Mercurial > hg > tinycc
annotate tccelf.c @ 570:c42c2145d359
The dynamic linker location belongs in configure, move it there.
| author | Rob Landley <rob@landley.net> |
|---|---|
| date | Sat, 15 Mar 2008 21:23:24 -0500 |
| parents | d89a6822b7e0 |
| children | 6912ed120df3 |
| rev | line source |
|---|---|
| 140 | 1 /* |
| 2 * ELF file handling for TCC | |
| 3 * | |
| 331 | 4 * Copyright (c) 2001-2004 Fabrice Bellard |
| 140 | 5 * |
|
499
2b451d2e68ea
Exercise LGPL clause 3 and convert more notices from LGPL to GPLv2. (If you
Rob Landley <rob@landley.net>
parents:
481
diff
changeset
|
6 * Licensed under GPLv2, see file LICENSE in this tarball. |
| 140 | 7 */ |
| 8 | |
|
469
bb13836ab658
Patch from Vincent Pit to fix visibility problems in the linker (resulting
Rob Landley <rob@landley.net>
parents:
409
diff
changeset
|
9 #include <limits.h> |
|
bb13836ab658
Patch from Vincent Pit to fix visibility problems in the linker (resulting
Rob Landley <rob@landley.net>
parents:
409
diff
changeset
|
10 |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
11 static int put_elf_str(Section *s, char *sym) |
| 140 | 12 { |
| 13 int offset, len; | |
| 14 char *ptr; | |
| 15 | |
| 16 len = strlen(sym) + 1; | |
| 17 offset = s->data_offset; | |
| 18 ptr = section_ptr_add(s, len); | |
| 19 memcpy(ptr, sym, len); | |
| 20 return offset; | |
| 21 } | |
| 22 | |
| 23 /* elf symbol hashing function */ | |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
24 static unsigned long elf_hash(unsigned char *name) |
| 140 | 25 { |
| 26 unsigned long h = 0, g; | |
| 27 | |
| 28 while (*name) { | |
| 29 h = (h << 4) + *name++; | |
| 30 g = h & 0xf0000000; | |
| 31 if (g) | |
| 32 h ^= g >> 24; | |
| 33 h &= ~g; | |
| 34 } | |
| 35 return h; | |
| 36 } | |
| 37 | |
| 38 /* rebuild hash table of section s */ | |
| 39 /* NOTE: we do factorize the hash table code to go faster */ | |
| 40 static void rebuild_hash(Section *s, unsigned int nb_buckets) | |
| 41 { | |
| 42 Elf32_Sym *sym; | |
| 43 int *ptr, *hash, nb_syms, sym_index, h; | |
| 44 char *strtab; | |
| 45 | |
| 46 strtab = s->link->data; | |
| 47 nb_syms = s->data_offset / sizeof(Elf32_Sym); | |
| 48 | |
| 49 s->hash->data_offset = 0; | |
| 50 ptr = section_ptr_add(s->hash, (2 + nb_buckets + nb_syms) * sizeof(int)); | |
| 51 ptr[0] = nb_buckets; | |
| 52 ptr[1] = nb_syms; | |
| 53 ptr += 2; | |
| 54 hash = ptr; | |
| 55 memset(hash, 0, (nb_buckets + 1) * sizeof(int)); | |
| 56 ptr += nb_buckets + 1; | |
| 57 | |
| 58 sym = (Elf32_Sym *)s->data + 1; | |
| 59 for(sym_index = 1; sym_index < nb_syms; sym_index++) { | |
| 60 if (ELF32_ST_BIND(sym->st_info) != STB_LOCAL) { | |
| 61 h = elf_hash(strtab + sym->st_name) % nb_buckets; | |
| 62 *ptr = hash[h]; | |
| 63 hash[h] = sym_index; | |
| 64 } else { | |
| 65 *ptr = 0; | |
| 66 } | |
| 67 ptr++; | |
| 68 sym++; | |
| 69 } | |
| 70 } | |
| 71 | |
| 72 /* return the symbol number */ | |
| 73 static int put_elf_sym(Section *s, | |
| 74 unsigned long value, unsigned long size, | |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
75 int info, int other, int shndx, char *name) |
| 140 | 76 { |
| 77 int name_offset, sym_index; | |
| 78 int nbuckets, h; | |
| 79 Elf32_Sym *sym; | |
| 80 Section *hs; | |
| 81 | |
| 82 sym = section_ptr_add(s, sizeof(Elf32_Sym)); | |
| 83 if (name) | |
| 84 name_offset = put_elf_str(s->link, name); | |
| 85 else | |
| 86 name_offset = 0; | |
| 87 /* XXX: endianness */ | |
| 88 sym->st_name = name_offset; | |
| 89 sym->st_value = value; | |
| 90 sym->st_size = size; | |
| 91 sym->st_info = info; | |
| 92 sym->st_other = other; | |
| 93 sym->st_shndx = shndx; | |
| 94 sym_index = sym - (Elf32_Sym *)s->data; | |
| 95 hs = s->hash; | |
| 96 if (hs) { | |
| 97 int *ptr, *base; | |
| 98 ptr = section_ptr_add(hs, sizeof(int)); | |
| 99 base = (int *)hs->data; | |
| 100 /* only add global or weak symbols */ | |
| 101 if (ELF32_ST_BIND(info) != STB_LOCAL) { | |
| 102 /* add another hashing entry */ | |
| 103 nbuckets = base[0]; | |
| 104 h = elf_hash(name) % nbuckets; | |
| 105 *ptr = base[2 + h]; | |
| 106 base[2 + h] = sym_index; | |
| 107 base[1]++; | |
| 108 /* we resize the hash table */ | |
| 109 hs->nb_hashed_syms++; | |
| 110 if (hs->nb_hashed_syms > 2 * nbuckets) { | |
| 111 rebuild_hash(s, 2 * nbuckets); | |
| 112 } | |
| 113 } else { | |
| 114 *ptr = 0; | |
| 115 base[1]++; | |
| 116 } | |
| 117 } | |
| 118 return sym_index; | |
| 119 } | |
| 120 | |
| 121 /* find global ELF symbol 'name' and return its index. Return 0 if not | |
| 122 found. */ | |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
123 static int find_elf_sym(Section *s, char *name) |
| 140 | 124 { |
| 125 Elf32_Sym *sym; | |
| 126 Section *hs; | |
| 127 int nbuckets, sym_index, h; | |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
128 char *name1; |
| 140 | 129 |
| 130 hs = s->hash; | |
| 131 if (!hs) | |
| 132 return 0; | |
| 133 nbuckets = ((int *)hs->data)[0]; | |
| 134 h = elf_hash(name) % nbuckets; | |
| 135 sym_index = ((int *)hs->data)[2 + h]; | |
| 136 while (sym_index != 0) { | |
| 137 sym = &((Elf32_Sym *)s->data)[sym_index]; | |
| 138 name1 = s->link->data + sym->st_name; | |
| 139 if (!strcmp(name, name1)) | |
| 140 return sym_index; | |
| 141 sym_index = ((int *)hs->data)[2 + nbuckets + sym_index]; | |
| 142 } | |
| 143 return 0; | |
| 144 } | |
| 145 | |
| 146 /* return elf symbol value or error */ | |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
147 int tcc_get_symbol(TCCState *s, unsigned long *pval, char *name) |
| 140 | 148 { |
| 149 int sym_index; | |
| 150 Elf32_Sym *sym; | |
| 151 | |
| 152 sym_index = find_elf_sym(symtab_section, name); | |
| 153 if (!sym_index) | |
| 283 | 154 return -1; |
| 140 | 155 sym = &((Elf32_Sym *)symtab_section->data)[sym_index]; |
| 283 | 156 *pval = sym->st_value; |
| 157 return 0; | |
| 158 } | |
| 159 | |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
160 void *tcc_get_symbol_err(TCCState *s, char *name) |
| 283 | 161 { |
| 162 unsigned long val; | |
| 163 if (tcc_get_symbol(s, &val, name) < 0) | |
| 164 error("%s not defined", name); | |
| 165 return (void *)val; | |
| 140 | 166 } |
| 167 | |
| 168 /* add an elf symbol : check if it is already defined and patch | |
| 169 it. Return symbol index. NOTE that sh_num can be SHN_UNDEF. */ | |
| 170 static int add_elf_sym(Section *s, unsigned long value, unsigned long size, | |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
171 int info, int other, int sh_num, char *name) |
| 140 | 172 { |
| 173 Elf32_Sym *esym; | |
| 174 int sym_bind, sym_index, sym_type, esym_bind; | |
|
469
bb13836ab658
Patch from Vincent Pit to fix visibility problems in the linker (resulting
Rob Landley <rob@landley.net>
parents:
409
diff
changeset
|
175 unsigned char sym_vis, esym_vis, new_vis; |
| 140 | 176 |
| 177 sym_bind = ELF32_ST_BIND(info); | |
| 178 sym_type = ELF32_ST_TYPE(info); | |
|
469
bb13836ab658
Patch from Vincent Pit to fix visibility problems in the linker (resulting
Rob Landley <rob@landley.net>
parents:
409
diff
changeset
|
179 sym_vis = ELF32_ST_VISIBILITY(other); |
| 140 | 180 |
| 181 if (sym_bind != STB_LOCAL) { | |
| 182 /* we search global or weak symbols */ | |
| 183 sym_index = find_elf_sym(s, name); | |
| 184 if (!sym_index) | |
| 185 goto do_def; | |
| 186 esym = &((Elf32_Sym *)s->data)[sym_index]; | |
| 187 if (esym->st_shndx != SHN_UNDEF) { | |
| 188 esym_bind = ELF32_ST_BIND(esym->st_info); | |
|
469
bb13836ab658
Patch from Vincent Pit to fix visibility problems in the linker (resulting
Rob Landley <rob@landley.net>
parents:
409
diff
changeset
|
189 /* propagate the most constraining visibility */ |
|
bb13836ab658
Patch from Vincent Pit to fix visibility problems in the linker (resulting
Rob Landley <rob@landley.net>
parents:
409
diff
changeset
|
190 /* STV_DEFAULT(0)<STV_PROTECTED(3)<STV_HIDDEN(2)<STV_INTERNAL(1) */ |
|
bb13836ab658
Patch from Vincent Pit to fix visibility problems in the linker (resulting
Rob Landley <rob@landley.net>
parents:
409
diff
changeset
|
191 esym_vis = ELF32_ST_VISIBILITY(esym->st_other); |
|
bb13836ab658
Patch from Vincent Pit to fix visibility problems in the linker (resulting
Rob Landley <rob@landley.net>
parents:
409
diff
changeset
|
192 if (esym_vis == STV_DEFAULT) { |
|
bb13836ab658
Patch from Vincent Pit to fix visibility problems in the linker (resulting
Rob Landley <rob@landley.net>
parents:
409
diff
changeset
|
193 new_vis = sym_vis; |
|
bb13836ab658
Patch from Vincent Pit to fix visibility problems in the linker (resulting
Rob Landley <rob@landley.net>
parents:
409
diff
changeset
|
194 } else if (sym_vis == STV_DEFAULT) { |
|
bb13836ab658
Patch from Vincent Pit to fix visibility problems in the linker (resulting
Rob Landley <rob@landley.net>
parents:
409
diff
changeset
|
195 new_vis = esym_vis; |
|
bb13836ab658
Patch from Vincent Pit to fix visibility problems in the linker (resulting
Rob Landley <rob@landley.net>
parents:
409
diff
changeset
|
196 } else { |
|
bb13836ab658
Patch from Vincent Pit to fix visibility problems in the linker (resulting
Rob Landley <rob@landley.net>
parents:
409
diff
changeset
|
197 new_vis = (esym_vis < sym_vis) ? esym_vis : sym_vis; |
|
bb13836ab658
Patch from Vincent Pit to fix visibility problems in the linker (resulting
Rob Landley <rob@landley.net>
parents:
409
diff
changeset
|
198 } |
|
bb13836ab658
Patch from Vincent Pit to fix visibility problems in the linker (resulting
Rob Landley <rob@landley.net>
parents:
409
diff
changeset
|
199 esym->st_other = (esym->st_other & ~ELF32_ST_VISIBILITY(UCHAR_MAX)) |
|
bb13836ab658
Patch from Vincent Pit to fix visibility problems in the linker (resulting
Rob Landley <rob@landley.net>
parents:
409
diff
changeset
|
200 | new_vis; |
|
bb13836ab658
Patch from Vincent Pit to fix visibility problems in the linker (resulting
Rob Landley <rob@landley.net>
parents:
409
diff
changeset
|
201 other = esym->st_other; /* in case we have to patch esym */ |
| 140 | 202 if (sh_num == SHN_UNDEF) { |
| 203 /* ignore adding of undefined symbol if the | |
| 204 corresponding symbol is already defined */ | |
| 205 } else if (sym_bind == STB_GLOBAL && esym_bind == STB_WEAK) { | |
| 206 /* global overrides weak, so patch */ | |
| 207 goto do_patch; | |
| 208 } else if (sym_bind == STB_WEAK && esym_bind == STB_GLOBAL) { | |
| 209 /* weak is ignored if already global */ | |
|
469
bb13836ab658
Patch from Vincent Pit to fix visibility problems in the linker (resulting
Rob Landley <rob@landley.net>
parents:
409
diff
changeset
|
210 } else if (sym_vis == STV_HIDDEN || sym_vis == STV_INTERNAL) { |
|
bb13836ab658
Patch from Vincent Pit to fix visibility problems in the linker (resulting
Rob Landley <rob@landley.net>
parents:
409
diff
changeset
|
211 /* ignore hidden symbols after */ |
| 140 | 212 } else { |
| 213 #if 0 | |
| 214 printf("new_bind=%d new_shndx=%d last_bind=%d old_shndx=%d\n", | |
| 215 sym_bind, sh_num, esym_bind, esym->st_shndx); | |
| 216 #endif | |
| 217 /* NOTE: we accept that two DLL define the same symbol */ | |
| 174 | 218 if (s != tcc_state->dynsymtab_section) |
| 219 error_noabort("'%s' defined twice", name); | |
| 140 | 220 } |
| 221 } else { | |
| 222 do_patch: | |
| 223 esym->st_info = ELF32_ST_INFO(sym_bind, sym_type); | |
| 224 esym->st_shndx = sh_num; | |
| 225 esym->st_value = value; | |
| 226 esym->st_size = size; | |
| 356 | 227 esym->st_other = other; |
| 140 | 228 } |
| 229 } else { | |
| 230 do_def: | |
| 231 sym_index = put_elf_sym(s, value, size, | |
| 356 | 232 ELF32_ST_INFO(sym_bind, sym_type), other, |
| 140 | 233 sh_num, name); |
| 234 } | |
| 235 return sym_index; | |
| 236 } | |
| 237 | |
| 238 /* put relocation */ | |
| 239 static void put_elf_reloc(Section *symtab, Section *s, unsigned long offset, | |
| 240 int type, int symbol) | |
| 241 { | |
| 242 char buf[256]; | |
| 243 Section *sr; | |
| 244 Elf32_Rel *rel; | |
| 245 | |
| 246 sr = s->reloc; | |
| 247 if (!sr) { | |
| 248 /* if no relocation section, create it */ | |
| 249 snprintf(buf, sizeof(buf), ".rel%s", s->name); | |
| 250 /* if the symtab is allocated, then we consider the relocation | |
| 251 are also */ | |
| 174 | 252 sr = new_section(tcc_state, buf, SHT_REL, symtab->sh_flags); |
| 140 | 253 sr->sh_entsize = sizeof(Elf32_Rel); |
| 254 sr->link = symtab; | |
| 255 sr->sh_info = s->sh_num; | |
| 256 s->reloc = sr; | |
| 257 } | |
| 258 rel = section_ptr_add(sr, sizeof(Elf32_Rel)); | |
| 259 rel->r_offset = offset; | |
| 260 rel->r_info = ELF32_R_INFO(symbol, type); | |
| 261 } | |
| 262 | |
| 263 /* put stab debug information */ | |
| 264 | |
| 265 typedef struct { | |
| 266 unsigned long n_strx; /* index into string table of name */ | |
| 267 unsigned char n_type; /* type of symbol */ | |
| 268 unsigned char n_other; /* misc info (usually empty) */ | |
| 269 unsigned short n_desc; /* description field */ | |
