAGE_SIZE - 1) & - ~(ELF_PAGE_SIZE - 1); - } - } - } - - /* if interpreter, then add corresponing program header */ - if (interp) { - ph = &phdr[0]; - - ph->p_type = PT_INTERP; - ph->p_offset = interp->sh_offset; - ph->p_vaddr = interp->sh_addr; - ph->p_paddr = ph->p_vaddr; - ph->p_filesz = interp->sh_size; - ph->p_memsz = interp->sh_size; - ph->p_flags = PF_R; - ph->p_align = interp->sh_addralign; - } - - /* if dynamic section, then add corresponing program header */ - if (dynamic) { - ElfW(Sym) *sym_end; - - ph = &phdr[phnum - 1]; - - ph->p_type = PT_DYNAMIC; - ph->p_offset = dynamic->sh_offset; - ph->p_vaddr = dynamic->sh_addr; - ph->p_paddr = ph->p_vaddr; - ph->p_filesz = dynamic->sh_size; - ph->p_memsz = dynamic->sh_size; - ph->p_flags = PF_R | PF_W; - ph->p_align = dynamic->sh_addralign; - - /* put GOT dynamic section address */ - put32(s1->got->data, dynamic->sh_addr); - - /* relocate the PLT */ - if (file_type == TCC_OUTPUT_EXE -#if defined(TCC_OUTPUT_DLL_WITH_PLT) - || file_type == TCC_OUTPUT_DLL -#endif - ) { - uint8_t *p, *p_end; - - p = s1->plt->data; - p_end = p + s1->plt->data_offset; - if (p < p_end) { -#if defined(TCC_TARGET_I386) - put32(p + 2, get32(p + 2) + s1->got->sh_addr); - put32(p + 8, get32(p + 8) + s1->got->sh_addr); - p += 16; - while (p < p_end) { - put32(p + 2, get32(p + 2) + s1->got->sh_addr); - p += 16; - } -#elif defined(TCC_TARGET_X86_64) - int x = s1->got->sh_addr - s1->plt->sh_addr - 6; - put32(p + 2, get32(p + 2) + x); - put32(p + 8, get32(p + 8) + x - 6); - p += 16; - while (p < p_end) { - put32(p + 2, get32(p + 2) + x + s1->plt->data - p); - p += 16; - } -#elif defined(TCC_TARGET_ARM) - int x; - x=s1->got->sh_addr - s1->plt->sh_addr - 12; - p +=16; - while (p < p_end) { - put32(p + 12, x + get32(p + 12) + s1->plt->data - p); - p += 16; - } -#elif defined(TCC_TARGET_C67) - /* XXX: TODO */ -#else -#error unsupported CPU -#endif - } - } - - /* relocate symbols in .dynsym */ - sym_end = (ElfW(Sym) *)(s1->dynsym->data + s1->dynsym->data_offset); - for(sym = (ElfW(Sym) *)s1->dynsym->data + 1; - sym < sym_end; - sym++) { - if (sym->st_shndx == SHN_UNDEF) { - /* relocate to the PLT if the symbol corresponds - to a PLT entry */ - if (sym->st_value) - sym->st_value += s1->plt->sh_addr; - } else if (sym->st_shndx < SHN_LORESERVE) { - /* do symbol relocation */ - sym->st_value += s1->sections[sym->st_shndx]->sh_addr; - } - } - - /* put dynamic section entries */ - dynamic->data_offset = saved_dynamic_data_offset; - put_dt(dynamic, DT_HASH, s1->dynsym->hash->sh_addr); - put_dt(dynamic, DT_STRTAB, dynstr->sh_addr); - put_dt(dynamic, DT_SYMTAB, s1->dynsym->sh_addr); - put_dt(dynamic, DT_STRSZ, dynstr->data_offset); - put_dt(dynamic, DT_SYMENT, sizeof(ElfW(Sym))); -#ifdef TCC_TARGET_X86_64 - put_dt(dynamic, DT_RELA, rel_addr); - put_dt(dynamic, DT_RELASZ, rel_size); - put_dt(dynamic, DT_RELAENT, sizeof(ElfW_Rel)); -#else - put_dt(dynamic, DT_REL, rel_addr); - put_dt(dynamic, DT_RELSZ, rel_size); - put_dt(dynamic, DT_RELENT, sizeof(ElfW_Rel)); -#endif - if (s1->do_debug) - put_dt(dynamic, DT_DEBUG, 