Revert "fix-mixed-struct (patch by Pip Cet)"
[tinycc.git] / tccelf.c
Commit [+]AuthorDateLineData
3a58c53e bellard2002-08-18 13:17:59 +00001/*
2 * ELF file handling for TCC
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08003 *
c9c05ca5 bellard2004-10-27 21:38:03 +00004 * Copyright (c) 2001-2004 Fabrice Bellard
3a58c53e bellard2002-08-18 13:17:59 +00005 *
8f5e44a4 bellard2003-05-24 14:11:17 +00006 * 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.
3a58c53e bellard2002-08-18 13:17:59 +000010 *
8f5e44a4 bellard2003-05-24 14:11:17 +000011 * 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.
3a58c53e bellard2002-08-18 13:17:59 +000015 *
8f5e44a4 bellard2003-05-24 14:11:17 +000016 * 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
3a58c53e bellard2002-08-18 13:17:59 +000019 */
20
88a3ccab grischka2009-12-20 01:53:49 +010021#include "tcc.h"
22
01c04192
MM
Michael Matz2014-04-06 01:02:42 +020023/* Define this to get some debug output during relocation processing. */
24#undef DEBUG_RELOC
25
4aec2902 Thomas Preud'homme2013-12-18 11:17:17 +080026/* XXX: avoid static variable */
3ad31681
TP
Thomas Preud'homme2010-04-20 15:49:34 +020027static int new_undef_sym = 0; /* Is there a new undefined sym since last new_undef_sym() */
28
88a3ccab grischka2009-12-20 01:53:49 +010029ST_FUNC int put_elf_str(Section *s, const char *sym)
3a58c53e bellard2002-08-18 13:17:59 +000030{
31 int offset, len;
32 char *ptr;
33
34 len = strlen(sym) + 1;
35 offset = s->data_offset;
36 ptr = section_ptr_add(s, len);
37 memcpy(ptr, sym, len);
38 return offset;
39}
40
41/* elf symbol hashing function */
42static unsigned long elf_hash(const unsigned char *name)
43{
44 unsigned long h = 0, g;
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +080045
3a58c53e bellard2002-08-18 13:17:59 +000046 while (*name) {
47 h = (h << 4) + *name++;
48 g = h & 0xf0000000;
49 if (g)
50 h ^= g >> 24;
51 h &= ~g;
52 }
53 return h;
54}
55
56/* rebuild hash table of section s */
57/* NOTE: we do factorize the hash table code to go faster */
58static void rebuild_hash(Section *s, unsigned int nb_buckets)
59{
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +090060 ElfW(Sym) *sym;
3a58c53e bellard2002-08-18 13:17:59 +000061 int *ptr, *hash, nb_syms, sym_index, h;
62d1da1b Thomas Preud'homme2014-03-09 22:52:31 +080062 unsigned char *strtab;
3a58c53e bellard2002-08-18 13:17:59 +000063
64 strtab = s->link->data;
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +090065 nb_syms = s->data_offset / sizeof(ElfW(Sym));
3a58c53e bellard2002-08-18 13:17:59 +000066
67 s->hash->data_offset = 0;
68 ptr = section_ptr_add(s->hash, (2 + nb_buckets + nb_syms) * sizeof(int));
69 ptr[0] = nb_buckets;
70 ptr[1] = nb_syms;
71 ptr += 2;
72 hash = ptr;
73 memset(hash, 0, (nb_buckets + 1) * sizeof(int));
74 ptr += nb_buckets + 1;
75
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +090076 sym = (ElfW(Sym) *)s->data + 1;
3a58c53e bellard2002-08-18 13:17:59 +000077 for(sym_index = 1; sym_index < nb_syms; sym_index++) {
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +090078 if (ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) {
3a58c53e bellard2002-08-18 13:17:59 +000079 h = elf_hash(strtab + sym->st_name) % nb_buckets;
80 *ptr = hash[h];
81 hash[h] = sym_index;
82 } else {
83 *ptr = 0;
84 }
85 ptr++;
86 sym++;
87 }
88}
89
90/* return the symbol number */
82bcbd02 grischka2013-02-04 16:08:06 +010091ST_FUNC int put_elf_sym(Section *s, addr_t value, unsigned long size,
52991422 grischka2010-01-14 20:56:04 +010092 int info, int other, int shndx, const char *name)
3a58c53e bellard2002-08-18 13:17:59 +000093{
94 int name_offset, sym_index;
95 int nbuckets, h;
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +090096 ElfW(Sym) *sym;
3a58c53e bellard2002-08-18 13:17:59 +000097 Section *hs;
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +080098
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +090099 sym = section_ptr_add(s, sizeof(ElfW(Sym)));
3a58c53e bellard2002-08-18 13:17:59 +0000100 if (name)
101 name_offset = put_elf_str(s->link, name);
102 else
103 name_offset = 0;
104 /* XXX: endianness */
105 sym->st_name = name_offset;
106 sym->st_value = value;
107 sym->st_size = size;
108 sym->st_info = info;
109 sym->st_other = other;
110 sym->st_shndx = shndx;
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900111 sym_index = sym - (ElfW(Sym) *)s->data;
3a58c53e bellard2002-08-18 13:17:59 +0000112 hs = s->hash;
113 if (hs) {
114 int *ptr, *base;
115 ptr = section_ptr_add(hs, sizeof(int));
116 base = (int *)hs->data;
117 /* only add global or weak symbols */
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900118 if (ELFW(ST_BIND)(info) != STB_LOCAL) {
3a58c53e bellard2002-08-18 13:17:59 +0000119 /* add another hashing entry */
120 nbuckets = base[0];
62d1da1b Thomas Preud'homme2014-03-09 22:52:31 +0800121 h = elf_hash((unsigned char *) name) % nbuckets;
3a58c53e bellard2002-08-18 13:17:59 +0000122 *ptr = base[2 + h];
123 base[2 + h] = sym_index;
124 base[1]++;
125 /* we resize the hash table */
126 hs->nb_hashed_syms++;
127 if (hs->nb_hashed_syms > 2 * nbuckets) {
128 rebuild_hash(s, 2 * nbuckets);
129 }
130 } else {
131 *ptr = 0;
132 base[1]++;
133 }
134 }
135 return sym_index;
136}
137
138/* find global ELF symbol 'name' and return its index. Return 0 if not
139 found. */
88a3ccab grischka2009-12-20 01:53:49 +0100140ST_FUNC int find_elf_sym(Section *s, const char *name)
3a58c53e bellard2002-08-18 13:17:59 +0000141{
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900142 ElfW(Sym) *sym;
3a58c53e bellard2002-08-18 13:17:59 +0000143 Section *hs;
144 int nbuckets, sym_index, h;
145 const char *name1;
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +0800146
3a58c53e bellard2002-08-18 13:17:59 +0000147 hs = s->hash;
148 if (!hs)
149 return 0;
150 nbuckets = ((int *)hs->data)[0];
62d1da1b Thomas Preud'homme2014-03-09 22:52:31 +0800151 h = elf_hash((unsigned char *) name) % nbuckets;
3a58c53e bellard2002-08-18 13:17:59 +0000152 sym_index = ((int *)hs->data)[2 + h];
153 while (sym_index != 0) {
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900154 sym = &((ElfW(Sym) *)s->data)[sym_index];
62d1da1b Thomas Preud'homme2014-03-09 22:52:31 +0800155 name1 = (char *) s->link->data + sym->st_name;
3a58c53e bellard2002-08-18 13:17:59 +0000156 if (!strcmp(name, name1))
157 return sym_index;
158 sym_index = ((int *)hs->data)[2 + nbuckets + sym_index];
159 }
160 return 0;
161}
162
1026ca58 grischka2009-07-10 16:29:10 +0100163/* return elf symbol value, signal error if 'err' is nonzero */
82bcbd02 grischka2013-02-04 16:08:06 +0100164ST_FUNC addr_t get_elf_sym_addr(TCCState *s, const char *name, int err)
3a58c53e bellard2002-08-18 13:17:59 +0000165{
166 int sym_index;
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900167 ElfW(Sym) *sym;
1026ca58 grischka2009-07-10 16:29:10 +0100168
f98c2306 grischka2012-04-18 18:48:26 +0200169 sym_index = find_elf_sym(s->symtab, name);
170 sym = &((ElfW(Sym) *)s->symtab->data)[sym_index];
1026ca58 grischka2009-07-10 16:29:10 +0100171 if (!sym_index || sym->st_shndx == SHN_UNDEF) {
172 if (err)
bf374a5f grischka2011-08-11 17:07:56 +0200173 tcc_error("%s not defined", name);
82bcbd02 grischka2013-02-04 16:08:06 +0100174 return 0;
1026ca58 grischka2009-07-10 16:29:10 +0100175 }
82bcbd02 grischka2013-02-04 16:08:06 +0100176 return sym->st_value;
f8d02417 bellard2003-07-20 19:19:58 +0000177}
178
1026ca58 grischka2009-07-10 16:29:10 +0100179/* return elf symbol value */
88a3ccab grischka2009-12-20 01:53:49 +0100180LIBTCCAPI void *tcc_get_symbol(TCCState *s, const char *name)
1026ca58 grischka2009-07-10 16:29:10 +0100181{
e0aee4f4 grischka2013-02-04 20:57:57 +0100182 return (void*)(uintptr_t)get_elf_sym_addr(s, name, 0);
1026ca58 grischka2009-07-10 16:29:10 +0100183}
184
4ad186c5 grischka2014-01-06 19:07:08 +0100185#if defined TCC_IS_NATIVE || defined TCC_TARGET_PE
1026ca58 grischka2009-07-10 16:29:10 +0100186/* return elf symbol value or error */
82bcbd02 grischka2013-02-04 16:08:06 +0100187ST_FUNC void* tcc_get_symbol_err(TCCState *s, const char *name)
f8d02417 bellard2003-07-20 19:19:58 +0000188{
4ad186c5 grischka2014-01-06 19:07:08 +0100189 return (void*)(uintptr_t)get_elf_sym_addr(s, name, 1);
3a58c53e bellard2002-08-18 13:17:59 +0000190}
82bcbd02 grischka2013-02-04 16:08:06 +0100191#endif
3a58c53e bellard2002-08-18 13:17:59 +0000192
193/* add an elf symbol : check if it is already defined and patch
194 it. Return symbol index. NOTE that sh_num can be SHN_UNDEF. */
82bcbd02 grischka2013-02-04 16:08:06 +0100195ST_FUNC int add_elf_sym(Section *s, addr_t value, unsigned long size,
d733dc75 bellard2005-04-13 21:37:06 +0000196 int info, int other, int sh_num, const char *name)
3a58c53e bellard2002-08-18 13:17:59 +0000197{
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900198 ElfW(Sym) *esym;
3a58c53e bellard2002-08-18 13:17:59 +0000199 int sym_bind, sym_index, sym_type, esym_bind;
d778bde7 grischka2007-11-21 17:16:31 +0000200 unsigned char sym_vis, esym_vis, new_vis;
3a58c53e bellard2002-08-18 13:17:59 +0000201
7dd792ef
SH
Shinichiro Hamaji2008-11-30 08:14:07 +0900202 sym_bind = ELFW(ST_BIND)(info);
203 sym_type = ELFW(ST_TYPE)(info);
204 sym_vis = ELFW(ST_VISIBILITY)(other);
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +0800205
3a58c53e bellard2002-08-18 13:17:59 +0000206 if (sym_bind != STB_LOCAL) {
207 /* we search global or weak symbols */
208 sym_index = find_elf_sym(s, name);
209 if (!sym_index)
210 goto do_def;
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900211 esym = &((ElfW(Sym) *)s->data)[sym_index];
3a58c53e bellard2002-08-18 13:17:59 +0000212 if (esym->st_shndx != SHN_UNDEF) {
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900213 esym_bind = ELFW(ST_BIND)(esym->st_info);
d778bde7 grischka2007-11-21 17:16:31 +0000214 /* propagate the most constraining visibility */
215 /* STV_DEFAULT(0)<STV_PROTECTED(3)<STV_HIDDEN(2)<STV_INTERNAL(1) */
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900216 esym_vis = ELFW(ST_VISIBILITY)(esym->st_other);
d778bde7 grischka2007-11-21 17:16:31 +0000217 if (esym_vis == STV_DEFAULT) {
218 new_vis = sym_vis;
219 } else if (sym_vis == STV_DEFAULT) {
220 new_vis = esym_vis;
221 } else {
222 new_vis = (esym_vis < sym_vis) ? esym_vis : sym_vis;
223 }
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900224 esym->st_other = (esym->st_other & ~ELFW(ST_VISIBILITY)(-1))
d778bde7 grischka2007-11-21 17:16:31 +0000225 | new_vis;
226 other = esym->st_other; /* in case we have to patch esym */
3a58c53e bellard2002-08-18 13:17:59 +0000227 if (sh_num == SHN_UNDEF) {
228 /* ignore adding of undefined symbol if the
229 corresponding symbol is already defined */
230 } else if (sym_bind == STB_GLOBAL && esym_bind == STB_WEAK) {
231 /* global overrides weak, so patch */
232 goto do_patch;
233 } else if (sym_bind == STB_WEAK && esym_bind == STB_GLOBAL) {
234 /* weak is ignored if already global */
585027aa
JS
Joe Soroka2011-03-07 12:18:54 -0800235 } else if (sym_bind == STB_WEAK && esym_bind == STB_WEAK) {
236 /* keep first-found weak definition, ignore subsequents */
d778bde7 grischka2007-11-21 17:16:31 +0000237 } else if (sym_vis == STV_HIDDEN || sym_vis == STV_INTERNAL) {
238 /* ignore hidden symbols after */
bba515af grischka2009-06-17 02:08:54 +0200239 } else if (esym->st_shndx == SHN_COMMON
240 && (sh_num < SHN_LORESERVE || sh_num == SHN_COMMON)) {
e2c89576 grischka2008-03-08 19:58:57 +0000241 /* gr: Happens with 'tcc ... -static tcctest.c' on e.g. Ubuntu 6.01
242 No idea if this is the correct solution ... */
243 goto do_patch;
244 } else if (s == tcc_state->dynsymtab_section) {
245 /* we accept that two DLL define the same symbol */
3a58c53e bellard2002-08-18 13:17:59 +0000246 } else {
05108a3b grischka2013-02-12 19:13:28 +0100247#if 0
e2c89576 grischka2008-03-08 19:58:57 +0000248 printf("new_bind=%x new_shndx=%x new_vis=%x old_bind=%x old_shndx=%x old_vis=%x\n",
249 sym_bind, sh_num, new_vis, esym_bind, esym->st_shndx, esym_vis);
3a58c53e bellard2002-08-18 13:17:59 +0000250#endif
bf374a5f grischka2011-08-11 17:07:56 +0200251 tcc_error_noabort("'%s' defined twice", name);
3a58c53e bellard2002-08-18 13:17:59 +0000252 }
253 } else {
254 do_patch:
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900255 esym->st_info = ELFW(ST_INFO)(sym_bind, sym_type);
3a58c53e bellard2002-08-18 13:17:59 +0000256 esym->st_shndx = sh_num;
47abdbd3 Thomas Preud'homme2010-03-30 09:45:31 +0200257 new_undef_sym = 1;
3a58c53e bellard2002-08-18 13:17:59 +0000258 esym->st_value = value;
259 esym->st_size = size;
d733dc75 bellard2005-04-13 21:37:06 +0000260 esym->st_other = other;
3a58c53e bellard2002-08-18 13:17:59 +0000261 }
262 } else {
263 do_def:
3d4b57ff
TP
Thomas Preud'homme2013-12-17 20:59:14 +0800264 sym_index = put_elf_sym(s, value, size,
265 ELFW(ST_INFO)(sym_bind, sym_type), other,
3a58c53e bellard2002-08-18 13:17:59 +0000266 sh_num, name);
267 }
268 return sym_index;
269}
270
271/* put relocation */
738606db Edmund Grimley Evans2015-02-21 21:29:03 +0000272ST_FUNC void put_elf_reloca(Section *symtab, Section *s, unsigned long offset,
8f639006 seyko2015-03-23 19:24:55 +0300273 int type, int symbol, addr_t addend)
3a58c53e bellard2002-08-18 13:17:59 +0000274{
275 char buf[256];
276 Section *sr;
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900277 ElfW_Rel *rel;
3a58c53e bellard2002-08-18 13:17:59 +0000278
279 sr = s->reloc;
280 if (!sr) {
281 /* if no relocation section, create it */
27d23342 Shinichiro Hamaji2008-12-01 02:52:08 +0900282 snprintf(buf, sizeof(buf), REL_SECTION_FMT, s->name);
3a58c53e bellard2002-08-18 13:17:59 +0000283 /* if the symtab is allocated, then we consider the relocation
284 are also */
7dd792ef
SH
Shinichiro Hamaji2008-11-30 08:14:07 +0900285 sr = new_section(tcc_state, buf, SHT_RELX, symtab->sh_flags);
286 sr->sh_entsize = sizeof(ElfW_Rel);
3a58c53e bellard2002-08-18 13:17:59 +0000287 sr->link = symtab;
288 sr->sh_info = s->sh_num;
289 s->reloc = sr;
290 }
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900291 rel = section_ptr_add(sr, sizeof(ElfW_Rel));
3a58c53e bellard2002-08-18 13:17:59 +0000292 rel->r_offset = offset;
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900293 rel->r_info = ELFW(R_INFO)(symbol, type);
b14ef0e2 Edmund Grimley Evans2015-02-13 18:58:31 +0000294#if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
738606db
EGE
Edmund Grimley Evans2015-02-21 21:29:03 +0000295 rel->r_addend = addend;
296#else
297 if (addend)
298 tcc_error("non-zero addend on REL architecture");
0a9873aa Shinichiro Hamaji2008-12-02 03:19:25 +0900299#endif
3a58c53e bellard2002-08-18 13:17:59 +0000300}
301
738606db
EGE
Edmund Grimley Evans2015-02-21 21:29:03 +0000302ST_FUNC void put_elf_reloc(Section *symtab, Section *s, unsigned long offset,
303 int type, int symbol)
304{
305 put_elf_reloca(symtab, s, offset, type, symbol, 0);
306}
307
3a58c53e bellard2002-08-18 13:17:59 +0000308/* put stab debug information */
309
88a3ccab grischka2009-12-20 01:53:49 +0100310ST_FUNC void put_stabs(const char *str, int type, int other, int desc,
3a58c53e bellard2002-08-18 13:17:59 +0000311 unsigned long value)
312{
313 Stab_Sym *sym;
314
315 sym = section_ptr_add(stab_section, sizeof(Stab_Sym));
316 if (str) {
317 sym->n_strx = put_elf_str(stabstr_section, str);
318 } else {
319 sym->n_strx = 0;
320 }
321 sym->n_type = type;
322 sym->n_other = other;
323 sym->n_desc = desc;
324 sym->n_value = value;
325}
326
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +0800327ST_FUNC void put_stabs_r(const char *str, int type, int other, int desc,
3a58c53e bellard2002-08-18 13:17:59 +0000328 unsigned long value, Section *sec, int sym_index)
329{
330 put_stabs(str, type, other, desc, value);
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +0800331 put_elf_reloc(symtab_section, stab_section,
754b0beb Shinichiro Hamaji2009-04-04 03:09:35 +0900332 stab_section->data_offset - sizeof(unsigned int),
3a58c53e bellard2002-08-18 13:17:59 +0000333 R_DATA_32, sym_index);
334}
335
88a3ccab grischka2009-12-20 01:53:49 +0100336ST_FUNC void put_stabn(int type, int other, int desc, int value)
3a58c53e bellard2002-08-18 13:17:59 +0000337{
338 put_stabs(NULL, type, other, desc, value);
339}
340
88a3ccab grischka2009-12-20 01:53:49 +0100341ST_FUNC void put_stabd(int type, int other, int desc)
3a58c53e bellard2002-08-18 13:17:59 +0000342{
343 put_stabs(NULL, type, other, desc, 0);
344}
345
55f751ac
TP
Thomas Preud'homme2013-12-17 21:02:51 +0800346/* Browse each elem of type <type> in section <sec> starting at elem <startoff>
347 using variable <elem> */
348#define for_each_elem(sec, startoff, elem, type) \
349 for (elem = (type *) sec->data + startoff; \
350 elem < (type *) (sec->data + sec->data_offset); elem++)
351
3a58c53e bellard2002-08-18 13:17:59 +0000352/* In an ELF file symbol table, the local symbols must appear below
353 the global and weak ones. Since TCC cannot sort it while generating
354 the code, we must do it after. All the relocation tables are also
355 modified to take into account the symbol table sorting */
e4c7dd5e bellard2002-11-02 14:13:21 +0000356static void sort_syms(TCCState *s1, Section *s)
3a58c53e bellard2002-08-18 13:17:59 +0000357{
358 int *old_to_new_syms;
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900359 ElfW(Sym) *new_syms;
