[279] | 1 | /*
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| 2 | * ELF file handling for TCC
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| 3 | *
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| 4 | * Copyright (c) 2001-2004 Fabrice Bellard
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| 5 | *
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| 6 | * This library is free software; you can redistribute it and/or
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| 7 | * modify it under the terms of the GNU Lesser General Public
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| 8 | * License as published by the Free Software Foundation; either
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| 9 | * version 2 of the License, or (at your option) any later version.
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| 10 | *
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| 11 | * This library is distributed in the hope that it will be useful,
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 14 | * Lesser General Public License for more details.
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| 15 | *
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| 16 | * You should have received a copy of the GNU Lesser General Public
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| 17 | * License along with this library; if not, write to the Free Software
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| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 19 | */
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| 20 |
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| 21 | #include "tcc.h"
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| 22 |
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| 23 | static int new_undef_sym = 0; /* Is there a new undefined sym since last new_undef_sym() */
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| 24 |
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| 25 | ST_FUNC int put_elf_str(Section *s, const char *sym)
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| 26 | {
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| 27 | int offset, len;
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| 28 | char *ptr;
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| 29 |
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| 30 | len = strlen(sym) + 1;
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| 31 | offset = s->data_offset;
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| 32 | ptr = section_ptr_add(s, len);
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| 33 | memcpy(ptr, sym, len);
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| 34 | return offset;
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| 35 | }
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| 36 |
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| 37 | /* elf symbol hashing function */
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| 38 | static unsigned long elf_hash(const unsigned char *name)
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| 39 | {
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| 40 | unsigned long h = 0, g;
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| 41 |
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| 42 | while (*name) {
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| 43 | h = (h << 4) + *name++;
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| 44 | g = h & 0xf0000000;
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| 45 | if (g)
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| 46 | h ^= g >> 24;
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| 47 | h &= ~g;
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| 48 | }
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| 49 | return h;
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| 50 | }
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| 51 |
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| 52 | /* rebuild hash table of section s */
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| 53 | /* NOTE: we do factorize the hash table code to go faster */
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| 54 | static void rebuild_hash(Section *s, unsigned int nb_buckets)
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| 55 | {
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| 56 | ElfW(Sym) *sym;
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| 57 | int *ptr, *hash, nb_syms, sym_index, h;
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| 58 | char *strtab;
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| 59 |
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| 60 | strtab = s->link->data;
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| 61 | nb_syms = s->data_offset / sizeof(ElfW(Sym));
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| 62 |
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| 63 | s->hash->data_offset = 0;
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| 64 | ptr = section_ptr_add(s->hash, (2 + nb_buckets + nb_syms) * sizeof(int));
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| 65 | ptr[0] = nb_buckets;
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| 66 | ptr[1] = nb_syms;
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| 67 | ptr += 2;
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| 68 | hash = ptr;
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| 69 | memset(hash, 0, (nb_buckets + 1) * sizeof(int));
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| 70 | ptr += nb_buckets + 1;
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| 71 |
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| 72 | sym = (ElfW(Sym) *)s->data + 1;
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| 73 | for(sym_index = 1; sym_index < nb_syms; sym_index++) {
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| 74 | if (ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) {
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| 75 | h = elf_hash(strtab + sym->st_name) % nb_buckets;
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| 76 | *ptr = hash[h];
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| 77 | hash[h] = sym_index;
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| 78 | } else {
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| 79 | *ptr = 0;
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| 80 | }
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| 81 | ptr++;
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| 82 | sym++;
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| 83 | }
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| 84 | }
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| 85 |
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| 86 | /* return the symbol number */
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| 87 | ST_FUNC int put_elf_sym(Section *s, addr_t value, unsigned long size,
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| 88 | int info, int other, int shndx, const char *name)
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| 89 | {
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| 90 | int name_offset, sym_index;
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| 91 | int nbuckets, h;
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| 92 | ElfW(Sym) *sym;
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| 93 | Section *hs;
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| 94 |
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| 95 | sym = section_ptr_add(s, sizeof(ElfW(Sym)));
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| 96 | if (name)
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| 97 | name_offset = put_elf_str(s->link, name);
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| 98 | else
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| 99 | name_offset = 0;
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| 100 | /* XXX: endianness */
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| 101 | sym->st_name = name_offset;
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| 102 | sym->st_value = value;
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| 103 | sym->st_size = size;
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| 104 | sym->st_info = info;
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| 105 | sym->st_other = other;
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| 106 | sym->st_shndx = shndx;
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| 107 | sym_index = sym - (ElfW(Sym) *)s->data;
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| 108 | hs = s->hash;
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| 109 | if (hs) {
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| 110 | int *ptr, *base;
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| 111 | ptr = section_ptr_add(hs, sizeof(int));
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| 112 | base = (int *)hs->data;
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| 113 | /* only add global or weak symbols */
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| 114 | if (ELFW(ST_BIND)(info) != STB_LOCAL) {
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| 115 | /* add another hashing entry */
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| 116 | nbuckets = base[0];
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| 117 | h = elf_hash(name) % nbuckets;
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| 118 | *ptr = base[2 + h];
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| 119 | base[2 + h] = sym_index;
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| 120 | base[1]++;
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| 121 | /* we resize the hash table */
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| 122 | hs->nb_hashed_syms++;
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| 123 | if (hs->nb_hashed_syms > 2 * nbuckets) {
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| 124 | rebuild_hash(s, 2 * nbuckets);
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| 125 | }
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| 126 | } else {
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| 127 | *ptr = 0;
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| 128 | base[1]++;
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| 129 | }
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| 130 | }
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| 131 | return sym_index;
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| 132 | }
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| 133 |
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| 134 | /* find global ELF symbol 'name' and return its index. Return 0 if not
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| 135 | found. */
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| 136 | ST_FUNC int find_elf_sym(Section *s, const char *name)
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| 137 | {
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| 138 | ElfW(Sym) *sym;
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| 139 | Section *hs;
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| 140 | int nbuckets, sym_index, h;
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| 141 | const char *name1;
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| 142 |
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| 143 | hs = s->hash;
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| 144 | if (!hs)
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| 145 | return 0;
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| 146 | nbuckets = ((int *)hs->data)[0];
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| 147 | h = elf_hash(name) % nbuckets;
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| 148 | sym_index = ((int *)hs->data)[2 + h];
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| 149 | while (sym_index != 0) {
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| 150 | sym = &((ElfW(Sym) *)s->data)[sym_index];
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| 151 | name1 = s->link->data + sym->st_name;
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| 152 | if (!strcmp(name, name1))
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| 153 | return sym_index;
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| 154 | sym_index = ((int *)hs->data)[2 + nbuckets + sym_index];
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| 155 | }
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| 156 | return 0;
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| 157 | }
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| 158 |
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| 159 | /* return elf symbol value, signal error if 'err' is nonzero */
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| 160 | ST_FUNC addr_t get_elf_sym_addr(TCCState *s, const char *name, int err)
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| 161 | {
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| 162 | int sym_index;
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| 163 | ElfW(Sym) *sym;
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| 164 |
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| 165 | sym_index = find_elf_sym(s->symtab, name);
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| 166 | sym = &((ElfW(Sym) *)s->symtab->data)[sym_index];
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| 167 | if (!sym_index || sym->st_shndx == SHN_UNDEF) {
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| 168 | if (err)
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| 169 | tcc_error("%s not defined", name);
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| 170 | return 0;
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| 171 | }
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| 172 | return sym->st_value;
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| 173 | }
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| 174 |
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| 175 | /* return elf symbol value */
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| 176 | LIBTCCAPI void *tcc_get_symbol(TCCState *s, const char *name)
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| 177 | {
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| 178 | return (void*)(uintptr_t)get_elf_sym_addr(s, name, 0);
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| 179 | }
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| 180 |
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| 181 | #ifdef TCC_IS_NATIVE
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| 182 | /* return elf symbol value or error */
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| 183 | ST_FUNC void* tcc_get_symbol_err(TCCState *s, const char *name)
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| 184 | {
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| 185 | return (void*)get_elf_sym_addr(s, name, 1);
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| 186 | }
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| 187 | #endif
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| 188 |
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| 189 | /* add an elf symbol : check if it is already defined and patch
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| 190 | it. Return symbol index. NOTE that sh_num can be SHN_UNDEF. */
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| 191 | ST_FUNC int add_elf_sym(Section *s, addr_t value, unsigned long size,
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| 192 | int info, int other, int sh_num, const char *name)
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| 193 | {
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| 194 | ElfW(Sym) *esym;
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| 195 | int sym_bind, sym_index, sym_type, esym_bind;
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| 196 | unsigned char sym_vis, esym_vis, new_vis;
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| 197 |
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| 198 | sym_bind = ELFW(ST_BIND)(info);
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| 199 | sym_type = ELFW(ST_TYPE)(info);
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| 200 | sym_vis = ELFW(ST_VISIBILITY)(other);
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| 201 |
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| 202 | if (sym_bind != STB_LOCAL) {
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| 203 | /* we search global or weak symbols */
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| 204 | sym_index = find_elf_sym(s, name);
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| 205 | if (!sym_index)
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| 206 | goto do_def;
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| 207 | esym = &((ElfW(Sym) *)s->data)[sym_index];
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| 208 | if (esym->st_shndx != SHN_UNDEF) {
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| 209 | esym_bind = ELFW(ST_BIND)(esym->st_info);
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| 210 | /* propagate the most constraining visibility */
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| 211 | /* STV_DEFAULT(0)<STV_PROTECTED(3)<STV_HIDDEN(2)<STV_INTERNAL(1) */
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| 212 | esym_vis = ELFW(ST_VISIBILITY)(esym->st_other);
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| 213 | if (esym_vis == STV_DEFAULT) {
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| 214 | new_vis = sym_vis;
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| 215 | } else if (sym_vis == STV_DEFAULT) {
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| 216 | new_vis = esym_vis;
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| 217 | } else {
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| 218 | new_vis = (esym_vis < sym_vis) ? esym_vis : sym_vis;
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| 219 | }
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| 220 | esym->st_other = (esym->st_other & ~ELFW(ST_VISIBILITY)(-1))
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| 221 | | new_vis;
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| 222 | other = esym->st_other; /* in case we have to patch esym */
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| 223 | if (sh_num == SHN_UNDEF) {
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| 224 | /* ignore adding of undefined symbol if the
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| 225 | corresponding symbol is already defined */
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| 226 | } else if (sym_bind == STB_GLOBAL && esym_bind == STB_WEAK) {
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| 227 | /* global overrides weak, so patch */
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| 228 | goto do_patch;
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| 229 | } else if (sym_bind == STB_WEAK && esym_bind == STB_GLOBAL) {
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| 230 | /* weak is ignored if already global */
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| 231 | } else if (sym_bind == STB_WEAK && esym_bind == STB_WEAK) {