| 270 unsigned long n_value; /* value of symbol */ | |
| 271 } Stab_Sym; | |
| 272 | |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
273 static void put_stabs(char *str, int type, int other, int desc, |
| 140 | 274 unsigned long value) |
| 275 { | |
| 276 Stab_Sym *sym; | |
| 277 | |
| 278 sym = section_ptr_add(stab_section, sizeof(Stab_Sym)); | |
| 279 if (str) { | |
| 280 sym->n_strx = put_elf_str(stabstr_section, str); | |
| 281 } else { | |
| 282 sym->n_strx = 0; | |
| 283 } | |
| 284 sym->n_type = type; | |
| 285 sym->n_other = other; | |
| 286 sym->n_desc = desc; | |
| 287 sym->n_value = value; | |
| 288 } | |
| 289 | |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
290 static void put_stabs_r(char *str, int type, int other, int desc, |
| 140 | 291 unsigned long value, Section *sec, int sym_index) |
| 292 { | |
| 293 put_stabs(str, type, other, desc, value); | |
| 294 put_elf_reloc(symtab_section, stab_section, | |
| 295 stab_section->data_offset - sizeof(unsigned long), | |
| 296 R_DATA_32, sym_index); | |
| 297 } | |
| 298 | |
| 299 static void put_stabn(int type, int other, int desc, int value) | |
| 300 { | |
| 301 put_stabs(NULL, type, other, desc, value); | |
| 302 } | |
| 303 | |
| 304 static void put_stabd(int type, int other, int desc) | |
| 305 { | |
| 306 put_stabs(NULL, type, other, desc, 0); | |
| 307 } | |
| 308 | |
| 309 /* In an ELF file symbol table, the local symbols must appear below | |
| 310 the global and weak ones. Since TCC cannot sort it while generating | |
| 311 the code, we must do it after. All the relocation tables are also | |
| 312 modified to take into account the symbol table sorting */ | |
| 174 | 313 static void sort_syms(TCCState *s1, Section *s) |
| 140 | 314 { |
| 315 int *old_to_new_syms; | |
| 316 Elf32_Sym *new_syms; | |
| 317 int nb_syms, i; | |
| 318 Elf32_Sym *p, *q; | |
| 319 Elf32_Rel *rel, *rel_end; | |
| 320 Section *sr; | |
| 321 int type, sym_index; | |
| 322 | |
| 323 nb_syms = s->data_offset / sizeof(Elf32_Sym); | |
|
507
67453c7d623e
Clean up malloc() and friends to xmalloc/xzmalloc/xstrdup, and remove redundant
Rob Landley <rob@landley.net>
parents:
505
diff
changeset
|
324 new_syms = xmalloc(nb_syms * sizeof(Elf32_Sym)); |
|
67453c7d623e
Clean up malloc() and friends to xmalloc/xzmalloc/xstrdup, and remove redundant
Rob Landley <rob@landley.net>
parents:
505
diff
changeset
|
325 old_to_new_syms = xmalloc(nb_syms * sizeof(int)); |
| 140 | 326 |
| 327 /* first pass for local symbols */ | |
| 328 p = (Elf32_Sym *)s->data; | |
| 329 q = new_syms; | |
| 330 for(i = 0; i < nb_syms; i++) { | |
| 331 if (ELF32_ST_BIND(p->st_info) == STB_LOCAL) { | |
| 332 old_to_new_syms[i] = q - new_syms; | |
| 333 *q++ = *p; | |
| 334 } | |
| 335 p++; | |
| 336 } | |
| 337 /* save the number of local symbols in section header */ | |
| 338 s->sh_info = q - new_syms; | |
| 339 | |
| 340 /* then second pass for non local symbols */ | |
| 341 p = (Elf32_Sym *)s->data; | |
| 342 for(i = 0; i < nb_syms; i++) { | |
| 343 if (ELF32_ST_BIND(p->st_info) != STB_LOCAL) { | |
| 344 old_to_new_syms[i] = q - new_syms; | |
| 345 *q++ = *p; | |
| 346 } | |
| 347 p++; | |
| 348 } | |
| 349 | |
| 350 /* we copy the new symbols to the old */ | |
| 351 memcpy(s->data, new_syms, nb_syms * sizeof(Elf32_Sym)); | |
|
481
0f5c38ddf450
Remove MEM_DEBUG and now-useless tcc_free() wrapper. Now, would anyone like to
Rob Landley <rob@landley.net>
parents:
479
diff
changeset
|
352 free(new_syms); |
| 140 | 353 |
| 354 /* now we modify all the relocations */ | |
| 174 | 355 for(i = 1; i < s1->nb_sections; i++) { |
| 356 sr = s1->sections[i]; | |
| 140 | 357 if (sr->sh_type == SHT_REL && sr->link == s) { |
| 358 rel_end = (Elf32_Rel *)(sr->data + sr->data_offset); | |
| 359 for(rel = (Elf32_Rel *)sr->data; | |
| 360 rel < rel_end; | |
| 361 rel++) { | |
| 362 sym_index = ELF32_R_SYM(rel->r_info); | |
| 363 type = ELF32_R_TYPE(rel->r_info); | |
| 364 sym_index = old_to_new_syms[sym_index]; | |
| 365 rel->r_info = ELF32_R_INFO(sym_index, type); | |
| 366 } | |
| 367 } | |
| 368 } | |
| 369 | |
|
481
0f5c38ddf450
Remove MEM_DEBUG and now-useless tcc_free() wrapper. Now, would anyone like to
Rob Landley <rob@landley.net>
parents:
479
diff
changeset
|
370 free(old_to_new_syms); |
| 140 | 371 } |
| 372 | |
| 373 /* relocate common symbols in the .bss section */ | |
| 374 static void relocate_common_syms(void) | |
| 375 { | |
| 376 Elf32_Sym *sym, *sym_end; | |
| 377 unsigned long offset, align; | |
| 378 | |
| 379 sym_end = (Elf32_Sym *)(symtab_section->data + symtab_section->data_offset); | |
| 380 for(sym = (Elf32_Sym *)symtab_section->data + 1; | |
| 381 sym < sym_end; | |
| 382 sym++) { | |
| 383 if (sym->st_shndx == SHN_COMMON) { | |
| 384 /* align symbol */ | |
| 385 align = sym->st_value; | |
| 386 offset = bss_section->data_offset; | |
| 387 offset = (offset + align - 1) & -align; | |
| 388 sym->st_value = offset; | |
| 389 sym->st_shndx = bss_section->sh_num; | |
| 390 offset += sym->st_size; | |
| 391 bss_section->data_offset = offset; | |
| 392 } | |
| 393 } | |
| 394 } | |
| 395 | |
| 396 /* relocate symbol table, resolve undefined symbols if do_resolve is | |
| 397 true and output error if undefined symbol. */ | |
| 174 | 398 static void relocate_syms(TCCState *s1, int do_resolve) |
| 140 | 399 { |
| 400 Elf32_Sym *sym, *esym, *sym_end; | |
| 401 int sym_bind, sh_num, sym_index; | |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
402 char *name; |
| 140 | 403 unsigned long addr; |
| 404 | |
| 405 sym_end = (Elf32_Sym *)(symtab_section->data + symtab_section->data_offset); | |
| 406 for(sym = (Elf32_Sym *)symtab_section->data + 1; | |
| 407 sym < sym_end; | |
| 408 sym++) { | |
| 409 sh_num = sym->st_shndx; | |
| 410 if (sh_num == SHN_UNDEF) { | |
| 411 name = strtab_section->data + sym->st_name; | |
| 412 if (do_resolve) { | |
| 413 name = symtab_section->link->data + sym->st_name; | |
| 350 | 414 addr = (unsigned long)resolve_sym(s1, name, ELF32_ST_TYPE(sym->st_info)); |
| 140 | 415 if (addr) { |
| 416 sym->st_value = addr; | |
| 417 goto found; | |
| 418 } | |
| 174 | 419 } else if (s1->dynsym) { |
| 140 | 420 /* if dynamic symbol exist, then use it */ |
| 174 | 421 sym_index = find_elf_sym(s1->dynsym, name); |
| 140 | 422 if (sym_index) { |
| 174 | 423 esym = &((Elf32_Sym *)s1->dynsym->data)[sym_index]; |
| 140 | 424 sym->st_value = esym->st_value; |
| 425 goto found; | |
| 426 } | |
| 427 } | |
| 428 /* XXX: _fp_hw seems to be part of the ABI, so we ignore | |
| 429 it */ | |
| 430 if (!strcmp(name, "_fp_hw")) | |
| 431 goto found; | |
| 432 /* only weak symbols are accepted to be undefined. Their | |
| 433 value is zero */ | |
| 434 sym_bind = ELF32_ST_BIND(sym->st_info); | |
| 435 if (sym_bind == STB_WEAK) { | |
| 436 sym->st_value = 0; | |
| 437 } else { | |
| 174 | 438 error_noabort("undefined symbol '%s'", name); |
| 140 | 439 } |
| 440 } else if (sh_num < SHN_LORESERVE) { | |
| 441 /* add section base */ | |
| 174 | 442 sym->st_value += s1->sections[sym->st_shndx]->sh_addr; |
| 140 | 443 } |
| 444 found: ; | |
| 445 } | |
| 446 } | |
| 447 | |
| 228 | 448 /* relocate a given section (CPU dependent) */ |
| 140 | 449 static void relocate_section(TCCState *s1, Section *s) |
| 450 { | |
| 451 Section *sr; | |
| 452 Elf32_Rel *rel, *rel_end, *qrel; | |
| 453 Elf32_Sym *sym; | |
| 342 | 454 int type, sym_index; |
| 140 | 455 unsigned char *ptr; |
| 456 unsigned long val, addr; | |
|
555
646f1f0972b6
Update TCC_TARGET_* to TINYCC_TARGET_* (which is what new build sets).
Rob Landley <rob@landley.net>
parents:
554
diff
changeset
|
457 #if defined(TINYCC_TARGET_I386) |
| 342 | 458 int esym_index; |
| 459 #endif | |
| 140 | 460 |
| 461 sr = s->reloc; | |
| 462 rel_end = (Elf32_Rel *)(sr->data + sr->data_offset); | |
| 463 qrel = (Elf32_Rel *)sr->data; | |
| 464 for(rel = qrel; | |
| 465 rel < rel_end; | |
| 466 rel++) { | |
| 467 ptr = s->data + rel->r_offset; | |
| 468 | |
| 469 sym_index = ELF32_R_SYM(rel->r_info); | |
| 470 sym = &((Elf32_Sym *)symtab_section->data)[sym_index]; | |
| 471 val = sym->st_value; | |
| 472 type = ELF32_R_TYPE(rel->r_info); | |
| 473 addr = s->sh_addr + rel->r_offset; | |
| 474 | |
| 475 /* CPU specific */ | |
| 476 switch(type) { | |
|
555
646f1f0972b6
Update TCC_TARGET_* to TINYCC_TARGET_* (which is what new build sets).
Rob Landley <rob@landley.net>
parents:
554
diff
changeset
|
477 #if defined(TINYCC_TARGET_I386) |
| 140 | 478 case R_386_32: |
|
554
8c020de0af57
Fix earlier options.c break-up by migrating some stuff from tcc.h to tinycc.h.
Rob Landley <rob@landley.net>
parents:
553
diff
changeset
|
479 if (tccg_output_type == TCC_OUTPUT_DLL) { |
| 174 | 480 esym_index = s1->symtab_to_dynsym[sym_index]; |
| 140 | 481 qrel->r_offset = rel->r_offset; |
| 482 if (esym_index) { | |
| 483 qrel->r_info = ELF32_R_INFO(esym_index, R_386_32); | |
| 484 qrel++; | |
| 485 break; | |
| 486 } else { | |
| 487 qrel->r_info = ELF32_R_INFO(0, R_386_RELATIVE); | |
| 488 qrel++; | |
| 489 } | |
| 490 } | |
| 491 *(int *)ptr += val; | |
| 492 break; | |
| 493 case R_386_PC32: | |
|
554
8c020de0af57
Fix earlier options.c break-up by migrating some stuff from tcc.h to tinycc.h.
Rob Landley <rob@landley.net>
parents:
553
diff
changeset
|
494 if (tccg_output_type == TCC_OUTPUT_DLL) { |
| 140 | 495 /* DLL relocation */ |
| 174 | 496 esym_index = s1->symtab_to_dynsym[sym_index]; |
| 140 | 497 if (esym_index) { |
| 498 qrel->r_offset = rel->r_offset; | |
| 499 qrel->r_info = ELF32_R_INFO(esym_index, R_386_PC32); | |
| 500 qrel++; | |
| 501 break; | |
| 502 } | |
| 503 } | |
| 504 *(int *)ptr += val - addr; | |
| 505 break; | |
| 506 case R_386_PLT32: | |
| 507 *(int *)ptr += val - addr; | |
| 508 break; | |
| 509 case R_386_GLOB_DAT: | |
| 510 case R_386_JMP_SLOT: | |
| 511 *(int *)ptr = val; | |
| 512 break; | |
| 513 case R_386_GOTPC: | |
| 174 | 514 *(int *)ptr += s1->got->sh_addr - addr; |
| 140 | 515 break; |
| 516 case R_386_GOTOFF: | |
| 174 | 517 *(int *)ptr += val - s1->got->sh_addr; |
| 140 | 518 break; |
| 519 case R_386_GOT32: | |
| 520 /* we load the got offset */ | |
| 174 | 521 *(int *)ptr += s1->got_offsets[sym_index]; |
| 140 | 522 break; |
|
555
646f1f0972b6
Update TCC_TARGET_* to TINYCC_TARGET_* (which is what new build sets).
Rob Landley <rob@landley.net>
parents:
554
diff
changeset
|
523 #elif defined(TINYCC_TARGET_ARM) |
| 295 | 524 case R_ARM_PC24: |
|
409
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
525 case R_ARM_CALL: |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
526 case R_ARM_JUMP24: |
| 295 | 527 case R_ARM_PLT32: |
| 528 { | |
| 529 int x; | |
| 530 x = (*(int *)ptr)&0xffffff; | |
| 531 (*(int *)ptr) &= 0xff000000; | |
| 532 if (x & 0x800000) | |
| 533 x -= 0x1000000; | |
| 534 x *= 4; | |
| 535 x += val - addr; | |
| 536 if((x & 3) != 0 || x >= 0x4000000 || x < -0x4000000) | |
| 537 error("can't relocate value at %x",addr); | |
| 538 x >>= 2; | |
| 539 x &= 0xffffff; | |
| 540 (*(int *)ptr) |= x; | |
| 541 } | |
| 542 break; | |
|
409
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
543 case R_ARM_PREL31: |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
544 { |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
545 int x; |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
546 x = (*(int *)ptr) & 0x7fffffff; |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
547 (*(int *)ptr) &= 0x80000000; |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
548 x = (x * 2) / 2; |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
549 x += val - addr; |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
550 if((x^(x>>1))&0x40000000) |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
551 error("can't relocate value at %x",addr); |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
552 (*(int *)ptr) |= x & 0x7fffffff; |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
553 } |
| 295 | 554 case R_ARM_ABS32: |
| 555 *(int *)ptr += val; | |
| 556 break; | |
|
409
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
557 case R_ARM_BASE_PREL: |
| 295 | 558 *(int *)ptr += s1->got->sh_addr - addr; |
| 559 break; | |
|
409
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
560 case R_ARM_GOTOFF32: |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
561 *(int *)ptr += val - s1->got->sh_addr; |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
562 break; |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
563 case R_ARM_GOT_BREL: |
| 295 | 564 /* we load the got offset */ |
| 565 *(int *)ptr += s1->got_offsets[sym_index]; | |
| 566 break; | |
| 567 case R_ARM_COPY: | |
| 568 break; | |
| 569 default: | |
| 570 fprintf(stderr,"FIXME: handle reloc type %x at %lx [%.8x] to %lx\n", | |
| 571 type,addr,(unsigned int )ptr,val); | |
| 572 break; | |
|
555
646f1f0972b6
Update TCC_TARGET_* to TINYCC_TARGET_* (which is what new build sets).