3a58c53e bellard2002-08-18 13:17:59 +0000360 int nb_syms, i;
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900361 ElfW(Sym) *p, *q;
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +0800362 ElfW_Rel *rel;
3a58c53e bellard2002-08-18 13:17:59 +0000363 Section *sr;
364 int type, sym_index;
365
7dd792ef
SH
Shinichiro Hamaji2008-11-30 08:14:07 +0900366 nb_syms = s->data_offset / sizeof(ElfW(Sym));
367 new_syms = tcc_malloc(nb_syms * sizeof(ElfW(Sym)));
3a58c53e bellard2002-08-18 13:17:59 +0000368 old_to_new_syms = tcc_malloc(nb_syms * sizeof(int));
369
370 /* first pass for local symbols */
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900371 p = (ElfW(Sym) *)s->data;
3a58c53e bellard2002-08-18 13:17:59 +0000372 q = new_syms;
373 for(i = 0; i < nb_syms; i++) {
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900374 if (ELFW(ST_BIND)(p->st_info) == STB_LOCAL) {
3a58c53e bellard2002-08-18 13:17:59 +0000375 old_to_new_syms[i] = q - new_syms;
376 *q++ = *p;
377 }
378 p++;
379 }
380 /* save the number of local symbols in section header */
381 s->sh_info = q - new_syms;
382
383 /* then second pass for non local symbols */
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900384 p = (ElfW(Sym) *)s->data;
3a58c53e bellard2002-08-18 13:17:59 +0000385 for(i = 0; i < nb_syms; i++) {
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900386 if (ELFW(ST_BIND)(p->st_info) != STB_LOCAL) {
3a58c53e bellard2002-08-18 13:17:59 +0000387 old_to_new_syms[i] = q - new_syms;
388 *q++ = *p;
389 }
390 p++;
391 }
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +0800392
3a58c53e bellard2002-08-18 13:17:59 +0000393 /* we copy the new symbols to the old */
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900394 memcpy(s->data, new_syms, nb_syms * sizeof(ElfW(Sym)));
3a58c53e bellard2002-08-18 13:17:59 +0000395 tcc_free(new_syms);
396
397 /* now we modify all the relocations */
e4c7dd5e bellard2002-11-02 14:13:21 +0000398 for(i = 1; i < s1->nb_sections; i++) {
399 sr = s1->sections[i];
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900400 if (sr->sh_type == SHT_RELX && sr->link == s) {
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +0800401 for_each_elem(sr, 0, rel, ElfW_Rel) {
7dd792ef
SH
Shinichiro Hamaji2008-11-30 08:14:07 +0900402 sym_index = ELFW(R_SYM)(rel->r_info);
403 type = ELFW(R_TYPE)(rel->r_info);
3a58c53e bellard2002-08-18 13:17:59 +0000404 sym_index = old_to_new_syms[sym_index];
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900405 rel->r_info = ELFW(R_INFO)(sym_index, type);
3a58c53e bellard2002-08-18 13:17:59 +0000406 }
407 }
408 }
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +0800409
3a58c53e bellard2002-08-18 13:17:59 +0000410 tcc_free(old_to_new_syms);
411}
412
413/* relocate common symbols in the .bss section */
88a3ccab grischka2009-12-20 01:53:49 +0100414ST_FUNC void relocate_common_syms(void)
3a58c53e bellard2002-08-18 13:17:59 +0000415{
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +0800416 ElfW(Sym) *sym;
3a58c53e bellard2002-08-18 13:17:59 +0000417 unsigned long offset, align;
55f751ac
TP
Thomas Preud'homme2013-12-17 21:02:51 +0800418
419 for_each_elem(symtab_section, 1, sym, ElfW(Sym)) {
3a58c53e bellard2002-08-18 13:17:59 +0000420 if (sym->st_shndx == SHN_COMMON) {
421 /* align symbol */
422 align = sym->st_value;
423 offset = bss_section->data_offset;
424 offset = (offset + align - 1) & -align;
425 sym->st_value = offset;
426 sym->st_shndx = bss_section->sh_num;
427 offset += sym->st_size;
428 bss_section->data_offset = offset;
429 }
430 }
431}
432
3a58c53e bellard2002-08-18 13:17:59 +0000433/* relocate symbol table, resolve undefined symbols if do_resolve is
434 true and output error if undefined symbol. */
88a3ccab grischka2009-12-20 01:53:49 +0100435ST_FUNC void relocate_syms(TCCState *s1, int do_resolve)
3a58c53e bellard2002-08-18 13:17:59 +0000436{
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +0800437 ElfW(Sym) *sym, *esym;
3a58c53e bellard2002-08-18 13:17:59 +0000438 int sym_bind, sh_num, sym_index;
439 const char *name;
3a58c53e bellard2002-08-18 13:17:59 +0000440
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +0800441 for_each_elem(symtab_section, 1, sym, ElfW(Sym)) {
3a58c53e bellard2002-08-18 13:17:59 +0000442 sh_num = sym->st_shndx;
443 if (sh_num == SHN_UNDEF) {
62d1da1b Thomas Preud'homme2014-03-09 22:52:31 +0800444 name = (char *) strtab_section->data + sym->st_name;
4aec2902 Thomas Preud'homme2013-12-18 11:17:17 +0800445 /* Use ld.so to resolve symbol for us (for tcc -run) */
3a58c53e bellard2002-08-18 13:17:59 +0000446 if (do_resolve) {
82bcbd02 grischka2013-02-04 16:08:06 +0100447#if defined TCC_IS_NATIVE && !defined _WIN32
035918ef grischka2009-07-18 22:05:58 +0200448 void *addr;
62d1da1b Thomas Preud'homme2014-03-09 22:52:31 +0800449 name = (char *) symtab_section->link->data + sym->st_name;
035918ef grischka2009-07-18 22:05:58 +0200450 addr = resolve_sym(s1, name);
3a58c53e bellard2002-08-18 13:17:59 +0000451 if (addr) {
82bcbd02 grischka2013-02-04 16:08:06 +0100452 sym->st_value = (addr_t)addr;
01c04192 Michael Matz2014-04-06 01:02:42 +0200453#ifdef DEBUG_RELOC
89ad24e7 gus knight2015-07-29 16:53:57 -0400454 printf ("relocate_sym: %s -> 0x%lx\n", name, sym->st_value);
01c04192 Michael Matz2014-04-06 01:02:42 +0200455#endif
3a58c53e bellard2002-08-18 13:17:59 +0000456 goto found;
457 }
370cdeb6 grischka2009-07-06 21:34:22 +0200458#endif
e4c7dd5e bellard2002-11-02 14:13:21 +0000459 } else if (s1->dynsym) {
3a58c53e bellard2002-08-18 13:17:59 +0000460 /* if dynamic symbol exist, then use it */
e4c7dd5e bellard2002-11-02 14:13:21 +0000461 sym_index = find_elf_sym(s1->dynsym, name);
3a58c53e bellard2002-08-18 13:17:59 +0000462 if (sym_index) {
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900463 esym = &((ElfW(Sym) *)s1->dynsym->data)[sym_index];
3a58c53e bellard2002-08-18 13:17:59 +0000464 sym->st_value = esym->st_value;
465 goto found;
466 }
467 }
468 /* XXX: _fp_hw seems to be part of the ABI, so we ignore
469 it */
470 if (!strcmp(name, "_fp_hw"))
471 goto found;
472 /* only weak symbols are accepted to be undefined. Their
473 value is zero */
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900474 sym_bind = ELFW(ST_BIND)(sym->st_info);
3a58c53e bellard2002-08-18 13:17:59 +0000475 if (sym_bind == STB_WEAK) {
476 sym->st_value = 0;
477 } else {
bf374a5f grischka2011-08-11 17:07:56 +0200478 tcc_error_noabort("undefined symbol '%s'", name);
3a58c53e bellard2002-08-18 13:17:59 +0000479 }
480 } else if (sh_num < SHN_LORESERVE) {
481 /* add section base */
e4c7dd5e bellard2002-11-02 14:13:21 +0000482 sym->st_value += s1->sections[sym->st_shndx]->sh_addr;
3a58c53e bellard2002-08-18 13:17:59 +0000483 }
484 found: ;
485 }
486}
487
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +0800488/* relocate a given section (CPU dependent) by applying the relocations
489 in the associated relocation section */
88a3ccab grischka2009-12-20 01:53:49 +0100490ST_FUNC void relocate_section(TCCState *s1, Section *s)
3a58c53e bellard2002-08-18 13:17:59 +0000491{
55f751ac
TP
Thomas Preud'homme2013-12-17 21:02:51 +0800492 Section *sr = s->reloc;
493 ElfW_Rel *rel;
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900494 ElfW(Sym) *sym;
6bbfb8f6 bellard2004-11-07 15:43:15 +0000495 int type, sym_index;
3a58c53e bellard2002-08-18 13:17:59 +0000496 unsigned char *ptr;
82bcbd02 grischka2013-02-04 16:08:06 +0100497 addr_t val, addr;
03c787d6 grischka2009-05-11 18:46:39 +0200498#if defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +0800499 ElfW_Rel *qrel = (ElfW_Rel *) sr->data; /* ptr to next reloc entry reused */
6bbfb8f6 bellard2004-11-07 15:43:15 +0000500 int esym_index;
03c787d6 grischka2009-05-11 18:46:39 +0200501#endif
3a58c53e bellard2002-08-18 13:17:59 +0000502
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +0800503 for_each_elem(sr, 0, rel, ElfW_Rel) {
3a58c53e bellard2002-08-18 13:17:59 +0000504 ptr = s->data + rel->r_offset;
505
7dd792ef
SH
Shinichiro Hamaji2008-11-30 08:14:07 +0900506 sym_index = ELFW(R_SYM)(rel->r_info);
507 sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
3a58c53e bellard2002-08-18 13:17:59 +0000508 val = sym->st_value;
b14ef0e2 Edmund Grimley Evans2015-02-13 18:58:31 +0000509#if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
0a9873aa
SH
Shinichiro Hamaji2008-12-02 03:19:25 +0900510 val += rel->r_addend;
511#endif
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900512 type = ELFW(R_TYPE)(rel->r_info);
3a58c53e bellard2002-08-18 13:17:59 +0000513 addr = s->sh_addr + rel->r_offset;
514
515 /* CPU specific */
516 switch(type) {
4df5bd2e bellard2003-10-14 22:15:56 +0000517#if defined(TCC_TARGET_I386)
3a58c53e bellard2002-08-18 13:17:59 +0000518 case R_386_32:
519 if (s1->output_type == TCC_OUTPUT_DLL) {
e4c7dd5e bellard2002-11-02 14:13:21 +0000520 esym_index = s1->symtab_to_dynsym[sym_index];
3a58c53e bellard2002-08-18 13:17:59 +0000521 qrel->r_offset = rel->r_offset;
522 if (esym_index) {
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900523 qrel->r_info = ELFW(R_INFO)(esym_index, R_386_32);
3a58c53e bellard2002-08-18 13:17:59 +0000524 qrel++;
525 break;
526 } else {
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900527 qrel->r_info = ELFW(R_INFO)(0, R_386_RELATIVE);
3a58c53e bellard2002-08-18 13:17:59 +0000528 qrel++;
529 }
530 }
531 *(int *)ptr += val;
532 break;
533 case R_386_PC32:
534 if (s1->output_type == TCC_OUTPUT_DLL) {
535 /* DLL relocation */
e4c7dd5e bellard2002-11-02 14:13:21 +0000536 esym_index = s1->symtab_to_dynsym[sym_index];
3a58c53e bellard2002-08-18 13:17:59 +0000537 if (esym_index) {
538 qrel->r_offset = rel->r_offset;
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +0900539 qrel->r_info = ELFW(R_INFO)(esym_index, R_386_PC32);
3a58c53e bellard2002-08-18 13:17:59 +0000540 qrel++;
541 break;
542 }
543 }
544 *(int *)ptr += val - addr;
545 break;
546 case R_386_PLT32:
547 *(int *)ptr += val - addr;
548 break;
549 case R_386_GLOB_DAT:
550 case R_386_JMP_SLOT:
551 *(int *)ptr = val;
552 break;
553 case R_386_GOTPC:
e4c7dd5e bellard2002-11-02 14:13:21 +0000554 *(int *)ptr += s1->got->sh_addr - addr;
3a58c53e bellard2002-08-18 13:17:59 +0000555 break;
556 case R_386_GOTOFF:
e4c7dd5e bellard2002-11-02 14:13:21 +0000557 *(int *)ptr += val - s1->got->sh_addr;
3a58c53e bellard2002-08-18 13:17:59 +0000558 break;
559 case R_386_GOT32:
560 /* we load the got offset */
e2212738 Thomas Preud'homme2012-11-04 00:40:05 +0100561 *(int *)ptr += s1->sym_attrs[sym_index].got_offset;
3a58c53e bellard2002-08-18 13:17:59 +0000562 break;
0d768b97
FF
Frederic Feret2009-08-27 09:34:35 +0200563 case R_386_16:
564 if (s1->output_format != TCC_OUTPUT_FORMAT_BINARY) {
565 output_file:
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +0800566 tcc_error("can only produce 16-bit binary files");
0d768b97
FF
Frederic Feret2009-08-27 09:34:35 +0200567 }
568 *(short *)ptr += val;
569 break;
570 case R_386_PC16:
571 if (s1->output_format != TCC_OUTPUT_FORMAT_BINARY)
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +0800572 goto output_file;
0d768b97
FF
Frederic Feret2009-08-27 09:34:35 +0200573 *(short *)ptr += val - addr;
574 break;
4df5bd2e bellard2003-10-14 22:15:56 +0000575#elif defined(TCC_TARGET_ARM)
5342b32e grischka2007-12-19 17:36:42 +0000576 case R_ARM_PC24:
577 case R_ARM_CALL:
578 case R_ARM_JUMP24:
579 case R_ARM_PLT32:
580 {
1b606d18
TP
Thomas Preud'homme2013-11-18 00:03:38 +0800581 int x, is_thumb, is_call, h, blx_avail, is_bl, th_ko;
582 x = (*(int *) ptr) & 0xffffff;
89ad24e7 gus knight2015-07-29 16:53:57 -0400583 if (sym->st_shndx == SHN_UNDEF)
584 val = s1->plt->sh_addr;
01c04192 Michael Matz2014-04-06 01:02:42 +0200585#ifdef DEBUG_RELOC
89ad24e7 gus knight2015-07-29 16:53:57 -0400586 printf ("reloc %d: x=0x%x val=0x%x ", type, x, val);
01c04192 Michael Matz2014-04-06 01:02:42 +0200587#endif
4df5bd2e bellard2003-10-14 22:15:56 +0000588 (*(int *)ptr) &= 0xff000000;
589 if (x & 0x800000)
590 x -= 0x1000000;
c6630ef9 Thomas Preud'homme2012-10-10 00:09:42 +0200591 x <<= 2;
9966fd4e Thomas Preud'homme2012-10-16 00:31:56 +0200592 blx_avail = (TCC_ARM_VERSION >= 5);
c6630ef9 Thomas Preud'homme2012-10-10 00:09:42 +0200593 is_thumb = val & 1;
1b606d18
TP
Thomas Preud'homme2013-11-18 00:03:38 +0800594 is_bl = (*(unsigned *) ptr) >> 24 == 0xeb;
595 is_call = (type == R_ARM_CALL || (type == R_ARM_PC24 && is_bl));
9966fd4e Thomas Preud'homme2012-10-16 00:31:56 +0200596 x += val - addr;
01c04192 Michael Matz2014-04-06 01:02:42 +0200597#ifdef DEBUG_RELOC
89ad24e7 gus knight2015-07-29 16:53:57 -0400598 printf (" newx=0x%x name=%s\n", x,
599 (char *) symtab_section->link->data + sym->st_name);
01c04192 Michael Matz2014-04-06 01:02:42 +0200600#endif
c6630ef9 Thomas Preud'homme2012-10-10 00:09:42 +0200601 h = x & 2;
1b606d18 Thomas Preud'homme2013-11-18 00:03:38 +0800602 th_ko = (x & 3) && (!blx_avail || !is_call);
1b606d18 Thomas Preud'homme2013-11-18 00:03:38 +0800603 if (th_ko || x >= 0x2000000 || x < -0x2000000)
01c04192 Michael Matz2014-04-06 01:02:42 +0200604 tcc_error("can't relocate value at %x,%d",addr, type);
4df5bd2e bellard2003-10-14 22:15:56 +0000605 x >>= 2;
606 x &= 0xffffff;
9966fd4e
TP
Thomas Preud'homme2012-10-16 00:31:56 +0200607 /* Only reached if blx is avail and it is a call */
608 if (is_thumb) {
c6630ef9
TP
Thomas Preud'homme2012-10-10 00:09:42 +0200609 x |= h << 24;
610 (*(int *)ptr) = 0xfa << 24; /* bl -> blx */
611 }
1b606d18 Thomas Preud'homme2013-11-18 00:03:38 +0800612 (*(int *) ptr) |= x;
5342b32e grischka2007-12-19 17:36:42 +0000613 }
614 break;
fad68c91
TP
Thomas Preud'homme2012-10-07 17:48:46 +0200615 /* Since these relocations only concern Thumb-2 and blx instruction was
616 introduced before Thumb-2, we can assume blx is available and not
617 guard its use */
28f02864 Thomas Preud'homme2014-01-08 17:35:35 +0800618 case R_ARM_THM_PC22:
fad68c91 Thomas Preud'homme2012-10-07 17:48:46 +0200619 case R_ARM_THM_JUMP24:
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +0800620 {
fad68c91 Thomas Preud'homme2012-10-07 17:48:46 +0200621 int x, hi, lo, s, j1, j2, i1, i2, imm10, imm11;
e07802e3
TP
Thomas Preud'homme2012-10-28 19:38:38 +0100622 int to_thumb, is_call, to_plt, blx_bit = 1 << 12;
623 Section *plt;
fad68c91
TP
Thomas Preud'homme2012-10-07 17:48:46 +0200624
625 /* weak reference */
626 if (sym->st_shndx == SHN_UNDEF &&
627 ELFW(ST_BIND)(sym->st_info) == STB_WEAK)
628 break;
629
630 /* Get initial offset */
631 hi = (*(uint16_t *)ptr);
632 lo = (*(uint16_t *)(ptr+2));
633 s = (hi >> 10) & 1;
634 j1 = (lo >> 13) & 1;
635 j2 = (lo >> 11) & 1;
636 i1 = (j1 ^ s) ^ 1;
637 i2 = (j2 ^ s) ^ 1;
638 imm10 = hi & 0x3ff;
639 imm11 = lo & 0x7ff;
640 x = (s << 24) | (i1 << 23) | (i2 << 22) |
641 (imm10 << 12) | (imm11 << 1);
642 if (x & 0x01000000)
643 x -= 0x02000000;
644
645 /* Relocation infos */
646 to_thumb = val & 1;
e07802e3
TP
Thomas Preud'homme2012-10-28 19:38:38 +0100647 plt = s1->plt;
648 to_plt = (val >= plt->sh_addr) &&
649 (val < plt->sh_addr + plt->data_offset);
28f02864 Thomas Preud'homme2014-01-08 17:35:35 +0800650 is_call = (type == R_ARM_THM_PC22);
fad68c91
TP
Thomas Preud'homme2012-10-07 17:48:46 +0200651
652 /* Compute final offset */
e07802e3
TP
Thomas Preud'homme2012-10-28 19:38:38 +0100653 if (to_plt && !is_call) /* Point to 1st instr of Thumb stub */
654 x -= 4;
fad68c91
TP
Thomas Preud'homme2012-10-07 17:48:46 +0200655 x += val - addr;
656 if (!to_thumb && is_call) {
657 blx_bit = 0; /* bl -> blx */
658 x = (x + 3) & -4; /* Compute offset from aligned PC */
659 }
660
661 /* Check that relocation is possible
662 * offset must not be out of range
663 * if target is to be entered in arm mode:
664 - bit 1 must not set
e07802e3 Thomas Preud'homme2012-10-28 19:38:38 +0100665 - instruction must be a call (bl) or a jump to PLT */
fad68c91 Thomas Preud'homme2012-10-07 17:48:46 +0200666 if (!to_thumb || x >= 0x1000000 || x < -0x1000000)
e07802e3 Thomas Preud'homme2012-10-28 19:38:38 +0100667 if (to_thumb || (val & 2) || (!is_call && !to_plt))
01c04192 Michael Matz2014-04-06 01:02:42 +0200668 tcc_error("can't relocate value at %x,%d",addr, type);
fad68c91
TP
Thomas Preud'homme2012-10-07 17:48:46 +0200669
670 /* Compute and store final offset */
671 s = (x >> 24) & 1;
672 i1 = (x >> 23) & 1;
673 i2 = (x >> 22) & 1;
674 j1 = s ^ (i1 ^ 1);
675 j2 = s ^ (i2 ^ 1);
676 imm10 = (x >> 12) & 0x3ff;
677 imm11 = (x >> 1) & 0x7ff;
678 (*(uint16_t *)ptr) = (uint16_t) ((hi & 0xf800) |
679 (s << 10) | imm10);
680 (*(uint16_t *)(ptr+2)) = (uint16_t) ((lo & 0xc000) |
681 (j1 << 13) | blx_bit | (j2 << 11) |
682 imm11);
683 }
684 break;
2fe7fd9e
TP
Thomas Preud'homme2012-10-07 17:48:46 +0200685 case R_ARM_MOVT_ABS:
686 case R_ARM_MOVW_ABS_NC:
687 {
688 int x, imm4, imm12;
689 if (type == R_ARM_MOVT_ABS)
690 val >>= 16;
691 imm12 = val & 0xfff;
692 imm4 = (val >> 12) & 0xf;
693 x = (imm4 << 16) | imm12;
694 if (type == R_ARM_THM_MOVT_ABS)
695 *(int *)ptr |= x;
696 else
697 *(int *)ptr += x;
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +0800698 }
2fe7fd9e
TP
Thomas Preud'homme2012-10-07 17:48:46 +0200699 break;
700 case R_ARM_THM_MOVT_ABS:
701 case R_ARM_THM_MOVW_ABS_NC:
702 {
703 int x, i, imm4, imm3, imm8;
704 if (type == R_ARM_THM_MOVT_ABS)
705 val >>= 16;
