[279] | 1 | /*
|
---|
| 2 | * ELF file handling for TCC
|
---|
[331] | 3 | *
|
---|
[279] | 4 | * Copyright (c) 2001-2004 Fabrice Bellard
|
---|
| 5 | *
|
---|
| 6 | * This library is free software; you can redistribute it and/or
|
---|
| 7 | * modify it under the terms of the GNU Lesser General Public
|
---|
| 8 | * License as published by the Free Software Foundation; either
|
---|
| 9 | * version 2 of the License, or (at your option) any later version.
|
---|
| 10 | *
|
---|
| 11 | * This library is distributed in the hope that it will be useful,
|
---|
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
---|
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
---|
| 14 | * Lesser General Public License for more details.
|
---|
| 15 | *
|
---|
| 16 | * You should have received a copy of the GNU Lesser General Public
|
---|
| 17 | * License along with this library; if not, write to the Free Software
|
---|
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
---|
| 19 | */
|
---|
| 20 |
|
---|
| 21 | #include "tcc.h"
|
---|
| 22 |
|
---|
[331] | 23 | /* Define this to get some debug output during relocation processing. */
|
---|
| 24 | #undef DEBUG_RELOC
|
---|
| 25 |
|
---|
| 26 | /********************************************************/
|
---|
| 27 | /* global variables */
|
---|
| 28 |
|
---|
| 29 | ST_DATA Section *text_section, *data_section, *bss_section; /* predefined sections */
|
---|
| 30 | ST_DATA Section *common_section;
|
---|
| 31 | ST_DATA Section *cur_text_section; /* current section where function code is generated */
|
---|
| 32 | #ifdef CONFIG_TCC_ASM
|
---|
| 33 | ST_DATA Section *last_text_section; /* to handle .previous asm directive */
|
---|
| 34 | #endif
|
---|
| 35 | #ifdef CONFIG_TCC_BCHECK
|
---|
| 36 | /* bound check related sections */
|
---|
| 37 | ST_DATA Section *bounds_section; /* contains global data bound description */
|
---|
| 38 | ST_DATA Section *lbounds_section; /* contains local data bound description */
|
---|
| 39 | #endif
|
---|
| 40 | /* symbol sections */
|
---|
| 41 | ST_DATA Section *symtab_section;
|
---|
| 42 | /* debug sections */
|
---|
| 43 | ST_DATA Section *stab_section, *stabstr_section;
|
---|
| 44 |
|
---|
| 45 | /* XXX: avoid static variable */
|
---|
[279] | 46 | static int new_undef_sym = 0; /* Is there a new undefined sym since last new_undef_sym() */
|
---|
| 47 |
|
---|
[331] | 48 | /* special flag to indicate that the section should not be linked to the other ones */
|
---|
| 49 | #define SHF_PRIVATE 0x80000000
|
---|
| 50 | /* section is dynsymtab_section */
|
---|
| 51 | #define SHF_DYNSYM 0x40000000
|
---|
| 52 |
|
---|
| 53 | /* ------------------------------------------------------------------------- */
|
---|
| 54 |
|
---|
| 55 | ST_FUNC void tccelf_new(TCCState *s)
|
---|
| 56 | {
|
---|
| 57 | /* no section zero */
|
---|
| 58 | dynarray_add(&s->sections, &s->nb_sections, NULL);
|
---|
| 59 |
|
---|
| 60 | /* create standard sections */
|
---|
| 61 | text_section = new_section(s, ".text", SHT_PROGBITS, SHF_ALLOC | SHF_EXECINSTR);
|
---|
| 62 | data_section = new_section(s, ".data", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE);
|
---|
| 63 | bss_section = new_section(s, ".bss", SHT_NOBITS, SHF_ALLOC | SHF_WRITE);
|
---|
| 64 | common_section = new_section(s, ".common", SHT_NOBITS, SHF_PRIVATE);
|
---|
| 65 | common_section->sh_num = SHN_COMMON;
|
---|
| 66 |
|
---|
| 67 | /* symbols are always generated for linking stage */
|
---|
| 68 | symtab_section = new_symtab(s, ".symtab", SHT_SYMTAB, 0,
|
---|
| 69 | ".strtab",
|
---|
| 70 | ".hashtab", SHF_PRIVATE);
|
---|
| 71 | s->symtab = symtab_section;
|
---|
| 72 |
|
---|
| 73 | /* private symbol table for dynamic symbols */
|
---|
| 74 | s->dynsymtab_section = new_symtab(s, ".dynsymtab", SHT_SYMTAB, SHF_PRIVATE|SHF_DYNSYM,
|
---|
| 75 | ".dynstrtab",
|
---|
| 76 | ".dynhashtab", SHF_PRIVATE);
|
---|
| 77 | get_sym_attr(s, 0, 1);
|
---|
| 78 | }
|
---|
| 79 |
|
---|
| 80 | #ifdef CONFIG_TCC_BCHECK
|
---|
| 81 | ST_FUNC void tccelf_bounds_new(TCCState *s)
|
---|
| 82 | {
|
---|
| 83 | /* create bounds sections */
|
---|
| 84 | bounds_section = new_section(s, ".bounds",
|
---|
| 85 | SHT_PROGBITS, SHF_ALLOC);
|
---|
| 86 | lbounds_section = new_section(s, ".lbounds",
|
---|
| 87 | SHT_PROGBITS, SHF_ALLOC);
|
---|
| 88 | }
|
---|
| 89 | #endif
|
---|
| 90 |
|
---|
| 91 | ST_FUNC void tccelf_stab_new(TCCState *s)
|
---|
| 92 | {
|
---|
| 93 | stab_section = new_section(s, ".stab", SHT_PROGBITS, 0);
|
---|
| 94 | stab_section->sh_entsize = sizeof(Stab_Sym);
|
---|
| 95 | stabstr_section = new_section(s, ".stabstr", SHT_STRTAB, 0);
|
---|
| 96 | put_elf_str(stabstr_section, "");
|
---|
| 97 | stab_section->link = stabstr_section;
|
---|
| 98 | /* put first entry */
|
---|
| 99 | put_stabs("", 0, 0, 0, 0);
|
---|
| 100 | }
|
---|
| 101 |
|
---|
| 102 | static void free_section(Section *s)
|
---|
| 103 | {
|
---|
| 104 | tcc_free(s->data);
|
---|
| 105 | }
|
---|
| 106 |
|
---|
| 107 | ST_FUNC void tccelf_delete(TCCState *s1)
|
---|
| 108 | {
|
---|
| 109 | int i;
|
---|
| 110 |
|
---|
| 111 | /* free all sections */
|
---|
| 112 | for(i = 1; i < s1->nb_sections; i++)
|
---|
| 113 | free_section(s1->sections[i]);
|
---|
| 114 | dynarray_reset(&s1->sections, &s1->nb_sections);
|
---|
| 115 |
|
---|
| 116 | for(i = 0; i < s1->nb_priv_sections; i++)
|
---|
| 117 | free_section(s1->priv_sections[i]);
|
---|
| 118 | dynarray_reset(&s1->priv_sections, &s1->nb_priv_sections);
|
---|
| 119 |
|
---|
| 120 | /* free any loaded DLLs */
|
---|
| 121 | #ifdef TCC_IS_NATIVE
|
---|
| 122 | for ( i = 0; i < s1->nb_loaded_dlls; i++) {
|
---|
| 123 | DLLReference *ref = s1->loaded_dlls[i];
|
---|
| 124 | if ( ref->handle )
|
---|
| 125 | # ifdef _WIN32
|
---|
| 126 | FreeLibrary((HMODULE)ref->handle);
|
---|
| 127 | # else
|
---|
| 128 | dlclose(ref->handle);
|
---|
| 129 | # endif
|
---|
| 130 | }
|
---|
| 131 | #endif
|
---|
| 132 | /* free loaded dlls array */
|
---|
| 133 | dynarray_reset(&s1->loaded_dlls, &s1->nb_loaded_dlls);
|
---|
| 134 | tcc_free(s1->sym_attrs);
|
---|
| 135 |
|
---|
| 136 | symtab_section = NULL; /* for tccrun.c:rt_printline() */
|
---|
| 137 | }
|
---|
| 138 |
|
---|
| 139 | /* save section data state */
|
---|
| 140 | ST_FUNC void tccelf_begin_file(TCCState *s1)
|
---|
| 141 | {
|
---|
| 142 | Section *s; int i;
|
---|
| 143 | for (i = 1; i < s1->nb_sections; i++) {
|
---|
| 144 | s = s1->sections[i];
|
---|
| 145 | s->sh_offset = s->data_offset;
|
---|
| 146 | }
|
---|
| 147 | /* disable symbol hashing during compilation */
|
---|
| 148 | s = s1->symtab, s->reloc = s->hash, s->hash = NULL;
|
---|
| 149 | #if defined TCC_TARGET_X86_64 && defined TCC_TARGET_PE
|
---|
| 150 | s1->uw_sym = 0;
|
---|
| 151 | #endif
|
---|
| 152 | }
|
---|
| 153 |
|
---|
| 154 | /* At the end of compilation, convert any UNDEF syms to global, and merge
|
---|
| 155 | with previously existing symbols */
|
---|
| 156 | ST_FUNC void tccelf_end_file(TCCState *s1)
|
---|
| 157 | {
|
---|
| 158 | Section *s = s1->symtab;
|
---|
| 159 | int first_sym, nb_syms, *tr, i;
|
---|
| 160 |
|
---|
| 161 | first_sym = s->sh_offset / sizeof (ElfSym);
|
---|
| 162 | nb_syms = s->data_offset / sizeof (ElfSym) - first_sym;
|
---|
| 163 | s->data_offset = s->sh_offset;
|
---|
| 164 | s->link->data_offset = s->link->sh_offset;
|
---|
| 165 | s->hash = s->reloc, s->reloc = NULL;
|
---|
| 166 | tr = tcc_mallocz(nb_syms * sizeof *tr);
|
---|
| 167 |
|
---|
| 168 | for (i = 0; i < nb_syms; ++i) {
|
---|
| 169 | ElfSym *sym = (ElfSym*)s->data + first_sym + i;
|
---|
| 170 | if (sym->st_shndx == SHN_UNDEF
|
---|
| 171 | && ELFW(ST_BIND)(sym->st_info) == STB_LOCAL)
|
---|
| 172 | sym->st_info = ELFW(ST_INFO)(STB_GLOBAL, ELFW(ST_TYPE)(sym->st_info));
|
---|
| 173 | tr[i] = set_elf_sym(s, sym->st_value, sym->st_size, sym->st_info,
|
---|
| 174 | sym->st_other, sym->st_shndx, s->link->data + sym->st_name);
|
---|
| 175 | }
|
---|
| 176 | /* now update relocations */
|
---|
| 177 | for (i = 1; i < s1->nb_sections; i++) {
|
---|
| 178 | Section *sr = s1->sections[i];
|
---|
| 179 | if (sr->sh_type == SHT_RELX && sr->link == s) {
|
---|
| 180 | ElfW_Rel *rel = (ElfW_Rel*)(sr->data + sr->sh_offset);
|
---|
| 181 | ElfW_Rel *rel_end = (ElfW_Rel*)(sr->data + sr->data_offset);
|
---|
| 182 | for (; rel < rel_end; ++rel) {
|
---|
| 183 | int n = ELFW(R_SYM)(rel->r_info) - first_sym;
|
---|
| 184 | //if (n < 0) tcc_error("internal: invalid symbol index in relocation");
|
---|
| 185 | rel->r_info = ELFW(R_INFO)(tr[n], ELFW(R_TYPE)(rel->r_info));
|
---|
| 186 | }
|
---|
| 187 | }
|
---|
| 188 | }
|
---|
| 189 | tcc_free(tr);
|
---|
| 190 | }
|
---|
| 191 |
|
---|
| 192 | ST_FUNC Section *new_section(TCCState *s1, const char *name, int sh_type, int sh_flags)
|
---|
| 193 | {
|
---|
| 194 | Section *sec;
|
---|
| 195 |
|
---|
| 196 | sec = tcc_mallocz(sizeof(Section) + strlen(name));
|
---|
| 197 | strcpy(sec->name, name);
|
---|
| 198 | sec->sh_type = sh_type;
|
---|
| 199 | sec->sh_flags = sh_flags;
|
---|
| 200 | switch(sh_type) {
|
---|
| 201 | case SHT_HASH:
|
---|
| 202 | case SHT_REL:
|
---|
| 203 | case SHT_RELA:
|
---|
| 204 | case SHT_DYNSYM:
|
---|
| 205 | case SHT_SYMTAB:
|
---|
| 206 | case SHT_DYNAMIC:
|
---|
| 207 | sec->sh_addralign = 4;
|
---|
| 208 | break;
|
---|
| 209 | case SHT_STRTAB:
|
---|
| 210 | sec->sh_addralign = 1;
|
---|
| 211 | break;
|
---|
| 212 | default:
|
---|
| 213 | sec->sh_addralign = PTR_SIZE; /* gcc/pcc default alignment */
|
---|
| 214 | break;
|
---|
| 215 | }
|
---|
| 216 |
|
---|
| 217 | if (sh_flags & SHF_PRIVATE) {
|
---|
| 218 | dynarray_add(&s1->priv_sections, &s1->nb_priv_sections, sec);
|
---|
| 219 | } else {
|
---|
| 220 | sec->sh_num = s1->nb_sections;
|
---|
| 221 | dynarray_add(&s1->sections, &s1->nb_sections, sec);
|
---|
| 222 | }
|
---|
| 223 |
|
---|
| 224 | return sec;
|
---|
| 225 | }
|
---|
| 226 |
|
---|
| 227 | ST_FUNC Section *new_symtab(TCCState *s1,
|
---|
| 228 | const char *symtab_name, int sh_type, int sh_flags,
|
---|
| 229 | const char *strtab_name,
|
---|
| 230 | const char *hash_name, int hash_sh_flags)
|
---|
| 231 | {
|
---|
| 232 | Section *symtab, *strtab, *hash;
|
---|
| 233 | int *ptr, nb_buckets;
|
---|
| 234 |
|
---|
| 235 | symtab = new_section(s1, symtab_name, sh_type, sh_flags);
|
---|
| 236 | symtab->sh_entsize = sizeof(ElfW(Sym));
|
---|
| 237 | strtab = new_section(s1, strtab_name, SHT_STRTAB, sh_flags);
|
---|
| 238 | put_elf_str(strtab, "");
|
---|
| 239 | symtab->link = strtab;
|
---|
| 240 | put_elf_sym(symtab, 0, 0, 0, 0, 0, NULL);
|
---|
| 241 |
|
---|
| 242 | nb_buckets = 1;
|
---|
| 243 |
|
---|
| 244 | hash = new_section(s1, hash_name, SHT_HASH, hash_sh_flags);
|
---|
| 245 | hash->sh_entsize = sizeof(int);
|
---|
| 246 | symtab->hash = hash;
|
---|
| 247 | hash->link = symtab;
|
---|
| 248 |
|
---|
| 249 | ptr = section_ptr_add(hash, (2 + nb_buckets + 1) * sizeof(int));
|
---|
| 250 | ptr[0] = nb_buckets;
|
---|
| 251 | ptr[1] = 1;
|
---|
| 252 | memset(ptr + 2, 0, (nb_buckets + 1) * sizeof(int));
|
---|
| 253 | return symtab;
|
---|
| 254 | }
|
---|
| 255 |
|
---|
| 256 | /* realloc section and set its content to zero */
|
---|
| 257 | ST_FUNC void section_realloc(Section *sec, unsigned long new_size)
|
---|
| 258 | {
|
---|
| 259 | unsigned long size;
|
---|
| 260 | unsigned char *data;
|
---|
| 261 |
|
---|
| 262 | size = sec->data_allocated;
|
---|
| 263 | if (size == 0)
|
---|
| 264 | size = 1;
|
---|
| 265 | while (size < new_size)
|
---|
| 266 | size = size * 2;
|
---|
| 267 | data = tcc_realloc(sec->data, size);
|
---|
| 268 | memset(data + sec->data_allocated, 0, size - sec->data_allocated);
|
---|
| 269 | sec->data = data;
|
---|
| 270 | sec->data_allocated = size;
|
---|
| 271 | }
|
---|
| 272 |
|
---|
| 273 | /* reserve at least 'size' bytes aligned per 'align' in section
|
---|
| 274 | 'sec' from current offset, and return the aligned offset */
|
---|
| 275 | ST_FUNC size_t section_add(Section *sec, addr_t size, int align)
|
---|
| 276 | {
|
---|
| 277 | size_t offset, offset1;
|
---|
| 278 |
|
---|
| 279 | offset = (sec->data_offset + align - 1) & -align;
|
---|
| 280 | offset1 = offset + size;
|
---|
| 281 | if (sec->sh_type != SHT_NOBITS && offset1 > sec->data_allocated)
|
---|
| 282 | section_realloc(sec, offset1);
|
---|
| 283 | sec->data_offset = offset1;
|
---|
| 284 | if (align > sec->sh_addralign)
|
---|
| 285 | sec->sh_addralign = align;
|
---|
| 286 | return offset;
|
---|
| 287 | }
|
---|
| 288 |
|
---|
| 289 | /* reserve at least 'size' bytes in section 'sec' from
|
---|
| 290 | sec->data_offset. */
|
---|
| 291 | ST_FUNC void *section_ptr_add(Section *sec, addr_t size)
|
---|
| 292 | {
|
---|
| 293 | size_t offset = section_add(sec, size, 1);
|
---|
| 294 | return sec->data + offset;
|
---|
| 295 | }
|
---|
| 296 |
|
---|
| 297 | /* reserve at least 'size' bytes from section start */
|
---|
| 298 | ST_FUNC void section_reserve(Section *sec, unsigned long size)
|
---|
| 299 | {
|
---|
| 300 | if (size > sec->data_allocated)
|
---|
| 301 | section_realloc(sec, size);
|
---|
| 302 | if (size > sec->data_offset)
|
---|
| 303 | sec->data_offset = size;
|
---|
| 304 | }
|
---|
| 305 |
|
---|
| 306 | /* return a reference to a section, and create it if it does not
|
---|
| 307 | exists */
|
---|
| 308 | ST_FUNC Section *find_section(TCCState *s1, const char *name)
|
---|
| 309 | {
|
---|
| 310 | Section *sec;
|
---|
| 311 | int i;
|
---|
| 312 | for(i = 1; i < s1->nb_sections; i++) {
|
---|
| 313 | sec = s1->sections[i];
|
---|
| 314 | if (!strcmp(name, sec->name))
|
---|
| 315 | return sec;
|
---|
| 316 | }
|
---|
| 317 | /* sections are created as PROGBITS */
|
---|
| 318 | return new_section(s1, name, SHT_PROGBITS, SHF_ALLOC);
|
---|
| 319 | }
|
---|
| 320 |
|
---|
| 321 | /* ------------------------------------------------------------------------- */
|
---|
| 322 |
|
---|
[279] | 323 | ST_FUNC int put_elf_str(Section *s, const char *sym)
|
---|
| 324 | {
|
---|
| 325 | int offset, len;
|
---|
| 326 | char *ptr;
|
---|
| 327 |
|
---|
| 328 | len = strlen(sym) + 1;
|
---|
| 329 | offset = s->data_offset;
|
---|
| 330 | ptr = section_ptr_add(s, len);
|
---|
[331] | 331 | memmove(ptr, sym, len);
|
---|
[279] | 332 | return offset;
|
---|
| 333 | }
|
---|
| 334 |
|
---|
| 335 | /* elf symbol hashing function */
|
---|
| 336 | static unsigned long elf_hash(const unsigned char *name)
|
---|
| 337 | {
|
---|
| 338 | unsigned long h = 0, g;
|
---|
[331] | 339 |
|
---|
[279] | 340 | while (*name) {
|
---|
| 341 | h = (h << 4) + *name++;
|
---|
| 342 | g = h & 0xf0000000;
|
---|
| 343 | if (g)
|
---|
| 344 | h ^= g >> 24;
|
---|
| 345 | h &= ~g;
|
---|
| 346 | }
|
---|
| 347 | return h;
|
---|
| 348 | }
|
---|
| 349 |
|
---|
| 350 | /* rebuild hash table of section s */
|
---|
| 351 | /* NOTE: we do factorize the hash table code to go faster */
|
---|
| 352 | static void rebuild_hash(Section *s, unsigned int nb_buckets)
|
---|
| 353 | {
|
---|
| 354 | ElfW(Sym) *sym;
|
---|
| 355 | int *ptr, *hash, nb_syms, sym_index, h;
|
---|
[331] | 356 | unsigned char *strtab;
|
---|
[279] | 357 |
|
---|
| 358 | strtab = s->link->data;
|
---|
| 359 | nb_syms = s->data_offset / sizeof(ElfW(Sym));
|
---|
| 360 |
|
---|
[331] | 361 | if (!nb_buckets)
|
---|
| 362 | nb_buckets = ((int*)s->hash->data)[0];
|
---|
| 363 |
|
