diff options
Diffstat (limited to 'tinyc/tccelf.c')
| -rw-r--r-- | tinyc/tccelf.c | 2994 |
1 files changed, 0 insertions, 2994 deletions
diff --git a/tinyc/tccelf.c b/tinyc/tccelf.c deleted file mode 100644 index 22ce5df9c..000000000 --- a/tinyc/tccelf.c +++ /dev/null @@ -1,2994 +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 - */ - -#include "tcc.h" - -/* Define this to get some debug output during relocation processing. */ -#undef DEBUG_RELOC - -/********************************************************/ -/* global variables */ - -ST_DATA Section *text_section, *data_section, *bss_section; /* predefined sections */ -ST_DATA Section *common_section; -ST_DATA Section *cur_text_section; /* current section where function code is generated */ -#ifdef CONFIG_TCC_ASM -ST_DATA Section *last_text_section; /* to handle .previous asm directive */ -#endif -#ifdef CONFIG_TCC_BCHECK -/* bound check related sections */ -ST_DATA Section *bounds_section; /* contains global data bound description */ -ST_DATA Section *lbounds_section; /* contains local data bound description */ -#endif -/* symbol sections */ -ST_DATA Section *symtab_section, *strtab_section; -/* debug sections */ -ST_DATA Section *stab_section, *stabstr_section; - -/* XXX: avoid static variable */ -static int new_undef_sym = 0; /* Is there a new undefined sym since last new_undef_sym() */ - -/* ------------------------------------------------------------------------- */ - -ST_FUNC void tccelf_new(TCCState *s) -{ - /* no section zero */ - dynarray_add(&s->sections, &s->nb_sections, NULL); - - /* create standard sections */ - text_section = new_section(s, ".text", SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR); - data_section = new_section(s, ".data", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE); - bss_section = new_section(s, ".bss", SHT_NOBITS, SHF_ALLOC | SHF_WRITE); - common_section = new_section(s, ".common", SHT_NOBITS, SHF_PRIVATE); - common_section->sh_num = SHN_COMMON; - - /* symbols are always generated for linking stage */ - symtab_section = new_symtab(s, ".symtab", SHT_SYMTAB, 0, - ".strtab", - ".hashtab", SHF_PRIVATE); - strtab_section = symtab_section->link; - s->symtab = symtab_section; - - /* private symbol table for dynamic symbols */ - s->dynsymtab_section = new_symtab(s, ".dynsymtab", SHT_SYMTAB, SHF_PRIVATE, - ".dynstrtab", - ".dynhashtab", SHF_PRIVATE); - get_sym_attr(s, 0, 1); -} - -#ifdef CONFIG_TCC_BCHECK -ST_FUNC void tccelf_bounds_new(TCCState *s) -{ - /* create bounds sections */ - bounds_section = new_section(s, ".bounds", - SHT_PROGBITS, SHF_ALLOC); - lbounds_section = new_section(s, ".lbounds", - SHT_PROGBITS, SHF_ALLOC); -} -#endif - -ST_FUNC void tccelf_stab_new(TCCState *s) -{ - stab_section = new_section(s, ".stab", SHT_PROGBITS, 0); - stab_section->sh_entsize = sizeof(Stab_Sym); - stabstr_section = new_section(s, ".stabstr", SHT_STRTAB, 0); - put_elf_str(stabstr_section, ""); - stab_section->link = stabstr_section; - /* put first entry */ - put_stabs("", 0, 0, 0, 0); -} - -static void free_section(Section *s) -{ - tcc_free(s->data); -} - -ST_FUNC void tccelf_delete(TCCState *s1) -{ - int i; - - /* free all sections */ - for(i = 1; i < s1->nb_sections; i++) - free_section(s1->sections[i]); - dynarray_reset(&s1->sections, &s1->nb_sections); - - for(i = 0; i < s1->nb_priv_sections; i++) - free_section(s1->priv_sections[i]); - dynarray_reset(&s1->priv_sections, &s1->nb_priv_sections); - - /* free any loaded DLLs */ -#ifdef TCC_IS_NATIVE - for ( i = 0; i < s1->nb_loaded_dlls; i++) { - DLLReference *ref = s1->loaded_dlls[i]; - if ( ref->handle ) -# ifdef _WIN32 - FreeLibrary((HMODULE)ref->handle); -# else - dlclose(ref->handle); -# endif - } -#endif - /* free loaded dlls array */ - dynarray_reset(&s1->loaded_dlls, &s1->nb_loaded_dlls); - tcc_free(s1->sym_attrs); -} - -ST_FUNC Section *new_section(TCCState *s1, const char *name, int sh_type, int sh_flags) -{ - Section *sec; - - sec = tcc_mallocz(sizeof(Section) + strlen(name)); - strcpy(sec->name, name); - sec->sh_type = sh_type; - sec->sh_flags = sh_flags; - switch(sh_type) { - case SHT_HASH: - case SHT_REL: - case SHT_RELA: - case SHT_DYNSYM: - case SHT_SYMTAB: - case SHT_DYNAMIC: - sec->sh_addralign = 4; - break; - case SHT_STRTAB: - sec->sh_addralign = 1; - break; - default: - sec->sh_addralign = PTR_SIZE; /* gcc/pcc default alignment */ - break; - } - - if (sh_flags & SHF_PRIVATE) { - dynarray_add(&s1->priv_sections, &s1->nb_priv_sections, sec); - } else { - sec->sh_num = s1->nb_sections; - dynarray_add(&s1->sections, &s1->nb_sections, sec); - } - - return sec; -} - -ST_FUNC 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; -} - -/* realloc section and set its content to zero */ -ST_FUNC void section_realloc(Section *sec, unsigned long new_size) -{ - unsigned long size; - unsigned char *data; - - size = sec->data_allocated; - if (size == 0) - size = 1; - while (size < new_size) - size = size * 2; - data = tcc_realloc(sec->data, size); - memset(data + sec->data_allocated, 0, size - sec->data_allocated); - sec->data = data; - sec->data_allocated = size; -} - -/* reserve at least 'size' bytes aligned per 'align' in section - 'sec' from current offset, and return the aligned offset */ -ST_FUNC size_t section_add(Section *sec, addr_t size, int align) -{ - size_t offset, offset1; - - offset = (sec->data_offset + align - 1) & -align; - offset1 = offset + size; - if (sec->sh_type != SHT_NOBITS && offset1 > sec->data_allocated) - section_realloc(sec, offset1); - sec->data_offset = offset1; - if (align > sec->sh_addralign) - sec->sh_addralign = align; - return offset; -} - -/* reserve at least 'size' bytes in section 'sec' from - sec->data_offset. */ -ST_FUNC void *section_ptr_add(Section *sec, addr_t size) -{ - size_t offset = section_add(sec, size, 1); - return sec->data + offset; -} - -/* reserve at least 'size' bytes from section start */ -ST_FUNC void section_reserve(Section *sec, unsigned long size) -{ - if (size > sec->data_allocated) - section_realloc(sec, size); - if (size > sec->data_offset) - sec->data_offset = size; -} - -/* return a reference to a section, and create it if it does not - exists */ -ST_FUNC Section *find_section(TCCState *s1, const char *name) -{ - Section *sec; - int i; - for(i = 1; i < s1->nb_sections; i++) { - sec = s1->sections[i]; - if (!strcmp(name, sec->name)) - return sec; - } - /* sections are created as PROGBITS */ - return new_section(s1, name, SHT_PROGBITS, SHF_ALLOC); -} - -/* ------------------------------------------------------------------------- */ - -ST_FUNC 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; - unsigned 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 */ -ST_FUNC int put_elf_sym(Section *s, addr_t 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((unsigned char *) 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. */ -ST_FUNC 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((unsigned char *) name) % nbuckets; - sym_index = ((int *)hs->data)[2 + h]; - while (sym_index != 0) { - sym = &((ElfW(Sym) *)s->data)[sym_index]; - name1 = (char *) 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, signal error if 'err' is nonzero */ -ST_FUNC addr_t get_elf_sym_addr(TCCState *s, const char *name, int err) -{ - int sym_index; - ElfW(Sym) *sym; - - sym_index = find_elf_sym(s->symtab, name); - sym = &((ElfW(Sym) *)s->symtab->data)[sym_index]; - if (!sym_index || sym->st_shndx == SHN_UNDEF) { - if (err) - tcc_error("%s not defined", name); - return 0; - } - return sym->st_value; -} - -/* return elf symbol value */ -LIBTCCAPI void *tcc_get_symbol(TCCState *s, const char *name) -{ - return (void*)(uintptr_t)get_elf_sym_addr(s, name, 0); -} - -#if defined TCC_IS_NATIVE || defined TCC_TARGET_PE -/* return elf symbol value or error */ -ST_FUNC void* tcc_get_symbol_err(TCCState *s, const char *name) -{ - return (void*)(uintptr_t)get_elf_sym_addr(s, name, 1); -} -#endif - -/* add an elf symbol : check if it is already defined and patch - it. Return symbol index. NOTE that sh_num can be SHN_UNDEF. */ -ST_FUNC int set_elf_sym(Section *s, addr_t value, unsigned long size, - int info, int other, int shndx, 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); - - sym_index = find_elf_sym(s, name); - esym = &((ElfW(Sym) *)s->data)[sym_index]; - if (sym_index && esym->st_value == value && esym->st_size == size - && esym->st_info == info && esym->st_other == other - && esym->st_shndx == shndx) - return sym_index; - - if (sym_bind != STB_LOCAL) { - /* we search global or weak symbols */ - if (!sym_index) - goto do_def; - 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 (shndx == 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_bind == STB_WEAK && esym_bind == STB_WEAK) { - /* keep first-found weak definition, ignore subsequents */ - } else if (sym_vis == STV_HIDDEN || sym_vis == STV_INTERNAL) { - /* ignore hidden symbols after */ - } else if ((esym->st_shndx == SHN_COMMON - || esym->st_shndx == bss_section->sh_num) - && (shndx < SHN_LORESERVE - && shndx != bss_section->sh_num)) { - /* data symbol gets precedence over common/bss */ - goto do_patch; - } else if (shndx == SHN_COMMON || shndx == bss_section->sh_num) { - /* data symbol keeps precedence over common/bss */ - } else if (s == tcc_state->dynsymtab_section) { - /* we accept that two DLL define the same symbol */ - } else { -#if 0 - printf("new_bind=%x new_shndx=%x new_vis=%x old_bind=%x old_shndx=%x old_vis=%x\n", - sym_bind, shndx, new_vis, esym_bind, esym->st_shndx, esym_vis); -#endif - tcc_error_noabort("'%s' defined twice", name); - } - } else { - do_patch: - esym->st_info = ELFW(ST_INFO)(sym_bind, sym_type); - esym->st_shndx = shndx; - new_undef_sym = 1; - 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, - shndx, name); - } - return sym_index; -} - -/* put relocation */ -ST_FUNC void put_elf_reloca(Section *symtab, Section *s, unsigned long offset, - int type, int symbol, addr_t addend) -{ - 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); -#if SHT_RELX == SHT_RELA - rel->r_addend = addend; -#else - if (addend) - tcc_error("non-zero addend on REL architecture"); -#endif -} - -ST_FUNC void put_elf_reloc(Section *symtab, Section *s, unsigned long offset, - int type, int symbol) -{ - put_elf_reloca(symtab, s, offset, type, symbol, 0); -} - -/* Remove relocations for section S->reloc starting at oldrelocoffset - that are to the same place, retaining the last of them. As side effect - the relocations are sorted. Possibly reduces the number of relocs. */ -ST_FUNC void squeeze_multi_relocs(Section *s, size_t oldrelocoffset) -{ - Section *sr = s->reloc; - ElfW_Rel *r, *dest; - ssize_t a; - ElfW(Addr) addr; - - if (oldrelocoffset + sizeof(*r) >= sr->data_offset) - return; - /* The relocs we're dealing with are the result of initializer parsing. - So they will be mostly in order and there aren't many of them. - Secondly we need a stable sort (which qsort isn't). We use - a simple insertion sort. */ - for (a = oldrelocoffset + sizeof(*r); a < sr->data_offset; a += sizeof(*r)) { - ssize_t i = a - sizeof(*r); - addr = ((ElfW_Rel*)(sr->data + a))->r_offset; - for (; i >= (ssize_t)oldrelocoffset && - ((ElfW_Rel*)(sr->data + i))->r_offset > addr; i -= sizeof(*r)) { - ElfW_Rel tmp = *(ElfW_Rel*)(sr->data + a); - *(ElfW_Rel*)(sr->data + a) = *(ElfW_Rel*)(sr->data + i); - *(ElfW_Rel*)(sr->data + i) = tmp; - } - } - - r = (ElfW_Rel*)(sr->data + oldrelocoffset); - dest = r; - for (; r < (ElfW_Rel*)(sr->data + sr->data_offset); r++) { - if (dest->r_offset != r->r_offset) - dest++; - *dest = *r; - } - sr->data_offset = (unsigned char*)dest - sr->data + sizeof(*r); -} - -/* put stab debug information */ - -ST_FUNC 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; -} - -ST_FUNC 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); -} - -ST_FUNC void put_stabn(int type, int other, int desc, int value) -{ - put_stabs(NULL, type, other, desc, value); -} - -ST_FUNC void put_stabd(int type, int other, int desc) -{ - put_stabs(NULL, type, other, desc, 0); -} - -ST_FUNC struct sym_attr *get_sym_attr(TCCState *s1, int index, int alloc) -{ - int n; - struct sym_attr *tab; - - if (index >= s1->nb_sym_attrs) { - if (!alloc) - return s1->sym_attrs; - /* find immediately bigger power of 2 and reallocate array */ - n = 1; - while (index >= n) - n *= 2; - tab = tcc_realloc(s1->sym_attrs, n * sizeof(*s1->sym_attrs)); - s1->sym_attrs = tab; - memset(s1->sym_attrs + s1->nb_sym_attrs, 0, - (n - s1->nb_sym_attrs) * sizeof(*s1->sym_attrs)); - s1->nb_sym_attrs = n; - } - return &s1->sym_attrs[index]; -} - -/* Browse each elem of type <type> in section <sec> starting at elem <startoff> - using variable <elem> */ -#define for_each_elem(sec, startoff, elem, type) \ - for (elem = (type *) sec->data + startoff; \ - elem < (type *) (sec->data + sec->data_offset); elem++) - -/* 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; - 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 */ - if( s->sh_size ) /* this 'if' makes IDA happy */ - 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) { - for_each_elem(sr, 0, rel, ElfW_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 */ -ST_FUNC void relocate_common_syms(void) -{ - ElfW(Sym) *sym; - - for_each_elem(symtab_section, 1, sym, ElfW(Sym)) { - if (sym->st_shndx == SHN_COMMON) { - /* symbol alignment is in st_value for SHN_COMMONs */ - sym->st_value = section_add(bss_section, sym->st_size, - sym->st_value); - sym->st_shndx = bss_section->sh_num; - } - } -} - -/* relocate symbol table, resolve undefined symbols if do_resolve is - true and output error if undefined symbol. */ -ST_FUNC void relocate_syms(TCCState *s1, Section *symtab, int do_resolve) -{ - ElfW(Sym) *sym; - int sym_bind, sh_num; - const char *name; - - for_each_elem(symtab, 1, sym, ElfW(Sym)) { - sh_num = sym->st_shndx; - if (sh_num == SHN_UNDEF) { - name = (char *) strtab_section->data + sym->st_name; - /* Use ld.so to resolve