706 imm8 = val & 0xff;
707 imm3 = (val >> 8) & 0x7;
708 i = (val >> 11) & 1;
709 imm4 = (val >> 12) & 0xf;
710 x = (imm3 << 28) | (imm8 << 16) | (i << 10) | imm4;
711 if (type == R_ARM_THM_MOVT_ABS)
712 *(int *)ptr |= x;
713 else
714 *(int *)ptr += x;
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +0800715 }
2fe7fd9e Thomas Preud'homme2012-10-07 17:48:46 +0200716 break;
5342b32e grischka2007-12-19 17:36:42 +0000717 case R_ARM_PREL31:
718 {
719 int x;
720 x = (*(int *)ptr) & 0x7fffffff;
721 (*(int *)ptr) &= 0x80000000;
722 x = (x * 2) / 2;
723 x += val - addr;
724 if((x^(x>>1))&0x40000000)
01c04192 Michael Matz2014-04-06 01:02:42 +0200725 tcc_error("can't relocate value at %x,%d",addr, type);
5342b32e grischka2007-12-19 17:36:42 +0000726 (*(int *)ptr) |= x & 0x7fffffff;
727 }
728 case R_ARM_ABS32:
729 *(int *)ptr += val;
730 break;
9a81dcab
TP
Thomas Preud'homme2012-06-05 17:02:41 +0200731 case R_ARM_REL32:
732 *(int *)ptr += val - addr;
ed9c6b13 Thomas Preud'homme2012-06-12 17:57:31 +0200733 break;
28f02864 Thomas Preud'homme2014-01-08 17:35:35 +0800734 case R_ARM_GOTPC:
5342b32e grischka2007-12-19 17:36:42 +0000735 *(int *)ptr += s1->got->sh_addr - addr;
736 break;
28f02864 Thomas Preud'homme2014-01-08 17:35:35 +0800737 case R_ARM_GOTOFF:
f99d3de2 grischka2007-12-04 20:38:09 +0000738 *(int *)ptr += val - s1->got->sh_addr;
739 break;
28f02864 Thomas Preud'homme2014-01-08 17:35:35 +0800740 case R_ARM_GOT32:
4df5bd2e bellard2003-10-14 22:15:56 +0000741 /* we load the got offset */
e2212738 Thomas Preud'homme2012-11-04 00:40:05 +0100742 *(int *)ptr += s1->sym_attrs[sym_index].got_offset;
4df5bd2e bellard2003-10-14 22:15:56 +0000743 break;
5342b32e grischka2007-12-19 17:36:42 +0000744 case R_ARM_COPY:
4df5bd2e bellard2003-10-14 22:15:56 +0000745 break;
128e46f9
DG
Daniel Glöckner2010-05-15 01:23:34 +0200746 case R_ARM_V4BX:
747 /* trade Thumb support for ARMv4 support */
748 if ((0x0ffffff0 & *(int*)ptr) == 0x012FFF10)
749 *(int*)ptr ^= 0xE12FFF10 ^ 0xE1A0F000; /* BX Rm -> MOV PC, Rm */
750 break;
01c04192
MM
Michael Matz2014-04-06 01:02:42 +0200751 case R_ARM_GLOB_DAT:
752 case R_ARM_JUMP_SLOT:
753 *(addr_t *)ptr = val;
754 break;
0688afdd
MM
Michael Matz2014-04-04 23:33:04 +0200755 case R_ARM_NONE:
756 /* Nothing to do. Normally used to indicate a dependency
757 on a certain symbol (like for exception handling under EABI). */
758 break;
5342b32e grischka2007-12-19 17:36:42 +0000759 default:
82bcbd02 grischka2013-02-04 16:08:06 +0100760 fprintf(stderr,"FIXME: handle reloc type %x at %x [%p] to %x\n",
761 type, (unsigned)addr, ptr, (unsigned)val);
4df5bd2e bellard2003-10-14 22:15:56 +0000762 break;
b14ef0e2
EGE
Edmund Grimley Evans2015-02-13 18:58:31 +0000763#elif defined(TCC_TARGET_ARM64)
764 case R_AARCH64_ABS64:
765 *(uint64_t *)ptr = val;
766 break;
767 case R_AARCH64_ABS32:
768 *(uint32_t *)ptr = val;
769 break;
770 case R_AARCH64_MOVW_UABS_G0_NC:
771 *(uint32_t *)ptr = (*(uint32_t *)ptr & 0xffe0001f) |
772 (val & 0xffff) << 5;
773 break;
774 case R_AARCH64_MOVW_UABS_G1_NC:
775 *(uint32_t *)ptr = (*(uint32_t *)ptr & 0xffe0001f) |
776 (val >> 16 & 0xffff) << 5;
777 break;
778 case R_AARCH64_MOVW_UABS_G2_NC:
779 *(uint32_t *)ptr = (*(uint32_t *)ptr & 0xffe0001f) |
780 (val >> 32 & 0xffff) << 5;
781 break;
782 case R_AARCH64_MOVW_UABS_G3:
783 *(uint32_t *)ptr = (*(uint32_t *)ptr & 0xffe0001f) |
784 (val >> 48 & 0xffff) << 5;
785 break;
786 case R_AARCH64_ADR_PREL_PG_HI21: {
787 uint64_t off = (val >> 12) - (addr >> 12);
788 if ((off + ((uint64_t)1 << 20)) >> 21)
789 tcc_error("R_AARCH64_ADR_PREL_PG_HI21 relocation failed");
790 *(uint32_t *)ptr = (*(uint32_t *)ptr & 0x9f00001f) |
791 (off & 0x1ffffc) << 3 | (off & 3) << 29;
792 break;
793 }
794 case R_AARCH64_ADD_ABS_LO12_NC:
795 *(uint32_t *)ptr = (*(uint32_t *)ptr & 0xffc003ff) |
796 (val & 0xfff) << 10;
797 break;
798 case R_AARCH64_JUMP26:
799 case R_AARCH64_CALL26:
89ad24e7 gus knight2015-07-29 16:53:57 -0400800 /* This check must match the one in build_got_entries, testing
801 if we really need a PLT slot. */
802 if (sym->st_shndx == SHN_UNDEF)
803 /* We've put the PLT slot offset into r_addend when generating
804 it, and that's what we must use as relocation value (adjusted
805 by section offset of course). */
806 val = s1->plt->sh_addr + rel->r_addend;
6d055312 Michael Matz2015-02-22 05:59:06 +0100807#ifdef DEBUG_RELOC
89ad24e7 gus knight2015-07-29 16:53:57 -0400808 printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr, val,
809 (char *) symtab_section->link->data + sym->st_name);
6d055312 Michael Matz2015-02-22 05:59:06 +0100810#endif
b14ef0e2 Edmund Grimley Evans2015-02-13 18:58:31 +0000811 if (((val - addr) + ((uint64_t)1 << 27)) & ~(uint64_t)0xffffffc)
89ad24e7 gus knight2015-07-29 16:53:57 -0400812 {
6d055312 Michael Matz2015-02-22 05:59:06 +0100813 tcc_error("R_AARCH64_(JUMP|CALL)26 relocation failed (val=%lx, addr=%lx)", addr, val);
89ad24e7 gus knight2015-07-29 16:53:57 -0400814 }
b14ef0e2
EGE
Edmund Grimley Evans2015-02-13 18:58:31 +0000815 *(uint32_t *)ptr = 0x14000000 | (type == R_AARCH64_CALL26) << 31 |
816 ((val - addr) >> 2 & 0x3ffffff);
817 break;
818 case R_AARCH64_ADR_GOT_PAGE: {
819 uint64_t off =
820 (((s1->got->sh_addr +
821 s1->sym_attrs[sym_index].got_offset) >> 12) - (addr >> 12));
822 if ((off + ((uint64_t)1 << 20)) >> 21)
823 tcc_error("R_AARCH64_ADR_GOT_PAGE relocation failed");
824 *(uint32_t *)ptr = (*(uint32_t *)ptr & 0x9f00001f) |
825 (off & 0x1ffffc) << 3 | (off & 3) << 29;
826 break;
827 }
828 case R_AARCH64_LD64_GOT_LO12_NC:
829 *(uint32_t *)ptr = (*(uint32_t *)ptr & 0xfff803ff) |
830 ((s1->got->sh_addr + s1->sym_attrs[sym_index].got_offset)
831 & 0xff8) << 7;
832 break;
833 case R_AARCH64_COPY:
6d055312
MM
Michael Matz2015-02-22 05:59:06 +0100834 break;
835 case R_AARCH64_GLOB_DAT:
836 case R_AARCH64_JUMP_SLOT:
837 /* They don't need addend */
838#ifdef DEBUG_RELOC
89ad24e7 gus knight2015-07-29 16:53:57 -0400839 printf ("reloc %d @ 0x%lx: val=0x%lx name=%s\n", type, addr,
840 val - rel->r_addend,
841 (char *) symtab_section->link->data + sym->st_name);
6d055312
MM
Michael Matz2015-02-22 05:59:06 +0100842#endif
843 *(addr_t *)ptr = val - rel->r_addend;
844 break;
b14ef0e2
EGE
Edmund Grimley Evans2015-02-13 18:58:31 +0000845 default:
846 fprintf(stderr, "FIXME: handle reloc type %x at %x [%p] to %x\n",
847 type, (unsigned)addr, ptr, (unsigned)val);
848 break;
79c72b24 bellard2004-10-04 21:57:35 +0000849#elif defined(TCC_TARGET_C67)
5342b32e grischka2007-12-19 17:36:42 +0000850 case R_C60_32:
851 *(int *)ptr += val;
852 break;
ec7d3632 bellard2004-10-05 22:33:55 +0000853 case R_C60LO16:
854 {
855 uint32_t orig;
3d4b57ff
TP
Thomas Preud'homme2013-12-17 20:59:14 +0800856
857 /* put the low 16 bits of the absolute address
858 add to what is already there */
859
ec7d3632 bellard2004-10-05 22:33:55 +0000860 orig = ((*(int *)(ptr )) >> 7) & 0xffff;
861 orig |= (((*(int *)(ptr+4)) >> 7) & 0xffff) << 16;
3d4b57ff
TP
Thomas Preud'homme2013-12-17 20:59:14 +0800862
863 /* patch both at once - assumes always in pairs Low - High */
864
ec7d3632 bellard2004-10-05 22:33:55 +0000865 *(int *) ptr = (*(int *) ptr & (~(0xffff << 7)) ) | (((val+orig) & 0xffff) << 7);
866 *(int *)(ptr+4) = (*(int *)(ptr+4) & (~(0xffff << 7)) ) | ((((val+orig)>>16) & 0xffff) << 7);
867 }
868 break;
869 case R_C60HI16:
870 break;
79c72b24 bellard2004-10-04 21:57:35 +0000871 default:
82bcbd02 grischka2013-02-04 16:08:06 +0100872 fprintf(stderr,"FIXME: handle reloc type %x at %x [%p] to %x\n",
873 type, (unsigned)addr, ptr, (unsigned)val);
79c72b24 bellard2004-10-04 21:57:35 +0000874 break;
0a9873aa
SH
Shinichiro Hamaji2008-12-02 03:19:25 +0900875#elif defined(TCC_TARGET_X86_64)
876 case R_X86_64_64:
fe8f230a Shinichiro Hamaji2009-03-21 12:04:35 +0900877 if (s1->output_type == TCC_OUTPUT_DLL) {
080ad7e6
MM
Michael Matz2014-03-31 03:45:35 +0200878 esym_index = s1->symtab_to_dynsym[sym_index];
879 qrel->r_offset = rel->r_offset;
880 if (esym_index) {
881 qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_64);
89ad24e7 gus knight2015-07-29 16:53:57 -0400882 qrel->r_addend = rel->r_addend;
080ad7e6
MM
Michael Matz2014-03-31 03:45:35 +0200883 qrel++;
884 break;
885 } else {
89ad24e7 gus knight2015-07-29 16:53:57 -0400886 qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE);
887 qrel->r_addend = *(long long *)ptr + val;
080ad7e6
MM
Michael Matz2014-03-31 03:45:35 +0200888 qrel++;
889 }
fe8f230a Shinichiro Hamaji2009-03-21 12:04:35 +0900890 }
0a9873aa
SH
Shinichiro Hamaji2008-12-02 03:19:25 +0900891 *(long long *)ptr += val;
892 break;
893 case R_X86_64_32:
894 case R_X86_64_32S:
fe8f230a
SH
Shinichiro Hamaji2009-03-21 12:04:35 +0900895 if (s1->output_type == TCC_OUTPUT_DLL) {
896 /* XXX: this logic may depend on TCC's codegen
897 now TCC uses R_X86_64_32 even for a 64bit pointer */
898 qrel->r_info = ELFW(R_INFO)(0, R_X86_64_RELATIVE);
899 qrel->r_addend = *(int *)ptr + val;
900 qrel++;
901 }
0a9873aa
SH
Shinichiro Hamaji2008-12-02 03:19:25 +0900902 *(int *)ptr += val;
903 break;
0ae39f19
SH
Shinichiro Hamaji2010-12-28 16:14:30 +0900904
905 case R_X86_64_PC32:
fe8f230a
SH
Shinichiro Hamaji2009-03-21 12:04:35 +0900906 if (s1->output_type == TCC_OUTPUT_DLL) {
907 /* DLL relocation */
908 esym_index = s1->symtab_to_dynsym[sym_index];
909 if (esym_index) {
910 qrel->r_offset = rel->r_offset;
911 qrel->r_info = ELFW(R_INFO)(esym_index, R_X86_64_PC32);
912 qrel->r_addend = *(int *)ptr;
913 qrel++;
914 break;
915 }
916 }
0bd12820
MM
Michael Matz2014-03-31 05:36:12 +0200917 goto plt32pc32;
918
919 case R_X86_64_PLT32:
89ad24e7 gus knight2015-07-29 16:53:57 -0400920 /* We've put the PLT slot offset into r_addend when generating
921 it, and that's what we must use as relocation value (adjusted
922 by section offset of course). */
923 val = s1->plt->sh_addr + rel->r_addend;
924 /* fallthrough. */
925
926 plt32pc32:
927 {
928 long long diff;
929 diff = (long long)val - addr;
930 if (diff < -2147483648LL || diff > 2147483647LL) {
931 tcc_error("internal error: relocation failed");
0a9873aa Shinichiro Hamaji2008-12-02 03:19:25 +0900932 }
89ad24e7 gus knight2015-07-29 16:53:57 -0400933 *(int *)ptr += diff;
934 }
0a9873aa Shinichiro Hamaji2008-12-02 03:19:25 +0900935 break;
0a9873aa
SH
Shinichiro Hamaji2008-12-02 03:19:25 +0900936 case R_X86_64_GLOB_DAT:
937 case R_X86_64_JUMP_SLOT:
0ae39f19 Shinichiro Hamaji2010-12-28 16:14:30 +0900938 /* They don't need addend */
9750d0b7 Michael Matz2014-04-06 00:30:22 +0200939 *(addr_t *)ptr = val - rel->r_addend;
0a9873aa
SH
Shinichiro Hamaji2008-12-02 03:19:25 +0900940 break;
941 case R_X86_64_GOTPCREL:
830b7533 Shinichiro Hamaji2009-04-13 00:27:04 +0900942 *(int *)ptr += (s1->got->sh_addr - addr +
e2212738 Thomas Preud'homme2012-11-04 00:40:05 +0100943 s1->sym_attrs[sym_index].got_offset - 4);
0a9873aa
SH
Shinichiro Hamaji2008-12-02 03:19:25 +0900944 break;
945 case R_X86_64_GOTTPOFF:
946 *(int *)ptr += val - s1->got->sh_addr;
947 break;
948 case R_X86_64_GOT32:
949 /* we load the got offset */
e2212738 Thomas Preud'homme2012-11-04 00:40:05 +0100950 *(int *)ptr += s1->sym_attrs[sym_index].got_offset;
0a9873aa Shinichiro Hamaji2008-12-02 03:19:25 +0900951 break;
4df5bd2e bellard2003-10-14 22:15:56 +0000952#else
953#error unsupported processor
954#endif
3a58c53e bellard2002-08-18 13:17:59 +0000955 }
956 }
957 /* if the relocation is allocated, we change its symbol table */
958 if (sr->sh_flags & SHF_ALLOC)
e4c7dd5e bellard2002-11-02 14:13:21 +0000959 sr->link = s1->dynsym;
3a58c53e bellard2002-08-18 13:17:59 +0000960}
961
962/* relocate relocation table in 'sr' */
e4c7dd5e bellard2002-11-02 14:13:21 +0000963static void relocate_rel(TCCState *s1, Section *sr)
3a58c53e bellard2002-08-18 13:17:59 +0000964{
965 Section *s;
55f751ac
TP
Thomas Preud'homme2013-12-17 21:02:51 +0800966 ElfW_Rel *rel;
967
e4c7dd5e bellard2002-11-02 14:13:21 +0000968 s = s1->sections[sr->sh_info];
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +0800969 for_each_elem(sr, 0, rel, ElfW_Rel)
3a58c53e bellard2002-08-18 13:17:59 +0000970 rel->r_offset += s->sh_addr;
3a58c53e bellard2002-08-18 13:17:59 +0000971}
972
973/* count the number of dynamic relocations so that we can reserve
974 their space */
e4c7dd5e bellard2002-11-02 14:13:21 +0000975static int prepare_dynamic_rel(TCCState *s1, Section *sr)
3a58c53e bellard2002-08-18 13:17:59 +0000976{
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +0800977 ElfW_Rel *rel;
3a58c53e bellard2002-08-18 13:17:59 +0000978 int sym_index, esym_index, type, count;
979
980 count = 0;
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +0800981 for_each_elem(sr, 0, rel, ElfW_Rel) {
7dd792ef
SH
Shinichiro Hamaji2008-11-30 08:14:07 +0900982 sym_index = ELFW(R_SYM)(rel->r_info);
983 type = ELFW(R_TYPE)(rel->r_info);
3a58c53e bellard2002-08-18 13:17:59 +0000984 switch(type) {
fe8f230a Shinichiro Hamaji2009-03-21 12:04:35 +0900985#if defined(TCC_TARGET_I386)
3a58c53e bellard2002-08-18 13:17:59 +0000986 case R_386_32:
fe8f230a
SH
Shinichiro Hamaji2009-03-21 12:04:35 +0900987#elif defined(TCC_TARGET_X86_64)
988 case R_X86_64_32:
989 case R_X86_64_32S:
97072b3c Shinichiro Hamaji2009-04-05 02:07:19 +0900990 case R_X86_64_64:
fe8f230a Shinichiro Hamaji2009-03-21 12:04:35 +0900991#endif
3a58c53e bellard2002-08-18 13:17:59 +0000992 count++;
993 break;
fe8f230a Shinichiro Hamaji2009-03-21 12:04:35 +0900994#if defined(TCC_TARGET_I386)
3a58c53e bellard2002-08-18 13:17:59 +0000995 case R_386_PC32:
fe8f230a
SH
Shinichiro Hamaji2009-03-21 12:04:35 +0900996#elif defined(TCC_TARGET_X86_64)
997 case R_X86_64_PC32:
998#endif
e4c7dd5e bellard2002-11-02 14:13:21 +0000999 esym_index = s1->symtab_to_dynsym[sym_index];
3a58c53e bellard2002-08-18 13:17:59 +00001000 if (esym_index)
1001 count++;
1002 break;
1003 default:
1004 break;
1005 }
1006 }
1007 if (count) {
1008 /* allocate the section */
1009 sr->sh_flags |= SHF_ALLOC;
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09001010 sr->sh_size = count * sizeof(ElfW_Rel);
3a58c53e bellard2002-08-18 13:17:59 +00001011 }
1012 return count;
1013}
1014
e2212738 Thomas Preud'homme2012-11-04 00:40:05 +01001015static struct sym_attr *alloc_sym_attr(TCCState *s1, int index)
3a58c53e bellard2002-08-18 13:17:59 +00001016{
1017 int n;
e2212738 Thomas Preud'homme2012-11-04 00:40:05 +01001018 struct sym_attr *tab;
3a58c53e bellard2002-08-18 13:17:59 +00001019
e2212738 Thomas Preud'homme2012-11-04 00:40:05 +01001020 if (index >= s1->nb_sym_attrs) {
3a58c53e bellard2002-08-18 13:17:59 +00001021 /* find immediately bigger power of 2 and reallocate array */
1022 n = 1;
1023 while (index >= n)
1024 n *= 2;
e2212738
TP
Thomas Preud'homme2012-11-04 00:40:05 +01001025 tab = tcc_realloc(s1->sym_attrs, n * sizeof(*s1->sym_attrs));
1026 s1->sym_attrs = tab;
1027 memset(s1->sym_attrs + s1->nb_sym_attrs, 0,
1028 (n - s1->nb_sym_attrs) * sizeof(*s1->sym_attrs));
1029 s1->nb_sym_attrs = n;
3a58c53e bellard2002-08-18 13:17:59 +00001030 }
e2212738 Thomas Preud'homme2012-11-04 00:40:05 +01001031 return &s1->sym_attrs[index];
3a58c53e bellard2002-08-18 13:17:59 +00001032}
1033
1034/* XXX: suppress that */
c2e6daaf bellard2003-04-13 14:38:05 +00001035static void put32(unsigned char *p, uint32_t val)
3a58c53e bellard2002-08-18 13:17:59 +00001036{
1037 p[0] = val;
1038 p[1] = val >> 8;
1039 p[2] = val >> 16;
1040 p[3] = val >> 24;
1041}
1042
0a9873aa Shinichiro Hamaji2008-12-02 03:19:25 +09001043#if defined(TCC_TARGET_I386) || defined(TCC_TARGET_ARM) || \
b14ef0e2 Edmund Grimley Evans2015-02-13 18:58:31 +00001044 defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
c2e6daaf bellard2003-04-13 14:38:05 +00001045static uint32_t get32(unsigned char *p)
1046{
1047 return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
1048}
6bbfb8f6 bellard2004-11-07 15:43:15 +00001049#endif
c2e6daaf bellard2003-04-13 14:38:05 +00001050
e4c7dd5e bellard2002-11-02 14:13:21 +00001051static void build_got(TCCState *s1)
3a58c53e bellard2002-08-18 13:17:59 +00001052{
1053 unsigned char *ptr;
1054
1055 /* if no got, then create it */
e4c7dd5e bellard2002-11-02 14:13:21 +00001056 s1->got = new_section(s1, ".got", SHT_PROGBITS, SHF_ALLOC | SHF_WRITE);
1057 s1->got->sh_entsize = 4;
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001058 add_elf_sym(symtab_section, 0, 4, ELFW(ST_INFO)(STB_GLOBAL, STT_OBJECT),
d733dc75 bellard2005-04-13 21:37:06 +00001059 0, s1->got->sh_num, "_GLOBAL_OFFSET_TABLE_");
27d23342 Shinichiro Hamaji2008-12-01 02:52:08 +09001060 ptr = section_ptr_add(s1->got, 3 * PTR_SIZE);
ba8c95a9 Shinichiro Hamaji2008-12-01 02:57:11 +09001061#if PTR_SIZE == 4
3a58c53e bellard2002-08-18 13:17:59 +00001062 /* keep space for _DYNAMIC pointer, if present */
1063 put32(ptr, 0);
1064 /* two dummy got entries */
1065 put32(ptr + 4, 0);
1066 put32(ptr + 8, 0);
27d23342
SH
Shinichiro Hamaji2008-12-01 02:52:08 +09001067#else
1068 /* keep space for _DYNAMIC pointer, if present */
1069 put32(ptr, 0);
1070 put32(ptr + 4, 0);
1071 /* two dummy got entries */
1072 put32(ptr + 8, 0);
1073 put32(ptr + 12, 0);
1074 put32(ptr + 16, 0);
1075 put32(ptr + 20, 0);
1076#endif
3a58c53e bellard2002-08-18 13:17:59 +00001077}
1078
0bd12820
MM
Michael Matz2014-03-31 05:36:12 +02001079/* put a got or plt entry corresponding to a symbol in symtab_section. 'size'
1080 and 'info' can be modifed if more precise info comes from the DLL.