---|
[279] | 364 | s->hash->data_offset = 0;
|
---|
| 365 | ptr = section_ptr_add(s->hash, (2 + nb_buckets + nb_syms) * sizeof(int));
|
---|
| 366 | ptr[0] = nb_buckets;
|
---|
| 367 | ptr[1] = nb_syms;
|
---|
| 368 | ptr += 2;
|
---|
| 369 | hash = ptr;
|
---|
| 370 | memset(hash, 0, (nb_buckets + 1) * sizeof(int));
|
---|
| 371 | ptr += nb_buckets + 1;
|
---|
| 372 |
|
---|
| 373 | sym = (ElfW(Sym) *)s->data + 1;
|
---|
| 374 | for(sym_index = 1; sym_index < nb_syms; sym_index++) {
|
---|
| 375 | if (ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) {
|
---|
| 376 | h = elf_hash(strtab + sym->st_name) % nb_buckets;
|
---|
| 377 | *ptr = hash[h];
|
---|
| 378 | hash[h] = sym_index;
|
---|
| 379 | } else {
|
---|
| 380 | *ptr = 0;
|
---|
| 381 | }
|
---|
| 382 | ptr++;
|
---|
| 383 | sym++;
|
---|
| 384 | }
|
---|
| 385 | }
|
---|
| 386 |
|
---|
| 387 | /* return the symbol number */
|
---|
| 388 | ST_FUNC int put_elf_sym(Section *s, addr_t value, unsigned long size,
|
---|
| 389 | int info, int other, int shndx, const char *name)
|
---|
| 390 | {
|
---|
| 391 | int name_offset, sym_index;
|
---|
| 392 | int nbuckets, h;
|
---|
| 393 | ElfW(Sym) *sym;
|
---|
| 394 | Section *hs;
|
---|
[331] | 395 |
|
---|
[279] | 396 | sym = section_ptr_add(s, sizeof(ElfW(Sym)));
|
---|
[331] | 397 | if (name && name[0])
|
---|
[279] | 398 | name_offset = put_elf_str(s->link, name);
|
---|
| 399 | else
|
---|
| 400 | name_offset = 0;
|
---|
| 401 | /* XXX: endianness */
|
---|
| 402 | sym->st_name = name_offset;
|
---|
| 403 | sym->st_value = value;
|
---|
| 404 | sym->st_size = size;
|
---|
| 405 | sym->st_info = info;
|
---|
| 406 | sym->st_other = other;
|
---|
| 407 | sym->st_shndx = shndx;
|
---|
| 408 | sym_index = sym - (ElfW(Sym) *)s->data;
|
---|
| 409 | hs = s->hash;
|
---|
| 410 | if (hs) {
|
---|
| 411 | int *ptr, *base;
|
---|
| 412 | ptr = section_ptr_add(hs, sizeof(int));
|
---|
| 413 | base = (int *)hs->data;
|
---|
[331] | 414 | /* only add global or weak symbols. */
|
---|
[279] | 415 | if (ELFW(ST_BIND)(info) != STB_LOCAL) {
|
---|
| 416 | /* add another hashing entry */
|
---|
| 417 | nbuckets = base[0];
|
---|
[331] | 418 | h = elf_hash((unsigned char *)s->link->data + name_offset) % nbuckets;
|
---|
[279] | 419 | *ptr = base[2 + h];
|
---|
| 420 | base[2 + h] = sym_index;
|
---|
| 421 | base[1]++;
|
---|
| 422 | /* we resize the hash table */
|
---|
| 423 | hs->nb_hashed_syms++;
|
---|
| 424 | if (hs->nb_hashed_syms > 2 * nbuckets) {
|
---|
| 425 | rebuild_hash(s, 2 * nbuckets);
|
---|
| 426 | }
|
---|
| 427 | } else {
|
---|
| 428 | *ptr = 0;
|
---|
| 429 | base[1]++;
|
---|
| 430 | }
|
---|
| 431 | }
|
---|
| 432 | return sym_index;
|
---|
| 433 | }
|
---|
| 434 |
|
---|
| 435 | ST_FUNC int find_elf_sym(Section *s, const char *name)
|
---|
| 436 | {
|
---|
| 437 | ElfW(Sym) *sym;
|
---|
| 438 | Section *hs;
|
---|
| 439 | int nbuckets, sym_index, h;
|
---|
| 440 | const char *name1;
|
---|
[331] | 441 |
|
---|
[279] | 442 | hs = s->hash;
|
---|
| 443 | if (!hs)
|
---|
| 444 | return 0;
|
---|
| 445 | nbuckets = ((int *)hs->data)[0];
|
---|
[331] | 446 | h = elf_hash((unsigned char *) name) % nbuckets;
|
---|
[279] | 447 | sym_index = ((int *)hs->data)[2 + h];
|
---|
| 448 | while (sym_index != 0) {
|
---|
| 449 | sym = &((ElfW(Sym) *)s->data)[sym_index];
|
---|
[331] | 450 | name1 = (char *) s->link->data + sym->st_name;
|
---|
[279] | 451 | if (!strcmp(name, name1))
|
---|
| 452 | return sym_index;
|
---|
| 453 | sym_index = ((int *)hs->data)[2 + nbuckets + sym_index];
|
---|
| 454 | }
|
---|
| 455 | return 0;
|
---|
| 456 | }
|
---|
| 457 |
|
---|
| 458 | /* return elf symbol value, signal error if 'err' is nonzero */
|
---|
| 459 | ST_FUNC addr_t get_elf_sym_addr(TCCState *s, const char *name, int err)
|
---|
| 460 | {
|
---|
| 461 | int sym_index;
|
---|
| 462 | ElfW(Sym) *sym;
|
---|
| 463 |
|
---|
| 464 | sym_index = find_elf_sym(s->symtab, name);
|
---|
| 465 | sym = &((ElfW(Sym) *)s->symtab->data)[sym_index];
|
---|
| 466 | if (!sym_index || sym->st_shndx == SHN_UNDEF) {
|
---|
| 467 | if (err)
|
---|
| 468 | tcc_error("%s not defined", name);
|
---|
| 469 | return 0;
|
---|
| 470 | }
|
---|
| 471 | return sym->st_value;
|
---|
| 472 | }
|
---|
| 473 |
|
---|
| 474 | /* return elf symbol value */
|
---|
| 475 | LIBTCCAPI void *tcc_get_symbol(TCCState *s, const char *name)
|
---|
| 476 | {
|
---|
| 477 | return (void*)(uintptr_t)get_elf_sym_addr(s, name, 0);
|
---|
| 478 | }
|
---|
| 479 |
|
---|
[331] | 480 | #if defined TCC_IS_NATIVE || defined TCC_TARGET_PE
|
---|
[279] | 481 | /* return elf symbol value or error */
|
---|
| 482 | ST_FUNC void* tcc_get_symbol_err(TCCState *s, const char *name)
|
---|
| 483 | {
|
---|
[331] | 484 | return (void*)(uintptr_t)get_elf_sym_addr(s, name, 1);
|
---|
[279] | 485 | }
|
---|
| 486 | #endif
|
---|
| 487 |
|
---|
| 488 | /* add an elf symbol : check if it is already defined and patch
|
---|
| 489 | it. Return symbol index. NOTE that sh_num can be SHN_UNDEF. */
|
---|
[331] | 490 | ST_FUNC int set_elf_sym(Section *s, addr_t value, unsigned long size,
|
---|
| 491 | int info, int other, int shndx, const char *name)
|
---|
[279] | 492 | {
|
---|
| 493 | ElfW(Sym) *esym;
|
---|
| 494 | int sym_bind, sym_index, sym_type, esym_bind;
|
---|
| 495 | unsigned char sym_vis, esym_vis, new_vis;
|
---|
| 496 |
|
---|
| 497 | sym_bind = ELFW(ST_BIND)(info);
|
---|
| 498 | sym_type = ELFW(ST_TYPE)(info);
|
---|
| 499 | sym_vis = ELFW(ST_VISIBILITY)(other);
|
---|
[331] | 500 |
|
---|
[279] | 501 | if (sym_bind != STB_LOCAL) {
|
---|
| 502 | /* we search global or weak symbols */
|
---|
| 503 | sym_index = find_elf_sym(s, name);
|
---|
| 504 | if (!sym_index)
|
---|
| 505 | goto do_def;
|
---|
| 506 | esym = &((ElfW(Sym) *)s->data)[sym_index];
|
---|
[331] | 507 | if (esym->st_value == value && esym->st_size == size && esym->st_info == info
|
---|
| 508 | && esym->st_other == other && esym->st_shndx == shndx)
|
---|
| 509 | return sym_index;
|
---|
[279] | 510 | if (esym->st_shndx != SHN_UNDEF) {
|
---|
| 511 | esym_bind = ELFW(ST_BIND)(esym->st_info);
|
---|
| 512 | /* propagate the most constraining visibility */
|
---|
| 513 | /* STV_DEFAULT(0)<STV_PROTECTED(3)<STV_HIDDEN(2)<STV_INTERNAL(1) */
|
---|
| 514 | esym_vis = ELFW(ST_VISIBILITY)(esym->st_other);
|
---|
| 515 | if (esym_vis == STV_DEFAULT) {
|
---|
| 516 | new_vis = sym_vis;
|
---|
| 517 | } else if (sym_vis == STV_DEFAULT) {
|
---|
| 518 | new_vis = esym_vis;
|
---|
| 519 | } else {
|
---|
| 520 | new_vis = (esym_vis < sym_vis) ? esym_vis : sym_vis;
|
---|
| 521 | }
|
---|
| 522 | esym->st_other = (esym->st_other & ~ELFW(ST_VISIBILITY)(-1))
|
---|
| 523 | | new_vis;
|
---|
| 524 | other = esym->st_other; /* in case we have to patch esym */
|
---|
[331] | 525 | if (shndx == SHN_UNDEF) {
|
---|
[279] | 526 | /* ignore adding of undefined symbol if the
|
---|
| 527 | corresponding symbol is already defined */
|
---|
| 528 | } else if (sym_bind == STB_GLOBAL && esym_bind == STB_WEAK) {
|
---|
| 529 | /* global overrides weak, so patch */
|
---|
| 530 | goto do_patch;
|
---|
| 531 | } else if (sym_bind == STB_WEAK && esym_bind == STB_GLOBAL) {
|
---|
| 532 | /* weak is ignored if already global */
|
---|
| 533 | } else if (sym_bind == STB_WEAK && esym_bind == STB_WEAK) {
|
---|
| 534 | /* keep first-found weak definition, ignore subsequents */
|
---|
| 535 | } else if (sym_vis == STV_HIDDEN || sym_vis == STV_INTERNAL) {
|
---|
| 536 | /* ignore hidden symbols after */
|
---|
[331] | 537 | } else if ((esym->st_shndx == SHN_COMMON
|
---|
| 538 | || esym->st_shndx == bss_section->sh_num)
|
---|
| 539 | && (shndx < SHN_LORESERVE
|
---|
| 540 | && shndx != bss_section->sh_num)) {
|
---|
| 541 | /* data symbol gets precedence over common/bss */
|
---|
[279] | 542 | goto do_patch;
|
---|
[331] | 543 | } else if (shndx == SHN_COMMON || shndx == bss_section->sh_num) {
|
---|
| 544 | /* data symbol keeps precedence over common/bss */
|
---|
| 545 | } else if (s->sh_flags & SHF_DYNSYM) {
|
---|
[279] | 546 | /* we accept that two DLL define the same symbol */
|
---|
[331] | 547 | } else if (esym->st_other & ST_ASM_SET) {
|
---|
| 548 | /* If the existing symbol came from an asm .set
|
---|
| 549 | we can override. */
|
---|
| 550 | goto do_patch;
|
---|
[279] | 551 | } else {
|
---|
| 552 | #if 0
|
---|
| 553 | printf("new_bind=%x new_shndx=%x new_vis=%x old_bind=%x old_shndx=%x old_vis=%x\n",
|
---|
[331] | 554 | sym_bind, shndx, new_vis, esym_bind, esym->st_shndx, esym_vis);
|
---|
[279] | 555 | #endif
|
---|
| 556 | tcc_error_noabort("'%s' defined twice", name);
|
---|
| 557 | }
|
---|
| 558 | } else {
|
---|
| 559 | do_patch:
|
---|
| 560 | esym->st_info = ELFW(ST_INFO)(sym_bind, sym_type);
|
---|
[331] | 561 | esym->st_shndx = shndx;
|
---|
[279] | 562 | new_undef_sym = 1;
|
---|
| 563 | esym->st_value = value;
|
---|
| 564 | esym->st_size = size;
|
---|
| 565 | esym->st_other = other;
|
---|
| 566 | }
|
---|
| 567 | } else {
|
---|
| 568 | do_def:
|
---|
[331] | 569 | sym_index = put_elf_sym(s, value, size,
|
---|
| 570 | ELFW(ST_INFO)(sym_bind, sym_type), other,
|
---|
| 571 | shndx, name);
|
---|
[279] | 572 | }
|
---|
| 573 | return sym_index;
|
---|
| 574 | }
|
---|
| 575 |
|
---|
| 576 | /* put relocation */
|
---|
[331] | 577 | ST_FUNC void put_elf_reloca(Section *symtab, Section *s, unsigned long offset,
|
---|
| 578 | int type, int symbol, addr_t addend)
|
---|
[279] | 579 | {
|
---|
| 580 | char buf[256];
|
---|
| 581 | Section *sr;
|
---|
| 582 | ElfW_Rel *rel;
|
---|
| 583 |
|
---|
| 584 | sr = s->reloc;
|
---|
| 585 | if (!sr) {
|
---|
| 586 | /* if no relocation section, create it */
|
---|
| 587 | snprintf(buf, sizeof(buf), REL_SECTION_FMT, s->name);
|
---|
| 588 | /* if the symtab is allocated, then we consider the relocation
|
---|
| 589 | are also */
|
---|
| 590 | sr = new_section(tcc_state, buf, SHT_RELX, symtab->sh_flags);
|
---|
| 591 | sr->sh_entsize = sizeof(ElfW_Rel);
|
---|
| 592 | sr->link = symtab;
|
---|
| 593 | sr->sh_info = s->sh_num;
|
---|
| 594 | s->reloc = sr;
|
---|
| 595 | }
|
---|
| 596 | rel = section_ptr_add(sr, sizeof(ElfW_Rel));
|
---|
| 597 | rel->r_offset = offset;
|
---|
| 598 | rel->r_info = ELFW(R_INFO)(symbol, type);
|
---|
[331] | 599 | #if SHT_RELX == SHT_RELA
|
---|
| 600 | rel->r_addend = addend;
|
---|
| 601 | #else
|
---|
| 602 | if (addend)
|
---|
| 603 | tcc_error("non-zero addend on REL architecture");
|
---|
[279] | 604 | #endif
|
---|
| 605 | }
|
---|
| 606 |
|
---|
[331] | 607 | ST_FUNC void put_elf_reloc(Section *symtab, Section *s, unsigned long offset,
|
---|
| 608 | int type, int symbol)
|
---|
| 609 | {
|
---|
| 610 | put_elf_reloca(symtab, s, offset, type, symbol, 0);
|
---|
| 611 | }
|
---|
| 612 |
|
---|
| 613 | /* Remove relocations for section S->reloc starting at oldrelocoffset
|
---|
| 614 | that are to the same place, retaining the last of them. As side effect
|
---|
| 615 | the relocations are sorted. Possibly reduces the number of relocs. */
|
---|
| 616 | ST_FUNC void squeeze_multi_relocs(Section *s, size_t oldrelocoffset)
|
---|
| 617 | {
|
---|
| 618 | Section *sr = s->reloc;
|
---|
| 619 | ElfW_Rel *r, *dest;
|
---|
| 620 | ssize_t a;
|
---|
| 621 | ElfW(Addr) addr;
|
---|
| 622 |
|
---|
| 623 | if (oldrelocoffset + sizeof(*r) >= sr->data_offset)
|
---|
| 624 | return;
|
---|
| 625 | /* The relocs we're dealing with are the result of initializer parsing.
|
---|
| 626 | So they will be mostly in order and there aren't many of them.
|
---|
| 627 | Secondly we need a stable sort (which qsort isn't). We use
|
---|
| 628 | a simple insertion sort. */
|
---|
| 629 | for (a = oldrelocoffset + sizeof(*r); a < sr->data_offset; a += sizeof(*r)) {
|
---|
| 630 | ssize_t i = a - sizeof(*r);
|
---|
| 631 | addr = ((ElfW_Rel*)(sr->data + a))->r_offset;
|
---|
| 632 | for (; i >= (ssize_t)oldrelocoffset &&
|
---|
| 633 | ((ElfW_Rel*)(sr->data + i))->r_offset > addr; i -= sizeof(*r)) {
|
---|
| 634 | ElfW_Rel tmp = *(ElfW_Rel*)(sr->data + a);
|
---|
| 635 | *(ElfW_Rel*)(sr->data + a) = *(ElfW_Rel*)(sr->data + i);
|
---|
| 636 | *(ElfW_Rel*)(sr->data + i) = tmp;
|
---|
| 637 | }
|
---|
| 638 | }
|
---|
| 639 |
|
---|
| 640 | r = (ElfW_Rel*)(sr->data + oldrelocoffset);
|
---|
| 641 | dest = r;
|
---|
| 642 | for (; r < (ElfW_Rel*)(sr->data + sr->data_offset); r++) {
|
---|
| 643 | if (dest->r_offset != r->r_offset)
|
---|
| 644 | dest++;
|
---|
| 645 | *dest = *r;
|
---|
| 646 | }
|
---|
| 647 | sr->data_offset = (unsigned char*)dest - sr->data + sizeof(*r);
|
---|
| 648 | }
|
---|
| 649 |
|
---|
[279] | 650 | /* put stab debug information */
|
---|
| 651 |
|
---|
| 652 | ST_FUNC void put_stabs(const char *str, int type, int other, int desc,
|
---|
| 653 | unsigned long value)
|
---|
| 654 | {
|
---|
| 655 | Stab_Sym *sym;
|
---|
| 656 |
|
---|
| 657 | sym = section_ptr_add(stab_section, sizeof(Stab_Sym));
|
---|
| 658 | if (str) {
|
---|
| 659 | sym->n_strx = put_elf_str(stabstr_section, str);
|
---|
| 660 | } else {
|
---|
| 661 | sym->n_strx = 0;
|
---|
| 662 | }
|
---|
| 663 | sym->n_type = type;
|
---|
| 664 | sym->n_other = other;
|
---|
| 665 | sym->n_desc = desc;
|
---|
| 666 | sym->n_value = value;
|
---|
| 667 | }
|
---|
| 668 |
|
---|
[331] | 669 | ST_FUNC void put_stabs_r(const char *str, int type, int other, int desc,
|
---|
[279] | 670 | unsigned long value, Section *sec, int sym_index)
|
---|
| 671 | {
|
---|
| 672 | put_stabs(str, type, other, desc, value);
|
---|
[331] | 673 | put_elf_reloc(symtab_section, stab_section,
|
---|
[279] | 674 | stab_section->data_offset - sizeof(unsigned int),
|
---|
| 675 | R_DATA_32, sym_index);
|
---|
| 676 | }
|
---|
| 677 |
|
---|
| 678 | ST_FUNC void put_stabn(int type, int other, int desc, int value)
|
---|
| 679 | {
|
---|
| 680 | put_stabs(NULL, type, other, desc, value);
|
---|
| 681 | }
|
---|
| 682 |
|
---|
| 683 | ST_FUNC void put_stabd(int type, int other, int desc)
|
---|
| 684 | {
|
---|
| 685 | put_stabs(NULL, type, other, desc, 0);
|
---|
| 686 | }
|
---|
| 687 |
|
---|
[331] | 688 | ST_FUNC struct sym_attr *get_sym_attr(TCCState *s1, int index, int alloc)
|
---|
| 689 | {
|
---|
| 690 | int n;
|
---|
| 691 | struct sym_attr *tab;
|
---|
| 692 |
|
---|
| 693 | if (index >= s1->nb_sym_attrs) {
|
---|
| 694 | if (!alloc)
|
---|
| 695 | return s1->sym_attrs;
|
---|
| 696 | /* find immediately bigger power of 2 and reallocate array */
|
---|
| 697 | n = 1;
|
---|
| 698 | while (index >= n)
|
---|
| 699 | n *= 2;
|
---|
| 700 | tab = tcc_realloc(s1->sym_attrs, n * sizeof(*s1->sym_attrs));
|
---|
| 701 | s1->sym_attrs = tab;
|
---|
| 702 | memset(s1->sym_attrs + s1->nb_sym_attrs, 0,
|
---|
| 703 | (n - s1->nb_sym_attrs) * sizeof(*s1->sym_attrs));
|
---|
| 704 | s1->nb_sym_attrs = n;
|
---|
| 705 | }
|
---|
| 706 | return &s1->sym_attrs[index];
|
---|
| 707 | }
|
---|
| 708 |
|
---|
| 709 | /* Browse each elem of type <type> in section <sec> starting at elem <startoff>
|
---|
| 710 | using variable <elem> */
|
---|
| 711 | #define for_each_elem(sec, startoff, elem, type) \
|
---|
| 712 | for (elem = (type *) sec->data + startoff; \
|
---|
| 713 | elem < (type *) (sec->data + sec->data_offset); elem++)
|
---|
| 714 |
|
---|
[279] | 715 | /* In an ELF file symbol table, the local symbols must appear below
|
---|
| 716 | the global and weak ones. Since TCC cannot sort it while generating
