diff options
| author | Uneven Prankster <unevenprankster@protonmail.com> | 2023-10-15 21:28:29 -0300 |
|---|---|---|
| committer | Uneven Prankster <unevenprankster@protonmail.com> | 2023-10-15 21:28:29 -0300 |
| commit | 1c0cc775732201f4c4d3ee0d6772be786b3b4aa1 (patch) | |
| tree | f5d692d046868261275c7430a624c3ea9ed75d3d /tinycc/tccelf.c | |
| parent | a89f892640cf12f75c7ce18e6e88c70a8d3965ed (diff) | |
A lot has certainly happened!
Diffstat (limited to 'tinycc/tccelf.c')
| -rw-r--r-- | tinycc/tccelf.c | 3936 |
1 files changed, 0 insertions, 3936 deletions
diff --git a/tinycc/tccelf.c b/tinycc/tccelf.c deleted file mode 100644 index b46ad4c..0000000 --- a/tinycc/tccelf.c +++ /dev/null @@ -1,3936 +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 */ - -/* elf version information */ -struct sym_version { - char *lib; - char *version; - int out_index; - int prev_same_lib; -}; - -#define nb_sym_versions s1->nb_sym_versions -#define sym_versions s1->sym_versions -#define nb_sym_to_version s1->nb_sym_to_version -#define sym_to_version s1->sym_to_version -#define dt_verneednum s1->dt_verneednum -#define versym_section s1->versym_section -#define verneed_section s1->verneed_section - -/* special flag to indicate that the section should not be linked to the other ones */ -#define SHF_PRIVATE 0x80000000 -/* section is dynsymtab_section */ -#define SHF_DYNSYM 0x40000000 - -#ifdef TCC_TARGET_PE -static const int shf_RELRO = SHF_ALLOC; -static const char rdata[] = ".rdata"; -#else -static const int shf_RELRO = SHF_ALLOC | SHF_WRITE; -static const char rdata[] = ".data.ro"; -#endif - -/* ------------------------------------------------------------------------- */ - -ST_FUNC void tccelf_new(TCCState *s) -{ - TCCState *s1 = 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); - /* create ro data section (make ro after relocation done with GNU_RELRO) */ - rodata_section = new_section(s, rdata, SHT_PROGBITS, shf_RELRO); - 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); - s->symtab = symtab_section; - - /* private symbol table for dynamic symbols */ - s->dynsymtab_section = new_symtab(s, ".dynsymtab", SHT_SYMTAB, SHF_PRIVATE|SHF_DYNSYM, - ".dynstrtab", - ".dynhashtab", SHF_PRIVATE); - get_sym_attr(s, 0, 1); -} - -#ifdef CONFIG_TCC_BCHECK -ST_FUNC void tccelf_bounds_new(TCCState *s) -{ - TCCState *s1 = s; - /* create bounds sections (make ro after relocation done with GNU_RELRO) */ - bounds_section = new_section(s, ".bounds", SHT_PROGBITS, shf_RELRO); - lbounds_section = new_section(s, ".lbounds", SHT_PROGBITS, shf_RELRO); -} -#endif - -static void free_section(Section *s) -{ - tcc_free(s->data); -} - -ST_FUNC void tccelf_delete(TCCState *s1) -{ - int i; - -#ifndef ELF_OBJ_ONLY - /* free symbol versions */ - for (i = 0; i < nb_sym_versions; i++) { - tcc_free(sym_versions[i].version); - tcc_free(sym_versions[i].lib); - } - tcc_free(sym_versions); - tcc_free(sym_to_version); -#endif - - /* 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); - - symtab_section = NULL; /* for tccrun.c:rt_printline() */ -} - -/* save section data state */ -ST_FUNC void tccelf_begin_file(TCCState *s1) -{ - Section *s; int i; - for (i = 1; i < s1->nb_sections; i++) { - s = s1->sections[i]; - s->sh_offset = s->data_offset; - } - /* disable symbol hashing during compilation */ - s = s1->symtab, s->reloc = s->hash, s->hash = NULL; -#if defined TCC_TARGET_X86_64 && defined TCC_TARGET_PE - s1->uw_sym = 0; -#endif -} - -/* At the end of compilation, convert any UNDEF syms to global, and merge - with previously existing symbols */ -ST_FUNC void tccelf_end_file(TCCState *s1) -{ - Section *s = s1->symtab; - int first_sym, nb_syms, *tr, i; - - first_sym = s->sh_offset / sizeof (ElfSym); - nb_syms = s->data_offset / sizeof (ElfSym) - first_sym; - s->data_offset = s->sh_offset; - s->link->data_offset = s->link->sh_offset; - s->hash = s->reloc, s->reloc = NULL; - tr = tcc_mallocz(nb_syms * sizeof *tr); - - for (i = 0; i < nb_syms; ++i) { - ElfSym *sym = (ElfSym*)s->data + first_sym + i; - if (sym->st_shndx == SHN_UNDEF - && ELFW(ST_BIND)(sym->st_info) == STB_LOCAL) - sym->st_info = ELFW(ST_INFO)(STB_GLOBAL, ELFW(ST_TYPE)(sym->st_info)); - tr[i] = set_elf_sym(s, sym->st_value, sym->st_size, sym->st_info, - sym->st_other, sym->st_shndx, (char*)s->link->data + sym->st_name); - } - /* now update relocations */ - for (i = 1; i < s1->nb_sections; i++) { - Section *sr = s1->sections[i]; - if (sr->sh_type == SHT_RELX && sr->link == s) { - ElfW_Rel *rel = (ElfW_Rel*)(sr->data + sr->sh_offset); - ElfW_Rel *rel_end = (ElfW_Rel*)(sr->data + sr->data_offset); - for (; rel < rel_end; ++rel) { - int n = ELFW(R_SYM)(rel->r_info) - first_sym; - if (n < 0) /* zero sym_index in reloc (can happen with asm) */ - continue; - rel->r_info = ELFW(R_INFO)(tr[n], ELFW(R_TYPE)(rel->r_info)); - } - } - } - tcc_free(tr); - - /* record text/data/bss output for -bench info */ - for (i = 0; i < 4; ++i) { - s = s1->sections[i + 1]; - s1->total_output[i] += s->data_offset - s->sh_offset; - } -} - -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)); - sec->s1 = s1; - strcpy(sec->name, name); - sec->sh_type = sh_type; - sec->sh_flags = sh_flags; - switch(sh_type) { - case SHT_GNU_versym: - sec->sh_addralign = 2; - break; - case SHT_HASH: - case SHT_GNU_HASH: - case SHT_REL: - case SHT_RELA: - case SHT_DYNSYM: - case SHT_SYMTAB: - case SHT_DYNAMIC: - case SHT_GNU_verneed: - case SHT_GNU_verdef: - sec->sh_addralign = PTR_SIZE; - 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; -} - -#ifndef ELF_OBJ_ONLY -/* reserve at least 'size' bytes from section start */ -static 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; -} -#endif - -static Section *have_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; - } - return NULL; -} - -/* 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 = have_section(s1, name); - if (sec) - 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); - memmove(ptr, sym, len); - return offset; -} - -/* elf symbol hashing function */ -static ElfW(Word) elf_hash(const unsigned char *name) -{ - ElfW(Word) 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)); - - if (!nb_buckets) - nb_buckets = ((int*)s->hash->data)[0]; - - 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[0]) - 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 *)s->link->data + name_offset) % 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; -} - -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, decorate - name if FORC */ -ST_FUNC addr_t get_sym_addr(TCCState *s1, const char *name, int err, int forc) -{ - int sym_index; - ElfW(Sym) *sym; - char buf[256]; - if (forc && s1->leading_underscore -#ifdef TCC_TARGET_PE - /* win32-32bit stdcall symbols always have _ already */ - && !strchr(name, '@') -#endif - ) { - buf[0] = '_'; - pstrcpy(buf + 1, sizeof(buf) - 1, name); - name = buf; - } - sym_index = find_elf_sym(s1->symtab, name); - sym = &((ElfW(Sym) *)s1->symtab->data)[sym_index]; - if (!sym_index || sym->st_shndx == SHN_UNDEF) { - if (err) - tcc_error_noabort("%s not defined", name); - return (addr_t)-1; - } - return sym->st_value; -} - -/* return elf symbol value */ -LIBTCCAPI void *tcc_get_symbol(TCCState *s, const char *name) -{ - addr_t addr = get_sym_addr(s, name, 0, 1); - return addr == -1 ? NULL : (void*)(uintptr_t)addr; -} - -/* list elf symbol names and values */ -ST_FUNC void list_elf_symbols(TCCState *s, void *ctx, - void (*symbol_cb)(void *ctx, const char *name, const void *val)) -{ - ElfW(Sym) *sym; - Section *symtab; - int sym_index, end_sym; - const char *name; - unsigned char sym_vis, sym_bind; - - symtab = s->symtab; - end_sym = symtab->data_offset / sizeof (ElfSym); - for (sym_index = 0; sym_index < end_sym; ++sym_index) { - sym = &((ElfW(Sym) *)symtab->data)[sym_index]; - if (sym->st_value) { - name = (char *) symtab->link->data + sym->st_name; - sym_bind = ELFW(ST_BIND)(sym->st_info); - sym_vis = ELFW(ST_VISIBILITY)(sym->st_other); - if (sym_bind == STB_GLOBAL && sym_vis == STV_DEFAULT) - symbol_cb(ctx, name, (void*)(uintptr_t)sym->st_value); - } - } -} - -/* list elf symbol names and values */ -LIBTCCAPI void tcc_list_symbols(TCCState *s, void *ctx, - void (*symbol_cb)(void *ctx, const char *name, const void *val)) -{ - list_elf_symbols(s, ctx, symbol_cb); -} - -#ifndef ELF_OBJ_ONLY -static void -version_add (TCCState *s1) -{ - int i; - ElfW(Sym) *sym; - ElfW(Verneed) *vn = NULL; - Section *symtab; - int sym_index, end_sym, nb_versions = 2, nb_entries = 0; - ElfW(Half) *versym; - const char *name; - - if (0 == nb_sym_versions) - return; - versym_section = new_section(s1, ".gnu.version", SHT_GNU_versym, SHF_ALLOC); - versym_section->sh_entsize = sizeof(ElfW(Half)); - versym_section->link = s1->dynsym; - - /* add needed symbols */ - symtab = s1->dynsym; - end_sym = symtab->data_offset / sizeof (ElfSym); - versym = section_ptr_add(versym_section, end_sym * sizeof(ElfW(Half))); - for (sym_index = 1; sym_index < end_sym; ++sym_index) { - int dllindex, verndx; - sym = &((ElfW(Sym) *)symtab->data)[sym_index]; - if (sym->st_shndx != SHN_UNDEF) - continue; /* defined symbol doesn't need library version */ - name = (char *) symtab->link->data + sym->st_name; - dllindex = find_elf_sym(s1->dynsymtab_section, name); - verndx = (dllindex && dllindex < nb_sym_to_version) - ? sym_to_version[dllindex] : -1; - if (verndx >= 0) { - if (!sym_versions[verndx].out_index) - sym_versions[verndx].out_index = nb_versions++; - versym[sym_index] = sym_versions[verndx].out_index; - } - } - /* generate verneed section, but not when it will be empty. Some - dynamic linkers look at their contents even when DTVERNEEDNUM and - section size is zero. */ - if (nb_versions > 2) { - verneed_section = new_section(s1, ".gnu.version_r", - SHT_GNU_verneed, SHF_ALLOC); - verneed_section->link = s1->dynsym->link; - for (i = nb_sym_versions; i-- > 0;) { - struct sym_version *sv = &sym_versions[i]; - int n_same_libs = 0, prev; - size_t vnofs; - ElfW(Vernaux) *vna = 0; - if (sv->out_index < 1) - continue; - - /* make sure that a DT_NEEDED tag is put */ - /* abitest-tcc fails on older i386-linux with "ld-linux.so.2" DT_NEEDED - ret_int_test... Inconsistency detected by ld.so: dl-minimal.c: 148: - realloc: Assertion `ptr == alloc_last_block' failed! */ - if (strcmp(sv->lib, "ld-linux.so.2")) - tcc_add_dllref(s1, sv->lib, 0); - - vnofs = section_add(verneed_section, sizeof(*vn), 1); - vn = (ElfW(Verneed)*)(verneed_section->data + vnofs); - vn->vn_version = 1; - vn->vn_file = put_elf_str(verneed_section->link, sv->lib); - vn->vn_aux = sizeof (*vn); - do { - prev = sv->prev_same_lib; - if (sv->out_index > 0) { - vna = section_ptr_add(verneed_section, sizeof(*vna)); - vna->vna_hash = elf_hash ((const unsigned char *)sv->version); - vna->vna_flags = 0; - vna->vna_other = sv->out_index; - sv->out_index = -2; - vna->vna_name = put_elf_str(verneed_section->link, sv->version); - vna->vna_next = sizeof (*vna); - n_same_libs++; - } - if (prev >= 0) - sv = &sym_versions[prev]; - } while(prev >= 0); - vna->vna_next = 0; - vn = (ElfW(Verneed)*)(verneed_section->data + vnofs); - vn->vn_cnt = n_same_libs; - vn->vn_next = sizeof(*vn) + n_same_libs * sizeof(*vna); - nb_entries++; - } - if (vn) - vn->vn_next = 0; - verneed_section->sh_info = nb_entries; - } - dt_verneednum = nb_entries; -} -#endif /* ndef ELF_OBJ_ONLY */ - -/* 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) -{ - TCCState *s1 = s->s1; - 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_value == value && esym->st_size == size && esym->st_info == info - && esym->st_other == other && esym->st_shndx == shndx) - return 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; - 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->sh_flags & SHF_DYNSYM) { - /* we accept that two DLL define the same symbol */ - } else if (esym->st_other & ST_ASM_SET) { - /* If the existing symbol came from an asm .set - we can override. */ - goto do_patch; - } 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 { - esym->st_other = other; - do_patch: - esym->st_info = ELFW(ST_INFO)(sym_bind, sym_type); - esym->st_shndx = shndx; - s1->new_undef_sym = 1; - esym->st_value = value; - esym->st_size = size; - } - } 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) -{ - TCCState *s1 = s->s1; - 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(s->s1, 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; -#endif - if (SHT_RELX != SHT_RELA && addend) - tcc_error_noabort("non-zero addend on REL architecture"); -} - -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); -} - -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]; -} - -static void modify_reloctions_old_to_new(TCCState *s1, Section *s, int *old_to_new_syms) -{ - int i, type, sym_index; - Section *sr; - ElfW_Rel *rel; - - 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); - } - } - } -} - -/* 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; - - 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); - - modify_reloctions_old_to_new(s1, s, old_to_new_syms); - - tcc_free(old_to_new_syms); -} - -#ifndef ELF_OBJ_ONLY -/* See: https://flapenguin.me/elf-dt-gnu-hash */ -#define ELFCLASS_BITS (PTR_SIZE * 8) - -static Section *create_gnu_hash(TCCState *s1) -{ - int nb_syms, i, ndef, nbuckets, symoffset, bloom_size, bloom_shift; - ElfW(Sym) *p; - Section *gnu_hash; - Section *dynsym = s1->dynsym; - Elf32_Word *ptr; - - gnu_hash = new_section(s1, ".gnu.hash", SHT_GNU_HASH, SHF_ALLOC); - gnu_hash->link = dynsym->hash->link; - - nb_syms = dynsym->data_offset / sizeof(ElfW(Sym)); - - /* count def symbols */ - ndef = 0; - p = (ElfW(Sym) *)dynsym->data; - for(i = 0; i < nb_syms; i++, p++) - ndef += p->st_shndx != SHN_UNDEF; - - /* calculate gnu hash sizes and fill header */ - nbuckets = ndef / 4 + 1; - symoffset = nb_syms - ndef; - bloom_shift = PTR_SIZE == 8 ? 6 : 5; - bloom_size = 1; /* must be power of two */ - while (ndef >= bloom_size * (1 << (bloom_shift - 3))) - bloom_size *= 2; - ptr = section_ptr_add(gnu_hash, 4 * 4 + - PTR_SIZE * bloom_size + - nbuckets * 4 + - ndef * 4); - ptr[0] = nbuckets; - ptr[1] = symoffset; - ptr[2] = bloom_size; - ptr[3] = bloom_shift; - return gnu_hash; -} - -static Elf32_Word elf_gnu_hash (const unsigned char *name) -{ - Elf32_Word h = 5381; - unsigned char c; - - while ((c = *name++)) - h = h * 33 + c; - return h; -} - -static void update_gnu_hash(TCCState *s1, Section *gnu_hash) -{ - int *old_to_new_syms; - ElfW(Sym) *new_syms; - int nb_syms, i, nbuckets, bloom_size, bloom_shift; - ElfW(Sym) *p, *q; - Section *vs; - Section *dynsym = s1->dynsym; - Elf32_Word *ptr, *buckets, *chain, *hash; - unsigned int *nextbuck; - addr_t *bloom; - unsigned char *strtab; - struct { int first, last; } *buck; - - strtab = dynsym->link->data; - nb_syms = dynsym->data_offset / sizeof(ElfW(Sym)); - new_syms = tcc_malloc(nb_syms * sizeof(ElfW(Sym))); - old_to_new_syms = tcc_malloc(nb_syms * sizeof(int)); - hash = tcc_malloc(nb_syms * sizeof(Elf32_Word)); - nextbuck = tcc_malloc(nb_syms * sizeof(int)); - - /* calculate hashes and copy undefs */ - p = (ElfW(Sym) *)dynsym->data; - q = new_syms; - for(i = 0; i < nb_syms; i++, p++) { - if (p->st_shndx == SHN_UNDEF) { - old_to_new_syms[i] = q - new_syms; - *q++ = *p; - } - else - hash[i] = elf_gnu_hash(strtab + p->st_name); - } - - ptr = (Elf32_Word *) gnu_hash->data; - nbuckets = ptr[0]; - bloom_size = ptr[2]; - bloom_shift = ptr[3]; - bloom = (addr_t *) (void *) &ptr[4]; - buckets = (Elf32_Word*) (void *) &bloom[bloom_size]; - chain = &buckets[nbuckets]; - buck = tcc_malloc(nbuckets * sizeof(*buck)); - - if (gnu_hash->data_offset != 4 * 4 + - PTR_SIZE * bloom_size + - nbuckets * 4 + - (nb_syms - (q - new_syms)) * 4) - tcc_error_noabort ("gnu_hash size incorrect"); - - /* find buckets */ - for(i = 0; i < nbuckets; i++) - buck[i].first = -1; - - p = (ElfW(Sym) *)dynsym->data; - for(i = 0; i < nb_syms; i++, p++) - if (p->st_shndx != SHN_UNDEF) { - int bucket = hash[i] % nbuckets; - - if (buck[bucket].first == -1) - buck[bucket].first = buck[bucket].last = i; - else { - nextbuck[buck[bucket].last] = i; - buck[bucket].last = i; - } - } - - /* fill buckets/chains/bloom and sort symbols */ - p = (ElfW(Sym) *)dynsym->data; - for(i = 0; i < nbuckets; i++) { - int cur = buck[i].first; - - if (cur != -1) { - buckets[i] = q - new_syms; - for (;;) { - old_to_new_syms[cur] = q - new_syms; - *q++ = p[cur]; - *chain++ = hash[cur] & ~1; - bloom[(hash[cur] / ELFCLASS_BITS) % bloom_size] |= - (addr_t)1 << (hash[cur] % ELFCLASS_BITS) | - (addr_t)1 << ((hash[cur] >> bloom_shift) % ELFCLASS_BITS); - if (cur == buck[i].last) - break; - cur = nextbuck[cur]; - } - chain[-1] |= 1; - } - } - - memcpy(dynsym->data, new_syms, nb_syms * sizeof(ElfW(Sym))); - tcc_free(new_syms); - tcc_free(hash); - tcc_free(buck); - tcc_free(nextbuck); - - modify_reloctions_old_to_new(s1, dynsym, old_to_new_syms); - - /* modify the versions */ - vs = versym_section; - if (vs) { - ElfW(Half) *newver, *versym = (ElfW(Half) *)vs->data; - - if (1/*versym*/) { - newver = tcc_malloc(nb_syms * sizeof(*newver)); - for (i = 0; i < nb_syms; i++) - newver[old_to_new_syms[i]] = versym[i]; - memcpy(vs->data, newver, nb_syms * sizeof(*newver)); - tcc_free(newver); - } - } - - tcc_free(old_to_new_syms); - - /* rebuild hash */ - ptr = (Elf32_Word *) dynsym->hash->data; - rebuild_hash(dynsym, ptr[0]); -} -#endif /* ELF_OBJ_ONLY */ - -/* 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) { - if (do_resolve == 2) /* relocating dynsym */ - continue; - name = (char *) s1->symtab->link->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 - /* dlsym() needs the undecorated name. */ - void *addr = dlsym(RTLD_DEFAULT, &name[s1->leading_underscore]); -#if TARGETOS_OpenBSD || TARGETOS_FreeBSD || TARGETOS_NetBSD || TARGETOS_ANDROID - if (addr == NULL) { - int i; - for (i = 0; i < s1->nb_loaded_dlls; i++) - if ((addr = dlsym(s1->loaded_dlls[i]->handle, name))) - break; - } -#endif - 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 */ -static void relocate_section(TCCState *s1, Section *s, Section *sr) -{ - ElfW_Rel *rel; - ElfW(Sym) *sym; - int type, sym_index; - unsigned char *ptr; - addr_t tgt, addr; - int is_dwarf = s->sh_num >= s1->dwlo && s->sh_num < s1->dwhi; - - qrel = (ElfW_Rel *)sr->data; - 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 - if (is_dwarf && type == R_DATA_32DW - && sym->st_shndx >= s1->dwlo && sym->st_shndx < s1->dwhi) { - /* dwarf section relocation to each other */ - add32le(ptr, tgt - s1->sections[sym->st_shndx]->sh_addr); - continue; - } - addr = s->sh_addr + rel->r_offset; - relocate(s1, rel, type, ptr, addr, tgt); - } -#ifndef ELF_OBJ_ONLY - /* if the relocation is allocated, we change its symbol table */ - if (sr->sh_flags & SHF_ALLOC) { - sr->link = s1->dynsym; - if (s1->output_type & TCC_OUTPUT_DYN) { - size_t r = (uint8_t*)qrel - sr->data; - if (sizeof ((Stab_Sym*)0)->n_value < PTR_SIZE - && 0 == strcmp(s->name, ".stab")) - r = 0; /* cannot apply 64bit relocation to 32bit value */ - sr->data_offset = sr->sh_size = r; -#ifdef CONFIG_TCC_PIE - if (r && 0 == (s->sh_flags & SHF_WRITE)) - tcc_warning("%d relocations to ro-section %s", (unsigned)(r / sizeof *qrel), s->name); -#endif - } - } -#endif -} - -/* relocate all sections */ -ST_FUNC void relocate_sections(TCCState *s1) -{ - int i; - Section *s, *sr; - - for (i = 1; i < s1->nb_sections; ++i) { - sr = s1->sections[i]; - if (sr->sh_type != SHT_RELX) - continue; - s = s1->sections[sr->sh_info]; -#ifndef TCC_TARGET_MACHO - if (s != s1->got - || s1->static_link - || s1->output_type == TCC_OUTPUT_MEMORY) -#endif - { - relocate_section(s1, s, sr); - } -#ifndef ELF_OBJ_ONLY - if (sr->sh_flags & SHF_ALLOC) { - ElfW_Rel *rel; - /* relocate relocation table in 'sr' */ - for_each_elem(sr, 0, rel, ElfW_Rel) - rel->r_offset += s->sh_addr; - } -#endif - } -} - -#ifndef ELF_OBJ_ONLY -/* count the number of dynamic relocations so that we can reserve - their space */ -static int prepare_dynamic_rel(TCCState *s1, Section *sr) -{ - int count = 0; -#if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64) || \ - defined(TCC_TARGET_ARM) || defined(TCC_TARGET_ARM64) || \ - defined(TCC_TARGET_RISCV64) - ElfW_Rel *rel; - for_each_elem(sr, 0, rel, ElfW_Rel) { - int sym_index = ELFW(R_SYM)(rel->r_info); - int 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: -#elif defined(TCC_TARGET_ARM) - case R_ARM_ABS32: - case R_ARM_TARGET1: -#elif defined(TCC_TARGET_ARM64) - case R_AARCH64_ABS32: - case R_AARCH64_ABS64: -#elif defined(TCC_TARGET_RISCV64) - case R_RISCV_32: - case R_RISCV_64: -#endif - count++; - break; -#if defined(TCC_TARGET_I386) - case R_386_PC32: -#elif defined(TCC_TARGET_X86_64) - case R_X86_64_PC32: - { - ElfW(Sym) *sym = &((ElfW(Sym) *)symtab_section->data)[sym_index]; - /* Hidden defined symbols can and must be resolved locally. - We're misusing a PLT32 reloc for this, as that's always - resolved to its address even in shared libs. */ - if (sym->st_shndx != SHN_UNDEF && - ELFW(ST_VISIBILITY)(sym->st_other) == STV_HIDDEN) { - rel->r_info = ELFW(R_INFO)(sym_index, R_X86_64_PLT32); - break; - } - } -#elif defined(TCC_TARGET_ARM64) - case R_AARCH64_PREL32: -#endif - if (s1->output_type != TCC_OUTPUT_DLL) - break; - if (get_sym_attr(s1, sym_index, 0)->dyn_index) - count++; - break; - default: - break; - } - } -#endif - return count; -} -#endif - -#ifdef NEED_BUILD_GOT -static int 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; - /* keep space for _DYNAMIC pointer and two dummy got entries */ - section_ptr_add(s1->got, 3 * PTR_SIZE); - return set_elf_sym(symtab_section, 0, 0, ELFW(ST_INFO)(STB_GLOBAL, STT_OBJECT), - 0, s1->got->sh_num, "_GLOBAL_OFFSET_TABLE_"); -} - -/* 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, - int sym_index) -{ - int need_plt_entry; - const char *name; - ElfW(Sym) *sym; - struct sym_attr *attr; - unsigned got_offset; - char plt_name[200]; - int len; - Section *s_rel; - - 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; - - s_rel = s1->got; - if (need_plt_entry) { - if (!s1->plt) { - s1->plt = new_section(s1, ".plt", SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR); - s1->plt->sh_entsize = 4; - } - s_rel = s1->plt; - } - - /* 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; - //printf("sym %d %s\n", need_plt_entry, 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, - sym->st_size, sym->st_info, 0, - sym->st_shndx, name); - put_elf_reloc(s1->dynsym, s_rel, 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) { - 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, 0, - 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 */ -/* Two passes because R_JMP_SLOT should become first. Some targets - (arm, arm64) do not allow mixing R_JMP_SLOT and R_GLOB_DAT. */ -ST_FUNC void build_got_entries(TCCState *s1, int got_sym) -{ - Section *s; - ElfW_Rel *rel; - ElfW(Sym) *sym; - int i, type, gotplt_entry, reloc_type, sym_index; - struct sym_attr *attr; - int pass = 0; -redo: - 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); - if (gotplt_entry == -1) { - tcc_error_noabort ("Unknown relocation type for got: %d", type); - continue; - } - 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 (!PCRELATIVE_DLLPLT - && (s1->output_type & TCC_OUTPUT_DYN)) - 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) { - if (sym->st_value == 0) /* from tcc_add_btstub() */ - continue; -#ifndef TCC_TARGET_ARM - if (PTR_SIZE != 8) - continue; -#endif - /* from tcc_add_symbol(): on 64 bit platforms these - need to go through .got */ - } else - continue; - } - -#ifdef TCC_TARGET_X86_64 - if ((type == R_X86_64_PLT32 || type == R_X86_64_PC32) && - sym->st_shndx != SHN_UNDEF && - (ELFW(ST_VISIBILITY)(sym->st_other) != STV_DEFAULT || - ELFW(ST_BIND)(sym->st_info) == STB_LOCAL || - s1->output_type & TCC_OUTPUT_EXE)) { - if (pass != 0) - continue; - rel->r_info = ELFW(R_INFO)(sym_index, R_X86_64_PC32); - continue; - } -#endif - reloc_type = code_reloc(type); - if (reloc_type == -1) { - tcc_error_noabort ("Unknown relocation type: %d", type); - continue; - } - - if (reloc_type != 0) { - jmp_slot: - if (pass != 0) - continue; - reloc_type = R_JMP_SLOT; - } else { - if (pass != 1) - continue; - reloc_type = R_GLOB_DAT; - } - - if (!s1->got) - got_sym = build_got(s1); - - if (gotplt_entry == BUILD_GOT_ONLY) - continue; - - attr = put_got_entry(s1, reloc_type, sym_index); - - if (reloc_type == R_JMP_SLOT) - rel->r_info = ELFW(R_INFO)(attr->plt_sym, type); - } - } - if (++pass < 2) - goto redo; - /* .rel.plt refers to .got actually */ - if (s1->plt && s1->plt->reloc) - s1->plt->reloc->sh_info = s1->got->sh_num; - if (got_sym) /* set size */ - ((ElfW(Sym)*)symtab_section->data)[got_sym].st_size = s1->got->data_offset; -} -#endif /* def NEED_BUILD_GOT */ - -ST_FUNC int set_global_sym(TCCState *s1, const char *name, Section *sec, addr_t offs) -{ - int shn = sec ? sec->sh_num : offs || !name ? SHN_ABS : SHN_UNDEF; - if (sec && offs == -1) - offs = sec->data_offset; - return set_elf_sym(symtab_section, offs, 0, - ELFW(ST_INFO)(name ? STB_GLOBAL : STB_LOCAL, STT_NOTYPE), 0, shn, name); -} - -static void add_init_array_defines(TCCState *s1, const char *section_name) -{ - Section *s; - addr_t end_offset; - char buf[1024]; - s = have_section(s1, section_name); - if (!s || !