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| 232 | /* keep first-found weak definition, ignore subsequents */
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| 233 | } else if (sym_vis == STV_HIDDEN || sym_vis == STV_INTERNAL) {
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| 234 | /* ignore hidden symbols after */
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| 235 | } else if (esym->st_shndx == SHN_COMMON
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| 236 | && (sh_num < SHN_LORESERVE || sh_num == SHN_COMMON)) {
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| 237 | /* gr: Happens with 'tcc ... -static tcctest.c' on e.g. Ubuntu 6.01
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| 238 | No idea if this is the correct solution ... */
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| 239 | goto do_patch;
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| 240 | } else if (s == tcc_state->dynsymtab_section) {
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| 241 | /* we accept that two DLL define the same symbol */
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| 242 | } else {
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| 243 | #if 0
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| 244 | printf("new_bind=%x new_shndx=%x new_vis=%x old_bind=%x old_shndx=%x old_vis=%x\n",
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| 245 | sym_bind, sh_num, new_vis, esym_bind, esym->st_shndx, esym_vis);
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| 246 | #endif
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| 247 | tcc_error_noabort("'%s' defined twice", name);
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| 248 | }
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| 249 | } else {
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| 250 | do_patch:
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| 251 | esym->st_info = ELFW(ST_INFO)(sym_bind, sym_type);
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| 252 | esym->st_shndx = sh_num;
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| 253 | new_undef_sym = 1;
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| 254 | esym->st_value = value;
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| 255 | esym->st_size = size;
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| 256 | esym->st_other = other;
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| 257 | }
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| 258 | } else {
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| 259 | do_def:
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| 260 | sym_index = put_elf_sym(s, value, size,
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| 261 | ELFW(ST_INFO)(sym_bind, sym_type), other,
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| 262 | sh_num, name);
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| 263 | }
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| 264 | return sym_index;
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| 265 | }
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| 266 |
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| 267 | /* put relocation */
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| 268 | ST_FUNC void put_elf_reloc(Section *symtab, Section *s, unsigned long offset,
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| 269 | int type, int symbol)
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| 270 | {
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| 271 | char buf[256];
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| 272 | Section *sr;
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| 273 | ElfW_Rel *rel;
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| 274 |
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| 275 | sr = s->reloc;
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| 276 | if (!sr) {
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| 277 | /* if no relocation section, create it */
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| 278 | snprintf(buf, sizeof(buf), REL_SECTION_FMT, s->name);
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| 279 | /* if the symtab is allocated, then we consider the relocation
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| 280 | are also */
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| 281 | sr = new_section(tcc_state, buf, SHT_RELX, symtab->sh_flags);
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| 282 | sr->sh_entsize = sizeof(ElfW_Rel);
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| 283 | sr->link = symtab;
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| 284 | sr->sh_info = s->sh_num;
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| 285 | s->reloc = sr;
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| 286 | }
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| 287 | rel = section_ptr_add(sr, sizeof(ElfW_Rel));
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| 288 | rel->r_offset = offset;
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| 289 | rel->r_info = ELFW(R_INFO)(symbol, type);
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| 290 | #ifdef TCC_TARGET_X86_64
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| 291 | rel->r_addend = 0;
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| 292 | #endif
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| 293 | }
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| 294 |
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| 295 | /* put stab debug information */
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| 296 |
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| 297 | ST_FUNC void put_stabs(const char *str, int type, int other, int desc,
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| 298 | unsigned long value)
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| 299 | {
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| 300 | Stab_Sym *sym;
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| 301 |
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| 302 | sym = section_ptr_add(stab_section, sizeof(Stab_Sym));
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| 303 | if (str) {
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| 304 | sym->n_strx = put_elf_str(stabstr_section, str);
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| 305 | } else {
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| 306 | sym->n_strx = 0;
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| 307 | }
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| 308 | sym->n_type = type;
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| 309 | sym->n_other = other;
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| 310 | sym->n_desc = desc;
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| 311 | sym->n_value = value;
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| 312 | }
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| 313 |
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| 314 | ST_FUNC void put_stabs_r(const char *str, int type, int other, int desc,
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| 315 | unsigned long value, Section *sec, int sym_index)
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| 316 | {
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| 317 | put_stabs(str, type, other, desc, value);
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| 318 | put_elf_reloc(symtab_section, stab_section,
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| 319 | stab_section->data_offset - sizeof(unsigned int),
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| 320 | R_DATA_32, sym_index);
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| 321 | }
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| 322 |
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| 323 | ST_FUNC void put_stabn(int type, int other, int desc, int value)
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| 324 | {
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| 325 | put_stabs(NULL, type, other, desc, value);
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| 326 | }
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| 327 |
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| 328 | ST_FUNC void put_stabd(int type, int other, int desc)
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| 329 | {
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| 330 | put_stabs(NULL, type, other, desc, 0);
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| 331 | }
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| 332 |
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| 333 | /* In an ELF file symbol table, the local symbols must appear below
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| 334 | the global and weak ones. Since TCC cannot sort it while generating
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| 335 | the code, we must do it after. All the relocation tables are also
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| 336 | modified to take into account the symbol table sorting */
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| 337 | static void sort_syms(TCCState *s1, Section *s)
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| 338 | {
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| 339 | int *old_to_new_syms;
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| 340 | ElfW(Sym) *new_syms;
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| 341 | int nb_syms, i;
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| 342 | ElfW(Sym) *p, *q;
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| 343 | ElfW_Rel *rel, *rel_end;
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| 344 | Section *sr;
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| 345 | int type, sym_index;
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| 346 |
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| 347 | nb_syms = s->data_offset / sizeof(ElfW(Sym));
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| 348 | new_syms = tcc_malloc(nb_syms * sizeof(ElfW(Sym)));
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| 349 | old_to_new_syms = tcc_malloc(nb_syms * sizeof(int));
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| 350 |
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| 351 | /* first pass for local symbols */
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| 352 | p = (ElfW(Sym) *)s->data;
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| 353 | q = new_syms;
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| 354 | for(i = 0; i < nb_syms; i++) {
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| 355 | if (ELFW(ST_BIND)(p->st_info) == STB_LOCAL) {
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| 356 | old_to_new_syms[i] = q - new_syms;
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| 357 | *q++ = *p;
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| 358 | }
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| 359 | p++;
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| 360 | }
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| 361 | /* save the number of local symbols in section header */
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| 362 | s->sh_info = q - new_syms;
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| 363 |
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| 364 | /* then second pass for non local symbols */
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| 365 | p = (ElfW(Sym) *)s->data;
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| 366 | for(i = 0; i < nb_syms; i++) {
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| 367 | if (ELFW(ST_BIND)(p->st_info) != STB_LOCAL) {
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| 368 | old_to_new_syms[i] = q - new_syms;
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| 369 | *q++ = *p;
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| 370 | }
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| 371 | p++;
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| 372 | }
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| 373 |
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| 374 | /* we copy the new symbols to the old */
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| 375 | memcpy(s->data, new_syms, nb_syms * sizeof(ElfW(Sym)));
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| 376 | tcc_free(new_syms);
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| 377 |
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| 378 | /* now we modify all the relocations */
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| 379 | for(i = 1; i < s1->nb_sections; i++) {
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| 380 | sr = s1->sections[i];
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| 381 | if (sr->sh_type == SHT_RELX && sr->link == s) {
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| 382 | rel_end = (ElfW_Rel *)(sr->data + sr->data_offset);
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| 383 | for(rel = (ElfW_Rel *)sr->data;
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| 384 | rel < rel_end;
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| 385 | rel++) {
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| 386 | sym_index = ELFW(R_SYM)(rel->r_info);
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| 387 | type = ELFW(R_TYPE)(rel->r_info);
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| 388 | sym_index = old_to_new_syms[sym_index];
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| 389 | rel->r_info = ELFW(R_INFO)(sym_index, type);
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| 390 | }
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| 391 | }
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| 392 | }
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| 393 |
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| 394 | tcc_free(old_to_new_syms);
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| 395 | }
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| 396 |
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| 397 | /* relocate common symbols in the .bss section */
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| 398 | ST_FUNC void relocate_common_syms(void)
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| 399 | {
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| 400 | ElfW(Sym) *sym, *sym_end;
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| 401 | unsigned long offset, align;
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| 402 |
|
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| 403 | sym_end = (ElfW(Sym) *)(symtab_section->data + symtab_section->data_offset);
|
---|
| 404 | for(sym = (ElfW(Sym) *)symtab_section->data + 1;
|
---|
| 405 | sym < sym_end;
|
---|
| 406 | sym++) {
|
---|
| 407 | if (sym->st_shndx == SHN_COMMON) {
|
---|
| 408 | /* align symbol */
|
---|
| 409 | align = sym->st_value;
|
---|
| 410 | offset = bss_section->data_offset;
|
---|
| 411 | offset = (offset + align - 1) & -align;
|
---|
| 412 | sym->st_value = offset;
|
---|
| 413 | sym->st_shndx = bss_section->sh_num;
|
---|
| 414 | offset += sym->st_size;
|
---|
| 415 | bss_section->data_offset = offset;
|
---|
| 416 | }
|
---|
| 417 | }
|
---|
| 418 | }
|
---|
| 419 |
|
---|
| 420 | /* relocate symbol table, resolve undefined symbols if do_resolve is
|
---|
| 421 | true and output error if undefined symbol. */
|
---|
| 422 | ST_FUNC void relocate_syms(TCCState *s1, int do_resolve)
|
---|
| 423 | {
|
---|
| 424 | ElfW(Sym) *sym, *esym, *sym_end;
|
---|
| 425 | int sym_bind, sh_num, sym_index;
|
---|
| 426 | const char *name;
|
---|
| 427 |
|
---|
| 428 | sym_end = (ElfW(Sym) *)(symtab_section->data + symtab_section->data_offset);
|
---|
| 429 | for(sym = (ElfW(Sym) *)symtab_section->data + 1;
|
---|
| 430 | sym < sym_end;
|
---|
| 431 | sym++) {
|
---|
| 432 | sh_num = sym->st_shndx;
|
---|
| 433 | if (sh_num == SHN_UNDEF) {
|
---|
| 434 | name = strtab_section->data + sym->st_name;
|
---|
| 435 | if (do_resolve) {
|
---|
| 436 | #if defined TCC_IS_NATIVE && !defined _WIN32
|
---|
| 437 | void *addr;
|
---|
| 438 | name = symtab_section->link->data + sym->st_name;
|
---|
| 439 | addr = resolve_sym(s1, name);
|
---|
| 440 | if (addr) {
|
---|
| 441 | sym->st_value = (addr_t)addr;
|
---|
| 442 | goto found;
|
---|
| 443 | }
|
---|
| 444 | #endif
|
---|
| 445 | } else if (s1->dynsym) {
|
---|
| 446 | /* if dynamic symbol exist, then use it */
|
---|
| 447 | sym_index = find_elf_sym(s1->dynsym, name);
|
---|
| 448 | if (sym_index) {
|
---|
| 449 | esym = &((ElfW(Sym) *)s1->dynsym->data)[sym_index];
|
---|
| 450 | sym->st_value = esym->st_value;
|
---|
| 451 | goto found;
|
---|
| 452 | }
|
---|
| 453 | }
|
---|
| 454 | /* XXX: _fp_hw seems to be part of the ABI, so we ignore
|
---|
| 455 | it */
|
---|
| 456 | if (!strcmp(name, "_fp_hw"))
|
---|
| 457 | goto found;
|
---|
| 458 | /* only weak symbols are accepted to be undefined. Their
|
---|
| 459 | value is zero */
|
---|
| 460 | sym_bind = ELFW(ST_BIND)(sym->st_info);
|
---|
| 461 | if (sym_bind == STB_WEAK) {
|
---|
| 462 | sym->st_value = 0;
|
---|
| 463 | } else {
|
---|
| 464 | tcc_error_noabort("undefined symbol '%s'", name);
|
---|
| 465 | }
|
---|
| 466 | } else if (sh_num < SHN_LORESERVE) {
|
---|
| 467 | /* add section base */
|
---|
| 468 | sym->st_value += s1->sections[sym->st_shndx]->sh_addr;
|
---|
| 469 | }
|
---|
| 470 | found: ;
|
---|
| 471 | }
|
---|
| 472 | }
|
---|
| 473 |
|
---|
| 474 | #ifdef TCC_HAS_RUNTIME_PLTGOT
|
---|
| 475 | #ifdef TCC_TARGET_X86_64
|
---|
| 476 | #define JMP_TABLE_ENTRY_SIZE 14
|
---|
| 477 | static addr_t add_jmp_table(TCCState *s1, addr_t val)
|
---|
| 478 | {
|
---|
| 479 | char *p = s1->runtime_plt_and_got + s1->runtime_plt_and_got_offset;
|
---|
| 480 | s1->runtime_plt_and_got_offset += JMP_TABLE_ENTRY_SIZE;
|
---|
| 481 | /* jmp *0x0(%rip) */
|
---|
| 482 | p[0] = 0xff;
|
---|
| 483 | p[1] = 0x25;
|
---|
| 484 | *(int *)(p + 2) = 0;
|
---|
| 485 | *(addr_t *)(p + 6) = val;
|
---|
| 486 | return (addr_t)p;
|
---|
| 487 | }
|
---|
| 488 |
|
---|
| 489 | static addr_t add_got_table(TCCState *s1, addr_t val)
|
---|
| 490 | {
|
---|
| 491 | addr_t *p = (addr_t *)(s1->runtime_plt_and_got + s1->runtime_plt_and_got_offset);
|
---|
| 492 | s1->runtime_plt_and_got_offset += sizeof(addr_t);
|
---|
| 493 | *p = val;
|
---|
| 494 | return (addr_t)p;
|
---|
| 495 | }
|
---|
| 496 | #elif defined TCC_TARGET_ARM
|
---|
| 497 | #define JMP_TABLE_ENTRY_SIZE 8
|
---|
| 498 | static addr_t add_jmp_table(TCCState *s1, int val)
|
---|
| 499 | {
|
---|
| 500 | uint32_t *p = (uint32_t *)(s1->runtime_plt_and_got + s1->runtime_plt_and_got_offset);
|
---|
| 501 | s1->runtime_plt_and_got_offset += JMP_TABLE_ENTRY_SIZE;
|
---|
| 502 | /* ldr pc, [pc, #-4] */
|
---|
| 503 | p[0] = 0xE51FF004;
|
---|
| 504 | p[1] = val;
|
---|
| 505 | return (addr_t)p;
|
---|
| 506 | }
|
---|
| 507 | #endif
|
---|
| 508 | #endif /* def TCC_HAS_RUNTIME_PLTGOT */
|
---|
| 509 |
|
---|
| 510 | /* relocate a given section (CPU dependent) */
|
---|
| 511 | ST_FUNC void relocate_section(TCCState *s1, Section *s)
|
---|
| 512 | {
|
---|
| 513 | Section *sr;
|
---|
| 514 | ElfW_Rel *rel, *rel_end, *qrel;
|
---|
| 515 | ElfW(Sym) *sym;
|
---|
| 516 | int type, sym_index;
|
---|