Rob Landley <rob@landley.net>
parents:
554
diff
changeset
|
573 #elif defined(TINYCC_TARGET_C67) |
| 305 | 574 case R_C60_32: |
| 575 *(int *)ptr += val; | |
| 576 break; | |
| 309 | 577 case R_C60LO16: |
| 578 { | |
| 579 uint32_t orig; | |
| 580 | |
| 581 /* put the low 16 bits of the absolute address */ | |
| 582 // add to what is already there | |
| 583 | |
| 584 orig = ((*(int *)(ptr )) >> 7) & 0xffff; | |
| 585 orig |= (((*(int *)(ptr+4)) >> 7) & 0xffff) << 16; | |
| 586 | |
| 587 //patch both at once - assumes always in pairs Low - High | |
| 588 | |
| 589 *(int *) ptr = (*(int *) ptr & (~(0xffff << 7)) ) | (((val+orig) & 0xffff) << 7); | |
| 590 *(int *)(ptr+4) = (*(int *)(ptr+4) & (~(0xffff << 7)) ) | ((((val+orig)>>16) & 0xffff) << 7); | |
| 591 } | |
| 592 break; | |
| 593 case R_C60HI16: | |
| 594 break; | |
| 305 | 595 default: |
| 596 fprintf(stderr,"FIXME: handle reloc type %x at %lx [%.8x] to %lx\n", | |
| 597 type,addr,(unsigned int )ptr,val); | |
| 598 break; | |
| 295 | 599 #else |
| 600 #error unsupported processor | |
| 601 #endif | |
| 140 | 602 } |
| 603 } | |
| 604 /* if the relocation is allocated, we change its symbol table */ | |
| 605 if (sr->sh_flags & SHF_ALLOC) | |
| 174 | 606 sr->link = s1->dynsym; |
| 140 | 607 } |
| 608 | |
| 609 /* relocate relocation table in 'sr' */ | |
| 174 | 610 static void relocate_rel(TCCState *s1, Section *sr) |
| 140 | 611 { |
| 612 Section *s; | |
| 613 Elf32_Rel *rel, *rel_end; | |
| 614 | |
| 174 | 615 s = s1->sections[sr->sh_info]; |
| 140 | 616 rel_end = (Elf32_Rel *)(sr->data + sr->data_offset); |
| 617 for(rel = (Elf32_Rel *)sr->data; | |
| 618 rel < rel_end; | |
| 619 rel++) { | |
| 620 rel->r_offset += s->sh_addr; | |
| 621 } | |
| 622 } | |
| 623 | |
| 624 /* count the number of dynamic relocations so that we can reserve | |
| 625 their space */ | |
| 174 | 626 static int prepare_dynamic_rel(TCCState *s1, Section *sr) |
| 140 | 627 { |
| 628 Elf32_Rel *rel, *rel_end; | |
| 629 int sym_index, esym_index, type, count; | |
| 630 | |
| 631 count = 0; | |
| 632 rel_end = (Elf32_Rel *)(sr->data + sr->data_offset); | |
| 633 for(rel = (Elf32_Rel *)sr->data; rel < rel_end; rel++) { | |
| 634 sym_index = ELF32_R_SYM(rel->r_info); | |
| 635 type = ELF32_R_TYPE(rel->r_info); | |
| 636 switch(type) { | |
| 637 case R_386_32: | |
| 638 count++; | |
| 639 break; | |
| 640 case R_386_PC32: | |
| 174 | 641 esym_index = s1->symtab_to_dynsym[sym_index]; |
| 140 | 642 if (esym_index) |
| 643 count++; | |
| 644 break; | |
| 645 default: | |
| 646 break; | |
| 647 } | |
| 648 } | |
| 649 if (count) { | |
| 650 /* allocate the section */ | |
| 651 sr->sh_flags |= SHF_ALLOC; | |
| 652 sr->sh_size = count * sizeof(Elf32_Rel); | |
| 653 } | |
| 654 return count; | |
| 655 } | |
| 656 | |
| 174 | 657 static void put_got_offset(TCCState *s1, int index, unsigned long val) |
| 140 | 658 { |
| 659 int n; | |
| 660 unsigned long *tab; | |
| 661 | |
| 174 | 662 if (index >= s1->nb_got_offsets) { |
| 140 | 663 /* find immediately bigger power of 2 and reallocate array */ |
| 664 n = 1; | |
| 665 while (index >= n) | |
| 666 n *= 2; | |
|
507
67453c7d623e
Clean up malloc() and friends to xmalloc/xzmalloc/xstrdup, and remove redundant
Rob Landley <rob@landley.net>
parents:
505
diff
changeset
|
667 tab = xrealloc(s1->got_offsets, n * sizeof(unsigned long)); |
| 174 | 668 s1->got_offsets = tab; |
| 669 memset(s1->got_offsets + s1->nb_got_offsets, 0, | |
| 670 (n - s1->nb_got_offsets) * sizeof(unsigned long)); | |
| 671 s1->nb_got_offsets = n; | |
| 140 | 672 } |
| 174 | 673 s1->got_offsets[index] = val; |
| 140 | 674 } |
| 675 | |
| 676 /* XXX: suppress that */ | |
| 228 | 677 static void put32(unsigned char *p, uint32_t val) |
| 140 | 678 { |
| 679 p[0] = val; | |
| 680 p[1] = val >> 8; | |
| 681 p[2] = val >> 16; | |
| 682 p[3] = val >> 24; | |
| 683 } | |
| 684 | |
|
555
646f1f0972b6
Update TCC_TARGET_* to TINYCC_TARGET_* (which is what new build sets).
Rob Landley <rob@landley.net>
parents:
554
diff
changeset
|
685 #if defined(TINYCC_TARGET_I386) || defined(TINYCC_TARGET_ARM) |
| 228 | 686 static uint32_t get32(unsigned char *p) |
| 687 { | |
| 688 return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24); | |
| 689 } | |
| 342 | 690 #endif |
| 228 | 691 |
| 174 | 692 static void build_got(TCCState *s1) |
| 140 | 693 { |
| 694 unsigned char *ptr; | |
| 695 | |
| 696 /* if no got, then create it */ | |
| 174 | 697 s1->got = new_section(s1, ".got", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE); |
| 698 s1->got->sh_entsize = 4; | |
| 140 | 699 add_elf_sym(symtab_section, 0, 4, ELF32_ST_INFO(STB_GLOBAL, STT_OBJECT), |
| 356 | 700 0, s1->got->sh_num, "_GLOBAL_OFFSET_TABLE_"); |
| 174 | 701 ptr = section_ptr_add(s1->got, 3 * sizeof(int)); |
| 140 | 702 /* keep space for _DYNAMIC pointer, if present */ |
| 703 put32(ptr, 0); | |
| 704 /* two dummy got entries */ | |
| 705 put32(ptr + 4, 0); | |
| 706 put32(ptr + 8, 0); | |
| 707 } | |
| 708 | |
| 709 /* put a got entry corresponding to a symbol in symtab_section. 'size' | |
| 710 and 'info' can be modifed if more precise info comes from the DLL */ | |
| 174 | 711 static void put_got_entry(TCCState *s1, |
| 712 int reloc_type, unsigned long size, int info, | |
| 140 | 713 int sym_index) |
| 714 { | |
| 715 int index; | |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
716 char *name; |
| 140 | 717 Elf32_Sym *sym; |
| 718 unsigned long offset; | |
| 719 int *ptr; | |
| 720 | |
| 174 | 721 if (!s1->got) |
| 722 build_got(s1); | |
| 140 | 723 |
| 724 /* if a got entry already exists for that symbol, no need to add one */ | |
| 174 | 725 if (sym_index < s1->nb_got_offsets && |
| 726 s1->got_offsets[sym_index] != 0) | |
| 140 | 727 return; |
| 728 | |
| 174 | 729 put_got_offset(s1, sym_index, s1->got->data_offset); |
| 140 | 730 |
| 174 | 731 if (s1->dynsym) { |
| 140 | 732 sym = &((Elf32_Sym *)symtab_section->data)[sym_index]; |
| 733 name = symtab_section->link->data + sym->st_name; | |
| 734 offset = sym->st_value; | |
|
555
646f1f0972b6
Update TCC_TARGET_* to TINYCC_TARGET_* (which is what new build sets).
Rob Landley <rob@landley.net>
parents:
554
diff
changeset
|
735 #ifdef TINYCC_TARGET_I386 |
| 140 | 736 if (reloc_type == R_386_JMP_SLOT) { |
| 228 | 737 Section *plt; |
| 738 uint8_t *p; | |
| 739 int modrm; | |
| 740 | |
| 741 /* if we build a DLL, we add a %ebx offset */ | |
|
554
8c020de0af57
Fix earlier options.c break-up by migrating some stuff from tcc.h to tinycc.h.
Rob Landley <rob@landley.net>
parents:
553
diff
changeset
|
742 if (tccg_output_type == TCC_OUTPUT_DLL) |
| 228 | 743 modrm = 0xa3; |
| 744 else | |
| 745 modrm = 0x25; | |
| 746 | |
| 747 /* add a PLT entry */ | |
| 748 plt = s1->plt; | |
| 749 if (plt->data_offset == 0) { | |
| 750 /* first plt entry */ | |
| 751 p = section_ptr_add(plt, 16); | |
| 752 p[0] = 0xff; /* pushl got + 4 */ | |
| 753 p[1] = modrm + 0x10; | |
| 754 put32(p + 2, 4); | |
| 755 p[6] = 0xff; /* jmp *(got + 8) */ | |
| 756 p[7] = modrm; | |
| 757 put32(p + 8, 8); | |
| 758 } | |
| 759 | |
| 760 p = section_ptr_add(plt, 16); | |
| 761 p[0] = 0xff; /* jmp *(got + x) */ | |
| 762 p[1] = modrm; | |
| 763 put32(p + 2, s1->got->data_offset); | |
| 764 p[6] = 0x68; /* push $xxx */ | |
| 765 put32(p + 7, (plt->data_offset - 32) >> 1); | |
| 766 p[11] = 0xe9; /* jmp plt_start */ | |
| 767 put32(p + 12, -(plt->data_offset)); | |
| 768 | |
| 769 /* the symbol is modified so that it will be relocated to | |
| 770 the PLT */ | |
|
554
8c020de0af57
Fix earlier options.c break-up by migrating some stuff from tcc.h to tinycc.h.
Rob Landley <rob@landley.net>
parents:
553
diff
changeset
|
771 if (tccg_output_type == TCC_OUTPUT_EXE) |
| 228 | 772 offset = plt->data_offset - 16; |
| 140 | 773 } |
|
555
646f1f0972b6
Update TCC_TARGET_* to TINYCC_TARGET_* (which is what new build sets).
Rob Landley <rob@landley.net>
parents:
554
diff
changeset
|
774 #elif defined(TINYCC_TARGET_ARM) |
| 295 | 775 if (reloc_type == R_ARM_JUMP_SLOT) { |
| 776 Section *plt; | |
| 777 uint8_t *p; | |
| 778 | |
| 779 /* if we build a DLL, we add a %ebx offset */ | |
|
554
8c020de0af57
Fix earlier options.c break-up by migrating some stuff from tcc.h to tinycc.h.
Rob Landley <rob@landley.net>
parents:
553
diff
changeset
|
780 if (tccg_output_type == TCC_OUTPUT_DLL) |
| 295 | 781 error("DLLs unimplemented!"); |
| 782 | |
| 783 /* add a PLT entry */ | |
| 784 plt = s1->plt; | |
| 785 if (plt->data_offset == 0) { | |
| 786 /* first plt entry */ | |
| 787 p = section_ptr_add(plt, 16); | |
| 788 put32(p , 0xe52de004); | |
| 789 put32(p + 4, 0xe59fe010); | |
| 790 put32(p + 8, 0xe08fe00e); | |
| 791 put32(p + 12, 0xe5bef008); | |
| 792 } | |
| 793 | |
| 794 p = section_ptr_add(plt, 16); | |
| 795 put32(p , 0xe59fc004); | |
| 796 put32(p+4, 0xe08fc00c); | |
| 797 put32(p+8, 0xe59cf000); | |
| 798 put32(p+12, s1->got->data_offset); | |
| 799 | |
| 800 /* the symbol is modified so that it will be relocated to | |
| 801 the PLT */ | |
|
554
8c020de0af57
Fix earlier options.c break-up by migrating some stuff from tcc.h to tinycc.h.
Rob Landley <rob@landley.net>
parents:
553
diff
changeset
|
802 if (tccg_output_type == TCC_OUTPUT_EXE) |
| 295 | 803 offset = plt->data_offset - 16; |
| 804 } | |
|
555
646f1f0972b6
Update TCC_TARGET_* to TINYCC_TARGET_* (which is what new build sets).
Rob Landley <rob@landley.net>
parents:
554
diff
changeset
|
805 #elif defined(TINYCC_TARGET_C67) |
| 305 | 806 error("C67 got not implemented"); |
| 295 | 807 #else |
| 808 #error unsupported CPU | |
| 809 #endif | |
| 174 | 810 index = put_elf_sym(s1->dynsym, offset, |
| 140 | 811 size, info, 0, sym->st_shndx, name); |
| 812 /* put a got entry */ | |
| 174 | 813 put_elf_reloc(s1->dynsym, s1->got, |
| 814 s1->got->data_offset, | |
| 140 | 815 reloc_type, index); |
| 816 } | |
| 174 | 817 ptr = section_ptr_add(s1->got, sizeof(int)); |
| 140 | 818 *ptr = 0; |
| 819 } | |
| 820 | |
| 821 /* build GOT and PLT entries */ | |
| 174 | 822 static void build_got_entries(TCCState *s1) |
| 140 | 823 { |
| 824 Section *s, *symtab; | |
| 825 Elf32_Rel *rel, *rel_end; | |
| 826 Elf32_Sym *sym; | |
| 827 int i, type, reloc_type, sym_index; | |
| 828 | |
| 174 | 829 for(i = 1; i < s1->nb_sections; i++) { |
| 830 s = s1->sections[i]; | |
| 140 | 831 if (s->sh_type != SHT_REL) |
| 832 continue; | |
| 833 /* no need to handle got relocations */ | |
| 834 if (s->link != symtab_section) | |
| 835 continue; | |
| 836 symtab = s->link; | |
| 837 rel_end = (Elf32_Rel *)(s->data + s->data_offset); | |
| 838 for(rel = (Elf32_Rel *)s->data; | |
| 839 rel < rel_end; | |
| 840 rel++) { | |
| 841 type = ELF32_R_TYPE(rel->r_info); | |
| 842 switch(type) { | |
|
555
646f1f0972b6
Update TCC_TARGET_* to TINYCC_TARGET_* (which is what new build sets).
Rob Landley <rob@landley.net>
parents:
554
diff
changeset
|
843 #if defined(TINYCC_TARGET_I386) |
| 140 | 844 case R_386_GOT32: |
| 845 case R_386_GOTOFF: | |
| 846 case R_386_GOTPC: | |
| 847 case R_386_PLT32: | |
| 174 | 848 if (!s1->got) |
| 849 build_got(s1); | |
| 140 | 850 if (type == R_386_GOT32 || type == R_386_PLT32) { |
| 851 sym_index = ELF32_R_SYM(rel->r_info); | |
| 852 sym = &((Elf32_Sym *)symtab_section->data)[sym_index]; | |
| 853 /* look at the symbol got offset. If none, then add one */ | |
| 854 if (type == R_386_GOT32) | |
| 855 reloc_type = R_386_GLOB_DAT; | |
| 856 else | |
| 857 reloc_type = R_386_JMP_SLOT; | |
| 174 | 858 put_got_entry(s1, reloc_type, sym->st_size, sym->st_info, |
| 140 | 859 sym_index); |
| 860 } | |
| 861 break; | |
|
555
646f1f0972b6
Update TCC_TARGET_* to TINYCC_TARGET_* (which is what new build sets).
Rob Landley <rob@landley.net>
parents:
554
diff
changeset
|
862 #elif defined(TINYCC_TARGET_ARM) |
|
409
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
863 case R_ARM_GOT_BREL: |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
864 case R_ARM_GOTOFF32: |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
865 case R_ARM_BASE_PREL: |
| 295 | 866 case R_ARM_PLT32: |
| 867 if (!s1->got) | |
| 868 build_got(s1); | |
|
409
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
869 if (type == R_ARM_GOT_BREL || type == R_ARM_PLT32) { |
| 295 | 870 sym_index = ELF32_R_SYM(rel->r_info); |
| 871 sym = &((Elf32_Sym *)symtab_section->data)[sym_index]; | |
| 872 /* look at the symbol got offset. If none, then add one */ | |
|
409
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
873 if (type == R_ARM_GOT_BREL) |
| 295 | 874 reloc_type = R_ARM_GLOB_DAT; |
| 875 else | |
| 876 reloc_type = R_ARM_JUMP_SLOT; | |
| 877 put_got_entry(s1, reloc_type, sym->st_size, sym->st_info, | |
| 878 sym_index); | |
| 879 } | |
| 880 break; | |
|
555
646f1f0972b6
Update TCC_TARGET_* to TINYCC_TARGET_* (which is what new build sets).