|
---|
| 717 | the code, we must do it after. All the relocation tables are also
|
---|
| 718 | modified to take into account the symbol table sorting */
|
---|
| 719 | static void sort_syms(TCCState *s1, Section *s)
|
---|
| 720 | {
|
---|
| 721 | int *old_to_new_syms;
|
---|
| 722 | ElfW(Sym) *new_syms;
|
---|
| 723 | int nb_syms, i;
|
---|
| 724 | ElfW(Sym) *p, *q;
|
---|
[331] | 725 | ElfW_Rel *rel;
|
---|
[279] | 726 | Section *sr;
|
---|
| 727 | int type, sym_index;
|
---|
| 728 |
|
---|
| 729 | nb_syms = s->data_offset / sizeof(ElfW(Sym));
|
---|
| 730 | new_syms = tcc_malloc(nb_syms * sizeof(ElfW(Sym)));
|
---|
| 731 | old_to_new_syms = tcc_malloc(nb_syms * sizeof(int));
|
---|
| 732 |
|
---|
| 733 | /* first pass for local symbols */
|
---|
| 734 | p = (ElfW(Sym) *)s->data;
|
---|
| 735 | q = new_syms;
|
---|
| 736 | for(i = 0; i < nb_syms; i++) {
|
---|
| 737 | if (ELFW(ST_BIND)(p->st_info) == STB_LOCAL) {
|
---|
| 738 | old_to_new_syms[i] = q - new_syms;
|
---|
| 739 | *q++ = *p;
|
---|
| 740 | }
|
---|
| 741 | p++;
|
---|
| 742 | }
|
---|
| 743 | /* save the number of local symbols in section header */
|
---|
[331] | 744 | if( s->sh_size ) /* this 'if' makes IDA happy */
|
---|
| 745 | s->sh_info = q - new_syms;
|
---|
[279] | 746 |
|
---|
| 747 | /* then second pass for non local symbols */
|
---|
| 748 | p = (ElfW(Sym) *)s->data;
|
---|
| 749 | for(i = 0; i < nb_syms; i++) {
|
---|
| 750 | if (ELFW(ST_BIND)(p->st_info) != STB_LOCAL) {
|
---|
| 751 | old_to_new_syms[i] = q - new_syms;
|
---|
| 752 | *q++ = *p;
|
---|
| 753 | }
|
---|
| 754 | p++;
|
---|
| 755 | }
|
---|
[331] | 756 |
|
---|
[279] | 757 | /* we copy the new symbols to the old */
|
---|
| 758 | memcpy(s->data, new_syms, nb_syms * sizeof(ElfW(Sym)));
|
---|
| 759 | tcc_free(new_syms);
|
---|
| 760 |
|
---|
| 761 | /* now we modify all the relocations */
|
---|
| 762 | for(i = 1; i < s1->nb_sections; i++) {
|
---|
| 763 | sr = s1->sections[i];
|
---|
| 764 | if (sr->sh_type == SHT_RELX && sr->link == s) {
|
---|
[331] | 765 | for_each_elem(sr, 0, rel, ElfW_Rel) {
|
---|
[279] | 766 | sym_index = ELFW(R_SYM)(rel->r_info);
|
---|
| 767 | type = ELFW(R_TYPE)(rel->r_info);
|
---|
| 768 | sym_index = old_to_new_syms[sym_index];
|
---|
| 769 | rel->r_info = ELFW(R_INFO)(sym_index, type);
|
---|
| 770 | }
|
---|
| 771 | }
|
---|
| 772 | }
|
---|
[331] | 773 |
|
---|
[279] | 774 | tcc_free(old_to_new_syms);
|
---|
| 775 | }
|
---|
| 776 |
|
---|
| 777 | /* relocate symbol table, resolve undefined symbols if do_resolve is
|
---|
| 778 | true and output error if undefined symbol. */
|
---|
[331] | 779 | ST_FUNC void relocate_syms(TCCState *s1, Section *symtab, int do_resolve)
|
---|
[279] | 780 | {
|
---|
[331] | 781 | ElfW(Sym) *sym;
|
---|
| 782 | int sym_bind, sh_num;
|
---|
[279] | 783 | const char *name;
|
---|
| 784 |
|
---|
[331] | 785 | for_each_elem(symtab, 1, sym, ElfW(Sym)) {
|
---|
[279] | 786 | sh_num = sym->st_shndx;
|
---|
| 787 | if (sh_num == SHN_UNDEF) {
|
---|
[331] | 788 | name = (char *) s1->symtab->link->data + sym->st_name;
|
---|
| 789 | /* Use ld.so to resolve symbol for us (for tcc -run) */
|
---|
[279] | 790 | if (do_resolve) {
|
---|
[331] | 791 | #if defined TCC_IS_NATIVE && !defined TCC_TARGET_PE
|
---|
| 792 | void *addr = dlsym(RTLD_DEFAULT, name);
|
---|
[279] | 793 | if (addr) {
|
---|
[331] | 794 | sym->st_value = (addr_t) addr;
|
---|
| 795 | #ifdef DEBUG_RELOC
|
---|
| 796 | printf ("relocate_sym: %s -> 0x%lx\n", name, sym->st_value);
|
---|
| 797 | #endif
|
---|
[279] | 798 | goto found;
|
---|
| 799 | }
|
---|
| 800 | #endif
|
---|
[331] | 801 | /* if dynamic symbol exist, it will be used in relocate_section */
|
---|
| 802 | } else if (s1->dynsym && find_elf_sym(s1->dynsym, name))
|
---|
| 803 | goto found;
|
---|
[279] | 804 | /* XXX: _fp_hw seems to be part of the ABI, so we ignore
|
---|
| 805 | it */
|
---|
| 806 | if (!strcmp(name, "_fp_hw"))
|
---|
| 807 | goto found;
|
---|
| 808 | /* only weak symbols are accepted to be undefined. Their
|
---|
| 809 | value is zero */
|
---|
| 810 | sym_bind = ELFW(ST_BIND)(sym->st_info);
|
---|
[331] | 811 | if (sym_bind == STB_WEAK)
|
---|
[279] | 812 | sym->st_value = 0;
|
---|
[331] | 813 | else
|
---|
[279] | 814 | tcc_error_noabort("undefined symbol '%s'", name);
|
---|
| 815 | } else if (sh_num < SHN_LORESERVE) {
|
---|
| 816 | /* add section base */
|
---|
| 817 | sym->st_value += s1->sections[sym->st_shndx]->sh_addr;
|
---|
| 818 | }
|
---|
| 819 | found: ;
|
---|
| 820 | }
|
---|
| 821 | }
|
---|
| 822 |
|
---|
[331] | 823 | /* relocate a given section (CPU dependent) by applying the relocations
|
---|
| 824 | in the associated relocation section */
|
---|
[279] | 825 | ST_FUNC void relocate_section(TCCState *s1, Section *s)
|
---|
| 826 | {
|
---|
[331] | 827 | Section *sr = s->reloc;
|
---|
| 828 | ElfW_Rel *rel;
|
---|
[279] | 829 | ElfW(Sym) *sym;
|
---|
| 830 | int type, sym_index;
|
---|
| 831 | unsigned char *ptr;
|
---|
[331] | 832 | addr_t tgt, addr;
|
---|
[279] | 833 |
|
---|
[331] | 834 | relocate_init(sr);
|
---|
| 835 |
|
---|
| 836 | for_each_elem(sr, 0, rel, ElfW_Rel) {
|
---|
[279] | 837 | ptr = s->data + rel->r_offset;
|
---|
| 838 | sym_index = ELFW(R_SYM)(rel->r_info);
|
---|
| 839 | sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
|
---|
[331] | 840 | type = ELFW(R_TYPE)(rel->r_info);
|
---|
| 841 | tgt = sym->st_value;
|
---|
| 842 | #if SHT_RELX == SHT_RELA
|
---|
| 843 | tgt += rel->r_addend;
|
---|
[279] | 844 | #endif
|
---|
| 845 | addr = s->sh_addr + rel->r_offset;
|
---|
[331] | 846 | relocate(s1, rel, type, ptr, addr, tgt);
|
---|
[279] | 847 | }
|
---|
| 848 | /* if the relocation is allocated, we change its symbol table */
|
---|
| 849 | if (sr->sh_flags & SHF_ALLOC)
|
---|
| 850 | sr->link = s1->dynsym;
|
---|
| 851 | }
|
---|
| 852 |
|
---|
| 853 | /* relocate relocation table in 'sr' */
|
---|
| 854 | static void relocate_rel(TCCState *s1, Section *sr)
|
---|
| 855 | {
|
---|
| 856 | Section *s;
|
---|
[331] | 857 | ElfW_Rel *rel;
|
---|
| 858 |
|
---|
[279] | 859 | s = s1->sections[sr->sh_info];
|
---|
[331] | 860 | for_each_elem(sr, 0, rel, ElfW_Rel)
|
---|
[279] | 861 | rel->r_offset += s->sh_addr;
|
---|
| 862 | }
|
---|
| 863 |
|
---|
| 864 | /* count the number of dynamic relocations so that we can reserve
|
---|
| 865 | their space */
|
---|
| 866 | static int prepare_dynamic_rel(TCCState *s1, Section *sr)
|
---|
| 867 | {
|
---|
[331] | 868 | ElfW_Rel *rel;
|
---|
| 869 | int sym_index, type, count;
|
---|
[279] | 870 |
|
---|
| 871 | count = 0;
|
---|
[331] | 872 | for_each_elem(sr, 0, rel, ElfW_Rel) {
|
---|
[279] | 873 | sym_index = ELFW(R_SYM)(rel->r_info);
|
---|
| 874 | type = ELFW(R_TYPE)(rel->r_info);
|
---|
| 875 | switch(type) {
|
---|
| 876 | #if defined(TCC_TARGET_I386)
|
---|
| 877 | case R_386_32:
|
---|
[331] | 878 | if (!get_sym_attr(s1, sym_index, 0)->dyn_index
|
---|
| 879 | && ((ElfW(Sym)*)symtab_section->data + sym_index)->st_shndx == SHN_UNDEF) {
|
---|
| 880 | /* don't fixup unresolved (weak) symbols */
|
---|
| 881 | rel->r_info = ELFW(R_INFO)(sym_index, R_386_RELATIVE);
|
---|
| 882 | break;
|
---|
| 883 | }
|
---|
[279] | 884 | #elif defined(TCC_TARGET_X86_64)
|
---|
| 885 | case R_X86_64_32:
|
---|
| 886 | case R_X86_64_32S:
|
---|
| 887 | case R_X86_64_64:
|
---|
| 888 | #endif
|
---|
| 889 | count++;
|
---|
| 890 | break;
|
---|
| 891 | #if defined(TCC_TARGET_I386)
|
---|
| 892 | case R_386_PC32:
|
---|
| 893 | #elif defined(TCC_TARGET_X86_64)
|
---|
| 894 | case R_X86_64_PC32:
|
---|
| 895 | #endif
|
---|
[331] | 896 | if (get_sym_attr(s1, sym_index, 0)->dyn_index)
|
---|
[279] | 897 | count++;
|
---|
| 898 | break;
|
---|
| 899 | default:
|
---|
| 900 | break;
|
---|
| 901 | }
|
---|
| 902 | }
|
---|
| 903 | if (count) {
|
---|
| 904 | /* allocate the section */
|
---|
| 905 | sr->sh_flags |= SHF_ALLOC;
|
---|
| 906 | sr->sh_size = count * sizeof(ElfW_Rel);
|
---|
| 907 | }
|
---|
| 908 | return count;
|
---|
| 909 | }
|
---|
| 910 |
|
---|
| 911 | static void build_got(TCCState *s1)
|
---|
| 912 | {
|
---|
| 913 | /* if no got, then create it */
|
---|
| 914 | s1->got = new_section(s1, ".got", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE);
|
---|
| 915 | s1->got->sh_entsize = 4;
|
---|
[331] | 916 | set_elf_sym(symtab_section, 0, 4, ELFW(ST_INFO)(STB_GLOBAL, STT_OBJECT),
|
---|
[279] | 917 | 0, s1->got->sh_num, "_GLOBAL_OFFSET_TABLE_");
|
---|
[331] | 918 | /* keep space for _DYNAMIC pointer and two dummy got entries */
|
---|
| 919 | section_ptr_add(s1->got, 3 * PTR_SIZE);
|
---|
[279] | 920 | }
|
---|
| 921 |
|
---|
[331] | 922 | /* Create a GOT and (for function call) a PLT entry corresponding to a symbol
|
---|
| 923 | in s1->symtab. When creating the dynamic symbol table entry for the GOT
|
---|
| 924 | relocation, use 'size' and 'info' for the corresponding symbol metadata.
|
---|
| 925 | Returns the offset of the GOT or (if any) PLT entry. */
|
---|
| 926 | static struct sym_attr * put_got_entry(TCCState *s1, int dyn_reloc_type,
|
---|
| 927 | unsigned long size,
|
---|
| 928 | int info, int sym_index)
|
---|
[279] | 929 | {
|
---|
[331] | 930 | int need_plt_entry;
|
---|
[279] | 931 | const char *name;
|
---|
| 932 | ElfW(Sym) *sym;
|
---|
[331] | 933 | struct sym_attr *attr;
|
---|
| 934 | unsigned got_offset;
|
---|
| 935 | char plt_name[100];
|
---|
| 936 | int len;
|
---|
[279] | 937 |
|
---|
[331] | 938 | need_plt_entry = (dyn_reloc_type == R_JMP_SLOT);
|
---|
| 939 | attr = get_sym_attr(s1, sym_index, 1);
|
---|
[279] | 940 |
|
---|
[331] | 941 | /* In case a function is both called and its address taken 2 GOT entries
|
---|
| 942 | are created, one for taking the address (GOT) and the other for the PLT
|
---|
| 943 | entry (PLTGOT). */
|
---|
| 944 | if (need_plt_entry ? attr->plt_offset : attr->got_offset)
|
---|
| 945 | return attr;
|
---|
[279] | 946 |
|
---|
[331] | 947 | /* create the GOT entry */
|
---|
| 948 | got_offset = s1->got->data_offset;
|
---|
| 949 | section_ptr_add(s1->got, PTR_SIZE);
|
---|
[279] | 950 |
|
---|
[331] | 951 | /* Create the GOT relocation that will insert the address of the object or
|
---|
| 952 | function of interest in the GOT entry. This is a static relocation for
|
---|
| 953 | memory output (dlsym will give us the address of symbols) and dynamic
|
---|
| 954 | relocation otherwise (executable and DLLs). The relocation should be
|
---|
| 955 | done lazily for GOT entry with *_JUMP_SLOT relocation type (the one
|
---|
| 956 | associated to a PLT entry) but is currently done at load time for an
|
---|
| 957 | unknown reason. */
|
---|
[279] | 958 |
|
---|
[331] | 959 | sym = &((ElfW(Sym) *) symtab_section->data)[sym_index];
|
---|
| 960 | name = (char *) symtab_section->link->data + sym->st_name;
|
---|
[279] | 961 |
|
---|
[331] | 962 | if (s1->dynsym) {
|
---|
| 963 | if (ELFW(ST_BIND)(sym->st_info) == STB_LOCAL) {
|
---|
| 964 | /* Hack alarm. We don't want to emit dynamic symbols
|
---|
| 965 | and symbol based relocs for STB_LOCAL symbols, but rather
|
---|
| 966 | want to resolve them directly. At this point the symbol
|
---|
| 967 | values aren't final yet, so we must defer this. We will later
|
---|
| 968 | have to create a RELATIVE reloc anyway, so we misuse the
|
---|
| 969 | relocation slot to smuggle the symbol reference until
|
---|
| 970 | fill_local_got_entries. Not that the sym_index is
|
---|
| 971 | relative to symtab_section, not s1->dynsym! Nevertheless
|
---|
| 972 | we use s1->dyn_sym so that if this is the first call
|
---|
| 973 | that got->reloc is correctly created. Also note that
|
---|
| 974 | RELATIVE relocs are not normally created for the .got,
|
---|
| 975 | so the types serves as a marker for later (and is retained
|
---|
| 976 | also for the final output, which is okay because then the
|
---|
| 977 | got is just normal data). */
|
---|
| 978 | put_elf_reloc(s1->dynsym, s1->got, got_offset, R_RELATIVE,
|
---|
| 979 | sym_index);
|
---|
| 980 | } else {
|
---|
| 981 | if (0 == attr->dyn_index)
|
---|
| 982 | attr->dyn_index = set_elf_sym(s1->dynsym, sym->st_value, size,
|
---|
| 983 | info, 0, sym->st_shndx, name);
|
---|
| 984 | put_elf_reloc(s1->dynsym, s1->got, got_offset, dyn_reloc_type,
|
---|
| 985 | attr->dyn_index);
|
---|
| 986 | }
|
---|
| 987 | } else {
|
---|
| 988 | put_elf_reloc(symtab_section, s1->got, got_offset, dyn_reloc_type,
|
---|
| 989 | sym_index);
|
---|
| 990 | }
|
---|
[279] | 991 |
|
---|
[331] | 992 | if (need_plt_entry) {
|
---|
| 993 | if (!s1->plt) {
|
---|
| 994 | s1->plt = new_section(s1, ".plt", SHT_PROGBITS,
|
---|
| 995 | SHF_ALLOC | SHF_EXECINSTR);
|
---|
| 996 | s1->plt->sh_entsize = 4;
|
---|
[279] | 997 | }
|
---|
| 998 |
|
---|
[331] | 999 | attr->plt_offset = create_plt_entry(s1, got_offset, attr);
|
---|
[279] | 1000 |
|
---|
[331] | 1001 | /* create a symbol 'sym@plt' for the PLT jump vector */
|
---|
| 1002 | len = strlen(name);
|
---|
| 1003 | if (len > sizeof plt_name - 5)
|
---|
| 1004 | len = sizeof plt_name - 5;
|
---|
| 1005 | memcpy(plt_name, name, len);
|
---|
| 1006 | strcpy(plt_name + len, "@plt");
|
---|
| 1007 | attr->plt_sym = put_elf_sym(s1->symtab, attr->plt_offset, sym->st_size,
|
---|
| 1008 | ELFW(ST_INFO)(STB_GLOBAL, STT_FUNC), 0, s1->plt->sh_num, plt_name);
|
---|
[279] | 1009 |
|
---|
[331] | 1010 | } else {
|
---|
| 1011 | attr->got_offset = got_offset;
|
---|
[279] | 1012 | }
|
---|
[331] | 1013 |
|
---|
| 1014 | return attr;
|
---|
[279] | 1015 | }
|
---|
| 1016 |
|
---|
| 1017 | /* build GOT and PLT entries */
|
---|
| 1018 | ST_FUNC void build_got_entries(TCCState *s1)
|
---|
| 1019 | {
|
---|
| 1020 | Section *s;
|
---|
[331] | 1021 | ElfW_Rel *rel;
|
---|
[279] | 1022 | ElfW(Sym) *sym;
|
---|
[331] | 1023 | int i, type, gotplt_entry, reloc_type, sym_index;
|
---|
| 1024 | struct sym_attr *attr;
|
---|
[279] | 1025 |
|
---|
| 1026 | for(i = 1; i < s1->nb_sections; i++) {
|
---|
| 1027 | s = s1->sections[i];
|
---|
| 1028 | if (s->sh_type != SHT_RELX)
|
---|
| 1029 | continue;
|
---|
| 1030 | /* no need to handle got relocations */
|
---|
| 1031 | if (s->link != symtab_section)
|
---|
| 1032 | continue;
|
---|
[331] | 1033 | for_each_elem(s, 0, rel, ElfW_Rel) {
|
---|
[279] | 1034 | type = ELFW(R_TYPE)(rel->r_info);
|
---|
[331] | 1035 | gotplt_entry = gotplt_entry_type(type);
|
---|
| 1036 | sym_index = ELFW(R_SYM)(rel->r_info);
|
---|
| 1037 | sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
|
---|
| 1038 |
|
---|
| 1039 | if (gotplt_entry == NO_GOTPLT_ENTRY) {
|
---|
| 1040 | continue;
|
---|
| 1041 | }
|
---|
| 1042 |
|
---|
| 1043 | /* Automatically create PLT/GOT [entry] if it is an undefined
|
---|
| 1044 | reference (resolved at runtime), or the symbol is absolute,
|
---|
| 1045 | probably created by tcc_add_symbol, and thus on 64-bit
|
---|
| 1046 | targets might be too far from application code. */
|
---|
| 1047 | if (gotplt_entry == AUTO_GOTPLT_ENTRY) {
|
---|
| 1048 | if (sym->st_shndx == SHN_UNDEF) {
|
---|
| 1049 | ElfW(Sym) *esym;
|
---|
| 1050 | int dynindex;
|
---|
| 1051 | if (s1->output_type == TCC_OUTPUT_DLL && ! PCRELATIVE_DLLPLT)
|
---|
| 1052 | continue;
|
---|
| 1053 | /* Relocations for UNDEF symbols would normally need
|
---|
| 1054 | to be transferred into the executable or shared object.
|
---|
| 1055 | If that were done AUTO_GOTPLT_ENTRY wouldn't exist.