| 517 | unsigned char *ptr;
|
---|
| 518 | addr_t val, addr;
|
---|
| 519 | #if defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64
|
---|
| 520 | int esym_index;
|
---|
| 521 | #endif
|
---|
| 522 |
|
---|
| 523 | sr = s->reloc;
|
---|
| 524 | rel_end = (ElfW_Rel *)(sr->data + sr->data_offset);
|
---|
| 525 | qrel = (ElfW_Rel *)sr->data;
|
---|
| 526 | for(rel = qrel;
|
---|
| 527 | rel < rel_end;
|
---|
| 528 | rel++) {
|
---|
| 529 | ptr = s->data + rel->r_offset;
|
---|
| 530 |
|
---|
| 531 | sym_index = ELFW(R_SYM)(rel->r_info);
|
---|
| 532 | sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
|
---|
| 533 | val = sym->st_value;
|
---|
| 534 | #ifdef TCC_TARGET_X86_64
|
---|
| 535 | val += rel->r_addend;
|
---|
| 536 | #endif
|
---|
| 537 | type = ELFW(R_TYPE)(rel->r_info);
|
---|
| 538 | addr = s->sh_addr + rel->r_offset;
|
---|
| 539 |
|
---|
| 540 | /* CPU specific */
|
---|
| 541 | switch(type) {
|
---|
| 542 | #if defined(TCC_TARGET_I386)
|
---|
| 543 | case R_386_32:
|
---|
| 544 | if (s1->output_type == TCC_OUTPUT_DLL) {
|
---|
| 545 | esym_index = s1->symtab_to_dynsym[sym_index];
|
---|
| 546 | qrel->r_offset = rel->r_offset;
|
---|
| 547 | if (esym_index) {
|
---|
| 548 | qrel->r_info = ELFW(R_INFO)(esym_index, R_386_32);
|
---|
| 549 | qrel++;
|
---|
| 550 | break;
|
---|
| 551 | } else {
|
---|
| 552 | qrel->r_info = ELFW(R_INFO)(0, R_386_RELATIVE);
|
---|
| 553 | qrel++;
|
---|
| 554 | }
|
---|
| 555 | }
|
---|
| 556 | *(int *)ptr += val;
|
---|
| 557 | break;
|
---|
| 558 | case R_386_PC32:
|
---|
| 559 | if (s1->output_type == TCC_OUTPUT_DLL) {
|
---|
| 560 | /* DLL relocation */
|
---|
| 561 | esym_index = s1->symtab_to_dynsym[sym_index];
|
---|
| 562 | if (esym_index) {
|
---|
| 563 | qrel->r_offset = rel->r_offset;
|
---|
| 564 | qrel->r_info = ELFW(R_INFO)(esym_index, R_386_PC32);
|
---|
| 565 | qrel++;
|
---|
| 566 | break;
|
---|
| 567 | }
|
---|
| 568 | }
|
---|
| 569 | *(int *)ptr += val - addr;
|
---|
| 570 | break;
|
---|
| 571 | case R_386_PLT32:
|
---|
| 572 | *(int *)ptr += val - addr;
|
---|
| 573 | break;
|
---|
| 574 | case R_386_GLOB_DAT:
|
---|
| 575 | case R_386_JMP_SLOT:
|
---|
| 576 | *(int *)ptr = val;
|
---|
| 577 | break;
|
---|
| 578 | case R_386_GOTPC:
|
---|
| 579 | *(int *)ptr += s1->got->sh_addr - addr;
|
---|
| 580 | break;
|
---|
| 581 | case R_386_GOTOFF:
|
---|
| 582 | *(int *)ptr += val - s1->got->sh_addr;
|
---|
| 583 | break;
|
---|
| 584 | case R_386_GOT32:
|
---|
| 585 | /* we load the got offset */
|
---|
| 586 | *(int *)ptr += s1->sym_attrs[sym_index].got_offset;
|
---|
| 587 | break;
|
---|
| 588 | case R_386_16:
|
---|
| 589 | if (s1->output_format != TCC_OUTPUT_FORMAT_BINARY) {
|
---|
| 590 | output_file:
|
---|
| 591 | tcc_error("can only produce 16-bit binary files");
|
---|
| 592 | }
|
---|
| 593 | *(short *)ptr += val;
|
---|
| 594 | break;
|
---|
| 595 | case R_386_PC16:
|
---|
| 596 | if (s1->output_format != TCC_OUTPUT_FORMAT_BINARY)
|
---|
| 597 | goto output_file;
|
---|
| 598 | *(short *)ptr += val - addr;
|
---|
| 599 | break;
|
---|
| 600 | #elif defined(TCC_TARGET_ARM)
|
---|
| 601 | case R_ARM_PC24:
|
---|
| 602 | case R_ARM_CALL:
|
---|
| 603 | case R_ARM_JUMP24:
|
---|
| 604 | case R_ARM_PLT32:
|
---|
| 605 | {
|
---|
| 606 | int x, is_thumb, is_call, h, blx_avail;
|
---|
| 607 | x = (*(int *)ptr)&0xffffff;
|
---|
| 608 | (*(int *)ptr) &= 0xff000000;
|
---|
| 609 | if (x & 0x800000)
|
---|
| 610 | x -= 0x1000000;
|
---|
| 611 | x <<= 2;
|
---|
| 612 | blx_avail = (TCC_ARM_VERSION >= 5);
|
---|
| 613 | is_thumb = val & 1;
|
---|
| 614 | is_call = (type == R_ARM_CALL);
|
---|
| 615 | x += val - addr;
|
---|
| 616 | h = x & 2;
|
---|
| 617 | #ifdef TCC_HAS_RUNTIME_PLTGOT
|
---|
| 618 | if (s1->output_type == TCC_OUTPUT_MEMORY) {
|
---|
| 619 | if ((x & 3) || x >= 0x2000000 || x < -0x2000000)
|
---|
| 620 | if (!(x & 3) || !blx_avail || !is_call) {
|
---|
| 621 | x += add_jmp_table(s1, val) - val; /* add veneer */
|
---|
| 622 | is_thumb = 0; /* Veneer uses ARM instructions */
|
---|
| 623 | }
|
---|
| 624 | }
|
---|
| 625 | #endif
|
---|
| 626 | if ((x & 3) || x >= 0x2000000 || x < -0x2000000)
|
---|
| 627 | if (!(x & 3) || !blx_avail || !is_call)
|
---|
| 628 | tcc_error("can't relocate value at %x",addr);
|
---|
| 629 | x >>= 2;
|
---|
| 630 | x &= 0xffffff;
|
---|
| 631 | /* Only reached if blx is avail and it is a call */
|
---|
| 632 | if (is_thumb) {
|
---|
| 633 | x |= h << 24;
|
---|
| 634 | (*(int *)ptr) = 0xfa << 24; /* bl -> blx */
|
---|
| 635 | }
|
---|
| 636 | (*(int *)ptr) |= x;
|
---|
| 637 | }
|
---|
| 638 | break;
|
---|
| 639 | /* Since these relocations only concern Thumb-2 and blx instruction was
|
---|
| 640 | introduced before Thumb-2, we can assume blx is available and not
|
---|
| 641 | guard its use */
|
---|
| 642 | case R_ARM_THM_CALL:
|
---|
| 643 | case R_ARM_THM_JUMP24:
|
---|
| 644 | {
|
---|
| 645 | int x, hi, lo, s, j1, j2, i1, i2, imm10, imm11;
|
---|
| 646 | int to_thumb, is_call, to_plt, blx_bit = 1 << 12;
|
---|
| 647 | Section *plt;
|
---|
| 648 |
|
---|
| 649 | /* weak reference */
|
---|
| 650 | if (sym->st_shndx == SHN_UNDEF &&
|
---|
| 651 | ELFW(ST_BIND)(sym->st_info) == STB_WEAK)
|
---|
| 652 | break;
|
---|
| 653 |
|
---|
| 654 | /* Get initial offset */
|
---|
| 655 | hi = (*(uint16_t *)ptr);
|
---|
| 656 | lo = (*(uint16_t *)(ptr+2));
|
---|
| 657 | s = (hi >> 10) & 1;
|
---|
| 658 | j1 = (lo >> 13) & 1;
|
---|
| 659 | j2 = (lo >> 11) & 1;
|
---|
| 660 | i1 = (j1 ^ s) ^ 1;
|
---|
| 661 | i2 = (j2 ^ s) ^ 1;
|
---|
| 662 | imm10 = hi & 0x3ff;
|
---|
| 663 | imm11 = lo & 0x7ff;
|
---|
| 664 | x = (s << 24) | (i1 << 23) | (i2 << 22) |
|
---|
| 665 | (imm10 << 12) | (imm11 << 1);
|
---|
| 666 | if (x & 0x01000000)
|
---|
| 667 | x -= 0x02000000;
|
---|
| 668 |
|
---|
| 669 | /* Relocation infos */
|
---|
| 670 | to_thumb = val & 1;
|
---|
| 671 | plt = s1->plt;
|
---|
| 672 | to_plt = (val >= plt->sh_addr) &&
|
---|
| 673 | (val < plt->sh_addr + plt->data_offset);
|
---|
| 674 | is_call = (type == R_ARM_THM_CALL);
|
---|
| 675 |
|
---|
| 676 | /* Compute final offset */
|
---|
| 677 | if (to_plt && !is_call) /* Point to 1st instr of Thumb stub */
|
---|
| 678 | x -= 4;
|
---|
| 679 | x += val - addr;
|
---|
| 680 | if (!to_thumb && is_call) {
|
---|
| 681 | blx_bit = 0; /* bl -> blx */
|
---|
| 682 | x = (x + 3) & -4; /* Compute offset from aligned PC */
|
---|
| 683 | }
|
---|
| 684 |
|
---|
| 685 | /* Check that relocation is possible
|
---|
| 686 | * offset must not be out of range
|
---|
| 687 | * if target is to be entered in arm mode:
|
---|
| 688 | - bit 1 must not set
|
---|
| 689 | - instruction must be a call (bl) or a jump to PLT */
|
---|
| 690 | if (!to_thumb || x >= 0x1000000 || x < -0x1000000)
|
---|
| 691 | if (to_thumb || (val & 2) || (!is_call && !to_plt))
|
---|
| 692 | tcc_error("can't relocate value at %x",addr);
|
---|
| 693 |
|
---|
| 694 | /* Compute and store final offset */
|
---|
| 695 | s = (x >> 24) & 1;
|
---|
| 696 | i1 = (x >> 23) & 1;
|
---|
| 697 | i2 = (x >> 22) & 1;
|
---|
| 698 | j1 = s ^ (i1 ^ 1);
|
---|
| 699 | j2 = s ^ (i2 ^ 1);
|
---|
| 700 | imm10 = (x >> 12) & 0x3ff;
|
---|
| 701 | imm11 = (x >> 1) & 0x7ff;
|
---|
| 702 | (*(uint16_t *)ptr) = (uint16_t) ((hi & 0xf800) |
|
---|
| 703 | (s << 10) | imm10);
|
---|
| 704 | (*(uint16_t *)(ptr+2)) = (uint16_t) ((lo & 0xc000) |
|
---|
| 705 | (j1 << 13) | blx_bit | (j2 << 11) |
|
---|
| 706 | imm11);
|
---|
| 707 | }
|
---|
| 708 | break;
|
---|
| 709 | case R_ARM_MOVT_ABS:
|
---|
| 710 | case R_ARM_MOVW_ABS_NC:
|
---|
| 711 | {
|
---|
| 712 | int x, imm4, imm12;
|
---|
| 713 | if (type == R_ARM_MOVT_ABS)
|
---|
| 714 | val >>= 16;
|
---|
| 715 | imm12 = val & 0xfff;
|
---|
| 716 | imm4 = (val >> 12) & 0xf;
|
---|
| 717 | x = (imm4 << 16) | imm12;
|
---|
| 718 | if (type == R_ARM_THM_MOVT_ABS)
|
---|
| 719 | *(int *)ptr |= x;
|
---|
| 720 | else
|
---|
| 721 | *(int *)ptr += x;
|
---|
| 722 | }
|
---|
| 723 | break;
|
---|
| 724 | case R_ARM_THM_MOVT_ABS:
|
---|
| 725 | case R_ARM_THM_MOVW_ABS_NC:
|
---|
| 726 | {
|
---|
| 727 | int x, i, imm4, imm3, imm8;
|
---|
| 728 | if (type == R_ARM_THM_MOVT_ABS)
|
---|
| 729 | val >>= 16;
|
---|
| 730 | imm8 = val & 0xff;
|
---|
| 731 | imm3 = (val >> 8) & 0x7;
|
---|
| 732 | i = (val >> 11) & 1;
|
---|
| 733 | imm4 = (val >> 12) & 0xf;
|
---|
| 734 | x = (imm3 << 28) | (imm8 << 16) | (i << 10) | imm4;
|
---|
| 735 | if (type == R_ARM_THM_MOVT_ABS)
|
---|
| 736 | *(int *)ptr |= x;
|
---|
| 737 | else
|
---|
| 738 | *(int *)ptr += x;
|
---|
| 739 | }
|
---|
| 740 | break;
|
---|
| 741 | case R_ARM_PREL31:
|
---|
| 742 | {
|
---|
| 743 | int x;
|
---|
| 744 | x = (*(int *)ptr) & 0x7fffffff;
|
---|
| 745 | (*(int *)ptr) &= 0x80000000;
|
---|
| 746 | x = (x * 2) / 2;
|
---|
| 747 | x += val - addr;
|
---|
| 748 | if((x^(x>>1))&0x40000000)
|
---|
| 749 | tcc_error("can't relocate value at %x",addr);
|
---|
| 750 | (*(int *)ptr) |= x & 0x7fffffff;
|
---|
| 751 | }
|
---|
| 752 | case R_ARM_ABS32:
|
---|
| 753 | *(int *)ptr += val;
|
---|
| 754 | break;
|
---|
| 755 | case R_ARM_REL32:
|
---|
| 756 | *(int *)ptr += val - addr;
|
---|
| 757 | break;
|
---|
| 758 | case R_ARM_BASE_PREL:
|
---|
| 759 | *(int *)ptr += s1->got->sh_addr - addr;
|
---|
| 760 | break;
|
---|
| 761 | case R_ARM_GOTOFF32:
|
---|
| 762 | *(int *)ptr += val - s1->got->sh_addr;
|
---|
| 763 | break;
|
---|
| 764 | case R_ARM_GOT_BREL:
|
---|
| 765 | /* we load the got offset */
|
---|
| 766 | *(int *)ptr += s1->sym_attrs[sym_index].got_offset;
|
---|
| 767 | break;
|
---|
| 768 | case R_ARM_COPY:
|
---|
| 769 | break;
|
---|
| 770 | case R_ARM_V4BX:
|
---|
| 771 | /* trade Thumb support for ARMv4 support */
|
---|
| 772 | if ((0x0ffffff0 & *(int*)ptr) == 0x012FFF10)
|
---|
| 773 | *(int*)ptr ^= 0xE12FFF10 ^ 0xE1A0F000; /* BX Rm -> MOV PC, Rm */
|
---|
| 774 | break;
|
---|
| 775 | default:
|
---|
| 776 | fprintf(stderr,"FIXME: handle reloc type %x at %x [%p] to %x\n",
|
---|
| 777 | type, (unsigned)addr, ptr, (unsigned)val);
|
---|
| 778 | break;
|
---|
| 779 | #elif defined(TCC_TARGET_C67)
|
---|
| 780 | case R_C60_32:
|
---|
| 781 | *(int *)ptr += val;
|
---|
| 782 | break;
|
---|
| 783 | case R_C60LO16:
|
---|
| 784 | {
|
---|
| 785 | uint32_t orig;
|
---|
| 786 |
|
---|
| 787 | /* put the low 16 bits of the absolute address */
|
---|
| 788 | // add to what is already there
|
---|
| 789 |
|
---|
| 790 | orig = ((*(int *)(ptr )) >> 7) & 0xffff;
|
---|
| 791 | orig |= (((*(int *)(ptr+4)) >> 7) & 0xffff) << 16;
|
---|
| 792 |
|
---|
| 793 | //patch both at once - assumes always in pairs Low - High
|
---|
| 794 |
|
---|
| 795 | *(int *) ptr = (*(int *) ptr & (~(0xffff << 7)) ) | (((val+orig) & 0xffff) << 7);
|
---|
| 796 | *(int *)(ptr+4) = (*(int *)(ptr+4) & (~(0xffff << 7)) ) | ((((val+orig)>>16) & 0xffff) << 7);
|
---|
| 797 | }
|
---|
| 798 | break;
|
---|
| 799 | case R_C60HI16:
|
---|
| 800 | break;
|
---|
| 801 | default:
|
---|
| 802 | fprintf(stderr,"FIXME: handle reloc type %x at %x [%p] to %x\n",
|
---|
| 803 | type, (unsigned)addr, ptr, (unsigned)val);
|
---|
| 804 | break;
|
---|
| 805 | #elif defined(TCC_TARGET_X86_64)
|
---|
| 806 | case R_X86_64_64:
|
---|
| 807 | if (s1->output_type == TCC_OUTPUT_DLL) {
|
---|
| 808 | qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE);
|
---|
| 809 | qrel->r_addend = *(long long *)ptr + val;
|
---|
| 810 | qrel++;
|
---|
| 811 | }
|
---|
| 812 | *(long long *)ptr += val;
|
---|
| 813 | break;
|
---|
| 814 | case R_X86_64_32:
|
---|
| 815 | case R_X86_64_32S:
|
---|
| 816 | if (s1->output_type == TCC_OUTPUT_DLL) {
|
---|
| 817 | /* XXX: this logic may depend on TCC's codegen
|
---|
| 818 | now TCC uses R_X86_64_32 even for a 64bit pointer */
|
---|
| 819 | qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE);
|
---|
| 820 | qrel->r_addend = *(int *)ptr + val;
|
---|
| 821 | qrel++;
|
---|
| 822 | }
|
---|
| 823 | *(int *)ptr += val;
|
---|
| 824 | break;
|
---|
| 825 |
|
---|
| 826 | case R_X86_64_PC32:
|
---|
| 827 | if (s1->output_type == TCC_OUTPUT_DLL) {
|
---|
| 828 | /* DLL relocation */
|
---|
| 829 | esym_index = s1->symtab_to_dynsym[sym_index];
|
---|
| 830 | if (esym_index) {
|
---|
| 831 | qrel->r_offset = rel->r_offset;
|
---|
| 832 | qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_PC32);
|
---|
| 833 | qrel->r_addend = *(int *)ptr;
|
---|
| 834 | qrel++;
|
---|
| 835 | break;
|
---|
| 836 | }
|
---|
| 837 | }
|
---|
| 838 | /* fall through */
|
---|
| 839 | case R_X86_64_PLT32: {
|
---|
| 840 | long long diff;
|
---|
| 841 | diff = (long long)val - addr;
|
---|
| 842 | if (diff <= -2147483647 || diff > 2147483647) {
|
---|
| 843 | #ifdef TCC_HAS_RUNTIME_PLTGOT
|
---|
| 844 | /* XXX: naive support for over 32bit jump */
|
---|
| 845 | if (s1->output_type == TCC_OUTPUT_MEMORY) {
|
---|
| 846 | val = (add_jmp_table(s1, val - rel->r_addend) +
|
---|
| 847 | rel->r_addend);
|
---|
| 848 | diff = val - addr;
|
---|
| 849 | }
|
---|
| 850 | #endif
|
---|
| 851 | if (diff <= -2147483647 || diff > 2147483647) {
|
---|
| 852 | tcc_error("internal error: relocation failed");
|
---|
| 853 | }
|
---|
| 854 | }
|
---|
| 855 | *(int *)ptr += diff;
|
---|
| 856 | }
|
---|
| 857 | break;
|
---|
| 858 | case R_X86_64_GLOB_DAT:
|
---|
| 859 | case R_X86_64_JUMP_SLOT:
|
---|
| 860 | /* They don't need addend */
|
---|
| 861 | *(int *)ptr = val - rel->r_addend;
|
---|
| 862 | break;
|
---|
| 863 | case R_X86_64_GOTPCREL:
|
---|
| 864 | #ifdef TCC_HAS_RUNTIME_PLTGOT
|
---|
| 865 | if (s1->output_type == TCC_OUTPUT_MEMORY) {
|
---|
| 866 | val = add_got_table(s1, val - rel->r_addend) + rel->r_addend;
|
---|
| 867 | *(int *)ptr += val - addr;
|
---|
| 868 | break;
|
---|
| 869 | }
|
---|
| 870 | #endif
|
---|
| 871 | *(int *)ptr += (s1->got->sh_addr - addr +
|
---|
| 872 | s1->sym_attrs[sym_index].got_offset - 4);
|
---|
| 873 | break;
|
---|
| 874 | case R_X86_64_GOTTPOFF:
|
---|
| 875 | *(int *)ptr += val - s1->got->sh_addr;
|
---|
| 876 | break;
|
---|
| 877 | case R_X86_64_GOT32:
|
---|
| 878 | /* we load the got offset */
|
---|
| 879 | *(int *)ptr += s1->sym_attrs[sym_index].got_offset;
|
---|
| 880 | break;
|
---|
| 881 | #elif defined(TCC_TARGET_IL)
|
---|
| 882 | #else
|
---|
| 883 | #error unsupported processor
|
---|
| 884 | #endif
|
---|
| 885 | }
|
---|
| 886 | }
|
---|
| 887 | /* if the relocation is allocated, we change its symbol table */
|
---|
| 888 | if (sr->sh_flags & SHF_ALLOC)
|
---|
| 889 | sr->link = s1->dynsym;
|
---|
| 890 | }
|
---|
| 891 |
|
---|
| 892 | /* relocate relocation table in 'sr' */
|
---|
| 893 | static void relocate_rel(TCCState *s1, Section *sr)
|
---|
| 894 | {
|
---|
| 895 | Section *s;
|
---|
| 896 | ElfW_Rel *rel, *rel_end;
|
---|
| 897 |
|
---|
| 898 | s = s1->sections[sr->sh_info];
|
---|
| 899 | rel_end = (ElfW_Rel *)(sr->data + sr->data_offset);
|
---|
| 900 | for(rel = (ElfW_Rel *)sr->data;
|
---|
| 901 | rel < rel_end;
|
---|
| 902 | rel++) {
|
---|
| 903 | rel->r_offset += s->sh_addr;
|
---|
| 904 | }
|
---|
| 905 | }
|
---|
| 906 |
|
---|
| 907 | /* count the number of dynamic relocations so that we can reserve
|
---|
| 908 | their space */
|
---|
| 909 | static int prepare_dynamic_rel(TCCState *s1, Section *sr)
|
---|
| 910 | {
|
---|
| 911 | ElfW_Rel *rel, *rel_end;
|
---|
| 912 | int sym_index, esym_index, type, count;
|
---|
| 913 |
|
---|
| 914 | count = 0;
|
---|
| 915 | rel_end = (ElfW_Rel *)(sr->data + sr->data_offset);
|
---|
| 916 | for(rel = (ElfW_Rel *)sr->data; rel < rel_end; rel++) {
|
---|
| 917 | sym_index = ELFW(R_SYM)(rel->r_info);
|
---|
| 918 | type = ELFW(R_TYPE)(rel->r_info);
|
---|
| 919 | switch(type) {
|
---|
| 920 | #if defined(TCC_TARGET_I386)
|
---|
| 921 | case R_386_32:
|
---|
| 922 | #elif defined(TCC_TARGET_X86_64)
|
---|
| 923 | case R_X86_64_32:
|
---|
| 924 | case R_X86_64_32S:
|
---|
| 925 | case R_X86_64_64:
|
---|
| 926 | #endif
|
---|
| 927 | count++;
|
---|
| 928 | break;
|
---|
| 929 | #if defined(TCC_TARGET_I386)
|
---|
| 930 | case R_386_PC32:
|
---|
| 931 | #elif defined(TCC_TARGET_X86_64)
|
---|
| 932 | case R_X86_64_PC32:
|
---|
| 933 | #endif
|
---|
| 934 | esym_index = s1->symtab_to_dynsym[sym_index];
|
---|
| 935 | if (esym_index)
|
---|
| 936 | count++;
|
---|
| 937 | break;
|
---|
| 938 | default:
|
---|
| 939 | break;
|
---|
| 940 | }
|
---|
| 941 | }
|
---|
| 942 | if (count) {
|
---|
| 943 | /* allocate the section */
|
---|
| 944 | sr->sh_flags |= SHF_ALLOC;
|
---|
| 945 | sr->sh_size = count * sizeof(ElfW_Rel);
|
---|
| 946 | }
|
---|
| 947 | return count;
|
---|
| 948 | }
|
---|
| 949 |
|
---|
| 950 | static struct sym_attr *alloc_sym_attr(TCCState *s1, int index)
|
---|
| 951 | {
|
---|
| 952 | int n;
|
---|
| 953 | struct sym_attr *tab;
|
---|
| 954 |
|
---|
| 955 | if (index >= s1->nb_sym_attrs) {
|
---|
| 956 | /* find immediately bigger power of 2 and reallocate array */
|
---|
| 957 | n = 1;
|
---|
| 958 | while (index >= n)
|
---|
| 959 | n *= 2;
|
---|
| 960 | tab = tcc_realloc(s1->sym_attrs, n * sizeof(*s1->sym_attrs));
|
---|
| 961 | s1->sym_attrs = tab;
|
---|
| 962 | memset(s1->sym_attrs + s1->nb_sym_attrs, 0,
|
---|
| 963 | (n - s1->nb_sym_attrs) * sizeof(*s1->sym_attrs));
|
---|
| 964 | s1->nb_sym_attrs = n;
|
---|
| 965 | }
|
---|
| 966 | return &s1->sym_attrs[index];
|
---|
| 967 | }
|
---|
| 968 |
|
---|
| 969 | /* XXX: suppress that */
|
---|
| 970 | static void put32(unsigned char *p, uint32_t val)
|
---|
| 971 | {
|
---|
| 972 | p[0] = val;
|
---|
| 973 | p[1] = val >> 8;
|
---|
| 974 | p[2] = val >> 16;
|
---|
| 975 | p[3] = val >> 24;
|
---|
| 976 | }
|
---|
| 977 |
|
---|
| 978 | #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_ARM) || \
|
---|
| 979 | defined(TCC_TARGET_X86_64)
|
---|
| 980 | static uint32_t get32(unsigned char *p)
|
---|
| 981 | {
|
---|
| 982 | return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
|
---|
| 983 | }
|
---|
| 984 | #endif
|
---|
| 985 |
|
---|
| 986 | static void build_got(TCCState *s1)
|
---|
| 987 | {
|
---|
| 988 | unsigned char *ptr;
|
---|
| 989 |
|
---|
| 990 | /* if no got, then create it */
|
---|
| 991 | s1->got = new_section(s1, ".got", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE);
|
---|
| 992 | s1->got->sh_entsize = 4;
|
---|
| 993 | add_elf_sym(symtab_section, 0, 4, ELFW(ST_INFO)(STB_GLOBAL, STT_OBJECT),
|
---|
| 994 | 0, s1->got->sh_num, "_GLOBAL_OFFSET_TABLE_");
|
---|
| 995 | ptr = section_ptr_add(s1->got, 3 * PTR_SIZE);
|
---|
| 996 | #if PTR_SIZE == 4
|
---|
| 997 | /* keep space for _DYNAMIC pointer, if present */
|
---|
| 998 | put32(ptr, 0);
|
---|
| 999 | /* two dummy got entries */
|
---|
| 1000 | put32(ptr + 4, 0);
|
---|
| 1001 | put32(ptr + 8, 0);
|
---|
| 1002 | #else
|
---|
| 1003 | /* keep space for _DYNAMIC pointer, if present */
|
---|
| 1004 | put32(ptr, 0);
|
---|
| 1005 | put32(ptr + 4, 0);
|
---|
| 1006 | /* two dummy got entries */
|
---|
| 1007 | put32(ptr + 8, 0);
|
---|
| 1008 | put32(ptr + 12, 0);
|
---|
| 1009 | put32(ptr + 16, 0);
|
---|
| 1010 | put32(ptr + 20, 0);
|
---|
| 1011 | #endif
|
---|
| 1012 | }
|
---|
| 1013 |
|
---|
| 1014 | /* put a got entry corresponding to a symbol in symtab_section. 'size'
|
---|
| 1015 | and 'info' can be modifed if more precise info comes from the DLL */
|
---|
| 1016 | static void put_got_entry(TCCState *s1,
|
---|
| 1017 | int reloc_type, unsigned long size, int info,
|
---|
| 1018 | int sym_index)
|
---|
| 1019 | {
|
---|
| 1020 | int index;
|
---|
| 1021 | const char *name;
|
---|
| 1022 | ElfW(Sym) *sym;
|
---|
| 1023 | unsigned long offset;
|
---|
| 1024 | int *ptr;
|
---|
| 1025 |
|
---|
| 1026 | if (!s1->got)