symbol for us (for tcc -run) */ - if (do_resolve) { -#if defined TCC_IS_NATIVE && !defined TCC_TARGET_PE - void *addr = dlsym(RTLD_DEFAULT, name); - if (addr) { - sym->st_value = (addr_t) addr; -#ifdef DEBUG_RELOC - printf ("relocate_sym: %s -> 0x%lx\n", name, sym->st_value); -#endif - goto found; - } -#endif - /* if dynamic symbol exist, it will be used in relocate_section */ - } else if (s1->dynsym && find_elf_sym(s1->dynsym, name)) - 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 - tcc_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: ; - } -} - -/* relocate a given section (CPU dependent) by applying the relocations - in the associated relocation section */ -ST_FUNC void relocate_section(TCCState *s1, Section *s) -{ - Section *sr = s->reloc; - ElfW_Rel *rel; - ElfW(Sym) *sym; - int type, sym_index; - unsigned char *ptr; - addr_t tgt, addr; - - relocate_init(sr); - - for_each_elem(sr, 0, rel, ElfW_Rel) { - ptr = s->data + rel->r_offset; - sym_index = ELFW(R_SYM)(rel->r_info); - sym = &((ElfW(Sym) *)symtab_section->data)[sym_index]; - type = ELFW(R_TYPE)(rel->r_info); - tgt = sym->st_value; -#if SHT_RELX == SHT_RELA - tgt += rel->r_addend; -#endif - addr = s->sh_addr + rel->r_offset; - relocate(s1, rel, type, ptr, addr, tgt); - } - /* 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; - - s = s1->sections[sr->sh_info]; - for_each_elem(sr, 0, rel, ElfW_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; - int sym_index, type, count; - - count = 0; - for_each_elem(sr, 0, rel, ElfW_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: - if (!get_sym_attr(s1, sym_index, 0)->dyn_index - && ((ElfW(Sym)*)symtab_section->data + sym_index)->st_shndx == SHN_UNDEF) { - /* don't fixup unresolved (weak) symbols */ - rel->r_info = ELFW(R_INFO)(sym_index, R_386_RELATIVE); - break; - } -#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 - if (get_sym_attr(s1, sym_index, 0)->dyn_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 build_got(TCCState *s1) -{ - /* if no got, then create it */ - s1->got = new_section(s1, ".got", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE); - s1->got->sh_entsize = 4; - set_elf_sym(symtab_section, 0, 4, ELFW(ST_INFO)(STB_GLOBAL, STT_OBJECT), - 0, s1->got->sh_num, "_GLOBAL_OFFSET_TABLE_"); - /* keep space for _DYNAMIC pointer and two dummy got entries */ - section_ptr_add(s1->got, 3 * PTR_SIZE); -} - -/* Create a GOT and (for function call) a PLT entry corresponding to a symbol - in s1->symtab. When creating the dynamic symbol table entry for the GOT - relocation, use 'size' and 'info' for the corresponding symbol metadata. - Returns the offset of the GOT or (if any) PLT entry. */ -static struct sym_attr * put_got_entry(TCCState *s1, int dyn_reloc_type, - unsigned long size, - int info, int sym_index) -{ - int need_plt_entry; - const char *name; - ElfW(Sym) *sym; - struct sym_attr *attr; - unsigned got_offset; - char plt_name[100]; - int len; - - need_plt_entry = (dyn_reloc_type == R_JMP_SLOT); - attr = get_sym_attr(s1, sym_index, 1); - - /* In case a function is both called and its address taken 2 GOT entries - are created, one for taking the address (GOT) and the other for the PLT - entry (PLTGOT). */ - if (need_plt_entry ? attr->plt_offset : attr->got_offset) - return attr; - - /* create the GOT entry */ - got_offset = s1->got->data_offset; - section_ptr_add(s1->got, PTR_SIZE); - - /* Create the GOT relocation that will insert the address of the object or - function of interest in the GOT entry. This is a static relocation for - memory output (dlsym will give us the address of symbols) and dynamic - relocation otherwise (executable and DLLs). The relocation should be - done lazily for GOT entry with *_JUMP_SLOT relocation type (the one - associated to a PLT entry) but is currently done at load time for an - unknown reason. */ - - sym = &((ElfW(Sym) *) symtab_section->data)[sym_index]; - name = (char *) symtab_section->link->data + sym->st_name; - - if (s1->dynsym) { - if (ELFW(ST_BIND)(sym->st_info) == STB_LOCAL) { - /* Hack alarm. We don't want to emit dynamic symbols - and symbol based relocs for STB_LOCAL symbols, but rather - want to resolve them directly. At this point the symbol - values aren't final yet, so we must defer this. We will later - have to create a RELATIVE reloc anyway, so we misuse the - relocation slot to smuggle the symbol reference until - fill_local_got_entries. Not that the sym_index is - relative to symtab_section, not s1->dynsym! Nevertheless - we use s1->dyn_sym so that if this is the first call - that got->reloc is correctly created. Also note that - RELATIVE relocs are not normally created for the .got, - so the types serves as a marker for later (and is retained - also for the final output, which is okay because then the - got is just normal data). */ - put_elf_reloc(s1->dynsym, s1->got, got_offset, R_RELATIVE, - sym_index); - } else { - if (0 == attr->dyn_index) - attr->dyn_index = set_elf_sym(s1->dynsym, sym->st_value, size, - info, 0, sym->st_shndx, name); - put_elf_reloc(s1->dynsym, s1->got, got_offset, dyn_reloc_type, - attr->dyn_index); - } - } else { - put_elf_reloc(symtab_section, s1->got, got_offset, dyn_reloc_type, - sym_index); - } - - if (need_plt_entry) { - if (!s1->plt) { - s1->plt = new_section(s1, ".plt", SHT_PROGBITS, - SHF_ALLOC | SHF_EXECINSTR); - s1->plt->sh_entsize = 4; - } - - attr->plt_offset = create_plt_entry(s1, got_offset, attr); - - /* create a symbol 'sym@plt' for the PLT jump vector */ - len = strlen(name); - if (len > sizeof plt_name - 5) - len = sizeof plt_name - 5; - memcpy(plt_name, name, len); - strcpy(plt_name + len, "@plt"); - attr->plt_sym = put_elf_sym(s1->symtab, attr->plt_offset, sym->st_size, - ELFW(ST_INFO)(STB_GLOBAL, STT_FUNC), 0, s1->plt->sh_num, plt_name); - - } else { - attr->got_offset = got_offset; - } - - return attr; -} - -/* build GOT and PLT entries */ -ST_FUNC void build_got_entries(TCCState *s1) -{ - Section *s; - ElfW_Rel *rel; - ElfW(Sym) *sym; - int i, type, gotplt_entry, reloc_type, sym_index; - struct sym_attr *attr; - - 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; - for_each_elem(s, 0, rel, ElfW_Rel) { - type = ELFW(R_TYPE)(rel->r_info); - gotplt_entry = gotplt_entry_type(type); - sym_index = ELFW(R_SYM)(rel->r_info); - sym = &((ElfW(Sym) *)symtab_section->data)[sym_index]; - - if (gotplt_entry == NO_GOTPLT_ENTRY) { - continue; - } - - /* Automatically create PLT/GOT [entry] if it is an undefined - reference (resolved at runtime), or the symbol is absolute, - probably created by tcc_add_symbol, and thus on 64-bit - targets might be too far from application code. */ - if (gotplt_entry == AUTO_GOTPLT_ENTRY) { - if (sym->st_shndx == SHN_UNDEF) { - ElfW(Sym) *esym; - int dynindex; - if (s1->output_type == TCC_OUTPUT_DLL && ! PCRELATIVE_DLLPLT) - continue; - /* Relocations for UNDEF symbols would normally need - to be transferred into the executable or shared object. - If that were done AUTO_GOTPLT_ENTRY wouldn't exist. - But TCC doesn't do that (at least for exes), so we - need to resolve all such relocs locally. And that - means PLT slots for functions in DLLs and COPY relocs for - data symbols. COPY relocs were generated in - bind_exe_dynsyms (and the symbol adjusted to be defined), - and for functions we were generated a dynamic symbol - of function type. */ - if (s1->dynsym) { - /* dynsym isn't set for -run :-/ */ - dynindex = get_sym_attr(s1, sym_index, 0)->dyn_index; - esym = (ElfW(Sym) *)s1->dynsym->data + dynindex; - if (dynindex - && (ELFW(ST_TYPE)(esym->st_info) == STT_FUNC - || (ELFW(ST_TYPE)(esym->st_info) == STT_NOTYPE - && ELFW(ST_TYPE)(sym->st_info) == STT_FUNC))) - goto jmp_slot; - } - } else if (!