|
---|
| 1056 | But TCC doesn't do that (at least for exes), so we
|
---|
| 1057 | need to resolve all such relocs locally. And that
|
---|
| 1058 | means PLT slots for functions in DLLs and COPY relocs for
|
---|
| 1059 | data symbols. COPY relocs were generated in
|
---|
| 1060 | bind_exe_dynsyms (and the symbol adjusted to be defined),
|
---|
| 1061 | and for functions we were generated a dynamic symbol
|
---|
| 1062 | of function type. */
|
---|
| 1063 | if (s1->dynsym) {
|
---|
| 1064 | /* dynsym isn't set for -run :-/ */
|
---|
| 1065 | dynindex = get_sym_attr(s1, sym_index, 0)->dyn_index;
|
---|
| 1066 | esym = (ElfW(Sym) *)s1->dynsym->data + dynindex;
|
---|
| 1067 | if (dynindex
|
---|
| 1068 | && (ELFW(ST_TYPE)(esym->st_info) == STT_FUNC
|
---|
| 1069 | || (ELFW(ST_TYPE)(esym->st_info) == STT_NOTYPE
|
---|
| 1070 | && ELFW(ST_TYPE)(sym->st_info) == STT_FUNC)))
|
---|
| 1071 | goto jmp_slot;
|
---|
| 1072 | }
|
---|
| 1073 | } else if (!(sym->st_shndx == SHN_ABS
|
---|
| 1074 | #ifndef TCC_TARGET_ARM
|
---|
| 1075 | && PTR_SIZE == 8
|
---|
[279] | 1076 | #endif
|
---|
[331] | 1077 | ))
|
---|
| 1078 | continue;
|
---|
[279] | 1079 | }
|
---|
| 1080 |
|
---|
[331] | 1081 | #ifdef TCC_TARGET_X86_64
|
---|
| 1082 | if ((type == R_X86_64_PLT32 || type == R_X86_64_PC32) &&
|
---|
| 1083 | (ELFW(ST_VISIBILITY)(sym->st_other) != STV_DEFAULT ||
|
---|
| 1084 | ELFW(ST_BIND)(sym->st_info) == STB_LOCAL)) {
|
---|
| 1085 | rel->r_info = ELFW(R_INFO)(sym_index, R_X86_64_PC32);
|
---|
| 1086 | continue;
|
---|
| 1087 | }
|
---|
| 1088 | #endif
|
---|
| 1089 | if (code_reloc(type)) {
|
---|
| 1090 | jmp_slot:
|
---|
| 1091 | reloc_type = R_JMP_SLOT;
|
---|
| 1092 | } else
|
---|
| 1093 | reloc_type = R_GLOB_DAT;
|
---|
[279] | 1094 |
|
---|
[331] | 1095 | if (!s1->got)
|
---|
| 1096 | build_got(s1);
|
---|
[279] | 1097 |
|
---|
[331] | 1098 | if (gotplt_entry == BUILD_GOT_ONLY)
|
---|
| 1099 | continue;
|
---|
[279] | 1100 |
|
---|
[331] | 1101 | attr = put_got_entry(s1, reloc_type, sym->st_size, sym->st_info,
|
---|
| 1102 | sym_index);
|
---|
| 1103 |
|
---|
| 1104 | if (reloc_type == R_JMP_SLOT)
|
---|
| 1105 | rel->r_info = ELFW(R_INFO)(attr->plt_sym, type);
|
---|
| 1106 | }
|
---|
| 1107 | }
|
---|
[279] | 1108 | }
|
---|
| 1109 |
|
---|
| 1110 | /* put dynamic tag */
|
---|
| 1111 | static void put_dt(Section *dynamic, int dt, addr_t val)
|
---|
| 1112 | {
|
---|
| 1113 | ElfW(Dyn) *dyn;
|
---|
| 1114 | dyn = section_ptr_add(dynamic, sizeof(ElfW(Dyn)));
|
---|
| 1115 | dyn->d_tag = dt;
|
---|
| 1116 | dyn->d_un.d_val = val;
|
---|
| 1117 | }
|
---|
| 1118 |
|
---|
[331] | 1119 | #ifndef TCC_TARGET_PE
|
---|
[279] | 1120 | static void add_init_array_defines(TCCState *s1, const char *section_name)
|
---|
| 1121 | {
|
---|
| 1122 | Section *s;
|
---|
| 1123 | long end_offset;
|
---|
| 1124 | char sym_start[1024];
|
---|
| 1125 | char sym_end[1024];
|
---|
[331] | 1126 |
|
---|
[279] | 1127 | snprintf(sym_start, sizeof(sym_start), "__%s_start", section_name + 1);
|
---|
| 1128 | snprintf(sym_end, sizeof(sym_end), "__%s_end", section_name + 1);
|
---|
| 1129 |
|
---|
| 1130 | s = find_section(s1, section_name);
|
---|
| 1131 | if (!s) {
|
---|
| 1132 | end_offset = 0;
|
---|
| 1133 | s = data_section;
|
---|
| 1134 | } else {
|
---|
| 1135 | end_offset = s->data_offset;
|
---|
| 1136 | }
|
---|
| 1137 |
|
---|
[331] | 1138 | set_elf_sym(symtab_section,
|
---|
[279] | 1139 | 0, 0,
|
---|
| 1140 | ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
|
---|
| 1141 | s->sh_num, sym_start);
|
---|
[331] | 1142 | set_elf_sym(symtab_section,
|
---|
[279] | 1143 | end_offset, 0,
|
---|
| 1144 | ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
|
---|
| 1145 | s->sh_num, sym_end);
|
---|
| 1146 | }
|
---|
[331] | 1147 | #endif
|
---|
[279] | 1148 |
|
---|
[331] | 1149 | static int tcc_add_support(TCCState *s1, const char *filename)
|
---|
| 1150 | {
|
---|
| 1151 | char buf[1024];
|
---|
| 1152 | snprintf(buf, sizeof(buf), "%s/%s", s1->tcc_lib_path, filename);
|
---|
| 1153 | return tcc_add_file(s1, buf);
|
---|
| 1154 | }
|
---|
| 1155 |
|
---|
[279] | 1156 | ST_FUNC void tcc_add_bcheck(TCCState *s1)
|
---|
| 1157 | {
|
---|
| 1158 | #ifdef CONFIG_TCC_BCHECK
|
---|
[331] | 1159 | addr_t *ptr;
|
---|
[279] | 1160 | int sym_index;
|
---|
| 1161 |
|
---|
| 1162 | if (0 == s1->do_bounds_check)
|
---|
| 1163 | return;
|
---|
| 1164 | /* XXX: add an object file to do that */
|
---|
[331] | 1165 | ptr = section_ptr_add(bounds_section, sizeof(*ptr));
|
---|
[279] | 1166 | *ptr = 0;
|
---|
[331] | 1167 | set_elf_sym(symtab_section, 0, 0,
|
---|
[279] | 1168 | ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
|
---|
| 1169 | bounds_section->sh_num, "__bounds_start");
|
---|
[331] | 1170 | /* pull bcheck.o from libtcc1.a */
|
---|
| 1171 | sym_index = set_elf_sym(symtab_section, 0, 0,
|
---|
| 1172 | ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
|
---|
| 1173 | SHN_UNDEF, "__bound_init");
|
---|
[279] | 1174 | if (s1->output_type != TCC_OUTPUT_MEMORY) {
|
---|
| 1175 | /* add 'call __bound_init()' in .init section */
|
---|
[331] | 1176 | Section *init_section = find_section(s1, ".init");
|
---|
| 1177 | unsigned char *pinit = section_ptr_add(init_section, 5);
|
---|
[279] | 1178 | pinit[0] = 0xe8;
|
---|
[331] | 1179 | write32le(pinit + 1, -4);
|
---|
[279] | 1180 | put_elf_reloc(symtab_section, init_section,
|
---|
[331] | 1181 | init_section->data_offset - 4, R_386_PC32, sym_index);
|
---|
| 1182 | /* R_386_PC32 = R_X86_64_PC32 = 2 */
|
---|
[279] | 1183 | }
|
---|
| 1184 | #endif
|
---|
| 1185 | }
|
---|
| 1186 |
|
---|
| 1187 | /* add tcc runtime libraries */
|
---|
| 1188 | ST_FUNC void tcc_add_runtime(TCCState *s1)
|
---|
| 1189 | {
|
---|
| 1190 | tcc_add_bcheck(s1);
|
---|
[331] | 1191 | tcc_add_pragma_libs(s1);
|
---|
[279] | 1192 | /* add libc */
|
---|
| 1193 | if (!s1->nostdlib) {
|
---|
[331] | 1194 | tcc_add_library_err(s1, "c");
|
---|
| 1195 | #ifdef TCC_LIBGCC
|
---|
| 1196 | if (!s1->static_link) {
|
---|
| 1197 | if (TCC_LIBGCC[0] == '/')
|
---|
| 1198 | tcc_add_file(s1, TCC_LIBGCC);
|
---|
| 1199 | else
|
---|
| 1200 | tcc_add_dll(s1, TCC_LIBGCC, 0);
|
---|
| 1201 | }
|
---|
[279] | 1202 | #endif
|
---|
[331] | 1203 | tcc_add_support(s1, TCC_LIBTCC1);
|
---|
[279] | 1204 | /* add crt end if not memory output */
|
---|
| 1205 | if (s1->output_type != TCC_OUTPUT_MEMORY)
|
---|
| 1206 | tcc_add_crt(s1, "crtn.o");
|
---|
| 1207 | }
|
---|
| 1208 | }
|
---|
| 1209 |
|
---|
| 1210 | /* add various standard linker symbols (must be done after the
|
---|
| 1211 | sections are filled (for example after allocating common
|
---|
| 1212 | symbols)) */
|
---|
[331] | 1213 | static void tcc_add_linker_symbols(TCCState *s1)
|
---|
[279] | 1214 | {
|
---|
| 1215 | char buf[1024];
|
---|
| 1216 | int i;
|
---|
| 1217 | Section *s;
|
---|
| 1218 |
|
---|
[331] | 1219 | set_elf_sym(symtab_section,
|
---|
[279] | 1220 | text_section->data_offset, 0,
|
---|
| 1221 | ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
|
---|
| 1222 | text_section->sh_num, "_etext");
|
---|
[331] | 1223 | set_elf_sym(symtab_section,
|
---|
[279] | 1224 | data_section->data_offset, 0,
|
---|
| 1225 | ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
|
---|
| 1226 | data_section->sh_num, "_edata");
|
---|
[331] | 1227 | set_elf_sym(symtab_section,
|
---|
[279] | 1228 | bss_section->data_offset, 0,
|
---|
| 1229 | ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
|
---|
| 1230 | bss_section->sh_num, "_end");
|
---|
[331] | 1231 | #ifndef TCC_TARGET_PE
|
---|
[279] | 1232 | /* horrible new standard ldscript defines */
|
---|
| 1233 | add_init_array_defines(s1, ".preinit_array");
|
---|
| 1234 | add_init_array_defines(s1, ".init_array");
|
---|
| 1235 | add_init_array_defines(s1, ".fini_array");
|
---|
[331] | 1236 | #endif
|
---|
| 1237 |
|
---|
[279] | 1238 | /* add start and stop symbols for sections whose name can be
|
---|
| 1239 | expressed in C */
|
---|
| 1240 | for(i = 1; i < s1->nb_sections; i++) {
|
---|
| 1241 | s = s1->sections[i];
|
---|
| 1242 | if (s->sh_type == SHT_PROGBITS &&
|
---|
| 1243 | (s->sh_flags & SHF_ALLOC)) {
|
---|
| 1244 | const char *p;
|
---|
| 1245 | int ch;
|
---|
| 1246 |
|
---|
| 1247 | /* check if section name can be expressed in C */
|
---|
| 1248 | p = s->name;
|
---|
| 1249 | for(;;) {
|
---|
| 1250 | ch = *p;
|
---|
| 1251 | if (!ch)
|
---|
| 1252 | break;
|
---|
| 1253 | if (!isid(ch) && !isnum(ch))
|
---|
| 1254 | goto next_sec;
|
---|
| 1255 | p++;
|
---|
| 1256 | }
|
---|
| 1257 | snprintf(buf, sizeof(buf), "__start_%s", s->name);
|
---|
[331] | 1258 | set_elf_sym(symtab_section,
|
---|
[279] | 1259 | 0, 0,
|
---|
| 1260 | ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
|
---|
| 1261 | s->sh_num, buf);
|
---|
| 1262 | snprintf(buf, sizeof(buf), "__stop_%s", s->name);
|
---|
[331] | 1263 | set_elf_sym(symtab_section,
|
---|
[279] | 1264 | s->data_offset, 0,
|
---|
| 1265 | ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
|
---|
| 1266 | s->sh_num, buf);
|
---|
| 1267 | }
|
---|
| 1268 | next_sec: ;
|
---|
| 1269 | }
|
---|
| 1270 | }
|
---|
| 1271 |
|
---|
[331] | 1272 | ST_FUNC void resolve_common_syms(TCCState *s1)
|
---|
| 1273 | {
|
---|
| 1274 | ElfW(Sym) *sym;
|
---|
| 1275 |
|
---|
| 1276 | /* Allocate common symbols in BSS. */
|
---|
| 1277 | for_each_elem(symtab_section, 1, sym, ElfW(Sym)) {
|
---|
| 1278 | if (sym->st_shndx == SHN_COMMON) {
|
---|
| 1279 | /* symbol alignment is in st_value for SHN_COMMONs */
|
---|
| 1280 | sym->st_value = section_add(bss_section, sym->st_size,
|
---|
| 1281 | sym->st_value);
|
---|
| 1282 | sym->st_shndx = bss_section->sh_num;
|
---|
| 1283 | }
|
---|
| 1284 | }
|
---|
| 1285 |
|
---|
| 1286 | /* Now assign linker provided symbols their value. */
|
---|
| 1287 | tcc_add_linker_symbols(s1);
|
---|
| 1288 | }
|
---|
| 1289 |
|
---|
[279] | 1290 | static void tcc_output_binary(TCCState *s1, FILE *f,
|
---|
[331] | 1291 | const int *sec_order)
|
---|
[279] | 1292 | {
|
---|
| 1293 | Section *s;
|
---|
| 1294 | int i, offset, size;
|
---|
| 1295 |
|
---|
| 1296 | offset = 0;
|
---|
| 1297 | for(i=1;i<s1->nb_sections;i++) {
|
---|
[331] | 1298 | s = s1->sections[sec_order[i]];
|
---|
[279] | 1299 | if (s->sh_type != SHT_NOBITS &&
|
---|
| 1300 | (s->sh_flags & SHF_ALLOC)) {
|
---|
| 1301 | while (offset < s->sh_offset) {
|
---|
| 1302 | fputc(0, f);
|
---|
| 1303 | offset++;
|
---|
| 1304 | }
|
---|
| 1305 | size = s->sh_size;
|
---|
| 1306 | fwrite(s->data, 1, size, f);
|
---|
| 1307 | offset += size;
|
---|
| 1308 | }
|
---|
| 1309 | }
|
---|
| 1310 | }
|
---|
| 1311 |
|
---|
| 1312 | ST_FUNC void fill_got_entry(TCCState *s1, ElfW_Rel *rel)
|
---|
| 1313 | {
|
---|
[331] | 1314 | int sym_index = ELFW(R_SYM) (rel->r_info);
|
---|
| 1315 | ElfW(Sym) *sym = &((ElfW(Sym) *) symtab_section->data)[sym_index];
|
---|
| 1316 | struct sym_attr *attr = get_sym_attr(s1, sym_index, 0);
|
---|
| 1317 | unsigned offset = attr->got_offset;
|
---|
[279] | 1318 |
|
---|
[331] | 1319 | if (0 == offset)
|
---|
| 1320 | return;
|
---|
| 1321 | section_reserve(s1->got, offset + PTR_SIZE);
|
---|
[279] | 1322 | #ifdef TCC_TARGET_X86_64
|
---|
[331] | 1323 | write64le(s1->got->data + offset, sym->st_value);
|
---|
| 1324 | #else
|
---|
| 1325 | write32le(s1->got->data + offset, sym->st_value);
|
---|
[279] | 1326 | #endif
|
---|
| 1327 | }
|
---|
| 1328 |
|
---|
[331] | 1329 | /* Perform relocation to GOT or PLT entries */
|
---|
[279] | 1330 | ST_FUNC void fill_got(TCCState *s1)
|
---|
| 1331 | {
|
---|
[331] | 1332 | Section *s;
|
---|
| 1333 | ElfW_Rel *rel;
|
---|
| 1334 | int i;
|
---|
[279] | 1335 |
|
---|
[331] | 1336 | for(i = 1; i < s1->nb_sections; i++) {
|
---|
| 1337 | s = s1->sections[i];
|
---|
| 1338 | if (s->sh_type != SHT_RELX)
|
---|
| 1339 | continue;
|
---|
| 1340 | /* no need to handle got relocations */
|
---|
| 1341 | if (s->link != symtab_section)
|
---|
| 1342 | continue;
|
---|
| 1343 | for_each_elem(s, 0, rel, ElfW_Rel) {
|
---|
| 1344 | switch (ELFW(R_TYPE) (rel->r_info)) {
|
---|
| 1345 | case R_X86_64_GOT32:
|
---|
| 1346 | case R_X86_64_GOTPCREL:
|
---|
| 1347 | case R_X86_64_GOTPCRELX:
|
---|
| 1348 | case R_X86_64_REX_GOTPCRELX:
|
---|
| 1349 | case R_X86_64_PLT32:
|
---|
| 1350 | fill_got_entry(s1, rel);
|
---|
| 1351 | break;
|
---|
| 1352 | }
|
---|
| 1353 | }
|
---|
| 1354 | }
|
---|
[279] | 1355 | }
|
---|
| 1356 |
|
---|
[331] | 1357 | /* See put_got_entry for a description. This is the second stage
|
---|
| 1358 | where GOT references to local defined symbols are rewritten. */
|
---|
| 1359 | static void fill_local_got_entries(TCCState *s1)
|
---|
[279] | 1360 | {
|
---|
[331] | 1361 | ElfW_Rel *rel;
|
---|
| 1362 | for_each_elem(s1->got->reloc, 0, rel, ElfW_Rel) {
|
---|
| 1363 | if (ELFW(R_TYPE)(rel->r_info) == R_RELATIVE) {
|
---|
| 1364 | int sym_index = ELFW(R_SYM) (rel->r_info);
|
---|
| 1365 | ElfW(Sym) *sym = &((ElfW(Sym) *) symtab_section->data)[sym_index];
|
---|
| 1366 | struct sym_attr *attr = get_sym_attr(s1, sym_index, 0);
|
---|
| 1367 | unsigned offset = attr->got_offset;
|
---|
| 1368 | if (offset != rel->r_offset - s1->got->sh_addr)
|
---|
| 1369 | tcc_error_noabort("huh");
|
---|
| 1370 | rel->r_info = ELFW(R_INFO)(0, R_RELATIVE);
|
---|
| 1371 | #if SHT_RELX == SHT_RELA
|
---|
| 1372 | rel->r_addend = sym->st_value;
|
---|
| 1373 | #else
|
---|
| 1374 | /* All our REL architectures also happen to be 32bit LE. */
|
---|
| 1375 | write32le(s1->got->data + offset, sym->st_value);
|
---|
[279] | 1376 | #endif
|
---|
[331] | 1377 | }
|
---|
[279] | 1378 | }
|
---|
[331] | 1379 | }
|
---|
[279] | 1380 |
|
---|
[331] | 1381 | /* Bind symbols of executable: resolve undefined symbols from exported symbols
|
---|
| 1382 | in shared libraries and export non local defined symbols to shared libraries
|
---|
| 1383 | if -rdynamic switch was given on command line */
|
---|
| 1384 | static void bind_exe_dynsyms(TCCState *s1)
|
---|
| 1385 | {
|
---|
| 1386 | const char *name;
|
---|
| 1387 | int sym_index, index;
|
---|
| 1388 | ElfW(Sym) *sym, *esym;
|
---|
| 1389 | int type;
|
---|
[279] | 1390 |
|
---|
[331] | 1391 | /* Resolve undefined symbols from dynamic symbols. When there is a match:
|
---|
| 1392 | - if STT_FUNC or STT_GNU_IFUNC symbol -> add it in PLT
|
---|
| 1393 | - if STT_OBJECT symbol -> add it in .bss section with suitable reloc */
|
---|
| 1394 | for_each_elem(symtab_section, 1, sym, ElfW(Sym)) {
|
---|
| 1395 | if (sym->st_shndx == SHN_UNDEF) {
|
---|
| 1396 | name = (char *) symtab_section->link->data + sym->st_name;
|
---|
| 1397 | sym_index = find_elf_sym(s1->dynsymtab_section, name);
|
---|
| 1398 | if (sym_index) {
|
---|
| 1399 | esym = &((ElfW(Sym) *)s1->dynsymtab_section->data)[sym_index];
|
---|
| 1400 | type = ELFW(ST_TYPE)(esym->st_info);
|
---|
| 1401 | if ((type == STT_FUNC) || (type == STT_GNU_IFUNC)) {
|
---|
| 1402 | /* Indirect functions shall have STT_FUNC type in executable
|
---|
| 1403 | * dynsym section. Indeed, a dlsym call following a lazy
|
---|
| 1404 | * resolution would pick the symbol value from the
|
---|
| 1405 | * executable dynsym entry which would contain the address
|
---|
| 1406 | * of the function wanted by the caller of dlsym instead of
|
---|
| 1407 | * the address of the function that would return that
|
---|
| 1408 | * address */
|
---|
| 1409 | int dynindex
|
---|
| 1410 | = put_elf_sym(s1->dynsym, 0, esym->st_size,
|
---|
| 1411 | ELFW(ST_INFO)(STB_GLOBAL,STT_FUNC), 0, 0,
|
---|
| 1412 | name);
|
---|
| 1413 | int index = sym - (ElfW(Sym) *) symtab_section->data;
|
---|
| 1414 | get_sym_attr(s1, index, 1)->dyn_index = dynindex;
|
---|
| 1415 | } else if (type == STT_OBJECT) {
|
---|
| 1416 | unsigned long offset;
|
---|
| 1417 | ElfW(Sym) *dynsym;
|
---|
| 1418 | offset = bss_section->data_offset;
|
---|
| 1419 | /* XXX: which alignment ? */
|
---|
| 1420 | offset = (offset + 16 - 1) & -16;
|
---|
| 1421 | set_elf_sym (s1->symtab, offset, esym->st_size,
|
---|
| 1422 | esym->st_info, 0, bss_section->sh_num, name);
|
---|
| 1423 | index = put_elf_sym(s1->dynsym, offset, esym->st_size,
|
---|
| 1424 | esym->st_info, 0, bss_section->sh_num,
|
---|
| 1425 | name);
|
---|
[279] | 1426 |
|
---|
[331] | 1427 | /* Ensure R_COPY works for weak symbol aliases */
|
---|
| 1428 | if (ELFW(ST_BIND)(esym->st_info) == STB_WEAK) {
|
---|
| 1429 | for_each_elem(s1->dynsymtab_section, 1, dynsym, ElfW(Sym)) {
|
---|
| 1430 | if ((dynsym->st_value == esym->st_value)
|
---|
| 1431 | && (ELFW(ST_BIND)(dynsym->st_info) == STB_GLOBAL)) {
|
---|
| 1432 | char *dynname = (char *) s1->dynsymtab_section->link->data
|
---|
| 1433 | + dynsym->st_name;
|
---|
| 1434 | put_elf_sym(s1->dynsym, offset, dynsym->st_size,
|
---|
| 1435 | dynsym->st_info, 0,
|
---|
| 1436 | bss_section->sh_num, dynname);
|
---|
| 1437 | break;
|
---|
[279] | 1438 | }
|
---|
| 1439 | }
|
---|
| 1440 | }
|
---|
| 1441 |
|
---|
[331] | 1442 | put_elf_reloc(s1->dynsym, bss_section,
|
---|
| 1443 | offset, R_COPY, index);
|
---|
| 1444 | offset += esym->st_size;
|
---|
| 1445 | bss_section->data_offset = offset;
|
---|
[279] | 1446 | }
|
---|
| 1447 | } else {
|
---|
[331] | 1448 | /* STB_WEAK undefined symbols are accepted */
|
---|
| 1449 | /* XXX: _fp_hw seems to be part of the ABI, so we ignore it */
|
---|
| 1450 | if (ELFW(ST_BIND)(sym->st_info) == STB_WEAK ||
|
---|
| 1451 | !strcmp(name, "_fp_hw")) {
|
---|
| 1452 | } else {
|
---|
| 1453 | tcc_error_noabort("undefined symbol '%s'", name);
|
---|
[279] | 1454 | }
|
---|
| 1455 | }
|
---|
[331] | 1456 | } else if (s1->rdynamic && ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) {
|
---|
| 1457 | /* if -rdynamic option, then export all non local symbols */
|
---|
| 1458 | name = (char *) symtab_section->link->data + sym->st_name;
|
---|
| 1459 | set_elf_sym(s1->dynsym, sym->st_value, sym->st_size, sym->st_info,
|
---|
| 1460 | 0, sym->st_shndx, name);
|
---|
| 1461 | }
|
---|
| 1462 | }
|
---|
| 1463 | }
|
---|
[279] | 1464 |
|
---|
[331] | 1465 | /* Bind symbols of libraries: export all non local symbols of executable that
|
---|
| 1466 | are referenced by shared libraries. The reason is that the dynamic loader
|
---|
| 1467 | search symbol first in executable and then in libraries. Therefore a
|
---|
| 1468 | reference to a symbol already defined by a library can still be resolved by
|
---|
| 1469 | a symbol in the executable. */
|
---|
| 1470 | static void bind_libs_dynsyms(TCCState *s1)
|
---|
| 1471 | {
|
---|
| 1472 | const char *name;
|
---|
| 1473 | int sym_index;
|
---|
| 1474 | ElfW(Sym) *sym, *esym;
|
---|
[279] | 1475 |
|
---|
[331] | 1476 | for_each_elem(s1->dynsymtab_section, 1, esym, ElfW(Sym)) {
|
---|
| 1477 | name = (char *) s1->dynsymtab_section->link->data + esym->st_name;
|
---|
| 1478 | sym_index = find_elf_sym(symtab_section, name);
|
---|
| 1479 | sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
|
---|
| 1480 | if (sym_index && sym->st_shndx != SHN_UNDEF
|
---|
| 1481 | && ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) {
|
---|
| 1482 | set_elf_sym(s1->dynsym, sym->st_value, sym->st_size,
|
---|
| 1483 | sym->st_info, 0, sym->st_shndx, name);
|
---|
| 1484 | } else if (esym->st_shndx == SHN_UNDEF) {
|
---|
| 1485 | /* weak symbols can stay undefined */
|
---|
| 1486 | if (ELFW(ST_BIND)(esym->st_info) != STB_WEAK)
|
---|
| 1487 | tcc_warning("undefined dynamic symbol '%s'", name);
|
---|
| 1488 | }
|
---|
| 1489 | }
|
---|
| 1490 | }
|
---|
[279] | 1491 |
|
---|
[331] | 1492 | /* Export all non local symbols. This is used by shared libraries so that the
|
---|
| 1493 | non local symbols they define can resolve a reference in another shared
|
---|
| 1494 | library or in the executable. Correspondingly, it allows undefined local
|
---|
| 1495 | symbols to be resolved by other shared libraries or by the executable. */
|
---|
| 1496 | static void export_global_syms(TCCState *s1)
|
---|
| 1497 | {
|
---|
| 1498 | int dynindex, index;
|
---|
| 1499 | const char *name;
|
---|
| 1500 | ElfW(Sym) *sym;
|
---|
[279] | 1501 |
|
---|
[331] | 1502 | for_each_elem(symtab_section, 1, sym, ElfW(Sym)) {
|
---|
| 1503 | if (ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) {
|
---|
| 1504 | name = (char *) symtab_section->link->data + sym->st_name;
|
---|
| 1505 | dynindex = put_elf_sym(s1->dynsym, sym->st_value, sym->st_size,
|
---|
| 1506 | sym->st_info, 0, sym->st_shndx, name);
|
---|
| 1507 | index = sym - (ElfW(Sym) *) symtab_section->data;
|
---|
| 1508 | get_sym_attr(s1, index, 1)->dyn_index = dynindex;
|
---|
[279] | 1509 | }
|
---|
| 1510 | }
|
---|
[331] | 1511 | }
|
---|
[279] | 1512 |
|
---|
[331] | 1513 | /* Allocate strings for section names and decide if an unallocated section
|
---|
| 1514 | should be output.