1081 Returns offset of GOT or PLT slot. */
1082static unsigned long put_got_entry(TCCState *s1,
89ad24e7 gus knight2015-07-29 16:53:57 -04001083 int reloc_type, unsigned long size, int info,
1084 int sym_index)
3a58c53e bellard2002-08-18 13:17:59 +00001085{
0bd12820 Michael Matz2014-03-31 05:36:12 +02001086 int index, need_plt_entry;
3a58c53e bellard2002-08-18 13:17:59 +00001087 const char *name;
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09001088 ElfW(Sym) *sym;
3a58c53e bellard2002-08-18 13:17:59 +00001089 unsigned long offset;
1090 int *ptr;
080ad7e6 Michael Matz2014-03-31 03:45:35 +02001091 struct sym_attr *symattr;
3a58c53e bellard2002-08-18 13:17:59 +00001092
e4c7dd5e bellard2002-11-02 14:13:21 +00001093 if (!s1->got)
1094 build_got(s1);
3a58c53e bellard2002-08-18 13:17:59 +00001095
9750d0b7 Michael Matz2014-04-06 00:30:22 +02001096 need_plt_entry =
dc8ea93b
TP
Thomas Preud'homme2014-03-25 22:35:11 +08001097#ifdef TCC_TARGET_X86_64
1098 (reloc_type == R_X86_64_JUMP_SLOT);
1099#elif defined(TCC_TARGET_I386)
1100 (reloc_type == R_386_JMP_SLOT);
1101#elif defined(TCC_TARGET_ARM)
1102 (reloc_type == R_ARM_JUMP_SLOT);
b14ef0e2
EGE
Edmund Grimley Evans2015-02-13 18:58:31 +00001103#elif defined(TCC_TARGET_ARM64)
1104 (reloc_type == R_AARCH64_JUMP_SLOT);
dc8ea93b
TP
Thomas Preud'homme2014-03-25 22:35:11 +08001105#else
1106 0;
1107#endif
1108
9750d0b7 Michael Matz2014-04-06 00:30:22 +02001109 if (need_plt_entry && !s1->plt) {
89ad24e7 gus knight2015-07-29 16:53:57 -04001110 /* add PLT */
1111 s1->plt = new_section(s1, ".plt", SHT_PROGBITS,
1112 SHF_ALLOC | SHF_EXECINSTR);
1113 s1->plt->sh_entsize = 4;
9750d0b7
MM
Michael Matz2014-04-06 00:30:22 +02001114 }
1115
0bd12820
MM
Michael Matz2014-03-31 05:36:12 +02001116 /* If a got/plt entry already exists for that symbol, no need to add one */
1117 if (sym_index < s1->nb_sym_attrs) {
89ad24e7 gus knight2015-07-29 16:53:57 -04001118 if (need_plt_entry && s1->sym_attrs[sym_index].plt_offset)
1119 return s1->sym_attrs[sym_index].plt_offset;
1120 else if (!need_plt_entry && s1->sym_attrs[sym_index].got_offset)
1121 return s1->sym_attrs[sym_index].got_offset;
dc8ea93b Thomas Preud'homme2014-03-25 22:35:11 +08001122 }
e2212738 Thomas Preud'homme2012-11-04 00:40:05 +01001123
080ad7e6 Michael Matz2014-03-31 03:45:35 +02001124 symattr = alloc_sym_attr(s1, sym_index);
0bd12820 Michael Matz2014-03-31 05:36:12 +02001125
080ad7e6
MM
Michael Matz2014-03-31 03:45:35 +02001126 /* Only store the GOT offset if it's not generated for the PLT entry. */
1127 if (!need_plt_entry)
1128 symattr->got_offset = s1->got->data_offset;
3a58c53e bellard2002-08-18 13:17:59 +00001129
9750d0b7
MM
Michael Matz2014-04-06 00:30:22 +02001130 sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
1131 name = (char *) symtab_section->link->data + sym->st_name;
1132 offset = sym->st_value;
0a9873aa Shinichiro Hamaji2008-12-02 03:19:25 +09001133#if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
dc8ea93b Thomas Preud'homme2014-03-25 22:35:11 +08001134 if (need_plt_entry) {
c2e6daaf bellard2003-04-13 14:38:05 +00001135 Section *plt;
1136 uint8_t *p;
1137 int modrm;
89ad24e7 gus knight2015-07-29 16:53:57 -04001138 unsigned long relofs;
c2e6daaf bellard2003-04-13 14:38:05 +00001139
040ef000
SH
Shinichiro Hamaji2009-03-31 22:17:36 +09001140#if defined(TCC_OUTPUT_DLL_WITH_PLT)
1141 modrm = 0x25;
1142#else
c2e6daaf bellard2003-04-13 14:38:05 +00001143 /* if we build a DLL, we add a %ebx offset */
1144 if (s1->output_type == TCC_OUTPUT_DLL)
1145 modrm = 0xa3;
1146 else
1147 modrm = 0x25;
040ef000 Shinichiro Hamaji2009-03-31 22:17:36 +09001148#endif
c2e6daaf bellard2003-04-13 14:38:05 +00001149
1150 /* add a PLT entry */
1151 plt = s1->plt;
1152 if (plt->data_offset == 0) {
1153 /* first plt entry */
1154 p = section_ptr_add(plt, 16);
27d23342 Shinichiro Hamaji2008-12-01 02:52:08 +09001155 p[0] = 0xff; /* pushl got + PTR_SIZE */
c2e6daaf bellard2003-04-13 14:38:05 +00001156 p[1] = modrm + 0x10;
27d23342
SH
Shinichiro Hamaji2008-12-01 02:52:08 +09001157 put32(p + 2, PTR_SIZE);
1158 p[6] = 0xff; /* jmp *(got + PTR_SIZE * 2) */
c2e6daaf bellard2003-04-13 14:38:05 +00001159 p[7] = modrm;
27d23342 Shinichiro Hamaji2008-12-01 02:52:08 +09001160 put32(p + 8, PTR_SIZE * 2);
c2e6daaf bellard2003-04-13 14:38:05 +00001161 }
1162
89ad24e7 gus knight2015-07-29 16:53:57 -04001163 /* The PLT slot refers to the relocation entry it needs
1164 via offset. The reloc entry is created below, so its
1165 offset is the current data_offset. */
1166 relofs = s1->got->reloc ? s1->got->reloc->data_offset : 0;
0bd12820 Michael Matz2014-03-31 05:36:12 +02001167 symattr->plt_offset = plt->data_offset;
c2e6daaf bellard2003-04-13 14:38:05 +00001168 p = section_ptr_add(plt, 16);
1169 p[0] = 0xff; /* jmp *(got + x) */
1170 p[1] = modrm;
1171 put32(p + 2, s1->got->data_offset);
1172 p[6] = 0x68; /* push $xxx */
080ad7e6 Michael Matz2014-03-31 03:45:35 +02001173#ifdef TCC_TARGET_X86_64
89ad24e7 gus knight2015-07-29 16:53:57 -04001174 /* On x86-64, the relocation is referred to by _index_. */
1175 put32(p + 7, relofs / sizeof (ElfW_Rel));
080ad7e6
MM
Michael Matz2014-03-31 03:45:35 +02001176#else
1177 put32(p + 7, relofs);
1178#endif
c2e6daaf bellard2003-04-13 14:38:05 +00001179 p[11] = 0xe9; /* jmp plt_start */
1180 put32(p + 12, -(plt->data_offset));
1181
89ad24e7 gus knight2015-07-29 16:53:57 -04001182 /* If this was an UNDEF symbol set the offset in the
1183 dynsymtab to the PLT slot, so that PC32 relocs to it
1184 can be resolved. */
1185 if (sym->st_shndx == SHN_UNDEF)
1186 offset = plt->data_offset - 16;
1187 }
4df5bd2e bellard2003-10-14 22:15:56 +00001188#elif defined(TCC_TARGET_ARM)
dc8ea93b Thomas Preud'homme2014-03-25 22:35:11 +08001189 if (need_plt_entry) {
4df5bd2e bellard2003-10-14 22:15:56 +00001190 Section *plt;
1191 uint8_t *p;
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001192
4df5bd2e bellard2003-10-14 22:15:56 +00001193 /* if we build a DLL, we add a %ebx offset */
1194 if (s1->output_type == TCC_OUTPUT_DLL)
bf374a5f grischka2011-08-11 17:07:56 +02001195 tcc_error("DLLs unimplemented!");
4df5bd2e bellard2003-10-14 22:15:56 +00001196
1197 /* add a PLT entry */
1198 plt = s1->plt;
1199 if (plt->data_offset == 0) {
1200 /* first plt entry */
1201 p = section_ptr_add(plt, 16);
599677a5
TP
Thomas Preud'homme2013-12-17 21:01:05 +08001202 put32(p, 0xe52de004); /* push {lr} */
1203 put32(p+4, 0xe59fe010); /* ldr lr, [pc, #16] */
1204 put32(p+8, 0xe08fe00e); /* add lr, pc, lr */
1205 put32(p+12, 0xe5bef008); /* ldr pc, [lr, #8]! */
4df5bd2e bellard2003-10-14 22:15:56 +00001206 }
1207
0bd12820 Michael Matz2014-03-31 05:36:12 +02001208 symattr->plt_offset = plt->data_offset;
080ad7e6 Michael Matz2014-03-31 03:45:35 +02001209 if (symattr->plt_thumb_stub) {
e2212738 Thomas Preud'homme2012-11-04 00:40:05 +01001210 p = section_ptr_add(plt, 20);
599677a5 Thomas Preud'homme2013-12-17 21:01:05 +08001211 put32(p, 0x4778); /* bx pc */
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001212 put32(p+2, 0x46c0); /* nop */
e2212738
TP
Thomas Preud'homme2012-11-04 00:40:05 +01001213 p += 4;
1214 } else
1215 p = section_ptr_add(plt, 16);
599677a5
TP
Thomas Preud'homme2013-12-17 21:01:05 +08001216 put32(p, 0xe59fc004); /* ldr ip, [pc, #4] ; GOT entry offset */
1217 put32(p+4, 0xe08fc00c); /* add ip, pc, ip ; addr of GOT entry */
1218 put32(p+8, 0xe59cf000); /* ldr pc, [ip] ; jump to GOT entry */
1219 put32(p+12, s1->got->data_offset); /* GOT entry off once patched */
4df5bd2e bellard2003-10-14 22:15:56 +00001220
1221 /* the symbol is modified so that it will be relocated to
1222 the PLT */
89ad24e7 gus knight2015-07-29 16:53:57 -04001223 if (sym->st_shndx == SHN_UNDEF)
4df5bd2e bellard2003-10-14 22:15:56 +00001224 offset = plt->data_offset - 16;
89ad24e7 gus knight2015-07-29 16:53:57 -04001225 }
b14ef0e2
EGE
Edmund Grimley Evans2015-02-13 18:58:31 +00001226#elif defined(TCC_TARGET_ARM64)
1227 if (need_plt_entry) {
1228 Section *plt;
1229 uint8_t *p;
1230
1231 if (s1->output_type == TCC_OUTPUT_DLL)
1232 tcc_error("DLLs unimplemented!");
1233
1234 plt = s1->plt;
1235 if (plt->data_offset == 0)
1236 section_ptr_add(plt, 32);
6d055312 Michael Matz2015-02-22 05:59:06 +01001237 symattr->plt_offset = plt->data_offset;
b14ef0e2
EGE
Edmund Grimley Evans2015-02-13 18:58:31 +00001238 p = section_ptr_add(plt, 16);
1239 put32(p, s1->got->data_offset);
1240 put32(p + 4, (uint64_t)s1->got->data_offset >> 32);
1241
1242 if (sym->st_shndx == SHN_UNDEF)
1243 offset = plt->data_offset - 16;
1244 }
79c72b24 bellard2004-10-04 21:57:35 +00001245#elif defined(TCC_TARGET_C67)
9750d0b7 Michael Matz2014-04-06 00:30:22 +02001246 if (s1->dynsym) {
bf374a5f grischka2011-08-11 17:07:56 +02001247 tcc_error("C67 got not implemented");
9750d0b7 Michael Matz2014-04-06 00:30:22 +02001248 }
4df5bd2e bellard2003-10-14 22:15:56 +00001249#else
1250#error unsupported CPU
1251#endif
9750d0b7 Michael Matz2014-04-06 00:30:22 +02001252 if (s1->dynsym) {
89ad24e7 gus knight2015-07-29 16:53:57 -04001253 /* XXX This might generate multiple syms for name. */
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001254 index = put_elf_sym(s1->dynsym, offset,
3a58c53e bellard2002-08-18 13:17:59 +00001255 size, info, 0, sym->st_shndx, name);
080ad7e6 Michael Matz2014-03-31 03:45:35 +02001256 /* Create the relocation (it's against the GOT for PLT
89ad24e7 gus knight2015-07-29 16:53:57 -04001257 and GOT relocs). */
3d4b57ff
TP
Thomas Preud'homme2013-12-17 20:59:14 +08001258 put_elf_reloc(s1->dynsym, s1->got,
1259 s1->got->data_offset,
3a58c53e bellard2002-08-18 13:17:59 +00001260 reloc_type, index);
2024c445 Michael Matz2014-04-04 17:54:52 +02001261 } else {
89ad24e7 gus knight2015-07-29 16:53:57 -04001262 /* Without .dynsym (i.e. static link or memory output) we
1263 still need relocs against the generated got, so as to fill
1264 the entries with the symbol values (determined later). */
1265 put_elf_reloc(symtab_section, s1->got,
1266 s1->got->data_offset,
1267 reloc_type, sym_index);
3a58c53e bellard2002-08-18 13:17:59 +00001268 }
080ad7e6 Michael Matz2014-03-31 03:45:35 +02001269 /* And now create the GOT slot itself. */
27d23342 Shinichiro Hamaji2008-12-01 02:52:08 +09001270 ptr = section_ptr_add(s1->got, PTR_SIZE);
3a58c53e bellard2002-08-18 13:17:59 +00001271 *ptr = 0;
0bd12820 Michael Matz2014-03-31 05:36:12 +02001272 if (need_plt_entry)
89ad24e7 gus knight2015-07-29 16:53:57 -04001273 return symattr->plt_offset;
0bd12820 Michael Matz2014-03-31 05:36:12 +02001274 else
89ad24e7 gus knight2015-07-29 16:53:57 -04001275 return symattr->got_offset;
3a58c53e bellard2002-08-18 13:17:59 +00001276}
1277
1278/* build GOT and PLT entries */
88a3ccab grischka2009-12-20 01:53:49 +01001279ST_FUNC void build_got_entries(TCCState *s1)
3a58c53e bellard2002-08-18 13:17:59 +00001280{
ee06ef9d Thomas Preud'homme2011-05-16 14:15:32 +02001281 Section *s;
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +08001282 ElfW_Rel *rel;
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09001283 ElfW(Sym) *sym;
3a58c53e bellard2002-08-18 13:17:59 +00001284 int i, type, reloc_type, sym_index;
1285
e4c7dd5e bellard2002-11-02 14:13:21 +00001286 for(i = 1; i < s1->nb_sections; i++) {
1287 s = s1->sections[i];
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09001288 if (s->sh_type != SHT_RELX)
3a58c53e bellard2002-08-18 13:17:59 +00001289 continue;
1290 /* no need to handle got relocations */
1291 if (s->link != symtab_section)
1292 continue;
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +08001293 for_each_elem(s, 0, rel, ElfW_Rel) {
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09001294 type = ELFW(R_TYPE)(rel->r_info);
3a58c53e bellard2002-08-18 13:17:59 +00001295 switch(type) {
4df5bd2e bellard2003-10-14 22:15:56 +00001296#if defined(TCC_TARGET_I386)
3a58c53e bellard2002-08-18 13:17:59 +00001297 case R_386_GOT32:
1298 case R_386_GOTOFF:
1299 case R_386_GOTPC:
1300 case R_386_PLT32:
e4c7dd5e bellard2002-11-02 14:13:21 +00001301 if (!s1->got)
1302 build_got(s1);
3a58c53e bellard2002-08-18 13:17:59 +00001303 if (type == R_386_GOT32 || type == R_386_PLT32) {
7dd792ef
SH
Shinichiro Hamaji2008-11-30 08:14:07 +09001304 sym_index = ELFW(R_SYM)(rel->r_info);
1305 sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
3a58c53e bellard2002-08-18 13:17:59 +00001306 /* look at the symbol got offset. If none, then add one */
1307 if (type == R_386_GOT32)
1308 reloc_type = R_386_GLOB_DAT;
1309 else
1310 reloc_type = R_386_JMP_SLOT;
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001311 put_got_entry(s1, reloc_type, sym->st_size, sym->st_info,
3a58c53e bellard2002-08-18 13:17:59 +00001312 sym_index);
1313 }
1314 break;
4df5bd2e bellard2003-10-14 22:15:56 +00001315#elif defined(TCC_TARGET_ARM)
01c04192
MM
Michael Matz2014-04-06 01:02:42 +02001316 case R_ARM_PC24:
1317 case R_ARM_CALL:
1318 case R_ARM_JUMP24:
28f02864
TP
Thomas Preud'homme2014-01-08 17:35:35 +08001319 case R_ARM_GOT32:
1320 case R_ARM_GOTOFF:
1321 case R_ARM_GOTPC:
4df5bd2e bellard2003-10-14 22:15:56 +00001322 case R_ARM_PLT32:
1323 if (!s1->got)
1324 build_got(s1);
01c04192
MM
Michael Matz2014-04-06 01:02:42 +02001325 sym_index = ELFW(R_SYM)(rel->r_info);
1326 sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
89ad24e7 gus knight2015-07-29 16:53:57 -04001327 if (type != R_ARM_GOTOFF && type != R_ARM_GOTPC
1328 && sym->st_shndx == SHN_UNDEF) {
01c04192 Michael Matz2014-04-06 01:02:42 +02001329 unsigned long ofs;
4df5bd2e bellard2003-10-14 22:15:56 +00001330 /* look at the symbol got offset. If none, then add one */
28f02864 Thomas Preud'homme2014-01-08 17:35:35 +08001331 if (type == R_ARM_GOT32)
4df5bd2e bellard2003-10-14 22:15:56 +00001332 reloc_type = R_ARM_GLOB_DAT;
1333 else
1334 reloc_type = R_ARM_JUMP_SLOT;
01c04192 Michael Matz2014-04-06 01:02:42 +02001335 ofs = put_got_entry(s1, reloc_type, sym->st_size,
89ad24e7 gus knight2015-07-29 16:53:57 -04001336 sym->st_info, sym_index);
01c04192 Michael Matz2014-04-06 01:02:42 +02001337#ifdef DEBUG_RELOC
89ad24e7 gus knight2015-07-29 16:53:57 -04001338 printf ("maybegot: %s, %d, %d --> ofs=0x%x\n",
1339 (char *) symtab_section->link->data + sym->st_name,
1340 type, sym->st_shndx, ofs);
01c04192 Michael Matz2014-04-06 01:02:42 +02001341#endif
89ad24e7 gus knight2015-07-29 16:53:57 -04001342 if (type != R_ARM_GOT32) {
1343 addr_t *ptr = (addr_t*)(s1->sections[s->sh_info]->data
1344 + rel->r_offset);
1345 /* x must be signed! */
1346 int x = *ptr & 0xffffff;
1347 x = (x << 8) >> 8;
1348 x <<= 2;
1349 x += ofs;
1350 x >>= 2;
01c04192 Michael Matz2014-04-06 01:02:42 +02001351#ifdef DEBUG_RELOC
89ad24e7 gus knight2015-07-29 16:53:57 -04001352 printf ("insn=0x%x --> 0x%x (x==0x%x)\n", *ptr,
1353 (*ptr & 0xff000000) | x, x);
01c04192 Michael Matz2014-04-06 01:02:42 +02001354#endif
89ad24e7 gus knight2015-07-29 16:53:57 -04001355 *ptr = (*ptr & 0xff000000) | x;
1356 }
4df5bd2e bellard2003-10-14 22:15:56 +00001357 }
1358 break;
e571850d
TP
Thomas Preud'homme2014-02-02 17:15:19 +08001359 case R_ARM_THM_JUMP24:
1360 sym_index = ELFW(R_SYM)(rel->r_info);
1361 sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
1362 /* We are relocating a jump from thumb code to arm code */
1363 if (sym->st_shndx != SHN_UNDEF && !(sym->st_value & 1)) {
1364 int index;
1365 uint8_t *p;
1366 char *name, buf[1024];
1367 Section *text_section;
1368
62d1da1b Thomas Preud'homme2014-03-09 22:52:31 +08001369 name = (char *) symtab_section->link->data + sym->st_name;
e571850d
TP
Thomas Preud'homme2014-02-02 17:15:19 +08001370 text_section = s1->sections[sym->st_shndx];
1371 /* Modify reloc to target a thumb stub to switch to ARM */
1372 snprintf(buf, sizeof(buf), "%s_from_thumb", name);
1373 index = put_elf_sym(symtab_section,
1374 text_section->data_offset + 1,
1375 sym->st_size, sym->st_info, 0,
1376 sym->st_shndx, buf);
1377 rel->r_info = ELFW(R_INFO)(index, type);
1378 /* Create a thumb stub fonction to switch to ARM mode */
1379 put_elf_reloc(symtab_section, text_section,
b2192fc5 Thomas Preud'homme2014-03-11 21:45:52 +08001380 text_section->data_offset + 4, R_ARM_JUMP24,
e571850d
TP
Thomas Preud'homme2014-02-02 17:15:19 +08001381 sym_index);
1382 p = section_ptr_add(text_section, 8);
1383 put32(p, 0x4778); /* bx pc */
1384 put32(p+2, 0x46c0); /* nop */
1385 put32(p+4, 0xeafffffe); /* b $sym */
1386 }
b14ef0e2
EGE
Edmund Grimley Evans2015-02-13 18:58:31 +00001387#elif defined(TCC_TARGET_ARM64)
1388 //xx Other cases may be required here:
1389 case R_AARCH64_ADR_GOT_PAGE:
1390 case R_AARCH64_LD64_GOT_LO12_NC:
1391 if (!s1->got)
1392 build_got(s1);
1393 sym_index = ELFW(R_SYM)(rel->r_info);
1394 sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
1395 reloc_type = R_AARCH64_GLOB_DAT;
1396 put_got_entry(s1, reloc_type, sym->st_size, sym->st_info,
1397 sym_index);
1398 break;
6d055312 Michael Matz2015-02-22 05:59:06 +01001399
89ad24e7 gus knight2015-07-29 16:53:57 -04001400 case R_AARCH64_JUMP26:
1401 case R_AARCH64_CALL26:
6d055312
MM
Michael Matz2015-02-22 05:59:06 +01001402 if (!s1->got)
1403 build_got(s1);
1404 sym_index = ELFW(R_SYM)(rel->r_info);
1405 sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
1406 if (sym->st_shndx == SHN_UNDEF) {
89ad24e7 gus knight2015-07-29 16:53:57 -04001407 unsigned long ofs;
1408 reloc_type = R_AARCH64_JUMP_SLOT;
6d055312 Michael Matz2015-02-22 05:59:06 +01001409 ofs = put_got_entry(s1, reloc_type, sym->st_size,
89ad24e7 gus knight2015-07-29 16:53:57 -04001410 sym->st_info, sym_index);
1411 /* We store the place of the generated PLT slot
1412 in our addend. */
1413 rel->r_addend += ofs;
6d055312 Michael Matz2015-02-22 05:59:06 +01001414 }
89ad24e7 gus knight2015-07-29 16:53:57 -04001415 break;
79c72b24 bellard2004-10-04 21:57:35 +00001416#elif defined(TCC_TARGET_C67)
5342b32e grischka2007-12-19 17:36:42 +00001417 case R_C60_GOT32:
79c72b24 bellard2004-10-04 21:57:35 +00001418 case R_C60_GOTOFF:
1419 case R_C60_GOTPC:
1420 case R_C60_PLT32:
1421 if (!s1->got)
1422 build_got(s1);
1423 if (type == R_C60_GOT32 || type == R_C60_PLT32) {
7dd792ef
SH
Shinichiro Hamaji2008-11-30 08:14:07 +09001424 sym_index = ELFW(R_SYM)(rel->r_info);
1425 sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
79c72b24 bellard2004-10-04 21:57:35 +00001426 /* look at the symbol got offset. If none, then add one */
1427 if (type == R_C60_GOT32)
1428 reloc_type = R_C60_GLOB_DAT;
1429 else
1430 reloc_type = R_C60_JMP_SLOT;