0); - put_dt(dynamic, DT_NULL, 0); - } - - ehdr.e_phentsize = sizeof(ElfW(Phdr)); - ehdr.e_phnum = phnum; - ehdr.e_phoff = sizeof(ElfW(Ehdr)); - } - - /* all other sections come after */ - for(i = 1; i < s1->nb_sections; i++) { - s = s1->sections[i]; - if (phnum > 0 && (s->sh_flags & SHF_ALLOC)) - continue; - section_order[sh_order_index++] = i; - - file_offset = (file_offset + s->sh_addralign - 1) & - ~(s->sh_addralign - 1); - s->sh_offset = file_offset; - if (s->sh_type != SHT_NOBITS) - file_offset += s->sh_size; - } - - /* if building executable or DLL, then relocate each section - except the GOT which is already relocated */ - if (file_type != TCC_OUTPUT_OBJ) { - relocate_syms(s1, 0); - - if (s1->nb_errors != 0) { - fail: - ret = -1; - goto the_end; - } - - /* relocate sections */ - /* XXX: ignore sections with allocated relocations ? */ - for(i = 1; i < s1->nb_sections; i++) { - s = s1->sections[i]; - if (s->reloc && s != s1->got && (s->sh_flags & SHF_ALLOC)) //gr - relocate_section(s1, s); - } - - /* relocate relocation entries if the relocation tables are - allocated in the executable */ - for(i = 1; i < s1->nb_sections; i++) { - s = s1->sections[i]; - if ((s->sh_flags & SHF_ALLOC) && - s->sh_type == SHT_RELX) { - relocate_rel(s1, s); - } - } - - /* get entry point address */ - if (file_type == TCC_OUTPUT_EXE) - ehdr.e_entry = (unsigned long)tcc_get_symbol_err(s1, "_start"); - else - ehdr.e_entry = text_section->sh_addr; /* XXX: is it correct ? */ - } - - /* write elf file */ - if (file_type == TCC_OUTPUT_OBJ) - mode = 0666; - else - mode = 0777; - fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, mode); - if (fd < 0) { - error_noabort("could not write '%s'", filename); - goto fail; - } - f = fdopen(fd, "wb"); - if (s1->verbose) - printf("<- %s\n", filename); - -#ifdef TCC_TARGET_COFF - if (s1->output_format == TCC_OUTPUT_FORMAT_COFF) { - tcc_output_coff(s1, f); - } else -#endif - if (s1->output_format == TCC_OUTPUT_FORMAT_ELF) { - sort_syms(s1, symtab_section); - - /* align to 4 */ - file_offset = (file_offset + 3) & -4; - - /* fill header */ - ehdr.e_ident[0] = ELFMAG0; - ehdr.e_ident[1] = ELFMAG1; - ehdr.e_ident[2] = ELFMAG2; - ehdr.e_ident[3] = ELFMAG3; - ehdr.e_ident[4] = TCC_ELFCLASS; - ehdr.e_ident[5] = ELFDATA2LSB; - ehdr.e_ident[6] = EV_CURRENT; -#ifdef __FreeBSD__ - ehdr.e_ident[EI_OSABI] = ELFOSABI_FREEBSD; -#endif -#ifdef TCC_TARGET_ARM -#ifdef TCC_ARM_EABI - ehdr.e_ident[EI_OSABI] = 0; - ehdr.e_flags = 4 << 24; -#else - ehdr.e_ident[EI_OSABI] = ELFOSABI_ARM; -#endif -#endif - switch(file_type) { - default: - case TCC_OUTPUT_EXE: - ehdr.e_type = ET_EXEC; - break; - case TCC_OUTPUT_DLL: - ehdr.e_type = ET_DYN; - break; - case TCC_OUTPUT_OBJ: - ehdr.e_type = ET_REL; - break; - } - ehdr.e_machine = EM_TCC_TARGET; - ehdr.e_version = EV_CURRENT; - ehdr.e_shoff = file_offset; - ehdr.e_ehsize = sizeof(ElfW(Ehdr)); - ehdr.e_shentsize = sizeof(ElfW(Shdr)); - ehdr.e_shnum = shnum; - ehdr.e_shstrndx = shnum - 1; - - fwrite(&ehdr, 1, sizeof(ElfW(Ehdr)), f); - fwrite(phdr, 1, phnum * sizeof(ElfW(Phdr)), f); - offset = sizeof(ElfW(Ehdr)) + phnum * sizeof(ElfW(Phdr)); - - for(i=1;i<s1->nb_sections;i++) { - s = s1->sections[section_order[i]]; - if (s->sh_type != SHT_NOBITS) { - while (offset < s->sh_offset) { - fputc(0, f); - offset++; - } - size = s->sh_size; - fwrite(s->data, 1, size, f); - offset += size; - } - } - - /* output section headers */ - while (offset < ehdr.e_shoff) { - fputc(0, f); - offset++; - } - - for(i=0;i<s1->nb_sections;i++) { - sh = &shdr; - memset(sh, 0, sizeof(ElfW(Shdr))); - s = s1->sections[i]; - if (s) { - sh->sh_name = s->sh_name; - sh->sh_type = s->sh_type; - sh->sh_flags = s->sh_flags; - sh->sh_entsize = s->sh_entsize; - sh->sh_info = s->sh_info; - if (s->link) - sh->sh_link = s->link->sh_num; - sh->sh_addralign = s->sh_addralign; - sh->sh_addr = s->sh_addr; - sh->sh_offset = s->sh_offset; - sh->sh_size = s->sh_size; - } - fwrite(sh, 1, sizeof(ElfW(Shdr)), f); - } - } else { - tcc_output_binary(s1, f, section_order); - } - fclose(f); - - ret = 0; - the_end: - tcc_free(s1->symtab_to_dynsym); - tcc_free(section_order); - tcc_free(phdr); - tcc_free(s1->got_offsets); - return ret; -} - -int tcc_output_file(TCCState *s, const char *filename) -{ - int ret; -#ifdef TCC_TARGET_PE - if (s->output_type != TCC_OUTPUT_OBJ) { - ret = pe_output_file(s, filename); - } else -#endif - { - ret = elf_output_file(s, filename); - } - return ret; -} - -static void *load_data(int fd, unsigned long file_offset, unsigned long size) -{ - void *data; - - data = tcc_malloc(size); - lseek(fd, file_offset, SEEK_SET); - read(fd, data, size); - return data; -} - -typedef struct SectionMergeInfo { - Section *s; /* corresponding existing section */ - unsigned long offset; /* offset of the new section in the existing section */ - uint8_t new_section; /* true if section 's' was added */ - uint8_t link_once; /* true if link once section */ -} SectionMergeInfo; - -/* load an object file and merge it with current files */ -/* XXX: handle correctly stab (debug) info */ -static int tcc_load_object_file(TCCState *s1, - int fd, unsigned long file_offset) -{ - ElfW(Ehdr) ehdr; - ElfW(Shdr) *shdr, *sh; - int size, i, j, offset, offseti, nb_syms, sym_index, ret; - unsigned char *strsec, *strtab; - int *old_to_new_syms; - char *sh_name, *name; - SectionMergeInfo *sm_table, *sm; - ElfW(Sym) *sym, *symtab; - ElfW_Rel *rel, *rel_end; - Section *s; - - int stab_index; - int stabstr_index; - - stab_index = stabstr_index = 0; - - if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr)) - goto fail1; - if (ehdr.e_ident[0] != ELFMAG0 || - ehdr.e_ident[1] != ELFMAG1 || - ehdr.e_ident[2] != ELFMAG2 || - ehdr.e_ident[3] != ELFMAG3) - goto fail1; - /* test if object file */ - if (ehdr.e_type != ET_REL) - goto fail1; - /* test CPU specific stuff */ - if (ehdr.e_ident[5] != ELFDATA2LSB || - ehdr.e_machine != EM_TCC_TARGET) { - fail1: - error_noabort("invalid object file"); - return -1; - } - /* read sections */ - shdr = load_data(fd, file_offset + ehdr.e_shoff, - sizeof(ElfW(Shdr)) * ehdr.e_shnum); - sm_table = tcc_mallocz(sizeof(SectionMergeInfo) * ehdr.e_shnum); - - /* load section names */ - sh = &shdr[ehdr.e_shstrndx]; - strsec = load_data(fd, file_offset + sh->sh_offset, sh->sh_size); - - /* load symtab and strtab */ - old_to_new_syms = NULL; - symtab = NULL; - strtab = NULL; - nb_syms = 0; - for(i = 1; i < ehdr.e_shnum; i++) { - sh = &shdr[i]; - if (sh->sh_type == SHT_SYMTAB) { - if (symtab) { - error_noabort("object must contain only one symtab"); - fail: - ret = -1; - goto the_end; - } - nb_syms = sh->sh_size / sizeof(ElfW(Sym)); - symtab = load_data(fd, file_offset + sh->sh_offset, sh->sh_size); - sm_table[i].s = symtab_section; - - /* now load strtab */ - sh = &shdr[sh->sh_link]; - strtab = load_data(fd, file_offset + sh->sh_offset, sh->sh_size); - } - } - - /* now examine each section and try to merge its content with the - ones in memory */ - for(i = 1; i < ehdr.e_shnum; i++) { - /* no need to examine section name strtab */ - if (i == ehdr.e_shstrndx) - continue; - sh = &shdr[i]; - sh_name = strsec + sh->sh_name; - /* ignore sections types we do not handle */ - if (sh->sh_type != SHT_PROGBITS && - sh->sh_type != SHT_RELX && -#ifdef TCC_ARM_EABI - sh->sh_type != SHT_ARM_EXIDX && -#endif - sh->sh_type != SHT_NOBITS && - strcmp(sh_name, ".stabstr") - ) - continue; - if (sh->sh_addralign < 1) - sh->sh_addralign = 1; - /* find corresponding section, if any */ - for(j = 1; j < s1->nb_sections;j++) { - s = s1->sections[j]; - if (!strcmp(s->name, sh_name)) { - if (!strncmp(sh_name, ".gnu.linkonce", - sizeof(".gnu.linkonce") - 1)) { - /* if a 'linkonce' section is already present, we - do not add it again. It is a little tricky as - symbols can still be defined in - it. */ - sm_table[i].link_once = 1; - goto next; - } else { - goto found; - } - } - } - /* not found: create new section */ - s = new_section(s1, sh_name, sh->sh_type, sh->sh_flags); - /* take as much info as possible from the section. sh_link and - sh_info will be updated later */ - s->sh_addralign = sh->sh_addralign; - s->sh_entsize = sh->sh_entsize; - sm_table[i].new_section = 1; - found: - if (sh->sh_type != s->sh_type) { - error_noabort("invalid section type"); - goto fail; - } - - /* align start of section */ - offset = s->data_offset; - - if (0 == strcmp(sh_name, ".stab")) { - stab_index = i; - goto no_align; - } - if (0 == strcmp(sh_name, ".stabstr")) { - stabstr_index = i; - goto no_align; - } - - size = sh->sh_addralign - 1; - offset = (offset + size) & ~size; - if (sh->sh_addralign > s->sh_addralign) - s->sh_addralign = sh->sh_addralign; - s->data_offset = offset; - no_align: - sm_table[i].offset = offset; - sm_table[i].s = s; - /* concatenate sections */ - size = sh->sh_size; - if (sh->sh_type != SHT_NOBITS) { - unsigned char *ptr; - lseek(fd, file_offset + sh->sh_offset, SEEK_SET); - ptr = section_ptr_add(s, size); - read(fd, ptr, size); - } else { - s->data_offset += size; - } - next: ; - } - - /* //gr relocate stab strings */ - if (stab_index && stabstr_index) { - Stab_Sym *a, *b; - unsigned o; - s = sm_table[stab_index].s; - a = (Stab_Sym *)(s->data + sm_table[stab_index].offset); - b = (Stab_Sym *)(s->data + s->data_offset); - o = sm_table[stabstr_index].offset; - while (a < b) - a->n_strx += o, a++; - } - - /* second short pass to update sh_link and sh_info fields of new - sections */ - for(i = 1; i < ehdr.e_shnum; i++) { - s = sm_table[i].s; - if (!s || !sm_table[i].new_section) - continue; - sh = &shdr[i]; - if (sh->sh_link > 0) - s->link = sm_table[sh->sh_link].s; - if (sh->sh_type == SHT_RELX) { - s->sh_info = sm_table[sh->sh_info].s->sh_num; - /* update backward link */ - s1->sections[s->sh_info]->reloc = s; - } - } - sm = sm_table; - - /* resolve symbols */ - old_to_new_syms = tcc_mallocz(nb_syms * sizeof(int)); - - sym = symtab + 1; - for(i = 1; i < nb_syms; i++, sym++) { - if (sym->st_shndx != SHN_UNDEF && - sym->st_shndx < SHN_LORESERVE) { - sm = &sm_table[sym->st_shndx]; - if (sm->link_once) { - /* if a symbol is in a link once section, we use the - already defined symbol. It is very important to get - correct relocations */ - if (ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) { - name = strtab + sym->st_name; - sym_index = find_elf_sym(symtab_section, name); - if (sym_index) - old_to_new_syms[i] = sym_index; - } - continue; - } - /* if no corresponding section added, no need to add symbol */ - if (!sm->s) - continue; - /* convert section number */ - sym->st_shndx = sm->s->sh_num; - /* offset value */ - sym->st_value += sm->offset; - } - /* add symbol */ - name = strtab + sym->st_name; - sym_index = add_elf_sym(symtab_section, sym->st_value, sym->st_size, - sym->st_info, sym->st_other, - sym->st_shndx, name); - old_to_new_syms[i] = sym_index; - } - - /* third pass to patch relocation entries */ - for(i = 1; i < ehdr.e_shnum; i++) { - s = sm_table[i].s; - if (!s) - continue; - sh = &shdr[i]; - offset = sm_table[i].offset; - switch(s->sh_type) { - case SHT_RELX: - /* take relocation offset information */ - offseti = sm_table[sh->sh_info].offset; - rel_end = (ElfW_Rel *)(s->data + s->data_offset); - for(rel = (ElfW_Rel *)(s->data + offset); - rel < rel_end; - rel++) { - int type; - unsigned sym_index; - /* convert symbol index */ - type = ELFW(R_TYPE)(rel->r_info); - sym_index = ELFW(R_SYM)(rel->r_info); - /* NOTE: only one symtab assumed */ - if (sym_index >= nb_syms) - goto invalid_reloc; - sym_index = old_to_new_syms[sym_index]; - /* ignore link_once in rel section. */ - if (!sym_index && !sm->link_once) { - invalid_reloc: - error_noabort("Invalid relocation entry [%2d] '%s' @ %.8x", - i, strsec + sh->sh_name, rel->r_offset); - goto fail; - } - rel->r_info = ELFW(R_INFO)(sym_index, type); - /* offset the relocation offset */ - rel->r_offset += offseti; - } - break; - default: - break; - } - } - - ret = 0; - the_end: - tcc_free(symtab); - tcc_free(strtab); - tcc_free(old_to_new_syms); - tcc_free(sm_table); - tcc_free(strsec); - tcc_free(shdr); - return ret; -} - -#define ARMAG "!