Rob Landley <rob@landley.net>
parents:
554
diff
changeset
|
881 #elif defined(TINYCC_TARGET_C67) |
| 305 | 882 case R_C60_GOT32: |
| 883 case R_C60_GOTOFF: | |
| 884 case R_C60_GOTPC: | |
| 885 case R_C60_PLT32: | |
| 886 if (!s1->got) | |
| 887 build_got(s1); | |
| 888 if (type == R_C60_GOT32 || type == R_C60_PLT32) { | |
| 889 sym_index = ELF32_R_SYM(rel->r_info); | |
| 890 sym = &((Elf32_Sym *)symtab_section->data)[sym_index]; | |
| 891 /* look at the symbol got offset. If none, then add one */ | |
| 892 if (type == R_C60_GOT32) | |
| 893 reloc_type = R_C60_GLOB_DAT; | |
| 894 else | |
| 895 reloc_type = R_C60_JMP_SLOT; | |
| 896 put_got_entry(s1, reloc_type, sym->st_size, sym->st_info, | |
| 897 sym_index); | |
| 898 } | |
| 899 break; | |
| 295 | 900 #else |
| 901 #error unsupported CPU | |
| 902 #endif | |
| 140 | 903 default: |
| 904 break; | |
| 905 } | |
| 906 } | |
| 907 } | |
| 908 } | |
| 909 | |
| 174 | 910 static Section *new_symtab(TCCState *s1, |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
911 char *symtab_name, int sh_type, int sh_flags, |
|
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
912 char *strtab_name, |
|
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
913 char *hash_name, int hash_sh_flags) |
| 140 | 914 { |
| 915 Section *symtab, *strtab, *hash; | |
| 916 int *ptr, nb_buckets; | |
| 917 | |
| 174 | 918 symtab = new_section(s1, symtab_name, sh_type, sh_flags); |
| 140 | 919 symtab->sh_entsize = sizeof(Elf32_Sym); |
| 174 | 920 strtab = new_section(s1, strtab_name, SHT_STRTAB, sh_flags); |
| 140 | 921 put_elf_str(strtab, ""); |
| 922 symtab->link = strtab; | |
| 923 put_elf_sym(symtab, 0, 0, 0, 0, 0, NULL); | |
| 924 | |
| 925 nb_buckets = 1; | |
| 926 | |
| 174 | 927 hash = new_section(s1, hash_name, SHT_HASH, hash_sh_flags); |
| 140 | 928 hash->sh_entsize = sizeof(int); |
| 929 symtab->hash = hash; | |
| 930 hash->link = symtab; | |
| 931 | |
| 932 ptr = section_ptr_add(hash, (2 + nb_buckets + 1) * sizeof(int)); | |
| 933 ptr[0] = nb_buckets; | |
| 934 ptr[1] = 1; | |
| 935 memset(ptr + 2, 0, (nb_buckets + 1) * sizeof(int)); | |
| 936 return symtab; | |
| 937 } | |
| 938 | |
| 939 /* put dynamic tag */ | |
| 940 static void put_dt(Section *dynamic, int dt, unsigned long val) | |
| 941 { | |
| 942 Elf32_Dyn *dyn; | |
| 943 dyn = section_ptr_add(dynamic, sizeof(Elf32_Dyn)); | |
| 944 dyn->d_tag = dt; | |
| 945 dyn->d_un.d_val = val; | |
| 946 } | |
| 947 | |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
948 static void add_init_array_defines(TCCState *s1, char *section_name) |
| 278 | 949 { |
| 950 Section *s; | |
| 951 long end_offset; | |
| 952 char sym_start[1024]; | |
| 953 char sym_end[1024]; | |
| 954 | |
| 955 snprintf(sym_start, sizeof(sym_start), "__%s_start", section_name + 1); | |
| 956 snprintf(sym_end, sizeof(sym_end), "__%s_end", section_name + 1); | |
| 957 | |
| 958 s = find_section(s1, section_name); | |
| 959 if (!s) { | |
| 960 end_offset = 0; | |
| 961 s = data_section; | |
| 962 } else { | |
| 963 end_offset = s->data_offset; | |
| 964 } | |
| 965 | |
| 966 add_elf_sym(symtab_section, | |
| 967 0, 0, | |
| 356 | 968 ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE), 0, |
| 278 | 969 s->sh_num, sym_start); |
| 970 add_elf_sym(symtab_section, | |
| 971 end_offset, 0, | |
| 356 | 972 ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE), 0, |
| 278 | 973 s->sh_num, sym_end); |
| 974 } | |
| 975 | |
| 140 | 976 /* add tcc runtime libraries */ |
| 977 static void tcc_add_runtime(TCCState *s1) | |
| 978 { | |
| 979 char buf[1024]; | |
| 980 | |
| 981 #ifdef CONFIG_TCC_BCHECK | |
| 982 if (do_bounds_check) { | |
| 983 unsigned long *ptr; | |
| 984 Section *init_section; | |
| 985 unsigned char *pinit; | |
| 986 int sym_index; | |
| 987 | |
| 988 /* XXX: add an object file to do that */ | |
| 989 ptr = section_ptr_add(bounds_section, sizeof(unsigned long)); | |
| 990 *ptr = 0; | |
| 991 add_elf_sym(symtab_section, 0, 0, | |
| 356 | 992 ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE), 0, |
| 140 | 993 bounds_section->sh_num, "__bounds_start"); |
| 994 /* add bound check code */ | |
|
522
a6abef04cb53
Fix path logic so "hello world" builds again. (Still need to finish install.)
Rob Landley <rob@landley.net>
parents:
519
diff
changeset
|
995 snprintf(buf, sizeof(buf), "%s/bcheck.o", tinycc_path); |
| 140 | 996 tcc_add_file(s1, buf); |
|
555
646f1f0972b6
Update TCC_TARGET_* to TINYCC_TARGET_* (which is what new build sets).
Rob Landley <rob@landley.net>
parents:
554
diff
changeset
|
997 #ifdef TINYCC_TARGET_I386 |
|
554
8c020de0af57
Fix earlier options.c break-up by migrating some stuff from tcc.h to tinycc.h.
Rob Landley <rob@landley.net>
parents:
553
diff
changeset
|
998 if (tccg_output_type != TCC_OUTPUT_MEMORY) { |
| 140 | 999 /* add 'call __bound_init()' in .init section */ |
| 174 | 1000 init_section = find_section(s1, ".init"); |
| 140 | 1001 pinit = section_ptr_add(init_section, 5); |
| 1002 pinit[0] = 0xe8; | |
| 1003 put32(pinit + 1, -4); | |
| 1004 sym_index = find_elf_sym(symtab_section, "__bound_init"); | |
| 1005 put_elf_reloc(symtab_section, init_section, | |
| 1006 init_section->data_offset - 4, R_386_PC32, sym_index); | |
| 1007 } | |
| 1008 #endif | |
| 1009 } | |
| 1010 #endif | |
|
511
374af493d0ac
More work on the library paths so we can override enough things to build
Rob Landley <rob@landley.net>
parents:
507
diff
changeset
|
1011 // add libc |
|
554
8c020de0af57
Fix earlier options.c break-up by migrating some stuff from tcc.h to tinycc.h.
Rob Landley <rob@landley.net>
parents:
553
diff
changeset
|
1012 if (!tccg_nostdlib) { |
| 289 | 1013 tcc_add_library(s1, "c"); |
|
547
9778e985b450
Rename runtime library to libtinyccrt-$ARCH.a, build libtinycc-$ARCH.so to
Rob Landley <rob@landley.net>
parents:
529
diff
changeset
|
1014 tcc_add_library(s1, "tinyccrt-" TINYCC_TARGET); |
|
511
374af493d0ac
More work on the library paths so we can override enough things to build
Rob Landley <rob@landley.net>
parents:
507
diff
changeset
|
1015 // add crt end if not memory output |
|
554
8c020de0af57
Fix earlier options.c break-up by migrating some stuff from tcc.h to tinycc.h.
Rob Landley <rob@landley.net>
parents:
553
diff
changeset
|
1016 if (tccg_output_type != TCC_OUTPUT_MEMORY) |
|
564
d89a6822b7e0
Use library search path for crt?.o, and for ld script libraries with no path.
Rob Landley <rob@landley.net>
parents:
555
diff
changeset
|
1017 tcc_add_dll(s1, "crtn.o", AFF_PRINT_ERROR); |
| 140 | 1018 } |
| 325 | 1019 } |
| 1020 | |
| 1021 /* add various standard linker symbols (must be done after the | |
| 1022 sections are filled (for example after allocating common | |
| 1023 symbols)) */ | |
| 1024 static void tcc_add_linker_symbols(TCCState *s1) | |
| 1025 { | |
| 1026 char buf[1024]; | |
| 1027 int i; | |
| 1028 Section *s; | |
| 1029 | |
| 140 | 1030 add_elf_sym(symtab_section, |
| 1031 text_section->data_offset, 0, | |
| 356 | 1032 ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE), 0, |
| 140 | 1033 text_section->sh_num, "_etext"); |
| 1034 add_elf_sym(symtab_section, | |
| 1035 data_section->data_offset, 0, | |
| 356 | 1036 ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE), 0, |
| 140 | 1037 data_section->sh_num, "_edata"); |
| 1038 add_elf_sym(symtab_section, | |
| 1039 bss_section->data_offset, 0, | |
| 356 | 1040 ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE), 0, |
| 140 | 1041 bss_section->sh_num, "_end"); |
| 278 | 1042 /* horrible new standard ldscript defines */ |
| 1043 add_init_array_defines(s1, ".preinit_array"); | |
| 1044 add_init_array_defines(s1, ".init_array"); | |
| 1045 add_init_array_defines(s1, ".fini_array"); | |
| 1046 | |
| 140 | 1047 /* add start and stop symbols for sections whose name can be |
| 1048 expressed in C */ | |
| 174 | 1049 for(i = 1; i < s1->nb_sections; i++) { |
| 1050 s = s1->sections[i]; | |
| 140 | 1051 if (s->sh_type == SHT_PROGBITS && |
| 1052 (s->sh_flags & SHF_ALLOC)) { | |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
1053 char *p; |
| 140 | 1054 int ch; |
| 1055 | |
| 1056 /* check if section name can be expressed in C */ | |
| 1057 p = s->name; | |
| 1058 for(;;) { | |
| 1059 ch = *p; | |
| 1060 if (!ch) | |
| 1061 break; | |
|
505
9311fc3f8e39
Every use of isid() can be replaced by isidnum_table[], so do it.
Rob Landley <rob@landley.net>
parents:
503
diff
changeset
|
1062 if (!isidnum_table[ch]) |
| 140 | 1063 goto next_sec; |
| 1064 p++; | |
| 1065 } | |
| 1066 snprintf(buf, sizeof(buf), "__start_%s", s->name); | |
| 1067 add_elf_sym(symtab_section, | |
| 1068 0, 0, | |
| 356 | 1069 ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE), 0, |
| 140 | 1070 s->sh_num, buf); |
| 1071 snprintf(buf, sizeof(buf), "__stop_%s", s->name); | |
| 1072 add_elf_sym(symtab_section, | |
| 1073 s->data_offset, 0, | |
| 356 | 1074 ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE), 0, |
| 140 | 1075 s->sh_num, buf); |
| 1076 } | |
| 1077 next_sec: ; | |
| 1078 } | |
| 1079 } | |
| 1080 | |
| 1081 /* name of ELF interpreter */ | |
|
570
c42c2145d359
The dynamic linker location belongs in configure, move it there.
Rob Landley <rob@landley.net>
parents:
564
diff
changeset
|
1082 static char elf_interp[] = CC_DYNAMIC_LINKER; |
| 140 | 1083 |
| 325 | 1084 static void tcc_output_binary(TCCState *s1, FILE *f, |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
1085 int *section_order) |
| 325 | 1086 { |
| 1087 Section *s; | |
| 1088 int i, offset, size; | |
| 1089 | |
| 1090 offset = 0; | |
| 1091 for(i=1;i<s1->nb_sections;i++) { | |
| 1092 s = s1->sections[section_order[i]]; | |
| 1093 if (s->sh_type != SHT_NOBITS && | |
| 1094 (s->sh_flags & SHF_ALLOC)) { | |
| 1095 while (offset < s->sh_offset) { | |
| 1096 fputc(0, f); | |
| 1097 offset++; | |
| 1098 } | |
| 1099 size = s->sh_size; | |
| 1100 fwrite(s->data, 1, size, f); | |
| 1101 offset += size; | |
| 1102 } | |
| 1103 } | |
| 1104 } | |
| 1105 | |
| 140 | 1106 /* output an ELF file */ |
| 1107 /* XXX: suppress unneeded sections */ | |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
1108 int tcc_output_file(TCCState *s1, char *filename) |
| 140 | 1109 { |
| 1110 Elf32_Ehdr ehdr; | |
| 1111 FILE *f; | |
| 174 | 1112 int fd, mode, ret; |
| 140 | 1113 int *section_order; |
| 1114 int shnum, i, phnum, file_offset, offset, size, j, tmp, sh_order_index, k; | |
| 1115 unsigned long addr; | |
| 1116 Section *strsec, *s; | |
| 1117 Elf32_Shdr shdr, *sh; | |
| 1118 Elf32_Phdr *phdr, *ph; | |
| 228 | 1119 Section *interp, *dynamic, *dynstr; |
| 140 | 1120 unsigned long saved_dynamic_data_offset; |
| 1121 Elf32_Sym *sym; | |
| 1122 int type, file_type; | |
| 1123 unsigned long rel_addr, rel_size; | |
| 1124 | |
|
554
8c020de0af57
Fix earlier options.c break-up by migrating some stuff from tcc.h to tinycc.h.
Rob Landley <rob@landley.net>
parents:
553
diff
changeset
|
1125 file_type = tccg_output_type; |
| 174 | 1126 s1->nb_errors = 0; |
| 140 | 1127 |
| 319 | 1128 if (file_type != TCC_OUTPUT_OBJ) { |
| 140 | 1129 tcc_add_runtime(s1); |
| 319 | 1130 } |
| 140 | 1131 |
| 174 | 1132 phdr = NULL; |
| 1133 section_order = NULL; | |
| 140 | 1134 interp = NULL; |
| 1135 dynamic = NULL; | |
| 1136 dynstr = NULL; /* avoid warning */ | |
| 1137 saved_dynamic_data_offset = 0; /* avoid warning */ | |
| 174 | 1138 |
| 140 | 1139 if (file_type != TCC_OUTPUT_OBJ) { |
| 325 | 1140 relocate_common_syms(); |
| 1141 | |
| 1142 tcc_add_linker_symbols(s1); | |
| 140 | 1143 |
|
554
8c020de0af57
Fix earlier options.c break-up by migrating some stuff from tcc.h to tinycc.h.
Rob Landley <rob@landley.net>
parents:
553
diff
changeset
|
1144 if (!tccg_static_link) { |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
1145 char *name; |
| 140 | 1146 int sym_index, index; |
| 1147 Elf32_Sym *esym, *sym_end; | |
| 1148 | |
| 1149 if (file_type == TCC_OUTPUT_EXE) { | |
| 1150 char *ptr; | |
| 1151 /* add interpreter section only if executable */ | |
| 174 | 1152 interp = new_section(s1, ".interp", SHT_PROGBITS, SHF_ALLOC); |
| 140 | 1153 interp->sh_addralign = 1; |
| 1154 ptr = section_ptr_add(interp, sizeof(elf_interp)); | |
| 1155 strcpy(ptr, elf_interp); | |
| 1156 } | |
| 1157 | |
| 1158 /* add dynamic symbol table */ | |
| 174 | 1159 s1->dynsym = new_symtab(s1, ".dynsym", SHT_DYNSYM, SHF_ALLOC, |
| 1160 ".dynstr", | |
| 1161 ".hash", SHF_ALLOC); | |
| 1162 dynstr = s1->dynsym->link; | |
| 140 | 1163 |
| 1164 /* add dynamic section */ | |
| 174 | 1165 dynamic = new_section(s1, ".dynamic", SHT_DYNAMIC, |
| 140 | 1166 SHF_ALLOC | SHF_WRITE); |
| 1167 dynamic->link = dynstr; | |
| 1168 dynamic->sh_entsize = sizeof(Elf32_Dyn); | |
| 1169 | |
| 1170 /* add PLT */ | |
| 228 | 1171 s1->plt = new_section(s1, ".plt", SHT_PROGBITS, |
| 1172 SHF_ALLOC | SHF_EXECINSTR); | |
| 1173 s1->plt->sh_entsize = 4; | |
| 140 | 1174 |
| 174 | 1175 build_got(s1); |
| 140 | 1176 |
| 1177 /* scan for undefined symbols and see if they are in the | |
| 1178 dynamic symbols. If a symbol STT_FUNC is found, then we | |
| 1179 add it in the PLT. If a symbol STT_OBJECT is found, we | |
| 1180 add it in the .bss section with a suitable relocation */ | |
| 1181 sym_end = (Elf32_Sym *)(symtab_section->data + | |
| 1182 symtab_section->data_offset); | |
| 1183 if (file_type == TCC_OUTPUT_EXE) { | |
| 1184 for(sym = (Elf32_Sym *)symtab_section->data + 1; | |
| 1185 sym < sym_end; | |
| 1186 sym++) { | |
| 1187 if (sym->st_shndx == SHN_UNDEF) { | |
| 1188 name = symtab_section->link->data + sym->st_name; | |
| 174 | 1189 sym_index = find_elf_sym(s1->dynsymtab_section, name); |
| 140 | 1190 if (sym_index) { |
| 174 | 1191 esym = &((Elf32_Sym *)s1->dynsymtab_section->data)[sym_index]; |
| 140 | 1192 type = ELF32_ST_TYPE(esym->st_info); |
| 1193 if (type == STT_FUNC) { | |
| 295 | 1194 put_got_entry(s1, R_JMP_SLOT, esym->st_size, |
| 140 | 1195 esym->st_info, |
| 1196 sym - (Elf32_Sym *)symtab_section->data); | |
| 1197 } else if (type == STT_OBJECT) { | |
| 1198 unsigned long offset; | |
| 1199 offset = bss_section->data_offset; | |
| 1200 /* XXX: which alignment ? */ | |
| 272 | 1201 offset = (offset + 16 - 1) & -16; |
| 174 | 1202 index = put_elf_sym(s1->dynsym, offset, esym->st_size, |
| 140 | 1203 esym->st_info, 0, |
| 1204 bss_section->sh_num, name); | |
| 174 | 1205 put_elf_reloc(s1->dynsym, bss_section, |
| 295 | 1206 offset, R_COPY, index); |
| 140 | 1207 offset += esym->st_size; |
| 1208 bss_section->data_offset = offset; | |
| 1209 } | |
| 1210 } else { | |
| 1211 /* STB_WEAK undefined symbols are accepted */ | |
| 1212 /* XXX: _fp_hw seems to be part of the ABI, so we ignore | |
| 1213 it */ | |
| 1214 if (ELF32_ST_BIND(sym->st_info) == STB_WEAK || | |
| 1215 !strcmp(name, "_fp_hw")) { | |
| 1216 } else { | |
| 174 | 1217 error_noabort("undefined symbol '%s'", name); |
| 140 | 1218 } |
| 1219 } | |
|
554
8c020de0af57
Fix earlier options.c break-up by migrating some stuff from tcc.h to tinycc.h.