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001431 put_got_entry(s1, reloc_type, sym->st_size, sym->st_info,
79c72b24 bellard2004-10-04 21:57:35 +00001432 sym_index);
1433 }
1434 break;
0a9873aa
SH
Shinichiro Hamaji2008-12-02 03:19:25 +09001435#elif defined(TCC_TARGET_X86_64)
1436 case R_X86_64_GOT32:
1437 case R_X86_64_GOTTPOFF:
1438 case R_X86_64_GOTPCREL:
1439 case R_X86_64_PLT32:
e69c5066
MM
Michael Matz2014-04-14 04:58:05 +02001440 sym_index = ELFW(R_SYM)(rel->r_info);
1441 sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
89ad24e7 gus knight2015-07-29 16:53:57 -04001442 if (type == R_X86_64_PLT32 &&
1443 ELFW(ST_VISIBILITY)(sym->st_other) != STV_DEFAULT)
1444 {
1445 rel->r_info = ELFW(R_INFO)(sym_index, R_X86_64_PC32);
1446 break;
1447 }
e69c5066 Michael Matz2014-04-14 04:58:05 +02001448
0a9873aa
SH
Shinichiro Hamaji2008-12-02 03:19:25 +09001449 if (!s1->got)
1450 build_got(s1);
97072b3c
SH
Shinichiro Hamaji2009-04-05 02:07:19 +09001451 if (type == R_X86_64_GOT32 || type == R_X86_64_GOTPCREL ||
1452 type == R_X86_64_PLT32) {
89ad24e7 gus knight2015-07-29 16:53:57 -04001453 unsigned long ofs;
0a9873aa Shinichiro Hamaji2008-12-02 03:19:25 +09001454 /* look at the symbol got offset. If none, then add one */
97072b3c Shinichiro Hamaji2009-04-05 02:07:19 +09001455 if (type == R_X86_64_GOT32 || type == R_X86_64_GOTPCREL)
0a9873aa
SH
Shinichiro Hamaji2008-12-02 03:19:25 +09001456 reloc_type = R_X86_64_GLOB_DAT;
1457 else
89ad24e7 gus knight2015-07-29 16:53:57 -04001458 reloc_type = R_X86_64_JUMP_SLOT;
0bd12820 Michael Matz2014-03-31 05:36:12 +02001459 ofs = put_got_entry(s1, reloc_type, sym->st_size,
89ad24e7 gus knight2015-07-29 16:53:57 -04001460 sym->st_info, sym_index);
1461 if (type == R_X86_64_PLT32)
1462 /* We store the place of the generated PLT slot
1463 in our addend. */
1464 rel->r_addend += ofs;
0a9873aa
SH
Shinichiro Hamaji2008-12-02 03:19:25 +09001465 }
1466 break;
4df5bd2e bellard2003-10-14 22:15:56 +00001467#else
1468#error unsupported CPU
1469#endif
3a58c53e bellard2002-08-18 13:17:59 +00001470 default:
1471 break;
1472 }
1473 }
1474 }
1475}
1476
88a3ccab grischka2009-12-20 01:53:49 +01001477ST_FUNC Section *new_symtab(TCCState *s1,
e4c7dd5e bellard2002-11-02 14:13:21 +00001478 const char *symtab_name, int sh_type, int sh_flags,
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001479 const char *strtab_name,
3a58c53e bellard2002-08-18 13:17:59 +00001480 const char *hash_name, int hash_sh_flags)
1481{
1482 Section *symtab, *strtab, *hash;
1483 int *ptr, nb_buckets;
1484
e4c7dd5e bellard2002-11-02 14:13:21 +00001485 symtab = new_section(s1, symtab_name, sh_type, sh_flags);
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09001486 symtab->sh_entsize = sizeof(ElfW(Sym));
e4c7dd5e bellard2002-11-02 14:13:21 +00001487 strtab = new_section(s1, strtab_name, SHT_STRTAB, sh_flags);
3a58c53e bellard2002-08-18 13:17:59 +00001488 put_elf_str(strtab, "");
1489 symtab->link = strtab;
1490 put_elf_sym(symtab, 0, 0, 0, 0, 0, NULL);
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001491
3a58c53e bellard2002-08-18 13:17:59 +00001492 nb_buckets = 1;
1493
e4c7dd5e bellard2002-11-02 14:13:21 +00001494 hash = new_section(s1, hash_name, SHT_HASH, hash_sh_flags);
3a58c53e bellard2002-08-18 13:17:59 +00001495 hash->sh_entsize = sizeof(int);
1496 symtab->hash = hash;
1497 hash->link = symtab;
1498
1499 ptr = section_ptr_add(hash, (2 + nb_buckets + 1) * sizeof(int));
1500 ptr[0] = nb_buckets;
1501 ptr[1] = 1;
1502 memset(ptr + 2, 0, (nb_buckets + 1) * sizeof(int));
1503 return symtab;
1504}
1505
1506/* put dynamic tag */
82bcbd02 grischka2013-02-04 16:08:06 +01001507static void put_dt(Section *dynamic, int dt, addr_t val)
3a58c53e bellard2002-08-18 13:17:59 +00001508{
7dd792ef
SH
Shinichiro Hamaji2008-11-30 08:14:07 +09001509 ElfW(Dyn) *dyn;
1510 dyn = section_ptr_add(dynamic, sizeof(ElfW(Dyn)));
3a58c53e bellard2002-08-18 13:17:59 +00001511 dyn->d_tag = dt;
1512 dyn->d_un.d_val = val;
1513}
1514
9d95be78 bellard2003-05-29 22:52:53 +00001515static void add_init_array_defines(TCCState *s1, const char *section_name)
1516{
1517 Section *s;
1518 long end_offset;
1519 char sym_start[1024];
1520 char sym_end[1024];
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001521
9d95be78 bellard2003-05-29 22:52:53 +00001522 snprintf(sym_start, sizeof(sym_start), "__%s_start", section_name + 1);
1523 snprintf(sym_end, sizeof(sym_end), "__%s_end", section_name + 1);
1524
1525 s = find_section(s1, section_name);
1526 if (!s) {
1527 end_offset = 0;
1528 s = data_section;
1529 } else {
1530 end_offset = s->data_offset;
1531 }
1532
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001533 add_elf_sym(symtab_section,
9d95be78 bellard2003-05-29 22:52:53 +00001534 0, 0,
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09001535 ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
9d95be78 bellard2003-05-29 22:52:53 +00001536 s->sh_num, sym_start);
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001537 add_elf_sym(symtab_section,
9d95be78 bellard2003-05-29 22:52:53 +00001538 end_offset, 0,
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09001539 ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
9d95be78 bellard2003-05-29 22:52:53 +00001540 s->sh_num, sym_end);
1541}
1542
548a55ed seyko2015-03-26 06:22:37 +03001543static int tcc_add_support(TCCState *s1, const char *filename)
1544{
1545 char buf[1024];
1546 snprintf(buf, sizeof(buf), "%s/%s/%s", s1->tcc_lib_path,
1547 /* an cpu specific path inside tcc_lib_path, mainly for keeping libtcc1.a */
1548 #ifdef TCC_TARGET_I386
89ad24e7 gus knight2015-07-29 16:53:57 -04001549 "i386"
548a55ed seyko2015-03-26 06:22:37 +03001550 #endif
1551 #ifdef TCC_TARGET_X86_64
89ad24e7 gus knight2015-07-29 16:53:57 -04001552 "x86-64"
548a55ed seyko2015-03-26 06:22:37 +03001553 #endif
1554 #ifdef TCC_TARGET_ARM
89ad24e7 gus knight2015-07-29 16:53:57 -04001555 "arm"
548a55ed seyko2015-03-26 06:22:37 +03001556 #endif
1557 #ifdef TCC_TARGET_ARM64
89ad24e7 gus knight2015-07-29 16:53:57 -04001558 "arm64"
548a55ed seyko2015-03-26 06:22:37 +03001559 #endif
1560 #ifdef TCC_TARGET_C67
89ad24e7 gus knight2015-07-29 16:53:57 -04001561 "C67"
548a55ed seyko2015-03-26 06:22:37 +03001562 #endif
89ad24e7 gus knight2015-07-29 16:53:57 -04001563 ,filename);
548a55ed seyko2015-03-26 06:22:37 +03001564
05364072 seyko2015-04-12 15:35:37 +03001565 return tcc_add_file(s1, buf, TCC_FILETYPE_BINARY);
548a55ed seyko2015-03-26 06:22:37 +03001566}
1567
88a3ccab grischka2009-12-20 01:53:49 +01001568ST_FUNC void tcc_add_bcheck(TCCState *s1)
3a58c53e bellard2002-08-18 13:17:59 +00001569{
7fa712e0 grischka2009-12-19 22:22:43 +01001570#ifdef CONFIG_TCC_BCHECK
acef4ff2 seyko2015-03-26 07:47:45 +03001571 addr_t *ptr;
7fa712e0 grischka2009-12-19 22:22:43 +01001572
1573 if (0 == s1->do_bounds_check)
1574 return;
1575
1576 /* XXX: add an object file to do that */
d80593bc seyko2015-03-29 11:28:02 +03001577 ptr = section_ptr_add(bounds_section, sizeof(*ptr));
7fa712e0 grischka2009-12-19 22:22:43 +01001578 *ptr = 0;
1579 add_elf_sym(symtab_section, 0, 0,
1580 ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
1581 bounds_section->sh_num, "__bounds_start");
7fa712e0 grischka2009-12-19 22:22:43 +01001582 if (s1->output_type != TCC_OUTPUT_MEMORY) {
1583 /* add 'call __bound_init()' in .init section */
7e7e6148 seyko2015-04-10 07:37:31 +03001584
1585 /* XXX not called on MSYS, reason is unknown. For this
1586 case a call to __bound_init is performed in bcheck.c
1587 when __bound_ptr_add, __bound_new_region,
1588 __bound_delete_region called */
1589
89ad24e7 gus knight2015-07-29 16:53:57 -04001590 int sym_index = find_elf_sym(symtab_section, "__bound_init");
1591 if (sym_index) {
1592 Section *init_section = find_section(s1, ".init");
1593 unsigned char *pinit = section_ptr_add(init_section, 5);
1594 pinit[0] = 0xe8;
1595 put32(pinit + 1, -4);
1596 put_elf_reloc(symtab_section, init_section,
1597 init_section->data_offset - 4, R_386_PC32, sym_index);
1598 }
1599 else
1600 tcc_warning("__bound_init not defined");
3a58c53e bellard2002-08-18 13:17:59 +00001601 }
1602#endif
7fa712e0 grischka2009-12-19 22:22:43 +01001603}
1604
1605/* add tcc runtime libraries */
88a3ccab grischka2009-12-20 01:53:49 +01001606ST_FUNC void tcc_add_runtime(TCCState *s1)
7fa712e0 grischka2009-12-19 22:22:43 +01001607{
30df3189 grischka2015-05-09 14:29:39 +02001608 tcc_add_pragma_libs(s1);
1609
feed3262 bellard2003-10-04 21:24:46 +00001610 /* add libc */
1611 if (!s1->nostdlib) {
7fa712e0 grischka2009-12-19 22:22:43 +01001612 tcc_add_library(s1, "c");
81cd0cf6 grischka2011-08-06 16:11:12 +02001613#ifdef CONFIG_USE_LIBGCC
078ba241 Thomas Preud'homme2014-03-25 21:18:57 +08001614 if (!s1->static_link) {
05364072 seyko2015-04-12 15:35:37 +03001615 tcc_add_file(s1, TCC_LIBGCC, TCC_FILETYPE_BINARY);
6cbf4fb7 seyko2015-03-03 17:11:18 +03001616 }
15e0dc08 Daniel Glöckner2008-09-05 21:08:37 +02001617#endif
6cbf4fb7 seyko2015-03-03 17:11:18 +03001618 tcc_add_support(s1, "libtcc1.a");
ec1c8308
TP
Thomas Preud'homme2014-03-17 23:14:38 +08001619 }
1620
1621 /* tcc_add_bcheck tries to relocate a call to __bound_init in _init so
1622 libtcc1.a must be loaded before for __bound_init to be defined and
1623 crtn.o must be loaded after to not finalize _init too early. */
1624 tcc_add_bcheck(s1);
1625
1626 if (!s1->nostdlib) {
81cd0cf6 grischka2011-08-06 16:11:12 +02001627 /* add crt end if not memory output */
1628 if (s1->output_type != TCC_OUTPUT_MEMORY)
e844fb11 grischka2011-08-06 16:49:30 +02001629 tcc_add_crt(s1, "crtn.o");
3a58c53e bellard2002-08-18 13:17:59 +00001630 }
38e8a230 bellard2004-10-23 22:53:42 +00001631}
1632
1633/* add various standard linker symbols (must be done after the
1634 sections are filled (for example after allocating common
1635 symbols)) */
88a3ccab grischka2009-12-20 01:53:49 +01001636ST_FUNC void tcc_add_linker_symbols(TCCState *s1)
38e8a230 bellard2004-10-23 22:53:42 +00001637{
1638 char buf[1024];
1639 int i;
1640 Section *s;
1641
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001642 add_elf_sym(symtab_section,
3a58c53e bellard2002-08-18 13:17:59 +00001643 text_section->data_offset, 0,
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09001644 ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
3a58c53e bellard2002-08-18 13:17:59 +00001645 text_section->sh_num, "_etext");
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001646 add_elf_sym(symtab_section,
3a58c53e bellard2002-08-18 13:17:59 +00001647 data_section->data_offset, 0,
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09001648 ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
3a58c53e bellard2002-08-18 13:17:59 +00001649 data_section->sh_num, "_edata");
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001650 add_elf_sym(symtab_section,
3a58c53e bellard2002-08-18 13:17:59 +00001651 bss_section->data_offset, 0,
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09001652 ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
3a58c53e bellard2002-08-18 13:17:59 +00001653 bss_section->sh_num, "_end");
9d95be78 bellard2003-05-29 22:52:53 +00001654 /* horrible new standard ldscript defines */
1655 add_init_array_defines(s1, ".preinit_array");
1656 add_init_array_defines(s1, ".init_array");
1657 add_init_array_defines(s1, ".fini_array");
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001658
3a58c53e bellard2002-08-18 13:17:59 +00001659 /* add start and stop symbols for sections whose name can be
1660 expressed in C */
e4c7dd5e bellard2002-11-02 14:13:21 +00001661 for(i = 1; i < s1->nb_sections; i++) {
1662 s = s1->sections[i];
3a58c53e bellard2002-08-18 13:17:59 +00001663 if (s->sh_type == SHT_PROGBITS &&
1664 (s->sh_flags & SHF_ALLOC)) {
1665 const char *p;
1666 int ch;
1667
1668 /* check if section name can be expressed in C */
1669 p = s->name;
1670 for(;;) {
1671 ch = *p;
1672 if (!ch)
1673 break;
1674 if (!isid(ch) && !isnum(ch))
1675 goto next_sec;
1676 p++;
1677 }
1678 snprintf(buf, sizeof(buf), "__start_%s", s->name);
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001679 add_elf_sym(symtab_section,
3a58c53e bellard2002-08-18 13:17:59 +00001680 0, 0,
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09001681 ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
3a58c53e bellard2002-08-18 13:17:59 +00001682 s->sh_num, buf);
1683 snprintf(buf, sizeof(buf), "__stop_%s", s->name);
1684 add_elf_sym(symtab_section,
1685 s->data_offset, 0,
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09001686 ELFW(ST_INFO)(STB_GLOBAL, STT_NOTYPE), 0,
3a58c53e bellard2002-08-18 13:17:59 +00001687 s->sh_num, buf);
1688 }
1689 next_sec: ;
1690 }
1691}
1692
38e8a230 bellard2004-10-23 22:53:42 +00001693static void tcc_output_binary(TCCState *s1, FILE *f,
4aec2902 Thomas Preud'homme2013-12-18 11:17:17 +08001694 const int *sec_order)
38e8a230 bellard2004-10-23 22:53:42 +00001695{
1696 Section *s;
1697 int i, offset, size;
1698
1699 offset = 0;
1700 for(i=1;i<s1->nb_sections;i++) {
4aec2902 Thomas Preud'homme2013-12-18 11:17:17 +08001701 s = s1->sections[sec_order[i]];
38e8a230 bellard2004-10-23 22:53:42 +00001702 if (s->sh_type != SHT_NOBITS &&
1703 (s->sh_flags & SHF_ALLOC)) {
1704 while (offset < s->sh_offset) {
1705 fputc(0, f);
1706 offset++;
1707 }
1708 size = s->sh_size;
1709 fwrite(s->data, 1, size, f);
1710 offset += size;
1711 }
1712 }
1713}
1714
5c233f2c mingodad2014-03-28 21:07:06 +00001715#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
3d4b57ff
TP
Thomas Preud'homme2013-12-17 20:59:14 +08001716#define HAVE_PHDR 1
1717#define EXTRA_RELITEMS 14
55cb2170
LR
Luigi Rizzo2009-11-29 03:25:29 +01001718
1719/* move the relocation value from .dynsym to .got */
1720void patch_dynsym_undef(TCCState *s1, Section *s)
1721{
1722 uint32_t *gotd = (void *)s1->got->data;
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +08001723 ElfW(Sym) *sym;
55cb2170 Luigi Rizzo2009-11-29 03:25:29 +01001724
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001725 gotd += 3; /* dummy entries in .got */
55cb2170 Luigi Rizzo2009-11-29 03:25:29 +01001726 /* relocate symbols in .dynsym */
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +08001727 for_each_elem(s, 1, sym, ElfW(Sym)) {
3d4b57ff
TP
Thomas Preud'homme2013-12-17 20:59:14 +08001728 if (sym->st_shndx == SHN_UNDEF) {
1729 *gotd++ = sym->st_value + 6; /* XXX 6 is magic ? */
1730 sym->st_value = 0;
1731 }
55cb2170
LR
Luigi Rizzo2009-11-29 03:25:29 +01001732 }
1733}
1734#else
f2c8491f Michael Matz2014-04-03 18:00:44 +02001735#define HAVE_PHDR 1
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001736#define EXTRA_RELITEMS 9
ab7ed48e
DG
Daniel Glöckner2010-06-23 00:20:32 +02001737
1738/* zero plt offsets of weak symbols in .dynsym */
1739void patch_dynsym_undef(TCCState *s1, Section *s)
1740{
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +08001741 ElfW(Sym) *sym;
ab7ed48e Daniel Glöckner2010-06-23 00:20:32 +02001742
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +08001743 for_each_elem(s, 1, sym, ElfW(Sym))
ab7ed48e
DG
Daniel Glöckner2010-06-23 00:20:32 +02001744 if (sym->st_shndx == SHN_UNDEF && ELFW(ST_BIND)(sym->st_info) == STB_WEAK)
1745 sym->st_value = 0;
1746}
55cb2170
LR
Luigi Rizzo2009-11-29 03:25:29 +01001747#endif
1748
d63ec6f2
AGR
Ali Gholami Rudi2010-02-04 23:08:01 +03301749ST_FUNC void fill_got_entry(TCCState *s1, ElfW_Rel *rel)
1750{
3d4b57ff
TP
Thomas Preud'homme2013-12-17 20:59:14 +08001751 int sym_index = ELFW(R_SYM) (rel->r_info);
1752 ElfW(Sym) *sym = &((ElfW(Sym) *) symtab_section->data)[sym_index];
1753 unsigned long offset;
1754
1755 if (sym_index >= s1->nb_sym_attrs)
1756 return;
1757 offset = s1->sym_attrs[sym_index].got_offset;
1758 section_reserve(s1->got, offset + PTR_SIZE);
d2cf970a grischka2010-04-13 18:30:01 +02001759#ifdef TCC_TARGET_X86_64
3d4b57ff
TP
Thomas Preud'homme2013-12-17 20:59:14 +08001760 /* only works for x86-64 */
1761 put32(s1->got->data + offset + 4, sym->st_value >> 32);
d2cf970a grischka2010-04-13 18:30:01 +02001762#endif
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001763 put32(s1->got->data + offset, sym->st_value & 0xffffffff);
d63ec6f2
AGR
Ali Gholami Rudi2010-02-04 23:08:01 +03301764}
1765
6e0a658e grischka2014-05-08 17:32:29 +02001766/* Perform relocation to GOT or PLT entries */
d63ec6f2
AGR
Ali Gholami Rudi2010-02-04 23:08:01 +03301767ST_FUNC void fill_got(TCCState *s1)
1768{
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001769 Section *s;
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +08001770 ElfW_Rel *rel;
3d4b57ff
TP
Thomas Preud'homme2013-12-17 20:59:14 +08001771 int i;
1772
1773 for(i = 1; i < s1->nb_sections; i++) {
1774 s = s1->sections[i];
1775 if (s->sh_type != SHT_RELX)
1776 continue;
1777 /* no need to handle got relocations */
1778 if (s->link != symtab_section)
1779 continue;
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +08001780 for_each_elem(s, 0, rel, ElfW_Rel) {
3d4b57ff
TP
Thomas Preud'homme2013-12-17 20:59:14 +08001781 switch (ELFW(R_TYPE) (rel->r_info)) {
1782 case R_X86_64_GOT32:
1783 case R_X86_64_GOTPCREL:
1784 case R_X86_64_PLT32:
1785 fill_got_entry(s1, rel);
1786 break;
1787 }
1788 }
1789 }
d63ec6f2
AGR
Ali Gholami Rudi2010-02-04 23:08:01 +03301790}
1791
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001792/* Bind symbols of executable: resolve undefined symbols from exported symbols
1793 in shared libraries and export non local defined symbols to shared libraries
1794 if -rdynamic switch was given on command line */
1795static void bind_exe_dynsyms(TCCState *s1)
3a58c53e bellard2002-08-18 13:17:59 +00001796{
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001797 const char *name;
1798 int sym_index, index;
1799 ElfW(Sym) *sym, *esym;
1800 int type;
e5a706a0 Thomas Preud'homme2014-02-02 20:02:11 +08001801
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001802 /* Resolve undefined symbols from dynamic symbols. When there is a match:
1803 - if STT_FUNC or STT_GNU_IFUNC symbol -> add it in PLT
1804 - if STT_OBJECT symbol -> add it in .bss section with suitable reloc */
1805 for_each_elem(symtab_section, 1, sym, ElfW(Sym)) {
1806 if (sym->st_shndx == SHN_UNDEF) {
62d1da1b Thomas Preud'homme2014-03-09 22:52:31 +08001807 name = (char *) symtab_section->link->data + sym->st_name;
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001808 sym_index = find_elf_sym(s1->dynsymtab_section, name);