|
---|
| 1027 | build_got(s1);
|
---|
| 1028 |
|
---|
| 1029 | /* if a got entry already exists for that symbol, no need to add one */
|
---|
| 1030 | if (sym_index < s1->nb_sym_attrs &&
|
---|
| 1031 | s1->sym_attrs[sym_index].got_offset)
|
---|
| 1032 | return;
|
---|
| 1033 |
|
---|
| 1034 | alloc_sym_attr(s1, sym_index)->got_offset = s1->got->data_offset;
|
---|
| 1035 |
|
---|
| 1036 | if (s1->dynsym) {
|
---|
| 1037 | sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
|
---|
| 1038 | name = symtab_section->link->data + sym->st_name;
|
---|
| 1039 | offset = sym->st_value;
|
---|
| 1040 | #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
|
---|
| 1041 | if (reloc_type ==
|
---|
| 1042 | #ifdef TCC_TARGET_X86_64
|
---|
| 1043 | R_X86_64_JUMP_SLOT
|
---|
| 1044 | #else
|
---|
| 1045 | R_386_JMP_SLOT
|
---|
| 1046 | #endif
|
---|
| 1047 | ) {
|
---|
| 1048 | Section *plt;
|
---|
| 1049 | uint8_t *p;
|
---|
| 1050 | int modrm;
|
---|
| 1051 |
|
---|
| 1052 | #if defined(TCC_OUTPUT_DLL_WITH_PLT)
|
---|
| 1053 | modrm = 0x25;
|
---|
| 1054 | #else
|
---|
| 1055 | /* if we build a DLL, we add a %ebx offset */
|
---|
| 1056 | if (s1->output_type == TCC_OUTPUT_DLL)
|
---|
| 1057 | modrm = 0xa3;
|
---|
| 1058 | else
|
---|
| 1059 | modrm = 0x25;
|
---|
| 1060 | #endif
|
---|
| 1061 |
|
---|
| 1062 | /* add a PLT entry */
|
---|
| 1063 | plt = s1->plt;
|
---|
| 1064 | if (plt->data_offset == 0) {
|
---|
| 1065 | /* first plt entry */
|
---|
| 1066 | p = section_ptr_add(plt, 16);
|
---|
| 1067 | p[0] = 0xff; /* pushl got + PTR_SIZE */
|
---|
| 1068 | p[1] = modrm + 0x10;
|
---|
| 1069 | put32(p + 2, PTR_SIZE);
|
---|
| 1070 | p[6] = 0xff; /* jmp *(got + PTR_SIZE * 2) */
|
---|
| 1071 | p[7] = modrm;
|
---|
| 1072 | put32(p + 8, PTR_SIZE * 2);
|
---|
| 1073 | }
|
---|
| 1074 |
|
---|
| 1075 | p = section_ptr_add(plt, 16);
|
---|
| 1076 | p[0] = 0xff; /* jmp *(got + x) */
|
---|
| 1077 | p[1] = modrm;
|
---|
| 1078 | put32(p + 2, s1->got->data_offset);
|
---|
| 1079 | p[6] = 0x68; /* push $xxx */
|
---|
| 1080 | put32(p + 7, (plt->data_offset - 32) >> 1);
|
---|
| 1081 | p[11] = 0xe9; /* jmp plt_start */
|
---|
| 1082 | put32(p + 12, -(plt->data_offset));
|
---|
| 1083 |
|
---|
| 1084 | /* the symbol is modified so that it will be relocated to
|
---|
| 1085 | the PLT */
|
---|
| 1086 | #if !defined(TCC_OUTPUT_DLL_WITH_PLT)
|
---|
| 1087 | if (s1->output_type == TCC_OUTPUT_EXE)
|
---|
| 1088 | #endif
|
---|
| 1089 | offset = plt->data_offset - 16;
|
---|
| 1090 | }
|
---|
| 1091 | #elif defined(TCC_TARGET_ARM)
|
---|
| 1092 | if (reloc_type == R_ARM_JUMP_SLOT) {
|
---|
| 1093 | Section *plt;
|
---|
| 1094 | uint8_t *p;
|
---|
| 1095 |
|
---|
| 1096 | /* if we build a DLL, we add a %ebx offset */
|
---|
| 1097 | if (s1->output_type == TCC_OUTPUT_DLL)
|
---|
| 1098 | tcc_error("DLLs unimplemented!");
|
---|
| 1099 |
|
---|
| 1100 | /* add a PLT entry */
|
---|
| 1101 | plt = s1->plt;
|
---|
| 1102 | if (plt->data_offset == 0) {
|
---|
| 1103 | /* first plt entry */
|
---|
| 1104 | p = section_ptr_add(plt, 16);
|
---|
| 1105 | put32(p , 0xe52de004);
|
---|
| 1106 | put32(p + 4, 0xe59fe010);
|
---|
| 1107 | put32(p + 8, 0xe08fe00e);
|
---|
| 1108 | put32(p + 12, 0xe5bef008);
|
---|
| 1109 | }
|
---|
| 1110 |
|
---|
| 1111 | if (s1->sym_attrs[sym_index].plt_thumb_stub) {
|
---|
| 1112 | p = section_ptr_add(plt, 20);
|
---|
| 1113 | put32(p , 0x4778); // bx pc
|
---|
| 1114 | put32(p+2, 0x46c0); // nop
|
---|
| 1115 | p += 4;
|
---|
| 1116 | } else
|
---|
| 1117 | p = section_ptr_add(plt, 16);
|
---|
| 1118 | put32(p , 0xe59fc004); // ldr ip, [pc, #4] // offset in GOT
|
---|
| 1119 | put32(p+4, 0xe08fc00c); // add ip, pc, ip // absolute address or offset
|
---|
| 1120 | put32(p+8, 0xe59cf000); // ldr pc, [ip] // load absolute address or load offset
|
---|
| 1121 | put32(p+12, s1->got->data_offset);
|
---|
| 1122 |
|
---|
| 1123 | /* the symbol is modified so that it will be relocated to
|
---|
| 1124 | the PLT */
|
---|
| 1125 | if (s1->output_type == TCC_OUTPUT_EXE)
|
---|
| 1126 | offset = plt->data_offset - 16;
|
---|
| 1127 | }
|
---|
| 1128 | #elif defined(TCC_TARGET_C67)
|
---|
| 1129 | tcc_error("C67 got not implemented");
|
---|
| 1130 | #elif defined(TCC_TARGET_IL)
|
---|
| 1131 | tcc_error("IL got not implemented");
|
---|
| 1132 | #else
|
---|
| 1133 | #error unsupported CPU
|
---|
| 1134 | #endif
|
---|
| 1135 | index = put_elf_sym(s1->dynsym, offset,
|
---|
| 1136 | size, info, 0, sym->st_shndx, name);
|
---|
| 1137 | /* put a got entry */
|
---|
| 1138 | put_elf_reloc(s1->dynsym, s1->got,
|
---|
| 1139 | s1->got->data_offset,
|
---|
| 1140 | reloc_type, index);
|
---|
| 1141 | }
|
---|
| 1142 | ptr = section_ptr_add(s1->got, PTR_SIZE);
|
---|
| 1143 | *ptr = 0;
|
---|
| 1144 | }
|
---|
| 1145 |
|
---|
| 1146 | /* build GOT and PLT entries */
|
---|
| 1147 | ST_FUNC void build_got_entries(TCCState *s1)
|
---|
| 1148 | {
|
---|
| 1149 | Section *s;
|
---|
| 1150 | ElfW_Rel *rel, *rel_end;
|
---|
| 1151 | ElfW(Sym) *sym;
|
---|
| 1152 | int i, type, reloc_type, sym_index;
|
---|
| 1153 |
|
---|
| 1154 | for(i = 1; i < s1->nb_sections; i++) {
|
---|
| 1155 | s = s1->sections[i];
|
---|
| 1156 | if (s->sh_type != SHT_RELX)
|
---|
| 1157 | continue;
|
---|
| 1158 | /* no need to handle got relocations */
|
---|
| 1159 | if (s->link != symtab_section)
|
---|
| 1160 | continue;
|
---|
| 1161 | rel_end = (ElfW_Rel *)(s->data + s->data_offset);
|
---|
| 1162 | for(rel = (ElfW_Rel *)s->data;
|
---|
| 1163 | rel < rel_end;
|
---|
| 1164 | rel++) {
|
---|
| 1165 | type = ELFW(R_TYPE)(rel->r_info);
|
---|
| 1166 | switch(type) {
|
---|
| 1167 | #if defined(TCC_TARGET_I386)
|
---|
| 1168 | case R_386_GOT32:
|
---|
| 1169 | case R_386_GOTOFF:
|
---|
| 1170 | case R_386_GOTPC:
|
---|
| 1171 | case R_386_PLT32:
|
---|
| 1172 | if (!s1->got)
|
---|
| 1173 | build_got(s1);
|
---|
| 1174 | if (type == R_386_GOT32 || type == R_386_PLT32) {
|
---|
| 1175 | sym_index = ELFW(R_SYM)(rel->r_info);
|
---|
| 1176 | sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
|
---|
| 1177 | /* look at the symbol got offset. If none, then add one */
|
---|
| 1178 | if (type == R_386_GOT32)
|
---|
| 1179 | reloc_type = R_386_GLOB_DAT;
|
---|
| 1180 | else
|
---|
| 1181 | reloc_type = R_386_JMP_SLOT;
|
---|
| 1182 | put_got_entry(s1, reloc_type, sym->st_size, sym->st_info,
|
---|
| 1183 | sym_index);
|
---|
| 1184 | }
|
---|
| 1185 | break;
|
---|
| 1186 | #elif defined(TCC_TARGET_ARM)
|
---|
| 1187 | case R_ARM_GOT_BREL:
|
---|
| 1188 | case R_ARM_GOTOFF32:
|
---|
| 1189 | case R_ARM_BASE_PREL:
|
---|
| 1190 | case R_ARM_PLT32:
|
---|
| 1191 | if (!s1->got)
|
---|
| 1192 | build_got(s1);
|
---|
| 1193 | if (type == R_ARM_GOT_BREL || type == R_ARM_PLT32) {
|
---|
| 1194 | sym_index = ELFW(R_SYM)(rel->r_info);
|
---|
| 1195 | sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
|
---|
| 1196 | /* look at the symbol got offset. If none, then add one */
|
---|
| 1197 | if (type == R_ARM_GOT_BREL)
|
---|
| 1198 | reloc_type = R_ARM_GLOB_DAT;
|
---|
| 1199 | else
|
---|
| 1200 | reloc_type = R_ARM_JUMP_SLOT;
|
---|
| 1201 | put_got_entry(s1, reloc_type, sym->st_size, sym->st_info,
|
---|
| 1202 | sym_index);
|
---|
| 1203 | }
|
---|
| 1204 | break;
|
---|
| 1205 | #elif defined(TCC_TARGET_C67)
|
---|
| 1206 | case R_C60_GOT32:
|
---|
| 1207 | case R_C60_GOTOFF:
|
---|
| 1208 | case R_C60_GOTPC:
|
---|
| 1209 | case R_C60_PLT32:
|
---|
| 1210 | if (!s1->got)
|
---|
| 1211 | build_got(s1);
|
---|
| 1212 | if (type == R_C60_GOT32 || type == R_C60_PLT32) {
|
---|
| 1213 | sym_index = ELFW(R_SYM)(rel->r_info);
|
---|
| 1214 | sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
|
---|
| 1215 | /* look at the symbol got offset. If none, then add one */
|
---|
| 1216 | if (type == R_C60_GOT32)
|
---|
| 1217 | reloc_type = R_C60_GLOB_DAT;
|
---|
| 1218 | else
|
---|
| 1219 | reloc_type = R_C60_JMP_SLOT;
|
---|
| 1220 | put_got_entry(s1, reloc_type, sym->st_size, sym->st_info,
|
---|
| 1221 | sym_index);
|
---|
| 1222 | }
|
---|
| 1223 | break;
|
---|
| 1224 | #elif defined(TCC_TARGET_X86_64)
|
---|
| 1225 | case R_X86_64_GOT32:
|
---|
| 1226 | case R_X86_64_GOTTPOFF:
|
---|
| 1227 | case R_X86_64_GOTPCREL:
|
---|
| 1228 | case R_X86_64_PLT32:
|
---|
| 1229 | if (!s1->got)
|
---|
| 1230 | build_got(s1);
|
---|
| 1231 | if (type == R_X86_64_GOT32 || type == R_X86_64_GOTPCREL ||
|
---|
| 1232 | type == R_X86_64_PLT32) {
|
---|
| 1233 | sym_index = ELFW(R_SYM)(rel->r_info);
|
---|
| 1234 | sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
|
---|
| 1235 | /* look at the symbol got offset. If none, then add one */
|
---|
| 1236 | if (type == R_X86_64_GOT32 || type == R_X86_64_GOTPCREL)
|
---|
| 1237 | reloc_type = R_X86_64_GLOB_DAT;
|
---|
| 1238 | else
|
---|
| 1239 | reloc_type = R_X86_64_JUMP_SLOT;
|
---|
| 1240 | put_got_entry(s1, reloc_type, sym->st_size, sym->st_info,
|
---|
| 1241 | sym_index);
|
---|
| 1242 | }
|
---|
| 1243 | break;
|
---|
| 1244 | #elif defined(TCC_TARGET_IL)
|
---|
| 1245 | #else
|
---|
| 1246 | #error unsupported CPU
|
---|
| 1247 | #endif
|
---|
| 1248 | default:
|
---|
| 1249 | break;
|
---|
| 1250 | }
|
---|
| 1251 | }
|
---|
| 1252 | }
|
---|
| 1253 | }
|
---|
| 1254 |
|
---|
| 1255 | ST_FUNC Section *new_symtab(TCCState *s1,
|
---|
| 1256 | const char *symtab_name, int sh_type, int sh_flags,
|
---|
| 1257 | const char *strtab_name,
|
---|
| 1258 | const char *hash_name, int hash_sh_flags)
|
---|
| 1259 | {
|
---|
| 1260 | Section *symtab, *strtab, *hash;
|
---|
| 1261 | int *ptr, nb_buckets;
|
---|
| 1262 |
|
---|
| 1263 | symtab = new_section(s1, symtab_name, sh_type, sh_flags);
|
---|
| 1264 | symtab->sh_entsize = sizeof(ElfW(Sym));
|
---|
| 1265 | strtab = new_section(s1, strtab_name, SHT_STRTAB, sh_flags);
|
---|
| 1266 | put_elf_str(strtab, "");
|
---|
| 1267 | symtab->link = strtab;
|
---|
| 1268 | put_elf_sym(symtab, 0, 0, 0, 0, 0, NULL);
|
---|
| 1269 |
|
---|
| 1270 | nb_buckets = 1;
|
---|
| 1271 |
|
---|
| 1272 | hash = new_section(s1, hash_name, SHT_HASH, hash_sh_flags);
|
---|
| 1273 | hash->sh_entsize = sizeof(int);
|
---|
| 1274 | symtab->hash = hash;
|
---|
| 1275 | hash->link = symtab;
|
---|
| 1276 |
|
---|
| 1277 | ptr = section_ptr_add(hash, (2 + nb_buckets + 1) * sizeof(int));
|
---|
| 1278 | ptr[0] = nb_buckets;
|
---|
| 1279 | ptr[1] = 1;
|
---|
| 1280 | memset(ptr + 2, 0, (nb_buckets + 1) * sizeof(int));
|
---|
| 1281 | return symtab;
|
---|
| 1282 | }
|
---|
| 1283 |
|
---|
| 1284 | /* put dynamic tag */
|
---|
| 1285 | static void put_dt(Section *dynamic, int dt, addr_t val)
|
---|
| 1286 | {
|
---|
| 1287 | ElfW(Dyn) *dyn;
|
---|
| 1288 | dyn = section_ptr_add(dynamic, sizeof(ElfW(Dyn)));
|
---|
| 1289 | dyn->d_tag = dt;
|
---|
| 1290 | dyn->d_un.d_val = val;
|
---|
| 1291 | }
|
---|
| 1292 |
|
---|
| 1293 | static void add_init_array_defines(TCCState *s1, const char *section_name)
|
---|
| 1294 | {
|
---|
| 1295 | Section *s;
|
---|
| 1296 | long end_offset;
|
---|
| 1297 | char sym_start[1024];
|
---|
| 1298 | char sym_end[1024];
|
---|
| 1299 |
|
---|
| 1300 | snprintf(sym_start, sizeof(sym_start), "__%s_start", section_name + 1);
|
---|
| 1301 | snprintf(sym_end, sizeof(sym_end), "__%s_end", section_name + 1);
|
---|
| 1302 |
|
---|
| 1303 | s = find_section(s1, section_name);
|
---|
| 1304 | if (!s) {
|
---|
| 1305 | end_offset = 0;
|
---|
| 1306 | s = data_section;
|
---|
| 1307 | } else {
|
---|
| 1308 | end_offset = s->data_offset;
|
---|
| 1309 | }
|
---|
| 1310 |
|
---|
| 1311 | add_elf_sym(symtab_section,
|
---|
| 1312 | 0, 0,
|
---|
| 1313 | ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
|
---|
| 1314 | s->sh_num, sym_start);
|
---|
| 1315 | add_elf_sym(symtab_section,
|
---|
| 1316 | end_offset, 0,
|
---|
| 1317 | ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
|
---|
| 1318 | s->sh_num, sym_end);
|
---|
| 1319 | }
|
---|
| 1320 |
|
---|
| 1321 | ST_FUNC void tcc_add_bcheck(TCCState *s1)
|
---|
| 1322 | {
|
---|
| 1323 | #ifdef CONFIG_TCC_BCHECK
|
---|
| 1324 | unsigned long *ptr;
|
---|
| 1325 | Section *init_section;
|
---|
| 1326 | unsigned char *pinit;
|
---|
| 1327 | int sym_index;
|
---|
| 1328 |
|
---|
| 1329 | if (0 == s1->do_bounds_check)
|
---|
| 1330 | return;
|
---|
| 1331 |
|
---|
| 1332 | /* XXX: add an object file to do that */
|
---|
| 1333 | ptr = section_ptr_add(bounds_section, sizeof(unsigned long));
|
---|
| 1334 | *ptr = 0;
|
---|
| 1335 | add_elf_sym(symtab_section, 0, 0,
|
---|
| 1336 | ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
|
---|
| 1337 | bounds_section->sh_num, "__bounds_start");
|
---|
| 1338 | #ifdef TCC_TARGET_I386
|
---|
| 1339 | if (s1->output_type != TCC_OUTPUT_MEMORY) {
|
---|
| 1340 | /* add 'call __bound_init()' in .init section */
|
---|
| 1341 | init_section = find_section(s1, ".init");
|
---|
| 1342 | pinit = section_ptr_add(init_section, 5);
|
---|
| 1343 | pinit[0] = 0xe8;
|
---|
| 1344 | put32(pinit + 1, -4);
|
---|
| 1345 | sym_index = find_elf_sym(symtab_section, "__bound_init");
|
---|
| 1346 | put_elf_reloc(symtab_section, init_section,
|
---|
| 1347 | init_section->data_offset - 4, R_386_PC32, sym_index);
|
---|
| 1348 | }
|
---|
| 1349 | #endif
|
---|
| 1350 | #endif
|
---|
| 1351 | }
|
---|
| 1352 |
|
---|
| 1353 | static inline int tcc_add_support(TCCState *s1, const char *filename)
|
---|
| 1354 | {
|
---|
| 1355 | char buf[1024];
|
---|
| 1356 | snprintf(buf, sizeof(buf), "%s/%s", s1->tcc_lib_path, filename);
|
---|
| 1357 | return tcc_add_file(s1, buf);
|
---|
| 1358 | }
|
---|
| 1359 |
|
---|
| 1360 | /* add tcc runtime libraries */
|
---|
| 1361 | ST_FUNC void tcc_add_runtime(TCCState *s1)
|
---|
| 1362 | {
|
---|
| 1363 | tcc_add_bcheck(s1);
|
---|
| 1364 |
|
---|
| 1365 | /* add libc */
|
---|
| 1366 | if (!s1->nostdlib) {
|
---|
| 1367 | tcc_add_library(s1, "c");
|
---|
| 1368 | #ifdef CONFIG_USE_LIBGCC
|
---|
| 1369 | tcc_add_file(s1, TCC_LIBGCC);
|
---|
| 1370 | #elif !defined WITHOUT_LIBTCC
|
---|
| 1371 | tcc_add_support(s1, "libtcc1.a");
|
---|
| 1372 | #endif
|
---|
| 1373 | /* add crt end if not memory output */
|
---|
| 1374 | if (s1->output_type != TCC_OUTPUT_MEMORY)
|
---|
| 1375 | tcc_add_crt(s1, "crtn.o");
|
---|
| 1376 | }
|
---|
| 1377 | }
|
---|
| 1378 |
|
---|
| 1379 | /* add various standard linker symbols (must be done after the
|
---|
| 1380 | sections are filled (for example after allocating common
|
---|
| 1381 | symbols)) */
|
---|
| 1382 | ST_FUNC void tcc_add_linker_symbols(TCCState *s1)
|
---|
| 1383 | {
|
---|
| 1384 | char buf[1024];
|
---|
| 1385 | int i;
|
---|
| 1386 | Section *s;
|
---|
| 1387 |
|
---|
| 1388 | add_elf_sym(symtab_section,
|
---|
| 1389 | text_section->data_offset, 0,
|
---|
| 1390 | ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
|
---|
| 1391 | text_section->sh_num, "_etext");
|
---|
| 1392 | add_elf_sym(symtab_section,
|
---|
| 1393 | data_section->data_offset, 0,
|
---|
| 1394 | ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
|
---|
| 1395 | data_section->sh_num, "_edata");
|
---|
| 1396 | add_elf_sym(symtab_section,
|
---|
| 1397 | bss_section->data_offset, 0,
|
---|
| 1398 | ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
|
---|
| 1399 | bss_section->sh_num, "_end");
|
---|
| 1400 | /* horrible new standard ldscript defines */
|
---|
| 1401 | add_init_array_defines(s1, ".preinit_array");
|
---|
| 1402 | add_init_array_defines(s1, ".init_array");
|
---|
| 1403 | add_init_array_defines(s1, ".fini_array");
|
---|
| 1404 |
|
---|
| 1405 | /* add start and stop symbols for sections whose name can be
|
---|
| 1406 | expressed in C */
|
---|
| 1407 | for(i = 1; i < s1->nb_sections; i++) {
|
---|
| 1408 | s = s1->sections[i];
|
---|
| 1409 | if (s->sh_type == SHT_PROGBITS &&
|
---|
| 1410 | (s->sh_flags & SHF_ALLOC)) {
|
---|
| 1411 | const char *p;
|
---|
| 1412 | int ch;
|
---|
| 1413 |
|
---|
| 1414 | /* check if section name can be expressed in C */
|
---|
| 1415 | p = s->name;
|
---|
| 1416 | for(;;) {
|
---|
| 1417 | ch = *p;
|
---|
| 1418 | if (!ch)
|
---|
| 1419 | break;
|
---|
| 1420 | if (!isid(ch) && !isnum(ch))
|
---|
| 1421 | goto next_sec;
|
---|
| 1422 | p++;
|
---|
| 1423 | }
|
---|
| 1424 | snprintf(buf, sizeof(buf), "__start_%s", s->name);
|
---|
| 1425 | add_elf_sym(symtab_section,
|
---|
| 1426 | 0, 0,
|
---|
| 1427 | ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
|
---|
| 1428 | s->sh_num, buf);
|
---|
| 1429 | snprintf(buf, sizeof(buf), "__stop_%s", s->name);
|
---|
| 1430 | add_elf_sym(symtab_section,
|
---|
| 1431 | s->data_offset, 0,
|
---|
| 1432 | ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
|
---|
| 1433 | s->sh_num, buf);
|
---|
| 1434 | }
|
---|
| 1435 | next_sec: ;
|
---|
| 1436 | }
|
---|
| 1437 | }
|
---|
| 1438 |
|
---|
| 1439 | static void tcc_output_binary(TCCState *s1, FILE *f,
|
---|
| 1440 | const int *section_order)
|
---|
| 1441 | {
|
---|
| 1442 | Section *s;
|
---|
| 1443 | int i, offset, size;
|
---|
| 1444 |
|
---|
| 1445 | offset = 0;
|
---|
| 1446 | for(i=1;i<s1->nb_sections;i++) {
|
---|
| 1447 | s = s1->sections[section_order[i]];
|
---|
| 1448 | if (s->sh_type != SHT_NOBITS &&
|
---|
| 1449 | (s->sh_flags & SHF_ALLOC)) {
|
---|
| 1450 | while (offset < s->sh_offset) {
|
---|
| 1451 | fputc(0, f);
|
---|
| 1452 | offset++;
|
---|
| 1453 | }
|
---|
| 1454 | size = s->sh_size;
|
---|
| 1455 | fwrite(s->data, 1, size, f);
|
---|
| 1456 | offset += size;
|
---|
| 1457 | }
|
---|
| 1458 | }
|
---|
| 1459 | }
|
---|
| 1460 |
|
---|
| 1461 | #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
---|
| 1462 | #define HAVE_PHDR 1
|
---|
| 1463 | #define EXTRA_RELITEMS 14
|
---|
| 1464 |
|
---|
| 1465 | /* move the relocation value from .dynsym to .got */
|
---|
| 1466 | void patch_dynsym_undef(TCCState *s1, Section *s)
|
---|
| 1467 | {
|
---|
| 1468 | uint32_t *gotd = (void *)s1->got->data;
|
---|
| 1469 | ElfW(Sym) *sym, *sym_end;
|
---|
| 1470 |
|
---|
| 1471 | gotd += 3; // dummy entries in .got
|
---|
| 1472 | /* relocate symbols in .dynsym */
|
---|
| 1473 | sym_end = (ElfW(Sym) *)(s->data + s->data_offset);
|
---|
| 1474 | for (sym = (ElfW(Sym) *)s->data + 1; sym < sym_end; sym++) {
|
---|
| 1475 | if (sym->st_shndx == SHN_UNDEF) {
|
---|
| 1476 | *gotd++ = sym->st_value + 6; // XXX 6 is magic ?
|
---|
| 1477 | sym->st_value = 0;
|
---|
| 1478 | }
|
---|
| 1479 | }
|
---|
| 1480 | }
|
---|
| 1481 | #else
|
---|
| 1482 | #define HAVE_PHDR 0
|
---|
| 1483 | #define EXTRA_RELITEMS 9
|
---|
| 1484 |
|
---|
| 1485 | /* zero plt offsets of weak symbols in .dynsym */
|
---|
| 1486 | void patch_dynsym_undef(TCCState *s1, Section *s)
|
---|
| 1487 | {
|
---|
| 1488 | ElfW(Sym) *sym, *sym_end;
|
---|
| 1489 |
|
---|
| 1490 | sym_end = (ElfW(Sym) *)(s->data + s->data_offset);
|
---|
| 1491 | for (sym = (ElfW(Sym) *)s->data + 1; sym < sym_end; sym++)
|
---|
| 1492 | if (sym->st_shndx == SHN_UNDEF && ELFW(ST_BIND)(sym->st_info) == STB_WEAK)
|
---|
| 1493 | sym->st_value = 0;
|
---|
| 1494 | }
|
---|
| 1495 | #endif
|
---|
| 1496 |
|
---|
| 1497 | ST_FUNC void fill_got_entry(TCCState *s1, ElfW_Rel *rel)
|
---|
| 1498 | {
|
---|
| 1499 | int sym_index = ELFW(R_SYM) (rel->r_info);
|
---|
| 1500 | ElfW(Sym) *sym = &((ElfW(Sym) *) symtab_section->data)[sym_index];
|
---|
| 1501 | unsigned long offset;
|
---|
| 1502 |
|
---|
| 1503 | if (sym_index >= s1->nb_sym_attrs)
|
---|
| 1504 | return;
|
---|
| 1505 | offset = s1->sym_attrs[sym_index].got_offset;
|
---|
| 1506 | section_reserve(s1->got, offset + PTR_SIZE);
|
---|
| 1507 | #ifdef TCC_TARGET_X86_64
|
---|
| 1508 | /* only works for x86-64 */
|
---|