(s->sh_flags & SHF_ALLOC)) { - end_offset = 0; - s = data_section; - } else { - end_offset = s->data_offset; - } - snprintf(buf, sizeof(buf), "__%s_start", section_name + 1); - set_global_sym(s1, buf, s, 0); - snprintf(buf, sizeof(buf), "__%s_end", section_name + 1); - set_global_sym(s1, buf, s, end_offset); -} - -ST_FUNC void add_array (TCCState *s1, const char *sec, int c) -{ - Section *s; - s = find_section(s1, sec); - s->sh_flags = shf_RELRO; - s->sh_type = sec[1] == 'i' ? SHT_INIT_ARRAY : SHT_FINI_ARRAY; - put_elf_reloc (s1->symtab, s, s->data_offset, R_DATA_PTR, c); - section_ptr_add(s, PTR_SIZE); -} - -#ifdef CONFIG_TCC_BCHECK -ST_FUNC void tcc_add_bcheck(TCCState *s1) -{ - if (0 == s1->do_bounds_check) - return; - section_ptr_add(bounds_section, sizeof(addr_t)); -} -#endif - -/* set symbol to STB_LOCAL and resolve. The point is to not export it as - a dynamic symbol to allow so's to have one each with a different value. */ -static void set_local_sym(TCCState *s1, const char *name, Section *s, int offset) -{ - int c = find_elf_sym(s1->symtab, name); - if (c) { - ElfW(Sym) *esym = (ElfW(Sym)*)s1->symtab->data + c; - esym->st_info = ELFW(ST_INFO)(STB_LOCAL, STT_NOTYPE); - esym->st_value = offset; - esym->st_shndx = s->sh_num; - } -} - -/* avoid generating debug/test_coverage code for stub functions */ -static void tcc_compile_string_no_debug(TCCState *s, const char *str) -{ - int save_do_debug = s->do_debug; - int save_test_coverage = s->test_coverage; - - s->do_debug = 0; - s->test_coverage = 0; - tcc_compile_string(s, str); - s->do_debug = save_do_debug; - s->test_coverage = save_test_coverage; -} - -#ifdef CONFIG_TCC_BACKTRACE -static void put_ptr(TCCState *s1, Section *s, int offs) -{ - int c; - c = set_global_sym(s1, NULL, s, offs); - s = data_section; - put_elf_reloc (s1->symtab, s, s->data_offset, R_DATA_PTR, c); - section_ptr_add(s, PTR_SIZE); -} - -ST_FUNC void tcc_add_btstub(TCCState *s1) -{ - Section *s; - int n, o; - CString cstr; - - s = data_section; - /* Align to PTR_SIZE */ - section_ptr_add(s, -s->data_offset & (PTR_SIZE - 1)); - o = s->data_offset; - /* create (part of) a struct rt_context (see tccrun.c) */ - if (s1->dwarf) { - put_ptr(s1, dwarf_line_section, 0); - put_ptr(s1, dwarf_line_section, -1); - if (s1->dwarf >= 5) - put_ptr(s1, dwarf_line_str_section, 0); - else - put_ptr(s1, dwarf_str_section, 0); - } - else - { - put_ptr(s1, stab_section, 0); - put_ptr(s1, stab_section, -1); - put_ptr(s1, stab_section->link, 0); - } - *(addr_t *)section_ptr_add(s, PTR_SIZE) = s1->dwarf; - /* skip esym_start/esym_end/elf_str (not loaded) */ - section_ptr_add(s, 3 * PTR_SIZE); - /* prog_base : local nameless symbol with offset 0 at SHN_ABS */ - put_ptr(s1, NULL, 0); -#if defined TCC_TARGET_MACHO - /* adjust for __PAGEZERO */ - if (s1->dwarf == 0 && s1->output_type == TCC_OUTPUT_EXE) - write64le(data_section->data + data_section->data_offset - PTR_SIZE, - (uint64_t)1 << 32); -#endif - n = 2 * PTR_SIZE; -#ifdef CONFIG_TCC_BCHECK - if (s1->do_bounds_check) { - put_ptr(s1, bounds_section, 0); - n -= PTR_SIZE; - } -#endif - section_ptr_add(s, n); - cstr_new(&cstr); - cstr_printf(&cstr, - "extern void __bt_init(),__bt_exit(),__bt_init_dll();" - "static void *__rt_info[];" - "__attribute__((constructor)) static void __bt_init_rt(){"); -#ifdef TCC_TARGET_PE - if (s1->output_type == TCC_OUTPUT_DLL) -#ifdef CONFIG_TCC_BCHECK - cstr_printf(&cstr, "__bt_init_dll(%d);", s1->do_bounds_check); -#else - cstr_printf(&cstr, "__bt_init_dll(0);"); -#endif -#endif - cstr_printf(&cstr, "__bt_init(__rt_info,%d);}", - s1->output_type == TCC_OUTPUT_DLL ? 0 : s1->rt_num_callers + 1); - /* In case dlcose is called by application */ - cstr_printf(&cstr, - "__attribute__((destructor)) static void __bt_exit_rt(){" - "__bt_exit(__rt_info);}"); - tcc_compile_string_no_debug(s1, cstr.data); - cstr_free(&cstr); - set_local_sym(s1, &"___rt_info"[!s1->leading_underscore], s, o); -} -#endif /* def CONFIG_TCC_BACKTRACE */ - -static void tcc_tcov_add_file(TCCState *s1, const char *filename) -{ - CString cstr; - void *ptr; - char wd[1024]; - - if (tcov_section == NULL) - return; - section_ptr_add(tcov_section, 1); - write32le (tcov_section->data, tcov_section->data_offset); - - cstr_new (&cstr); - if (filename[0] == '/') - cstr_printf (&cstr, "%s.tcov", filename); - else { - getcwd (wd, sizeof(wd)); - cstr_printf (&cstr, "%s/%s.tcov", wd, filename); - } - ptr = section_ptr_add(tcov_section, cstr.size + 1); - strcpy((char *)ptr, cstr.data); - unlink((char *)ptr); -#ifdef _WIN32 - normalize_slashes((char *)ptr); -#endif - cstr_free (&cstr); - - cstr_new(&cstr); - cstr_printf(&cstr, - "extern char *__tcov_data[];" - "extern void __store_test_coverage ();" - "__attribute__((destructor)) static void __tcov_exit() {" - "__store_test_coverage(__tcov_data);" - "}"); - tcc_compile_string_no_debug(s1, cstr.data); - cstr_free(&cstr); - set_local_sym(s1, &"___tcov_data"[!s1->leading_underscore], tcov_section, 0); -} - -#ifndef TCC_TARGET_PE -/* add tcc runtime libraries */ -ST_FUNC void tcc_add_runtime(TCCState *s1) -{ - s1->filetype = 0; - -#ifdef CONFIG_TCC_BCHECK - tcc_add_bcheck(s1); -#endif - tcc_add_pragma_libs(s1); - - /* add libc */ - if (!s1->nostdlib) { - int lpthread = s1->option_pthread; - -#ifdef CONFIG_TCC_BCHECK - if (s1->do_bounds_check && s1->output_type != TCC_OUTPUT_DLL) { - tcc_add_support(s1, "bcheck.o"); -# if !(TARGETOS_OpenBSD || TARGETOS_NetBSD) - tcc_add_library_err(s1, "dl"); -# endif - lpthread = 1; - } -#endif -#ifdef CONFIG_TCC_BACKTRACE - if (s1->do_backtrace) { - if (s1->output_type & TCC_OUTPUT_EXE) - tcc_add_support(s1, "bt-exe.o"); - if (s1->output_type != TCC_OUTPUT_DLL) - tcc_add_support(s1, "bt-log.o"); - if (s1->output_type != TCC_OUTPUT_MEMORY) - tcc_add_btstub(s1); - } -#endif - if (lpthread) - tcc_add_library_err(s1, "pthread"); - 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 -#if defined TCC_TARGET_ARM && TARGETOS_FreeBSD - tcc_add_library_err(s1, "gcc_s"); // unwind code -#endif - if (TCC_LIBTCC1[0]) - tcc_add_support(s1, TCC_LIBTCC1); - - /* add crt end if not memory output */ - if (s1->output_type != TCC_OUTPUT_MEMORY) { -#if defined TCC_TARGET_MACHO - /* nothing to do */ -#elif TARGETOS_FreeBSD || TARGETOS_NetBSD - if (s1->output_type & TCC_OUTPUT_DYN) - tcc_add_crt(s1, "crtendS.o"); - else - tcc_add_crt(s1, "crtend.o"); - tcc_add_crt(s1, "crtn.o"); -#elif TARGETOS_OpenBSD - if (s1->output_type == TCC_OUTPUT_DLL) - tcc_add_crt(s1, "crtendS.o"); - else - tcc_add_crt(s1, "crtend.o"); -#elif TARGETOS_ANDROID - if (s1->output_type == TCC_OUTPUT_DLL) - tcc_add_crt(s1, "crtend_so.o"); - else - tcc_add_crt(s1, "crtend_android.o"); -#else - tcc_add_crt(s1, "crtn.o"); -#endif - } - } -} -#endif /* ndef TCC_TARGET_PE */ - -/* 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; - - set_global_sym(s1, "_etext", text_section, -1); - set_global_sym(s1, "_edata", data_section, -1); - set_global_sym(s1, "_end", bss_section, -1); -#if TARGETOS_OpenBSD - set_global_sym(s1, "__executable_start", NULL, ELF_START_ADDR); -#endif -#ifdef TCC_TARGET_RISCV64 - /* XXX should be .sdata+0x800, not .data+0x800 */ - set_global_sym(s1, "__global_pointer$", data_section, 0x800); -#endif - /* 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_flags & SHF_ALLOC) - && (s->sh_type == SHT_PROGBITS - || s->sh_type == SHT_STRTAB)) { - const char *p; - /* check if section name can be expressed in C */ - p = s->name; - for(;;) { - int c = *p; - if (!c) - break; - if (!isid(c) && !isnum(c)) - goto next_sec; - p++; - } - snprintf(buf, sizeof(buf), "__start_%s", s->name); - set_global_sym(s1, buf, s, 0); - snprintf(buf, sizeof(buf), "__stop_%s", s->name); - set_global_sym(s1, buf, s, -1); - } - next_sec: ; - } -} - -ST_FUNC void resolve_common_syms(TCCState *s1) -{ - ElfW(Sym) *sym; - - /* Allocate common symbols in BSS. */ - 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; - } - } - - /* Now assign linker provided symbols their value. */ - tcc_add_linker_symbols(s1); -} - -#ifndef ELF_OBJ_ONLY -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); -#if PTR_SIZE == 8 - 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; - if (!s1->got->reloc) - return; - 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("fill_local_got_entries: 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 */ -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); - } - } - } - } -} - -/* 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. With -rdynamic, export all defined symbols */ -static void bind_libs_dynsyms(TCCState *s1) -{ - const char *name; - int dynsym_index; - ElfW(Sym) *sym, *esym; - - for_each_elem(symtab_section, 1, sym, ElfW(Sym)) { - name = (char *)symtab_section->link->data + sym->st_name; - dynsym_index = find_elf_sym(s1->dynsymtab_section, name); - if (sym->st_shndx != SHN_UNDEF - && ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) { - if (dynsym_index || s1->rdynamic) - set_elf_sym(s1->dynsym, sym->st_value, sym->st_size, - sym->st_info, 0, sym->st_shndx, name); - } else if (dynsym_index) { - esym = (ElfW(Sym) *)s1->dynsymtab_section->data + dynsym_index; - 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 = set_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; - } - } -} - -/* decide if an unallocated section should be output. */ -static int set_sec_sizes(TCCState *s1) -{ - int i; - Section *s; - int textrel = 0; - int file_type = s1->output_type; - - /* Allocate strings for section names */ - for(i = 1; i < s1->nb_sections; i++) { - s = s1->sections[i]; - if (s->sh_type == SHT_RELX && !