1809 if (sym_index) {
1810 esym = &((ElfW(Sym) *)s1->dynsymtab_section->data)[sym_index];
1811 type = ELFW(ST_TYPE)(esym->st_info);
1812 if ((type == STT_FUNC) || (type == STT_GNU_IFUNC)) {
1813 /* Indirect functions shall have STT_FUNC type in executable
1814 * dynsym section. Indeed, a dlsym call following a lazy
1815 * resolution would pick the symbol value from the
1816 * executable dynsym entry which would contain the address
1817 * of the function wanted by the caller of dlsym instead of
1818 * the address of the function that would return that
1819 * address */
1820 put_got_entry(s1, R_JMP_SLOT, esym->st_size,
1821 ELFW(ST_INFO)(STB_GLOBAL,STT_FUNC),
1822 sym - (ElfW(Sym) *)symtab_section->data);
1823 } else if (type == STT_OBJECT) {
1824 unsigned long offset;
1825 ElfW(Sym) *dynsym;
1826 offset = bss_section->data_offset;
1827 /* XXX: which alignment ? */
1828 offset = (offset + 16 - 1) & -16;
1829 index = put_elf_sym(s1->dynsym, offset, esym->st_size,
1830 esym->st_info, 0, bss_section->sh_num,
1831 name);
1832 /* Ensure R_COPY works for weak symbol aliases */
1833 if (ELFW(ST_BIND)(esym->st_info) == STB_WEAK) {
1834 for_each_elem(s1->dynsymtab_section, 1, dynsym, ElfW(Sym)) {
1835 if ((dynsym->st_value == esym->st_value)
1836 && (ELFW(ST_BIND)(dynsym->st_info) == STB_GLOBAL)) {
62d1da1b Thomas Preud'homme2014-03-09 22:52:31 +08001837 char *dynname = (char *) s1->dynsymtab_section->link->data
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001838 + dynsym->st_name;
1839 put_elf_sym(s1->dynsym, offset, dynsym->st_size,
1840 dynsym->st_info, 0,
1841 bss_section->sh_num, dynname);
1842 break;
3a58c53e bellard2002-08-18 13:17:59 +00001843 }
1844 }
1845 }
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001846 put_elf_reloc(s1->dynsym, bss_section,
1847 offset, R_COPY, index);
1848 offset += esym->st_size;
1849 bss_section->data_offset = offset;
3a58c53e bellard2002-08-18 13:17:59 +00001850 }
1851 } else {
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001852 /* STB_WEAK undefined symbols are accepted */
1853 /* XXX: _fp_hw seems to be part of the ABI, so we ignore it */
1854 if (ELFW(ST_BIND)(sym->st_info) == STB_WEAK ||
1855 !strcmp(name, "_fp_hw")) {
1856 } else {
1857 tcc_error_noabort("undefined symbol '%s'", name);
3a58c53e bellard2002-08-18 13:17:59 +00001858 }
1859 }
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001860 } else if (s1->rdynamic && ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) {
1861 /* if -rdynamic option, then export all non local symbols */
62d1da1b Thomas Preud'homme2014-03-09 22:52:31 +08001862 name = (char *) symtab_section->link->data + sym->st_name;
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001863 put_elf_sym(s1->dynsym, sym->st_value, sym->st_size, sym->st_info,
1864 0, sym->st_shndx, name);
1865 }
1866 }
1867}
3a58c53e bellard2002-08-18 13:17:59 +00001868
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001869/* Bind symbols of libraries: export non local symbols of executable that
1870 resolve undefined symbols of shared libraries */
1871static void bind_libs_dynsyms(TCCState *s1)
1872{
1873 const char *name;
1874 int sym_index;
1875 ElfW(Sym) *sym, *esym;
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08001876
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001877 /* now look at unresolved dynamic symbols and export
1878 corresponding symbol */
1879 for_each_elem(s1->dynsymtab_section, 1, esym, ElfW(Sym)) {
9336fa7a
TP
Thomas Preud'homme2015-04-18 15:28:02 +08001880 name = (char *) s1->dynsymtab_section->link->data + esym->st_name;
1881 sym_index = find_elf_sym(symtab_section, name);
1882 if (sym_index) {
1883 /* XXX: avoid adding a symbol if already present because of
1884 -rdynamic ? */
1885 sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
1886 if (sym->st_shndx != SHN_UNDEF)
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001887 put_elf_sym(s1->dynsym, sym->st_value, sym->st_size,
1888 sym->st_info, 0, sym->st_shndx, name);
9336fa7a
TP
Thomas Preud'homme2015-04-18 15:28:02 +08001889 } else if (esym->st_shndx == SHN_UNDEF) {
1890 /* weak symbols can stay undefined */
1891 if (ELFW(ST_BIND)(esym->st_info) != STB_WEAK)
1892 tcc_warning("undefined dynamic symbol '%s'", name);
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001893 }
1894 }
1895}
e81569bc grischka2009-12-19 22:08:15 +01001896
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001897/* Export all non local symbols (for shared libraries) */
1898static void export_global_syms(TCCState *s1)
1899{
1900 int nb_syms, dynindex, index;
1901 const char *name;
1902 ElfW(Sym) *sym;
e81569bc grischka2009-12-19 22:08:15 +01001903
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001904 nb_syms = symtab_section->data_offset / sizeof(ElfW(Sym));
1905 s1->symtab_to_dynsym = tcc_mallocz(sizeof(int) * nb_syms);
1906 for_each_elem(symtab_section, 1, sym, ElfW(Sym)) {
1907 if (ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) {
89ad24e7 gus knight2015-07-29 16:53:57 -04001908 name = (char *) symtab_section->link->data + sym->st_name;
1909 dynindex = put_elf_sym(s1->dynsym, sym->st_value, sym->st_size,
1910 sym->st_info, 0, sym->st_shndx, name);
1911 index = sym - (ElfW(Sym) *) symtab_section->data;
1912 s1->symtab_to_dynsym[index] = dynindex;
b5b82df3 Thomas Preud'homme2013-12-18 11:17:17 +08001913 }
b5b82df3 Thomas Preud'homme2013-12-18 11:17:17 +08001914 }
4aec2902 Thomas Preud'homme2013-12-18 11:17:17 +08001915}
3a58c53e bellard2002-08-18 13:17:59 +00001916
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001917/* relocate the PLT: compute addresses and offsets in the PLT now that final
1918 address for PLT and GOT are known (see fill_program_header) */
9750d0b7 Michael Matz2014-04-06 00:30:22 +02001919ST_FUNC void relocate_plt(TCCState *s1)
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001920{
1921 uint8_t *p, *p_end;
e5a706a0 Thomas Preud'homme2014-02-02 20:02:11 +08001922
9750d0b7
MM
Michael Matz2014-04-06 00:30:22 +02001923 if (!s1->plt)
1924 return;
1925
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001926 p = s1->plt->data;
1927 p_end = p + s1->plt->data_offset;
1928 if (p < p_end) {
1929#if defined(TCC_TARGET_I386)
1930 put32(p + 2, get32(p + 2) + s1->got->sh_addr);
1931 put32(p + 8, get32(p + 8) + s1->got->sh_addr);
1932 p += 16;
1933 while (p < p_end) {
1934 put32(p + 2, get32(p + 2) + s1->got->sh_addr);
1935 p += 16;
1936 }
1937#elif defined(TCC_TARGET_X86_64)
1938 int x = s1->got->sh_addr - s1->plt->sh_addr - 6;
1939 put32(p + 2, get32(p + 2) + x);
1940 put32(p + 8, get32(p + 8) + x - 6);
1941 p += 16;
1942 while (p < p_end) {
1943 put32(p + 2, get32(p + 2) + x + s1->plt->data - p);
1944 p += 16;
1945 }
1946#elif defined(TCC_TARGET_ARM)
1947 int x;
1948 x=s1->got->sh_addr - s1->plt->sh_addr - 12;
1949 p += 16;
1950 while (p < p_end) {
1951 if (get32(p) == 0x46c04778) /* PLT Thumb stub present */
1952 p += 4;
1953 put32(p + 12, x + get32(p + 12) + s1->plt->data - p);
1954 p += 16;
1955 }
b14ef0e2
EGE
Edmund Grimley Evans2015-02-13 18:58:31 +00001956#elif defined(TCC_TARGET_ARM64)
1957 uint64_t plt = s1->plt->sh_addr;
1958 uint64_t got = s1->got->sh_addr;
1959 uint64_t off = (got >> 12) - (plt >> 12);
6d055312
MM
Michael Matz2015-02-22 05:59:06 +01001960 if ((off + ((uint32_t)1 << 20)) >> 21)
1961 tcc_error("Failed relocating PLT (off=0x%lx, got=0x%lx, plt=0x%lx)", off, got, plt);
b14ef0e2
EGE
Edmund Grimley Evans2015-02-13 18:58:31 +00001962 put32(p, 0xa9bf7bf0); // stp x16,x30,[sp,#-16]!
1963 put32(p + 4, (0x90000010 | // adrp x16,...
1964 (off & 0x1ffffc) << 3 | (off & 3) << 29));
1965 put32(p + 8, (0xf9400211 | // ldr x17,[x16,#...]
1966 (got & 0xff8) << 7));
1967 put32(p + 12, (0x91000210 | // add x16,x16,#...
1968 (got & 0xfff) << 10));
1969 put32(p + 16, 0xd61f0220); // br x17
1970 put32(p + 20, 0xd503201f); // nop
1971 put32(p + 24, 0xd503201f); // nop
1972 put32(p + 28, 0xd503201f); // nop
1973 p += 32;
1974 while (p < p_end) {
1975 uint64_t pc = plt + (p - s1->plt->data);
1976 uint64_t addr = got +
1977 (get32(p) | (uint64_t)get32(p + 4) << 32);
1978 uint32_t off = (addr >> 12) - (pc >> 12);
6d055312
MM
Michael Matz2015-02-22 05:59:06 +01001979 if ((off + ((uint32_t)1 << 20)) >> 21)
1980 tcc_error("Failed relocating PLT (off=0x%lx, addr=0x%lx, pc=0x%lx)", off, addr, pc);
b14ef0e2
EGE
Edmund Grimley Evans2015-02-13 18:58:31 +00001981 put32(p, (0x90000010 | // adrp x16,...
1982 (off & 0x1ffffc) << 3 | (off & 3) << 29));
1983 put32(p + 4, (0xf9400211 | // ldr x17,[x16,#...]
1984 (addr & 0xff8) << 7));
1985 put32(p + 8, (0x91000210 | // add x16,x16,#...
1986 (addr & 0xfff) << 10));
1987 put32(p + 12, 0xd61f0220); // br x17
1988 p += 16;
1989 }
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001990#elif defined(TCC_TARGET_C67)
1991 /* XXX: TODO */
1992#else
1993#error unsupported CPU
1994#endif
1995 }
1996}
e5a706a0 Thomas Preud'homme2014-02-02 20:02:11 +08001997
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08001998/* Allocate strings for section names and decide if an unallocated section
1999 should be output.
e5a706a0 Thomas Preud'homme2014-02-02 20:02:11 +08002000
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002001 NOTE: the strsec section comes last, so its size is also correct ! */
2002static void alloc_sec_names(TCCState *s1, int file_type, Section *strsec)
2003{
2004 int i;
2005 Section *s;
3a58c53e bellard2002-08-18 13:17:59 +00002006
4aec2902 Thomas Preud'homme2013-12-18 11:17:17 +08002007 /* Allocate strings for section names */
e4c7dd5e bellard2002-11-02 14:13:21 +00002008 for(i = 1; i < s1->nb_sections; i++) {
2009 s = s1->sections[i];
3a58c53e bellard2002-08-18 13:17:59 +00002010 s->sh_name = put_elf_str(strsec, s->name);
2011 /* when generating a DLL, we include relocations but we may
2012 patch them */
3d4b57ff
TP
Thomas Preud'homme2013-12-17 20:59:14 +08002013 if (file_type == TCC_OUTPUT_DLL &&
2014 s->sh_type == SHT_RELX &&
3a58c53e bellard2002-08-18 13:17:59 +00002015 !(s->sh_flags & SHF_ALLOC)) {
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002016 /* gr: avoid bogus relocs for empty (debug) sections */
0d598aca grischka2008-04-27 18:48:19 +00002017 if (s1->sections[s->sh_info]->sh_flags & SHF_ALLOC)
2018 prepare_dynamic_rel(s1, s);
f9181416 grischka2009-05-11 18:45:44 +02002019 else if (s1->do_debug)
0d598aca grischka2008-04-27 18:48:19 +00002020 s->sh_size = s->data_offset;
f9181416 grischka2009-05-11 18:45:44 +02002021 } else if (s1->do_debug ||
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002022 file_type == TCC_OUTPUT_OBJ ||
089ce623 seyko2015-04-10 06:49:24 +03002023 file_type == TCC_OUTPUT_EXE ||
3a58c53e bellard2002-08-18 13:17:59 +00002024 (s->sh_flags & SHF_ALLOC) ||
e4c7dd5e bellard2002-11-02 14:13:21 +00002025 i == (s1->nb_sections - 1)) {
3a58c53e bellard2002-08-18 13:17:59 +00002026 /* we output all sections if debug or object file */
2027 s->sh_size = s->data_offset;
2028 }
2029 }
4aec2902 Thomas Preud'homme2013-12-18 11:17:17 +08002030}
3a58c53e bellard2002-08-18 13:17:59 +00002031
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002032/* Info to be copied in dynamic section */
2033struct dyn_inf {
2034 Section *dynamic;
2035 Section *dynstr;
2036 unsigned long dyn_rel_off;
2037 addr_t rel_addr;
2038 addr_t rel_size;
2039#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2040 addr_t bss_addr;
2041 addr_t bss_size;
2042#endif
2043};
b5b82df3 Thomas Preud'homme2013-12-18 11:17:17 +08002044
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002045/* Assign sections to segments and decide how are sections laid out when loaded
2046 in memory. This function also fills corresponding program headers. */
2047static int layout_sections(TCCState *s1, ElfW(Phdr) *phdr, int phnum,
63376d77
MC
Matteo Cypriani2014-09-07 11:29:38 -04002048 Section *interp, Section* strsec,
2049 struct dyn_inf *dyninf, int *sec_order)
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002050{
2051 int i, j, k, file_type, sh_order_index, file_offset;
6e0a658e grischka2014-05-08 17:32:29 +02002052 unsigned long s_align;
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002053 long long tmp;
2054 addr_t addr;
2055 ElfW(Phdr) *ph;
2056 Section *s;
2057
2058 file_type = s1->output_type;
2059 sh_order_index = 1;
6e0a658e grischka2014-05-08 17:32:29 +02002060 file_offset = 0;
4aec2902 Thomas Preud'homme2013-12-18 11:17:17 +08002061 if (s1->output_format == TCC_OUTPUT_FORMAT_ELF)
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09002062 file_offset = sizeof(ElfW(Ehdr)) + phnum * sizeof(ElfW(Phdr));
6e0a658e grischka2014-05-08 17:32:29 +02002063 s_align = ELF_PAGE_SIZE;
2064 if (s1->section_align)
2065 s_align = s1->section_align;
4aec2902 Thomas Preud'homme2013-12-18 11:17:17 +08002066
3a58c53e bellard2002-08-18 13:17:59 +00002067 if (phnum > 0) {
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002068 if (s1->has_text_addr) {
ff3a5daf bellard2004-10-18 00:20:26 +00002069 int a_offset, p_offset;
2070 addr = s1->text_addr;
2071 /* we ensure that (addr % ELF_PAGE_SIZE) == file_offset %
2072 ELF_PAGE_SIZE */
6e0a658e grischka2014-05-08 17:32:29 +02002073 a_offset = (int) (addr & (s_align - 1));
2074 p_offset = file_offset & (s_align - 1);
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002075 if (a_offset < p_offset)
6e0a658e grischka2014-05-08 17:32:29 +02002076 a_offset += s_align;
ff3a5daf bellard2004-10-18 00:20:26 +00002077 file_offset += (a_offset - p_offset);
2078 } else {
2079 if (file_type == TCC_OUTPUT_DLL)
2080 addr = 0;
2081 else
2082 addr = ELF_START_ADDR;
2083 /* compute address after headers */
6e0a658e grischka2014-05-08 17:32:29 +02002084 addr += (file_offset & (s_align - 1));
ff3a5daf bellard2004-10-18 00:20:26 +00002085 }
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002086
e5a706a0 Thomas Preud'homme2014-02-02 20:02:11 +08002087 ph = &phdr[0];
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002088 /* Leave one program headers for the program interpreter and one for
2089 the program header table itself if needed. These are done later as
2090 they require section layout to be done first. */
e5a706a0
TP
Thomas Preud'homme2014-02-02 20:02:11 +08002091 if (interp)
2092 ph += 1 + HAVE_PHDR;
b5b82df3 Thomas Preud'homme2013-12-18 11:17:17 +08002093
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002094 /* dynamic relocation table information, for .dynamic section */
2095 dyninf->rel_addr = dyninf->rel_size = 0;
2096#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2097 dyninf->bss_addr = dyninf->bss_size = 0;
2098#endif
2099
cf02f920
TP
Thomas Preud'homme2013-11-03 18:55:54 +08002100 for(j = 0; j < 2; j++) {
2101 ph->p_type = PT_LOAD;
1c4afd13 Thomas Preud'homme2013-10-29 22:10:02 +08002102 if (j == 0)
cf02f920
TP
Thomas Preud'homme2013-11-03 18:55:54 +08002103 ph->p_flags = PF_R | PF_X;
2104 else
2105 ph->p_flags = PF_R | PF_W;
6e0a658e grischka2014-05-08 17:32:29 +02002106 ph->p_align = s_align;
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002107
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002108 /* Decide the layout of sections loaded in memory. This must
2109 be done before program headers are filled since they contain
2110 info about the layout. We do the following ordering: interp,
2111 symbol tables, relocations, progbits, nobits */
3a58c53e bellard2002-08-18 13:17:59 +00002112 /* XXX: do faster and simpler sorting */
2113 for(k = 0; k < 5; k++) {
e4c7dd5e bellard2002-11-02 14:13:21 +00002114 for(i = 1; i < s1->nb_sections; i++) {
2115 s = s1->sections[i];
3a58c53e bellard2002-08-18 13:17:59 +00002116 /* compute if section should be included */
2117 if (j == 0) {
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002118 if ((s->sh_flags & (SHF_ALLOC | SHF_WRITE)) !=
3a58c53e bellard2002-08-18 13:17:59 +00002119 SHF_ALLOC)
2120 continue;
1c4afd13 Thomas Preud'homme2013-10-29 22:10:02 +08002121 } else {
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002122 if ((s->sh_flags & (SHF_ALLOC | SHF_WRITE)) !=
cf02f920 Thomas Preud'homme2013-11-03 18:55:54 +08002123 (SHF_ALLOC | SHF_WRITE))
1c4afd13 Thomas Preud'homme2013-10-29 22:10:02 +08002124 continue;
3a58c53e bellard2002-08-18 13:17:59 +00002125 }
2126 if (s == interp) {
2127 if (k != 0)
2128 continue;
2129 } else if (s->sh_type == SHT_DYNSYM ||
2130 s->sh_type == SHT_STRTAB ||
2131 s->sh_type == SHT_HASH) {
2132 if (k != 1)
2133 continue;
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09002134 } else if (s->sh_type == SHT_RELX) {
3a58c53e bellard2002-08-18 13:17:59 +00002135 if (k != 2)
2136 continue;
2137 } else if (s->sh_type == SHT_NOBITS) {
2138 if (k != 4)
2139 continue;
2140 } else {
2141 if (k != 3)
2142 continue;
2143 }
4aec2902 Thomas Preud'homme2013-12-18 11:17:17 +08002144 sec_order[sh_order_index++] = i;
3a58c53e bellard2002-08-18 13:17:59 +00002145
2146 /* section matches: we align it and add its size */
ff3a5daf bellard2004-10-18 00:20:26 +00002147 tmp = addr;
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002148 addr = (addr + s->sh_addralign - 1) &
3a58c53e bellard2002-08-18 13:17:59 +00002149 ~(s->sh_addralign - 1);
a0db7162 Andrew Mulbrook2012-03-03 11:10:15 -06002150 file_offset += (int) ( addr - tmp );
3a58c53e bellard2002-08-18 13:17:59 +00002151 s->sh_offset = file_offset;
3a58c53e bellard2002-08-18 13:17:59 +00002152 s->sh_addr = addr;
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002153
3a58c53e bellard2002-08-18 13:17:59 +00002154 /* update program header infos */
2155 if (ph->p_offset == 0) {
2156 ph->p_offset = file_offset;
2157 ph->p_vaddr = addr;
2158 ph->p_paddr = ph->p_vaddr;
2159 }
2160 /* update dynamic relocation infos */
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09002161 if (s->sh_type == SHT_RELX) {
776364f3 Thomas Preud'homme2010-09-10 21:09:07 +02002162#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002163 if (!strcmp(strsec->data + s->sh_name, ".rel.got")) {
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002164 dyninf->rel_addr = addr;
2165 dyninf->rel_size += s->sh_size; /* XXX only first rel. */
3d4b57ff
TP
Thomas Preud'homme2013-12-17 20:59:14 +08002166 }
2167 if (!strcmp(strsec->data + s->sh_name, ".rel.bss")) {
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002168 dyninf->bss_addr = addr;
2169 dyninf->bss_size = s->sh_size; /* XXX only first rel. */