(sym->st_shndx == SHN_ABS -#ifndef TCC_TARGET_ARM - && PTR_SIZE == 8 -#endif - )) - continue; - } - -#ifdef TCC_TARGET_X86_64 - if ((type == R_X86_64_PLT32 || type == R_X86_64_PC32) && - (ELFW(ST_VISIBILITY)(sym->st_other) != STV_DEFAULT || - ELFW(ST_BIND)(sym->st_info) == STB_LOCAL)) { - rel->r_info = ELFW(R_INFO)(sym_index, R_X86_64_PC32); - continue; - } -#endif - if (code_reloc(type)) { - jmp_slot: - reloc_type = R_JMP_SLOT; - } else - reloc_type = R_GLOB_DAT; - - if (!s1->got) - build_got(s1); - - if (gotplt_entry == BUILD_GOT_ONLY) - continue; - - attr = put_got_entry(s1, reloc_type, sym->st_size, sym->st_info, - sym_index); - - if (reloc_type == R_JMP_SLOT) - rel->r_info = ELFW(R_INFO)(attr->plt_sym, type); - } - } -} - -/* put dynamic tag */ -static void put_dt(Section *dynamic, int dt, addr_t val) -{ - ElfW(Dyn) *dyn; - dyn = section_ptr_add(dynamic, sizeof(ElfW(Dyn))); - dyn->d_tag = dt; - dyn->d_un.d_val = val; -} - -#ifndef TCC_TARGET_PE -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; - } - - set_elf_sym(symtab_section, - 0, 0, - ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0, - s->sh_num, sym_start); - set_elf_sym(symtab_section, - end_offset, 0, - ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0, - s->sh_num, sym_end); -} -#endif - -static int tcc_add_support(TCCState *s1, const char *filename) -{ - char buf[1024]; - snprintf(buf, sizeof(buf), "%s/%s", s1->tcc_lib_path, filename); - return tcc_add_file(s1, buf); -} - -ST_FUNC void tcc_add_bcheck(TCCState *s1) -{ -#ifdef CONFIG_TCC_BCHECK - addr_t *ptr; - int sym_index; - - if (0 == s1->do_bounds_check) - return; - /* XXX: add an object file to do that */ - ptr = section_ptr_add(bounds_section, sizeof(*ptr)); - *ptr = 0; - set_elf_sym(symtab_section, 0, 0, - ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0, - bounds_section->sh_num, "__bounds_start"); - /* pull bcheck.o from libtcc1.a */ - sym_index = set_elf_sym(symtab_section, 0, 0, - ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0, - SHN_UNDEF, "__bound_init"); - if (s1->output_type != TCC_OUTPUT_MEMORY) { - /* add 'call __bound_init()' in .init section */ - Section *init_section = find_section(s1, ".init"); - unsigned char *pinit = section_ptr_add(init_section, 5); - pinit[0] = 0xe8; - write32le(pinit + 1, -4); - put_elf_reloc(symtab_section, init_section, - init_section->data_offset - 4, R_386_PC32, sym_index); - /* R_386_PC32 = R_X86_64_PC32 = 2 */ - } -#endif -} - -/* add tcc runtime libraries */ -ST_FUNC void tcc_add_runtime(TCCState *s1) -{ - tcc_add_bcheck(s1); - tcc_add_pragma_libs(s1); - /* add libc */ - if (!s1->nostdlib) { - tcc_add_library_err(s1, "c"); -#ifdef TCC_LIBGCC - if (!s1->static_link) { - if (TCC_LIBGCC[0] == '/') - tcc_add_file(s1, TCC_LIBGCC); - else - tcc_add_dll(s1, TCC_LIBGCC, 0); - } -#endif - tcc_add_support(s1, TCC_LIBTCC1); - /* add crt end if not memory output */ - if (s1->output_type != TCC_OUTPUT_MEMORY) - tcc_add_crt(s1, "crtn.o"); - } -} - -/* add various standard linker symbols (must be done after the - sections are filled (for example after allocating common - symbols)) */ -ST_FUNC void tcc_add_linker_symbols(TCCState *s1) -{ - char buf[1024]; - int i; - Section *s; - - set_elf_sym(symtab_section, - text_section->data_offset, 0, - ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0, - text_section->sh_num, "_etext"); - set_elf_sym(symtab_section, - data_section->data_offset, 0, - ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0, - data_section->sh_num, "_edata"); - set_elf_sym(symtab_section, - bss_section->data_offset, 0, - ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0, - bss_section->sh_num, "_end"); -#ifndef TCC_TARGET_PE - /* 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"); -#endif - - /* 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); - set_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); - set_elf_sym(symtab_section, - s->data_offset, 0, - ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0, - s->sh_num, buf); - } - next_sec: ; - } -} - -static void tcc_output_binary(TCCState *s1, FILE *f, - const int *sec_order) -{ - Section *s; - int i, offset, size; - - offset = 0; - for(i=1;i<s1->nb_sections;i++) { - s = s1->sections[sec_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; - } - } -} - -ST_FUNC void fill_got_entry(TCCState *s1, ElfW_Rel *rel) -{ - int sym_index = ELFW(R_SYM) (rel->r_info); - ElfW(Sym) *sym = &((ElfW(Sym) *) symtab_section->data)[sym_index]; - struct sym_attr *attr = get_sym_attr(s1, sym_index, 0); - unsigned offset = attr->got_offset; - - if (0 == offset) - return; - section_reserve(s1->got, offset + PTR_SIZE); -#ifdef TCC_TARGET_X86_64 - write64le(s1->got->data + offset, sym->st_value); -#else - write32le(s1->got->data + offset, sym->st_value); -#endif -} - -/* Perform relocation to GOT or PLT entries */ -ST_FUNC void fill_got(TCCState *s1) -{ - Section *s; - ElfW_Rel *rel; - int i; - - 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; - for_each_elem(s, 0, rel, ElfW_Rel) { - switch (ELFW(R_TYPE) (rel->r_info)) { - case R_X86_64_GOT32: - case R_X86_64_GOTPCREL: - case R_X86_64_GOTPCRELX: - case R_X86_64_REX_GOTPCRELX: - case R_X86_64_PLT32: - fill_got_entry(s1, rel); - break; - } - } - } -} - -/* See put_got_entry for a description. This is the second stage - where GOT references to local defined symbols are rewritten. */ -static void fill_local_got_entries(TCCState *s1) -{ - ElfW_Rel *rel; - for_each_elem(s1->got->reloc, 0, rel, ElfW_Rel) { - if (ELFW(R_TYPE)(rel->r_info) == R_RELATIVE) { - int sym_index = ELFW(R_SYM) (rel->r_info); - ElfW(Sym) *sym = &((ElfW(Sym) *) symtab_section->data)[sym_index]; - struct sym_attr *attr = get_sym_attr(s1, sym_index, 0); - unsigned offset = attr->got_offset; - if (offset != rel->r_offset - s1->got->sh_addr) - tcc_error_noabort("huh"); - rel->r_info = ELFW(R_INFO)(0, R_RELATIVE); -#if SHT_RELX == SHT_RELA - rel->r_addend = sym->st_value; -#else - /* All our REL architectures also happen to be 32bit LE. */ - write32le(s1->got->data + offset, sym->st_value); -#endif - } - } -} - -/* Bind symbols of executable: resolve undefined symbols from exported symbols - in shared libraries and export non local defined symbols to shared libraries - if -rdynamic switch was given on command line */ -static void bind_exe_dynsyms(TCCState *s1) -{ - const char *name; - int sym_index, index; - ElfW(Sym) *sym, *esym; - int type; - - /* Resolve undefined symbols from dynamic symbols. When there is a match: - - if STT_FUNC or STT_GNU_IFUNC symbol -> add it in PLT - - if STT_OBJECT symbol -> add it in .bss section with suitable reloc */ - for_each_elem(symtab_section, 1, sym, ElfW(Sym)) { - if (sym->st_shndx == SHN_UNDEF) { - name = (char *) 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) || (type == STT_GNU_IFUNC)) { - /* Indirect functions shall have STT_FUNC type in executable - * dynsym section. Indeed, a dlsym call following a lazy - * resolution would pick the symbol value from the - * executable dynsym entry which would contain the address - * of the function wanted by the caller of dlsym instead of - * the address of the function that would return that - * address */ - int dynindex - = put_elf_sym(s1->dynsym, 0, esym->st_size, - ELFW(ST_INFO)(STB_GLOBAL,STT_FUNC), 0, 0, - name); - int index = sym - (ElfW(Sym) *) symtab_section->data; - get_sym_attr(s1, index, 1)->dyn_index = dynindex; - } else if (type == STT_OBJECT) { - unsigned long offset; - ElfW(Sym) *dynsym; - offset = bss_section->data_offset; - /* XXX: which alignment ? */ - offset = (offset + 16 - 1) & -16; - set_elf_sym (s1->symtab, offset, esym->st_size, - esym->st_info, 0, bss_section->sh_num, name); - index = put_elf_sym(s1->dynsym, offset, esym->st_size, - esym->st_info, 0, bss_section->sh_num, - name); - - /* Ensure R_COPY works for weak symbol aliases */ - if (ELFW(ST_BIND)(esym->st_info) == STB_WEAK) { - for_each_elem(s1->dynsymtab_section, 1, dynsym, ElfW(Sym)) { - if ((dynsym->st_value == esym->st_value) - && (ELFW(ST_BIND)(dynsym->st_info) == STB_GLOBAL)) { - char *dynname = (char *) s1->dynsymtab_section->link->data - + dynsym->st_name; - put_elf_sym(s1->dynsym, offset, dynsym->st_size, - dynsym->st_info, 0, - bss_section->sh_num, dynname); - break; - } - } - } - - 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 { - tcc_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 = (char *) symtab_section->link->data + sym->st_name; - set_elf_sym(s1->dynsym, sym->st_value, sym->st_size, sym->st_info, - 0, sym->st_shndx, name); - } - } -} - -/* Bind symbols of libraries: export all non local symbols of executable that - are referenced by shared libraries. The reason is that the dynamic loader - search symbol first in executable and then in libraries. Therefore a - reference to a symbol already defined by a library can still be resolved by - a symbol in the executable. */ -static void bind_libs_dynsyms(TCCState *s1) -{ - const char *name; - int sym_index; - ElfW(Sym) *sym, *esym; - - for_each_elem(s1->dynsymtab_section, 1, esym, ElfW(Sym)) { - name = (char *) s1->dynsymtab_section->link->data + esym->st_name; - sym_index = find_elf_sym(symtab_section, name); - sym = &((ElfW(Sym) *)symtab_section->data)[sym_index]; - if (sym_index && sym->st_shndx != SHN_UNDEF - && ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) { - set_elf_sym(s1->dynsym, sym->st_value, sym->st_size, - sym->st_info, 0, sym->st_shndx, name); - } else if (esym->st_shndx == SHN_UNDEF) { - /* weak symbols can stay undefined */ - if (ELFW(ST_BIND)(esym->st_info) != STB_WEAK) - tcc_warning("undefined dynamic symbol '%s'", name); - } - } -} - -/* Export all non local symbols. This is used by shared libraries so that the - non local symbols they define can resolve a reference in another shared - library or in the executable. Correspondingly, it allows undefined local - symbols to be resolved by other shared libraries or by the executable. */ -static void export_global_syms(TCCState *s1) -{ - int dynindex, index; - const char *name; - ElfW(Sym) *sym; - - for_each_elem(symtab_section, 1, sym, ElfW(Sym)) { - if (ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) { - name = (char *) symtab_section->link->data + sym->st_name; - dynindex = put_elf_sym(s1->dynsym, sym->st_value, sym->st_size, - sym->st_info, 0, sym->st_shndx, name); - index = sym - (ElfW(Sym) *) symtab_section->data; - get_sym_attr(s1, index, 1)->dyn_index = dynindex; - } - } -} - -/* 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 ! */ -static int alloc_sec_names(TCCState *s1, int file_type, Section *strsec) -{ - int i; - Section *s; - int textrel = 0; - - /* Allocate strings for section names */ - for(i = 1; i < s1->nb_sections; i++) { - s = s1->sections[i]; - /* 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) && - (s1->sections[s->sh_info]->sh_flags & SHF_ALLOC) && - prepare_dynamic_rel(s1, s)) { - if (s1->sections[s->sh_info]->sh_flags & SHF_EXECINSTR) - textrel = 1; - } 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; - } - if (s->sh_size || (s->sh_flags & SHF_ALLOC)) - s->sh_name = put_elf_str(strsec, s->name); - } - strsec->sh_size = strsec->data_offset; - return textrel; -} - -/* Info to be copied in dynamic section */ -struct dyn_inf { - Section *dynamic; - Section *dynstr; - unsigned long data_offset; - addr_t rel_addr; - addr_t rel_size; -#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) - addr_t bss_addr; - addr_t bss_size; -#endif -}; - -/* Assign sections to segments and decide how are sections laid out when loaded - in memory. This function also fills corresponding program headers. */ -static int layout_sections(TCCState *s1, ElfW(Phdr) *phdr, int phnum, - Section *interp, Section* strsec, - struct dyn_inf *dyninf, int *sec_order) -{ - int i, j, k, file_type, sh_order_index, file_offset; - unsigned long s_align; - long long tmp; - addr_t addr; - ElfW(Phdr) *ph; - Section *s; - - file_type = s1->output_type; - sh_order_index = 1; - file_offset = 0; - if (s1->output_format == TCC_OUTPUT_FORMAT_ELF) - file_offset = sizeof(ElfW(Ehdr)) + phnum * sizeof(ElfW(Phdr)); - s_align = ELF_PAGE_SIZE; - if (s1->section_align) - s_align = s1->section_align; - - if (phnum > 0) { - 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 = (int) (addr & (s_align - 1)); - p_offset = file_offset & (s_align - 1); - if (a_offset < p_offset) - a_offset += s_align; - 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 & (s_align - 1)); - } - - ph = &phdr[0]; - /* Leave one program headers for the program interpreter and one for - the program header table itself if needed. These are done later as - they require section layout to be done first. */ - if (interp) - ph += 2; - - /* dynamic relocation table information, for .dynamic section */ - dyninf->rel_addr = dyninf->rel_size = 0; -#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) - dyninf->bss_addr = dyninf->bss_size = 0; -#endif - - 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 = s_align; - - /* Decide the layout of sections loaded in memory. This must - be done before program headers are filled since they contain - info about the layout. 