| 1509 | put32(s1->got->data + offset + 4, sym->st_value >> 32);
|
---|
| 1510 | #endif
|
---|
| 1511 | put32(s1->got->data + offset, sym->st_value & 0xffffffff);
|
---|
| 1512 | }
|
---|
| 1513 |
|
---|
| 1514 | ST_FUNC void fill_got(TCCState *s1)
|
---|
| 1515 | {
|
---|
| 1516 | Section *s;
|
---|
| 1517 | ElfW_Rel *rel, *rel_end;
|
---|
| 1518 | int i;
|
---|
| 1519 |
|
---|
| 1520 | for(i = 1; i < s1->nb_sections; i++) {
|
---|
| 1521 | s = s1->sections[i];
|
---|
| 1522 | if (s->sh_type != SHT_RELX)
|
---|
| 1523 | continue;
|
---|
| 1524 | /* no need to handle got relocations */
|
---|
| 1525 | if (s->link != symtab_section)
|
---|
| 1526 | continue;
|
---|
| 1527 | rel_end = (ElfW_Rel *) (s->data + s->data_offset);
|
---|
| 1528 | for(rel = (ElfW_Rel *) s->data; rel < rel_end; rel++) {
|
---|
| 1529 | switch (ELFW(R_TYPE) (rel->r_info)) {
|
---|
| 1530 | case R_X86_64_GOT32:
|
---|
| 1531 | case R_X86_64_GOTPCREL:
|
---|
| 1532 | case R_X86_64_PLT32:
|
---|
| 1533 | fill_got_entry(s1, rel);
|
---|
| 1534 | break;
|
---|
| 1535 | }
|
---|
| 1536 | }
|
---|
| 1537 | }
|
---|
| 1538 | }
|
---|
| 1539 |
|
---|
| 1540 |
|
---|
| 1541 | /* output an ELF file */
|
---|
| 1542 | /* XXX: suppress unneeded sections */
|
---|
| 1543 | static int elf_output_file(TCCState *s1, const char *filename)
|
---|
| 1544 | {
|
---|
| 1545 | ElfW(Ehdr) ehdr;
|
---|
| 1546 | FILE *f;
|
---|
| 1547 | int fd, mode, ret;
|
---|
| 1548 | int *section_order;
|
---|
| 1549 | int shnum, i, phnum, file_offset, offset, size, j, sh_order_index, k;
|
---|
| 1550 | long long tmp;
|
---|
| 1551 | addr_t addr;
|
---|
| 1552 | Section *strsec, *s;
|
---|
| 1553 | ElfW(Shdr) shdr, *sh;
|
---|
| 1554 | ElfW(Phdr) *phdr, *ph;
|
---|
| 1555 | Section *interp, *dynamic, *dynstr;
|
---|
| 1556 | unsigned long saved_dynamic_data_offset;
|
---|
| 1557 | ElfW(Sym) *sym;
|
---|
| 1558 | int type, file_type;
|
---|
| 1559 | addr_t rel_addr, rel_size;
|
---|
| 1560 | #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
---|
| 1561 | addr_t bss_addr, bss_size;
|
---|
| 1562 | #endif
|
---|
| 1563 |
|
---|
| 1564 | file_type = s1->output_type;
|
---|
| 1565 | s1->nb_errors = 0;
|
---|
| 1566 |
|
---|
| 1567 | if (file_type != TCC_OUTPUT_OBJ) {
|
---|
| 1568 | tcc_add_runtime(s1);
|
---|
| 1569 | }
|
---|
| 1570 |
|
---|
| 1571 | phdr = NULL;
|
---|
| 1572 | section_order = NULL;
|
---|
| 1573 | interp = NULL;
|
---|
| 1574 | dynamic = NULL;
|
---|
| 1575 | dynstr = NULL; /* avoid warning */
|
---|
| 1576 | saved_dynamic_data_offset = 0; /* avoid warning */
|
---|
| 1577 |
|
---|
| 1578 | if (file_type != TCC_OUTPUT_OBJ) {
|
---|
| 1579 | relocate_common_syms();
|
---|
| 1580 |
|
---|
| 1581 | tcc_add_linker_symbols(s1);
|
---|
| 1582 |
|
---|
| 1583 | if (!s1->static_link) {
|
---|
| 1584 | const char *name;
|
---|
| 1585 | int sym_index, index;
|
---|
| 1586 | ElfW(Sym) *esym, *sym_end;
|
---|
| 1587 |
|
---|
| 1588 | if (file_type == TCC_OUTPUT_EXE) {
|
---|
| 1589 | char *ptr;
|
---|
| 1590 | /* allow override the dynamic loader */
|
---|
| 1591 | const char *elfint = getenv("LD_SO");
|
---|
| 1592 | if (elfint == NULL)
|
---|
| 1593 | elfint = CONFIG_TCC_ELFINTERP;
|
---|
| 1594 | /* add interpreter section only if executable */
|
---|
| 1595 | interp = new_section(s1, ".interp", SHT_PROGBITS, SHF_ALLOC);
|
---|
| 1596 | interp->sh_addralign = 1;
|
---|
| 1597 | ptr = section_ptr_add(interp, 1+strlen(elfint));
|
---|
| 1598 | strcpy(ptr, elfint);
|
---|
| 1599 | }
|
---|
| 1600 |
|
---|
| 1601 | /* add dynamic symbol table */
|
---|
| 1602 | s1->dynsym = new_symtab(s1, ".dynsym", SHT_DYNSYM, SHF_ALLOC,
|
---|
| 1603 | ".dynstr",
|
---|
| 1604 | ".hash", SHF_ALLOC);
|
---|
| 1605 | dynstr = s1->dynsym->link;
|
---|
| 1606 |
|
---|
| 1607 | /* add dynamic section */
|
---|
| 1608 | dynamic = new_section(s1, ".dynamic", SHT_DYNAMIC,
|
---|
| 1609 | SHF_ALLOC | SHF_WRITE);
|
---|
| 1610 | dynamic->link = dynstr;
|
---|
| 1611 | dynamic->sh_entsize = sizeof(ElfW(Dyn));
|
---|
| 1612 |
|
---|
| 1613 | /* add PLT */
|
---|
| 1614 | s1->plt = new_section(s1, ".plt", SHT_PROGBITS,
|
---|
| 1615 | SHF_ALLOC | SHF_EXECINSTR);
|
---|
| 1616 | s1->plt->sh_entsize = 4;
|
---|
| 1617 |
|
---|
| 1618 | build_got(s1);
|
---|
| 1619 |
|
---|
| 1620 | /* scan for undefined symbols and see if they are in the
|
---|
| 1621 | dynamic symbols. If a symbol STT_FUNC or STT_GNU_IFUNC
|
---|
| 1622 | is found, then we add it in the PLT. If a symbol
|
---|
| 1623 | STT_OBJECT is found, we add it in the .bss section with
|
---|
| 1624 | a suitable relocation */
|
---|
| 1625 | sym_end = (ElfW(Sym) *)(symtab_section->data +
|
---|
| 1626 | symtab_section->data_offset);
|
---|
| 1627 | if (file_type == TCC_OUTPUT_EXE) {
|
---|
| 1628 | for(sym = (ElfW(Sym) *)symtab_section->data + 1;
|
---|
| 1629 | sym < sym_end;
|
---|
| 1630 | sym++) {
|
---|
| 1631 | if (sym->st_shndx == SHN_UNDEF) {
|
---|
| 1632 | name = symtab_section->link->data + sym->st_name;
|
---|
| 1633 | sym_index = find_elf_sym(s1->dynsymtab_section, name);
|
---|
| 1634 | if (sym_index) {
|
---|
| 1635 | esym = &((ElfW(Sym) *)s1->dynsymtab_section->data)[sym_index];
|
---|
| 1636 | type = ELFW(ST_TYPE)(esym->st_info);
|
---|
| 1637 | if ((type == STT_FUNC) || (type == STT_GNU_IFUNC)) {
|
---|
| 1638 | /* Indirect functions shall have STT_FUNC type
|
---|
| 1639 | * in executable dynsym section. Indeed, a dlsym
|
---|
| 1640 | * call following a lazy resolution would pick
|
---|
| 1641 | * the symbol value from the executable dynsym
|
---|
| 1642 | * entry which would contain the address of the
|
---|
| 1643 | * function wanted by the caller of dlsym
|
---|
| 1644 | * instead of the address of the function that
|
---|
| 1645 | * would return that address */
|
---|
| 1646 | put_got_entry(s1, R_JMP_SLOT, esym->st_size,
|
---|
| 1647 | ELFW(ST_INFO)(STB_GLOBAL,STT_FUNC),
|
---|
| 1648 | sym - (ElfW(Sym) *)symtab_section->data);
|
---|
| 1649 | } else if (type == STT_OBJECT) {
|
---|
| 1650 | unsigned long offset;
|
---|
| 1651 | ElfW(Sym) *dynsym, *dynsym_end;
|
---|
| 1652 | offset = bss_section->data_offset;
|
---|
| 1653 | /* XXX: which alignment ? */
|
---|
| 1654 | offset = (offset + 16 - 1) & -16;
|
---|
| 1655 | index = put_elf_sym(s1->dynsym, offset, esym->st_size,
|
---|
| 1656 | esym->st_info, 0,
|
---|
| 1657 | bss_section->sh_num, name);
|
---|
| 1658 | // Ensure R_COPY works for weak symbol aliases
|
---|
| 1659 | if (ELFW(ST_BIND)(esym->st_info) == STB_WEAK) {
|
---|
| 1660 | dynsym_end = (ElfW(Sym) *)
|
---|
| 1661 | (s1->dynsymtab_section->data +
|
---|
| 1662 | s1->dynsymtab_section->data_offset);
|
---|
| 1663 | for(dynsym = (ElfW(Sym) *)s1->dynsymtab_section->data + 1;
|
---|
| 1664 | dynsym < dynsym_end; dynsym++) {
|
---|
| 1665 | if ((dynsym->st_value == esym->st_value)
|
---|
| 1666 | && (ELFW(ST_BIND)(dynsym->st_info) == STB_GLOBAL)) {
|
---|
| 1667 | char *dynname;
|
---|
| 1668 | dynname = s1->dynsymtab_section->link->data
|
---|
| 1669 | + dynsym->st_name;
|
---|
| 1670 | put_elf_sym(s1->dynsym, offset,
|
---|
| 1671 | dynsym->st_size,
|
---|
| 1672 | dynsym->st_info, 0,
|
---|
| 1673 | bss_section->sh_num,
|
---|
| 1674 | dynname);
|
---|
| 1675 | break;
|
---|
| 1676 | }
|
---|
| 1677 | }
|
---|
| 1678 | }
|
---|
| 1679 | put_elf_reloc(s1->dynsym, bss_section,
|
---|
| 1680 | offset, R_COPY, index);
|
---|
| 1681 | offset += esym->st_size;
|
---|
| 1682 | bss_section->data_offset = offset;
|
---|
| 1683 | }
|
---|
| 1684 | } else {
|
---|
| 1685 | /* STB_WEAK undefined symbols are accepted */
|
---|
| 1686 | /* XXX: _fp_hw seems to be part of the ABI, so we ignore
|
---|
| 1687 | it */
|
---|
| 1688 | if (ELFW(ST_BIND)(sym->st_info) == STB_WEAK ||
|
---|
| 1689 | !strcmp(name, "_fp_hw")) {
|
---|
| 1690 | } else {
|
---|
| 1691 | tcc_error_noabort("undefined symbol '%s'", name);
|
---|
| 1692 | }
|
---|
| 1693 | }
|
---|
| 1694 | } else if (s1->rdynamic &&
|
---|
| 1695 | ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) {
|
---|
| 1696 | /* if -rdynamic option, then export all non
|
---|
| 1697 | local symbols */
|
---|
| 1698 | name = symtab_section->link->data + sym->st_name;
|
---|
| 1699 | put_elf_sym(s1->dynsym, sym->st_value, sym->st_size,
|
---|
| 1700 | sym->st_info, 0,
|
---|
| 1701 | sym->st_shndx, name);
|
---|
| 1702 | }
|
---|
| 1703 | }
|
---|
| 1704 |
|
---|
| 1705 | if (s1->nb_errors)
|
---|
| 1706 | goto fail;
|
---|
| 1707 |
|
---|
| 1708 | /* now look at unresolved dynamic symbols and export
|
---|
| 1709 | corresponding symbol */
|
---|
| 1710 | sym_end = (ElfW(Sym) *)(s1->dynsymtab_section->data +
|
---|
| 1711 | s1->dynsymtab_section->data_offset);
|
---|
| 1712 | for(esym = (ElfW(Sym) *)s1->dynsymtab_section->data + 1;
|
---|
| 1713 | esym < sym_end;
|
---|
| 1714 | esym++) {
|
---|
| 1715 | if (esym->st_shndx == SHN_UNDEF) {
|
---|
| 1716 | name = s1->dynsymtab_section->link->data + esym->st_name;
|
---|
| 1717 | sym_index = find_elf_sym(symtab_section, name);
|
---|
| 1718 | if (sym_index) {
|
---|
| 1719 | /* XXX: avoid adding a symbol if already
|
---|
| 1720 | present because of -rdynamic ? */
|
---|
| 1721 | sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
|
---|
| 1722 | put_elf_sym(s1->dynsym, sym->st_value, sym->st_size,
|
---|
| 1723 | sym->st_info, 0,
|
---|
| 1724 | sym->st_shndx, name);
|
---|
| 1725 | } else {
|
---|
| 1726 | if (ELFW(ST_BIND)(esym->st_info) == STB_WEAK) {
|
---|
| 1727 | /* weak symbols can stay undefined */
|
---|
| 1728 | } else {
|
---|
| 1729 | tcc_warning("undefined dynamic symbol '%s'", name);
|
---|
| 1730 | }
|
---|
| 1731 | }
|
---|
| 1732 | }
|
---|
| 1733 | }
|
---|
| 1734 | } else {
|
---|
| 1735 | int nb_syms;
|
---|
| 1736 | /* shared library case : we simply export all the global symbols */
|
---|
| 1737 | nb_syms = symtab_section->data_offset / sizeof(ElfW(Sym));
|
---|
| 1738 | s1->symtab_to_dynsym = tcc_mallocz(sizeof(int) * nb_syms);
|
---|
| 1739 | for(sym = (ElfW(Sym) *)symtab_section->data + 1;
|
---|
| 1740 | sym < sym_end;
|
---|
| 1741 | sym++) {
|
---|
| 1742 | if (ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) {
|
---|
| 1743 | #if defined(TCC_OUTPUT_DLL_WITH_PLT)
|
---|
| 1744 | if ((ELFW(ST_TYPE)(sym->st_info) == STT_FUNC ||
|
---|
| 1745 | ELFW(ST_TYPE)(sym->st_info) == STT_GNU_IFUNC)
|
---|
| 1746 | && sym->st_shndx == SHN_UNDEF) {
|
---|
| 1747 | int visibility = ELFW(ST_BIND)(sym->st_info);
|
---|
| 1748 | put_got_entry(s1, R_JMP_SLOT, sym->st_size,
|
---|
| 1749 | ELFW(ST_INFO)(visibility,STT_FUNC),
|
---|
| 1750 | sym - (ElfW(Sym) *)symtab_section->data);
|
---|
| 1751 | }
|
---|
| 1752 | else if (ELFW(ST_TYPE)(sym->st_info) == STT_OBJECT) {
|
---|
| 1753 | put_got_entry(s1, R_X86_64_GLOB_DAT, sym->st_size,
|
---|
| 1754 | sym->st_info,
|
---|
| 1755 | sym - (ElfW(Sym) *)symtab_section->data);
|
---|
| 1756 | }
|
---|
| 1757 | else
|
---|
| 1758 | #endif
|
---|
| 1759 | {
|
---|
| 1760 | name = symtab_section->link->data + sym->st_name;
|
---|
| 1761 | index = put_elf_sym(s1->dynsym, sym->st_value, sym->st_size,
|
---|
| 1762 | sym->st_info, 0,
|
---|
| 1763 | sym->st_shndx, name);
|
---|
| 1764 | s1->symtab_to_dynsym[sym -
|
---|
| 1765 | (ElfW(Sym) *)symtab_section->data] =
|
---|
| 1766 | index;
|
---|
| 1767 | }
|
---|
| 1768 | }
|
---|
| 1769 | }
|
---|
| 1770 | }
|
---|
| 1771 |
|
---|
| 1772 | build_got_entries(s1);
|
---|
| 1773 |
|
---|
| 1774 | /* add a list of needed dlls */
|
---|
| 1775 | for(i = 0; i < s1->nb_loaded_dlls; i++) {
|
---|
| 1776 | DLLReference *dllref = s1->loaded_dlls[i];
|
---|
| 1777 | if (dllref->level == 0)
|
---|
| 1778 | put_dt(dynamic, DT_NEEDED, put_elf_str(dynstr, dllref->name));
|
---|
| 1779 | }
|
---|
| 1780 |
|
---|
| 1781 | if (s1->rpath)
|
---|
| 1782 | put_dt(dynamic, DT_RPATH, put_elf_str(dynstr, s1->rpath));
|
---|
| 1783 |
|
---|
| 1784 | /* XXX: currently, since we do not handle PIC code, we
|
---|
| 1785 | must relocate the readonly segments */
|
---|
| 1786 | if (file_type == TCC_OUTPUT_DLL) {
|
---|
| 1787 | if (s1->soname)
|
---|
| 1788 | put_dt(dynamic, DT_SONAME, put_elf_str(dynstr, s1->soname));
|
---|
| 1789 | put_dt(dynamic, DT_TEXTREL, 0);
|
---|
| 1790 | }
|
---|
| 1791 |
|
---|
| 1792 | if (s1->symbolic)
|
---|
| 1793 | put_dt(dynamic, DT_SYMBOLIC, 0);
|
---|
| 1794 |
|
---|
| 1795 | /* add necessary space for other entries */
|
---|
| 1796 | saved_dynamic_data_offset = dynamic->data_offset;
|
---|
| 1797 | dynamic->data_offset += sizeof(ElfW(Dyn)) * EXTRA_RELITEMS;
|
---|
| 1798 | } else {
|
---|
| 1799 | /* still need to build got entries in case of static link */
|
---|
| 1800 | build_got_entries(s1);
|
---|
| 1801 | }
|
---|
| 1802 | }
|
---|
| 1803 |
|
---|
| 1804 | memset(&ehdr, 0, sizeof(ehdr));
|
---|
| 1805 |
|
---|
| 1806 | /* we add a section for symbols */
|
---|
| 1807 | strsec = new_section(s1, ".shstrtab", SHT_STRTAB, 0);
|
---|
| 1808 | put_elf_str(strsec, "");
|
---|
| 1809 |
|
---|
| 1810 | /* compute number of sections */
|
---|
| 1811 | shnum = s1->nb_sections;
|
---|
| 1812 |
|
---|
| 1813 | /* this array is used to reorder sections in the output file */
|
---|
| 1814 | section_order = tcc_malloc(sizeof(int) * shnum);
|
---|
| 1815 | section_order[0] = 0;
|
---|
| 1816 | sh_order_index = 1;
|
---|
| 1817 |
|
---|
| 1818 | /* compute number of program headers */
|
---|
| 1819 | switch(file_type) {
|
---|
| 1820 | default:
|
---|
| 1821 | case TCC_OUTPUT_OBJ:
|
---|
| 1822 | phnum = 0;
|
---|
| 1823 | break;
|
---|
| 1824 | case TCC_OUTPUT_EXE:
|
---|
| 1825 | if (!s1->static_link)
|
---|
| 1826 | phnum = 4 + HAVE_PHDR;
|
---|
| 1827 | else
|
---|
| 1828 | phnum = 2;
|
---|
| 1829 | break;
|
---|
| 1830 | case TCC_OUTPUT_DLL:
|
---|
| 1831 | phnum = 3;
|
---|
| 1832 | break;
|
---|
| 1833 | }
|
---|
| 1834 |
|
---|
| 1835 | /* allocate strings for section names and decide if an unallocated
|
---|
| 1836 | section should be output */
|
---|
| 1837 | /* NOTE: the strsec section comes last, so its size is also
|
---|
| 1838 | correct ! */
|
---|
| 1839 | for(i = 1; i < s1->nb_sections; i++) {
|
---|
| 1840 | s = s1->sections[i];
|
---|
| 1841 | s->sh_name = put_elf_str(strsec, s->name);
|
---|
| 1842 | #if 0 //gr
|
---|
| 1843 | printf("section: f=%08x t=%08x i=%08x %s %s\n",
|
---|
| 1844 | s->sh_flags,
|
---|
| 1845 | s->sh_type,
|
---|
| 1846 | s->sh_info,
|
---|
| 1847 | s->name,
|
---|
| 1848 | s->reloc ? s->reloc->name : "n"
|
---|
| 1849 | );
|
---|
| 1850 | #endif
|
---|
| 1851 | /* when generating a DLL, we include relocations but we may
|
---|
| 1852 | patch them */
|
---|
| 1853 | if (file_type == TCC_OUTPUT_DLL &&
|
---|
| 1854 | s->sh_type == SHT_RELX &&
|
---|
| 1855 | !(s->sh_flags & SHF_ALLOC)) {
|
---|
| 1856 | /* //gr: avoid bogus relocs for empty (debug) sections */
|
---|
| 1857 | if (s1->sections[s->sh_info]->sh_flags & SHF_ALLOC)
|
---|
| 1858 | prepare_dynamic_rel(s1, s);
|
---|
| 1859 | else if (s1->do_debug)
|
---|
| 1860 | s->sh_size = s->data_offset;
|
---|
| 1861 | } else if (s1->do_debug ||
|
---|
| 1862 | file_type == TCC_OUTPUT_OBJ ||
|
---|
| 1863 | (s->sh_flags & SHF_ALLOC) ||
|
---|
| 1864 | i == (s1->nb_sections - 1)) {
|
---|
| 1865 | /* we output all sections if debug or object file */
|
---|
| 1866 | s->sh_size = s->data_offset;
|
---|
| 1867 | }
|
---|
| 1868 | }
|
---|
| 1869 |
|
---|
| 1870 | /* allocate program segment headers */
|
---|
| 1871 | phdr = tcc_mallocz(phnum * sizeof(ElfW(Phdr)));
|
---|
| 1872 |
|
---|
| 1873 | if (s1->output_format == TCC_OUTPUT_FORMAT_ELF) {
|
---|
| 1874 | file_offset = sizeof(ElfW(Ehdr)) + phnum * sizeof(ElfW(Phdr));
|
---|
| 1875 | } else {
|
---|
| 1876 | file_offset = 0;
|
---|
| 1877 | }
|
---|
| 1878 | if (phnum > 0) {
|
---|
| 1879 | /* compute section to program header mapping */
|
---|
| 1880 | if (s1->has_text_addr) {
|
---|
| 1881 | int a_offset, p_offset;
|
---|
| 1882 | addr = s1->text_addr;
|
---|
| 1883 | /* we ensure that (addr % ELF_PAGE_SIZE) == file_offset %
|
---|
| 1884 | ELF_PAGE_SIZE */
|
---|
| 1885 | a_offset = (int) (addr & (s1->section_align - 1));
|
---|
| 1886 | p_offset = file_offset & (s1->section_align - 1);
|
---|
| 1887 | if (a_offset < p_offset)
|
---|
| 1888 | a_offset += s1->section_align;
|
---|
| 1889 | file_offset += (a_offset - p_offset);
|
---|
| 1890 | } else {
|
---|
| 1891 | if (file_type == TCC_OUTPUT_DLL)
|
---|
| 1892 | addr = 0;
|
---|
| 1893 | else
|
---|
| 1894 | addr = ELF_START_ADDR;
|
---|
| 1895 | /* compute address after headers */
|
---|
| 1896 | addr += (file_offset & (s1->section_align - 1));
|
---|
| 1897 | }
|
---|
| 1898 |
|
---|
| 1899 | /* dynamic relocation table information, for .dynamic section */
|
---|
| 1900 | rel_size = 0;
|
---|
| 1901 | rel_addr = 0;
|
---|
| 1902 |
|
---|
| 1903 | #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
---|
| 1904 | bss_addr = bss_size = 0;
|
---|
| 1905 | #endif
|
---|
| 1906 | /* leave one program header for the program interpreter */
|
---|
| 1907 | ph = &phdr[0];
|
---|
| 1908 | if (interp)
|
---|
| 1909 | ph += 1 + HAVE_PHDR;
|
---|
| 1910 |
|
---|
| 1911 | for(j = 0; j < 2; j++) {
|
---|
| 1912 | ph->p_type = PT_LOAD;
|
---|
| 1913 | if (j == 0)
|
---|
| 1914 | ph->p_flags = PF_R | PF_X;
|
---|
| 1915 | else
|
---|
| 1916 | ph->p_flags = PF_R | PF_W;
|
---|
| 1917 | ph->p_align = s1->section_align;
|
---|
| 1918 |
|
---|
| 1919 | /* we do the following ordering: interp, symbol tables,
|
---|
| 1920 | relocations, progbits, nobits */
|
---|
| 1921 | /* XXX: do faster and simpler sorting */
|
---|
| 1922 | for(k = 0; k < 5; k++) {
|
---|
| 1923 | for(i = 1; i < s1->nb_sections; i++) {
|
---|
| 1924 | s = s1->sections[i];
|
---|
| 1925 | /* compute if section should be included */
|
---|
| 1926 | if (j == 0) {
|
---|
| 1927 | if ((s->sh_flags & (SHF_ALLOC | SHF_WRITE)) !=
|
---|
| 1928 | SHF_ALLOC)
|
---|
| 1929 | continue;
|
---|
| 1930 | } else {
|
---|
| 1931 | if ((s->sh_flags & (SHF_ALLOC | SHF_WRITE)) !=
|
---|
| 1932 | (SHF_ALLOC | SHF_WRITE))
|
---|
| 1933 | continue;
|
---|
| 1934 | }
|
---|
| 1935 | if (s == interp) {
|
---|
| 1936 | if (k != 0)
|
---|
| 1937 | continue;
|
---|
| 1938 | } else if (s->sh_type == SHT_DYNSYM ||
|
---|
| 1939 | s->sh_type == SHT_STRTAB ||
|
---|
| 1940 | s->sh_type == SHT_HASH) {
|
---|
| 1941 | if (k != 1)
|
---|
| 1942 | continue;
|
---|
| 1943 | } else if (s->sh_type == SHT_RELX) {
|
---|
| 1944 | if (k != 2)
|
---|
| 1945 | continue;
|
---|
| 1946 | } else if (s->sh_type == SHT_NOBITS) {
|
---|
| 1947 | if (k != 4)
|
---|
| 1948 | continue;
|
---|
| 1949 | } else {
|
---|
| 1950 | if (k != 3)
|
---|
| 1951 | continue;
|
---|
| 1952 | }
|
---|
| 1953 | section_order[sh_order_index++] = i;
|
---|
| 1954 |
|
---|
| 1955 | /* section matches: we align it and add its size */
|
---|
| 1956 | tmp = addr;
|
---|
| 1957 | addr = (addr + s->sh_addralign - 1) &
|
---|
| 1958 | ~(s->sh_addralign - 1);
|
---|
| 1959 | file_offset += (int) ( addr - tmp );
|
---|
| 1960 | s->sh_offset = file_offset;
|
---|
| 1961 | s->sh_addr = addr;
|
---|
| 1962 |
|
---|
| 1963 | /* update program header infos */
|
---|
| 1964 | if (ph->p_offset == 0) {
|
---|
| 1965 | ph->p_offset = file_offset;
|
---|
| 1966 | ph->p_vaddr = addr;
|
---|
| 1967 | ph->p_paddr = ph->p_vaddr;
|
---|
| 1968 | }
|
---|
| 1969 | /* update dynamic relocation infos */
|
---|
| 1970 | if (s->sh_type == SHT_RELX) {
|
---|
| 1971 | #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
---|
| 1972 | if (!strcmp(strsec->data + s->sh_name, ".rel.got")) { // rel_size == 0) {
|
---|
| 1973 | rel_addr = addr;
|
---|
| 1974 | rel_size += s->sh_size; // XXX only first rel.