|
---|
| 1515 | NOTE: the strsec section comes last, so its size is also correct ! */
|
---|
| 1516 | static int alloc_sec_names(TCCState *s1, int file_type, Section *strsec)
|
---|
| 1517 | {
|
---|
| 1518 | int i;
|
---|
| 1519 | Section *s;
|
---|
| 1520 | int textrel = 0;
|
---|
[279] | 1521 |
|
---|
[331] | 1522 | /* Allocate strings for section names */
|
---|
[279] | 1523 | for(i = 1; i < s1->nb_sections; i++) {
|
---|
| 1524 | s = s1->sections[i];
|
---|
| 1525 | /* when generating a DLL, we include relocations but we may
|
---|
| 1526 | patch them */
|
---|
[331] | 1527 | if (file_type == TCC_OUTPUT_DLL &&
|
---|
| 1528 | s->sh_type == SHT_RELX &&
|
---|
| 1529 | !(s->sh_flags & SHF_ALLOC) &&
|
---|
| 1530 | (s1->sections[s->sh_info]->sh_flags & SHF_ALLOC) &&
|
---|
| 1531 | prepare_dynamic_rel(s1, s)) {
|
---|
| 1532 | if (s1->sections[s->sh_info]->sh_flags & SHF_EXECINSTR)
|
---|
| 1533 | textrel = 1;
|
---|
[279] | 1534 | } else if (s1->do_debug ||
|
---|
[331] | 1535 | file_type == TCC_OUTPUT_OBJ ||
|
---|
[279] | 1536 | (s->sh_flags & SHF_ALLOC) ||
|
---|
[331] | 1537 | i == (s1->nb_sections - 1)) {
|
---|
[279] | 1538 | /* we output all sections if debug or object file */
|
---|
| 1539 | s->sh_size = s->data_offset;
|
---|
| 1540 | }
|
---|
[331] | 1541 | if (s->sh_size || (s->sh_flags & SHF_ALLOC))
|
---|
| 1542 | s->sh_name = put_elf_str(strsec, s->name);
|
---|
[279] | 1543 | }
|
---|
[331] | 1544 | strsec->sh_size = strsec->data_offset;
|
---|
| 1545 | return textrel;
|
---|
| 1546 | }
|
---|
[279] | 1547 |
|
---|
[331] | 1548 | /* Info to be copied in dynamic section */
|
---|
| 1549 | struct dyn_inf {
|
---|
| 1550 | Section *dynamic;
|
---|
| 1551 | Section *dynstr;
|
---|
| 1552 | unsigned long data_offset;
|
---|
| 1553 | addr_t rel_addr;
|
---|
| 1554 | addr_t rel_size;
|
---|
| 1555 | #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
---|
| 1556 | addr_t bss_addr;
|
---|
| 1557 | addr_t bss_size;
|
---|
| 1558 | #endif
|
---|
| 1559 | };
|
---|
| 1560 |
|
---|
| 1561 | /* Assign sections to segments and decide how are sections laid out when loaded
|
---|
| 1562 | in memory. This function also fills corresponding program headers. */
|
---|
| 1563 | static int layout_sections(TCCState *s1, ElfW(Phdr) *phdr, int phnum,
|
---|
| 1564 | Section *interp, Section* strsec,
|
---|
| 1565 | struct dyn_inf *dyninf, int *sec_order)
|
---|
| 1566 | {
|
---|
| 1567 | int i, j, k, file_type, sh_order_index, file_offset;
|
---|
| 1568 | unsigned long s_align;
|
---|
| 1569 | long long tmp;
|
---|
| 1570 | addr_t addr;
|
---|
| 1571 | ElfW(Phdr) *ph;
|
---|
| 1572 | Section *s;
|
---|
| 1573 |
|
---|
| 1574 | file_type = s1->output_type;
|
---|
| 1575 | sh_order_index = 1;
|
---|
| 1576 | file_offset = 0;
|
---|
| 1577 | if (s1->output_format == TCC_OUTPUT_FORMAT_ELF)
|
---|
[279] | 1578 | file_offset = sizeof(ElfW(Ehdr)) + phnum * sizeof(ElfW(Phdr));
|
---|
[331] | 1579 | s_align = ELF_PAGE_SIZE;
|
---|
| 1580 | if (s1->section_align)
|
---|
| 1581 | s_align = s1->section_align;
|
---|
| 1582 |
|
---|
[279] | 1583 | if (phnum > 0) {
|
---|
[331] | 1584 | if (s1->has_text_addr) {
|
---|
[279] | 1585 | int a_offset, p_offset;
|
---|
| 1586 | addr = s1->text_addr;
|
---|
| 1587 | /* we ensure that (addr % ELF_PAGE_SIZE) == file_offset %
|
---|
| 1588 | ELF_PAGE_SIZE */
|
---|
[331] | 1589 | a_offset = (int) (addr & (s_align - 1));
|
---|
| 1590 | p_offset = file_offset & (s_align - 1);
|
---|
| 1591 | if (a_offset < p_offset)
|
---|
| 1592 | a_offset += s_align;
|
---|
[279] | 1593 | file_offset += (a_offset - p_offset);
|
---|
| 1594 | } else {
|
---|
| 1595 | if (file_type == TCC_OUTPUT_DLL)
|
---|
| 1596 | addr = 0;
|
---|
| 1597 | else
|
---|
| 1598 | addr = ELF_START_ADDR;
|
---|
| 1599 | /* compute address after headers */
|
---|
[331] | 1600 | addr += (file_offset & (s_align - 1));
|
---|
[279] | 1601 | }
|
---|
| 1602 |
|
---|
| 1603 | ph = &phdr[0];
|
---|
[331] | 1604 | /* Leave one program headers for the program interpreter and one for
|
---|
| 1605 | the program header table itself if needed. These are done later as
|
---|
| 1606 | they require section layout to be done first. */
|
---|
[279] | 1607 | if (interp)
|
---|
[331] | 1608 | ph += 2;
|
---|
[279] | 1609 |
|
---|
[331] | 1610 | /* dynamic relocation table information, for .dynamic section */
|
---|
| 1611 | dyninf->rel_addr = dyninf->rel_size = 0;
|
---|
| 1612 | #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
---|
| 1613 | dyninf->bss_addr = dyninf->bss_size = 0;
|
---|
| 1614 | #endif
|
---|
| 1615 |
|
---|
[279] | 1616 | for(j = 0; j < 2; j++) {
|
---|
| 1617 | ph->p_type = PT_LOAD;
|
---|
| 1618 | if (j == 0)
|
---|
| 1619 | ph->p_flags = PF_R | PF_X;
|
---|
| 1620 | else
|
---|
| 1621 | ph->p_flags = PF_R | PF_W;
|
---|
[331] | 1622 | ph->p_align = s_align;
|
---|
| 1623 |
|
---|
| 1624 | /* Decide the layout of sections loaded in memory. This must
|
---|
| 1625 | be done before program headers are filled since they contain
|
---|
| 1626 | info about the layout. We do the following ordering: interp,
|
---|
| 1627 | symbol tables, relocations, progbits, nobits */
|
---|
[279] | 1628 | /* XXX: do faster and simpler sorting */
|
---|
| 1629 | for(k = 0; k < 5; k++) {
|
---|
| 1630 | for(i = 1; i < s1->nb_sections; i++) {
|
---|
| 1631 | s = s1->sections[i];
|
---|
| 1632 | /* compute if section should be included */
|
---|
| 1633 | if (j == 0) {
|
---|
[331] | 1634 | if ((s->sh_flags & (SHF_ALLOC | SHF_WRITE)) !=
|
---|
[279] | 1635 | SHF_ALLOC)
|
---|
| 1636 | continue;
|
---|
| 1637 | } else {
|
---|
[331] | 1638 | if ((s->sh_flags & (SHF_ALLOC | SHF_WRITE)) !=
|
---|
[279] | 1639 | (SHF_ALLOC | SHF_WRITE))
|
---|
| 1640 | continue;
|
---|
| 1641 | }
|
---|
| 1642 | if (s == interp) {
|
---|
| 1643 | if (k != 0)
|
---|
| 1644 | continue;
|
---|
| 1645 | } else if (s->sh_type == SHT_DYNSYM ||
|
---|
| 1646 | s->sh_type == SHT_STRTAB ||
|
---|
| 1647 | s->sh_type == SHT_HASH) {
|
---|
| 1648 | if (k != 1)
|
---|
| 1649 | continue;
|
---|
| 1650 | } else if (s->sh_type == SHT_RELX) {
|
---|
| 1651 | if (k != 2)
|
---|
| 1652 | continue;
|
---|
| 1653 | } else if (s->sh_type == SHT_NOBITS) {
|
---|
| 1654 | if (k != 4)
|
---|
| 1655 | continue;
|
---|
| 1656 | } else {
|
---|
| 1657 | if (k != 3)
|
---|
| 1658 | continue;
|
---|
| 1659 | }
|
---|
[331] | 1660 | sec_order[sh_order_index++] = i;
|
---|
[279] | 1661 |
|
---|
| 1662 | /* section matches: we align it and add its size */
|
---|
| 1663 | tmp = addr;
|
---|
[331] | 1664 | addr = (addr + s->sh_addralign - 1) &
|
---|
[279] | 1665 | ~(s->sh_addralign - 1);
|
---|
| 1666 | file_offset += (int) ( addr - tmp );
|
---|
| 1667 | s->sh_offset = file_offset;
|
---|
| 1668 | s->sh_addr = addr;
|
---|
[331] | 1669 |
|
---|
[279] | 1670 | /* update program header infos */
|
---|
| 1671 | if (ph->p_offset == 0) {
|
---|
| 1672 | ph->p_offset = file_offset;
|
---|
| 1673 | ph->p_vaddr = addr;
|
---|
| 1674 | ph->p_paddr = ph->p_vaddr;
|
---|
| 1675 | }
|
---|
| 1676 | /* update dynamic relocation infos */
|
---|
| 1677 | if (s->sh_type == SHT_RELX) {
|
---|
| 1678 | #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
---|
[331] | 1679 | if (!strcmp(strsec->data + s->sh_name, ".rel.got")) {
|
---|
| 1680 | dyninf->rel_addr = addr;
|
---|
| 1681 | dyninf->rel_size += s->sh_size; /* XXX only first rel. */
|
---|
| 1682 | }
|
---|
| 1683 | if (!strcmp(strsec->data + s->sh_name, ".rel.bss")) {
|
---|
| 1684 | dyninf->bss_addr = addr;
|
---|
| 1685 | dyninf->bss_size = s->sh_size; /* XXX only first rel. */
|
---|
| 1686 | }
|
---|
[279] | 1687 | #else
|
---|
[331] | 1688 | if (dyninf->rel_size == 0)
|
---|
| 1689 | dyninf->rel_addr = addr;
|
---|
| 1690 | dyninf->rel_size += s->sh_size;
|
---|
[279] | 1691 | #endif
|
---|
| 1692 | }
|
---|
| 1693 | addr += s->sh_size;
|
---|
| 1694 | if (s->sh_type != SHT_NOBITS)
|
---|
| 1695 | file_offset += s->sh_size;
|
---|
| 1696 | }
|
---|
| 1697 | }
|
---|
[331] | 1698 | if (j == 0) {
|
---|
| 1699 | /* Make the first PT_LOAD segment include the program
|
---|
| 1700 | headers itself (and the ELF header as well), it'll
|
---|
| 1701 | come out with same memory use but will make various
|
---|
| 1702 | tools like binutils strip work better. */
|
---|
| 1703 | ph->p_offset &= ~(ph->p_align - 1);
|
---|
| 1704 | ph->p_vaddr &= ~(ph->p_align - 1);
|
---|
| 1705 | ph->p_paddr &= ~(ph->p_align - 1);
|
---|
| 1706 | }
|
---|
[279] | 1707 | ph->p_filesz = file_offset - ph->p_offset;
|
---|
| 1708 | ph->p_memsz = addr - ph->p_vaddr;
|
---|
| 1709 | ph++;
|
---|
| 1710 | if (j == 0) {
|
---|
| 1711 | if (s1->output_format == TCC_OUTPUT_FORMAT_ELF) {
|
---|
| 1712 | /* if in the middle of a page, we duplicate the page in
|
---|
| 1713 | memory so that one copy is RX and the other is RW */
|
---|
[331] | 1714 | if ((addr & (s_align - 1)) != 0)
|
---|
| 1715 | addr += s_align;
|
---|
[279] | 1716 | } else {
|
---|
[331] | 1717 | addr = (addr + s_align - 1) & ~(s_align - 1);
|
---|
| 1718 | file_offset = (file_offset + s_align - 1) & ~(s_align - 1);
|
---|
[279] | 1719 | }
|
---|
| 1720 | }
|
---|
| 1721 | }
|
---|
[331] | 1722 | }
|
---|
[279] | 1723 |
|
---|
[331] | 1724 | /* all other sections come after */
|
---|
| 1725 | for(i = 1; i < s1->nb_sections; i++) {
|
---|
| 1726 | s = s1->sections[i];
|
---|
| 1727 | if (phnum > 0 && (s->sh_flags & SHF_ALLOC))
|
---|
| 1728 | continue;
|
---|
| 1729 | sec_order[sh_order_index++] = i;
|
---|
[279] | 1730 |
|
---|
[331] | 1731 | file_offset = (file_offset + s->sh_addralign - 1) &
|
---|
| 1732 | ~(s->sh_addralign - 1);
|
---|
| 1733 | s->sh_offset = file_offset;
|
---|
| 1734 | if (s->sh_type != SHT_NOBITS)
|
---|
| 1735 | file_offset += s->sh_size;
|
---|
| 1736 | }
|
---|
[279] | 1737 |
|
---|
[331] | 1738 | return file_offset;
|
---|
| 1739 | }
|
---|
[279] | 1740 |
|
---|
[331] | 1741 | static void fill_unloadable_phdr(ElfW(Phdr) *phdr, int phnum, Section *interp,
|
---|
| 1742 | Section *dynamic)
|
---|
| 1743 | {
|
---|
| 1744 | ElfW(Phdr) *ph;
|
---|
[279] | 1745 |
|
---|
[331] | 1746 | /* if interpreter, then add corresponding program header */
|
---|
| 1747 | if (interp) {
|
---|
| 1748 | ph = &phdr[0];
|
---|
[279] | 1749 |
|
---|
[331] | 1750 | ph->p_type = PT_PHDR;
|
---|
| 1751 | ph->p_offset = sizeof(ElfW(Ehdr));
|
---|
| 1752 | ph->p_filesz = ph->p_memsz = phnum * sizeof(ElfW(Phdr));
|
---|
| 1753 | ph->p_vaddr = interp->sh_addr - ph->p_filesz;
|
---|
| 1754 | ph->p_paddr = ph->p_vaddr;
|
---|
| 1755 | ph->p_flags = PF_R | PF_X;
|
---|
| 1756 | ph->p_align = 4; /* interp->sh_addralign; */
|
---|
| 1757 | ph++;
|
---|
[279] | 1758 |
|
---|
[331] | 1759 | ph->p_type = PT_INTERP;
|
---|
| 1760 | ph->p_offset = interp->sh_offset;
|
---|
| 1761 | ph->p_vaddr = interp->sh_addr;
|
---|
| 1762 | ph->p_paddr = ph->p_vaddr;
|
---|
| 1763 | ph->p_filesz = interp->sh_size;
|
---|
| 1764 | ph->p_memsz = interp->sh_size;
|
---|
| 1765 | ph->p_flags = PF_R;
|
---|
| 1766 | ph->p_align = interp->sh_addralign;
|
---|
| 1767 | }
|
---|
[279] | 1768 |
|
---|
[331] | 1769 | /* if dynamic section, then add corresponding program header */
|
---|
| 1770 | if (dynamic) {
|
---|
| 1771 | ph = &phdr[phnum - 1];
|
---|
[279] | 1772 |
|
---|
[331] | 1773 | ph->p_type = PT_DYNAMIC;
|
---|
| 1774 | ph->p_offset = dynamic->sh_offset;
|
---|
| 1775 | ph->p_vaddr = dynamic->sh_addr;
|
---|
| 1776 | ph->p_paddr = ph->p_vaddr;
|
---|
| 1777 | ph->p_filesz = dynamic->sh_size;
|
---|
| 1778 | ph->p_memsz = dynamic->sh_size;
|
---|
| 1779 | ph->p_flags = PF_R | PF_W;
|
---|
| 1780 | ph->p_align = dynamic->sh_addralign;
|
---|
| 1781 | }
|
---|
| 1782 | }
|
---|
[279] | 1783 |
|
---|
[331] | 1784 | /* Fill the dynamic section with tags describing the address and size of
|
---|
| 1785 | sections */
|
---|
| 1786 | static void fill_dynamic(TCCState *s1, struct dyn_inf *dyninf)
|
---|
| 1787 | {
|
---|
| 1788 | Section *dynamic = dyninf->dynamic;
|
---|
| 1789 |
|
---|
| 1790 | /* put dynamic section entries */
|
---|
| 1791 | put_dt(dynamic, DT_HASH, s1->dynsym->hash->sh_addr);
|
---|
| 1792 | put_dt(dynamic, DT_STRTAB, dyninf->dynstr->sh_addr);
|
---|
| 1793 | put_dt(dynamic, DT_SYMTAB, s1->dynsym->sh_addr);
|
---|
| 1794 | put_dt(dynamic, DT_STRSZ, dyninf->dynstr->data_offset);
|
---|
| 1795 | put_dt(dynamic, DT_SYMENT, sizeof(ElfW(Sym)));
|
---|
| 1796 | #if PTR_SIZE == 8
|
---|
| 1797 | put_dt(dynamic, DT_RELA, dyninf->rel_addr);
|
---|
| 1798 | put_dt(dynamic, DT_RELASZ, dyninf->rel_size);
|
---|
| 1799 | put_dt(dynamic, DT_RELAENT, sizeof(ElfW_Rel));
|
---|
[279] | 1800 | #else
|
---|
| 1801 | #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
|
---|
[331] | 1802 | put_dt(dynamic, DT_PLTGOT, s1->got->sh_addr);
|
---|
| 1803 | put_dt(dynamic, DT_PLTRELSZ, dyninf->rel_size);
|
---|
| 1804 | put_dt(dynamic, DT_JMPREL, dyninf->rel_addr);
|
---|
| 1805 | put_dt(dynamic, DT_PLTREL, DT_REL);
|
---|
| 1806 | put_dt(dynamic, DT_REL, dyninf->bss_addr);
|
---|
| 1807 | put_dt(dynamic, DT_RELSZ, dyninf->bss_size);
|
---|
[279] | 1808 | #else
|
---|
[331] | 1809 | put_dt(dynamic, DT_REL, dyninf->rel_addr);
|
---|
| 1810 | put_dt(dynamic, DT_RELSZ, dyninf->rel_size);
|
---|
| 1811 | put_dt(dynamic, DT_RELENT, sizeof(ElfW_Rel));
|
---|
[279] | 1812 | #endif
|
---|
| 1813 | #endif
|
---|
[331] | 1814 | if (s1->do_debug)
|
---|
| 1815 | put_dt(dynamic, DT_DEBUG, 0);
|
---|
| 1816 | put_dt(dynamic, DT_NULL, 0);
|
---|
| 1817 | }
|
---|
| 1818 |
|
---|
| 1819 | /* Relocate remaining sections and symbols (that is those not related to
|
---|
| 1820 | dynamic linking) */
|
---|
| 1821 | static int final_sections_reloc(TCCState *s1)
|
---|
| 1822 | {
|
---|
| 1823 | int i;
|
---|
| 1824 | Section *s;
|
---|
| 1825 |
|
---|
| 1826 | relocate_syms(s1, s1->symtab, 0);
|
---|
| 1827 |
|
---|
| 1828 | if (s1->nb_errors != 0)
|
---|
| 1829 | return -1;
|
---|
| 1830 |
|
---|
| 1831 | /* relocate sections */
|
---|
| 1832 | /* XXX: ignore sections with allocated relocations ? */
|
---|
| 1833 | for(i = 1; i < s1->nb_sections; i++) {
|
---|
| 1834 | s = s1->sections[i];
|
---|
| 1835 | #if defined(TCC_TARGET_I386) || defined(TCC_MUSL)
|
---|
| 1836 | if (s->reloc && s != s1->got && (s->sh_flags & SHF_ALLOC)) //gr
|
---|
| 1837 | /* On X86 gdb 7.3 works in any case but gdb 6.6 will crash if SHF_ALLOC
|
---|
| 1838 | checking is removed */
|
---|
| 1839 | #else
|
---|
| 1840 | if (s->reloc && s != s1->got)
|
---|
| 1841 | /* On X86_64 gdb 7.3 will crash if SHF_ALLOC checking is present */
|
---|
| 1842 | #endif
|
---|
| 1843 | relocate_section(s1, s);
|
---|
| 1844 | }
|
---|
| 1845 |
|
---|
| 1846 | /* relocate relocation entries if the relocation tables are
|
---|
| 1847 | allocated in the executable */
|
---|
| 1848 | for(i = 1; i < s1->nb_sections; i++) {
|
---|
| 1849 | s = s1->sections[i];
|
---|
| 1850 | if ((s->sh_flags & SHF_ALLOC) &&
|
---|
| 1851 | s->sh_type == SHT_RELX) {
|
---|
| 1852 | relocate_rel(s1, s);
|
---|
[279] | 1853 | }
|
---|
[331] | 1854 | }
|
---|
| 1855 | return 0;
|
---|
| 1856 | }
|
---|
[279] | 1857 |
|
---|
[331] | 1858 | /* Create an ELF file on disk.