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; - } - sec_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 += (int) ( 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 defined(__FreeBSD__) || defined(__FreeBSD_kernel__) - if (!strcmp(strsec->data + s->sh_name, ".rel.got")) { - dyninf->rel_addr = addr; - dyninf->rel_size += s->sh_size; /* XXX only first rel. */ - } - if (!strcmp(strsec->data + s->sh_name, ".rel.bss")) { - dyninf->bss_addr = addr; - dyninf->bss_size = s->sh_size; /* XXX only first rel. */ - } -#else - if (dyninf->rel_size == 0) - dyninf->rel_addr = addr; - dyninf->rel_size += s->sh_size; -#endif - } - addr += s->sh_size; - if (s->sh_type != SHT_NOBITS) - file_offset += s->sh_size; - } - } - if (j == 0) { - /* Make the first PT_LOAD segment include the program - headers itself (and the ELF header as well), it'll - come out with same memory use but will make various - tools like binutils strip work better. */ - ph->p_offset &= ~(ph->p_align - 1); - ph->p_vaddr &= ~(ph->p_align - 1); - ph->p_paddr &= ~(ph->p_align - 1); - } - 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 & (s_align - 1)) != 0) - addr += s_align; - } else { - addr = (addr + s_align - 1) & ~(s_align - 1); - file_offset = (file_offset + s_align - 1) & ~(s_align - 1); - } - } - } - } - - /* 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; - sec_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; - } - - return file_offset; -} - -static void fill_unloadable_phdr(ElfW(Phdr) *phdr, int phnum, Section *interp, - Section *dynamic) -{ - ElfW(Phdr) *ph; - - /* if interpreter, then add corresponding program header */ - if (interp) { - ph = &phdr[0]; - - ph->p_type = PT_PHDR; - ph->p_offset = sizeof(ElfW(Ehdr)); - ph->p_filesz = ph->p_memsz = phnum * sizeof(ElfW(Phdr)); - ph->p_vaddr = interp->sh_addr - ph->p_filesz; - ph->p_paddr = ph->p_vaddr; - ph->p_flags = PF_R | PF_X; - ph->p_align = 4; /* interp->sh_addralign; */ - ph++; - - 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 corresponding program header */ - if (dynamic) { - 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; - } -} - -/* Fill the dynamic section with tags describing the address and size of - sections */ -static void fill_dynamic(TCCState *s1, struct dyn_inf *dyninf) -{ - Section *dynamic = dyninf->dynamic; - - /* put dynamic section entries */ - put_dt(dynamic, DT_HASH, s1->dynsym->hash->sh_addr); - put_dt(dynamic, DT_STRTAB, dyninf->dynstr->sh_addr); - put_dt(dynamic, DT_SYMTAB, s1->dynsym->sh_addr); - put_dt(dynamic, DT_STRSZ, dyninf->dynstr->data_offset); - put_dt(dynamic, DT_SYMENT, sizeof(ElfW(Sym))); -#if PTR_SIZE == 8 - put_dt(dynamic, DT_RELA, dyninf->rel_addr); - put_dt(dynamic, DT_RELASZ, dyninf->rel_size); - put_dt(dynamic, DT_RELAENT, sizeof(ElfW_Rel)); -#else -#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) - put_dt(dynamic, DT_PLTGOT, s1->got->sh_addr); - put_dt(dynamic, DT_PLTRELSZ, dyninf->rel_size); - put_dt(dynamic, DT_JMPREL, dyninf->rel_addr); - put_dt(dynamic, DT_PLTREL, DT_REL); - put_dt(dynamic, DT_REL, dyninf->bss_addr); - put_dt(dynamic, DT_RELSZ, dyninf->bss_size); -#else - put_dt(dynamic, DT_REL, dyninf->rel_addr); - put_dt(dynamic, DT_RELSZ, dyninf->rel_size); - put_dt(dynamic, DT_RELENT, sizeof(ElfW_Rel)); -#endif -#endif - if (s1->do_debug) - put_dt(dynamic, DT_DEBUG, 0); - put_dt(dynamic, DT_NULL, 0); -} - -/* Relocate remaining sections and symbols (that is those not related to - dynamic linking) */ -static int final_sections_reloc(TCCState *s1) -{ - int i; - Section *s; - - relocate_syms(s1, s1->symtab, 0); - - if (s1->nb_errors != 0) - return -1; - - /* relocate sections */ - /* XXX: ignore sections with allocated relocations ? */ - for(i = 1; i < s1->nb_sections; i++) { - s = s1->sections[i]; -#if defined(TCC_TARGET_I386) || defined(TCC_MUSL) - if (s->reloc && s != s1->got && (s->sh_flags & SHF_ALLOC)) //gr - /* On X86 gdb 7.3 works in any case but gdb 6.6 will crash if SHF_ALLOC - checking is removed */ -#else - if (s->reloc && s != s1->got) - /* On X86_64 gdb 7.3 will crash if SHF_ALLOC checking is present */ -#endif - 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); - } - } - return 0; -} - -/* Create an ELF file on disk. - This function handle ELF specific layout requirements */ -static void tcc_output_elf(TCCState *s1, FILE *f, int phnum, ElfW(Phdr) *phdr, - int file_offset, int *sec_order) -{ - int i, shnum, offset, size, file_type; - Section *s; - ElfW(Ehdr) ehdr; - ElfW(Shdr) shdr, *sh; - - file_type = s1->output_type; - shnum = s1->nb_sections; - - memset(&ehdr, 0, sizeof(ehdr)); - - if (phnum > 0) { - ehdr.e_phentsize = sizeof(ElfW(Phdr)); - ehdr.e_phnum = phnum; - ehdr.e_phoff = sizeof(ElfW(Ehdr)); - } - - /* 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] = ELFCLASSW; - ehdr.e_ident[5] = ELFDATA2LSB; - ehdr.e_ident[6] = EV_CURRENT; -#if !defined(TCC_TARGET_PE) && (defined(__FreeBSD__) || defined(__FreeBSD_kernel__)) - /* FIXME: should set only for freebsd _target_, but we exclude only PE target */ - 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 = EF_ARM_EABI_VER4; - if (file_type == TCC_OUTPUT_EXE || file_type == TCC_OUTPUT_DLL) - ehdr.e_flags |= EF_ARM_HASENTRY; - if (s1->float_abi == ARM_HARD_FLOAT) - ehdr.e_flags |= EF_ARM_VFP_FLOAT; - else - ehdr.e_flags |= EF_ARM_SOFT_FLOAT; -#else - ehdr.e_ident[EI_OSABI] = ELFOSABI_ARM; -#endif -#endif - switch(file_type) { - default: - case TCC_OUTPUT_EXE: - ehdr.e_type = ET_EXEC; - ehdr.e_entry = get_elf_sym_addr(s1, "_start", 1); - break; - case TCC_OUTPUT_DLL: - ehdr.e_type = ET_DYN; - ehdr.e_entry = text_section->sh_addr; /* XXX: is it correct ? */ - 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)); - - sort_syms(s1, symtab_section); - for(i = 1; i < s1->nb_sections; i++) { - s = s1->sections[sec_order[i]]; - if (s->sh_type != SHT_NOBITS) { - while (offset < s->sh_offset) { - fputc(0, f); - offset++; - } - size = s->sh_size; - if (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); - } -} - -/* Write an elf, coff or "binary" file */ -static int tcc_write_elf_file(TCCState *s1, const char *filename, int phnum, - ElfW(Phdr) *phdr, int file_offset, int *sec_order) -{ - int fd, mode, file_type; - FILE *f; - - file_type = s1->output_type; - if (file_type == TCC_OUTPUT_OBJ) - mode = 0666; - else - mode = 0777; - unlink(filename); - fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, mode); - if (fd < 0) { - tcc_error_noabort("could not write '%s'", filename); - return -1; - } - 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) - tcc_output_elf(s1, f, phnum, phdr, file_offset, sec_order); - else - tcc_output_binary(s1, f, sec_order); - fclose(f); - - return 0; -} - -/* Sort section headers by assigned sh_addr, remove sections - that we aren't going to output. */ -static void tidy_section_headers(TCCState *s1, int *sec_order) -{ - int i, nnew, l, *backmap; - Section **snew, *s; - ElfW(Sym) *sym; - - snew = tcc_malloc(s1->nb_sections * sizeof(snew[0])); - backmap = tcc_malloc(s1->nb_sections * sizeof(backmap[0])); - for (i = 0, nnew = 0, l = s1->nb_sections; i < s1->nb_sections; i++) { - s = s1->sections[sec_order[i]]; - if (!i || s->sh_name) { - backmap[sec_order[i]] = nnew; - snew[nnew] = s; - ++nnew; - } else { - backmap[sec_order[i]] = 0; - snew[--l] = s; - } - } - for (i = 0; i < nnew; i++) { - s = snew[i]; - if (s) { - s->sh_num = i; - if (s->sh_type == SHT_RELX) - s->sh_info = backmap[s->sh_info]; - } - } - - for_each_elem(symtab_section, 1, sym, ElfW(Sym)) - if (sym->st_shndx != SHN_UNDEF && sym->st_shndx < SHN_LORESERVE) - sym->st_shndx = backmap[sym->st_shndx]; - if( !s1->static_link ) { - for_each_elem(s1->dynsym, 1, sym, ElfW(Sym)) - if (sym->st_shndx != SHN_UNDEF && sym->st_shndx < SHN_LORESERVE) - sym->st_shndx = backmap[sym->st_shndx]; - } - for (i = 0; i < s1->nb_sections; i++) - sec_order[i] = i; - tcc_free(s1->sections); - s1->sections = snew; - s1->nb_sections = nnew; - tcc_free(backmap); -} - -/* Output an elf, coff or binary file */ -/* XXX: suppress unneeded sections */ -static int elf_output_file(TCCState *s1, const char *filename) -{ - int i, ret, phnum, shnum, file_type, file_offset, *sec_order; - struct dyn_inf dyninf = {0}; - ElfW(Phdr) *phdr; - ElfW(Sym) *sym; - Section *strsec, *interp, *dynamic, *dynstr; - int textrel; - - file_type = s1->output_type; - s1->nb_errors = 0; - ret = -1; - phdr = NULL; - sec_order = NULL; - interp = dynamic = dynstr = NULL; /* avoid warning */ - textrel = 0; - - if (file_type != TCC_OUTPUT_OBJ) { - /* if linking, also link in runtime libraries (libc, libgcc, etc.) */ - tcc_add_runtime(s1); - relocate_common_syms(); - tcc_add_linker_symbols(s1); - - if (!s1->static_link) { - if (file_type == TCC_OUTPUT_EXE) { - char *ptr; - /* allow override the dynamic loader */ - const char *elfint = getenv("LD_SO"); - if (elfint == NULL) - elfint = DEFAULT_ELFINTERP(s1); - /* add interpreter section only if executable */ - interp = new_section(s1, ".interp", SHT_PROGBITS, SHF_ALLOC); - interp->sh_addralign = 1; - ptr = section_ptr_add(interp, 1 + strlen(elfint)); - strcpy(ptr, elfint); - } - - /* 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)); - - build_got(s1); - - if (file_type == TCC_OUTPUT_EXE) { - bind_exe_dynsyms(s1); - if (s1->nb_errors) - goto the_end; - bind_libs_dynsyms(s1); - } else { - /* shared library case: simply export all global symbols */ - export_global_syms(s1); - } - } - build_got_entries(s1); - } - - /* we add a section for symbols */ - strsec = new_section(s1, ".shstrtab", SHT_STRTAB, 0); - put_elf_str(strsec, ""); - - /* Allocate strings for section names */ - textrel = alloc_sec_names(s1, file_type, strsec); - - if (dynamic) { - /* 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)); - } - - if (s1->rpath) - put_dt(dynamic, s1->enable_new_dtags ? DT_RUNPATH : DT_RPATH, - put_elf_str(dynstr, s1->rpath)); - - if (file_type == TCC_OUTPUT_DLL) { - if (s1->soname) - put_dt(dynamic, DT_SONAME, put_elf_str(dynstr, s1->soname)); - /* XXX: currently, since we do not handle PIC code, we - must relocate the readonly segments */ - if (textrel) - put_dt(dynamic, DT_TEXTREL, 0); - } - - if (s1->symbolic) - put_dt(dynamic, DT_SYMBOLIC, 0); - - dyninf.dynamic = dynamic; - dyninf.dynstr = dynstr; - /* remember offset and reserve space for 2nd call below */ - dyninf.data_offset = dynamic->data_offset; - fill_dynamic(s1, &dyninf); - dynamic->sh_size = dynamic->data_offset; - dynstr->sh_size = dynstr->data_offset; - } - - /* compute number of program headers */ - if (file_type == TCC_OUTPUT_OBJ) - phnum = 0; - else if (file_type == TCC_OUTPUT_DLL) - phnum = 3; - else if (s1->static_link) - phnum = 2; - else - phnum = 5; - - /* allocate program segment headers */ - phdr = tcc_mallocz(phnum * sizeof(ElfW(Phdr))); - - /* compute number of sections */ - shnum = s1->nb_sections; - - /* this array is used to reorder sections in the output file */ - sec_order = tcc_malloc(sizeof(int) * shnum); - sec_order[0] = 0; - - /* compute section to program header mapping */ - file_offset = layout_sections(s1, phdr, phnum, interp, strsec, &dyninf, - sec_order); - - /* Fill remaining program header and finalize relocation related to dynamic - linking. */ - if (file_type != TCC_OUTPUT_OBJ) { - fill_unloadable_phdr(phdr, phnum, interp, dynamic); - if (dynamic) { - dynamic->data_offset = dyninf.data_offset; - fill_dynamic(s1, &dyninf); - - /* put in GOT the dynamic section address and relocate PLT */ - write32le(s1->got->data, dynamic->sh_addr); - if (file_type == TCC_OUTPUT_EXE - || (RELOCATE_DLLPLT && file_type == TCC_OUTPUT_DLL)) - relocate_plt(s1); - - /* relocate symbols in .dynsym now that final addresses are known */ - for_each_elem(s1->dynsym, 1, sym, ElfW(Sym)) { - if (sym->st_shndx != SHN_UNDEF && sym->st_shndx < SHN_LORESERVE) { - /* do symbol relocation */ - sym->st_value += s1->sections[sym->st_shndx]->sh_addr; - } - } - } - - /* if building executable or DLL, then relocate each section - except the GOT which is already relocated */ - ret = final_sections_reloc(s1); - if (ret) - goto the_end; - tidy_section_headers(s1, sec_order); - - /* Perform relocation to GOT or PLT entries */ - if (file_type == TCC_OUTPUT_EXE && s1->static_link) - fill_got(s1); - else if (s1->got) - fill_local_got_entries(s1); - } - - /* Create the ELF file with name 'filename' */ - ret = tcc_write_elf_file(s1, filename, phnum, phdr, file_offset, sec_order); - s1->nb_sections = shnum; - the_end: - tcc_free(sec_order); - tcc_free(phdr); - return ret; -} - -LIBTCCAPI 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; - -ST_FUNC int tcc_object_type(int fd, ElfW(Ehdr) *h) -{ - int size = read(fd, h, sizeof *h); - if (size == sizeof *h && 0 == memcmp(h, ELFMAG, 4)) { - if (h->e_type == ET_REL) - return AFF_BINTYPE_REL; - if (h->e_type == ET_DYN) - return AFF_BINTYPE_DYN; - } else if (size >= 8) { - if (0 == memcmp(h, ARMAG, 8)) - return AFF_BINTYPE_AR; -#ifdef TCC_TARGET_COFF - if (((struct filehdr*)h)->f_magic == COFF_C67_MAGIC) - return AFF_BINTYPE_C67; -#endif - } - return 0; -} - -/* load an object file and merge it with current files */ -/* XXX: handle correctly stab (debug) info */ -ST_FUNC 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, seencompressed; - unsigned char *strsec, *strtab; - int *old_to_new_syms; - char *sh_name, *name; - SectionMergeInfo *sm_table, *sm; - ElfW(Sym) *sym, *symtab; - ElfW_Rel *rel; - Section *s; - - int stab_index; - int stabstr_index; - - stab_index = stabstr_index = 0; - - lseek(fd, file_offset, SEEK_SET); - if (tcc_object_type(fd, &ehdr) != AFF_BINTYPE_REL) - goto fail1; - /* test CPU specific stuff */ - if (ehdr.e_ident[5] != ELFDATA2LSB || - ehdr.e_machine != EM_TCC_TARGET) { - fail1: - tcc_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; - seencompressed = 0; - for(i = 1; i < ehdr.e_shnum; i++) { - sh = &shdr[i]; - if (sh->sh_type == SHT_SYMTAB) { - if (symtab) { - tcc_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); - } - if (sh->sh_flags & SHF_COMPRESSED) - seencompressed = 1; - } - - /* 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 = (char *) 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 && - sh->sh_type != SHT_PREINIT_ARRAY && - sh->sh_type != SHT_INIT_ARRAY && - sh->sh_type != SHT_FINI_ARRAY && - strcmp(sh_name, ".stabstr") - ) - continue; - if (seencompressed - && (!strncmp(sh_name, ".debug_", sizeof(".debug_")-1) - || (sh->sh_type == SHT_RELX - && !strncmp((char*)strsec + shdr[sh->sh_info].sh_name, - ".debug_", sizeof(".debug_")-1)))) - 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 & ~SHF_GROUP); - /* 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) { - tcc_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 = (char *) 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 = (char *) strtab + sym->st_name; - sym_index = set_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; - for_each_elem(s, (offset / sizeof(*rel)), rel, ElfW_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 -#ifdef TCC_TARGET_ARM - && type != R_ARM_V4BX -#endif - ) { - invalid_reloc: - tcc_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; -#ifdef TCC_TARGET_ARM - /* Jumps and branches from a Thumb code to a PLT entry need - special handling since PLT entries are ARM code. - Unconditional bl instructions referencing PLT entries are - handled by converting these instructions into blx - instructions. Other case of instructions referencing a PLT - entry require to add a Thumb stub before the PLT entry to - switch to ARM mode. We set bit plt_thumb_stub of the - attribute of a symbol to indicate such a case. */ - if (type == R_ARM_THM_JUMP24) - get_sym_attr(s1, sym_index, 1)->plt_thumb_stub = 1; -#endif - } - 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; -} - -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); -} - -static long get_be64(const uint8_t *b) -{ - long long ret = get_be32(b); - ret = (ret << 32) | (unsigned)get_be32(b+4); - return (long)ret; -} - -/* load only the objects which resolve undefined symbols */ -static int tcc_load_alacarte(TCCState *s1, int fd, int size, int entrysize) -{ - long 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 = entrysize == 4 ? get_be32(data) : get_be64(data); - ar_index = data + entrysize; - ar_names = (char *) ar_index + nsyms * entrysize; - - 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 = (entrysize == 4 - ? get_be32(ar_index + i * 4) - : get_be64(ar_index + i * 8)) - + sizeof(ArchiveHeader); - ++bound; - 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 */ -ST_FUNC 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)) { - tcc_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'; - 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, 4); - } else if (!strcmp(ar_name, "/SYM64/")) { - if(s1->alacarte_link) - return tcc_load_alacarte(s1, fd, size, 8); - } else { - ElfW(Ehdr) ehdr; - if (tcc_object_type(fd, &ehdr) == AFF_BINTYPE_REL) { - if (tcc_load_object_file(s1, fd, file_offset) < 0) - return -1; - } - } - lseek(fd, file_offset + size, SEEK_SET); - } - return 0; -} - -#ifndef TCC_TARGET_PE -/* 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) */ -ST_FUNC 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) { - tcc_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 = (char *) 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; - } - } - - /* add the dll and its level */ - dllref = tcc_mallocz(sizeof(DLLReference) + strlen(soname)); - dllref->level = level; - strcpy(dllref->name, soname); - dynarray_add(&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 = (char *) dynstr + sym->st_name; - set_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 = (char *) 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) { - tcc_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 '\\': - ch = handle_eob(); - if (ch != '\\') - goto redo; - /* fall through */ - /* 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 '$': - case '~': - q = name; - parse_name: - for(;;) { - if (!((ch >= 'a' && ch <= 'z') || - (ch >= 'A' && ch <= 'Z') || - (ch >= '0' && ch <= '9') || - strchr("/.-_+=$:\\,~", 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; - } - return c; -} - -static int ld_add_file(TCCState *s1, const char filename[]) -{ - if (filename[0] == '/') { - if (CONFIG_SYSROOT[0] == '\0' - && tcc_add_file_internal(s1, filename, AFF_TYPE_BIN) == 0) - return 0; - filename = tcc_basename(filename); - } - return tcc_add_dll(s1, filename, 0); -} - -static inline int new_undef_syms(void) -{ - int ret = 0; - ret = new_undef_sym; - new_undef_sym = 0; - return ret; -} - -static int ld_add_file_list(TCCState *s1, const char *cmd, int as_needed) -{ - char filename[1024], libname[1024]; - int t, group, nblibs = 0, ret = 0; - char **libs = NULL; - - group = !strcmp(cmd, "GROUP"); - if (!as_needed) - new_undef_syms(); - t = ld_next(s1, filename, sizeof(filename)); - if (t != '(') - expect("("); - t = ld_next(s1, filename, sizeof(filename)); - for(;;) { - libname[0] = '\0'; - if (t == LD_TOK_EOF) { - tcc_error_noabort("unexpected end of file"); - ret = -1; - goto lib_parse_error; - } else if (t == ')') { - break; - } else if (t == '-') { - t = ld_next(s1, filename, sizeof(filename)); - if ((t != LD_TOK_NAME) || (filename[0] != 'l')) { - tcc_error_noabort("library name expected"); - ret = -1; - goto lib_parse_error; - } - pstrcpy(libname, sizeof libname, &filename[1]); - if (s1->static_link) { - snprintf(filename, sizeof filename, "lib%s.a", libname); - } else { - snprintf(filename, sizeof filename, "lib%s.so", libname); - } - } else if (t != LD_TOK_NAME) { - tcc_error_noabort("filename expected"); - ret = -1; - goto lib_parse_error; - } - if (!strcmp(filename, "AS_NEEDED")) { - ret = ld_add_file_list(s1, cmd, 1); - if (ret) - goto lib_parse_error; - } else { - /* TODO: Implement AS_NEEDED support. Ignore it for now */ - if (!as_needed) { - ret = ld_add_file(s1, filename); - if (ret) - goto lib_parse_error; - if (group) { - /* Add the filename *and* the libname to avoid future conversions */ - dynarray_add(&libs, &nblibs, tcc_strdup(filename)); - if (libname[0] != '\0') - dynarray_add(&libs, &nblibs, tcc_strdup(libname)); - } - } - } - t = ld_next(s1, filename, sizeof(filename)); - if (t == ',') { - t = ld_next(s1, filename, sizeof(filename)); - } - } - if (group && !as_needed) { - while (new_undef_syms()) { - int i; - - for (i = 0; i < nblibs; i ++) - ld_add_file(s1, libs[i]); - } - } -lib_parse_error: - dynarray_reset(&libs, &nblibs); - return ret; -} - -/* interpret a subset of GNU ldscripts to handle the dummy libc.so - files */ -ST_FUNC int tcc_load_ldscript(TCCState *s1) -{ - char cmd[64]; - char filename[1024]; - int t, ret; - - 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, cmd, 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) { - tcc_error_noabort("unexpected end of file"); - return -1; - } else if (t == ')') { - break; - } - } - } else { - return -1; - } - } - return 0; -} -#endif /* !TCC_TARGET_PE */ |