|
---|
| 1975 | }
|
---|
| 1976 | if (!strcmp(strsec->data + s->sh_name, ".rel.bss")) { // rel_size == 0) {
|
---|
| 1977 | bss_addr = addr;
|
---|
| 1978 | bss_size = s->sh_size; // XXX only first rel.
|
---|
| 1979 | }
|
---|
| 1980 | #else
|
---|
| 1981 | if (rel_size == 0)
|
---|
| 1982 | rel_addr = addr;
|
---|
| 1983 | rel_size += s->sh_size;
|
---|
| 1984 | #endif
|
---|
| 1985 | }
|
---|
| 1986 | addr += s->sh_size;
|
---|
| 1987 | if (s->sh_type != SHT_NOBITS)
|
---|
| 1988 | file_offset += s->sh_size;
|
---|
| 1989 | }
|
---|
| 1990 | }
|
---|
| 1991 | ph->p_filesz = file_offset - ph->p_offset;
|
---|
| 1992 | ph->p_memsz = addr - ph->p_vaddr;
|
---|
| 1993 | ph++;
|
---|
| 1994 | if (j == 0) {
|
---|
| 1995 | if (s1->output_format == TCC_OUTPUT_FORMAT_ELF) {
|
---|
| 1996 | /* if in the middle of a page, we duplicate the page in
|
---|
| 1997 | memory so that one copy is RX and the other is RW */
|
---|
| 1998 | if ((addr & (s1->section_align - 1)) != 0)
|
---|
| 1999 | addr += s1->section_align;
|
---|
| 2000 | } else {
|
---|
| 2001 | addr = (addr + s1->section_align - 1) & ~(s1->section_align - 1);
|
---|
| 2002 | file_offset = (file_offset + s1->section_align - 1) &
|
---|
| 2003 | ~(s1->section_align - 1);
|
---|
| 2004 | }
|
---|
| 2005 | }
|
---|
| 2006 | }
|
---|
| 2007 |
|
---|
| 2008 | /* if interpreter, then add corresponing program header */
|
---|
| 2009 | if (interp) {
|
---|
| 2010 | ph = &phdr[0];
|
---|
| 2011 |
|
---|
| 2012 | #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
---|
| 2013 | {
|
---|
| 2014 | int len = phnum * sizeof(ElfW(Phdr));
|
---|
| 2015 |
|
---|
| 2016 | ph->p_type = PT_PHDR;
|
---|
| 2017 | ph->p_offset = sizeof(ElfW(Ehdr));
|
---|
| 2018 | ph->p_vaddr = interp->sh_addr - len;
|
---|
| 2019 | ph->p_paddr = ph->p_vaddr;
|
---|
| 2020 | ph->p_filesz = ph->p_memsz = len;
|
---|
| 2021 | ph->p_flags = PF_R | PF_X;
|
---|
| 2022 | ph->p_align = 4; // interp->sh_addralign;
|
---|
| 2023 | ph++;
|
---|
| 2024 | }
|
---|
| 2025 | #endif
|
---|
| 2026 |
|
---|
| 2027 | ph->p_type = PT_INTERP;
|
---|
| 2028 | ph->p_offset = interp->sh_offset;
|
---|
| 2029 | ph->p_vaddr = interp->sh_addr;
|
---|
| 2030 | ph->p_paddr = ph->p_vaddr;
|
---|
| 2031 | ph->p_filesz = interp->sh_size;
|
---|
| 2032 | ph->p_memsz = interp->sh_size;
|
---|
| 2033 | ph->p_flags = PF_R;
|
---|
| 2034 | ph->p_align = interp->sh_addralign;
|
---|
| 2035 | }
|
---|
| 2036 |
|
---|
| 2037 | /* if dynamic section, then add corresponing program header */
|
---|
| 2038 | if (dynamic) {
|
---|
| 2039 | ElfW(Sym) *sym_end;
|
---|
| 2040 |
|
---|
| 2041 | ph = &phdr[phnum - 1];
|
---|
| 2042 |
|
---|
| 2043 | ph->p_type = PT_DYNAMIC;
|
---|
| 2044 | ph->p_offset = dynamic->sh_offset;
|
---|
| 2045 | ph->p_vaddr = dynamic->sh_addr;
|
---|
| 2046 | ph->p_paddr = ph->p_vaddr;
|
---|
| 2047 | ph->p_filesz = dynamic->sh_size;
|
---|
| 2048 | ph->p_memsz = dynamic->sh_size;
|
---|
| 2049 | ph->p_flags = PF_R | PF_W;
|
---|
| 2050 | ph->p_align = dynamic->sh_addralign;
|
---|
| 2051 |
|
---|
| 2052 | /* put GOT dynamic section address */
|
---|
| 2053 | put32(s1->got->data, dynamic->sh_addr);
|
---|
| 2054 |
|
---|
| 2055 | /* relocate the PLT */
|
---|
| 2056 | if (file_type == TCC_OUTPUT_EXE
|
---|
| 2057 | #if defined(TCC_OUTPUT_DLL_WITH_PLT)
|
---|
| 2058 | || file_type == TCC_OUTPUT_DLL
|
---|
| 2059 | #endif
|
---|
| 2060 | ) {
|
---|
| 2061 | uint8_t *p, *p_end;
|
---|
| 2062 |
|
---|
| 2063 | p = s1->plt->data;
|
---|
| 2064 | p_end = p + s1->plt->data_offset;
|
---|
| 2065 | if (p < p_end) {
|
---|
| 2066 | #if defined(TCC_TARGET_I386)
|
---|
| 2067 | put32(p + 2, get32(p + 2) + s1->got->sh_addr);
|
---|
| 2068 | put32(p + 8, get32(p + 8) + s1->got->sh_addr);
|
---|
| 2069 | p += 16;
|
---|
| 2070 | while (p < p_end) {
|
---|
| 2071 | put32(p + 2, get32(p + 2) + s1->got->sh_addr);
|
---|
| 2072 | p += 16;
|
---|
| 2073 | }
|
---|
| 2074 | #elif defined(TCC_TARGET_X86_64)
|
---|
| 2075 | int x = s1->got->sh_addr - s1->plt->sh_addr - 6;
|
---|
| 2076 | put32(p + 2, get32(p + 2) + x);
|
---|
| 2077 | put32(p + 8, get32(p + 8) + x - 6);
|
---|
| 2078 | p += 16;
|
---|
| 2079 | while (p < p_end) {
|
---|
| 2080 | put32(p + 2, get32(p + 2) + x + s1->plt->data - p);
|
---|
| 2081 | p += 16;
|
---|
| 2082 | }
|
---|
| 2083 | #elif defined(TCC_TARGET_ARM)
|
---|
| 2084 | int x;
|
---|
| 2085 | x=s1->got->sh_addr - s1->plt->sh_addr - 12;
|
---|
| 2086 | p += 16;
|
---|
| 2087 | while (p < p_end) {
|
---|
| 2088 | if (get32(p) == 0x46c04778) /* PLT Thumb stub present */
|
---|
| 2089 | p += 4;
|
---|
| 2090 | put32(p + 12, x + get32(p + 12) + s1->plt->data - p);
|
---|
| 2091 | p += 16;
|
---|
| 2092 | }
|
---|
| 2093 | #elif defined(TCC_TARGET_C67)
|
---|
| 2094 | /* XXX: TODO */
|
---|
| 2095 | #elif defined(TCC_TARGET_IL)
|
---|
| 2096 | #else
|
---|
| 2097 | #error unsupported CPU
|
---|
| 2098 | #endif
|
---|
| 2099 | }
|
---|
| 2100 | }
|
---|
| 2101 |
|
---|
| 2102 | /* relocate symbols in .dynsym */
|
---|
| 2103 | sym_end = (ElfW(Sym) *)(s1->dynsym->data + s1->dynsym->data_offset);
|
---|
| 2104 | for(sym = (ElfW(Sym) *)s1->dynsym->data + 1;
|
---|
| 2105 | sym < sym_end;
|
---|
| 2106 | sym++) {
|
---|
| 2107 | if (sym->st_shndx == SHN_UNDEF) {
|
---|
| 2108 | /* relocate to the PLT if the symbol corresponds
|
---|
| 2109 | to a PLT entry */
|
---|
| 2110 | if (sym->st_value)
|
---|
| 2111 | sym->st_value += s1->plt->sh_addr;
|
---|
| 2112 | } else if (sym->st_shndx < SHN_LORESERVE) {
|
---|
| 2113 | /* do symbol relocation */
|
---|
| 2114 | sym->st_value += s1->sections[sym->st_shndx]->sh_addr;
|
---|
| 2115 | }
|
---|
| 2116 | }
|
---|
| 2117 |
|
---|
| 2118 | /* put dynamic section entries */
|
---|
| 2119 | dynamic->data_offset = saved_dynamic_data_offset;
|
---|
| 2120 | put_dt(dynamic, DT_HASH, s1->dynsym->hash->sh_addr);
|
---|
| 2121 | put_dt(dynamic, DT_STRTAB, dynstr->sh_addr);
|
---|
| 2122 | put_dt(dynamic, DT_SYMTAB, s1->dynsym->sh_addr);
|
---|
| 2123 | put_dt(dynamic, DT_STRSZ, dynstr->data_offset);
|
---|
| 2124 | put_dt(dynamic, DT_SYMENT, sizeof(ElfW(Sym)));
|
---|
| 2125 | #ifdef TCC_TARGET_X86_64
|
---|
| 2126 | put_dt(dynamic, DT_RELA, rel_addr);
|
---|
| 2127 | put_dt(dynamic, DT_RELASZ, rel_size);
|
---|
| 2128 | put_dt(dynamic, DT_RELAENT, sizeof(ElfW_Rel));
|
---|
| 2129 | #else
|
---|
| 2130 | #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
---|
| 2131 | put_dt(dynamic, DT_PLTGOT, s1->got->sh_addr);
|
---|
| 2132 | put_dt(dynamic, DT_PLTRELSZ, rel_size);
|
---|
| 2133 | put_dt(dynamic, DT_JMPREL, rel_addr);
|
---|
| 2134 | put_dt(dynamic, DT_PLTREL, DT_REL);
|
---|
| 2135 | put_dt(dynamic, DT_REL, bss_addr);
|
---|
| 2136 | put_dt(dynamic, DT_RELSZ, bss_size);
|
---|
| 2137 | #else
|
---|
| 2138 | put_dt(dynamic, DT_REL, rel_addr);
|
---|
| 2139 | put_dt(dynamic, DT_RELSZ, rel_size);
|
---|
| 2140 | put_dt(dynamic, DT_RELENT, sizeof(ElfW_Rel));
|
---|
| 2141 | #endif
|
---|
| 2142 | #endif
|
---|
| 2143 | if (s1->do_debug)
|
---|
| 2144 | put_dt(dynamic, DT_DEBUG, 0);
|
---|
| 2145 | put_dt(dynamic, DT_NULL, 0);
|
---|
| 2146 | }
|
---|
| 2147 |
|
---|
| 2148 | ehdr.e_phentsize = sizeof(ElfW(Phdr));
|
---|
| 2149 | ehdr.e_phnum = phnum;
|
---|
| 2150 | ehdr.e_phoff = sizeof(ElfW(Ehdr));
|
---|
| 2151 | }
|
---|
| 2152 |
|
---|
| 2153 | /* all other sections come after */
|
---|
| 2154 | for(i = 1; i < s1->nb_sections; i++) {
|
---|
| 2155 | s = s1->sections[i];
|
---|
| 2156 | if (phnum > 0 && (s->sh_flags & SHF_ALLOC))
|
---|
| 2157 | continue;
|
---|
| 2158 | section_order[sh_order_index++] = i;
|
---|
| 2159 |
|
---|
| 2160 | file_offset = (file_offset + s->sh_addralign - 1) &
|
---|
| 2161 | ~(s->sh_addralign - 1);
|
---|
| 2162 | s->sh_offset = file_offset;
|
---|
| 2163 | if (s->sh_type != SHT_NOBITS)
|
---|
| 2164 | file_offset += s->sh_size;
|
---|
| 2165 | }
|
---|
| 2166 |
|
---|
| 2167 | /* if building executable or DLL, then relocate each section
|
---|
| 2168 | except the GOT which is already relocated */
|
---|
| 2169 | if (file_type != TCC_OUTPUT_OBJ) {
|
---|
| 2170 | relocate_syms(s1, 0);
|
---|
| 2171 |
|
---|
| 2172 | if (s1->nb_errors != 0) {
|
---|
| 2173 | fail:
|
---|
| 2174 | ret = -1;
|
---|
| 2175 | goto the_end;
|
---|
| 2176 | }
|
---|
| 2177 |
|
---|
| 2178 | /* relocate sections */
|
---|
| 2179 | /* XXX: ignore sections with allocated relocations ? */
|
---|
| 2180 | for(i = 1; i < s1->nb_sections; i++) {
|
---|
| 2181 | s = s1->sections[i];
|
---|
| 2182 | if (s->reloc && s != s1->got)
|
---|
| 2183 | relocate_section(s1, s);
|
---|
| 2184 | }
|
---|
| 2185 |
|
---|
| 2186 | /* relocate relocation entries if the relocation tables are
|
---|
| 2187 | allocated in the executable */
|
---|
| 2188 | for(i = 1; i < s1->nb_sections; i++) {
|
---|
| 2189 | s = s1->sections[i];
|
---|
| 2190 | if ((s->sh_flags & SHF_ALLOC) &&
|
---|
| 2191 | s->sh_type == SHT_RELX) {
|
---|
| 2192 | relocate_rel(s1, s);
|
---|
| 2193 | }
|
---|
| 2194 | }
|
---|
| 2195 |
|
---|
| 2196 | /* get entry point address */
|
---|
| 2197 | if (file_type == TCC_OUTPUT_EXE)
|
---|
| 2198 | ehdr.e_entry = get_elf_sym_addr(s1, "_start", 1);
|
---|
| 2199 | else
|
---|
| 2200 | ehdr.e_entry = text_section->sh_addr; /* XXX: is it correct ? */
|
---|
| 2201 | }
|
---|
| 2202 | if (file_type == TCC_OUTPUT_EXE && s1->static_link)
|
---|
| 2203 | fill_got(s1);
|
---|
| 2204 |
|
---|
| 2205 | /* write elf file */
|
---|
| 2206 | if (file_type == TCC_OUTPUT_OBJ)
|
---|
| 2207 | mode = 0666;
|
---|
| 2208 | else
|
---|
| 2209 | mode = 0777;
|
---|
| 2210 | unlink(filename);
|
---|
| 2211 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, mode);
|
---|
| 2212 | if (fd < 0) {
|
---|
| 2213 | tcc_error_noabort("could not write '%s'", filename);
|
---|
| 2214 | goto fail;
|
---|
| 2215 | }
|
---|
| 2216 | f = fdopen(fd, "wb");
|
---|
| 2217 | if (s1->verbose)
|
---|
| 2218 | printf("<- %s\n", filename);
|
---|
| 2219 |
|
---|
| 2220 | #ifdef TCC_TARGET_COFF
|
---|
| 2221 | if (s1->output_format == TCC_OUTPUT_FORMAT_COFF) {
|
---|
| 2222 | tcc_output_coff(s1, f);
|
---|
| 2223 | } else
|
---|
| 2224 | #endif
|
---|
| 2225 | if (s1->output_format == TCC_OUTPUT_FORMAT_ELF) {
|
---|
| 2226 | sort_syms(s1, symtab_section);
|
---|
| 2227 |
|
---|
| 2228 | /* align to 4 */
|
---|
| 2229 | file_offset = (file_offset + 3) & -4;
|
---|
| 2230 |
|
---|
| 2231 | /* fill header */
|
---|
| 2232 | ehdr.e_ident[0] = ELFMAG0;
|
---|
| 2233 | ehdr.e_ident[1] = ELFMAG1;
|
---|
| 2234 | ehdr.e_ident[2] = ELFMAG2;
|
---|
| 2235 | ehdr.e_ident[3] = ELFMAG3;
|
---|
| 2236 | ehdr.e_ident[4] = ELFCLASSW;
|
---|
| 2237 | ehdr.e_ident[5] = ELFDATA2LSB;
|
---|
| 2238 | ehdr.e_ident[6] = EV_CURRENT;
|
---|
| 2239 | #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
---|
| 2240 | ehdr.e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
|
---|
| 2241 | #endif
|
---|
| 2242 | #ifdef TCC_TARGET_ARM
|
---|
| 2243 | #ifdef TCC_ARM_EABI
|
---|
| 2244 | ehdr.e_ident[EI_OSABI] = 0;
|
---|
| 2245 | ehdr.e_flags = 4 << 24;
|
---|
| 2246 | #else
|
---|
| 2247 | ehdr.e_ident[EI_OSABI] = ELFOSABI_ARM;
|
---|
| 2248 | #endif
|
---|
| 2249 | #endif
|
---|
| 2250 | switch(file_type) {
|
---|
| 2251 | default:
|
---|
| 2252 | case TCC_OUTPUT_EXE:
|
---|
| 2253 | ehdr.e_type = ET_EXEC;
|
---|
| 2254 | break;
|
---|
| 2255 | case TCC_OUTPUT_DLL:
|
---|
| 2256 | ehdr.e_type = ET_DYN;
|
---|
| 2257 | break;
|
---|
| 2258 | case TCC_OUTPUT_OBJ:
|
---|
| 2259 | ehdr.e_type = ET_REL;
|
---|
| 2260 | break;
|
---|
| 2261 | }
|
---|
| 2262 | ehdr.e_machine = EM_TCC_TARGET;
|
---|
| 2263 | ehdr.e_version = EV_CURRENT;
|
---|
| 2264 | ehdr.e_shoff = file_offset;
|
---|
| 2265 | ehdr.e_ehsize = sizeof(ElfW(Ehdr));
|
---|
| 2266 | ehdr.e_shentsize = sizeof(ElfW(Shdr));
|
---|
| 2267 | ehdr.e_shnum = shnum;
|
---|
| 2268 | ehdr.e_shstrndx = shnum - 1;
|
---|
| 2269 |
|
---|
| 2270 | fwrite(&ehdr, 1, sizeof(ElfW(Ehdr)), f);
|
---|
| 2271 | fwrite(phdr, 1, phnum * sizeof(ElfW(Phdr)), f);
|
---|
| 2272 | offset = sizeof(ElfW(Ehdr)) + phnum * sizeof(ElfW(Phdr));
|
---|
| 2273 |
|
---|
| 2274 | for(i=1;i<s1->nb_sections;i++) {
|
---|
| 2275 | s = s1->sections[section_order[i]];
|
---|
| 2276 | if (s->sh_type != SHT_NOBITS) {
|
---|
| 2277 | if (s->sh_type == SHT_DYNSYM)
|
---|
| 2278 | patch_dynsym_undef(s1, s);
|
---|
| 2279 | while (offset < s->sh_offset) {
|
---|
| 2280 | fputc(0, f);
|
---|
| 2281 | offset++;
|
---|
| 2282 | }
|
---|
| 2283 | size = s->sh_size;
|
---|
| 2284 | fwrite(s->data, 1, size, f);
|
---|
| 2285 | offset += size;
|
---|
| 2286 | }
|
---|
| 2287 | }
|
---|
| 2288 |
|
---|
| 2289 | /* output section headers */
|
---|
| 2290 | while (offset < ehdr.e_shoff) {
|
---|
| 2291 | fputc(0, f);
|
---|
| 2292 | offset++;
|
---|
| 2293 | }
|
---|
| 2294 |
|
---|
| 2295 | for(i=0;i<s1->nb_sections;i++) {
|
---|
| 2296 | sh = &shdr;
|
---|
| 2297 | memset(sh, 0, sizeof(ElfW(Shdr)));
|
---|
| 2298 | s = s1->sections[i];
|
---|
| 2299 | if (s) {
|
---|
| 2300 | sh->sh_name = s->sh_name;
|
---|