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002170 }
55cb2170 Luigi Rizzo2009-11-29 03:25:29 +01002171#else
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002172 if (dyninf->rel_size == 0)
2173 dyninf->rel_addr = addr;
2174 dyninf->rel_size += s->sh_size;
55cb2170 Luigi Rizzo2009-11-29 03:25:29 +01002175#endif
3a58c53e bellard2002-08-18 13:17:59 +00002176 }
2177 addr += s->sh_size;
2178 if (s->sh_type != SHT_NOBITS)
2179 file_offset += s->sh_size;
2180 }
2181 }
89ad24e7 gus knight2015-07-29 16:53:57 -04002182 if (j == 0) {
2183 /* Make the first PT_LOAD segment include the program
2184 headers itself (and the ELF header as well), it'll
2185 come out with same memory use but will make various
2186 tools like binutils strip work better. */
2187 ph->p_offset &= ~(ph->p_align - 1);
2188 ph->p_vaddr &= ~(ph->p_align - 1);
2189 ph->p_paddr &= ~(ph->p_align - 1);
2190 }
3a58c53e bellard2002-08-18 13:17:59 +00002191 ph->p_filesz = file_offset - ph->p_offset;
2192 ph->p_memsz = addr - ph->p_vaddr;
2193 ph++;
38e8a230 bellard2004-10-23 22:53:42 +00002194 if (j == 0) {
2195 if (s1->output_format == TCC_OUTPUT_FORMAT_ELF) {
2196 /* if in the middle of a page, we duplicate the page in
2197 memory so that one copy is RX and the other is RW */
6e0a658e grischka2014-05-08 17:32:29 +02002198 if ((addr & (s_align - 1)) != 0)
2199 addr += s_align;
38e8a230 bellard2004-10-23 22:53:42 +00002200 } else {
6e0a658e grischka2014-05-08 17:32:29 +02002201 addr = (addr + s_align - 1) & ~(s_align - 1);
2202 file_offset = (file_offset + s_align - 1) & ~(s_align - 1);
38e8a230 bellard2004-10-23 22:53:42 +00002203 }
2204 }
3a58c53e bellard2002-08-18 13:17:59 +00002205 }
4aec2902 Thomas Preud'homme2013-12-18 11:17:17 +08002206 }
3a58c53e bellard2002-08-18 13:17:59 +00002207
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002208 /* all other sections come after */
2209 for(i = 1; i < s1->nb_sections; i++) {
2210 s = s1->sections[i];
2211 if (phnum > 0 && (s->sh_flags & SHF_ALLOC))
2212 continue;
2213 sec_order[sh_order_index++] = i;
55cb2170 Luigi Rizzo2009-11-29 03:25:29 +01002214
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002215 file_offset = (file_offset + s->sh_addralign - 1) &
2216 ~(s->sh_addralign - 1);
2217 s->sh_offset = file_offset;
2218 if (s->sh_type != SHT_NOBITS)
2219 file_offset += s->sh_size;
2220 }
b5b82df3 Thomas Preud'homme2013-12-18 11:17:17 +08002221
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002222 return file_offset;
2223}
b5b82df3 Thomas Preud'homme2013-12-18 11:17:17 +08002224
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002225static void fill_unloadable_phdr(ElfW(Phdr) *phdr, int phnum, Section *interp,
2226 Section *dynamic)
2227{
2228 ElfW(Phdr) *ph;
2229
2230 /* if interpreter, then add corresponding program header */
2231 if (interp) {
2232 ph = &phdr[0];
2233
2234 if (HAVE_PHDR)
2235 {
2236 int len = phnum * sizeof(ElfW(Phdr));
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002237
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002238 ph->p_type = PT_PHDR;
2239 ph->p_offset = sizeof(ElfW(Ehdr));
2240 ph->p_vaddr = interp->sh_addr - len;
3a58c53e bellard2002-08-18 13:17:59 +00002241 ph->p_paddr = ph->p_vaddr;
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002242 ph->p_filesz = ph->p_memsz = len;
2243 ph->p_flags = PF_R | PF_X;
2244 ph->p_align = 4; /* interp->sh_addralign; */
2245 ph++;
2246 }
3a58c53e bellard2002-08-18 13:17:59 +00002247
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002248 ph->p_type = PT_INTERP;
2249 ph->p_offset = interp->sh_offset;
2250 ph->p_vaddr = interp->sh_addr;
2251 ph->p_paddr = ph->p_vaddr;
2252 ph->p_filesz = interp->sh_size;
2253 ph->p_memsz = interp->sh_size;
2254 ph->p_flags = PF_R;
2255 ph->p_align = interp->sh_addralign;
2256 }
3a58c53e bellard2002-08-18 13:17:59 +00002257
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002258 /* if dynamic section, then add corresponding program header */
2259 if (dynamic) {
2260 ph = &phdr[phnum - 1];
2261
2262 ph->p_type = PT_DYNAMIC;
2263 ph->p_offset = dynamic->sh_offset;
2264 ph->p_vaddr = dynamic->sh_addr;
2265 ph->p_paddr = ph->p_vaddr;
2266 ph->p_filesz = dynamic->sh_size;
2267 ph->p_memsz = dynamic->sh_size;
2268 ph->p_flags = PF_R | PF_W;
2269 ph->p_align = dynamic->sh_addralign;
2270 }
2271}
c2e6daaf bellard2003-04-13 14:38:05 +00002272
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002273/* Fill the dynamic section with tags describing the address and size of
2274 sections */
2275static void fill_dynamic(TCCState *s1, struct dyn_inf *dyninf)
2276{
2277 Section *dynamic;
c2e6daaf bellard2003-04-13 14:38:05 +00002278
4aec2902 Thomas Preud'homme2013-12-18 11:17:17 +08002279 dynamic = dyninf->dynamic;
3a58c53e bellard2002-08-18 13:17:59 +00002280
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002281 /* put dynamic section entries */
2282 dynamic->data_offset = dyninf->dyn_rel_off;
2283 put_dt(dynamic, DT_HASH, s1->dynsym->hash->sh_addr);
2284 put_dt(dynamic, DT_STRTAB, dyninf->dynstr->sh_addr);
2285 put_dt(dynamic, DT_SYMTAB, s1->dynsym->sh_addr);
2286 put_dt(dynamic, DT_STRSZ, dyninf->dynstr->data_offset);
2287 put_dt(dynamic, DT_SYMENT, sizeof(ElfW(Sym)));
b14ef0e2 Edmund Grimley Evans2015-02-13 18:58:31 +00002288#if defined(TCC_TARGET_ARM64) || defined(TCC_TARGET_X86_64)
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002289 put_dt(dynamic, DT_RELA, dyninf->rel_addr);
2290 put_dt(dynamic, DT_RELASZ, dyninf->rel_size);
2291 put_dt(dynamic, DT_RELAENT, sizeof(ElfW_Rel));
0a9873aa Shinichiro Hamaji2008-12-02 03:19:25 +09002292#else
776364f3 Thomas Preud'homme2010-09-10 21:09:07 +02002293#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002294 put_dt(dynamic, DT_PLTGOT, s1->got->sh_addr);
2295 put_dt(dynamic, DT_PLTRELSZ, dyninf->rel_size);
2296 put_dt(dynamic, DT_JMPREL, dyninf->rel_addr);
2297 put_dt(dynamic, DT_PLTREL, DT_REL);
2298 put_dt(dynamic, DT_REL, dyninf->bss_addr);
2299 put_dt(dynamic, DT_RELSZ, dyninf->bss_size);
55cb2170 Luigi Rizzo2009-11-29 03:25:29 +01002300#else
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002301 put_dt(dynamic, DT_REL, dyninf->rel_addr);
2302 put_dt(dynamic, DT_RELSZ, dyninf->rel_size);
2303 put_dt(dynamic, DT_RELENT, sizeof(ElfW_Rel));
0a9873aa Shinichiro Hamaji2008-12-02 03:19:25 +09002304#endif
55cb2170 Luigi Rizzo2009-11-29 03:25:29 +01002305#endif
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002306 if (s1->do_debug)
2307 put_dt(dynamic, DT_DEBUG, 0);
2308 put_dt(dynamic, DT_NULL, 0);
2309}
b5b82df3 Thomas Preud'homme2013-12-18 11:17:17 +08002310
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002311/* Relocate remaining sections and symbols (that is those not related to
2312 dynamic linking) */
2313static int final_sections_reloc(TCCState *s1)
2314{
2315 int i;
2316 Section *s;
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002317
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002318 relocate_syms(s1, 0);
2319
2320 if (s1->nb_errors != 0)
2321 return -1;
2322
2323 /* relocate sections */
2324 /* XXX: ignore sections with allocated relocations ? */
b5b82df3
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002325 for(i = 1; i < s1->nb_sections; i++) {
2326 s = s1->sections[i];
4ba7e5dc seyko2015-03-10 14:21:14 +03002327#ifdef TCC_TARGET_I386
09d4e4f4 seyko2015-03-03 14:39:27 +03002328 if (s->reloc && s != s1->got && (s->sh_flags & SHF_ALLOC)) //gr
4ba7e5dc seyko2015-03-10 14:21:14 +03002329 /* On X86 gdb 7.3 works in any case but gdb 6.6 will crash if SHF_ALLOC
2330 checking is removed */
2331#else
2332 if (s->reloc && s != s1->got)
2333 /* On X86_64 gdb 7.3 will crash if SHF_ALLOC checking is present */
2334#endif
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002335 relocate_section(s1, s);
2336 }
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002337
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002338 /* relocate relocation entries if the relocation tables are
2339 allocated in the executable */
2340 for(i = 1; i < s1->nb_sections; i++) {
2341 s = s1->sections[i];
2342 if ((s->sh_flags & SHF_ALLOC) &&
2343 s->sh_type == SHT_RELX) {
2344 relocate_rel(s1, s);
2345 }
e5a706a0 Thomas Preud'homme2014-02-02 20:02:11 +08002346 }
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002347 return 0;
2348}
e4c7dd5e bellard2002-11-02 14:13:21 +00002349
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002350/* Create an ELF file on disk.
2351 This function handle ELF specific layout requirements */
2352static void tcc_output_elf(TCCState *s1, FILE *f, int phnum, ElfW(Phdr) *phdr,
2353 int file_offset, int *sec_order)
2354{
2355 int i, shnum, offset, size, file_type;
2356 Section *s;
2357 ElfW(Ehdr) ehdr;
2358 ElfW(Shdr) shdr, *sh;
3a58c53e bellard2002-08-18 13:17:59 +00002359
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002360 file_type = s1->output_type;
2361 shnum = s1->nb_sections;
b5b82df3 Thomas Preud'homme2013-12-18 11:17:17 +08002362
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002363 memset(&ehdr, 0, sizeof(ehdr));
2364
2365 if (phnum > 0) {
2366 ehdr.e_phentsize = sizeof(ElfW(Phdr));
2367 ehdr.e_phnum = phnum;
2368 ehdr.e_phoff = sizeof(ElfW(Ehdr));
2369 }
3a58c53e bellard2002-08-18 13:17:59 +00002370
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002371 /* align to 4 */
2372 file_offset = (file_offset + 3) & -4;
2373
2374 /* fill header */
2375 ehdr.e_ident[0] = ELFMAG0;
2376 ehdr.e_ident[1] = ELFMAG1;
2377 ehdr.e_ident[2] = ELFMAG2;
2378 ehdr.e_ident[3] = ELFMAG3;
2379 ehdr.e_ident[4] = ELFCLASSW;
2380 ehdr.e_ident[5] = ELFDATA2LSB;
2381 ehdr.e_ident[6] = EV_CURRENT;
2382#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2383 ehdr.e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
2384#endif
2385#ifdef TCC_TARGET_ARM
2386#ifdef TCC_ARM_EABI
2387 ehdr.e_ident[EI_OSABI] = 0;
2388 ehdr.e_flags = EF_ARM_EABI_VER4;
2389 if (file_type == TCC_OUTPUT_EXE || file_type == TCC_OUTPUT_DLL)
2390 ehdr.e_flags |= EF_ARM_HASENTRY;
2391 if (s1->float_abi == ARM_HARD_FLOAT)
2392 ehdr.e_flags |= EF_ARM_VFP_FLOAT;
2393 else
2394 ehdr.e_flags |= EF_ARM_SOFT_FLOAT;
2395#else
2396 ehdr.e_ident[EI_OSABI] = ELFOSABI_ARM;
2397#endif
2398#endif
2399 switch(file_type) {
2400 default:
2401 case TCC_OUTPUT_EXE:
2402 ehdr.e_type = ET_EXEC;
2403 ehdr.e_entry = get_elf_sym_addr(s1, "_start", 1);
2404 break;
2405 case TCC_OUTPUT_DLL:
2406 ehdr.e_type = ET_DYN;
2407 ehdr.e_entry = text_section->sh_addr; /* XXX: is it correct ? */
2408 break;
2409 case TCC_OUTPUT_OBJ:
2410 ehdr.e_type = ET_REL;
2411 break;
2412 }
2413 ehdr.e_machine = EM_TCC_TARGET;
2414 ehdr.e_version = EV_CURRENT;
2415 ehdr.e_shoff = file_offset;
2416 ehdr.e_ehsize = sizeof(ElfW(Ehdr));
2417 ehdr.e_shentsize = sizeof(ElfW(Shdr));
2418 ehdr.e_shnum = shnum;
2419 ehdr.e_shstrndx = shnum - 1;
2420
2421 fwrite(&ehdr, 1, sizeof(ElfW(Ehdr)), f);
2422 fwrite(phdr, 1, phnum * sizeof(ElfW(Phdr)), f);
2423 offset = sizeof(ElfW(Ehdr)) + phnum * sizeof(ElfW(Phdr));
2424
2425 sort_syms(s1, symtab_section);
2426 for(i = 1; i < s1->nb_sections; i++) {
2427 s = s1->sections[sec_order[i]];
2428 if (s->sh_type != SHT_NOBITS) {
2429 if (s->sh_type == SHT_DYNSYM)
2430 patch_dynsym_undef(s1, s);
2431 while (offset < s->sh_offset) {
2432 fputc(0, f);
2433 offset++;
3a58c53e bellard2002-08-18 13:17:59 +00002434 }
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002435 size = s->sh_size;
2436 fwrite(s->data, 1, size, f);
2437 offset += size;
3a58c53e bellard2002-08-18 13:17:59 +00002438 }
4aec2902 Thomas Preud'homme2013-12-18 11:17:17 +08002439 }
3a58c53e bellard2002-08-18 13:17:59 +00002440
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002441 /* output section headers */
2442 while (offset < ehdr.e_shoff) {
2443 fputc(0, f);
2444 offset++;
b5b82df3 Thomas Preud'homme2013-12-18 11:17:17 +08002445 }
b5b82df3 Thomas Preud'homme2013-12-18 11:17:17 +08002446
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002447 for(i = 0; i < s1->nb_sections; i++) {
2448 sh = &shdr;
2449 memset(sh, 0, sizeof(ElfW(Shdr)));
2450 s = s1->sections[i];
2451 if (s) {
2452 sh->sh_name = s->sh_name;
2453 sh->sh_type = s->sh_type;
2454 sh->sh_flags = s->sh_flags;
2455 sh->sh_entsize = s->sh_entsize;
2456 sh->sh_info = s->sh_info;
2457 if (s->link)
2458 sh->sh_link = s->link->sh_num;
2459 sh->sh_addralign = s->sh_addralign;
2460 sh->sh_addr = s->sh_addr;
2461 sh->sh_offset = s->sh_offset;
2462 sh->sh_size = s->sh_size;
2463 }
2464 fwrite(sh, 1, sizeof(ElfW(Shdr)), f);
2465 }
2466}
2467
2468/* Write an elf, coff or "binary" file */
2469static int tcc_write_elf_file(TCCState *s1, const char *filename, int phnum,
2470 ElfW(Phdr) *phdr, int file_offset, int *sec_order)
2471{
2472 int fd, mode, file_type;
2473 FILE *f;
2474
2475 file_type = s1->output_type;
3a58c53e bellard2002-08-18 13:17:59 +00002476 if (file_type == TCC_OUTPUT_OBJ)
2477 mode = 0666;
2478 else
2479 mode = 0777;
c27e76aa Changming Xu2011-03-03 21:09:18 +08002480 unlink(filename);
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002481 fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, mode);
e4c7dd5e bellard2002-11-02 14:13:21 +00002482 if (fd < 0) {
bf374a5f grischka2011-08-11 17:07:56 +02002483 tcc_error_noabort("could not write '%s'", filename);
4aec2902 Thomas Preud'homme2013-12-18 11:17:17 +08002484 return -1;
e4c7dd5e bellard2002-11-02 14:13:21 +00002485 }
38e8a230 bellard2004-10-23 22:53:42 +00002486 f = fdopen(fd, "wb");
f9181416 grischka2009-05-11 18:45:44 +02002487 if (s1->verbose)
a327c7a5 grischka2008-03-31 19:49:14 +00002488 printf("<- %s\n", filename);
38e8a230 bellard2004-10-23 22:53:42 +00002489
2490#ifdef TCC_TARGET_COFF
4aec2902 Thomas Preud'homme2013-12-18 11:17:17 +08002491 if (s1->output_format == TCC_OUTPUT_FORMAT_COFF)
38e8a230 bellard2004-10-23 22:53:42 +00002492 tcc_output_coff(s1, f);
4aec2902 Thomas Preud'homme2013-12-18 11:17:17 +08002493 else
e5a706a0 Thomas Preud'homme2014-02-02 20:02:11 +08002494#endif
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002495 if (s1->output_format == TCC_OUTPUT_FORMAT_ELF)
2496 tcc_output_elf(s1, f, phnum, phdr, file_offset, sec_order);
2497 else
2498 tcc_output_binary(s1, f, sec_order);
2499 fclose(f);
2500
2501 return 0;
2502}
2503
2504/* Output an elf, coff or binary file */
2505/* XXX: suppress unneeded sections */
2506static int elf_output_file(TCCState *s1, const char *filename)
2507{
2508 int i, ret, phnum, shnum, file_type, file_offset, *sec_order;
2509 struct dyn_inf dyninf;
2510 ElfW(Phdr) *phdr;
2511 ElfW(Sym) *sym;
2512 Section *strsec, *interp, *dynamic, *dynstr;
2513
2514 file_type = s1->output_type;
2515 s1->nb_errors = 0;
2516
2517 /* if linking, also link in runtime libraries (libc, libgcc, etc.) */
2518 if (file_type != TCC_OUTPUT_OBJ) {
2519 tcc_add_runtime(s1);
2520 }
2521
2522 phdr = NULL;
2523 sec_order = NULL;
2524 interp = dynamic = dynstr = NULL; /* avoid warning */
2525 dyninf.dyn_rel_off = 0; /* avoid warning */
2526
2527 if (file_type != TCC_OUTPUT_OBJ) {
2528 relocate_common_syms();
2529
2530 tcc_add_linker_symbols(s1);
2531
2532 if (!s1->static_link) {
2533 if (file_type == TCC_OUTPUT_EXE) {
2534 char *ptr;
2535 /* allow override the dynamic loader */
2536 const char *elfint = getenv("LD_SO");
2537 if (elfint == NULL)
2538 elfint = DEFAULT_ELFINTERP(s1);
2539 /* add interpreter section only if executable */
2540 interp = new_section(s1, ".interp", SHT_PROGBITS, SHF_ALLOC);
2541 interp->sh_addralign = 1;
2542 ptr = section_ptr_add(interp, 1 + strlen(elfint));
2543 strcpy(ptr, elfint);
2544 }
2545
2546 /* add dynamic symbol table */
2547 s1->dynsym = new_symtab(s1, ".dynsym", SHT_DYNSYM, SHF_ALLOC,
2548 ".dynstr",
2549 ".hash", SHF_ALLOC);
2550 dynstr = s1->dynsym->link;
2551
2552 /* add dynamic section */
2553 dynamic = new_section(s1, ".dynamic", SHT_DYNAMIC,
2554 SHF_ALLOC | SHF_WRITE);
2555 dynamic->link = dynstr;
2556 dynamic->sh_entsize = sizeof(ElfW(Dyn));
2557
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002558 build_got(s1);
2559
2560 if (file_type == TCC_OUTPUT_EXE) {
2561 bind_exe_dynsyms(s1);
2562
2563 if (s1->nb_errors) {
2564 ret = -1;
2565 goto the_end;
38e8a230 bellard2004-10-23 22:53:42 +00002566 }
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002567
2568 bind_libs_dynsyms(s1);
2569 } else /* shared library case: simply export all global symbols */
2570 export_global_syms(s1);
2571
2572 build_got_entries(s1);
2573
2574 /* add a list of needed dlls */
2575 for(i = 0; i < s1->nb_loaded_dlls; i++) {
2576 DLLReference *dllref = s1->loaded_dlls[i];
2577 if (dllref->level == 0)
2578 put_dt(dynamic, DT_NEEDED, put_elf_str(dynstr, dllref->name));
3a58c53e bellard2002-08-18 13:17:59 +00002579 }
b5b82df3 Thomas Preud'homme2013-12-18 11:17:17 +08002580
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002581 if (s1->rpath)
2582 put_dt(dynamic, DT_RPATH, put_elf_str(dynstr, s1->rpath));
2583
2584 /* XXX: currently, since we do not handle PIC code, we
2585 must relocate the readonly segments */
2586 if (file_type == TCC_OUTPUT_DLL) {
2587 if (s1->soname)
2588 put_dt(dynamic, DT_SONAME, put_elf_str(dynstr, s1->soname));
2589 put_dt(dynamic, DT_TEXTREL, 0);
2590 }
2591
2592 if (s1->symbolic)
2593 put_dt(dynamic, DT_SYMBOLIC, 0);
2594
2595 /* add necessary space for other entries */
2596 dyninf.dyn_rel_off = dynamic->data_offset;
2597 dynamic->data_offset += sizeof(ElfW(Dyn)) * EXTRA_RELITEMS;
2598 } else {
2599 /* still need to build got entries in case of static link */
2600 build_got_entries(s1);
e5a706a0 Thomas Preud'homme2014-02-02 20:02:11 +08002601 }
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002602 }
2603
2604 /* we add a section for symbols */
2605 strsec = new_section(s1, ".shstrtab", SHT_STRTAB, 0);
2606 put_elf_str(strsec, "");
2607
2608 /* compute number of sections */
2609 shnum = s1->nb_sections;
2610
2611 /* this array is used to reorder sections in the output file */
2612 sec_order = tcc_malloc(sizeof(int) * shnum);
2613 sec_order[0] = 0;
2614
2615 /* compute number of program headers */
2616 switch(file_type) {
2617 default:
2618 case TCC_OUTPUT_OBJ:
2619 phnum = 0;
2620 break;
2621 case TCC_OUTPUT_EXE:
2622 if (!s1->static_link)
2623 phnum = 4 + HAVE_PHDR;
2624 else
2625 phnum = 2;
2626 break;
2627 case TCC_OUTPUT_DLL:
2628 phnum = 3;
2629 break;
2630 }
2631
2632 /* Allocate strings for section names */