Rob Landley <rob@landley.net>
parents:
553
diff
changeset
|
1220 } else if (tccg_rdynamic && |
| 272 | 1221 ELF32_ST_BIND(sym->st_info) != STB_LOCAL) { |
| 1222 /* if -rdynamic option, then export all non | |
| 1223 local symbols */ | |
| 1224 name = symtab_section->link->data + sym->st_name; | |
| 1225 put_elf_sym(s1->dynsym, sym->st_value, sym->st_size, | |
| 1226 sym->st_info, 0, | |
| 1227 sym->st_shndx, name); | |
| 140 | 1228 } |
| 1229 } | |
| 1230 | |
| 174 | 1231 if (s1->nb_errors) |
| 1232 goto fail; | |
| 1233 | |
| 140 | 1234 /* now look at unresolved dynamic symbols and export |
| 1235 corresponding symbol */ | |
| 174 | 1236 sym_end = (Elf32_Sym *)(s1->dynsymtab_section->data + |
| 1237 s1->dynsymtab_section->data_offset); | |
| 1238 for(esym = (Elf32_Sym *)s1->dynsymtab_section->data + 1; | |
| 140 | 1239 esym < sym_end; |
| 1240 esym++) { | |
| 1241 if (esym->st_shndx == SHN_UNDEF) { | |
| 174 | 1242 name = s1->dynsymtab_section->link->data + esym->st_name; |
| 140 | 1243 sym_index = find_elf_sym(symtab_section, name); |
| 1244 if (sym_index) { | |
| 272 | 1245 /* XXX: avoid adding a symbol if already |
| 1246 present because of -rdynamic ? */ | |
| 140 | 1247 sym = &((Elf32_Sym *)symtab_section->data)[sym_index]; |
| 174 | 1248 put_elf_sym(s1->dynsym, sym->st_value, sym->st_size, |
| 140 | 1249 sym->st_info, 0, |
| 1250 sym->st_shndx, name); | |
| 1251 } else { | |
| 1252 if (ELF32_ST_BIND(esym->st_info) == STB_WEAK) { | |
| 1253 /* weak symbols can stay undefined */ | |
| 1254 } else { | |
| 1255 warning("undefined dynamic symbol '%s'", name); | |
| 1256 } | |
| 1257 } | |
| 1258 } | |
| 1259 } | |
| 1260 } else { | |
| 1261 int nb_syms; | |
| 1262 /* shared library case : we simply export all the global symbols */ | |
| 1263 nb_syms = symtab_section->data_offset / sizeof(Elf32_Sym); | |
|
507
67453c7d623e
Clean up malloc() and friends to xmalloc/xzmalloc/xstrdup, and remove redundant
Rob Landley <rob@landley.net>
parents:
505
diff
changeset
|
1264 s1->symtab_to_dynsym = xzmalloc(sizeof(int) * nb_syms); |
| 140 | 1265 for(sym = (Elf32_Sym *)symtab_section->data + 1; |
| 1266 sym < sym_end; | |
| 1267 sym++) { | |
| 1268 if (ELF32_ST_BIND(sym->st_info) != STB_LOCAL) { | |
| 1269 name = symtab_section->link->data + sym->st_name; | |
| 174 | 1270 index = put_elf_sym(s1->dynsym, sym->st_value, sym->st_size, |
| 140 | 1271 sym->st_info, 0, |
| 1272 sym->st_shndx, name); | |
| 174 | 1273 s1->symtab_to_dynsym[sym - |
| 1274 (Elf32_Sym *)symtab_section->data] = | |
| 140 | 1275 index; |
| 1276 } | |
| 1277 } | |
| 1278 } | |
| 1279 | |
| 174 | 1280 build_got_entries(s1); |
| 140 | 1281 |
| 1282 /* add a list of needed dlls */ | |
| 174 | 1283 for(i = 0; i < s1->nb_loaded_dlls; i++) { |
| 1284 DLLReference *dllref = s1->loaded_dlls[i]; | |
| 140 | 1285 if (dllref->level == 0) |
| 1286 put_dt(dynamic, DT_NEEDED, put_elf_str(dynstr, dllref->name)); | |
| 1287 } | |
| 1288 /* XXX: currently, since we do not handle PIC code, we | |
| 1289 must relocate the readonly segments */ | |
| 1290 if (file_type == TCC_OUTPUT_DLL) | |
| 1291 put_dt(dynamic, DT_TEXTREL, 0); | |
| 1292 | |
| 1293 /* add necessary space for other entries */ | |
| 1294 saved_dynamic_data_offset = dynamic->data_offset; | |
| 1295 dynamic->data_offset += 8 * 9; | |
| 1296 } else { | |
| 1297 /* still need to build got entries in case of static link */ | |
| 174 | 1298 build_got_entries(s1); |
| 140 | 1299 } |
| 1300 } | |
| 1301 | |
| 1302 memset(&ehdr, 0, sizeof(ehdr)); | |
| 1303 | |
| 1304 /* we add a section for symbols */ | |
| 174 | 1305 strsec = new_section(s1, ".shstrtab", SHT_STRTAB, 0); |
| 140 | 1306 put_elf_str(strsec, ""); |
| 1307 | |
| 1308 /* compute number of sections */ | |
| 174 | 1309 shnum = s1->nb_sections; |
| 140 | 1310 |
| 1311 /* this array is used to reorder sections in the output file */ | |
|
507
67453c7d623e
Clean up malloc() and friends to xmalloc/xzmalloc/xstrdup, and remove redundant
Rob Landley <rob@landley.net>
parents:
505
diff
changeset
|
1312 section_order = xmalloc(sizeof(int) * shnum); |
| 140 | 1313 section_order[0] = 0; |
| 1314 sh_order_index = 1; | |
| 1315 | |
| 1316 /* compute number of program headers */ | |
| 1317 switch(file_type) { | |
| 1318 default: | |
| 1319 case TCC_OUTPUT_OBJ: | |
| 1320 phnum = 0; | |
| 1321 break; | |
| 1322 case TCC_OUTPUT_EXE: | |
|
554
8c020de0af57
Fix earlier options.c break-up by migrating some stuff from tcc.h to tinycc.h.
Rob Landley <rob@landley.net>
parents:
553
diff
changeset
|
1323 if (!tccg_static_link) |
| 140 | 1324 phnum = 4; |
| 1325 else | |
| 1326 phnum = 2; | |
| 1327 break; | |
| 1328 case TCC_OUTPUT_DLL: | |
| 1329 phnum = 3; | |
| 1330 break; | |
| 1331 } | |
| 1332 | |
| 1333 /* allocate strings for section names and decide if an unallocated | |
| 1334 section should be output */ | |
| 1335 /* NOTE: the strsec section comes last, so its size is also | |
| 1336 correct ! */ | |
| 174 | 1337 for(i = 1; i < s1->nb_sections; i++) { |
| 1338 s = s1->sections[i]; | |
| 140 | 1339 s->sh_name = put_elf_str(strsec, s->name); |
| 1340 /* when generating a DLL, we include relocations but we may | |
| 1341 patch them */ | |
| 1342 if (file_type == TCC_OUTPUT_DLL && | |
| 1343 s->sh_type == SHT_REL && | |
| 1344 !(s->sh_flags & SHF_ALLOC)) { | |
| 174 | 1345 prepare_dynamic_rel(s1, s); |
| 140 | 1346 } else if (do_debug || |
| 1347 file_type == TCC_OUTPUT_OBJ || | |
| 1348 (s->sh_flags & SHF_ALLOC) || | |
| 174 | 1349 i == (s1->nb_sections - 1)) { |
| 140 | 1350 /* we output all sections if debug or object file */ |
| 1351 s->sh_size = s->data_offset; | |
| 1352 } | |
| 1353 } | |
| 1354 | |
| 1355 /* allocate program segment headers */ | |
|
507
67453c7d623e
Clean up malloc() and friends to xmalloc/xzmalloc/xstrdup, and remove redundant
Rob Landley <rob@landley.net>
parents:
505
diff
changeset
|
1356 phdr = xzmalloc(phnum * sizeof(Elf32_Phdr)); |
| 140 | 1357 |
|
554
8c020de0af57
Fix earlier options.c break-up by migrating some stuff from tcc.h to tinycc.h.
Rob Landley <rob@landley.net>
parents:
553
diff
changeset
|
1358 if (tccg_output_format == TCC_OUTPUT_FORMAT_ELF) { |
| 325 | 1359 file_offset = sizeof(Elf32_Ehdr) + phnum * sizeof(Elf32_Phdr); |
| 1360 } else { | |
| 1361 file_offset = 0; | |
| 1362 } | |
| 140 | 1363 if (phnum > 0) { |
| 1364 /* compute section to program header mapping */ | |
|
554
8c020de0af57
Fix earlier options.c break-up by migrating some stuff from tcc.h to tinycc.h.
Rob Landley <rob@landley.net>
parents:
553
diff
changeset
|
1365 if (tccg_has_text_addr) { |
| 319 | 1366 int a_offset, p_offset; |
|
554
8c020de0af57
Fix earlier options.c break-up by migrating some stuff from tcc.h to tinycc.h.
Rob Landley <rob@landley.net>
parents:
553
diff
changeset
|
1367 addr = tccg_text_addr; |
| 319 | 1368 /* we ensure that (addr % ELF_PAGE_SIZE) == file_offset % |
| 1369 ELF_PAGE_SIZE */ | |
| 1370 a_offset = addr & (ELF_PAGE_SIZE - 1); | |
| 1371 p_offset = file_offset & (ELF_PAGE_SIZE - 1); | |
| 1372 if (a_offset < p_offset) | |
| 1373 a_offset += ELF_PAGE_SIZE; | |
| 1374 file_offset += (a_offset - p_offset); | |
| 1375 } else { | |
| 1376 if (file_type == TCC_OUTPUT_DLL) | |
| 1377 addr = 0; | |
| 1378 else | |
| 1379 addr = ELF_START_ADDR; | |
| 1380 /* compute address after headers */ | |
| 1381 addr += (file_offset & (ELF_PAGE_SIZE - 1)); | |
| 1382 } | |
| 1383 | |
| 140 | 1384 /* dynamic relocation table information, for .dynamic section */ |
| 1385 rel_size = 0; | |
| 1386 rel_addr = 0; | |
| 1387 | |
| 1388 /* leave one program header for the program interpreter */ | |
| 1389 ph = &phdr[0]; | |
| 1390 if (interp) | |
| 1391 ph++; | |
| 1392 | |
| 1393 for(j = 0; j < 2; j++) { | |
| 1394 ph->p_type = PT_LOAD; | |
| 1395 if (j == 0) | |
| 1396 ph->p_flags = PF_R | PF_X; | |
| 1397 else | |
| 1398 ph->p_flags = PF_R | PF_W; | |
| 1399 ph->p_align = ELF_PAGE_SIZE; | |
| 1400 | |
| 1401 /* we do the following ordering: interp, symbol tables, | |
| 1402 relocations, progbits, nobits */ | |
| 1403 /* XXX: do faster and simpler sorting */ | |
| 1404 for(k = 0; k < 5; k++) { | |
| 174 | 1405 for(i = 1; i < s1->nb_sections; i++) { |
| 1406 s = s1->sections[i]; | |
| 140 | 1407 /* compute if section should be included */ |
| 1408 if (j == 0) { | |
| 1409 if ((s->sh_flags & (SHF_ALLOC | SHF_WRITE)) != | |
| 1410 SHF_ALLOC) | |
| 1411 continue; | |
| 1412 } else { | |
| 1413 if ((s->sh_flags & (SHF_ALLOC | SHF_WRITE)) != | |
| 1414 (SHF_ALLOC | SHF_WRITE)) | |
| 1415 continue; | |
| 1416 } | |
| 1417 if (s == interp) { | |
| 1418 if (k != 0) | |
| 1419 continue; | |
| 1420 } else if (s->sh_type == SHT_DYNSYM || | |
| 1421 s->sh_type == SHT_STRTAB || | |
| 1422 s->sh_type == SHT_HASH) { | |
| 1423 if (k != 1) | |
| 1424 continue; | |
| 1425 } else if (s->sh_type == SHT_REL) { | |
| 1426 if (k != 2) | |
| 1427 continue; | |
| 1428 } else if (s->sh_type == SHT_NOBITS) { | |
| 1429 if (k != 4) | |
| 1430 continue; | |
| 1431 } else { | |
| 1432 if (k != 3) | |
| 1433 continue; | |
| 1434 } | |
| 1435 section_order[sh_order_index++] = i; | |
| 1436 | |
| 1437 /* section matches: we align it and add its size */ | |
| 319 | 1438 tmp = addr; |
| 1439 addr = (addr + s->sh_addralign - 1) & | |
| 140 | 1440 ~(s->sh_addralign - 1); |
| 319 | 1441 file_offset += addr - tmp; |
| 140 | 1442 s->sh_offset = file_offset; |
| 1443 s->sh_addr = addr; | |
| 1444 | |
| 1445 /* update program header infos */ | |
| 1446 if (ph->p_offset == 0) { | |
| 1447 ph->p_offset = file_offset; | |
| 1448 ph->p_vaddr = addr; | |
| 1449 ph->p_paddr = ph->p_vaddr; | |
| 1450 } | |
| 1451 /* update dynamic relocation infos */ | |
| 1452 if (s->sh_type == SHT_REL) { | |
| 1453 if (rel_size == 0) | |
| 1454 rel_addr = addr; | |
| 1455 rel_size += s->sh_size; | |
| 1456 } | |
| 1457 addr += s->sh_size; | |
| 1458 if (s->sh_type != SHT_NOBITS) | |
| 1459 file_offset += s->sh_size; | |
| 1460 } | |
| 1461 } | |
| 1462 ph->p_filesz = file_offset - ph->p_offset; | |
| 1463 ph->p_memsz = addr - ph->p_vaddr; | |
| 1464 ph++; | |
| 325 | 1465 if (j == 0) { |
|
554
8c020de0af57
Fix earlier options.c break-up by migrating some stuff from tcc.h to tinycc.h.
Rob Landley <rob@landley.net>
parents:
553
diff
changeset
|
1466 if (tccg_output_format == TCC_OUTPUT_FORMAT_ELF) { |
| 325 | 1467 /* if in the middle of a page, we duplicate the page in |
| 1468 memory so that one copy is RX and the other is RW */ | |
| 1469 if ((addr & (ELF_PAGE_SIZE - 1)) != 0) | |
| 1470 addr += ELF_PAGE_SIZE; | |
| 1471 } else { | |
| 1472 addr = (addr + ELF_PAGE_SIZE - 1) & ~(ELF_PAGE_SIZE - 1); | |
| 1473 file_offset = (file_offset + ELF_PAGE_SIZE - 1) & | |
| 1474 ~(ELF_PAGE_SIZE - 1); | |
| 1475 } | |
| 1476 } | |
| 140 | 1477 } |
| 1478 | |
| 1479 /* if interpreter, then add corresponing program header */ | |
| 1480 if (interp) { | |
| 1481 ph = &phdr[0]; | |
| 1482 | |
| 1483 ph->p_type = PT_INTERP; | |
| 1484 ph->p_offset = interp->sh_offset; | |
| 1485 ph->p_vaddr = interp->sh_addr; | |
| 1486 ph->p_paddr = ph->p_vaddr; | |
| 1487 ph->p_filesz = interp->sh_size; | |
| 1488 ph->p_memsz = interp->sh_size; | |
| 1489 ph->p_flags = PF_R; | |
| 1490 ph->p_align = interp->sh_addralign; | |
| 1491 } | |
| 1492 | |
| 1493 /* if dynamic section, then add corresponing program header */ | |
| 1494 if (dynamic) { | |
| 1495 Elf32_Sym *sym_end; | |
| 1496 | |
| 1497 ph = &phdr[phnum - 1]; | |
| 1498 | |
| 1499 ph->p_type = PT_DYNAMIC; | |
| 1500 ph->p_offset = dynamic->sh_offset; | |
| 1501 ph->p_vaddr = dynamic->sh_addr; | |
| 1502 ph->p_paddr = ph->p_vaddr; | |
| 1503 ph->p_filesz = dynamic->sh_size; | |
| 1504 ph->p_memsz = dynamic->sh_size; | |
| 1505 ph->p_flags = PF_R | PF_W; | |
| 1506 ph->p_align = dynamic->sh_addralign; | |
| 1507 | |
| 1508 /* put GOT dynamic section address */ | |
| 174 | 1509 put32(s1->got->data, dynamic->sh_addr); |
| 140 | 1510 |
| 228 | 1511 /* relocate the PLT */ |
| 1512 if (file_type == TCC_OUTPUT_EXE) { | |
| 1513 uint8_t *p, *p_end; | |
| 1514 | |
| 1515 p = s1->plt->data; | |
| 1516 p_end = p + s1->plt->data_offset; | |
| 255 | 1517 if (p < p_end) { |
|
555
646f1f0972b6
Update TCC_TARGET_* to TINYCC_TARGET_* (which is what new build sets).