| 2301 | sh->sh_type = s->sh_type;
|
---|
| 2302 | sh->sh_flags = s->sh_flags;
|
---|
| 2303 | sh->sh_entsize = s->sh_entsize;
|
---|
| 2304 | sh->sh_info = s->sh_info;
|
---|
| 2305 | if (s->link)
|
---|
| 2306 | sh->sh_link = s->link->sh_num;
|
---|
| 2307 | sh->sh_addralign = s->sh_addralign;
|
---|
| 2308 | sh->sh_addr = s->sh_addr;
|
---|
| 2309 | sh->sh_offset = s->sh_offset;
|
---|
| 2310 | sh->sh_size = s->sh_size;
|
---|
| 2311 | }
|
---|
| 2312 | fwrite(sh, 1, sizeof(ElfW(Shdr)), f);
|
---|
| 2313 | }
|
---|
| 2314 | } else {
|
---|
| 2315 | tcc_output_binary(s1, f, section_order);
|
---|
| 2316 | }
|
---|
| 2317 | fclose(f);
|
---|
| 2318 |
|
---|
| 2319 | ret = 0;
|
---|
| 2320 | the_end:
|
---|
| 2321 | tcc_free(s1->symtab_to_dynsym);
|
---|
| 2322 | tcc_free(section_order);
|
---|
| 2323 | tcc_free(phdr);
|
---|
| 2324 | tcc_free(s1->sym_attrs);
|
---|
| 2325 | return ret;
|
---|
| 2326 | }
|
---|
| 2327 |
|
---|
| 2328 | LIBTCCAPI int tcc_output_file(TCCState *s, const char *filename)
|
---|
| 2329 | {
|
---|
| 2330 | int ret;
|
---|
| 2331 | #ifdef TCC_TARGET_PE
|
---|
| 2332 | if (s->output_type != TCC_OUTPUT_OBJ) {
|
---|
| 2333 | ret = pe_output_file(s, filename);
|
---|
| 2334 | } else
|
---|
| 2335 | #endif
|
---|
| 2336 | {
|
---|
| 2337 | ret = elf_output_file(s, filename);
|
---|
| 2338 | }
|
---|
| 2339 | return ret;
|
---|
| 2340 | }
|
---|
| 2341 |
|
---|
| 2342 | static void *load_data(int fd, unsigned long file_offset, unsigned long size)
|
---|
| 2343 | {
|
---|
| 2344 | void *data;
|
---|
| 2345 |
|
---|
| 2346 | data = tcc_malloc(size);
|
---|
| 2347 | lseek(fd, file_offset, SEEK_SET);
|
---|
| 2348 | read(fd, data, size);
|
---|
| 2349 | return data;
|
---|
| 2350 | }
|
---|
| 2351 |
|
---|
| 2352 | typedef struct SectionMergeInfo {
|
---|
| 2353 | Section *s; /* corresponding existing section */
|
---|
| 2354 | unsigned long offset; /* offset of the new section in the existing section */
|
---|
| 2355 | uint8_t new_section; /* true if section 's' was added */
|
---|
| 2356 | uint8_t link_once; /* true if link once section */
|
---|
| 2357 | } SectionMergeInfo;
|
---|
| 2358 |
|
---|
| 2359 | /* load an object file and merge it with current files */
|
---|
| 2360 | /* XXX: handle correctly stab (debug) info */
|
---|
| 2361 | ST_FUNC int tcc_load_object_file(TCCState *s1,
|
---|
| 2362 | int fd, unsigned long file_offset)
|
---|
| 2363 | {
|
---|
| 2364 | ElfW(Ehdr) ehdr;
|
---|
| 2365 | ElfW(Shdr) *shdr, *sh;
|
---|
| 2366 | int size, i, j, offset, offseti, nb_syms, sym_index, ret;
|
---|
| 2367 | unsigned char *strsec, *strtab;
|
---|
| 2368 | int *old_to_new_syms;
|
---|
| 2369 | char *sh_name, *name;
|
---|
| 2370 | SectionMergeInfo *sm_table, *sm;
|
---|
| 2371 | ElfW(Sym) *sym, *symtab;
|
---|
| 2372 | ElfW_Rel *rel, *rel_end;
|
---|
| 2373 | Section *s;
|
---|
| 2374 |
|
---|
| 2375 | int stab_index;
|
---|
| 2376 | int stabstr_index;
|
---|
| 2377 |
|
---|
| 2378 | stab_index = stabstr_index = 0;
|
---|
| 2379 |
|
---|
| 2380 | if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
|
---|
| 2381 | goto fail1;
|
---|
| 2382 | if (ehdr.e_ident[0] != ELFMAG0 ||
|
---|
| 2383 | ehdr.e_ident[1] != ELFMAG1 ||
|
---|
| 2384 | ehdr.e_ident[2] != ELFMAG2 ||
|
---|
| 2385 | ehdr.e_ident[3] != ELFMAG3)
|
---|
| 2386 | goto fail1;
|
---|
| 2387 | /* test if object file */
|
---|
| 2388 | if (ehdr.e_type != ET_REL)
|
---|
| 2389 | goto fail1;
|
---|
| 2390 | /* test CPU specific stuff */
|
---|
| 2391 | if (ehdr.e_ident[5] != ELFDATA2LSB ||
|
---|
| 2392 | ehdr.e_machine != EM_TCC_TARGET) {
|
---|
| 2393 | fail1:
|
---|
| 2394 | tcc_error_noabort("invalid object file");
|
---|
| 2395 | return -1;
|
---|
| 2396 | }
|
---|
| 2397 | /* read sections */
|
---|
| 2398 | shdr = load_data(fd, file_offset + ehdr.e_shoff,
|
---|
| 2399 | sizeof(ElfW(Shdr)) * ehdr.e_shnum);
|
---|
| 2400 | sm_table = tcc_mallocz(sizeof(SectionMergeInfo) * ehdr.e_shnum);
|
---|
| 2401 |
|
---|
| 2402 | /* load section names */
|
---|
| 2403 | sh = &shdr[ehdr.e_shstrndx];
|
---|
| 2404 | strsec = load_data(fd, file_offset + sh->sh_offset, sh->sh_size);
|
---|
| 2405 |
|
---|
| 2406 | /* load symtab and strtab */
|
---|
| 2407 | old_to_new_syms = NULL;
|
---|
| 2408 | symtab = NULL;
|
---|
| 2409 | strtab = NULL;
|
---|
| 2410 | nb_syms = 0;
|
---|
| 2411 | for(i = 1; i < ehdr.e_shnum; i++) {
|
---|
| 2412 | sh = &shdr[i];
|
---|
| 2413 | if (sh->sh_type == SHT_SYMTAB) {
|
---|
| 2414 | if (symtab) {
|
---|
| 2415 | tcc_error_noabort("object must contain only one symtab");
|
---|
| 2416 | fail:
|
---|
| 2417 | ret = -1;
|
---|
| 2418 | goto the_end;
|
---|
| 2419 | }
|
---|
| 2420 | nb_syms = sh->sh_size / sizeof(ElfW(Sym));
|
---|
| 2421 | symtab = load_data(fd, file_offset + sh->sh_offset, sh->sh_size);
|
---|
| 2422 | sm_table[i].s = symtab_section;
|
---|
| 2423 |
|
---|
| 2424 | /* now load strtab */
|
---|
| 2425 | sh = &shdr[sh->sh_link];
|
---|
| 2426 | strtab = load_data(fd, file_offset + sh->sh_offset, sh->sh_size);
|
---|
| 2427 | }
|
---|
| 2428 | }
|
---|
| 2429 |
|
---|
| 2430 | /* now examine each section and try to merge its content with the
|
---|
| 2431 | ones in memory */
|
---|
| 2432 | for(i = 1; i < ehdr.e_shnum; i++) {
|
---|
| 2433 | /* no need to examine section name strtab */
|
---|
| 2434 | if (i == ehdr.e_shstrndx)
|
---|
| 2435 | continue;
|
---|
| 2436 | sh = &shdr[i];
|
---|
| 2437 | sh_name = strsec + sh->sh_name;
|
---|
| 2438 | /* ignore sections types we do not handle */
|
---|
| 2439 | if (sh->sh_type != SHT_PROGBITS &&
|
---|
| 2440 | sh->sh_type != SHT_RELX &&
|
---|
| 2441 | #ifdef TCC_ARM_EABI
|
---|
| 2442 | sh->sh_type != SHT_ARM_EXIDX &&
|
---|
| 2443 | #endif
|
---|
| 2444 | sh->sh_type != SHT_NOBITS &&
|
---|
| 2445 | sh->sh_type != SHT_PREINIT_ARRAY &&
|
---|
| 2446 | sh->sh_type != SHT_INIT_ARRAY &&
|
---|
| 2447 | sh->sh_type != SHT_FINI_ARRAY &&
|
---|
| 2448 | strcmp(sh_name, ".stabstr")
|
---|
| 2449 | )
|
---|
| 2450 | continue;
|
---|
| 2451 | if (sh->sh_addralign < 1)
|
---|
| 2452 | sh->sh_addralign = 1;
|
---|
| 2453 | /* find corresponding section, if any */
|
---|
| 2454 | for(j = 1; j < s1->nb_sections;j++) {
|
---|
| 2455 | s = s1->sections[j];
|
---|
| 2456 | if (!strcmp(s->name, sh_name)) {
|
---|
| 2457 | if (!strncmp(sh_name, ".gnu.linkonce",
|
---|
| 2458 | sizeof(".gnu.linkonce") - 1)) {
|
---|
| 2459 | /* if a 'linkonce' section is already present, we
|
---|
| 2460 | do not add it again. It is a little tricky as
|
---|
| 2461 | symbols can still be defined in
|
---|
| 2462 | it. */
|
---|
| 2463 | sm_table[i].link_once = 1;
|
---|
| 2464 | goto next;
|
---|
| 2465 | } else {
|
---|
| 2466 | goto found;
|
---|
| 2467 | }
|
---|
| 2468 | }
|
---|
| 2469 | }
|
---|
| 2470 | /* not found: create new section */
|
---|
| 2471 | s = new_section(s1, sh_name, sh->sh_type, sh->sh_flags);
|
---|
| 2472 | /* take as much info as possible from the section. sh_link and
|
---|
| 2473 | sh_info will be updated later */
|
---|
| 2474 | s->sh_addralign = sh->sh_addralign;
|
---|
| 2475 | s->sh_entsize = sh->sh_entsize;
|
---|
| 2476 | sm_table[i].new_section = 1;
|
---|
| 2477 | found:
|
---|
| 2478 | if (sh->sh_type != s->sh_type) {
|
---|
| 2479 | tcc_error_noabort("invalid section type");
|
---|
| 2480 | goto fail;
|
---|
| 2481 | }
|
---|
| 2482 |
|
---|
| 2483 | /* align start of section */
|
---|
| 2484 | offset = s->data_offset;
|
---|
| 2485 |
|
---|
| 2486 | if (0 == strcmp(sh_name, ".stab")) {
|
---|
| 2487 | stab_index = i;
|
---|
| 2488 | goto no_align;
|
---|
| 2489 | }
|
---|
| 2490 | if (0 == strcmp(sh_name, ".stabstr")) {
|
---|
| 2491 | stabstr_index = i;
|
---|
| 2492 | goto no_align;
|
---|
| 2493 | }
|
---|
| 2494 |
|
---|
| 2495 | size = sh->sh_addralign - 1;
|
---|
| 2496 | offset = (offset + size) & ~size;
|
---|
| 2497 | if (sh->sh_addralign > s->sh_addralign)
|
---|
| 2498 | s->sh_addralign = sh->sh_addralign;
|
---|
| 2499 | s->data_offset = offset;
|
---|
| 2500 | no_align:
|
---|
| 2501 | sm_table[i].offset = offset;
|
---|
| 2502 | sm_table[i].s = s;
|
---|
| 2503 | /* concatenate sections */
|
---|
| 2504 | size = sh->sh_size;
|
---|
| 2505 | if (sh->sh_type != SHT_NOBITS) {
|
---|
| 2506 | unsigned char *ptr;
|
---|
| 2507 | lseek(fd, file_offset + sh->sh_offset, SEEK_SET);
|
---|
| 2508 | ptr = section_ptr_add(s, size);
|
---|
| 2509 | read(fd, ptr, size);
|
---|
| 2510 | } else {
|
---|
| 2511 | s->data_offset += size;
|
---|
| 2512 | }
|
---|
| 2513 | next: ;
|
---|
| 2514 | }
|
---|
| 2515 |
|
---|
| 2516 | /* //gr relocate stab strings */
|
---|
| 2517 | if (stab_index && stabstr_index) {
|
---|
| 2518 | Stab_Sym *a, *b;
|
---|
| 2519 | unsigned o;
|
---|
| 2520 | s = sm_table[stab_index].s;
|
---|
| 2521 | a = (Stab_Sym *)(s->data + sm_table[stab_index].offset);
|
---|
| 2522 | b = (Stab_Sym *)(s->data + s->data_offset);
|
---|
| 2523 | o = sm_table[stabstr_index].offset;
|
---|
| 2524 | while (a < b)
|
---|
| 2525 | a->n_strx += o, a++;
|
---|
| 2526 | }
|
---|
| 2527 |
|
---|
| 2528 | /* second short pass to update sh_link and sh_info fields of new
|
---|
| 2529 | sections */
|
---|
| 2530 | for(i = 1; i < ehdr.e_shnum; i++) {
|
---|
| 2531 | s = sm_table[i].s;
|
---|
| 2532 | if (!s || !sm_table[i].new_section)
|
---|
| 2533 | continue;
|
---|
| 2534 | sh = &shdr[i];
|
---|
| 2535 | if (sh->sh_link > 0)
|
---|
| 2536 | s->link = sm_table[sh->sh_link].s;
|
---|
| 2537 | if (sh->sh_type == SHT_RELX) {
|
---|
| 2538 | s->sh_info = sm_table[sh->sh_info].s->sh_num;
|
---|
| 2539 | /* update backward link */
|
---|
| 2540 | s1->sections[s->sh_info]->reloc = s;
|
---|
| 2541 | }
|
---|
| 2542 | }
|
---|
| 2543 | sm = sm_table;
|
---|
| 2544 |
|
---|
| 2545 | /* resolve symbols */
|
---|
| 2546 | old_to_new_syms = tcc_mallocz(nb_syms * sizeof(int));
|
---|
| 2547 |
|
---|
| 2548 | sym = symtab + 1;
|
---|
| 2549 | for(i = 1; i < nb_syms; i++, sym++) {
|
---|
| 2550 | if (sym->st_shndx != SHN_UNDEF &&
|
---|
| 2551 | sym->st_shndx < SHN_LORESERVE) {
|
---|
| 2552 | sm = &sm_table[sym->st_shndx];
|
---|
| 2553 | if (sm->link_once) {
|
---|
| 2554 | /* if a symbol is in a link once section, we use the
|
---|
| 2555 | already defined symbol. It is very important to get
|
---|
| 2556 | correct relocations */
|
---|
| 2557 | if (ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) {
|
---|
| 2558 | name = strtab + sym->st_name;
|
---|
| 2559 | sym_index = find_elf_sym(symtab_section, name);
|
---|
| 2560 | if (sym_index)
|
---|
| 2561 | old_to_new_syms[i] = sym_index;
|
---|
| 2562 | }
|
---|
| 2563 | continue;
|
---|
| 2564 | }
|
---|
| 2565 | /* if no corresponding section added, no need to add symbol */
|
---|
| 2566 | if (!sm->s)
|
---|
| 2567 | continue;
|
---|
| 2568 | /* convert section number */
|
---|
| 2569 | sym->st_shndx = sm->s->sh_num;
|
---|
| 2570 | /* offset value */
|
---|
| 2571 | sym->st_value += sm->offset;
|
---|
| 2572 | }
|
---|
| 2573 | /* add symbol */
|
---|
| 2574 | name = strtab + sym->st_name;
|
---|
| 2575 | sym_index = add_elf_sym(symtab_section, sym->st_value, sym->st_size,
|
---|
| 2576 | sym->st_info, sym->st_other,
|
---|
| 2577 | sym->st_shndx, name);
|
---|
| 2578 | old_to_new_syms[i] = sym_index;
|
---|
| 2579 | }
|
---|
| 2580 |
|
---|
| 2581 | /* third pass to patch relocation entries */
|
---|
| 2582 | for(i = 1; i < ehdr.e_shnum; i++) {
|
---|
| 2583 | s = sm_table[i].s;
|
---|
| 2584 | if (!s)
|
---|
| 2585 | continue;
|
---|
| 2586 | sh = &shdr[i];
|
---|
| 2587 | offset = sm_table[i].offset;
|
---|
| 2588 | switch(s->sh_type) {
|
---|
| 2589 | case SHT_RELX:
|
---|
| 2590 | /* take relocation offset information */
|
---|
| 2591 | offseti = sm_table[sh->sh_info].offset;
|
---|
| 2592 | rel_end = (ElfW_Rel *)(s->data + s->data_offset);
|
---|
| 2593 | for(rel = (ElfW_Rel *)(s->data + offset);
|
---|
| 2594 | rel < rel_end;
|
---|
| 2595 | rel++) {
|
---|
| 2596 | int type;
|
---|
| 2597 | unsigned sym_index;
|
---|
| 2598 | /* convert symbol index */
|
---|
| 2599 | type = ELFW(R_TYPE)(rel->r_info);
|
---|
| 2600 | sym_index = ELFW(R_SYM)(rel->r_info);
|
---|
| 2601 | /* NOTE: only one symtab assumed */
|
---|
| 2602 | if (sym_index >= nb_syms)
|
---|
| 2603 | goto invalid_reloc;
|
---|
| 2604 | sym_index = old_to_new_syms[sym_index];
|
---|
| 2605 | /* ignore link_once in rel section. */
|
---|
| 2606 | if (!sym_index && !sm->link_once
|
---|
| 2607 | #ifdef TCC_TARGET_ARM
|
---|
| 2608 | && type != R_ARM_V4BX
|
---|
| 2609 | #endif
|
---|
| 2610 | ) {
|
---|
| 2611 | invalid_reloc:
|
---|
| 2612 | tcc_error_noabort("Invalid relocation entry [%2d] '%s' @ %.8x",
|
---|
| 2613 | i, strsec + sh->sh_name, rel->r_offset);
|
---|
| 2614 | goto fail;
|
---|
| 2615 | }
|
---|
| 2616 | rel->r_info = ELFW(R_INFO)(sym_index, type);
|
---|
| 2617 | /* offset the relocation offset */
|
---|
| 2618 | rel->r_offset += offseti;
|
---|
| 2619 | #ifdef TCC_TARGET_ARM
|
---|
| 2620 | /* Jumps and branches from a Thumb code to a PLT entry need
|
---|
| 2621 | special handling since PLT entries are ARM code.