(s->sh_flags & SHF_ALLOC)) { - /* when generating a DLL, we include relocations but - we may patch them */ - if ((file_type & TCC_OUTPUT_DYN) - && (s1->sections[s->sh_info]->sh_flags & SHF_ALLOC)) { - int count = prepare_dynamic_rel(s1, s); - if (count) { - /* allocate the section */ - s->sh_flags |= SHF_ALLOC; - s->sh_size = count * sizeof(ElfW_Rel); - if (!(s1->sections[s->sh_info]->sh_flags & SHF_WRITE)) - textrel += count; - } - } - } else if ((s->sh_flags & SHF_ALLOC) -#ifdef TCC_TARGET_ARM - || s->sh_type == SHT_ARM_ATTRIBUTES -#endif - || s1->do_debug) { - s->sh_size = s->data_offset; - } - -#ifdef TCC_TARGET_ARM - /* XXX: Suppress stack unwinding section. */ - if (s->sh_type == SHT_ARM_EXIDX) { - s->sh_flags = 0; - s->sh_size = 0; - } -#endif - - } - return textrel; -} - -/* various data used under elf_output_file() */ -struct dyn_inf { - Section *dynamic; - Section *dynstr; - struct { - /* Info to be copied in dynamic section */ - unsigned long data_offset; - addr_t rel_addr; - addr_t rel_size; - }; - - ElfW(Phdr) *phdr; - int phnum; - Section *interp; - Section *note; - Section *gnu_hash; - - /* read only segment mapping for GNU_RELRO */ - Section _roinf, *roinf; -}; - -/* 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 */ -static int sort_sections(TCCState *s1, int *sec_order, Section *interp) -{ - Section *s; - int i, j, k, f, f0, n; - int nb_sections = s1->nb_sections; - int *sec_cls = sec_order + nb_sections; - - for (i = 1; i < nb_sections; i++) { - s = s1->sections[i]; - if (s->sh_flags & SHF_ALLOC) { - j = 0x100; - if (s->sh_flags & SHF_WRITE) - j = 0x200; - if (s->sh_flags & SHF_TLS) - j += 0x200; - } else if (s->sh_name) { - j = 0x700; - } else { - j = 0x900; /* no sh_name: won't go to file */ - } - if (s->sh_type == SHT_SYMTAB || s->sh_type == SHT_DYNSYM) { - k = 0x10; - } else if (s->sh_type == SHT_STRTAB && strcmp(s->name, ".stabstr")) { - k = 0x11; - if (i == nb_sections - 1) /* ".shstrtab" assumed to remain last */ - k = 0xff; - } else if (s->sh_type == SHT_HASH || s->sh_type == SHT_GNU_HASH) { - k = 0x12; - } else if (s->sh_type == SHT_RELX) { - k = 0x20; - if (s1->plt && s == s1->plt->reloc) - k = 0x21; - } else if (s->sh_type == SHT_PREINIT_ARRAY) { - k = 0x41; - } else if (s->sh_type == SHT_INIT_ARRAY) { - k = 0x42; - } else if (s->sh_type == SHT_FINI_ARRAY) { - k = 0x43; -#ifdef CONFIG_TCC_BCHECK - } else if (s == bounds_section || s == lbounds_section) { - k = 0x44; -#endif - } else if (s == rodata_section || 0 == strcmp(s->name, ".data.rel.ro")) { - k = 0x45; - } else if (s->sh_type == SHT_DYNAMIC) { - k = 0x46; - } else if (s == s1->got) { - k = 0x47; /* .got as RELRO needs BIND_NOW in DT_FLAGS */ - } else { - k = 0x50; - if (s->sh_type == SHT_NOTE) - k = 0x60; - if (s->sh_flags & SHF_EXECINSTR) - k = 0x70; - if (s->sh_type == SHT_NOBITS) - k = 0x80; - if (s == interp) - k = 0x00; - } - k += j; - - for (n = i; n > 1 && k < (f = sec_cls[n - 1]); --n) - sec_cls[n] = f, sec_order[n] = sec_order[n - 1]; - sec_cls[n] = k, sec_order[n] = i; - } - sec_order[0] = 0; - - /* count PT_LOAD headers needed */ - n = f0 = 0; - for (i = 1; i < nb_sections; i++) { - s = s1->sections[sec_order[i]]; - k = sec_cls[i]; - f = 0; - if (k < 0x700) { - f = s->sh_flags & (SHF_ALLOC|SHF_WRITE|SHF_EXECINSTR|SHF_TLS); -#if TARGETOS_NetBSD - /* NetBSD only supports 2 PT_LOAD sections. - See: https://blog.netbsd.org/tnf/entry/the_first_report_on_lld */ - if ((f & SHF_WRITE) == 0) f |= SHF_EXECINSTR; -#else - if ((k & 0xfff0) == 0x240) /* RELRO sections */ - f |= 1<<4; -#endif - if (f != f0) /* start new header when flags changed or relro */ - f0 = f, ++n, f |= 1<<8; - } - sec_cls[i] = f; - //printf("ph %d sec %02d : %3X %3X %8.2X %04X %s\n", !!f * n, i, f, k, s->sh_type, s->sh_size, s->name); - } - return n; -} - -static ElfW(Phdr) *fill_phdr(ElfW(Phdr) *ph, int type, Section *s) -{ - if (s) { - ph->p_offset = s->sh_offset; - ph->p_vaddr = s->sh_addr; - ph->p_filesz = s->sh_size; - ph->p_align = s->sh_addralign; - } - ph->p_type = type; - ph->p_flags = PF_R; - ph->p_paddr = ph->p_vaddr; - ph->p_memsz = ph->p_filesz; - return ph; -} - -/* 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, int *sec_order, struct dyn_inf *d) -{ - Section *s; - addr_t addr, tmp, align, s_align, base; - ElfW(Phdr) *ph = NULL; - int i, f, n, phnum, phfill; - int file_offset; - - /* compute number of program headers */ - phnum = sort_sections(s1, sec_order, d->interp); - phfill = 0; /* set to 1 to have dll's with a PT_PHDR */ - if (d->interp) - phfill = 2; - phnum += phfill; - if (d->note) - ++phnum; - if (d->dynamic) - ++phnum; - if (d->roinf) - ++phnum; - d->phnum = phnum; - d->phdr = tcc_mallocz(phnum * sizeof(ElfW(Phdr))); - - 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; - - addr = ELF_START_ADDR; - if (s1->output_type & TCC_OUTPUT_DYN) - addr = 0; - - if (s1->has_text_addr) { - addr = s1->text_addr; - if (0) { - int a_offset, p_offset; - /* 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); - } - } - base = addr; - /* compute address after headers */ - addr = addr + (file_offset & (s_align - 1)); - - n = 0; - for(i = 1; i < s1->nb_sections; i++) { - s = s1->sections[sec_order[i]]; - f = sec_order[i + s1->nb_sections]; - align = s->sh_addralign - 1; - - if (f == 0) { /* no alloc */ - file_offset = (file_offset + align) & ~align; - s->sh_offset = file_offset; - if (s->sh_type != SHT_NOBITS) - file_offset += s->sh_size; - continue; - } - - if ((f & 1<<8) && n) { - /* different rwx section flags */ - if (s1->output_format == TCC_OUTPUT_FORMAT_ELF) { - /* if in the middle of a page, w e 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 { - align = s_align - 1; - } - } - - tmp = addr; - addr = (addr + align) & ~align; - file_offset += (int)(addr - tmp); - s->sh_offset = file_offset; - s->sh_addr = addr; - - if (f & 1<<8) { - /* set new program header */ - ph = &d->phdr[phfill + n]; - ph->p_type = PT_LOAD; - ph->p_align = s_align; - ph->p_flags = PF_R; - if (f & SHF_WRITE) - ph->p_flags |= PF_W; - if (f & SHF_EXECINSTR) - ph->p_flags |= PF_X; - if (f & SHF_TLS) { - ph->p_type = PT_TLS; - ph->p_align = align + 1; - } - - ph->p_offset = file_offset; - ph->p_vaddr = addr; - if (n == 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 = 0; - ph->p_vaddr = base; - } - ph->p_paddr = ph->p_vaddr; - ++n; - } - - if (f & 1<<4) { - Section *roinf = &d->_roinf; - if (roinf->sh_size == 0) { - roinf->sh_offset = s->sh_offset; - roinf->sh_addr = s->sh_addr; - roinf->sh_addralign = 1; - } - roinf->sh_size = (addr - roinf->sh_addr) + 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; - } - - /* Fill other headers */ - if (d->note) - fill_phdr(++ph, PT_NOTE, d->note); - if (d->dynamic) - fill_phdr(++ph, PT_DYNAMIC, d->dynamic)->p_flags |= PF_W; - if (d->roinf) - fill_phdr(++ph, PT_GNU_RELRO, d->roinf)->p_flags |= PF_W; - if (d->interp) - fill_phdr(&d->phdr[1], PT_INTERP, d->interp); - if (phfill) { - ph = &d->phdr[0]; - ph->p_offset = sizeof(ElfW(Ehdr)); - ph->p_vaddr = base + ph->p_offset; - ph->p_filesz = phnum * sizeof(ElfW(Phdr)); - ph->p_align = 4; - fill_phdr(ph, PT_PHDR, NULL); - } - return file_offset; -} - -/* 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; -} - -/* 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; - Section *s; - - /* put dynamic section entries */ - put_dt(dynamic, DT_HASH, s1->dynsym->hash->sh_addr); - put_dt(dynamic, DT_GNU_HASH, dyninf->gnu_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)); - if (s1->plt && s1->plt->reloc) { - put_dt(dynamic, DT_PLTGOT, s1->got->sh_addr); - put_dt(dynamic, DT_PLTRELSZ, s1->plt->reloc->data_offset); - put_dt(dynamic, DT_JMPREL, s1->plt->reloc->sh_addr); - put_dt(dynamic, DT_PLTREL, DT_RELA); - } - put_dt(dynamic, DT_RELACOUNT, 0); -#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)); - if (s1->plt && s1->plt->reloc) { - put_dt(dynamic, DT_PLTGOT, s1->got->sh_addr); - put_dt(dynamic, DT_PLTRELSZ, s1->plt->reloc->data_offset); - put_dt(dynamic, DT_JMPREL, s1->plt->reloc->sh_addr); - put_dt(dynamic, DT_PLTREL, DT_REL); - } - put_dt(dynamic, DT_RELCOUNT, 