|
---|
| 1859 | This function handle ELF specific layout requirements */
|
---|
| 1860 | static void tcc_output_elf(TCCState *s1, FILE *f, int phnum, ElfW(Phdr) *phdr,
|
---|
| 1861 | int file_offset, int *sec_order)
|
---|
| 1862 | {
|
---|
| 1863 | int i, shnum, offset, size, file_type;
|
---|
| 1864 | Section *s;
|
---|
| 1865 | ElfW(Ehdr) ehdr;
|
---|
| 1866 | ElfW(Shdr) shdr, *sh;
|
---|
| 1867 |
|
---|
| 1868 | file_type = s1->output_type;
|
---|
| 1869 | shnum = s1->nb_sections;
|
---|
| 1870 |
|
---|
| 1871 | memset(&ehdr, 0, sizeof(ehdr));
|
---|
| 1872 |
|
---|
| 1873 | if (phnum > 0) {
|
---|
[279] | 1874 | ehdr.e_phentsize = sizeof(ElfW(Phdr));
|
---|
| 1875 | ehdr.e_phnum = phnum;
|
---|
| 1876 | ehdr.e_phoff = sizeof(ElfW(Ehdr));
|
---|
| 1877 | }
|
---|
| 1878 |
|
---|
[331] | 1879 | /* align to 4 */
|
---|
| 1880 | file_offset = (file_offset + 3) & -4;
|
---|
| 1881 |
|
---|
| 1882 | /* fill header */
|
---|
| 1883 | ehdr.e_ident[0] = ELFMAG0;
|
---|
| 1884 | ehdr.e_ident[1] = ELFMAG1;
|
---|
| 1885 | ehdr.e_ident[2] = ELFMAG2;
|
---|
| 1886 | ehdr.e_ident[3] = ELFMAG3;
|
---|
| 1887 | ehdr.e_ident[4] = ELFCLASSW;
|
---|
| 1888 | ehdr.e_ident[5] = ELFDATA2LSB;
|
---|
| 1889 | ehdr.e_ident[6] = EV_CURRENT;
|
---|
| 1890 | #if !defined(TCC_TARGET_PE) && (defined(__FreeBSD__) || defined(__FreeBSD_kernel__))
|
---|
| 1891 | /* FIXME: should set only for freebsd _target_, but we exclude only PE target */
|
---|
| 1892 | ehdr.e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
|
---|
| 1893 | #endif
|
---|
| 1894 | #ifdef TCC_TARGET_ARM
|
---|
| 1895 | #ifdef TCC_ARM_EABI
|
---|
| 1896 | ehdr.e_ident[EI_OSABI] = 0;
|
---|
| 1897 | ehdr.e_flags = EF_ARM_EABI_VER4;
|
---|
| 1898 | if (file_type == TCC_OUTPUT_EXE || file_type == TCC_OUTPUT_DLL)
|
---|
| 1899 | ehdr.e_flags |= EF_ARM_HASENTRY;
|
---|
| 1900 | if (s1->float_abi == ARM_HARD_FLOAT)
|
---|
| 1901 | ehdr.e_flags |= EF_ARM_VFP_FLOAT;
|
---|
| 1902 | else
|
---|
| 1903 | ehdr.e_flags |= EF_ARM_SOFT_FLOAT;
|
---|
| 1904 | #else
|
---|
| 1905 | ehdr.e_ident[EI_OSABI] = ELFOSABI_ARM;
|
---|
| 1906 | #endif
|
---|
| 1907 | #endif
|
---|
| 1908 | switch(file_type) {
|
---|
| 1909 | default:
|
---|
| 1910 | case TCC_OUTPUT_EXE:
|
---|
| 1911 | ehdr.e_type = ET_EXEC;
|
---|
| 1912 | ehdr.e_entry = get_elf_sym_addr(s1, "_start", 1);
|
---|
| 1913 | break;
|
---|
| 1914 | case TCC_OUTPUT_DLL:
|
---|
| 1915 | ehdr.e_type = ET_DYN;
|
---|
| 1916 | ehdr.e_entry = text_section->sh_addr; /* XXX: is it correct ? */
|
---|
| 1917 | break;
|
---|
| 1918 | case TCC_OUTPUT_OBJ:
|
---|
| 1919 | ehdr.e_type = ET_REL;
|
---|
| 1920 | break;
|
---|
[279] | 1921 | }
|
---|
[331] | 1922 | ehdr.e_machine = EM_TCC_TARGET;
|
---|
| 1923 | ehdr.e_version = EV_CURRENT;
|
---|
| 1924 | ehdr.e_shoff = file_offset;
|
---|
| 1925 | ehdr.e_ehsize = sizeof(ElfW(Ehdr));
|
---|
| 1926 | ehdr.e_shentsize = sizeof(ElfW(Shdr));
|
---|
| 1927 | ehdr.e_shnum = shnum;
|
---|
| 1928 | ehdr.e_shstrndx = shnum - 1;
|
---|
[279] | 1929 |
|
---|
[331] | 1930 | fwrite(&ehdr, 1, sizeof(ElfW(Ehdr)), f);
|
---|
| 1931 | fwrite(phdr, 1, phnum * sizeof(ElfW(Phdr)), f);
|
---|
| 1932 | offset = sizeof(ElfW(Ehdr)) + phnum * sizeof(ElfW(Phdr));
|
---|
[279] | 1933 |
|
---|
[331] | 1934 | sort_syms(s1, symtab_section);
|
---|
| 1935 | for(i = 1; i < s1->nb_sections; i++) {
|
---|
| 1936 | s = s1->sections[sec_order[i]];
|
---|
| 1937 | if (s->sh_type != SHT_NOBITS) {
|
---|
| 1938 | while (offset < s->sh_offset) {
|
---|
| 1939 | fputc(0, f);
|
---|
| 1940 | offset++;
|
---|
[279] | 1941 | }
|
---|
[331] | 1942 | size = s->sh_size;
|
---|
| 1943 | if (size)
|
---|
| 1944 | fwrite(s->data, 1, size, f);
|
---|
| 1945 | offset += size;
|
---|
[279] | 1946 | }
|
---|
[331] | 1947 | }
|
---|
[279] | 1948 |
|
---|
[331] | 1949 | /* output section headers */
|
---|
| 1950 | while (offset < ehdr.e_shoff) {
|
---|
| 1951 | fputc(0, f);
|
---|
| 1952 | offset++;
|
---|
[279] | 1953 | }
|
---|
| 1954 |
|
---|
[331] | 1955 | for(i = 0; i < s1->nb_sections; i++) {
|
---|
| 1956 | sh = &shdr;
|
---|
| 1957 | memset(sh, 0, sizeof(ElfW(Shdr)));
|
---|
| 1958 | s = s1->sections[i];
|
---|
| 1959 | if (s) {
|
---|
| 1960 | sh->sh_name = s->sh_name;
|
---|
| 1961 | sh->sh_type = s->sh_type;
|
---|
| 1962 | sh->sh_flags = s->sh_flags;
|
---|
| 1963 | sh->sh_entsize = s->sh_entsize;
|
---|
| 1964 | sh->sh_info = s->sh_info;
|
---|
| 1965 | if (s->link)
|
---|
| 1966 | sh->sh_link = s->link->sh_num;
|
---|
| 1967 | sh->sh_addralign = s->sh_addralign;
|
---|
| 1968 | sh->sh_addr = s->sh_addr;
|
---|
| 1969 | sh->sh_offset = s->sh_offset;
|
---|
| 1970 | sh->sh_size = s->sh_size;
|
---|
| 1971 | }
|
---|
| 1972 | fwrite(sh, 1, sizeof(ElfW(Shdr)), f);
|
---|
| 1973 | }
|
---|
| 1974 | }
|
---|
| 1975 |
|
---|
| 1976 | /* Write an elf, coff or "binary" file */
|
---|
| 1977 | static int tcc_write_elf_file(TCCState *s1, const char *filename, int phnum,
|
---|
| 1978 | ElfW(Phdr) *phdr, int file_offset, int *sec_order)
|
---|
| 1979 | {
|
---|
| 1980 | int fd, mode, file_type;
|
---|
| 1981 | FILE *f;
|
---|
| 1982 |
|
---|
| 1983 | file_type = s1->output_type;
|
---|
[279] | 1984 | if (file_type == TCC_OUTPUT_OBJ)
|
---|
| 1985 | mode = 0666;
|
---|
| 1986 | else
|
---|
| 1987 | mode = 0777;
|
---|
| 1988 | unlink(filename);
|
---|
[331] | 1989 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, mode);
|
---|
[279] | 1990 | if (fd < 0) {
|
---|
| 1991 | tcc_error_noabort("could not write '%s'", filename);
|
---|
[331] | 1992 | return -1;
|
---|
[279] | 1993 | }
|
---|
| 1994 | f = fdopen(fd, "wb");
|
---|
| 1995 | if (s1->verbose)
|
---|
| 1996 | printf("<- %s\n", filename);
|
---|
| 1997 |
|
---|
| 1998 | #ifdef TCC_TARGET_COFF
|
---|
[331] | 1999 | if (s1->output_format == TCC_OUTPUT_FORMAT_COFF)
|
---|
[279] | 2000 | tcc_output_coff(s1, f);
|
---|
[331] | 2001 | else
|
---|
[279] | 2002 | #endif
|
---|
[331] | 2003 | if (s1->output_format == TCC_OUTPUT_FORMAT_ELF)
|
---|
| 2004 | tcc_output_elf(s1, f, phnum, phdr, file_offset, sec_order);
|
---|
| 2005 | else
|
---|
| 2006 | tcc_output_binary(s1, f, sec_order);
|
---|
| 2007 | fclose(f);
|
---|
[279] | 2008 |
|
---|
[331] | 2009 | return 0;
|
---|
| 2010 | }
|
---|
| 2011 |
|
---|
| 2012 | /* Sort section headers by assigned sh_addr, remove sections
|
---|
| 2013 | that we aren't going to output. */
|
---|
| 2014 | static void tidy_section_headers(TCCState *s1, int *sec_order)
|
---|
| 2015 | {
|
---|
| 2016 | int i, nnew, l, *backmap;
|
---|
| 2017 | Section **snew, *s;
|
---|
| 2018 | ElfW(Sym) *sym;
|
---|
| 2019 |
|
---|
| 2020 | snew = tcc_malloc(s1->nb_sections * sizeof(snew[0]));
|
---|
| 2021 | backmap = tcc_malloc(s1->nb_sections * sizeof(backmap[0]));
|
---|
| 2022 | for (i = 0, nnew = 0, l = s1->nb_sections; i < s1->nb_sections; i++) {
|
---|
| 2023 | s = s1->sections[sec_order[i]];
|
---|
| 2024 | if (!i || s->sh_name) {
|
---|
| 2025 | backmap[sec_order[i]] = nnew;
|
---|
| 2026 | snew[nnew] = s;
|
---|
| 2027 | ++nnew;
|
---|
| 2028 | } else {
|
---|
| 2029 | backmap[sec_order[i]] = 0;
|
---|
| 2030 | snew[--l] = s;
|
---|
| 2031 | }
|
---|
| 2032 | }
|
---|
| 2033 | for (i = 0; i < nnew; i++) {
|
---|
| 2034 | s = snew[i];
|
---|
| 2035 | if (s) {
|
---|
| 2036 | s->sh_num = i;
|
---|
| 2037 | if (s->sh_type == SHT_RELX)
|
---|
| 2038 | s->sh_info = backmap[s->sh_info];
|
---|
| 2039 | }
|
---|
| 2040 | }
|
---|
| 2041 |
|
---|
| 2042 | for_each_elem(symtab_section, 1, sym, ElfW(Sym))
|
---|
| 2043 | if (sym->st_shndx != SHN_UNDEF && sym->st_shndx < SHN_LORESERVE)
|
---|
| 2044 | sym->st_shndx = backmap[sym->st_shndx];
|
---|
| 2045 | if( !s1->static_link ) {
|
---|
| 2046 | for_each_elem(s1->dynsym, 1, sym, ElfW(Sym))
|
---|
| 2047 | if (sym->st_shndx != SHN_UNDEF && sym->st_shndx < SHN_LORESERVE)
|
---|
| 2048 | sym->st_shndx = backmap[sym->st_shndx];
|
---|
| 2049 | }
|
---|
| 2050 | for (i = 0; i < s1->nb_sections; i++)
|
---|
| 2051 | sec_order[i] = i;
|
---|
| 2052 | tcc_free(s1->sections);
|
---|
| 2053 | s1->sections = snew;
|
---|
| 2054 | s1->nb_sections = nnew;
|
---|
| 2055 | tcc_free(backmap);
|
---|
| 2056 | }
|
---|
| 2057 |
|
---|
| 2058 | /* Output an elf, coff or binary file */
|
---|
| 2059 | /* XXX: suppress unneeded sections */
|
---|
| 2060 | static int elf_output_file(TCCState *s1, const char *filename)
|
---|
| 2061 | {
|
---|
| 2062 | int i, ret, phnum, shnum, file_type, file_offset, *sec_order;
|
---|
| 2063 | struct dyn_inf dyninf = {0};
|
---|
| 2064 | ElfW(Phdr) *phdr;
|
---|
| 2065 | ElfW(Sym) *sym;
|
---|
| 2066 | Section *strsec, *interp, *dynamic, *dynstr;
|
---|
| 2067 | int textrel;
|
---|
| 2068 |
|
---|
| 2069 | file_type = s1->output_type;
|
---|
| 2070 | s1->nb_errors = 0;
|
---|
| 2071 | ret = -1;
|
---|
| 2072 | phdr = NULL;
|
---|
| 2073 | sec_order = NULL;
|
---|
| 2074 | interp = dynamic = dynstr = NULL; /* avoid warning */
|
---|
| 2075 | textrel = 0;
|
---|
| 2076 |
|
---|
| 2077 | if (file_type != TCC_OUTPUT_OBJ) {
|
---|
| 2078 | /* if linking, also link in runtime libraries (libc, libgcc, etc.) */
|
---|
| 2079 | tcc_add_runtime(s1);
|
---|
| 2080 | resolve_common_syms(s1);
|
---|
| 2081 |
|
---|
| 2082 | if (!s1->static_link) {
|
---|
| 2083 | if (file_type == TCC_OUTPUT_EXE) {
|
---|
| 2084 | char *ptr;
|
---|
| 2085 | /* allow override the dynamic loader */
|
---|
| 2086 | const char *elfint = getenv("LD_SO");
|
---|
| 2087 | if (elfint == NULL)
|
---|
| 2088 | elfint = DEFAULT_ELFINTERP(s1);
|
---|
| 2089 | /* add interpreter section only if executable */
|
---|
| 2090 | interp = new_section(s1, ".interp", SHT_PROGBITS, SHF_ALLOC);
|
---|
| 2091 | interp->sh_addralign = 1;
|
---|
| 2092 | ptr = section_ptr_add(interp, 1 + strlen(elfint));
|
---|
| 2093 | strcpy(ptr, elfint);
|
---|
[279] | 2094 | }
|
---|
[331] | 2095 |
|
---|
| 2096 | /* add dynamic symbol table */
|
---|
| 2097 | s1->dynsym = new_symtab(s1, ".dynsym", SHT_DYNSYM, SHF_ALLOC,
|
---|
| 2098 | ".dynstr",
|
---|
| 2099 | ".hash", SHF_ALLOC);
|
---|
| 2100 | dynstr = s1->dynsym->link;
|
---|
| 2101 |
|
---|
| 2102 | /* add dynamic section */
|
---|
| 2103 | dynamic = new_section(s1, ".dynamic", SHT_DYNAMIC,
|
---|
| 2104 | SHF_ALLOC | SHF_WRITE);
|
---|
| 2105 | dynamic->link = dynstr;
|
---|
| 2106 | dynamic->sh_entsize = sizeof(ElfW(Dyn));
|
---|
| 2107 |
|
---|
| 2108 | build_got(s1);
|
---|
| 2109 |
|
---|
| 2110 | if (file_type == TCC_OUTPUT_EXE) {
|
---|
| 2111 | bind_exe_dynsyms(s1);
|
---|
| 2112 | if (s1->nb_errors)
|
---|
| 2113 | goto the_end;
|
---|
| 2114 | bind_libs_dynsyms(s1);
|
---|
| 2115 | } else {
|
---|
| 2116 | /* shared library case: simply export all global symbols */
|
---|
| 2117 | export_global_syms(s1);
|
---|
| 2118 | }
|
---|
[279] | 2119 | }
|
---|
[331] | 2120 | build_got_entries(s1);
|
---|
| 2121 | }
|
---|
[279] | 2122 |
|
---|
[331] | 2123 | /* we add a section for symbols */
|
---|
| 2124 | strsec = new_section(s1, ".shstrtab", SHT_STRTAB, 0);
|
---|
| 2125 | put_elf_str(strsec, "");
|
---|
| 2126 |
|
---|
| 2127 | /* Allocate strings for section names */
|
---|
| 2128 | textrel = alloc_sec_names(s1, file_type, strsec);
|
---|
| 2129 |
|
---|
| 2130 | if (dynamic) {
|
---|
| 2131 | /* add a list of needed dlls */
|
---|
| 2132 | for(i = 0; i < s1->nb_loaded_dlls; i++) {
|
---|
| 2133 | DLLReference *dllref = s1->loaded_dlls[i];
|
---|
| 2134 | if (dllref->level == 0)
|
---|
| 2135 | put_dt(dynamic, DT_NEEDED, put_elf_str(dynstr, dllref->name));
|
---|
[279] | 2136 | }
|
---|
[331] | 2137 |
|
---|
| 2138 | if (s1->rpath)
|
---|
| 2139 | put_dt(dynamic, s1->enable_new_dtags ? DT_RUNPATH : DT_RPATH,
|
---|
| 2140 | put_elf_str(dynstr, s1->rpath));
|
---|
| 2141 |
|
---|
| 2142 | if (file_type == TCC_OUTPUT_DLL) {
|
---|
| 2143 | if (s1->soname)
|
---|
| 2144 | put_dt(dynamic, DT_SONAME, put_elf_str(dynstr, s1->soname));
|
---|
| 2145 | /* XXX: currently, since we do not handle PIC code, we
|
---|
| 2146 | must relocate the readonly segments */
|
---|
| 2147 | if (textrel)
|
---|
| 2148 | put_dt(dynamic, DT_TEXTREL, 0);
|
---|
| 2149 | }
|
---|
| 2150 |
|
---|
| 2151 | if (s1->symbolic)
|
---|
| 2152 | put_dt(dynamic, DT_SYMBOLIC, 0);
|
---|
| 2153 |
|
---|
| 2154 | dyninf.dynamic = dynamic;
|
---|
| 2155 | dyninf.dynstr = dynstr;
|
---|
| 2156 | /* remember offset and reserve space for 2nd call below */
|
---|
| 2157 | dyninf.data_offset = dynamic->data_offset;
|
---|
| 2158 | fill_dynamic(s1, &dyninf);
|
---|
| 2159 | dynamic->sh_size = dynamic->data_offset;
|
---|
| 2160 | dynstr->sh_size = dynstr->data_offset;
|
---|
| 2161 | }
|
---|
| 2162 |
|
---|
| 2163 | /* compute number of program headers */
|
---|
| 2164 | if (file_type == TCC_OUTPUT_OBJ)
|
---|
| 2165 | phnum = 0;
|
---|
| 2166 | else if (file_type == TCC_OUTPUT_DLL)
|
---|
| 2167 | phnum = 3;
|
---|
| 2168 | else if (s1->static_link)
|
---|
| 2169 | phnum = 2;
|
---|
| 2170 | else
|
---|
| 2171 | phnum = 5;
|
---|
| 2172 |
|
---|
| 2173 | /* allocate program segment headers */
|
---|
| 2174 | phdr = tcc_mallocz(phnum * sizeof(ElfW(Phdr)));
|
---|
| 2175 |
|
---|
| 2176 | /* compute number of sections */
|
---|
| 2177 | shnum = s1->nb_sections;
|
---|
| 2178 |
|
---|
| 2179 | /* this array is used to reorder sections in the output file */
|
---|
| 2180 | sec_order = tcc_malloc(sizeof(int) * shnum);
|
---|
| 2181 | sec_order[0] = 0;
|
---|
| 2182 |
|
---|
| 2183 | /* compute section to program header mapping */
|
---|
| 2184 | file_offset = layout_sections(s1, phdr, phnum, interp, strsec, &dyninf,
|
---|
| 2185 | sec_order);
|
---|
| 2186 |
|
---|
| 2187 | /* Fill remaining program header and finalize relocation related to dynamic
|
---|
| 2188 | linking. */
|
---|
| 2189 | if (file_type != TCC_OUTPUT_OBJ) {
|
---|
| 2190 | fill_unloadable_phdr(phdr, phnum, interp, dynamic);
|
---|
| 2191 | if (dynamic) {
|
---|
| 2192 | dynamic->data_offset = dyninf.data_offset;
|
---|
| 2193 | fill_dynamic(s1, &dyninf);
|
---|
| 2194 |
|
---|
| 2195 | /* put in GOT the dynamic section address and relocate PLT */
|
---|
| 2196 | write32le(s1->got->data, dynamic->sh_addr);
|
---|
| 2197 | if (file_type == TCC_OUTPUT_EXE
|
---|
| 2198 | || (RELOCATE_DLLPLT && file_type == TCC_OUTPUT_DLL))
|
---|
| 2199 | relocate_plt(s1);
|
---|
| 2200 |
|
---|
| 2201 | /* relocate symbols in .dynsym now that final addresses are known */
|
---|
| 2202 | for_each_elem(s1->dynsym, 1, sym, ElfW(Sym)) {
|