Rob Landley <rob@landley.net>
parents:
554
diff
changeset
|
1518 #if defined(TINYCC_TARGET_I386) |
| 228 | 1519 put32(p + 2, get32(p + 2) + s1->got->sh_addr); |
| 255 | 1520 put32(p + 8, get32(p + 8) + s1->got->sh_addr); |
| 228 | 1521 p += 16; |
| 255 | 1522 while (p < p_end) { |
| 1523 put32(p + 2, get32(p + 2) + s1->got->sh_addr); | |
| 1524 p += 16; | |
| 1525 } | |
|
555
646f1f0972b6
Update TCC_TARGET_* to TINYCC_TARGET_* (which is what new build sets).
Rob Landley <rob@landley.net>
parents:
554
diff
changeset
|
1526 #elif defined(TINYCC_TARGET_ARM) |
| 295 | 1527 int x; |
| 1528 x=s1->got->sh_addr - s1->plt->sh_addr - 12; | |
| 1529 p +=16; | |
| 1530 while (p < p_end) { | |
| 1531 put32(p + 12, x + get32(p + 12) + s1->plt->data - p); | |
| 1532 p += 16; | |
| 1533 } | |
|
555
646f1f0972b6
Update TCC_TARGET_* to TINYCC_TARGET_* (which is what new build sets).
Rob Landley <rob@landley.net>
parents:
554
diff
changeset
|
1534 #elif defined(TINYCC_TARGET_C67) |
| 305 | 1535 /* XXX: TODO */ |
| 295 | 1536 #else |
| 1537 #error unsupported CPU | |
| 1538 #endif | |
| 228 | 1539 } |
| 1540 } | |
| 1541 | |
| 1542 /* relocate symbols in .dynsym */ | |
| 174 | 1543 sym_end = (Elf32_Sym *)(s1->dynsym->data + s1->dynsym->data_offset); |
| 1544 for(sym = (Elf32_Sym *)s1->dynsym->data + 1; | |
| 140 | 1545 sym < sym_end; |
| 1546 sym++) { | |
| 1547 if (sym->st_shndx == SHN_UNDEF) { | |
| 228 | 1548 /* relocate to the PLT if the symbol corresponds |
| 1549 to a PLT entry */ | |
| 1550 if (sym->st_value) | |
| 1551 sym->st_value += s1->plt->sh_addr; | |
| 140 | 1552 } else if (sym->st_shndx < SHN_LORESERVE) { |
| 1553 /* do symbol relocation */ | |
| 174 | 1554 sym->st_value += s1->sections[sym->st_shndx]->sh_addr; |
| 140 | 1555 } |
| 1556 } | |
| 228 | 1557 |
| 140 | 1558 /* put dynamic section entries */ |
| 1559 dynamic->data_offset = saved_dynamic_data_offset; | |
| 174 | 1560 put_dt(dynamic, DT_HASH, s1->dynsym->hash->sh_addr); |
| 140 | 1561 put_dt(dynamic, DT_STRTAB, dynstr->sh_addr); |
| 174 | 1562 put_dt(dynamic, DT_SYMTAB, s1->dynsym->sh_addr); |
| 140 | 1563 put_dt(dynamic, DT_STRSZ, dynstr->data_offset); |
| 1564 put_dt(dynamic, DT_SYMENT, sizeof(Elf32_Sym)); | |
| 1565 put_dt(dynamic, DT_REL, rel_addr); | |
| 1566 put_dt(dynamic, DT_RELSZ, rel_size); | |
| 1567 put_dt(dynamic, DT_RELENT, sizeof(Elf32_Rel)); | |
| 1568 put_dt(dynamic, DT_NULL, 0); | |
| 1569 } | |
| 1570 | |
| 1571 ehdr.e_phentsize = sizeof(Elf32_Phdr); | |
| 1572 ehdr.e_phnum = phnum; | |
| 1573 ehdr.e_phoff = sizeof(Elf32_Ehdr); | |
| 1574 } | |
| 1575 | |
| 1576 /* all other sections come after */ | |
| 174 | 1577 for(i = 1; i < s1->nb_sections; i++) { |
| 1578 s = s1->sections[i]; | |
| 140 | 1579 if (phnum > 0 && (s->sh_flags & SHF_ALLOC)) |
| 1580 continue; | |
| 1581 section_order[sh_order_index++] = i; | |
| 1582 | |
| 1583 file_offset = (file_offset + s->sh_addralign - 1) & | |
| 1584 ~(s->sh_addralign - 1); | |
| 1585 s->sh_offset = file_offset; | |
| 1586 if (s->sh_type != SHT_NOBITS) | |
| 1587 file_offset += s->sh_size; | |
| 1588 } | |
| 1589 | |
| 1590 /* if building executable or DLL, then relocate each section | |
| 1591 except the GOT which is already relocated */ | |
| 1592 if (file_type != TCC_OUTPUT_OBJ) { | |
| 174 | 1593 relocate_syms(s1, 0); |
| 1594 | |
| 1595 if (s1->nb_errors != 0) { | |
| 1596 fail: | |
| 1597 ret = -1; | |
| 1598 goto the_end; | |
| 1599 } | |
| 140 | 1600 |
| 1601 /* relocate sections */ | |
| 1602 /* XXX: ignore sections with allocated relocations ? */ | |
| 174 | 1603 for(i = 1; i < s1->nb_sections; i++) { |
| 1604 s = s1->sections[i]; | |
| 1605 if (s->reloc && s != s1->got) | |
| 140 | 1606 relocate_section(s1, s); |
| 1607 } | |
| 1608 | |
| 1609 /* relocate relocation entries if the relocation tables are | |
| 1610 allocated in the executable */ | |
| 174 | 1611 for(i = 1; i < s1->nb_sections; i++) { |
| 1612 s = s1->sections[i]; | |
| 140 | 1613 if ((s->sh_flags & SHF_ALLOC) && |
| 1614 s->sh_type == SHT_REL) { | |
| 174 | 1615 relocate_rel(s1, s); |
| 140 | 1616 } |
| 1617 } | |
| 1618 | |
| 1619 /* get entry point address */ | |
| 1620 if (file_type == TCC_OUTPUT_EXE) | |
| 283 | 1621 ehdr.e_entry = (unsigned long)tcc_get_symbol_err(s1, "_start"); |
| 140 | 1622 else |
| 1623 ehdr.e_entry = text_section->sh_addr; /* XXX: is it correct ? */ | |
| 1624 } | |
| 1625 | |
| 1626 /* write elf file */ | |
| 1627 if (file_type == TCC_OUTPUT_OBJ) | |
| 1628 mode = 0666; | |
| 1629 else | |
| 1630 mode = 0777; | |
| 325 | 1631 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, mode); |
| 174 | 1632 if (fd < 0) { |
| 1633 error_noabort("could not write '%s'", filename); | |
| 1634 goto fail; | |
| 1635 } | |
| 325 | 1636 f = fdopen(fd, "wb"); |
| 1637 | |
|
555
646f1f0972b6
Update TCC_TARGET_* to TINYCC_TARGET_* (which is what new build sets).
Rob Landley <rob@landley.net>
parents:
554
diff
changeset
|
1638 #ifdef TINYCC_TARGET_COFF |
|
554
8c020de0af57
Fix earlier options.c break-up by migrating some stuff from tcc.h to tinycc.h.
Rob Landley <rob@landley.net>
parents:
553
diff
changeset
|
1639 if (tccg_output_format == TCC_OUTPUT_FORMAT_COFF) { |
| 325 | 1640 tcc_output_coff(s1, f); |
| 1641 } else | |
| 1642 #endif | |
|
554
8c020de0af57
Fix earlier options.c break-up by migrating some stuff from tcc.h to tinycc.h.
Rob Landley <rob@landley.net>
parents:
553
diff
changeset
|
1643 if (tccg_output_format == TCC_OUTPUT_FORMAT_ELF) { |
| 325 | 1644 sort_syms(s1, symtab_section); |
| 1645 | |
| 1646 /* align to 4 */ | |
| 1647 file_offset = (file_offset + 3) & -4; | |
| 1648 | |
| 1649 /* fill header */ | |
| 1650 ehdr.e_ident[0] = ELFMAG0; | |
| 1651 ehdr.e_ident[1] = ELFMAG1; | |
| 1652 ehdr.e_ident[2] = ELFMAG2; | |
| 1653 ehdr.e_ident[3] = ELFMAG3; | |
| 1654 ehdr.e_ident[4] = ELFCLASS32; | |
| 1655 ehdr.e_ident[5] = ELFDATA2LSB; | |
| 1656 ehdr.e_ident[6] = EV_CURRENT; | |
| 1657 #ifdef __FreeBSD__ | |
| 1658 ehdr.e_ident[EI_OSABI] = ELFOSABI_FREEBSD; | |
| 1659 #endif | |
|
555
646f1f0972b6
Update TCC_TARGET_* to TINYCC_TARGET_* (which is what new build sets).
Rob Landley <rob@landley.net>
parents:
554
diff
changeset
|
1660 #ifdef TINYCC_TARGET_ARM |
|
409
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
1661 #ifdef TCC_ARM_EABI |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
1662 ehdr.e_ident[EI_OSABI] = 0; |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
1663 ehdr.e_flags = 4 << 24; |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
1664 #else |
| 325 | 1665 ehdr.e_ident[EI_OSABI] = ELFOSABI_ARM; |
| 1666 #endif | |
|
409
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
1667 #endif |
| 325 | 1668 switch(file_type) { |
| 1669 default: | |
| 1670 case TCC_OUTPUT_EXE: | |
| 1671 ehdr.e_type = ET_EXEC; | |
| 1672 break; | |
| 1673 case TCC_OUTPUT_DLL: | |
| 1674 ehdr.e_type = ET_DYN; | |
| 1675 break; | |
| 1676 case TCC_OUTPUT_OBJ: | |
| 1677 ehdr.e_type = ET_REL; | |
| 1678 break; | |
| 140 | 1679 } |
| 325 | 1680 ehdr.e_machine = EM_TCC_TARGET; |
| 1681 ehdr.e_version = EV_CURRENT; | |
| 1682 ehdr.e_shoff = file_offset; | |
| 1683 ehdr.e_ehsize = sizeof(Elf32_Ehdr); | |
| 1684 ehdr.e_shentsize = sizeof(Elf32_Shdr); | |
| 1685 ehdr.e_shnum = shnum; | |
| 1686 ehdr.e_shstrndx = shnum - 1; | |
| 1687 | |
| 1688 fwrite(&ehdr, 1, sizeof(Elf32_Ehdr), f); | |
| 1689 fwrite(phdr, 1, phnum * sizeof(Elf32_Phdr), f); | |
| 1690 offset = sizeof(Elf32_Ehdr) + phnum * sizeof(Elf32_Phdr); | |
| 1691 | |
| 1692 for(i=1;i<s1->nb_sections;i++) { | |
| 1693 s = s1->sections[section_order[i]]; | |
| 1694 if (s->sh_type != SHT_NOBITS) { | |
| 1695 while (offset < s->sh_offset) { | |
| 1696 fputc(0, f); | |
| 1697 offset++; | |
| 1698 } | |
| 1699 size = s->sh_size; | |
| 1700 fwrite(s->data, 1, size, f); | |
| 1701 offset += size; | |
| 1702 } | |
| 1703 } | |
| 1704 | |
| 1705 /* output section headers */ | |
| 1706 while (offset < ehdr.e_shoff) { | |
| 1707 fputc(0, f); | |
| 1708 offset++; | |
| 1709 } | |
| 140 | 1710 |
| 325 | 1711 for(i=0;i<s1->nb_sections;i++) { |
| 1712 sh = &shdr; | |
| 1713 memset(sh, 0, sizeof(Elf32_Shdr)); | |
| 1714 s = s1->sections[i]; | |
| 1715 if (s) { | |
| 1716 sh->sh_name = s->sh_name; | |
| 1717 sh->sh_type = s->sh_type; | |
| 1718 sh->sh_flags = s->sh_flags; | |
| 1719 sh->sh_entsize = s->sh_entsize; | |
| 1720 sh->sh_info = s->sh_info; | |
| 1721 if (s->link) | |
| 1722 sh->sh_link = s->link->sh_num; | |
| 1723 sh->sh_addralign = s->sh_addralign; | |
| 1724 sh->sh_addr = s->sh_addr; | |
| 1725 sh->sh_offset = s->sh_offset; | |
| 1726 sh->sh_size = s->sh_size; | |
| 1727 } | |
| 1728 fwrite(sh, 1, sizeof(Elf32_Shdr), f); | |
| 140 | 1729 } |
| 325 | 1730 } else { |
| 1731 tcc_output_binary(s1, f, section_order); | |
| 140 | 1732 } |
| 1733 fclose(f); | |
| 1734 | |
| 174 | 1735 ret = 0; |
| 1736 the_end: | |
|
481
0f5c38ddf450
Remove MEM_DEBUG and now-useless tcc_free() wrapper. Now, would anyone like to
Rob Landley <rob@landley.net>
parents:
479
diff
changeset
|
1737 free(s1->symtab_to_dynsym); |
|
0f5c38ddf450
Remove MEM_DEBUG and now-useless tcc_free() wrapper. Now, would anyone like to
Rob Landley <rob@landley.net>
parents:
479
diff
changeset
|
1738 free(section_order); |
|
0f5c38ddf450
Remove MEM_DEBUG and now-useless tcc_free() wrapper. Now, would anyone like to
Rob Landley <rob@landley.net>
parents:
479
diff
changeset
|
1739 free(phdr); |
|
0f5c38ddf450
Remove MEM_DEBUG and now-useless tcc_free() wrapper. Now, would anyone like to
Rob Landley <rob@landley.net>
parents:
479
diff
changeset
|
1740 free(s1->got_offsets); |
| 174 | 1741 return ret; |
| 140 | 1742 } |
| 1743 | |
| 1744 static void *load_data(int fd, unsigned long file_offset, unsigned long size) | |
| 1745 { | |
| 1746 void *data; | |
| 1747 | |
|
507
67453c7d623e
Clean up malloc() and friends to xmalloc/xzmalloc/xstrdup, and remove redundant
Rob Landley <rob@landley.net>
parents:
505
diff
changeset
|
1748 data = xmalloc(size); |
| 140 | 1749 lseek(fd, file_offset, SEEK_SET); |
| 1750 read(fd, data, size); | |
| 1751 return data; | |
| 1752 } | |
| 1753 | |
| 1754 typedef struct SectionMergeInfo { | |
| 1755 Section *s; /* corresponding existing section */ | |
| 1756 unsigned long offset; /* offset of the new section in the existing section */ | |
| 287 | 1757 uint8_t new_section; /* true if section 's' was added */ |
| 1758 uint8_t link_once; /* true if link once section */ | |
| 140 | 1759 } SectionMergeInfo; |
| 1760 | |
| 1761 /* load an object file and merge it with current files */ | |
| 1762 /* XXX: handle correctly stab (debug) info */ | |
| 1763 static int tcc_load_object_file(TCCState *s1, | |
| 1764 int fd, unsigned long file_offset) | |
| 1765 { | |
| 1766 Elf32_Ehdr ehdr; | |
| 1767 Elf32_Shdr *shdr, *sh; | |
| 174 | 1768 int size, i, j, offset, offseti, nb_syms, sym_index, ret; |
| 140 | 1769 unsigned char *strsec, *strtab; |
| 1770 int *old_to_new_syms; | |
| 1771 char *sh_name, *name; | |
| 1772 SectionMergeInfo *sm_table, *sm; | |
| 1773 Elf32_Sym *sym, *symtab; | |
| 1774 Elf32_Rel *rel, *rel_end; | |
| 1775 Section *s; | |
| 1776 | |
| 1777 if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr)) | |
| 174 | 1778 goto fail1; |
| 140 | 1779 if (ehdr.e_ident[0] != ELFMAG0 || |
| 1780 ehdr.e_ident[1] != ELFMAG1 || | |
| 1781 ehdr.e_ident[2] != ELFMAG2 || | |
| 1782 ehdr.e_ident[3] != ELFMAG3) | |
| 174 | 1783 goto fail1; |
| 140 | 1784 /* test if object file */ |
| 1785 if (ehdr.e_type != ET_REL) | |
| 174 | 1786 goto fail1; |
| 140 | 1787 /* test CPU specific stuff */ |
| 1788 if (ehdr.e_ident[5] != ELFDATA2LSB || | |
| 295 | 1789 ehdr.e_machine != EM_TCC_TARGET) { |
| 174 | 1790 fail1: |
| 1791 error_noabort("invalid object file"); | |
| 1792 return -1; | |
| 140 | 1793 } |
| 1794 /* read sections */ | |
| 1795 shdr = load_data(fd, file_offset + ehdr.e_shoff, | |
| 1796 sizeof(Elf32_Shdr) * ehdr.e_shnum); | |
|
507
67453c7d623e
Clean up malloc() and friends to xmalloc/xzmalloc/xstrdup, and remove redundant
Rob Landley <rob@landley.net>
parents:
505
diff
changeset
|
1797 sm_table = xzmalloc(sizeof(SectionMergeInfo) * ehdr.e_shnum); |
| 140 | 1798 |
| 1799 /* load section names */ | |
| 1800 sh = &shdr[ehdr.e_shstrndx]; | |
| 1801 strsec = load_data(fd, file_offset + sh->sh_offset, sh->sh_size); | |
| 1802 | |
| 1803 /* load symtab and strtab */ | |
| 174 | 1804 old_to_new_syms = NULL; |
| 140 | 1805 symtab = NULL; |
| 1806 strtab = NULL; | |
| 1807 nb_syms = 0; | |
| 1808 for(i = 1; i < ehdr.e_shnum; i++) { | |
| 1809 sh = &shdr[i]; | |
| 1810 if (sh->sh_type == SHT_SYMTAB) { | |
| 174 | 1811 if (symtab) { |
| 1812 error_noabort("object must contain only one symtab"); | |
| 1813 fail: | |
| 1814 ret = -1; | |
| 1815 goto the_end; | |
| 1816 } | |
| 140 | 1817 nb_syms = sh->sh_size / sizeof(Elf32_Sym); |
| 1818 symtab = load_data(fd, file_offset + sh->sh_offset, sh->sh_size); | |
| 1819 sm_table[i].s = symtab_section; | |
| 1820 | |
| 1821 /* now load strtab */ | |
| 1822 sh = &shdr[sh->sh_link]; | |
| 1823 strtab = load_data(fd, file_offset + sh->sh_offset, sh->sh_size); | |
| 1824 } | |
| 1825 } | |
| 1826 | |
| 1827 /* now examine each section and try to merge its content with the | |
| 1828 ones in memory */ | |
| 1829 for(i = 1; i < ehdr.e_shnum; i++) { | |
| 1830 /* no need to examine section name strtab */ | |
| 1831 if (i == ehdr.e_shstrndx) | |
| 1832 continue; | |
| 1833 sh = &shdr[i]; | |
| 1834 sh_name = strsec + sh->sh_name; | |
| 1835 /* ignore sections types we do not handle */ | |
| 1836 if (sh->sh_type != SHT_PROGBITS && | |
| 1837 sh->sh_type != SHT_REL && | |
|
409
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
1838 #ifdef TCC_ARM_EABI |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
1839 sh->sh_type != SHT_ARM_EXIDX && |
|
41f19a7b4093
Support for ARM EABI, by Daniel Glockner.