0); -#endif - if (versym_section && verneed_section) { - /* The dynamic linker can not handle VERSYM without VERNEED */ - put_dt(dynamic, DT_VERSYM, versym_section->sh_addr); - put_dt(dynamic, DT_VERNEED, verneed_section->sh_addr); - put_dt(dynamic, DT_VERNEEDNUM, dt_verneednum); - } - s = have_section(s1, ".preinit_array"); - if (s && s->data_offset) { - put_dt(dynamic, DT_PREINIT_ARRAY, s->sh_addr); - put_dt(dynamic, DT_PREINIT_ARRAYSZ, s->data_offset); - } - s = have_section(s1, ".init_array"); - if (s && s->data_offset) { - put_dt(dynamic, DT_INIT_ARRAY, s->sh_addr); - put_dt(dynamic, DT_INIT_ARRAYSZ, s->data_offset); - } - s = have_section(s1, ".fini_array"); - if (s && s->data_offset) { - put_dt(dynamic, DT_FINI_ARRAY, s->sh_addr); - put_dt(dynamic, DT_FINI_ARRAYSZ, s->data_offset); - } - s = have_section(s1, ".init"); - if (s && s->data_offset) { - put_dt(dynamic, DT_INIT, s->sh_addr); - } - s = have_section(s1, ".fini"); - if (s && s->data_offset) { - put_dt(dynamic, DT_FINI, s->sh_addr); - } - if (s1->do_debug) - put_dt(dynamic, DT_DEBUG, 0); - put_dt(dynamic, DT_NULL, 0); -} - -/* Remove gaps between RELX sections. - These gaps are a result of final_sections_reloc. Here some relocs are removed. - The gaps are then filled with 0 in tcc_output_elf. The 0 is intepreted as - R_...NONE reloc. This does work on most targets but on OpenBSD/arm64 this - is illegal. OpenBSD/arm64 does not support R_...NONE reloc. */ -static void update_reloc_sections(TCCState *s1, struct dyn_inf *dyninf) -{ - int i; - unsigned long file_offset = 0; - Section *s; - Section *relocplt = s1->plt ? s1->plt->reloc : NULL; - - /* dynamic relocation table information, for .dynamic section */ - dyninf->rel_addr = dyninf->rel_size = 0; - - for(i = 1; i < s1->nb_sections; i++) { - s = s1->sections[i]; - if (s->sh_type == SHT_RELX && s != relocplt) { - if (dyninf->rel_size == 0) { - dyninf->rel_addr = s->sh_addr; - file_offset = s->sh_offset; - } - else { - s->sh_addr = dyninf->rel_addr + dyninf->rel_size; - s->sh_offset = file_offset + dyninf->rel_size; - } - dyninf->rel_size += s->sh_size; - } - } -} - -static int tidy_section_headers(TCCState *s1, int *sec_order); -#endif /* ndef ELF_OBJ_ONLY */ - -/* Create an ELF file on disk. - This function handle ELF specific layout requirements */ -static int 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)); -#ifndef ELF_OBJ_ONLY - shnum = tidy_section_headers(s1, sec_order); -#endif - } - - /* 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 TARGETOS_FreeBSD || TARGETOS_FreeBSD_kernel - ehdr.e_ident[EI_OSABI] = ELFOSABI_FREEBSD; -#elif defined TCC_TARGET_ARM && defined TCC_ARM_EABI - ehdr.e_flags = EF_ARM_EABI_VER5; - ehdr.e_flags |= s1->float_abi == ARM_HARD_FLOAT - ? EF_ARM_VFP_FLOAT : EF_ARM_SOFT_FLOAT; -#elif defined TCC_TARGET_ARM - ehdr.e_ident[EI_OSABI] = ELFOSABI_ARM; -#elif defined TCC_TARGET_RISCV64 - ehdr.e_flags = EF_RISCV_FLOAT_ABI_DOUBLE; -#endif - - if (file_type == TCC_OUTPUT_OBJ) { - ehdr.e_type = ET_REL; - } else { - if (file_type & TCC_OUTPUT_DYN) - ehdr.e_type = ET_DYN; - else - ehdr.e_type = ET_EXEC; - if (s1->elf_entryname) - ehdr.e_entry = get_sym_addr(s1, s1->elf_entryname, 1, 0); - else - ehdr.e_entry = get_sym_addr(s1, "_start", !!(file_type & TCC_OUTPUT_EXE), 0); - if (ehdr.e_entry == (addr_t)-1) - ehdr.e_entry = text_section->sh_addr; - if (s1->nb_errors) - return -1; - } - - 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); - if (phdr) - 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 < shnum; i++) { - s = s1->sections[sec_order ? sec_order[i] : 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 < shnum; 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); - } - return 0; -} - -static int 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; - } - } - return 0; -} - -/* 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, ret; - 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 || (f = fdopen(fd, "wb")) == NULL) - return tcc_error_noabort("could not write '%s: %s'", filename, strerror(errno)); - 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) - ret = tcc_output_elf(s1, f, phnum, phdr, file_offset, sec_order); - else - ret = tcc_output_binary(s1, f, sec_order); - fclose(f); - - return ret; -} - -#ifndef ELF_OBJ_ONLY -/* Sort section headers by assigned sh_addr, remove sections - that we aren't going to output. */ -static int 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; - tcc_free(backmap); - return nnew; -} - -#ifdef TCC_TARGET_ARM -static void create_arm_attribute_section(TCCState *s1) -{ - // Needed for DLL support. - static const unsigned char arm_attr[] = { - 0x41, // 'A' - 0x2c, 0x00, 0x00, 0x00, // size 0x2c - 'a', 'e', 'a', 'b', 'i', 0x00, // "aeabi" - 0x01, 0x22, 0x00, 0x00, 0x00, // 'File Attributes', size 0x22 - 0x05, 0x36, 0x00, // 'CPU_name', "6" - 0x06, 0x06, // 'CPU_arch', 'v6' - 0x08, 0x01, // 'ARM_ISA_use', 'Yes' - 0x09, 0x01, // 'THUMB_ISA_use', 'Thumb-1' - 0x0a, 0x02, // 'FP_arch', 'VFPv2' - 0x12, 0x04, // 'ABI_PCS_wchar_t', 4 - 0x14, 0x01, // 'ABI_FP_denormal', 'Needed' - 0x15, 0x01, // 'ABI_FP_exceptions', 'Needed' - 0x17, 0x03, // 'ABI_FP_number_model', 'IEEE 754' - 0x18, 0x01, // 'ABI_align_needed', '8-byte' - 0x19, 0x01, // 'ABI_align_preserved', '8-byte, except leaf SP' - 0x1a, 0x02, // 'ABI_enum_size', 'int' - 0x1c, 0x01, // 'ABI_VFP_args', 'VFP registers' - 0x22, 0x01 // 'CPU_unaligned_access', 'v6' - }; - Section *attr = new_section(s1, ".ARM.attributes", SHT_ARM_ATTRIBUTES, 0); - unsigned char *ptr = section_ptr_add(attr, sizeof(arm_attr)); - attr->sh_addralign = 1; - memcpy(ptr, arm_attr, sizeof(arm_attr)); - if (s1->float_abi != ARM_HARD_FLOAT) { - ptr[26] = 0x00; // 'FP_arch', 'No' - ptr[41] = 0x1e; // 'ABI_optimization_goals' - ptr[42] = 0x06; // 'Aggressive Debug' - } -} -#endif - -#if TARGETOS_OpenBSD || TARGETOS_NetBSD -static Section *create_bsd_note_section(TCCState *s1, - const char *name, - const char *value) -{ - Section *s = find_section (s1, name); - - if (s->data_offset == 0) { - char *ptr = section_ptr_add(s, sizeof(ElfW(Nhdr)) + 8 + 4); - ElfW(Nhdr) *note = (ElfW(Nhdr) *) ptr; - - s->sh_type = SHT_NOTE; - note->n_namesz = 8; - note->n_descsz = 4; - note->n_type = ELF_NOTE_OS_GNU; - strcpy (ptr + sizeof(ElfW(Nhdr)), value); - } - return s; -} -#endif - -static void alloc_sec_names(TCCState *s1, int is_obj); - -/* Output an elf, coff or binary file */ -/* XXX: suppress unneeded sections */ -static int elf_output_file(TCCState *s1, const char *filename) -{ - int i, ret, file_type, file_offset, *sec_order; - struct dyn_inf dyninf = {0}; - Section *interp, *dynstr, *dynamic; - int textrel, got_sym, dt_flags_1; - - file_type = s1->output_type; - s1->nb_errors = 0; - ret = -1; - interp = dynstr = dynamic = NULL; - sec_order = NULL; - dyninf.roinf = &dyninf._roinf; - -#ifdef TCC_TARGET_ARM - create_arm_attribute_section (s1); -#endif - -#if TARGETOS_OpenBSD - dyninf.note = create_bsd_note_section (s1, ".note.openbsd.ident", "OpenBSD"); -#endif - -#if TARGETOS_NetBSD - dyninf.note = create_bsd_note_section (s1, ".note.netbsd.ident", "NetBSD"); -#endif - -#if TARGETOS_FreeBSD || TARGETOS_NetBSD - dyninf.roinf = NULL; -#endif - /* if linking, also link in runtime libraries (libc, libgcc, etc.) */ - tcc_add_runtime(s1); - resolve_common_syms(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); - dyninf.interp = interp; - } - - /* add dynamic symbol table */ - s1->dynsym = new_symtab(s1, ".dynsym", SHT_DYNSYM, SHF_ALLOC, - ".dynstr", - ".hash", SHF_ALLOC); - /* Number of local symbols (readelf complains if not set) */ - s1->dynsym->sh_info = 1; - 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)); - - got_sym = build_got(s1); - if (file_type == TCC_OUTPUT_EXE) { - bind_exe_dynsyms(s1); - if (s1->nb_errors) - goto the_end; - } - build_got_entries(s1, got_sym); - if (file_type & TCC_OUTPUT_EXE) { - bind_libs_dynsyms(s1); - } else { - /* shared library case: simply export all global symbols */ - export_global_syms(s1); - } - dyninf.gnu_hash = create_gnu_hash(s1); - } else { - build_got_entries(s1, 0); - } - version_add (s1); - - textrel = set_sec_sizes(s1); - alloc_sec_names(s1, 0); - - if (!s1->static_link) { - /* 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)); - - dt_flags_1 = DF_1_NOW; - if (file_type & TCC_OUTPUT_DYN) { - 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 (file_type & TCC_OUTPUT_EXE) - dt_flags_1 = DF_1_NOW | DF_1_PIE; - } - put_dt(dynamic, DT_FLAGS, DF_BIND_NOW); - put_dt(dynamic, DT_FLAGS_1, dt_flags_1); - 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; - } - - /* this array is used to reorder sections in the output file */ - sec_order = tcc_malloc(sizeof(int) * 2 * s1->nb_sections); - /* compute section to program header mapping */ - file_offset = layout_sections(s1, sec_order, &dyninf); - - if (dynamic) { - /* 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_DYN))) - relocate_plt(s1); - /* relocate symbols in .dynsym now that final addresses are known */ - relocate_syms(s1, s1->dynsym, 2); - } - - /* if building executable or DLL, then relocate each section - except the GOT which is already relocated */ - relocate_syms(s1, s1->symtab, 0); - if (s1->nb_errors != 0) - goto the_end; - relocate_sections(s1); - if (dynamic) { - update_reloc_sections (s1, &dyninf); - dynamic->data_offset = dyninf.data_offset; - fill_dynamic(s1, &dyninf); - } - /* 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); - - if (dyninf.gnu_hash) - update_gnu_hash(s1, dyninf.gnu_hash); - - /* Create the ELF file with name 'filename' */ - ret = tcc_write_elf_file(s1, filename, dyninf.phnum, dyninf.phdr, file_offset, sec_order); - the_end: - tcc_free(sec_order); - tcc_free(dyninf.phdr); - return ret; -} -#endif /* ndef ELF_OBJ_ONLY */ - -/* Allocate strings for section names */ -static void alloc_sec_names(TCCState *s1, int is_obj) -{ - int i; - Section *s, *strsec; - - strsec = new_section(s1, ".shstrtab", SHT_STRTAB, 0); - put_elf_str(strsec, ""); - for(i = 1; i < s1->nb_sections; i++) { - s = s1->sections[i]; - if (is_obj) - s->sh_size = s->data_offset; - if (s == strsec || s->sh_size || (s->sh_flags & SHF_ALLOC)) - s->sh_name = put_elf_str(strsec, s->name); - } - strsec->sh_size = strsec->data_offset; -} - -/* Output an elf .o file */ -static int elf_output_obj(TCCState *s1, const char *filename) -{ - Section *s; - int i, ret, file_offset; - s1->nb_errors = 0; - /* Allocate strings for section names */ - alloc_sec_names(s1, 1); - file_offset = sizeof (ElfW(Ehdr)); - for(i = 1; i < s1->nb_sections; i++) { - s = s1->sections[i]; - file_offset = (file_offset + 15) & -16; - s->sh_offset = file_offset; - if (s->sh_type != SHT_NOBITS) - file_offset += s->sh_size; - } - /* Create the ELF file with name 'filename' */ - ret = tcc_write_elf_file(s1, filename, 0, NULL, file_offset, NULL); - return ret; -} - -LIBTCCAPI int tcc_output_file(TCCState *s, const char *filename) -{ - if (s->test_coverage) - tcc_tcov_add_file(s, filename); - if (s->output_type == TCC_OUTPUT_OBJ) - return elf_output_obj(s, filename); -#ifdef TCC_TARGET_PE - return pe_output_file(s, filename); -#elif TCC_TARGET_MACHO - return macho_output_file(s, filename); -#else - return elf_output_file(s, filename); -#endif -} - -ST_FUNC ssize_t full_read(int fd, void *buf, size_t count) { - char *cbuf = buf; - size_t rnum = 0; - while (1) { - ssize_t num = read(fd, cbuf, count-rnum); - if (num < 0) return num; - if (num == 0) return rnum; - rnum += num; - cbuf += num; - } -} - -ST_FUNC void *load_data(int fd, unsigned long file_offset, unsigned long size) -{ - void *data; - - data = tcc_malloc(size); - lseek(fd, file_offset, SEEK_SET); - full_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 = full_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; - unsigned long size, offset, offseti; - int i, j, nb_syms, sym_index, ret, seencompressed; - char *strsec, *strtab; - int stab_index, stabstr_index; - int *old_to_new_syms; - char *sh_name, *name; - SectionMergeInfo *sm_table, *sm; - ElfW(Sym) *sym, *symtab; - ElfW_Rel *rel; - Section *s; - - lseek(fd, file_offset, SEEK_SET); - if (tcc_object_type(fd, &ehdr) != AFF_BINTYPE_REL) - goto invalid; - /* test CPU specific stuff */ - if (ehdr.e_ident[5] != ELFDATA2LSB || - ehdr.e_machine != EM_TCC_TARGET) { -invalid: - return tcc_error_noabort("invalid object file"); - } - /* 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; - stab_index = stabstr_index = 0; - ret = -1; - - 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"); - 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]; - if (sh->sh_type == SHT_RELX) - sh = &shdr[sh->sh_info]; - /* ignore sections types we do not handle (plus relocs to those) */ - if (sh->sh_type != SHT_PROGBITS && -#ifdef TCC_ARM_EABI - sh->sh_type != SHT_ARM_EXIDX && -#endif -#if TARGETOS_OpenBSD || TARGETOS_FreeBSD || TARGETOS_NetBSD - sh->sh_type != SHT_X86_64_UNWIND && -#endif - sh->sh_type != SHT_NOTE && - sh->sh_type != SHT_NOBITS && - sh->sh_type != SHT_PREINIT_ARRAY && - sh->sh_type != SHT_INIT_ARRAY && - sh->sh_type != SHT_FINI_ARRAY && - strcmp(strsec + sh->sh_name, ".stabstr") - ) - continue; - if (seencompressed && 0 == strncmp(strsec + sh->sh_name, ".debug_", 7)) - continue; - - sh = &shdr[i]; - sh_name = strsec + sh->sh_name; - 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; - } - if (stab_section) { - if (s == stab_section) - stab_index = i; - if (s == stab_section->link) - stabstr_index = i; - } - 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 -#if TARGETOS_OpenBSD || TARGETOS_FreeBSD || TARGETOS_NetBSD - && strcmp (s->name, ".eh_frame") -#endif - ) { - tcc_error_noabort("invalid section type"); - goto the_end; - } - /* align start of section */ - s->data_offset += -s->data_offset & (sh->sh_addralign - 1); - if (sh->sh_addralign > s->sh_addralign) - s->sh_addralign = sh->sh_addralign; - sm_table[i].offset = s->data_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); - full_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) { - if (a->n_strx) - 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; - } - } - - /* 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 = 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; - size = sh->sh_size; - switch(s->sh_type) { - case SHT_RELX: - /* take relocation offset information */ - offseti = sm_table[sh->sh_info].offset; - for (rel = (ElfW_Rel *) s->data + (offset / sizeof(*rel)); - rel < (ElfW_Rel *) s->data + ((offset + size) / sizeof(*rel)); - 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_table[sh->sh_info].link_once -#ifdef TCC_TARGET_ARM - && type != R_ARM_V4BX -#elif defined TCC_TARGET_RISCV64 - && type != R_RISCV_ALIGN - && type != R_RISCV_RELAX -#endif - ) { - invalid_reloc: - tcc_error_noabort("Invalid relocation entry [%2d] '%s' @ %.8x", - i, strsec + sh->sh_name, (int)rel->r_offset); - goto the_end; - } - 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; - -#define ARFMAG "`\n" - -static unsigned long long get_be(const uint8_t *b, int n) -{ - unsigned long long ret = 0; - while (n) - ret = (ret << 8) | *b++, --n; - return ret; -} - -static int read_ar_header(int fd, int offset, ArchiveHeader *hdr) -{ - char *p, *e; - int len; - lseek(fd, offset, SEEK_SET); - len = full_read(fd, hdr, sizeof(ArchiveHeader)); - if (len != sizeof(ArchiveHeader)) - return len ? -1 : 0; - p = hdr->ar_name; - for (e = p + sizeof hdr->ar_name; e > p && e[-1] == ' ';) - --e; - *e = '\0'; - hdr->ar_size[sizeof hdr->ar_size-1] = 0; - return len; -} - -/* load only the objects which resolve undefined symbols */ -static int tcc_load_alacarte(TCCState *s1, int fd, int size, int entrysize) -{ - int i, bound, nsyms, sym_index, len, ret = -1; - unsigned long long off; - uint8_t *data; - const char *ar_names, *p; - const uint8_t *ar_index; - ElfW(Sym) *sym; - ArchiveHeader hdr; - - data = tcc_malloc(size); - if (full_read(fd, data, size) != size) - goto the_end; - nsyms = get_be(data, entrysize); - 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) { - Section *s = symtab_section; - sym_index = find_elf_sym(s, p); - if (!sym_index) - continue; - sym = &((ElfW(Sym) *)s->data)[sym_index]; - if(sym->st_shndx != SHN_UNDEF) - continue; - off = get_be(ar_index + i * entrysize, entrysize); - len = read_ar_header(fd, off, &hdr); - if (len <= 0 || memcmp(hdr.ar_fmag, ARFMAG, 2)) { - tcc_error_noabort("invalid archive"); - goto the_end; - } - off += len; - if (s1->verbose == 2) - printf(" -> %s\n", hdr.ar_name); - if (tcc_load_object_file(s1, fd, off) < 0) - goto the_end; - ++bound; - } - } 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, int alacarte) -{ - ArchiveHeader hdr; - /* char magic[8]; */ - int size, len; - unsigned long file_offset; - ElfW(Ehdr) ehdr; - - /* skip magic which was already checked */ - /* full_read(fd, magic, sizeof(magic)); */ - file_offset = sizeof ARMAG - 1; - - for(;;) { - len = read_ar_header(fd, file_offset, &hdr); - if (len == 0) - return 0; - if (len < 0) - return