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);
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404 | for(sym = (ElfW(Sym) *)symtab_section->data + 1;
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405 | sym < sym_end;
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406 | sym++) {
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407 | if (sym->st_shndx == SHN_COMMON) {
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408 | /* align symbol */
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409 | align = sym->st_value;
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410 | offset = bss_section->data_offset;
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411 | offset = (offset + align - 1) & -align;
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412 | sym->st_value = offset;
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413 | sym->st_shndx = bss_section->sh_num;
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414 | offset += sym->st_size;
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415 | bss_section->data_offset = offset;
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416 | }
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417 | }
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418 | }
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419 |
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420 | /* relocate symbol table, resolve undefined symbols if do_resolve is
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421 | true and output error if undefined symbol. */
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422 | ST_FUNC void relocate_syms(TCCState *s1, int do_resolve)
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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 */
|
---|