<arch>\012" /* For COFF and a.out archives */ - -typedef struct ArchiveHeader { - char ar_name[16]; /* name of this member */ - char ar_date[12]; /* file mtime */ - char ar_uid[6]; /* owner uid; printed as decimal */ - char ar_gid[6]; /* owner gid; printed as decimal */ - char ar_mode[8]; /* file mode, printed as octal */ - char ar_size[10]; /* file size, printed as decimal */ - char ar_fmag[2]; /* should contain ARFMAG */ -} ArchiveHeader; - -static int get_be32(const uint8_t *b) -{ - return b[3] | (b[2] << 8) | (b[1] << 16) | (b[0] << 24); -} - -/* load only the objects which resolve undefined symbols */ -static int tcc_load_alacarte(TCCState *s1, int fd, int size) -{ - int i, bound, nsyms, sym_index, off, ret; - uint8_t *data; - const char *ar_names, *p; - const uint8_t *ar_index; - ElfW(Sym) *sym; - - data = tcc_malloc(size); - if (read(fd, data, size) != size) - goto fail; - nsyms = get_be32(data); - ar_index = data + 4; - ar_names = ar_index + nsyms * 4; - - do { - bound = 0; - for(p = ar_names, i = 0; i < nsyms; i++, p += strlen(p)+1) { - sym_index = find_elf_sym(symtab_section, p); - if(sym_index) { - sym = &((ElfW(Sym) *)symtab_section->data)[sym_index]; - if(sym->st_shndx == SHN_UNDEF) { - off = get_be32(ar_index + i * 4) + sizeof(ArchiveHeader); -#if 0 - printf("%5d\t%s\t%08x\n", i, p, sym->st_shndx); -#endif - ++bound; - lseek(fd, off, SEEK_SET); - if(tcc_load_object_file(s1, fd, off) < 0) { - fail: - ret = -1; - goto the_end; - } - } - } - } - } while(bound); - ret = 0; - the_end: - tcc_free(data); - return ret; -} - -/* load a '.a' file */ -static int tcc_load_archive(TCCState *s1, int fd) -{ - ArchiveHeader hdr; - char ar_size[11]; - char ar_name[17]; - char magic[8]; - int size, len, i; - unsigned long file_offset; - - /* skip magic which was already checked */ - read(fd, magic, sizeof(magic)); - - for(;;) { - len = read(fd, &hdr, sizeof(hdr)); - if (len == 0) - break; - if (len != sizeof(hdr)) { - error_noabort("invalid archive"); - return -1; - } - memcpy(ar_size, hdr.ar_size, sizeof(hdr.ar_size)); - ar_size[sizeof(hdr.ar_size)] = '\0'; - size = strtol(ar_size, NULL, 0); - memcpy(ar_name, hdr.ar_name, sizeof(hdr.ar_name)); - for(i = sizeof(hdr.ar_name) - 1; i >= 0; i--) { - if (ar_name[i] != ' ') - break; - } - ar_name[i + 1] = '\0'; - // printf("name='%s' size=%d %s\n", ar_name, size, ar_size); - file_offset = lseek(fd, 0, SEEK_CUR); - /* align to even */ - size = (size + 1) & ~1; - if (!strcmp(ar_name, "/")) { - /* coff symbol table : we handle it */ - if(s1->alacarte_link) - return tcc_load_alacarte(s1, fd, size); - } else if (!strcmp(ar_name, "//") || - !strcmp(ar_name, "__.SYMDEF") || - !strcmp(ar_name, "__.SYMDEF/") || - !strcmp(ar_name, "ARFILENAMES/")) { - /* skip symbol table or archive names */ - } else { - if (tcc_load_object_file(s1, fd, file_offset) < 0) - return -1; - } - lseek(fd, file_offset + size, SEEK_SET); - } - return 0; -} - -/* load a DLL and all referenced DLLs. 