landley@driftwood
parents:
396
diff
changeset
|
1840 #endif |
| 140 | 1841 sh->sh_type != SHT_NOBITS) |
| 1842 continue; | |
| 1843 if (sh->sh_addralign < 1) | |
| 1844 sh->sh_addralign = 1; | |
| 1845 /* find corresponding section, if any */ | |
| 174 | 1846 for(j = 1; j < s1->nb_sections;j++) { |
| 1847 s = s1->sections[j]; | |
| 287 | 1848 if (!strcmp(s->name, sh_name)) { |
| 1849 if (!strncmp(sh_name, ".gnu.linkonce", | |
| 1850 sizeof(".gnu.linkonce") - 1)) { | |
| 1851 /* if a 'linkonce' section is already present, we | |
| 1852 do not add it again. It is a little tricky as | |
| 1853 symbols can still be defined in | |
| 1854 it. */ | |
| 1855 sm_table[i].link_once = 1; | |
| 1856 goto next; | |
| 1857 } else { | |
| 1858 goto found; | |
| 1859 } | |
| 1860 } | |
| 140 | 1861 } |
| 1862 /* not found: create new section */ | |
| 174 | 1863 s = new_section(s1, sh_name, sh->sh_type, sh->sh_flags); |
| 140 | 1864 /* take as much info as possible from the section. sh_link and |
| 1865 sh_info will be updated later */ | |
| 1866 s->sh_addralign = sh->sh_addralign; | |
| 1867 s->sh_entsize = sh->sh_entsize; | |
| 1868 sm_table[i].new_section = 1; | |
| 1869 found: | |
| 174 | 1870 if (sh->sh_type != s->sh_type) { |
| 1871 error_noabort("invalid section type"); | |
| 140 | 1872 goto fail; |
| 174 | 1873 } |
| 140 | 1874 |
| 1875 /* align start of section */ | |
| 1876 offset = s->data_offset; | |
| 1877 size = sh->sh_addralign - 1; | |
| 1878 offset = (offset + size) & ~size; | |
| 1879 if (sh->sh_addralign > s->sh_addralign) | |
| 1880 s->sh_addralign = sh->sh_addralign; | |
| 1881 s->data_offset = offset; | |
| 1882 sm_table[i].offset = offset; | |
| 1883 sm_table[i].s = s; | |
| 1884 /* concatenate sections */ | |
| 1885 size = sh->sh_size; | |
| 1886 if (sh->sh_type != SHT_NOBITS) { | |
| 1887 unsigned char *ptr; | |
| 1888 lseek(fd, file_offset + sh->sh_offset, SEEK_SET); | |
| 151 | 1889 ptr = section_ptr_add(s, size); |
| 140 | 1890 read(fd, ptr, size); |
| 151 | 1891 } else { |
| 1892 s->data_offset += size; | |
| 140 | 1893 } |
| 287 | 1894 next: ; |
| 140 | 1895 } |
| 1896 | |
| 1897 /* second short pass to update sh_link and sh_info fields of new | |
| 1898 sections */ | |
| 1899 for(i = 1; i < ehdr.e_shnum; i++) { | |
| 1900 s = sm_table[i].s; | |
| 1901 if (!s || !sm_table[i].new_section) | |
| 1902 continue; | |
| 1903 sh = &shdr[i]; | |
| 1904 if (sh->sh_link > 0) | |
| 1905 s->link = sm_table[sh->sh_link].s; | |
| 1906 if (sh->sh_type == SHT_REL) { | |
| 1907 s->sh_info = sm_table[sh->sh_info].s->sh_num; | |
| 1908 /* update backward link */ | |
| 174 | 1909 s1->sections[s->sh_info]->reloc = s; |
| 140 | 1910 } |
| 1911 } | |
|
396
928147ea8ab6
Fix "invalid relocation entry" problem on ubuntu. Fix from Bernhard
landley@driftwood
parents:
394
diff
changeset
|
1912 sm = sm_table; |
| 140 | 1913 |
| 1914 /* resolve symbols */ | |
|
507
67453c7d623e
Clean up malloc() and friends to xmalloc/xzmalloc/xstrdup, and remove redundant
Rob Landley <rob@landley.net>
parents:
505
diff
changeset
|
1915 old_to_new_syms = xzmalloc(nb_syms * sizeof(int)); |
| 140 | 1916 |
| 1917 sym = symtab + 1; | |
| 1918 for(i = 1; i < nb_syms; i++, sym++) { | |
| 1919 if (sym->st_shndx != SHN_UNDEF && | |
| 1920 sym->st_shndx < SHN_LORESERVE) { | |
| 1921 sm = &sm_table[sym->st_shndx]; | |
| 287 | 1922 if (sm->link_once) { |
| 1923 /* if a symbol is in a link once section, we use the | |
| 1924 already defined symbol. It is very important to get | |
| 1925 correct relocations */ | |
| 1926 if (ELF32_ST_BIND(sym->st_info) != STB_LOCAL) { | |
| 1927 name = strtab + sym->st_name; | |
| 1928 sym_index = find_elf_sym(symtab_section, name); | |
| 1929 if (sym_index) | |
| 1930 old_to_new_syms[i] = sym_index; | |
| 1931 } | |
| 1932 continue; | |
| 1933 } | |
| 140 | 1934 /* if no corresponding section added, no need to add symbol */ |
| 1935 if (!sm->s) | |
| 1936 continue; | |
| 1937 /* convert section number */ | |
| 1938 sym->st_shndx = sm->s->sh_num; | |
| 1939 /* offset value */ | |
| 1940 sym->st_value += sm->offset; | |
| 1941 } | |
| 1942 /* add symbol */ | |
| 1943 name = strtab + sym->st_name; | |
| 1944 sym_index = add_elf_sym(symtab_section, sym->st_value, sym->st_size, | |
| 356 | 1945 sym->st_info, sym->st_other, |
| 1946 sym->st_shndx, name); | |
| 140 | 1947 old_to_new_syms[i] = sym_index; |
| 1948 } | |
| 1949 | |
| 1950 /* third pass to patch relocation entries */ | |
| 1951 for(i = 1; i < ehdr.e_shnum; i++) { | |
| 1952 s = sm_table[i].s; | |
| 1953 if (!s) | |
| 1954 continue; | |
| 1955 sh = &shdr[i]; | |
| 1956 offset = sm_table[i].offset; | |
| 1957 switch(s->sh_type) { | |
| 1958 case SHT_REL: | |
| 1959 /* take relocation offset information */ | |
| 1960 offseti = sm_table[sh->sh_info].offset; | |
| 1961 rel_end = (Elf32_Rel *)(s->data + s->data_offset); | |
| 1962 for(rel = (Elf32_Rel *)(s->data + offset); | |
| 1963 rel < rel_end; | |
| 1964 rel++) { | |
| 1965 int type; | |
| 1966 unsigned sym_index; | |
| 1967 /* convert symbol index */ | |
| 1968 type = ELF32_R_TYPE(rel->r_info); | |
| 1969 sym_index = ELF32_R_SYM(rel->r_info); | |
| 1970 /* NOTE: only one symtab assumed */ | |
| 1971 if (sym_index >= nb_syms) | |
| 1972 goto invalid_reloc; | |
| 1973 sym_index = old_to_new_syms[sym_index]; | |
|
396
928147ea8ab6
Fix "invalid relocation entry" problem on ubuntu. Fix from Bernhard
landley@driftwood
parents:
394
diff
changeset
|
1974 /* ignore link_once in rel section. */ |
|
928147ea8ab6
Fix "invalid relocation entry" problem on ubuntu. Fix from Bernhard
landley@driftwood
parents:
394
diff
changeset
|
1975 if (!sym_index && !sm->link_once) { |
| 140 | 1976 invalid_reloc: |
|
396
928147ea8ab6
Fix "invalid relocation entry" problem on ubuntu. Fix from Bernhard
landley@driftwood
parents:
394
diff
changeset
|
1977 error_noabort("Invalid relocation entry [%2d] '%s' @ %.8x", |
|
928147ea8ab6
Fix "invalid relocation entry" problem on ubuntu. Fix from Bernhard
landley@driftwood
parents:
394
diff
changeset
|
1978 i, strsec + sh->sh_name, rel->r_offset); |
| 174 | 1979 goto fail; |
| 140 | 1980 } |
| 1981 rel->r_info = ELF32_R_INFO(sym_index, type); | |
| 1982 /* offset the relocation offset */ | |
| 1983 rel->r_offset += offseti; | |
| 1984 } | |
| 1985 break; | |
| 1986 default: | |
| 1987 break; | |
| 1988 } | |
| 1989 } | |
| 174 | 1990 |
| 1991 ret = 0; | |
| 1992 the_end: | |
|
481
0f5c38ddf450
Remove MEM_DEBUG and now-useless tcc_free() wrapper. Now, would anyone like to
Rob Landley <rob@landley.net>
parents:
479
diff
changeset
|
1993 free(symtab); |
|
0f5c38ddf450
Remove MEM_DEBUG and now-useless tcc_free() wrapper. Now, would anyone like to
Rob Landley <rob@landley.net>
parents:
479
diff
changeset
|
1994 free(strtab); |
|
0f5c38ddf450
Remove MEM_DEBUG and now-useless tcc_free() wrapper. Now, would anyone like to
Rob Landley <rob@landley.net>
parents:
479
diff
changeset
|
1995 free(old_to_new_syms); |
|
0f5c38ddf450
Remove MEM_DEBUG and now-useless tcc_free() wrapper. Now, would anyone like to
Rob Landley <rob@landley.net>
parents:
479
diff
changeset
|
1996 free(sm_table); |
|
0f5c38ddf450
Remove MEM_DEBUG and now-useless tcc_free() wrapper. Now, would anyone like to
Rob Landley <rob@landley.net>
parents:
479
diff
changeset
|
1997 free(strsec); |
|
0f5c38ddf450
Remove MEM_DEBUG and now-useless tcc_free() wrapper. Now, would anyone like to
Rob Landley <rob@landley.net>
parents:
479
diff
changeset
|
1998 free(shdr); |
| 174 | 1999 return ret; |
| 140 | 2000 } |
| 2001 | |
| 2002 #define ARMAG "!<arch>\012" /* For COFF and a.out archives */ | |
| 2003 | |
| 2004 typedef struct ArchiveHeader { | |
| 2005 char ar_name[16]; /* name of this member */ | |
| 2006 char ar_date[12]; /* file mtime */ | |
| 2007 char ar_uid[6]; /* owner uid; printed as decimal */ | |
| 2008 char ar_gid[6]; /* owner gid; printed as decimal */ | |
| 2009 char ar_mode[8]; /* file mode, printed as octal */ | |
| 2010 char ar_size[10]; /* file size, printed as decimal */ | |
| 2011 char ar_fmag[2]; /* should contain ARFMAG */ | |
| 2012 } ArchiveHeader; | |
| 2013 | |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
2014 static int get_be32(uint8_t *b) |
| 259 | 2015 { |
| 2016 return b[3] | (b[2] << 8) | (b[1] << 16) | (b[0] << 24); | |
| 2017 } | |
| 2018 | |
| 2019 /* load only the objects which resolve undefined symbols */ | |
| 2020 static int tcc_load_alacarte(TCCState *s1, int fd, int size) | |
| 2021 { | |
| 2022 int i, bound, nsyms, sym_index, off, ret; | |
| 2023 uint8_t *data; | |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
2024 char *ar_names, *p; |
|
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
2025 uint8_t *ar_index; |
| 259 | 2026 Elf32_Sym *sym; |
| 2027 | |
|
507
67453c7d623e
Clean up malloc() and friends to xmalloc/xzmalloc/xstrdup, and remove redundant
Rob Landley <rob@landley.net>
parents:
505
diff
changeset
|
2028 data = xmalloc(size); |
| 259 | 2029 if (read(fd, data, size) != size) |
| 2030 goto fail; | |
| 2031 nsyms = get_be32(data); | |
| 2032 ar_index = data + 4; | |
| 2033 ar_names = ar_index + nsyms * 4; | |
| 2034 | |
| 2035 do { | |
| 2036 bound = 0; | |
| 2037 for(p = ar_names, i = 0; i < nsyms; i++, p += strlen(p)+1) { | |
| 2038 sym_index = find_elf_sym(symtab_section, p); | |
| 2039 if(sym_index) { | |
| 2040 sym = &((Elf32_Sym *)symtab_section->data)[sym_index]; | |
| 2041 if(sym->st_shndx == SHN_UNDEF) { | |
| 2042 off = get_be32(ar_index + i * 4) + sizeof(ArchiveHeader); | |
| 2043 #if 0 | |
| 2044 printf("%5d\t%s\t%08x\n", i, p, sym->st_shndx); | |
| 2045 #endif | |
| 2046 ++bound; | |
| 2047 lseek(fd, off, SEEK_SET); | |
| 2048 if(tcc_load_object_file(s1, fd, off) < 0) { | |
| 2049 fail: | |
| 2050 ret = -1; | |
| 2051 goto the_end; | |
| 2052 } | |
| 2053 } | |
| 2054 } | |
| 2055 } | |
| 2056 } while(bound); | |
| 2057 ret = 0; | |
| 2058 the_end: | |
|
481
0f5c38ddf450
Remove MEM_DEBUG and now-useless tcc_free() wrapper. Now, would anyone like to
Rob Landley <rob@landley.net>
parents:
479
diff
changeset
|
2059 free(data); |
| 259 | 2060 return ret; |
| 2061 } | |
| 2062 | |
| 140 | 2063 /* load a '.a' file */ |
| 2064 static int tcc_load_archive(TCCState *s1, int fd) | |
| 2065 { | |
| 2066 ArchiveHeader hdr; | |
| 2067 char ar_size[11]; | |
| 2068 char ar_name[17]; | |
| 2069 char magic[8]; | |
| 2070 int size, len, i; | |
| 2071 unsigned long file_offset; | |
| 2072 | |
| 2073 /* skip magic which was already checked */ | |
| 2074 read(fd, magic, sizeof(magic)); | |
| 2075 | |
| 2076 for(;;) { | |
| 2077 len = read(fd, &hdr, sizeof(hdr)); | |
| 2078 if (len == 0) | |
| 2079 break; | |
| 174 | 2080 if (len != sizeof(hdr)) { |
| 2081 error_noabort("invalid archive"); | |
| 2082 return -1; | |
| 2083 } | |
| 140 | 2084 memcpy(ar_size, hdr.ar_size, sizeof(hdr.ar_size)); |
| 2085 ar_size[sizeof(hdr.ar_size)] = '\0'; | |
| 2086 size = strtol(ar_size, NULL, 0); | |
| 2087 memcpy(ar_name, hdr.ar_name, sizeof(hdr.ar_name)); | |
| 2088 for(i = sizeof(hdr.ar_name) - 1; i >= 0; i--) { | |
| 2089 if (ar_name[i] != ' ') | |
| 2090 break; | |
| 2091 } | |
| 2092 ar_name[i + 1] = '\0'; | |
| 2093 // printf("name='%s' size=%d %s\n", ar_name, size, ar_size); | |
| 2094 file_offset = lseek(fd, 0, SEEK_CUR); | |
| 259 | 2095 /* align to even */ |
| 2096 size = (size + 1) & ~1; | |
| 2097 if (!strcmp(ar_name, "/")) { | |
| 2098 /* coff symbol table : we handle it */ | |
| 2099 if(s1->alacarte_link) | |
| 2100 return tcc_load_alacarte(s1, fd, size); | |
| 2101 } else if (!strcmp(ar_name, "//") || | |
| 2102 !strcmp(ar_name, "__.SYMDEF") || | |
| 2103 !strcmp(ar_name, "__.SYMDEF/") || | |
| 2104 !strcmp(ar_name, "ARFILENAMES/")) { | |
| 140 | 2105 /* skip symbol table or archive names */ |
| 2106 } else { | |
| 174 | 2107 if (tcc_load_object_file(s1, fd, file_offset) < 0) |
| 2108 return -1; | |
| 140 | 2109 } |
| 2110 lseek(fd, file_offset + size, SEEK_SET); | |
| 2111 } | |
| 2112 return 0; | |
| 2113 } | |
| 2114 | |
| 2115 /* load a DLL and all referenced DLLs. 'level = 0' means that the DLL | |
| 2116 is referenced by the user (so it should be added as DT_NEEDED in | |
| 2117 the generated ELF file) */ | |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
2118 static int tcc_load_dll(TCCState *s1, int fd, char *filename, int level) |
| 140 | 2119 { |
| 2120 Elf32_Ehdr ehdr; | |
| 2121 Elf32_Shdr *shdr, *sh, *sh1; | |
| 394 | 2122 int i, j, nb_syms, nb_dts, sym_bind, ret; |
| 140 | 2123 Elf32_Sym *sym, *dynsym; |
| 2124 Elf32_Dyn *dt, *dynamic; | |
| 2125 unsigned char *dynstr; | |
|
553
4533aa54ffcf
More simplification and attacking warnings.