---|
| 2203 | if (sym->st_shndx != SHN_UNDEF && sym->st_shndx < SHN_LORESERVE) {
|
---|
| 2204 | /* do symbol relocation */
|
---|
| 2205 | sym->st_value += s1->sections[sym->st_shndx]->sh_addr;
|
---|
| 2206 | }
|
---|
[279] | 2207 | }
|
---|
| 2208 | }
|
---|
[331] | 2209 |
|
---|
| 2210 | /* if building executable or DLL, then relocate each section
|
---|
| 2211 | except the GOT which is already relocated */
|
---|
| 2212 | ret = final_sections_reloc(s1);
|
---|
| 2213 | if (ret)
|
---|
| 2214 | goto the_end;
|
---|
| 2215 | tidy_section_headers(s1, sec_order);
|
---|
| 2216 |
|
---|
| 2217 | /* Perform relocation to GOT or PLT entries */
|
---|
| 2218 | if (file_type == TCC_OUTPUT_EXE && s1->static_link)
|
---|
| 2219 | fill_got(s1);
|
---|
| 2220 | else if (s1->got)
|
---|
| 2221 | fill_local_got_entries(s1);
|
---|
[279] | 2222 | }
|
---|
| 2223 |
|
---|
[331] | 2224 | /* Create the ELF file with name 'filename' */
|
---|
| 2225 | ret = tcc_write_elf_file(s1, filename, phnum, phdr, file_offset, sec_order);
|
---|
| 2226 | s1->nb_sections = shnum;
|
---|
[279] | 2227 | the_end:
|
---|
[331] | 2228 | tcc_free(sec_order);
|
---|
[279] | 2229 | tcc_free(phdr);
|
---|
| 2230 | return ret;
|
---|
| 2231 | }
|
---|
| 2232 |
|
---|
| 2233 | LIBTCCAPI int tcc_output_file(TCCState *s, const char *filename)
|
---|
| 2234 | {
|
---|
| 2235 | int ret;
|
---|
| 2236 | #ifdef TCC_TARGET_PE
|
---|
| 2237 | if (s->output_type != TCC_OUTPUT_OBJ) {
|
---|
| 2238 | ret = pe_output_file(s, filename);
|
---|
| 2239 | } else
|
---|
| 2240 | #endif
|
---|
| 2241 | ret = elf_output_file(s, filename);
|
---|
| 2242 | return ret;
|
---|
| 2243 | }
|
---|
| 2244 |
|
---|
| 2245 | static void *load_data(int fd, unsigned long file_offset, unsigned long size)
|
---|
| 2246 | {
|
---|
| 2247 | void *data;
|
---|
| 2248 |
|
---|
| 2249 | data = tcc_malloc(size);
|
---|
| 2250 | lseek(fd, file_offset, SEEK_SET);
|
---|
| 2251 | read(fd, data, size);
|
---|
| 2252 | return data;
|
---|
| 2253 | }
|
---|
| 2254 |
|
---|
| 2255 | typedef struct SectionMergeInfo {
|
---|
| 2256 | Section *s; /* corresponding existing section */
|
---|
| 2257 | unsigned long offset; /* offset of the new section in the existing section */
|
---|
| 2258 | uint8_t new_section; /* true if section 's' was added */
|
---|
| 2259 | uint8_t link_once; /* true if link once section */
|
---|
| 2260 | } SectionMergeInfo;
|
---|
| 2261 |
|
---|
[331] | 2262 | ST_FUNC int tcc_object_type(int fd, ElfW(Ehdr) *h)
|
---|
| 2263 | {
|
---|
| 2264 | int size = read(fd, h, sizeof *h);
|
---|
| 2265 | if (size == sizeof *h && 0 == memcmp(h, ELFMAG, 4)) {
|
---|
| 2266 | if (h->e_type == ET_REL)
|
---|
| 2267 | return AFF_BINTYPE_REL;
|
---|
| 2268 | if (h->e_type == ET_DYN)
|
---|
| 2269 | return AFF_BINTYPE_DYN;
|
---|
| 2270 | } else if (size >= 8) {
|
---|
| 2271 | if (0 == memcmp(h, ARMAG, 8))
|
---|
| 2272 | return AFF_BINTYPE_AR;
|
---|
| 2273 | #ifdef TCC_TARGET_COFF
|
---|
| 2274 | if (((struct filehdr*)h)->f_magic == COFF_C67_MAGIC)
|
---|
| 2275 | return AFF_BINTYPE_C67;
|
---|
| 2276 | #endif
|
---|
| 2277 | }
|
---|
| 2278 | return 0;
|
---|
| 2279 | }
|
---|
| 2280 |
|
---|
[279] | 2281 | /* load an object file and merge it with current files */
|
---|
| 2282 | /* XXX: handle correctly stab (debug) info */
|
---|
[331] | 2283 | ST_FUNC int tcc_load_object_file(TCCState *s1,
|
---|
[279] | 2284 | int fd, unsigned long file_offset)
|
---|
[331] | 2285 | {
|
---|
[279] | 2286 | ElfW(Ehdr) ehdr;
|
---|
| 2287 | ElfW(Shdr) *shdr, *sh;
|
---|
[331] | 2288 | int size, i, j, offset, offseti, nb_syms, sym_index, ret, seencompressed;
|
---|
[279] | 2289 | unsigned char *strsec, *strtab;
|
---|
| 2290 | int *old_to_new_syms;
|
---|
| 2291 | char *sh_name, *name;
|
---|
| 2292 | SectionMergeInfo *sm_table, *sm;
|
---|
| 2293 | ElfW(Sym) *sym, *symtab;
|
---|
[331] | 2294 | ElfW_Rel *rel;
|
---|
[279] | 2295 | Section *s;
|
---|
| 2296 |
|
---|
| 2297 | int stab_index;
|
---|
| 2298 | int stabstr_index;
|
---|
| 2299 |
|
---|
| 2300 | stab_index = stabstr_index = 0;
|
---|
| 2301 |
|
---|
[331] | 2302 | lseek(fd, file_offset, SEEK_SET);
|
---|
| 2303 | if (tcc_object_type(fd, &ehdr) != AFF_BINTYPE_REL)
|
---|
[279] | 2304 | goto fail1;
|
---|
| 2305 | /* test CPU specific stuff */
|
---|
| 2306 | if (ehdr.e_ident[5] != ELFDATA2LSB ||
|
---|
| 2307 | ehdr.e_machine != EM_TCC_TARGET) {
|
---|
| 2308 | fail1:
|
---|
| 2309 | tcc_error_noabort("invalid object file");
|
---|
| 2310 | return -1;
|
---|
| 2311 | }
|
---|
| 2312 | /* read sections */
|
---|
[331] | 2313 | shdr = load_data(fd, file_offset + ehdr.e_shoff,
|
---|
[279] | 2314 | sizeof(ElfW(Shdr)) * ehdr.e_shnum);
|
---|
| 2315 | sm_table = tcc_mallocz(sizeof(SectionMergeInfo) * ehdr.e_shnum);
|
---|
[331] | 2316 |
|
---|
[279] | 2317 | /* load section names */
|
---|
| 2318 | sh = &shdr[ehdr.e_shstrndx];
|
---|
| 2319 | strsec = load_data(fd, file_offset + sh->sh_offset, sh->sh_size);
|
---|
| 2320 |
|
---|
| 2321 | /* load symtab and strtab */
|
---|
| 2322 | old_to_new_syms = NULL;
|
---|
| 2323 | symtab = NULL;
|
---|
| 2324 | strtab = NULL;
|
---|
| 2325 | nb_syms = 0;
|
---|
[331] | 2326 | seencompressed = 0;
|
---|
[279] | 2327 | for(i = 1; i < ehdr.e_shnum; i++) {
|
---|
| 2328 | sh = &shdr[i];
|
---|
| 2329 | if (sh->sh_type == SHT_SYMTAB) {
|
---|
| 2330 | if (symtab) {
|
---|
| 2331 | tcc_error_noabort("object must contain only one symtab");
|
---|
| 2332 | fail:
|
---|
| 2333 | ret = -1;
|
---|
| 2334 | goto the_end;
|
---|
| 2335 | }
|
---|
| 2336 | nb_syms = sh->sh_size / sizeof(ElfW(Sym));
|
---|
| 2337 | symtab = load_data(fd, file_offset + sh->sh_offset, sh->sh_size);
|
---|
| 2338 | sm_table[i].s = symtab_section;
|
---|
| 2339 |
|
---|
| 2340 | /* now load strtab */
|
---|
| 2341 | sh = &shdr[sh->sh_link];
|
---|
| 2342 | strtab = load_data(fd, file_offset + sh->sh_offset, sh->sh_size);
|
---|
| 2343 | }
|
---|
[331] | 2344 | if (sh->sh_flags & SHF_COMPRESSED)
|
---|
| 2345 | seencompressed = 1;
|
---|
[279] | 2346 | }
|
---|
[331] | 2347 |
|
---|
[279] | 2348 | /* now examine each section and try to merge its content with the
|
---|
| 2349 | ones in memory */
|
---|
| 2350 | for(i = 1; i < ehdr.e_shnum; i++) {
|
---|
| 2351 | /* no need to examine section name strtab */
|
---|
| 2352 | if (i == ehdr.e_shstrndx)
|
---|
| 2353 | continue;
|
---|
| 2354 | sh = &shdr[i];
|
---|
[331] | 2355 | sh_name = (char *) strsec + sh->sh_name;
|
---|
[279] | 2356 | /* ignore sections types we do not handle */
|
---|
| 2357 | if (sh->sh_type != SHT_PROGBITS &&
|
---|
[331] | 2358 | sh->sh_type != SHT_RELX &&
|
---|
[279] | 2359 | #ifdef TCC_ARM_EABI
|
---|
| 2360 | sh->sh_type != SHT_ARM_EXIDX &&
|
---|
| 2361 | #endif
|
---|
[331] | 2362 | sh->sh_type != SHT_NOBITS &&
|
---|
[279] | 2363 | sh->sh_type != SHT_PREINIT_ARRAY &&
|
---|
| 2364 | sh->sh_type != SHT_INIT_ARRAY &&
|
---|
| 2365 | sh->sh_type != SHT_FINI_ARRAY &&
|
---|
| 2366 | strcmp(sh_name, ".stabstr")
|
---|
| 2367 | )
|
---|
| 2368 | continue;
|
---|
[331] | 2369 | if (seencompressed
|
---|
| 2370 | && (!strncmp(sh_name, ".debug_", sizeof(".debug_")-1)
|
---|
| 2371 | || (sh->sh_type == SHT_RELX
|
---|
| 2372 | && !strncmp((char*)strsec + shdr[sh->sh_info].sh_name,
|
---|
| 2373 | ".debug_", sizeof(".debug_")-1))))
|
---|
| 2374 | continue;
|
---|
[279] | 2375 | if (sh->sh_addralign < 1)
|
---|
| 2376 | sh->sh_addralign = 1;
|
---|
| 2377 | /* find corresponding section, if any */
|
---|
| 2378 | for(j = 1; j < s1->nb_sections;j++) {
|
---|
| 2379 | s = s1->sections[j];
|
---|
| 2380 | if (!strcmp(s->name, sh_name)) {
|
---|
[331] | 2381 | if (!strncmp(sh_name, ".gnu.linkonce",
|
---|
[279] | 2382 | sizeof(".gnu.linkonce") - 1)) {
|
---|
| 2383 | /* if a 'linkonce' section is already present, we
|
---|
| 2384 | do not add it again. It is a little tricky as
|
---|
| 2385 | symbols can still be defined in
|
---|
| 2386 | it. */
|
---|
| 2387 | sm_table[i].link_once = 1;
|
---|
| 2388 | goto next;
|
---|
| 2389 | } else {
|
---|
| 2390 | goto found;
|
---|
| 2391 | }
|
---|
| 2392 | }
|
---|
| 2393 | }
|
---|
| 2394 | /* not found: create new section */
|
---|
[331] | 2395 | s = new_section(s1, sh_name, sh->sh_type, sh->sh_flags & ~SHF_GROUP);
|
---|
[279] | 2396 | /* take as much info as possible from the section. sh_link and
|
---|
| 2397 | sh_info will be updated later */
|
---|
| 2398 | s->sh_addralign = sh->sh_addralign;
|
---|
| 2399 | s->sh_entsize = sh->sh_entsize;
|
---|
| 2400 | sm_table[i].new_section = 1;
|
---|
| 2401 | found:
|
---|
| 2402 | if (sh->sh_type != s->sh_type) {
|
---|
| 2403 | tcc_error_noabort("invalid section type");
|
---|
| 2404 | goto fail;
|
---|
| 2405 | }
|
---|
| 2406 |
|
---|
| 2407 | /* align start of section */
|
---|
| 2408 | offset = s->data_offset;
|
---|
| 2409 |
|
---|
| 2410 | if (0 == strcmp(sh_name, ".stab")) {
|
---|
| 2411 | stab_index = i;
|
---|
| 2412 | goto no_align;
|
---|
| 2413 | }
|
---|
| 2414 | if (0 == strcmp(sh_name, ".stabstr")) {
|
---|
| 2415 | stabstr_index = i;
|
---|
| 2416 | goto no_align;
|
---|
| 2417 | }
|
---|
| 2418 |
|
---|
| 2419 | size = sh->sh_addralign - 1;
|
---|
| 2420 | offset = (offset + size) & ~size;
|
---|
| 2421 | if (sh->sh_addralign > s->sh_addralign)
|
---|
| 2422 | s->sh_addralign = sh->sh_addralign;
|
---|
| 2423 | s->data_offset = offset;
|
---|
| 2424 | no_align:
|
---|
| 2425 | sm_table[i].offset = offset;
|
---|
| 2426 | sm_table[i].s = s;
|
---|
| 2427 | /* concatenate sections */
|
---|
| 2428 | size = sh->sh_size;
|
---|
| 2429 | if (sh->sh_type != SHT_NOBITS) {
|
---|
| 2430 | unsigned char *ptr;
|
---|
| 2431 | lseek(fd, file_offset + sh->sh_offset, SEEK_SET);
|
---|
| 2432 | ptr = section_ptr_add(s, size);
|
---|
| 2433 | read(fd, ptr, size);
|
---|
| 2434 | } else {
|
---|
| 2435 | s->data_offset += size;
|
---|
| 2436 | }
|
---|
| 2437 | next: ;
|
---|
| 2438 | }
|
---|
| 2439 |
|
---|
[331] | 2440 | /* gr relocate stab strings */
|
---|
[279] | 2441 | if (stab_index && stabstr_index) {
|
---|
| 2442 | Stab_Sym *a, *b;
|
---|
| 2443 | unsigned o;
|
---|
| 2444 | s = sm_table[stab_index].s;
|
---|
| 2445 | a = (Stab_Sym *)(s->data + sm_table[stab_index].offset);
|
---|
| 2446 | b = (Stab_Sym *)(s->data + s->data_offset);
|
---|
| 2447 | o = sm_table[stabstr_index].offset;
|
---|
[331] | 2448 | while (a < b)
|
---|
[279] | 2449 | a->n_strx += o, a++;
|
---|
| 2450 | }
|
---|
| 2451 |
|
---|
| 2452 | /* second short pass to update sh_link and sh_info fields of new
|
---|
| 2453 | sections */
|
---|
| 2454 | for(i = 1; i < ehdr.e_shnum; i++) {
|
---|
| 2455 | s = sm_table[i].s;
|
---|
| 2456 | if (!s || !sm_table[i].new_section)
|
---|
| 2457 | continue;
|
---|
| 2458 | sh = &shdr[i];
|
---|
| 2459 | if (sh->sh_link > 0)
|
---|
| 2460 | s->link = sm_table[sh->sh_link].s;
|
---|
| 2461 | if (sh->sh_type == SHT_RELX) {
|
---|
| 2462 | s->sh_info = sm_table[sh->sh_info].s->sh_num;
|
---|
| 2463 | /* update backward link */
|
---|
| 2464 | s1->sections[s->sh_info]->reloc = s;
|
---|
| 2465 | }
|
---|
| 2466 | }
|
---|
| 2467 | sm = sm_table;
|
---|
| 2468 |
|
---|
| 2469 | /* resolve symbols */
|
---|
| 2470 | old_to_new_syms = tcc_mallocz(nb_syms * sizeof(int));
|
---|
| 2471 |
|
---|
| 2472 | sym = symtab + 1;
|
---|
| 2473 | for(i = 1; i < nb_syms; i++, sym++) {
|
---|
| 2474 | if (sym->st_shndx != SHN_UNDEF &&
|
---|
| 2475 | sym->st_shndx < SHN_LORESERVE) {
|
---|
| 2476 | sm = &sm_table[sym->st_shndx];
|
---|
| 2477 | if (sm->link_once) {
|
---|
| 2478 | /* if a symbol is in a link once section, we use the
|
---|
| 2479 | already defined symbol. It is very important to get
|
---|
| 2480 | correct relocations */
|
---|
| 2481 | if (ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) {
|
---|
[331] | 2482 | name = (char *) strtab + sym->st_name;
|
---|
[279] | 2483 | sym_index = find_elf_sym(symtab_section, name);
|
---|
| 2484 | if (sym_index)
|
---|
| 2485 | old_to_new_syms[i] = sym_index;
|
---|
| 2486 | }
|
---|
| 2487 | continue;
|
---|
| 2488 | }
|
---|
| 2489 | /* if no corresponding section added, no need to add symbol */
|
---|
| 2490 | if (!sm->s)
|
---|
| 2491 | continue;
|
---|
| 2492 | /* convert section number */
|
---|
| 2493 | sym->st_shndx = sm->s->sh_num;
|
---|
| 2494 | /* offset value */
|
---|
| 2495 | sym->st_value += sm->offset;
|
---|
| 2496 | }
|
---|
| 2497 | /* add symbol */
|
---|
[331] | 2498 | name = (char *) strtab + sym->st_name;
|
---|
| 2499 | sym_index = set_elf_sym(symtab_section, sym->st_value, sym->st_size,
|
---|
| 2500 | sym->st_info, sym->st_other,
|
---|
[279] | 2501 | sym->st_shndx, name);
|
---|
| 2502 | old_to_new_syms[i] = sym_index;
|
---|
| 2503 | }
|
---|
| 2504 |
|
---|
| 2505 | /* third pass to patch relocation entries */
|
---|
| 2506 | for(i = 1; i < ehdr.e_shnum; i++) {
|
---|
| 2507 | s = sm_table[i].s;
|
---|
| 2508 | if (!s)
|
---|
| 2509 | continue;
|
---|
| 2510 | sh = &shdr[i];
|
---|
| 2511 | offset = sm_table[i].offset;
|
---|
| 2512 | switch(s->sh_type) {
|
---|
| 2513 | case SHT_RELX:
|
---|
| 2514 | /* take relocation offset information */
|
---|
| 2515 | offseti = sm_table[sh->sh_info].offset;
|
---|
[331] | 2516 | for_each_elem(s, (offset / sizeof(*rel)), rel, ElfW_Rel) {
|
---|
[279] | 2517 | int type;
|
---|
| 2518 | unsigned sym_index;
|
---|
| 2519 | /* convert symbol index */
|
---|
| 2520 | type = ELFW(R_TYPE)(rel->r_info);
|
---|
| 2521 | sym_index = ELFW(R_SYM)(rel->r_info);
|
---|
| 2522 | /* NOTE: only one symtab assumed */
|
---|
| 2523 | if (sym_index >= nb_syms)
|
---|
| 2524 | goto invalid_reloc;
|
---|
| 2525 | sym_index = old_to_new_syms[sym_index];
|
---|
| 2526 | /* ignore link_once in rel section. */
|
---|
| 2527 | if (!sym_index && !sm->link_once
|
---|
| 2528 | #ifdef TCC_TARGET_ARM
|
---|
| 2529 | && type != R_ARM_V4BX
|
---|
| 2530 | #endif
|
---|
| 2531 | ) {
|
---|
| 2532 | invalid_reloc:
|
---|
| 2533 | tcc_error_noabort("Invalid relocation entry [%2d] '%s' @ %.8x",
|
---|
| 2534 | i, strsec + sh->sh_name, rel->r_offset);
|
---|
| 2535 | goto fail;
|
---|
| 2536 | }
|
---|
| 2537 | rel->r_info = ELFW(R_INFO)(sym_index, type);
|
---|
| 2538 | /* offset the relocation offset */
|
---|
| 2539 | rel->r_offset += offseti;
|
---|
| 2540 | #ifdef TCC_TARGET_ARM
|
---|
| 2541 | /* Jumps and branches from a Thumb code to a PLT entry need
|
---|
| 2542 | special handling since PLT entries are ARM code.