tcc_error_noabort("invalid archive"); - file_offset += len; - size = strtol(hdr.ar_size, NULL, 0); - /* align to even */ - size = (size + 1) & ~1; - if (alacarte) { - /* coff symbol table : we handle it */ - if (!strcmp(hdr.ar_name, "/")) - return tcc_load_alacarte(s1, fd, size, 4); - if (!strcmp(hdr.ar_name, "/SYM64/")) - return tcc_load_alacarte(s1, fd, size, 8); - } else if (tcc_object_type(fd, &ehdr) == AFF_BINTYPE_REL) { - if (s1->verbose == 2) - printf(" -> %s\n", hdr.ar_name); - if (tcc_load_object_file(s1, fd, file_offset) < 0) - return -1; - } - file_offset += size; - } -} - -#ifndef ELF_OBJ_ONLY -/* Set LV[I] to the global index of sym-version (LIB,VERSION). Maybe resizes - LV, maybe create a new entry for (LIB,VERSION). */ -static void set_ver_to_ver(TCCState *s1, int *n, int **lv, int i, char *lib, char *version) -{ - while (i >= *n) { - *lv = tcc_realloc(*lv, (*n + 1) * sizeof(**lv)); - (*lv)[(*n)++] = -1; - } - if ((*lv)[i] == -1) { - int v, prev_same_lib = -1; - for (v = 0; v < nb_sym_versions; v++) { - if (strcmp(sym_versions[v].lib, lib)) - continue; - prev_same_lib = v; - if (!strcmp(sym_versions[v].version, version)) - break; - } - if (v == nb_sym_versions) { - sym_versions = tcc_realloc (sym_versions, - (v + 1) * sizeof(*sym_versions)); - sym_versions[v].lib = tcc_strdup(lib); - sym_versions[v].version = tcc_strdup(version); - sym_versions[v].out_index = 0; - sym_versions[v].prev_same_lib = prev_same_lib; - nb_sym_versions++; - } - (*lv)[i] = v; - } -} - -/* Associates symbol SYM_INDEX (in dynsymtab) with sym-version index - VERNDX. */ -static void -set_sym_version(TCCState *s1, int sym_index, int verndx) -{ - if (sym_index >= nb_sym_to_version) { - int newelems = sym_index ? sym_index * 2 : 1; - sym_to_version = tcc_realloc(sym_to_version, - newelems * sizeof(*sym_to_version)); - memset(sym_to_version + nb_sym_to_version, -1, - (newelems - nb_sym_to_version) * sizeof(*sym_to_version)); - nb_sym_to_version = newelems; - } - if (sym_to_version[sym_index] < 0) - sym_to_version[sym_index] = verndx; -} - -struct versym_info { - int nb_versyms; - ElfW(Verdef) *verdef; - ElfW(Verneed) *verneed; - ElfW(Half) *versym; - int nb_local_ver, *local_ver; -}; - - -static void store_version(TCCState *s1, struct versym_info *v, char *dynstr) -{ - char *lib, *version; - uint32_t next; - int i; - -#define DEBUG_VERSION 0 - - if (v->versym && v->verdef) { - ElfW(Verdef) *vdef = v->verdef; - lib = NULL; - do { - ElfW(Verdaux) *verdaux = - (ElfW(Verdaux) *) (((char *) vdef) + vdef->vd_aux); - -#if DEBUG_VERSION - printf ("verdef: version:%u flags:%u index:%u, hash:%u\n", - vdef->vd_version, vdef->vd_flags, vdef->vd_ndx, - vdef->vd_hash); -#endif - if (vdef->vd_cnt) { - version = dynstr + verdaux->vda_name; - - if (lib == NULL) - lib = version; - else - set_ver_to_ver(s1, &v->nb_local_ver, &v->local_ver, vdef->vd_ndx, - lib, version); -#if DEBUG_VERSION - printf (" verdaux(%u): %s\n", vdef->vd_ndx, version); -#endif - } - next = vdef->vd_next; - vdef = (ElfW(Verdef) *) (((char *) vdef) + next); - } while (next); - } - if (v->versym && v->verneed) { - ElfW(Verneed) *vneed = v->verneed; - do { - ElfW(Vernaux) *vernaux = - (ElfW(Vernaux) *) (((char *) vneed) + vneed->vn_aux); - - lib = dynstr + vneed->vn_file; -#if DEBUG_VERSION - printf ("verneed: %u %s\n", vneed->vn_version, lib); -#endif - for (i = 0; i < vneed->vn_cnt; i++) { - if ((vernaux->vna_other & 0x8000) == 0) { /* hidden */ - version = dynstr + vernaux->vna_name; - set_ver_to_ver(s1, &v->nb_local_ver, &v->local_ver, vernaux->vna_other, - lib, version); -#if DEBUG_VERSION - printf (" vernaux(%u): %u %u %s\n", - vernaux->vna_other, vernaux->vna_hash, - vernaux->vna_flags, version); -#endif - } - vernaux = (ElfW(Vernaux) *) (((char *) vernaux) + vernaux->vna_next); - } - next = vneed->vn_next; - vneed = (ElfW(Verneed) *) (((char *) vneed) + next); - } while (next); - } - -#if DEBUG_VERSION - for (i = 0; i < v->nb_local_ver; i++) { - if (v->local_ver[i] > 0) { - printf ("%d: lib: %s, version %s\n", - i, sym_versions[v->local_ver[i]].lib, - sym_versions[v->local_ver[i]].version); - } - } -#endif -} - -/* 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, nb_syms, nb_dts, sym_bind, ret = -1; - ElfW(Sym) *sym, *dynsym; - ElfW(Dyn) *dt, *dynamic; - - char *dynstr; - int sym_index; - const char *name, *soname; - struct versym_info v; - - full_read(fd, &ehdr, sizeof(ehdr)); - - /* test CPU specific stuff */ - if (ehdr.e_ident[5] != ELFDATA2LSB || - ehdr.e_machine != EM_TCC_TARGET) { - return tcc_error_noabort("bad architecture"); - } - - /* 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 */ - memset(&v, 0, sizeof v); - - 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; - case SHT_GNU_verdef: - v.verdef = load_data(fd, sh->sh_offset, sh->sh_size); - break; - case SHT_GNU_verneed: - v.verneed = load_data(fd, sh->sh_offset, sh->sh_size); - break; - case SHT_GNU_versym: - v.nb_versyms = sh->sh_size / sizeof(ElfW(Half)); - v.versym = load_data(fd, sh->sh_offset, sh->sh_size); - break; - default: - break; - } - } - - if (!dynamic) - goto the_end; - - /* 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 */ - if (tcc_add_dllref(s1, soname, level)->found) - goto ret_success; - - if (v.nb_versyms != nb_syms) - tcc_free (v.versym), v.versym = NULL; - else - store_version(s1, &v, dynstr); - - /* 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; - sym_index = set_elf_sym(s1->dynsymtab_section, sym->st_value, sym->st_size, - sym->st_info, sym->st_other, sym->st_shndx, name); - if (v.versym) { - ElfW(Half) vsym = v.versym[i]; - if ((vsym & 0x8000) == 0 && vsym > 0 && vsym < v.nb_local_ver) - set_sym_version(s1, sym_index, v.local_ver[vsym]); - } - } - - for(i = 0, dt = dynamic; i < nb_dts; i++, dt++) - if (dt->d_tag == DT_RPATH) - tcc_add_library_path(s1, dynstr + dt->d_un.d_val); - - /* 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; - if (tcc_add_dllref(s1, name, -1)) - continue; - if (tcc_add_dll(s1, name, AFF_REFERENCED_DLL) < 0) { - ret = tcc_error_noabort("referenced dll '%s' not found", name); - goto the_end; - } - } - } - - ret_success: - ret = 0; - the_end: - tcc_free(dynstr); - tcc_free(dynsym); - tcc_free(dynamic); - tcc_free(shdr); - tcc_free(v.local_ver); - tcc_free(v.verdef); - tcc_free(v.verneed); - tcc_free(v.versym); - return ret; -} - -#define LD_TOK_NAME 256 -#define LD_TOK_EOF (-1) - -static int ld_inp(TCCState *s1) -{ - char b; - if (s1->cc != -1) { - int c = s1->cc; - s1->cc = -1; - return c; - } - if (1 == read(s1->fd, &b, 1)) - return b; - return CH_EOF; -} - -/* return next ld script token */ -static int ld_next(TCCState *s1, char *name, int name_size) -{ - int c, d, ch; - char *q; - - redo: - ch = ld_inp(s1); - switch(ch) { - case ' ': - case '\t': - case '\f': - case '\v': - case '\r': - case '\n': - goto redo; - case '/': - ch = ld_inp(s1); - if (ch == '*') { /* comment */ - for (d = 0;; d = ch) { - ch = ld_inp(s1); - if (ch == CH_EOF || (ch == '/' && d == '*')) - break; - } - goto redo; - } else { - q = name; - *q++ = '/'; - goto parse_name; - } - break; - case '\\': - /* 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; - } - ch = ld_inp(s1); - } - s1->cc = ch; - *q = '\0'; - c = LD_TOK_NAME; - break; - case CH_EOF: - c = LD_TOK_EOF; - break; - default: - c = ch; - 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 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) - s1->new_undef_sym = 0; - t = ld_next(s1, filename, sizeof(filename)); - if (t != '(') { - ret = tcc_error_noabort("( expected"); - goto lib_parse_error; - } - t = ld_next(s1, filename, sizeof(filename)); - for(;;) { - libname[0] = '\0'; - if (t == LD_TOK_EOF) { - ret = tcc_error_noabort("unexpected end of file"); - 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')) { - ret = tcc_error_noabort("library name expected"); - 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) { - ret = tcc_error_noabort("filename expected"); - 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 (s1->new_undef_sym) { - int i; - s1->new_undef_sym = 0; - 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, int fd) -{ - char cmd[64]; - char filename[1024]; - int t, ret; - - s1->fd = fd; - s1->cc = -1; - 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 != '(') - return tcc_error_noabort("( expected"); - for(;;) { - t = ld_next(s1, filename, sizeof(filename)); - if (t == LD_TOK_EOF) { - return tcc_error_noabort("unexpected end of file"); - } else if (t == ')') { - break; - } - } - } else { - return -1; - } - } - return 0; -} -#endif /* !ELF_OBJ_ONLY */ |