Rob Landley <rob@landley.net>
parents:
547
diff
changeset
|
2126 char *name, *soname, *p; |
| 140 | 2127 DLLReference *dllref; |
| 2128 | |
| 2129 read(fd, &ehdr, sizeof(ehdr)); | |
| 2130 | |
| 2131 /* test CPU specific stuff */ | |
| 2132 if (ehdr.e_ident[5] != ELFDATA2LSB || | |
| 295 | 2133 ehdr.e_machine != EM_TCC_TARGET) { |
| 174 | 2134 error_noabort("bad architecture"); |
| 2135 return -1; | |
| 2136 } | |
| 140 | 2137 |
| 2138 /* read sections */ | |
| 2139 shdr = load_data(fd, ehdr.e_shoff, sizeof(Elf32_Shdr) * ehdr.e_shnum); | |
| 2140 | |
| 2141 /* load dynamic section and dynamic symbols */ | |
| 2142 nb_syms = 0; | |
| 2143 nb_dts = 0; | |
| 2144 dynamic = NULL; | |
| 2145 dynsym = NULL; /* avoid warning */ | |
| 2146 dynstr = NULL; /* avoid warning */ | |
| 2147 for(i = 0, sh = shdr; i < ehdr.e_shnum; i++, sh++) { | |
| 2148 switch(sh->sh_type) { | |
| 2149 case SHT_DYNAMIC: | |
| 2150 nb_dts = sh->sh_size / sizeof(Elf32_Dyn); | |
| 2151 dynamic = load_data(fd, sh->sh_offset, sh->sh_size); | |
| 2152 break; | |
| 2153 case SHT_DYNSYM: | |
| 2154 nb_syms = sh->sh_size / sizeof(Elf32_Sym); | |
| 2155 dynsym = load_data(fd, sh->sh_offset, sh->sh_size); | |
| 2156 sh1 = &shdr[sh->sh_link]; | |
| 2157 dynstr = load_data(fd, sh1->sh_offset, sh1->sh_size); | |
| 2158 break; | |
| 2159 default: | |
| 2160 break; | |
| 2161 } | |
| 2162 } | |
| 2163 | |
| 2164 /* compute the real library name */ | |
| 2165 soname = filename; | |
| 2166 p = strrchr(soname, '/'); | |
| 2167 if (p) | |
| 2168 soname = p + 1; | |
| 2169 | |
| 2170 for(i = 0, dt = dynamic; i < nb_dts; i++, dt++) { | |
| 2171 if (dt->d_tag == DT_SONAME) { | |
| 2172 soname = dynstr + dt->d_un.d_val; | |
| 2173 } | |
| 2174 } | |
| 2175 | |
| 2176 /* if the dll is already loaded, do not load it */ | |
| 174 | 2177 for(i = 0; i < s1->nb_loaded_dlls; i++) { |
| 2178 dllref = s1->loaded_dlls[i]; | |
| 140 | 2179 if (!strcmp(soname, dllref->name)) { |
| 2180 /* but update level if needed */ | |
| 2181 if (level < dllref->level) | |
| 2182 dllref->level = level; | |
| 174 | 2183 ret = 0; |
| 140 | 2184 goto the_end; |
| 2185 } | |
| 2186 } | |
| 2187 | |
| 2188 // printf("loading dll '%s'\n", soname); | |
| 2189 | |
| 2190 /* add the dll and its level */ | |
|
507
67453c7d623e
Clean up malloc() and friends to xmalloc/xzmalloc/xstrdup, and remove redundant
Rob Landley <rob@landley.net>
parents:
505
diff
changeset
|
2191 dllref = xmalloc(sizeof(DLLReference) + strlen(soname)); |
| 140 | 2192 dllref->level = level; |
| 2193 strcpy(dllref->name, soname); | |
| 174 | 2194 dynarray_add((void ***)&s1->loaded_dlls, &s1->nb_loaded_dlls, dllref); |
| 140 | 2195 |
| 2196 /* add dynamic symbols in dynsym_section */ | |
| 2197 for(i = 1, sym = dynsym + 1; i < nb_syms; i++, sym++) { | |
| 2198 sym_bind = ELF32_ST_BIND(sym->st_info); | |
| 2199 if (sym_bind == STB_LOCAL) | |
| 2200 continue; | |
| 2201 name = dynstr + sym->st_name; | |
| 174 | 2202 add_elf_sym(s1->dynsymtab_section, sym->st_value, sym->st_size, |
| 372 | 2203 sym->st_info, sym->st_other, sym->st_shndx, name); |
| 140 | 2204 } |
| 2205 | |
| 2206 /* load all referenced DLLs */ | |
| 2207 for(i = 0, dt = dynamic; i < nb_dts; i++, dt++) { | |
| 2208 switch(dt->d_tag) { | |
| 2209 case DT_NEEDED: | |
| 2210 name = dynstr + dt->d_un.d_val; | |
| 394 | 2211 for(j = 0; j < s1->nb_loaded_dlls; j++) { |
| 2212 dllref = s1->loaded_dlls[j]; | |
| 140 | 2213 if (!strcmp(name, dllref->name)) |
| 2214 goto already_loaded; | |
| 2215 } | |
| 174 | 2216 if (tcc_add_dll(s1, name, AFF_REFERENCED_DLL) < 0) { |
| 2217 error_noabort("referenced dll '%s' not found", name); | |
| 2218 ret = -1; | |
| 2219 goto the_end; | |
| 2220 } | |
| 140 | 2221 already_loaded: |
| 2222 break; | |
| 2223 } | |
| 2224 } | |
| 174 | 2225 ret = 0; |
| 140 | 2226 the_end: |
|
481
0f5c38ddf450
Remove MEM_DEBUG and now-useless tcc_free() wrapper. Now, would anyone like to
Rob Landley <rob@landley.net>
parents:
479
diff
changeset
|
2227 free(dynstr); |
|
0f5c38ddf450
Remove MEM_DEBUG and now-useless tcc_free() wrapper. Now, would anyone like to
Rob Landley <rob@landley.net>
parents:
479
diff
changeset
|
2228 free(dynsym); |
|
0f5c38ddf450
Remove MEM_DEBUG and now-useless tcc_free() wrapper. Now, would anyone like to
Rob Landley <rob@landley.net>
parents:
479
diff
changeset
|
2229 free(dynamic); |
|
0f5c38ddf450
Remove MEM_DEBUG and now-useless tcc_free() wrapper. Now, would anyone like to
Rob Landley <rob@landley.net>
parents:
479
diff
changeset
|
2230 free(shdr); |
| 174 | 2231 return ret; |
| 140 | 2232 } |
| 2233 | |
| 191 | 2234 #define LD_TOK_NAME 256 |
| 2235 #define LD_TOK_EOF (-1) | |
| 2236 | |
| 2237 /* return next ld script token */ | |
| 2238 static int ld_next(TCCState *s1, char *name, int name_size) | |
| 140 | 2239 { |
| 191 | 2240 int c; |
| 140 | 2241 char *q; |
| 2242 | |
| 191 | 2243 redo: |
|
479
7909d3c7e712
Replace global "ch" with "fch" so it's slightly easier to grep for. (It's the
Rob Landley <rob@landley.net>
parents:
469
diff
changeset
|
2244 switch(fch) { |
| 191 | 2245 case ' ': |
| 2246 case '\t': | |
| 2247 case '\f': | |
| 2248 case '\v': | |
| 2249 case '\r': | |
| 2250 case '\n': | |
| 2251 inp(); | |
| 2252 goto redo; | |
| 2253 case '/': | |
| 2254 minp(); | |
|
479
7909d3c7e712
Replace global "ch" with "fch" so it's slightly easier to grep for. (It's the
Rob Landley <rob@landley.net>
parents:
469
diff
changeset
|
2255 if (fch == '*') { |
| 230 | 2256 file->buf_ptr = parse_comment(file->buf_ptr); |
|
479
7909d3c7e712
Replace global "ch" with "fch" so it's slightly easier to grep for. (It's the
Rob Landley <rob@landley.net>
parents:
469
diff
changeset
|
2257 fch = file->buf_ptr[0]; |
| 191 | 2258 goto redo; |
| 2259 } else { | |
| 2260 q = name; | |
| 2261 *q++ = '/'; | |
| 2262 goto parse_name; | |
| 2263 } | |
| 2264 break; | |
| 2265 case 'a' ... 'z': | |
| 2266 case 'A' ... 'Z': | |
| 2267 case '_': | |
| 2268 case '\\': | |
| 2269 case '.': | |
| 2270 case '$': | |
| 2271 case '~': | |
| 2272 q = name; | |
| 2273 parse_name: | |
| 2274 for(;;) { | |
|
479
7909d3c7e712
Replace global "ch" with "fch" so it's slightly easier to grep for. (It's the
Rob Landley <rob@landley.net>
parents:
469
diff
changeset
|
2275 if (!((fch >= 'a' && fch <= 'z') || |
|
7909d3c7e712
Replace global "ch" with "fch" so it's slightly easier to grep for. (It's the
Rob Landley <rob@landley.net>
parents:
469
diff
changeset
|
2276 (fch >= 'A' && fch <= 'Z') || |
|
7909d3c7e712
Replace global "ch" with "fch" so it's slightly easier to grep for. (It's the
Rob Landley <rob@landley.net>
parents:
469
diff
changeset
|
2277 (fch >= '0' && fch <= '9') || |
|
7909d3c7e712
Replace global "ch" with "fch" so it's slightly easier to grep for. (It's the
Rob Landley <rob@landley.net>
parents:
469
diff
changeset
|
2278 strchr("/.-_+=$:\\,~", fch))) |
| 191 | 2279 break; |
| 2280 if ((q - name) < name_size - 1) { | |
|
479
7909d3c7e712
Replace global "ch" with "fch" so it's slightly easier to grep for. (It's the
Rob Landley <rob@landley.net>
parents:
469
diff
changeset
|
2281 *q++ = fch; |
| 191 | 2282 } |
| 2283 minp(); | |
| 2284 } | |
| 2285 *q = '\0'; | |
| 2286 c = LD_TOK_NAME; | |
| 2287 break; | |
| 2288 case CH_EOF: | |
| 2289 c = LD_TOK_EOF; | |
| 2290 break; | |
| 2291 default: | |
|
479
7909d3c7e712
Replace global "ch" with "fch" so it's slightly easier to grep for. (It's the
Rob Landley <rob@landley.net>
parents:
469
diff
changeset
|
2292 c = fch; |
| 191 | 2293 inp(); |
| 2294 break; | |
| 140 | 2295 } |
| 191 | 2296 #if 0 |
| 2297 printf("tok=%c %d\n", c, c); | |
| 2298 if (c == LD_TOK_NAME) | |
| 2299 printf(" name=%s\n", name); | |
| 2300 #endif | |
| 2301 return c; | |
| 140 | 2302 } |
| 191 | 2303 |
| 383 | 2304 static int ld_add_file_list(TCCState *s1, int as_needed) |
| 2305 { | |
| 2306 char filename[1024]; | |
| 2307 int t, ret; | |
| 2308 | |
| 2309 t = ld_next(s1, filename, sizeof(filename)); | |
| 2310 if (t != '(') | |
| 2311 expect("("); | |
| 2312 t = ld_next(s1, filename, sizeof(filename)); | |
| 2313 for(;;) { | |
| 2314 if (t == LD_TOK_EOF) { | |
| 2315 error_noabort("unexpected end of file"); | |
| 2316 return -1; | |
| 2317 } else if (t == ')') { | |
| 2318 break; | |
| 2319 } else if (t != LD_TOK_NAME) { | |
| 2320 error_noabort("filename expected"); | |
| 2321 return -1; | |
| 2322 } | |
| 2323 if (!strcmp(filename, "AS_NEEDED")) { | |
| 2324 ret = ld_add_file_list(s1, 1); | |
| 2325 if (ret) | |
| 2326 return ret; | |
| 2327 } else { | |
| 2328 /* TODO: Implement AS_NEEDED support. Ignore it for now */ | |
|
564
d89a6822b7e0
Use library search path for crt?.o, and for ld script libraries with no path.
Rob Landley <rob@landley.net>
parents:
555
diff
changeset
|
2329 if (!as_needed) { |
|
d89a6822b7e0
Use library search path for crt?.o, and for ld script libraries with no path.
Rob Landley <rob@landley.net>
parents:
555
diff
changeset
|
2330 if (*filename=='/') tcc_add_file(s1, filename); |
|
d89a6822b7e0
Use library search path for crt?.o, and for ld script libraries with no path.
Rob Landley <rob@landley.net>
parents:
555
diff
changeset
|
2331 else tcc_add_dll(s1, filename, AFF_PRINT_ERROR); |
|
d89a6822b7e0
Use library search path for crt?.o, and for ld script libraries with no path.
Rob Landley <rob@landley.net>
parents:
555
diff
changeset
|
2332 } |
| 383 | 2333 } |
| 2334 t = ld_next(s1, filename, sizeof(filename)); | |
| 2335 if (t == ',') { | |
| 2336 t = ld_next(s1, filename, sizeof(filename)); | |
| 2337 } | |
| 2338 } | |
| 2339 return 0; | |
| 2340 } | |
| 2341 | |
| 140 | 2342 /* interpret a subset of GNU ldscripts to handle the dummy libc.so |
| 2343 files */ | |
| 2344 static int tcc_load_ldscript(TCCState *s1) | |
| 2345 { | |
| 2346 char cmd[64]; | |
| 2347 char filename[1024]; | |
| 383 | 2348 int t, ret; |
| 140 | 2349 |
|
479
7909d3c7e712
Replace global "ch" with "fch" so it's slightly easier to grep for. (It's the
Rob Landley <rob@landley.net>
parents:
469
diff
changeset
|
2350 //fch = file->buf_ptr[0]; |
|
7909d3c7e712
Replace global "ch" with "fch" so it's slightly easier to grep for. (It's the
Rob Landley <rob@landley.net>
parents:
469
diff
changeset
|
2351 fch = handle_eob(); |
| 140 | 2352 for(;;) { |
| 191 | 2353 t = ld_next(s1, cmd, sizeof(cmd)); |
| 2354 if (t == LD_TOK_EOF) | |
| 140 | 2355 return 0; |
| 191 | 2356 else if (t != LD_TOK_NAME) |
| 140 | 2357 return -1; |
| 2358 if (!strcmp(cmd, "INPUT") || | |
| 2359 !strcmp(cmd, "GROUP")) { | |
| 383 | 2360 ret = ld_add_file_list(s1, 0); |
| 2361 if (ret) | |
| 2362 return ret; | |
| 248 | 2363 } else if (!strcmp(cmd, "OUTPUT_FORMAT") || |
| 2364 !strcmp(cmd, "TARGET")) { | |
| 2365 /* ignore some commands */ | |
| 2366 t = ld_next(s1, cmd, sizeof(cmd)); | |
| 2367 if (t != '(') | |
| 2368 expect("("); | |
| 2369 for(;;) { | |
| 2370 t = ld_next(s1, filename, sizeof(filename)); | |
| 2371 if (t == LD_TOK_EOF) { | |
| 2372 error_noabort("unexpected end of file"); | |
| 2373 return -1; | |
| 2374 } else if (t == ')') { | |
| 2375 break; | |
| 2376 } | |
| 2377 } | |
| 140 | 2378 } else { |
| 2379 return -1; | |
| 2380 } | |
| 2381 } | |
| 2382 return 0; | |
| 2383 } |