|
---|
| 2622 | Unconditional bl instructions referencing PLT entries are
|
---|
| 2623 | handled by converting these instructions into blx
|
---|
| 2624 | instructions. Other case of instructions referencing a PLT
|
---|
| 2625 | entry require to add a Thumb stub before the PLT entry to
|
---|
| 2626 | switch to ARM mode. We set bit 0 of the got offset of a
|
---|
| 2627 | symbol to indicate such a case. */
|
---|
| 2628 | if (type == R_ARM_THM_JUMP24)
|
---|
| 2629 | alloc_sym_attr(s1, sym_index)->plt_thumb_stub = 1;
|
---|
| 2630 | #endif
|
---|
| 2631 | }
|
---|
| 2632 | break;
|
---|
| 2633 | default:
|
---|
| 2634 | break;
|
---|
| 2635 | }
|
---|
| 2636 | }
|
---|
| 2637 |
|
---|
| 2638 | ret = 0;
|
---|
| 2639 | the_end:
|
---|
| 2640 | tcc_free(symtab);
|
---|
| 2641 | tcc_free(strtab);
|
---|
| 2642 | tcc_free(old_to_new_syms);
|
---|
| 2643 | tcc_free(sm_table);
|
---|
| 2644 | tcc_free(strsec);
|
---|
| 2645 | tcc_free(shdr);
|
---|
| 2646 | return ret;
|
---|
| 2647 | }
|
---|
| 2648 |
|
---|
| 2649 | typedef struct ArchiveHeader {
|
---|
| 2650 | char ar_name[16]; /* name of this member */
|
---|
| 2651 | char ar_date[12]; /* file mtime */
|
---|
| 2652 | char ar_uid[6]; /* owner uid; printed as decimal */
|
---|
| 2653 | char ar_gid[6]; /* owner gid; printed as decimal */
|
---|
| 2654 | char ar_mode[8]; /* file mode, printed as octal */
|
---|
| 2655 | char ar_size[10]; /* file size, printed as decimal */
|
---|
| 2656 | char ar_fmag[2]; /* should contain ARFMAG */
|
---|
| 2657 | } ArchiveHeader;
|
---|
| 2658 |
|
---|
| 2659 | static int get_be32(const uint8_t *b)
|
---|
| 2660 | {
|
---|
| 2661 | return b[3] | (b[2] << 8) | (b[1] << 16) | (b[0] << 24);
|
---|
| 2662 | }
|
---|
| 2663 |
|
---|
| 2664 | /* load only the objects which resolve undefined symbols */
|
---|
| 2665 | static int tcc_load_alacarte(TCCState *s1, int fd, int size)
|
---|
| 2666 | {
|
---|
| 2667 | int i, bound, nsyms, sym_index, off, ret;
|
---|
| 2668 | uint8_t *data;
|
---|
| 2669 | const char *ar_names, *p;
|
---|
| 2670 | const uint8_t *ar_index;
|
---|
| 2671 | ElfW(Sym) *sym;
|
---|
| 2672 |
|
---|
| 2673 | data = tcc_malloc(size);
|
---|
| 2674 | if (read(fd, data, size) != size)
|
---|
| 2675 | goto fail;
|
---|
| 2676 | nsyms = get_be32(data);
|
---|
| 2677 | ar_index = data + 4;
|
---|
| 2678 | ar_names = ar_index + nsyms * 4;
|
---|
| 2679 |
|
---|
| 2680 | do {
|
---|
| 2681 | bound = 0;
|
---|
| 2682 | for(p = ar_names, i = 0; i < nsyms; i++, p += strlen(p)+1) {
|
---|
| 2683 | sym_index = find_elf_sym(symtab_section, p);
|
---|
| 2684 | if(sym_index) {
|
---|
| 2685 | sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
|
---|
| 2686 | if(sym->st_shndx == SHN_UNDEF) {
|
---|
| 2687 | off = get_be32(ar_index + i * 4) + sizeof(ArchiveHeader);
|
---|
| 2688 | #if 0
|
---|
| 2689 | printf("%5d\t%s\t%08x\n", i, p, sym->st_shndx);
|
---|
| 2690 | #endif
|
---|
| 2691 | ++bound;
|
---|
| 2692 | lseek(fd, off, SEEK_SET);
|
---|
| 2693 | if(tcc_load_object_file(s1, fd, off) < 0) {
|
---|
| 2694 | fail:
|
---|
| 2695 | ret = -1;
|
---|
| 2696 | goto the_end;
|
---|
| 2697 | }
|
---|
| 2698 | }
|
---|
| 2699 | }
|
---|
| 2700 | }
|
---|
| 2701 | } while(bound);
|
---|
| 2702 | ret = 0;
|
---|
| 2703 | the_end:
|
---|
| 2704 | tcc_free(data);
|
---|
| 2705 | return ret;
|
---|
| 2706 | }
|
---|
| 2707 |
|
---|
| 2708 | /* load a '.a' file */
|
---|
| 2709 | ST_FUNC int tcc_load_archive(TCCState *s1, int fd)
|
---|
| 2710 | {
|
---|
| 2711 | ArchiveHeader hdr;
|
---|
| 2712 | char ar_size[11];
|
---|
| 2713 | char ar_name[17];
|
---|
| 2714 | char magic[8];
|
---|
| 2715 | int size, len, i;
|
---|
| 2716 | unsigned long file_offset;
|
---|
| 2717 |
|
---|
| 2718 | /* skip magic which was already checked */
|
---|
| 2719 | read(fd, magic, sizeof(magic));
|
---|
| 2720 |
|
---|
| 2721 | for(;;) {
|
---|
| 2722 | len = read(fd, &hdr, sizeof(hdr));
|
---|
| 2723 | if (len == 0)
|
---|
| 2724 | break;
|
---|
| 2725 | if (len != sizeof(hdr)) {
|
---|
| 2726 | tcc_error_noabort("invalid archive");
|
---|
| 2727 | return -1;
|
---|
| 2728 | }
|
---|
| 2729 | memcpy(ar_size, hdr.ar_size, sizeof(hdr.ar_size));
|
---|
| 2730 | ar_size[sizeof(hdr.ar_size)] = '\0';
|
---|
| 2731 | size = strtol(ar_size, NULL, 0);
|
---|
| 2732 | memcpy(ar_name, hdr.ar_name, sizeof(hdr.ar_name));
|
---|
| 2733 | for(i = sizeof(hdr.ar_name) - 1; i >= 0; i--) {
|
---|
| 2734 | if (ar_name[i] != ' ')
|
---|
| 2735 | break;
|
---|
| 2736 | }
|
---|
| 2737 | ar_name[i + 1] = '\0';
|
---|
| 2738 | // printf("name='%s' size=%d %s\n", ar_name, size, ar_size);
|
---|
| 2739 | file_offset = lseek(fd, 0, SEEK_CUR);
|
---|
| 2740 | /* align to even */
|
---|
| 2741 | size = (size + 1) & ~1;
|
---|
| 2742 | if (!strcmp(ar_name, "/")) {
|
---|
| 2743 | /* coff symbol table : we handle it */
|
---|
| 2744 | if(s1->alacarte_link)
|
---|
| 2745 | return tcc_load_alacarte(s1, fd, size);
|
---|
| 2746 | } else if (!strcmp(ar_name, "//") ||
|
---|
| 2747 | !strcmp(ar_name, "__.SYMDEF") ||
|
---|
| 2748 | !strcmp(ar_name, "__.SYMDEF/") ||
|
---|
| 2749 | !strcmp(ar_name, "ARFILENAMES/")) {
|
---|
| 2750 | /* skip symbol table or archive names */
|
---|
| 2751 | } else {
|
---|
| 2752 | if (tcc_load_object_file(s1, fd, file_offset) < 0)
|
---|
| 2753 | return -1;
|
---|
| 2754 | }
|
---|
| 2755 | lseek(fd, file_offset + size, SEEK_SET);
|
---|
| 2756 | }
|
---|
| 2757 | return 0;
|
---|
| 2758 | }
|
---|
| 2759 |
|
---|
| 2760 | #ifndef TCC_TARGET_PE
|
---|
| 2761 | /* load a DLL and all referenced DLLs. 'level = 0' means that the DLL
|
---|
| 2762 | is referenced by the user (so it should be added as DT_NEEDED in
|
---|
| 2763 | the generated ELF file) */
|
---|
| 2764 | ST_FUNC int tcc_load_dll(TCCState *s1, int fd, const char *filename, int level)
|
---|
| 2765 | {
|
---|
| 2766 | ElfW(Ehdr) ehdr;
|
---|
| 2767 | ElfW(Shdr) *shdr, *sh, *sh1;
|
---|
| 2768 | int i, j, nb_syms, nb_dts, sym_bind, ret;
|
---|
| 2769 | ElfW(Sym) *sym, *dynsym;
|
---|
| 2770 | ElfW(Dyn) *dt, *dynamic;
|
---|
| 2771 | unsigned char *dynstr;
|
---|
| 2772 | const char *name, *soname;
|
---|
| 2773 | DLLReference *dllref;
|
---|
| 2774 |
|
---|
| 2775 | read(fd, &ehdr, sizeof(ehdr));
|
---|
| 2776 |
|
---|
| 2777 | /* test CPU specific stuff */
|
---|
| 2778 | if (ehdr.e_ident[5] != ELFDATA2LSB ||
|
---|
| 2779 | ehdr.e_machine != EM_TCC_TARGET) {
|
---|
| 2780 | tcc_error_noabort("bad architecture");
|
---|
| 2781 | return -1;
|
---|
| 2782 | }
|
---|
| 2783 |
|
---|
| 2784 | /* read sections */
|
---|
| 2785 | shdr = load_data(fd, ehdr.e_shoff, sizeof(ElfW(Shdr)) * ehdr.e_shnum);
|
---|
| 2786 |
|
---|
| 2787 | /* load dynamic section and dynamic symbols */
|
---|
| 2788 | nb_syms = 0;
|
---|
| 2789 | nb_dts = 0;
|
---|
| 2790 | dynamic = NULL;
|
---|
| 2791 | dynsym = NULL; /* avoid warning */
|
---|
| 2792 | dynstr = NULL; /* avoid warning */
|
---|
| 2793 | for(i = 0, sh = shdr; i < ehdr.e_shnum; i++, sh++) {
|
---|
| 2794 | switch(sh->sh_type) {
|
---|
| 2795 | case SHT_DYNAMIC:
|
---|
| 2796 | nb_dts = sh->sh_size / sizeof(ElfW(Dyn));
|
---|
| 2797 | dynamic = load_data(fd, sh->sh_offset, sh->sh_size);
|
---|
| 2798 | break;
|
---|
| 2799 | case SHT_DYNSYM:
|
---|
| 2800 | nb_syms = sh->sh_size / sizeof(ElfW(Sym));
|
---|
| 2801 | dynsym = load_data(fd, sh->sh_offset, sh->sh_size);
|
---|
| 2802 | sh1 = &shdr[sh->sh_link];
|
---|
| 2803 | dynstr = load_data(fd, sh1->sh_offset, sh1->sh_size);
|
---|
| 2804 | break;
|
---|
| 2805 | default:
|
---|
| 2806 | break;
|
---|
| 2807 | }
|
---|
| 2808 | }
|
---|
| 2809 |
|
---|
| 2810 | /* compute the real library name */
|
---|
| 2811 | soname = tcc_basename(filename);
|
---|
| 2812 |
|
---|
| 2813 | for(i = 0, dt = dynamic; i < nb_dts; i++, dt++) {
|
---|
| 2814 | if (dt->d_tag == DT_SONAME) {
|
---|
| 2815 | soname = dynstr + dt->d_un.d_val;
|
---|
| 2816 | }
|
---|
| 2817 | }
|
---|
| 2818 |
|
---|
| 2819 | /* if the dll is already loaded, do not load it */
|
---|
| 2820 | for(i = 0; i < s1->nb_loaded_dlls; i++) {
|
---|
| 2821 | dllref = s1->loaded_dlls[i];
|
---|
| 2822 | if (!strcmp(soname, dllref->name)) {
|
---|
| 2823 | /* but update level if needed */
|
---|
| 2824 | if (level < dllref->level)
|
---|
| 2825 | dllref->level = level;
|
---|
| 2826 | ret = 0;
|
---|
| 2827 | goto the_end;
|
---|
| 2828 | }
|
---|
| 2829 | }
|
---|
| 2830 |
|
---|
| 2831 | // printf("loading dll '%s'\n", soname);
|
---|
| 2832 |
|
---|
| 2833 | /* add the dll and its level */
|
---|
| 2834 | dllref = tcc_mallocz(sizeof(DLLReference) + strlen(soname));
|
---|
| 2835 | dllref->level = level;
|
---|
| 2836 | strcpy(dllref->name, soname);
|
---|
| 2837 | dynarray_add((void ***)&s1->loaded_dlls, &s1->nb_loaded_dlls, dllref);
|
---|
| 2838 |
|
---|
| 2839 | /* add dynamic symbols in dynsym_section */
|
---|
| 2840 | for(i = 1, sym = dynsym + 1; i < nb_syms; i++, sym++) {
|
---|
| 2841 | sym_bind = ELFW(ST_BIND)(sym->st_info);
|
---|
| 2842 | if (sym_bind == STB_LOCAL)
|
---|
| 2843 | continue;
|
---|
| 2844 | name = dynstr + sym->st_name;
|
---|
| 2845 | add_elf_sym(s1->dynsymtab_section, sym->st_value, sym->st_size,
|
---|
| 2846 | sym->st_info, sym->st_other, sym->st_shndx, name);
|
---|
| 2847 | }
|
---|
| 2848 |
|
---|
| 2849 | /* load all referenced DLLs */
|
---|
| 2850 | for(i = 0, dt = dynamic; i < nb_dts; i++, dt++) {
|
---|
| 2851 | switch(dt->d_tag) {
|
---|
| 2852 | case DT_NEEDED:
|
---|
| 2853 | name = dynstr + dt->d_un.d_val;
|
---|
| 2854 | for(j = 0; j < s1->nb_loaded_dlls; j++) {
|
---|
| 2855 | dllref = s1->loaded_dlls[j];
|
---|
| 2856 | if (!strcmp(name, dllref->name))
|
---|
| 2857 | goto already_loaded;
|
---|
| 2858 | }
|
---|
| 2859 | if (tcc_add_dll(s1, name, AFF_REFERENCED_DLL) < 0) {
|
---|
| 2860 | tcc_error_noabort("referenced dll '%s' not found", name);
|
---|
| 2861 | ret = -1;
|
---|
| 2862 | goto the_end;
|
---|
| 2863 | }
|
---|
| 2864 | already_loaded:
|
---|
| 2865 | break;
|
---|
| 2866 | }
|
---|
| 2867 | }
|
---|
| 2868 | ret = 0;
|
---|
| 2869 | the_end:
|
---|
| 2870 | tcc_free(dynstr);
|
---|
| 2871 | tcc_free(dynsym);
|
---|
| 2872 | tcc_free(dynamic);
|
---|
| 2873 | tcc_free(shdr);
|
---|
| 2874 | return ret;
|
---|
| 2875 | }
|
---|
| 2876 |
|
---|
| 2877 | #define LD_TOK_NAME 256
|
---|
| 2878 | #define LD_TOK_EOF (-1)
|
---|
| 2879 |
|
---|
| 2880 | /* return next ld script token */
|
---|
| 2881 | static int ld_next(TCCState *s1, char *name, int name_size)
|
---|
| 2882 | {
|
---|
| 2883 | int c;
|
---|
| 2884 | char *q;
|
---|
| 2885 |
|
---|
| 2886 | redo:
|
---|
| 2887 | switch(ch) {
|
---|
| 2888 | case ' ':
|
---|
| 2889 | case '\t':
|
---|
| 2890 | case '\f':
|
---|
| 2891 | case '\v':
|
---|
| 2892 | case '\r':
|
---|
| 2893 | case '\n':
|
---|
| 2894 | inp();
|
---|
| 2895 | goto redo;
|
---|
| 2896 | case '/':
|
---|
| 2897 | minp();
|
---|
| 2898 | if (ch == '*') {
|
---|
| 2899 | file->buf_ptr = parse_comment(file->buf_ptr);
|
---|
| 2900 | ch = file->buf_ptr[0];
|
---|
| 2901 | goto redo;
|
---|
| 2902 | } else {
|
---|
| 2903 | q = name;
|
---|
| 2904 | *q++ = '/';
|
---|
| 2905 | goto parse_name;
|
---|
| 2906 | }
|
---|
| 2907 | break;
|
---|
| 2908 | /* case 'a' ... 'z': */
|
---|
| 2909 | case 'a':
|
---|
| 2910 | case 'b':
|
---|
| 2911 | case 'c':
|
---|
| 2912 | case 'd':
|
---|
| 2913 | case 'e':
|
---|
| 2914 | case 'f':
|
---|
| 2915 | case 'g':
|
---|
| 2916 | case 'h':
|
---|
| 2917 | case 'i':
|
---|
| 2918 | case 'j':
|
---|
| 2919 | case 'k':
|
---|
| 2920 | case 'l':
|
---|
| 2921 | case 'm':
|
---|
| 2922 | case 'n':
|
---|
| 2923 | case 'o':
|
---|
| 2924 | case 'p':
|
---|
| 2925 | case 'q':
|
---|
| 2926 | case 'r':
|
---|
| 2927 | case 's':
|
---|
| 2928 | case 't':
|
---|
| 2929 | case 'u':
|
---|
| 2930 | case 'v':
|
---|
| 2931 | case 'w':
|
---|
| 2932 | case 'x':
|
---|
| 2933 | case 'y':
|
---|
| 2934 | case 'z':
|
---|
| 2935 | /* case 'A' ... 'z': */
|
---|
| 2936 | case 'A':
|
---|
| 2937 | case 'B':
|
---|
| 2938 | case 'C':
|
---|
| 2939 | case 'D':
|
---|
| 2940 | case 'E':
|
---|
| 2941 | case 'F':
|
---|
| 2942 | case 'G':
|
---|
| 2943 | case 'H':
|
---|
| 2944 | case 'I':
|
---|
| 2945 | case 'J':
|
---|
| 2946 | case 'K':
|
---|
| 2947 | case 'L':
|
---|
| 2948 | case 'M':
|
---|
| 2949 | case 'N':
|
---|
| 2950 | case 'O':
|
---|
| 2951 | case 'P':
|
---|
| 2952 | case 'Q':
|
---|
| 2953 | case 'R':
|
---|
| 2954 | case 'S':
|
---|
| 2955 | case 'T':
|
---|
| 2956 | case 'U':
|
---|
| 2957 | case 'V':
|
---|
| 2958 | case 'W':
|
---|
| 2959 | case 'X':
|
---|
| 2960 | case 'Y':
|
---|
| 2961 | case 'Z':
|
---|
| 2962 | case '_':
|
---|
| 2963 | case '\\':
|
---|
| 2964 | case '.':
|
---|
| 2965 | case '$':
|
---|
| 2966 | case '~':
|
---|
| 2967 | q = name;
|
---|
| 2968 | parse_name:
|
---|
| 2969 | for(;;) {
|
---|
| 2970 | if (!((ch >= 'a' && ch <= 'z') ||
|
---|
| 2971 | (ch >= 'A' && ch <= 'Z') ||
|
---|
| 2972 | (ch >= '0' && ch <= '9') ||
|
---|
| 2973 | strchr("/.-_+=$:\\,~", ch)))
|
---|
| 2974 | break;
|
---|
| 2975 | if ((q - name) < name_size - 1) {
|
---|
| 2976 | *q++ = ch;
|
---|
| 2977 | }
|
---|
| 2978 | minp();
|
---|
| 2979 | }
|
---|
| 2980 | *q = '\0';
|
---|
| 2981 | c = LD_TOK_NAME;
|
---|
| 2982 | break;
|
---|
| 2983 | case CH_EOF:
|
---|
| 2984 | c = LD_TOK_EOF;
|
---|
| 2985 | break;
|
---|
| 2986 | default:
|
---|
| 2987 | c = ch;
|
---|
| 2988 | inp();
|
---|
| 2989 | break;
|
---|
| 2990 | }
|
---|
| 2991 | #if 0
|
---|
| 2992 | printf("tok=%c %d\n", c, c);
|
---|
| 2993 | if (c == LD_TOK_NAME)
|
---|
| 2994 | printf(" name=%s\n", name);
|
---|
| 2995 | #endif
|
---|
| 2996 | return c;
|
---|
| 2997 | }
|
---|
| 2998 |
|
---|
| 2999 | static int ld_add_file(TCCState *s1, const char filename[])
|
---|
| 3000 | {
|
---|
| 3001 | int ret;
|
---|
| 3002 |
|
---|
| 3003 | ret = tcc_add_file_internal(s1, filename, 0);
|
---|
| 3004 | if (ret)
|
---|
| 3005 | ret = tcc_add_dll(s1, filename, 0);
|
---|
| 3006 | return ret;
|
---|
| 3007 | }
|
---|
| 3008 |
|
---|
| 3009 | static inline int new_undef_syms(void)
|
---|
| 3010 | {
|
---|
| 3011 | int ret = 0;
|
---|
| 3012 | ret = new_undef_sym;
|
---|
| 3013 | new_undef_sym = 0;
|
---|
| 3014 | return ret;
|
---|
| 3015 | }
|
---|
| 3016 |
|
---|
| 3017 | static int ld_add_file_list(TCCState *s1, const char *cmd, int as_needed)
|
---|
| 3018 | {
|
---|
| 3019 | char filename[1024], libname[1024];
|
---|
| 3020 | int t, group, nblibs = 0, ret = 0;
|
---|
| 3021 | char **libs = NULL;
|
---|
| 3022 |
|
---|
| 3023 | group = !strcmp(cmd, "GROUP");
|
---|
| 3024 | if (!as_needed)
|
---|
| 3025 | new_undef_syms();
|
---|
| 3026 | t = ld_next(s1, filename, sizeof(filename));
|
---|
| 3027 | if (t != '(')
|
---|
| 3028 | expect("(");
|
---|
| 3029 | t = ld_next(s1, filename, sizeof(filename));
|
---|
| 3030 | for(;;) {
|
---|
| 3031 | libname[0] = '\0';
|
---|
| 3032 | if (t == LD_TOK_EOF) {
|
---|
| 3033 | tcc_error_noabort("unexpected end of file");
|
---|
| 3034 | ret = -1;
|
---|
| 3035 | goto lib_parse_error;
|
---|
| 3036 | } else if (t == ')') {
|
---|
| 3037 | break;
|
---|
| 3038 | } else if (t == '-') {
|
---|
| 3039 | t = ld_next(s1, filename, sizeof(filename));
|
---|
| 3040 | if ((t != LD_TOK_NAME) || (filename[0] != 'l')) {
|
---|
| 3041 | tcc_error_noabort("library name expected");
|
---|
| 3042 | ret = -1;
|
---|
| 3043 | goto lib_parse_error;
|
---|
| 3044 | }
|
---|
| 3045 | pstrcpy(libname, sizeof libname, &filename[1]);
|
---|
| 3046 | if (s1->static_link) {
|
---|
| 3047 | snprintf(filename, sizeof filename, "lib%s.a", libname);
|
---|
| 3048 | } else {
|
---|
| 3049 | snprintf(filename, sizeof filename, "lib%s.so", libname);
|
---|
| 3050 | }
|
---|
| 3051 | } else if (t != LD_TOK_NAME) {
|
---|
| 3052 | tcc_error_noabort("filename expected");
|
---|
| 3053 | ret = -1;
|
---|
| 3054 | goto lib_parse_error;
|
---|
| 3055 | }
|
---|
| 3056 | if (!strcmp(filename, "AS_NEEDED")) {
|
---|
| 3057 | ret = ld_add_file_list(s1, cmd, 1);
|
---|
| 3058 | if (ret)
|
---|
| 3059 | goto lib_parse_error;
|
---|
| 3060 | } else {
|
---|
| 3061 | /* TODO: Implement AS_NEEDED support. Ignore it for now */
|
---|
| 3062 | if (!as_needed) {
|
---|
| 3063 | ret = ld_add_file(s1, filename);
|
---|
| 3064 | if (ret)
|
---|
| 3065 | goto lib_parse_error;
|
---|
| 3066 | if (group) {
|
---|
| 3067 | /* Add the filename *and* the libname to avoid future conversions */
|
---|
| 3068 | dynarray_add((void ***) &libs, &nblibs, tcc_strdup(filename));
|
---|
| 3069 | if (libname[0] != '\0')
|
---|
| 3070 | dynarray_add((void ***) &libs, &nblibs, tcc_strdup(libname));
|
---|
| 3071 | }
|
---|
| 3072 | }
|
---|
| 3073 | }
|
---|
| 3074 | t = ld_next(s1, filename, sizeof(filename));
|
---|
| 3075 | if (t == ',') {
|
---|
| 3076 | t = ld_next(s1, filename, sizeof(filename));
|
---|
| 3077 | }
|
---|
| 3078 | }
|
---|
| 3079 | if (group && !as_needed) {
|
---|
| 3080 | while (new_undef_syms()) {
|
---|
| 3081 | int i;
|
---|
| 3082 |
|
---|
| 3083 | for (i = 0; i < nblibs; i ++)
|
---|
| 3084 | ld_add_file(s1, libs[i]);
|
---|
| 3085 | }
|
---|
| 3086 | }
|
---|
| 3087 | lib_parse_error:
|
---|
| 3088 | dynarray_reset(&libs, &nblibs);
|
---|
| 3089 | return ret;
|
---|
| 3090 | }
|
---|
| 3091 |
|
---|
| 3092 | /* interpret a subset of GNU ldscripts to handle the dummy libc.so
|
---|
| 3093 | files */
|
---|
| 3094 | ST_FUNC int tcc_load_ldscript(TCCState *s1)
|
---|
| 3095 | {
|
---|
| 3096 | char cmd[64];
|
---|
| 3097 | char filename[1024];
|
---|
| 3098 | int t, ret;
|
---|
| 3099 |
|
---|
| 3100 | ch = file->buf_ptr[0];
|
---|
| 3101 | ch = handle_eob();
|
---|
| 3102 | for(;;) {
|
---|
| 3103 | t = ld_next(s1, cmd, sizeof(cmd));
|
---|
| 3104 | if (t == LD_TOK_EOF)
|
---|
| 3105 | return 0;
|
---|
| 3106 | else if (t != LD_TOK_NAME)
|
---|
| 3107 | return -1;
|
---|
| 3108 | if (!strcmp(cmd, "INPUT") ||
|
---|
| 3109 | !strcmp(cmd, "GROUP")) {
|
---|
| 3110 | ret = ld_add_file_list(s1, cmd, 0);
|
---|
| 3111 | if (ret)
|
---|
| 3112 | return ret;
|
---|
| 3113 | } else if (!strcmp(cmd, "OUTPUT_FORMAT") ||
|
---|
| 3114 | !strcmp(cmd, "TARGET")) {
|
---|
| 3115 | /* ignore some commands */
|
---|
| 3116 | t = ld_next(s1, cmd, sizeof(cmd));
|
---|
| 3117 | if (t != '(')
|
---|
| 3118 | expect("(");
|
---|
| 3119 | for(;;) {
|
---|
| 3120 | t = ld_next(s1, filename, sizeof(filename));
|
---|
| 3121 | if (t == LD_TOK_EOF) {
|
---|
| 3122 | tcc_error_noabort("unexpected end of file");
|
---|
| 3123 | return -1;
|
---|
| 3124 | } else if (t == ')') {
|
---|
| 3125 | break;
|
---|
| 3126 | }
|
---|
| 3127 | }
|
---|
| 3128 | } else {
|
---|
| 3129 | return -1;
|
---|
| 3130 | }
|
---|
| 3131 | }
|
---|
| 3132 | return 0;
|
---|
| 3133 | }
|
---|
| 3134 | #endif /* ndef TCC_TARGET_PE */
|
---|