'level = 0' means that the DLL - is referenced by the user (so it should be added as DT_NEEDED in - the generated ELF file) */ -static int tcc_load_dll(TCCState *s1, int fd, const char *filename, int level) -{ - ElfW(Ehdr) ehdr; - ElfW(Shdr) *shdr, *sh, *sh1; - int i, j, nb_syms, nb_dts, sym_bind, ret; - ElfW(Sym) *sym, *dynsym; - ElfW(Dyn) *dt, *dynamic; - unsigned char *dynstr; - const char *name, *soname; - DLLReference *dllref; - - read(fd, &ehdr, sizeof(ehdr)); - - /* test CPU specific stuff */ - if (ehdr.e_ident[5] != ELFDATA2LSB || - ehdr.e_machine != EM_TCC_TARGET) { - error_noabort("bad architecture"); - return -1; - } - - /* read sections */ - shdr = load_data(fd, ehdr.e_shoff, sizeof(ElfW(Shdr)) * ehdr.e_shnum); - - /* load dynamic section and dynamic symbols */ - nb_syms = 0; - nb_dts = 0; - dynamic = NULL; - dynsym = NULL; /* avoid warning */ - dynstr = NULL; /* avoid warning */ - for(i = 0, sh = shdr; i < ehdr.e_shnum; i++, sh++) { - switch(sh->sh_type) { - case SHT_DYNAMIC: - nb_dts = sh->sh_size / sizeof(ElfW(Dyn)); - dynamic = load_data(fd, sh->sh_offset, sh->sh_size); - break; - case SHT_DYNSYM: - nb_syms = sh->sh_size / sizeof(ElfW(Sym)); - dynsym = load_data(fd, sh->sh_offset, sh->sh_size); - sh1 = &shdr[sh->sh_link]; - dynstr = load_data(fd, sh1->sh_offset, sh1->sh_size); - break; - default: - break; - } - } - - /* compute the real library name */ - soname = tcc_basename(filename); - - for(i = 0, dt = dynamic; i < nb_dts; i++, dt++) { - if (dt->d_tag == DT_SONAME) { - soname = dynstr + dt->d_un.d_val; - } - } - - /* if the dll is already loaded, do not load it */ - for(i = 0; i < s1->nb_loaded_dlls; i++) { - dllref = s1->loaded_dlls[i]; - if (!strcmp(soname, dllref->name)) { - /* but update level if needed */ - if (level < dllref->level) - dllref->level = level; - ret = 0; - goto the_end; - } - } - - // printf("loading dll '%s'\n", soname); - - /* add the dll and its level */ - dllref = tcc_mallocz(sizeof(DLLReference) + strlen(soname)); - dllref->level = level; - strcpy(dllref->name, soname); - dynarray_add((void ***)&s1->loaded_dlls, &s1->nb_loaded_dlls, dllref); - - /* add dynamic symbols in dynsym_section */ - for(i = 1, sym = dynsym + 1; i < nb_syms; i++, sym++) { - sym_bind = ELFW(ST_BIND)(sym->st_info); - if (sym_bind == STB_LOCAL) - continue; - name = dynstr + sym->st_name; - add_elf_sym(s1->dynsymtab_section, sym->st_value, sym->st_size, - sym->st_info, sym->st_other, sym->st_shndx, name); - } - - /* load all referenced DLLs */ - for(i = 0, dt = dynamic; i < nb_dts; i++, dt++) { - switch(dt->d_tag) { - case DT_NEEDED: - name = dynstr + dt->d_un.d_val; - for(j = 0; j < s1->nb_loaded_dlls; j++) { - dllref = s1->loaded_dlls[j]; - if (!strcmp(name, dllref->name)) - goto already_loaded; - } - if (tcc_add_dll(s1, name, AFF_REFERENCED_DLL) < 0) { - error_noabort("referenced dll '%s' not found", name); - ret = -1; - goto the_end; - } - already_loaded: - break; - } - } - ret = 0; - the_end: - tcc_free(dynstr); - tcc_free(dynsym); - tcc_free(dynamic); - tcc_free(shdr); - return ret; -} - -#define LD_TOK_NAME 256 -#define LD_TOK_EOF (-1) - -/* return next ld script token */ -static int ld_next(TCCState *s1, char *name, int name_size) -{ - int c; - char *q; - - redo: - switch(ch) { - case ' ': - case '\t': - case '\f': - case '\v': - case '\r': - case '\n': - inp(); - goto redo; - case '/': - minp(); - if (ch == '*') { - file->buf_ptr = parse_comment(file->buf_ptr); - ch = file->buf_ptr[0]; - goto redo; - } else { - q = name; - *q++ = '/'; - goto parse_name; - } - break; - /* case 'a' ... 