|
---|
| 2543 | Unconditional bl instructions referencing PLT entries are
|
---|
| 2544 | handled by converting these instructions into blx
|
---|
| 2545 | instructions. Other case of instructions referencing a PLT
|
---|
| 2546 | entry require to add a Thumb stub before the PLT entry to
|
---|
[331] | 2547 | switch to ARM mode. We set bit plt_thumb_stub of the
|
---|
| 2548 | attribute of a symbol to indicate such a case. */
|
---|
[279] | 2549 | if (type == R_ARM_THM_JUMP24)
|
---|
[331] | 2550 | get_sym_attr(s1, sym_index, 1)->plt_thumb_stub = 1;
|
---|
[279] | 2551 | #endif
|
---|
| 2552 | }
|
---|
| 2553 | break;
|
---|
| 2554 | default:
|
---|
| 2555 | break;
|
---|
| 2556 | }
|
---|
| 2557 | }
|
---|
[331] | 2558 |
|
---|
[279] | 2559 | ret = 0;
|
---|
| 2560 | the_end:
|
---|
| 2561 | tcc_free(symtab);
|
---|
| 2562 | tcc_free(strtab);
|
---|
| 2563 | tcc_free(old_to_new_syms);
|
---|
| 2564 | tcc_free(sm_table);
|
---|
| 2565 | tcc_free(strsec);
|
---|
| 2566 | tcc_free(shdr);
|
---|
| 2567 | return ret;
|
---|
| 2568 | }
|
---|
| 2569 |
|
---|
| 2570 | typedef struct ArchiveHeader {
|
---|
| 2571 | char ar_name[16]; /* name of this member */
|
---|
| 2572 | char ar_date[12]; /* file mtime */
|
---|
| 2573 | char ar_uid[6]; /* owner uid; printed as decimal */
|
---|
| 2574 | char ar_gid[6]; /* owner gid; printed as decimal */
|
---|
| 2575 | char ar_mode[8]; /* file mode, printed as octal */
|
---|
| 2576 | char ar_size[10]; /* file size, printed as decimal */
|
---|
| 2577 | char ar_fmag[2]; /* should contain ARFMAG */
|
---|
| 2578 | } ArchiveHeader;
|
---|
| 2579 |
|
---|
| 2580 | static int get_be32(const uint8_t *b)
|
---|
| 2581 | {
|
---|
| 2582 | return b[3] | (b[2] << 8) | (b[1] << 16) | (b[0] << 24);
|
---|
| 2583 | }
|
---|
| 2584 |
|
---|
[331] | 2585 | static long get_be64(const uint8_t *b)
|
---|
| 2586 | {
|
---|
| 2587 | long long ret = get_be32(b);
|
---|
| 2588 | ret = (ret << 32) | (unsigned)get_be32(b+4);
|
---|
| 2589 | return (long)ret;
|
---|
| 2590 | }
|
---|
| 2591 |
|
---|
[279] | 2592 | /* load only the objects which resolve undefined symbols */
|
---|
[331] | 2593 | static int tcc_load_alacarte(TCCState *s1, int fd, int size, int entrysize)
|
---|
[279] | 2594 | {
|
---|
[331] | 2595 | long i, bound, nsyms, sym_index, off, ret;
|
---|
[279] | 2596 | uint8_t *data;
|
---|
| 2597 | const char *ar_names, *p;
|
---|
| 2598 | const uint8_t *ar_index;
|
---|
| 2599 | ElfW(Sym) *sym;
|
---|
| 2600 |
|
---|
| 2601 | data = tcc_malloc(size);
|
---|
| 2602 | if (read(fd, data, size) != size)
|
---|
| 2603 | goto fail;
|
---|
[331] | 2604 | nsyms = entrysize == 4 ? get_be32(data) : get_be64(data);
|
---|
| 2605 | ar_index = data + entrysize;
|
---|
| 2606 | ar_names = (char *) ar_index + nsyms * entrysize;
|
---|
[279] | 2607 |
|
---|
| 2608 | do {
|
---|
| 2609 | bound = 0;
|
---|
| 2610 | for(p = ar_names, i = 0; i < nsyms; i++, p += strlen(p)+1) {
|
---|
| 2611 | sym_index = find_elf_sym(symtab_section, p);
|
---|
| 2612 | if(sym_index) {
|
---|
| 2613 | sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
|
---|
| 2614 | if(sym->st_shndx == SHN_UNDEF) {
|
---|
[331] | 2615 | off = (entrysize == 4
|
---|
| 2616 | ? get_be32(ar_index + i * 4)
|
---|
| 2617 | : get_be64(ar_index + i * 8))
|
---|
| 2618 | + sizeof(ArchiveHeader);
|
---|
[279] | 2619 | ++bound;
|
---|
| 2620 | if(tcc_load_object_file(s1, fd, off) < 0) {
|
---|
| 2621 | fail:
|
---|
| 2622 | ret = -1;
|
---|
| 2623 | goto the_end;
|
---|
| 2624 | }
|
---|
| 2625 | }
|
---|
| 2626 | }
|
---|
| 2627 | }
|
---|
| 2628 | } while(bound);
|
---|
| 2629 | ret = 0;
|
---|
| 2630 | the_end:
|
---|
| 2631 | tcc_free(data);
|
---|
| 2632 | return ret;
|
---|
| 2633 | }
|
---|
| 2634 |
|
---|
| 2635 | /* load a '.a' file */
|
---|
| 2636 | ST_FUNC int tcc_load_archive(TCCState *s1, int fd)
|
---|
| 2637 | {
|
---|
| 2638 | ArchiveHeader hdr;
|
---|
| 2639 | char ar_size[11];
|
---|
| 2640 | char ar_name[17];
|
---|
| 2641 | char magic[8];
|
---|
| 2642 | int size, len, i;
|
---|
| 2643 | unsigned long file_offset;
|
---|
| 2644 |
|
---|
| 2645 | /* skip magic which was already checked */
|
---|
| 2646 | read(fd, magic, sizeof(magic));
|
---|
[331] | 2647 |
|
---|
[279] | 2648 | for(;;) {
|
---|
| 2649 | len = read(fd, &hdr, sizeof(hdr));
|
---|
| 2650 | if (len == 0)
|
---|
| 2651 | break;
|
---|
| 2652 | if (len != sizeof(hdr)) {
|
---|
| 2653 | tcc_error_noabort("invalid archive");
|
---|
| 2654 | return -1;
|
---|
| 2655 | }
|
---|
| 2656 | memcpy(ar_size, hdr.ar_size, sizeof(hdr.ar_size));
|
---|
| 2657 | ar_size[sizeof(hdr.ar_size)] = '\0';
|
---|
| 2658 | size = strtol(ar_size, NULL, 0);
|
---|
| 2659 | memcpy(ar_name, hdr.ar_name, sizeof(hdr.ar_name));
|
---|
| 2660 | for(i = sizeof(hdr.ar_name) - 1; i >= 0; i--) {
|
---|
| 2661 | if (ar_name[i] != ' ')
|
---|
| 2662 | break;
|
---|
| 2663 | }
|
---|
| 2664 | ar_name[i + 1] = '\0';
|
---|
| 2665 | file_offset = lseek(fd, 0, SEEK_CUR);
|
---|
| 2666 | /* align to even */
|
---|
| 2667 | size = (size + 1) & ~1;
|
---|
| 2668 | if (!strcmp(ar_name, "/")) {
|
---|
| 2669 | /* coff symbol table : we handle it */
|
---|
| 2670 | if(s1->alacarte_link)
|
---|
[331] | 2671 | return tcc_load_alacarte(s1, fd, size, 4);
|
---|
| 2672 | } else if (!strcmp(ar_name, "/SYM64/")) {
|
---|
| 2673 | if(s1->alacarte_link)
|
---|
| 2674 | return tcc_load_alacarte(s1, fd, size, 8);
|
---|
[279] | 2675 | } else {
|
---|
[331] | 2676 | ElfW(Ehdr) ehdr;
|
---|
| 2677 | if (tcc_object_type(fd, &ehdr) == AFF_BINTYPE_REL) {
|
---|
| 2678 | if (tcc_load_object_file(s1, fd, file_offset) < 0)
|
---|
| 2679 | return -1;
|
---|
| 2680 | }
|
---|
[279] | 2681 | }
|
---|
| 2682 | lseek(fd, file_offset + size, SEEK_SET);
|
---|
| 2683 | }
|
---|
| 2684 | return 0;
|
---|
| 2685 | }
|
---|
| 2686 |
|
---|
| 2687 | #ifndef TCC_TARGET_PE
|
---|
| 2688 | /* load a DLL and all referenced DLLs. 'level = 0' means that the DLL
|
---|
| 2689 | is referenced by the user (so it should be added as DT_NEEDED in
|
---|
| 2690 | the generated ELF file) */
|
---|
| 2691 | ST_FUNC int tcc_load_dll(TCCState *s1, int fd, const char *filename, int level)
|
---|
[331] | 2692 | {
|
---|
[279] | 2693 | ElfW(Ehdr) ehdr;
|
---|
| 2694 | ElfW(Shdr) *shdr, *sh, *sh1;
|
---|
| 2695 | int i, j, nb_syms, nb_dts, sym_bind, ret;
|
---|
| 2696 | ElfW(Sym) *sym, *dynsym;
|
---|
| 2697 | ElfW(Dyn) *dt, *dynamic;
|
---|
| 2698 | unsigned char *dynstr;
|
---|
| 2699 | const char *name, *soname;
|
---|
| 2700 | DLLReference *dllref;
|
---|
[331] | 2701 |
|
---|
[279] | 2702 | read(fd, &ehdr, sizeof(ehdr));
|
---|
| 2703 |
|
---|
| 2704 | /* test CPU specific stuff */
|
---|
| 2705 | if (ehdr.e_ident[5] != ELFDATA2LSB ||
|
---|
| 2706 | ehdr.e_machine != EM_TCC_TARGET) {
|
---|
| 2707 | tcc_error_noabort("bad architecture");
|
---|
| 2708 | return -1;
|
---|
| 2709 | }
|
---|
| 2710 |
|
---|
| 2711 | /* read sections */
|
---|
| 2712 | shdr = load_data(fd, ehdr.e_shoff, sizeof(ElfW(Shdr)) * ehdr.e_shnum);
|
---|
| 2713 |
|
---|
| 2714 | /* load dynamic section and dynamic symbols */
|
---|
| 2715 | nb_syms = 0;
|
---|
| 2716 | nb_dts = 0;
|
---|
| 2717 | dynamic = NULL;
|
---|
| 2718 | dynsym = NULL; /* avoid warning */
|
---|
| 2719 | dynstr = NULL; /* avoid warning */
|
---|
| 2720 | for(i = 0, sh = shdr; i < ehdr.e_shnum; i++, sh++) {
|
---|
| 2721 | switch(sh->sh_type) {
|
---|
| 2722 | case SHT_DYNAMIC:
|
---|
| 2723 | nb_dts = sh->sh_size / sizeof(ElfW(Dyn));
|
---|
| 2724 | dynamic = load_data(fd, sh->sh_offset, sh->sh_size);
|
---|
| 2725 | break;
|
---|
| 2726 | case SHT_DYNSYM:
|
---|
| 2727 | nb_syms = sh->sh_size / sizeof(ElfW(Sym));
|
---|
| 2728 | dynsym = load_data(fd, sh->sh_offset, sh->sh_size);
|
---|
| 2729 | sh1 = &shdr[sh->sh_link];
|
---|
| 2730 | dynstr = load_data(fd, sh1->sh_offset, sh1->sh_size);
|
---|
| 2731 | break;
|
---|
| 2732 | default:
|
---|
| 2733 | break;
|
---|
| 2734 | }
|
---|
| 2735 | }
|
---|
[331] | 2736 |
|
---|
[279] | 2737 | /* compute the real library name */
|
---|
| 2738 | soname = tcc_basename(filename);
|
---|
[331] | 2739 |
|
---|
[279] | 2740 | for(i = 0, dt = dynamic; i < nb_dts; i++, dt++) {
|
---|
| 2741 | if (dt->d_tag == DT_SONAME) {
|
---|
[331] | 2742 | soname = (char *) dynstr + dt->d_un.d_val;
|
---|
[279] | 2743 | }
|
---|
| 2744 | }
|
---|
| 2745 |
|
---|
| 2746 | /* if the dll is already loaded, do not load it */
|
---|
| 2747 | for(i = 0; i < s1->nb_loaded_dlls; i++) {
|
---|
| 2748 | dllref = s1->loaded_dlls[i];
|
---|
| 2749 | if (!strcmp(soname, dllref->name)) {
|
---|
| 2750 | /* but update level if needed */
|
---|
| 2751 | if (level < dllref->level)
|
---|
| 2752 | dllref->level = level;
|
---|
| 2753 | ret = 0;
|
---|
| 2754 | goto the_end;
|
---|
| 2755 | }
|
---|
| 2756 | }
|
---|
| 2757 |
|
---|
| 2758 | /* add the dll and its level */
|
---|
| 2759 | dllref = tcc_mallocz(sizeof(DLLReference) + strlen(soname));
|
---|
| 2760 | dllref->level = level;
|
---|
| 2761 | strcpy(dllref->name, soname);
|
---|
[331] | 2762 | dynarray_add(&s1->loaded_dlls, &s1->nb_loaded_dlls, dllref);
|
---|
[279] | 2763 |
|
---|
| 2764 | /* add dynamic symbols in dynsym_section */
|
---|
| 2765 | for(i = 1, sym = dynsym + 1; i < nb_syms; i++, sym++) {
|
---|
| 2766 | sym_bind = ELFW(ST_BIND)(sym->st_info);
|
---|
| 2767 | if (sym_bind == STB_LOCAL)
|
---|
| 2768 | continue;
|
---|
[331] | 2769 | name = (char *) dynstr + sym->st_name;
|
---|
| 2770 | set_elf_sym(s1->dynsymtab_section, sym->st_value, sym->st_size,
|
---|
[279] | 2771 | sym->st_info, sym->st_other, sym->st_shndx, name);
|
---|
| 2772 | }
|
---|
| 2773 |
|
---|
| 2774 | /* load all referenced DLLs */
|
---|
| 2775 | for(i = 0, dt = dynamic; i < nb_dts; i++, dt++) {
|
---|
| 2776 | switch(dt->d_tag) {
|
---|
| 2777 | case DT_NEEDED:
|
---|
[331] | 2778 | name = (char *) dynstr + dt->d_un.d_val;
|
---|
[279] | 2779 | for(j = 0; j < s1->nb_loaded_dlls; j++) {
|
---|
| 2780 | dllref = s1->loaded_dlls[j];
|
---|
| 2781 | if (!strcmp(name, dllref->name))
|
---|
| 2782 | goto already_loaded;
|
---|
| 2783 | }
|
---|
| 2784 | if (tcc_add_dll(s1, name, AFF_REFERENCED_DLL) < 0) {
|
---|
| 2785 | tcc_error_noabort("referenced dll '%s' not found", name);
|
---|
| 2786 | ret = -1;
|
---|
| 2787 | goto the_end;
|
---|
| 2788 | }
|
---|
| 2789 | already_loaded:
|
---|
| 2790 | break;
|
---|
| 2791 | }
|
---|
| 2792 | }
|
---|
| 2793 | ret = 0;
|
---|
| 2794 | the_end:
|
---|
| 2795 | tcc_free(dynstr);
|
---|
| 2796 | tcc_free(dynsym);
|
---|
| 2797 | tcc_free(dynamic);
|
---|
| 2798 | tcc_free(shdr);
|
---|
| 2799 | return ret;
|
---|
| 2800 | }
|
---|
| 2801 |
|
---|
| 2802 | #define LD_TOK_NAME 256
|
---|
| 2803 | #define LD_TOK_EOF (-1)
|
---|
| 2804 |
|
---|
| 2805 | /* return next ld script token */
|
---|
| 2806 | static int ld_next(TCCState *s1, char *name, int name_size)
|
---|
| 2807 | {
|
---|
| 2808 | int c;
|
---|
| 2809 | char *q;
|
---|
| 2810 |
|
---|
| 2811 | redo:
|
---|
| 2812 | switch(ch) {
|
---|
| 2813 | case ' ':
|
---|
| 2814 | case '\t':
|
---|
| 2815 | case '\f':
|
---|
| 2816 | case '\v':
|
---|
| 2817 | case '\r':
|
---|
| 2818 | case '\n':
|
---|
| 2819 | inp();
|
---|
| 2820 | goto redo;
|
---|
| 2821 | case '/':
|
---|
| 2822 | minp();
|
---|
| 2823 | if (ch == '*') {
|
---|
| 2824 | file->buf_ptr = parse_comment(file->buf_ptr);
|
---|
| 2825 | ch = file->buf_ptr[0];
|
---|
| 2826 | goto redo;
|
---|
| 2827 | } else {
|
---|
| 2828 | q = name;
|
---|
| 2829 | *q++ = '/';
|
---|
| 2830 | goto parse_name;
|
---|
| 2831 | }
|
---|
| 2832 | break;
|
---|
[331] | 2833 | case '\\':
|
---|
| 2834 | ch = handle_eob();
|
---|
| 2835 | if (ch != '\\')
|
---|
| 2836 | goto redo;
|
---|
| 2837 | /* fall through */
|
---|
[279] | 2838 | /* case 'a' ... 'z': */
|
---|
| 2839 | case 'a':
|
---|
| 2840 | case 'b':
|
---|
| 2841 | case 'c':
|
---|
| 2842 | case 'd':
|
---|
| 2843 | case 'e':
|
---|
| 2844 | case 'f':
|
---|
| 2845 | case 'g':
|
---|
| 2846 | case 'h':
|
---|
| 2847 | case 'i':
|
---|
| 2848 | case 'j':
|
---|
| 2849 | case 'k':
|
---|
| 2850 | case 'l':
|
---|
| 2851 | case 'm':
|
---|
| 2852 | case 'n':
|
---|
| 2853 | case 'o':
|
---|
| 2854 | case 'p':
|
---|
| 2855 | case 'q':
|
---|
| 2856 | case 'r':
|
---|
| 2857 | case 's':
|
---|
| 2858 | case 't':
|
---|
| 2859 | case 'u':
|
---|
| 2860 | case 'v':
|
---|
| 2861 | case 'w':
|
---|
| 2862 | case 'x':
|
---|
| 2863 | case 'y':
|
---|
| 2864 | case 'z':
|
---|
| 2865 | /* case 'A' ... 'z': */
|
---|
| 2866 | case 'A':
|
---|
| 2867 | case 'B':
|
---|
| 2868 | case 'C':
|
---|
| 2869 | case 'D':
|
---|
| 2870 | case 'E':
|
---|
| 2871 | case 'F':
|
---|
| 2872 | case 'G':
|
---|
| 2873 | case 'H':
|
---|
| 2874 | case 'I':
|
---|
| 2875 | case 'J':
|
---|
| 2876 | case 'K':
|
---|
| 2877 | case 'L':
|
---|
| 2878 | case 'M':
|
---|
| 2879 | case 'N':
|
---|
| 2880 | case 'O':
|
---|
| 2881 | case 'P':
|
---|
| 2882 | case 'Q':
|
---|
| 2883 | case 'R':
|
---|
| 2884 | case 'S':
|
---|
| 2885 | case 'T':
|
---|
| 2886 | case 'U':
|
---|
| 2887 | case 'V':
|
---|
| 2888 | case 'W':
|
---|
| 2889 | case 'X':
|
---|
| 2890 | case 'Y':
|
---|
| 2891 | case 'Z':
|
---|
| 2892 | case '_':
|
---|
| 2893 | case '.':
|
---|
| 2894 | case '$':
|
---|
| 2895 | case '~':
|
---|
| 2896 | q = name;
|
---|
| 2897 | parse_name:
|
---|
| 2898 | for(;;) {
|
---|
| 2899 | if (!((ch >= 'a' && ch <= 'z') ||
|
---|
| 2900 | (ch >= 'A' && ch <= 'Z') ||
|
---|
| 2901 | (ch >= '0' && ch <= '9') ||
|
---|
| 2902 | strchr("/.-_+=$:\\,~", ch)))
|
---|
| 2903 | break;
|
---|
| 2904 | if ((q - name) < name_size - 1) {
|
---|
| 2905 | *q++ = ch;
|
---|
| 2906 | }
|
---|
| 2907 | minp();
|
---|
| 2908 | }
|
---|
| 2909 | *q = '\0';
|
---|
| 2910 | c = LD_TOK_NAME;
|
---|
| 2911 | break;
|
---|
| 2912 | case CH_EOF:
|
---|
| 2913 | c = LD_TOK_EOF;
|
---|
| 2914 | break;
|
---|
| 2915 | default:
|
---|
| 2916 | c = ch;
|
---|
| 2917 | inp();
|
---|
| 2918 | break;
|
---|
| 2919 | }
|
---|
| 2920 | return c;
|
---|
| 2921 | }
|
---|
| 2922 |
|
---|
| 2923 | static int ld_add_file(TCCState *s1, const char filename[])
|
---|
| 2924 | {
|
---|
[331] | 2925 | if (filename[0] == '/') {
|
---|
| 2926 | if (CONFIG_SYSROOT[0] == '\0'
|
---|
| 2927 | && tcc_add_file_internal(s1, filename, AFF_TYPE_BIN) == 0)
|
---|
| 2928 | return 0;
|
---|
| 2929 | filename = tcc_basename(filename);
|
---|
| 2930 | }
|
---|
| 2931 | return tcc_add_dll(s1, filename, 0);
|
---|
[279] | 2932 | }
|
---|
| 2933 |
|
---|
| 2934 | static inline int new_undef_syms(void)
|
---|
| 2935 | {
|
---|
| 2936 | int ret = 0;
|
---|
| 2937 | ret = new_undef_sym;
|
---|
| 2938 | new_undef_sym = 0;
|
---|
| 2939 | return ret;
|
---|
| 2940 | }
|
---|
| 2941 |
|
---|
| 2942 | static int ld_add_file_list(TCCState *s1, const char *cmd, int as_needed)
|
---|
| 2943 | {
|
---|
| 2944 | char filename[1024], libname[1024];
|
---|
| 2945 | int t, group, nblibs = 0, ret = 0;
|
---|
| 2946 | char **libs = NULL;
|
---|
| 2947 |
|
---|
| 2948 | group = !strcmp(cmd, "GROUP");
|
---|
| 2949 | if (!as_needed)
|
---|
| 2950 | new_undef_syms();
|
---|
| 2951 | t = ld_next(s1, filename, sizeof(filename));
|
---|
| 2952 | if (t != '(')
|
---|
| 2953 | expect("(");
|
---|
| 2954 | t = ld_next(s1, filename, sizeof(filename));
|
---|
| 2955 | for(;;) {
|
---|
| 2956 | libname[0] = '\0';
|
---|
| 2957 | if (t == LD_TOK_EOF) {
|
---|
| 2958 | tcc_error_noabort("unexpected end of file");
|
---|
| 2959 | ret = -1;
|
---|
| 2960 | goto lib_parse_error;
|
---|
| 2961 | } else if (t == ')') {
|
---|
| 2962 | break;
|
---|
| 2963 | } else if (t == '-') {
|
---|
| 2964 | t = ld_next(s1, filename, sizeof(filename));
|
---|
| 2965 | if ((t != LD_TOK_NAME) || (filename[0] != 'l')) {
|
---|
| 2966 | tcc_error_noabort("library name expected");
|
---|
| 2967 | ret = -1;
|
---|
| 2968 | goto lib_parse_error;
|
---|
| 2969 | }
|
---|
| 2970 | pstrcpy(libname, sizeof libname, &filename[1]);
|
---|
| 2971 | if (s1->static_link) {
|
---|
| 2972 | snprintf(filename, sizeof filename, "lib%s.a", libname);
|
---|
| 2973 | } else {
|
---|
| 2974 | snprintf(filename, sizeof filename, "lib%s.so", libname);
|
---|
| 2975 | }
|
---|
| 2976 | } else if (t != LD_TOK_NAME) {
|
---|
| 2977 | tcc_error_noabort("filename expected");
|
---|
| 2978 | ret = -1;
|
---|
| 2979 | goto lib_parse_error;
|
---|
| 2980 | }
|
---|
| 2981 | if (!strcmp(filename, "AS_NEEDED")) {
|
---|
| 2982 | ret = ld_add_file_list(s1, cmd, 1);
|
---|
| 2983 | if (ret)
|
---|
| 2984 | goto lib_parse_error;
|
---|
| 2985 | } else {
|
---|
| 2986 | /* TODO: Implement AS_NEEDED support. Ignore it for now */
|
---|
| 2987 | if (!as_needed) {
|
---|
| 2988 | ret = ld_add_file(s1, filename);
|
---|
| 2989 | if (ret)
|
---|
| 2990 | goto lib_parse_error;
|
---|
| 2991 | if (group) {
|
---|
| 2992 | /* Add the filename *and* the libname to avoid future conversions */
|
---|
[331] | 2993 | dynarray_add(&libs, &nblibs, tcc_strdup(filename));
|
---|
[279] | 2994 | if (libname[0] != '\0')
|
---|
[331] | 2995 | dynarray_add(&libs, &nblibs, tcc_strdup(libname));
|
---|
[279] | 2996 | }
|
---|
| 2997 | }
|
---|
| 2998 | }
|
---|
| 2999 | t = ld_next(s1, filename, sizeof(filename));
|
---|
| 3000 | if (t == ',') {
|
---|
| 3001 | t = ld_next(s1, filename, sizeof(filename));
|
---|
| 3002 | }
|
---|
| 3003 | }
|
---|
| 3004 | if (group && !as_needed) {
|
---|
| 3005 | while (new_undef_syms()) {
|
---|
| 3006 | int i;
|
---|
| 3007 |
|
---|
| 3008 | for (i = 0; i < nblibs; i ++)
|
---|
| 3009 | ld_add_file(s1, libs[i]);
|
---|
| 3010 | }
|
---|
| 3011 | }
|
---|
| 3012 | lib_parse_error:
|
---|
| 3013 | dynarray_reset(&libs, &nblibs);
|
---|
| 3014 | return ret;
|
---|
| 3015 | }
|
---|
| 3016 |
|
---|
| 3017 | /* interpret a subset of GNU ldscripts to handle the dummy libc.so
|
---|
| 3018 | files */
|
---|
| 3019 | ST_FUNC int tcc_load_ldscript(TCCState *s1)
|
---|
| 3020 | {
|
---|
| 3021 | char cmd[64];
|
---|
| 3022 | char filename[1024];
|
---|
| 3023 | int t, ret;
|
---|
[331] | 3024 |
|
---|
[279] | 3025 | ch = handle_eob();
|
---|
| 3026 | for(;;) {
|
---|
| 3027 | t = ld_next(s1, cmd, sizeof(cmd));
|
---|
| 3028 | if (t == LD_TOK_EOF)
|
---|
| 3029 | return 0;
|
---|
| 3030 | else if (t != LD_TOK_NAME)
|
---|
| 3031 | return -1;
|
---|
| 3032 | if (!strcmp(cmd, "INPUT") ||
|
---|
| 3033 | !strcmp(cmd, "GROUP")) {
|
---|
| 3034 | ret = ld_add_file_list(s1, cmd, 0);
|
---|
| 3035 | if (ret)
|
---|
| 3036 | return ret;
|
---|
| 3037 | } else if (!strcmp(cmd, "OUTPUT_FORMAT") ||
|
---|
| 3038 | !strcmp(cmd, "TARGET")) {
|
---|
| 3039 | /* ignore some commands */
|
---|
| 3040 | t = ld_next(s1, cmd, sizeof(cmd));
|
---|
| 3041 | if (t != '(')
|
---|
| 3042 | expect("(");
|
---|
| 3043 | for(;;) {
|
---|
| 3044 | t = ld_next(s1, filename, sizeof(filename));
|
---|
| 3045 | if (t == LD_TOK_EOF) {
|
---|
| 3046 | tcc_error_noabort("unexpected end of file");
|
---|
| 3047 | return -1;
|
---|
| 3048 | } else if (t == ')') {
|
---|
| 3049 | break;
|
---|
| 3050 | }
|
---|
| 3051 | }
|
---|
| 3052 | } else {
|
---|
| 3053 | return -1;
|
---|
| 3054 | }
|
---|
| 3055 | }
|
---|
| 3056 | return 0;
|
---|
| 3057 | }
|
---|
[331] | 3058 | #endif /* !TCC_TARGET_PE */
|
---|