'z': */ - case 'a': - case 'b': - case 'c': - case 'd': - case 'e': - case 'f': - case 'g': - case 'h': - case 'i': - case 'j': - case 'k': - case 'l': - case 'm': - case 'n': - case 'o': - case 'p': - case 'q': - case 'r': - case 's': - case 't': - case 'u': - case 'v': - case 'w': - case 'x': - case 'y': - case 'z': - /* case 'A' ... 'z': */ - case 'A': - case 'B': - case 'C': - case 'D': - case 'E': - case 'F': - case 'G': - case 'H': - case 'I': - case 'J': - case 'K': - case 'L': - case 'M': - case 'N': - case 'O': - case 'P': - case 'Q': - case 'R': - case 'S': - case 'T': - case 'U': - case 'V': - case 'W': - case 'X': - case 'Y': - case 'Z': - case '_': - case '\\': - case '.': - case '$': - case '~': - q = name; - parse_name: - for(;;) { - if (!((ch >= 'a' && ch <= 'z') || - (ch >= 'A' && ch <= 'Z') || - (ch >= '0' && ch <= '9') || - strchr("/.-_+=$:\\,~", ch))) - break; - if ((q - name) < name_size - 1) { - *q++ = ch; - } - minp(); - } - *q = '\0'; - c = LD_TOK_NAME; - break; - case CH_EOF: - c = LD_TOK_EOF; - break; - default: - c = ch; - inp(); - break; - } -#if 0 - printf("tok=%c %d\n", c, c); - if (c == LD_TOK_NAME) - printf(" name=%s\n", name); -#endif - return c; -} - -static int ld_add_file_list(TCCState *s1, int as_needed) -{ - char filename[1024]; - int t, ret; - - t = ld_next(s1, filename, sizeof(filename)); - if (t != '(') - expect("("); - t = ld_next(s1, filename, sizeof(filename)); - for(;;) { - if (t == LD_TOK_EOF) { - error_noabort("unexpected end of file"); - return -1; - } else if (t == ')') { - break; - } else if (t != LD_TOK_NAME) { - error_noabort("filename expected"); - return -1; - } - if (!strcmp(filename, "AS_NEEDED")) { - ret = ld_add_file_list(s1, 1); - if (ret) - return ret; - } else { - /* TODO: Implement AS_NEEDED support. Ignore it for now */ - if (!as_needed) - tcc_add_file(s1, filename); - } - t = ld_next(s1, filename, sizeof(filename)); - if (t == ',') { - t = ld_next(s1, filename, sizeof(filename)); - } - } - return 0; -} - -/* interpret a subset of GNU ldscripts to handle the dummy libc.so - files */ -static int tcc_load_ldscript(TCCState *s1) -{ - char cmd[64]; - char filename[1024]; - int t, ret; - - ch = file->buf_ptr[0]; - ch = handle_eob(); - for(;;) { - t = ld_next(s1, cmd, sizeof(cmd)); - if (t == LD_TOK_EOF) - return 0; - else if (t != LD_TOK_NAME) - return -1; - if (!strcmp(cmd, "INPUT") || - !strcmp(cmd, "GROUP")) { - ret = ld_add_file_list(s1, 0); - if (ret) - return ret; - } else if (!strcmp(cmd, "OUTPUT_FORMAT") || - !strcmp(cmd, "TARGET")) { - /* ignore some commands */ - t = ld_next(s1, cmd, sizeof(cmd)); - if (t != '(') - expect("("); - for(;;) { - t = ld_next(s1, filename, sizeof(filename)); - if (t == LD_TOK_EOF) { - error_noabort("unexpected end of file"); - return -1; - } else if (t == ')') { - break; - } - } - } else { - return -1; - } - } - return 0; -} |