2633 alloc_sec_names(s1, file_type, strsec);
2634
2635 /* allocate program segment headers */
2636 phdr = tcc_mallocz(phnum * sizeof(ElfW(Phdr)));
2637
2638 /* compute section to program header mapping */
63376d77
MC
Matteo Cypriani2014-09-07 11:29:38 -04002639 file_offset = layout_sections(s1, phdr, phnum, interp, strsec, &dyninf,
2640 sec_order);
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002641
2642 /* Fill remaining program header and finalize relocation related to dynamic
2643 linking. */
2644 if (phnum > 0) {
2645 fill_unloadable_phdr(phdr, phnum, interp, dynamic);
2646 if (dynamic) {
2647 dyninf.dynamic = dynamic;
2648 dyninf.dynstr = dynstr;
2649
2650 fill_dynamic(s1, &dyninf);
2651
2652 /* put in GOT the dynamic section address and relocate PLT */
2653 put32(s1->got->data, dynamic->sh_addr);
2654 if (file_type == TCC_OUTPUT_EXE
2655#if defined(TCC_OUTPUT_DLL_WITH_PLT)
2656 || file_type == TCC_OUTPUT_DLL
2657#endif
2658 )
2659 relocate_plt(s1);
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002660
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002661 /* relocate symbols in .dynsym now that final addresses are known */
2662 for_each_elem(s1->dynsym, 1, sym, ElfW(Sym)) {
4aec2902 Thomas Preud'homme2013-12-18 11:17:17 +08002663 if (sym->st_shndx == SHN_UNDEF) {
6d055312 Michael Matz2015-02-22 05:59:06 +01002664 /* relocate to PLT if symbol corresponds to a PLT entry,
89ad24e7 gus knight2015-07-29 16:53:57 -04002665 but not if it's a weak symbol */
2666 if (ELFW(ST_BIND)(sym->st_info) == STB_WEAK)
2667 sym->st_value = 0;
2668 else if (sym->st_value)
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002669 sym->st_value += s1->plt->sh_addr;
2670 } else if (sym->st_shndx < SHN_LORESERVE) {
2671 /* do symbol relocation */
2672 sym->st_value += s1->sections[sym->st_shndx]->sh_addr;
2673 }
38e8a230 bellard2004-10-23 22:53:42 +00002674 }
3a58c53e bellard2002-08-18 13:17:59 +00002675 }
3a58c53e bellard2002-08-18 13:17:59 +00002676 }
3a58c53e bellard2002-08-18 13:17:59 +00002677
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002678 /* if building executable or DLL, then relocate each section
2679 except the GOT which is already relocated */
2680 if (file_type != TCC_OUTPUT_OBJ) {
2681 ret = final_sections_reloc(s1);
2682 if (ret)
2683 goto the_end;
2684 }
2685
6e0a658e grischka2014-05-08 17:32:29 +02002686 /* Perform relocation to GOT or PLT entries */
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08002687 if (file_type == TCC_OUTPUT_EXE && s1->static_link)
2688 fill_got(s1);
2689
2690 /* Create the ELF file with name 'filename' */
2691 ret = tcc_write_elf_file(s1, filename, phnum, phdr, file_offset, sec_order);
5cd4393a seyko2015-04-10 06:53:48 +03002692 if (s1->do_strip) {
89ad24e7 gus knight2015-07-29 16:53:57 -04002693 int rc;
2694 const char *strip_cmd = "sstrip "; // super strip utility from ELFkickers
2695 const char *null_dev = " 2> /dev/null";
2696 char buf[1050];
2697 snprintf(buf, sizeof(buf), "%s%s%s", strip_cmd, filename, null_dev);
2698 rc = system(buf);
2699 if (rc)
2700 system(buf+1); // call a strip utility from binutils
5cd4393a seyko2015-04-10 06:53:48 +03002701 }
e4c7dd5e bellard2002-11-02 14:13:21 +00002702 the_end:
2703 tcc_free(s1->symtab_to_dynsym);
4aec2902 Thomas Preud'homme2013-12-18 11:17:17 +08002704 tcc_free(sec_order);
3a58c53e bellard2002-08-18 13:17:59 +00002705 tcc_free(phdr);
e2212738 Thomas Preud'homme2012-11-04 00:40:05 +01002706 tcc_free(s1->sym_attrs);
ad956806 mingodad2014-03-25 18:06:14 +00002707 s1->sym_attrs = NULL;
e4c7dd5e bellard2002-11-02 14:13:21 +00002708 return ret;
3a58c53e bellard2002-08-18 13:17:59 +00002709}
2710
88a3ccab grischka2009-12-20 01:53:49 +01002711LIBTCCAPI int tcc_output_file(TCCState *s, const char *filename)
96bd8f2b grischka2008-05-05 22:39:43 +00002712{
2713 int ret;
2714#ifdef TCC_TARGET_PE
2715 if (s->output_type != TCC_OUTPUT_OBJ) {
2716 ret = pe_output_file(s, filename);
2717 } else
2718#endif
96bd8f2b grischka2008-05-05 22:39:43 +00002719 ret = elf_output_file(s, filename);
96bd8f2b grischka2008-05-05 22:39:43 +00002720 return ret;
2721}
2722
8c56b0cf Thomas Preud'homme2013-01-14 17:34:07 +01002723static void *load_data(int fd, unsigned long file_offset, unsigned long size)
3a58c53e bellard2002-08-18 13:17:59 +00002724{
2725 void *data;
2726
2727 data = tcc_malloc(size);
8c56b0cf
TP
Thomas Preud'homme2013-01-14 17:34:07 +01002728 lseek(fd, file_offset, SEEK_SET);
2729 read(fd, data, size);
3a58c53e bellard2002-08-18 13:17:59 +00002730 return data;
2731}
2732
2733typedef struct SectionMergeInfo {
2734 Section *s; /* corresponding existing section */
2735 unsigned long offset; /* offset of the new section in the existing section */
46169b92 bellard2003-10-04 14:45:23 +00002736 uint8_t new_section; /* true if section 's' was added */
2737 uint8_t link_once; /* true if link once section */
3a58c53e bellard2002-08-18 13:17:59 +00002738} SectionMergeInfo;
2739
2740/* load an object file and merge it with current files */
2741/* XXX: handle correctly stab (debug) info */
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002742ST_FUNC int tcc_load_object_file(TCCState *s1,
8c56b0cf Thomas Preud'homme2013-01-14 17:34:07 +01002743 int fd, unsigned long file_offset)
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002744{
7dd792ef
SH
Shinichiro Hamaji2008-11-30 08:14:07 +09002745 ElfW(Ehdr) ehdr;
2746 ElfW(Shdr) *shdr, *sh;
e4c7dd5e bellard2002-11-02 14:13:21 +00002747 int size, i, j, offset, offseti, nb_syms, sym_index, ret;
3a58c53e bellard2002-08-18 13:17:59 +00002748 unsigned char *strsec, *strtab;
2749 int *old_to_new_syms;
2750 char *sh_name, *name;
2751 SectionMergeInfo *sm_table, *sm;
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09002752 ElfW(Sym) *sym, *symtab;
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +08002753 ElfW_Rel *rel;
3a58c53e bellard2002-08-18 13:17:59 +00002754 Section *s;
2755
5247bbc2 grischka2008-04-27 18:49:31 +00002756 int stab_index;
2757 int stabstr_index;
2758
2759 stab_index = stabstr_index = 0;
2760
8c56b0cf Thomas Preud'homme2013-01-14 17:34:07 +01002761 if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
e4c7dd5e bellard2002-11-02 14:13:21 +00002762 goto fail1;
3a58c53e bellard2002-08-18 13:17:59 +00002763 if (ehdr.e_ident[0] != ELFMAG0 ||
2764 ehdr.e_ident[1] != ELFMAG1 ||
2765 ehdr.e_ident[2] != ELFMAG2 ||
2766 ehdr.e_ident[3] != ELFMAG3)
e4c7dd5e bellard2002-11-02 14:13:21 +00002767 goto fail1;
3a58c53e bellard2002-08-18 13:17:59 +00002768 /* test if object file */
2769 if (ehdr.e_type != ET_REL)
e4c7dd5e bellard2002-11-02 14:13:21 +00002770 goto fail1;
3a58c53e bellard2002-08-18 13:17:59 +00002771 /* test CPU specific stuff */
2772 if (ehdr.e_ident[5] != ELFDATA2LSB ||
4df5bd2e bellard2003-10-14 22:15:56 +00002773 ehdr.e_machine != EM_TCC_TARGET) {
e4c7dd5e bellard2002-11-02 14:13:21 +00002774 fail1:
bf374a5f grischka2011-08-11 17:07:56 +02002775 tcc_error_noabort("invalid object file");
e4c7dd5e bellard2002-11-02 14:13:21 +00002776 return -1;
3a58c53e bellard2002-08-18 13:17:59 +00002777 }
2778 /* read sections */
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002779 shdr = load_data(fd, file_offset + ehdr.e_shoff,
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09002780 sizeof(ElfW(Shdr)) * ehdr.e_shnum);
3a58c53e bellard2002-08-18 13:17:59 +00002781 sm_table = tcc_mallocz(sizeof(SectionMergeInfo) * ehdr.e_shnum);
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002782
3a58c53e bellard2002-08-18 13:17:59 +00002783 /* load section names */
2784 sh = &shdr[ehdr.e_shstrndx];
2785 strsec = load_data(fd, file_offset + sh->sh_offset, sh->sh_size);
2786
2787 /* load symtab and strtab */
e4c7dd5e bellard2002-11-02 14:13:21 +00002788 old_to_new_syms = NULL;
3a58c53e bellard2002-08-18 13:17:59 +00002789 symtab = NULL;
2790 strtab = NULL;
2791 nb_syms = 0;
2792 for(i = 1; i < ehdr.e_shnum; i++) {
2793 sh = &shdr[i];
2794 if (sh->sh_type == SHT_SYMTAB) {
e4c7dd5e bellard2002-11-02 14:13:21 +00002795 if (symtab) {
bf374a5f grischka2011-08-11 17:07:56 +02002796 tcc_error_noabort("object must contain only one symtab");
e4c7dd5e bellard2002-11-02 14:13:21 +00002797 fail:
2798 ret = -1;
2799 goto the_end;
2800 }
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09002801 nb_syms = sh->sh_size / sizeof(ElfW(Sym));
3a58c53e bellard2002-08-18 13:17:59 +00002802 symtab = load_data(fd, file_offset + sh->sh_offset, sh->sh_size);
2803 sm_table[i].s = symtab_section;
2804
2805 /* now load strtab */
2806 sh = &shdr[sh->sh_link];
2807 strtab = load_data(fd, file_offset + sh->sh_offset, sh->sh_size);
2808 }
2809 }
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002810
3a58c53e bellard2002-08-18 13:17:59 +00002811 /* now examine each section and try to merge its content with the
2812 ones in memory */
2813 for(i = 1; i < ehdr.e_shnum; i++) {
2814 /* no need to examine section name strtab */
2815 if (i == ehdr.e_shstrndx)
2816 continue;
2817 sh = &shdr[i];
62d1da1b Thomas Preud'homme2014-03-09 22:52:31 +08002818 sh_name = (char *) strsec + sh->sh_name;
3a58c53e bellard2002-08-18 13:17:59 +00002819 /* ignore sections types we do not handle */
2820 if (sh->sh_type != SHT_PROGBITS &&
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002821 sh->sh_type != SHT_RELX &&
f99d3de2 grischka2007-12-04 20:38:09 +00002822#ifdef TCC_ARM_EABI
5342b32e grischka2007-12-19 17:36:42 +00002823 sh->sh_type != SHT_ARM_EXIDX &&
f99d3de2 grischka2007-12-04 20:38:09 +00002824#endif
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002825 sh->sh_type != SHT_NOBITS &&
a867f425
DG
Daniel Glöckner2010-05-15 01:26:56 +02002826 sh->sh_type != SHT_PREINIT_ARRAY &&
2827 sh->sh_type != SHT_INIT_ARRAY &&
2828 sh->sh_type != SHT_FINI_ARRAY &&
5247bbc2 grischka2008-04-27 18:49:31 +00002829 strcmp(sh_name, ".stabstr")
2830 )
3a58c53e bellard2002-08-18 13:17:59 +00002831 continue;
2832 if (sh->sh_addralign < 1)
2833 sh->sh_addralign = 1;
2834 /* find corresponding section, if any */
e4c7dd5e bellard2002-11-02 14:13:21 +00002835 for(j = 1; j < s1->nb_sections;j++) {
2836 s = s1->sections[j];
46169b92 bellard2003-10-04 14:45:23 +00002837 if (!strcmp(s->name, sh_name)) {
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002838 if (!strncmp(sh_name, ".gnu.linkonce",
46169b92 bellard2003-10-04 14:45:23 +00002839 sizeof(".gnu.linkonce") - 1)) {
2840 /* if a 'linkonce' section is already present, we
2841 do not add it again. It is a little tricky as
2842 symbols can still be defined in
2843 it. */
2844 sm_table[i].link_once = 1;
2845 goto next;
2846 } else {
2847 goto found;
2848 }
2849 }
3a58c53e bellard2002-08-18 13:17:59 +00002850 }
2851 /* not found: create new section */
e4c7dd5e bellard2002-11-02 14:13:21 +00002852 s = new_section(s1, sh_name, sh->sh_type, sh->sh_flags);
3a58c53e bellard2002-08-18 13:17:59 +00002853 /* take as much info as possible from the section. sh_link and
2854 sh_info will be updated later */
2855 s->sh_addralign = sh->sh_addralign;
2856 s->sh_entsize = sh->sh_entsize;
2857 sm_table[i].new_section = 1;
2858 found:
e4c7dd5e bellard2002-11-02 14:13:21 +00002859 if (sh->sh_type != s->sh_type) {
bf374a5f grischka2011-08-11 17:07:56 +02002860 tcc_error_noabort("invalid section type");
3a58c53e bellard2002-08-18 13:17:59 +00002861 goto fail;
e4c7dd5e bellard2002-11-02 14:13:21 +00002862 }
3a58c53e bellard2002-08-18 13:17:59 +00002863
2864 /* align start of section */
2865 offset = s->data_offset;
5247bbc2 grischka2008-04-27 18:49:31 +00002866
2867 if (0 == strcmp(sh_name, ".stab")) {
2868 stab_index = i;
2869 goto no_align;
2870 }
2871 if (0 == strcmp(sh_name, ".stabstr")) {
2872 stabstr_index = i;
2873 goto no_align;
2874 }
2875
3a58c53e bellard2002-08-18 13:17:59 +00002876 size = sh->sh_addralign - 1;
2877 offset = (offset + size) & ~size;
2878 if (sh->sh_addralign > s->sh_addralign)
2879 s->sh_addralign = sh->sh_addralign;
2880 s->data_offset = offset;
5247bbc2 grischka2008-04-27 18:49:31 +00002881 no_align:
3a58c53e bellard2002-08-18 13:17:59 +00002882 sm_table[i].offset = offset;
2883 sm_table[i].s = s;
2884 /* concatenate sections */
2885 size = sh->sh_size;
2886 if (sh->sh_type != SHT_NOBITS) {
2887 unsigned char *ptr;
8c56b0cf Thomas Preud'homme2013-01-14 17:34:07 +01002888 lseek(fd, file_offset + sh->sh_offset, SEEK_SET);
f946dffd bellard2002-08-18 14:34:57 +00002889 ptr = section_ptr_add(s, size);
8c56b0cf Thomas Preud'homme2013-01-14 17:34:07 +01002890 read(fd, ptr, size);
f946dffd bellard2002-08-18 14:34:57 +00002891 } else {
2892 s->data_offset += size;
3a58c53e bellard2002-08-18 13:17:59 +00002893 }
46169b92 bellard2003-10-04 14:45:23 +00002894 next: ;
3a58c53e bellard2002-08-18 13:17:59 +00002895 }
2896
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002897 /* gr relocate stab strings */
5247bbc2 grischka2008-04-27 18:49:31 +00002898 if (stab_index && stabstr_index) {
2899 Stab_Sym *a, *b;
2900 unsigned o;
2901 s = sm_table[stab_index].s;
2902 a = (Stab_Sym *)(s->data + sm_table[stab_index].offset);
2903 b = (Stab_Sym *)(s->data + s->data_offset);
2904 o = sm_table[stabstr_index].offset;
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08002905 while (a < b)
5247bbc2 grischka2008-04-27 18:49:31 +00002906 a->n_strx += o, a++;
2907 }
2908
3a58c53e bellard2002-08-18 13:17:59 +00002909 /* second short pass to update sh_link and sh_info fields of new
2910 sections */
3a58c53e bellard2002-08-18 13:17:59 +00002911 for(i = 1; i < ehdr.e_shnum; i++) {
2912 s = sm_table[i].s;
2913 if (!s || !sm_table[i].new_section)
2914 continue;
2915 sh = &shdr[i];
2916 if (sh->sh_link > 0)
2917 s->link = sm_table[sh->sh_link].s;
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09002918 if (sh->sh_type == SHT_RELX) {
3a58c53e bellard2002-08-18 13:17:59 +00002919 s->sh_info = sm_table[sh->sh_info].s->sh_num;
2920 /* update backward link */
e4c7dd5e bellard2002-11-02 14:13:21 +00002921 s1->sections[s->sh_info]->reloc = s;
3a58c53e bellard2002-08-18 13:17:59 +00002922 }
2923 }
2bcc187b grischka2007-10-30 15:13:21 +00002924 sm = sm_table;
3a58c53e bellard2002-08-18 13:17:59 +00002925
2926 /* resolve symbols */
2927 old_to_new_syms = tcc_mallocz(nb_syms * sizeof(int));
2928
2929 sym = symtab + 1;
2930 for(i = 1; i < nb_syms; i++, sym++) {
2931 if (sym->st_shndx != SHN_UNDEF &&
2932 sym->st_shndx < SHN_LORESERVE) {
2933 sm = &sm_table[sym->st_shndx];
46169b92 bellard2003-10-04 14:45:23 +00002934 if (sm->link_once) {
2935 /* if a symbol is in a link once section, we use the
2936 already defined symbol. It is very important to get
2937 correct relocations */
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09002938 if (ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) {
62d1da1b Thomas Preud'homme2014-03-09 22:52:31 +08002939 name = (char *) strtab + sym->st_name;
46169b92 bellard2003-10-04 14:45:23 +00002940 sym_index = find_elf_sym(symtab_section, name);
2941 if (sym_index)
2942 old_to_new_syms[i] = sym_index;
2943 }
2944 continue;
2945 }
3a58c53e bellard2002-08-18 13:17:59 +00002946 /* if no corresponding section added, no need to add symbol */
2947 if (!sm->s)
2948 continue;
2949 /* convert section number */
2950 sym->st_shndx = sm->s->sh_num;
2951 /* offset value */
2952 sym->st_value += sm->offset;
2953 }
2954 /* add symbol */
62d1da1b Thomas Preud'homme2014-03-09 22:52:31 +08002955 name = (char *) strtab + sym->st_name;
3d4b57ff
TP
Thomas Preud'homme2013-12-17 20:59:14 +08002956 sym_index = add_elf_sym(symtab_section, sym->st_value, sym->st_size,
2957 sym->st_info, sym->st_other,
d733dc75 bellard2005-04-13 21:37:06 +00002958 sym->st_shndx, name);
3a58c53e bellard2002-08-18 13:17:59 +00002959 old_to_new_syms[i] = sym_index;
2960 }
2961
2962 /* third pass to patch relocation entries */
2963 for(i = 1; i < ehdr.e_shnum; i++) {
2964 s = sm_table[i].s;
2965 if (!s)
2966 continue;
2967 sh = &shdr[i];
2968 offset = sm_table[i].offset;
2969 switch(s->sh_type) {
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09002970 case SHT_RELX:
3a58c53e bellard2002-08-18 13:17:59 +00002971 /* take relocation offset information */
2972 offseti = sm_table[sh->sh_info].offset;
55f751ac Thomas Preud'homme2013-12-17 21:02:51 +08002973 for_each_elem(s, (offset / sizeof(*rel)), rel, ElfW_Rel) {
3a58c53e bellard2002-08-18 13:17:59 +00002974 int type;
2975 unsigned sym_index;
2976 /* convert symbol index */
7dd792ef
SH
Shinichiro Hamaji2008-11-30 08:14:07 +09002977 type = ELFW(R_TYPE)(rel->r_info);
2978 sym_index = ELFW(R_SYM)(rel->r_info);
3a58c53e bellard2002-08-18 13:17:59 +00002979 /* NOTE: only one symtab assumed */
2980 if (sym_index >= nb_syms)
2981 goto invalid_reloc;
2982 sym_index = old_to_new_syms[sym_index];
d778bde7 grischka2007-11-21 17:16:31 +00002983 /* ignore link_once in rel section. */
128e46f9
DG
Daniel Glöckner2010-05-15 01:23:34 +02002984 if (!sym_index && !sm->link_once
2985#ifdef TCC_TARGET_ARM
2986 && type != R_ARM_V4BX
2987#endif
2988 ) {
3a58c53e bellard2002-08-18 13:17:59 +00002989 invalid_reloc:
bf374a5f grischka2011-08-11 17:07:56 +02002990 tcc_error_noabort("Invalid relocation entry [%2d] '%s' @ %.8x",
2bcc187b grischka2007-10-30 15:13:21 +00002991 i, strsec + sh->sh_name, rel->r_offset);
e4c7dd5e bellard2002-11-02 14:13:21 +00002992 goto fail;
3a58c53e bellard2002-08-18 13:17:59 +00002993 }
7dd792ef Shinichiro Hamaji2008-11-30 08:14:07 +09002994 rel->r_info = ELFW(R_INFO)(sym_index, type);
3a58c53e bellard2002-08-18 13:17:59 +00002995 /* offset the relocation offset */
2996 rel->r_offset += offseti;
e2212738
TP
Thomas Preud'homme2012-11-04 00:40:05 +01002997#ifdef TCC_TARGET_ARM
2998 /* Jumps and branches from a Thumb code to a PLT entry need
2999 special handling since PLT entries are ARM code.
3000 Unconditional bl instructions referencing PLT entries are
3001 handled by converting these instructions into blx
3002 instructions. Other case of instructions referencing a PLT
3003 entry require to add a Thumb stub before the PLT entry to
4aec2902
TP
Thomas Preud'homme2013-12-18 11:17:17 +08003004 switch to ARM mode. We set bit plt_thumb_stub of the
3005 attribute of a symbol to indicate such a case. */
e2212738
TP
Thomas Preud'homme2012-11-04 00:40:05 +01003006 if (type == R_ARM_THM_JUMP24)
3007 alloc_sym_attr(s1, sym_index)->plt_thumb_stub = 1;
3008#endif
3a58c53e bellard2002-08-18 13:17:59 +00003009 }
3010 break;
3011 default:
3012 break;
3013 }
3014 }
3d4b57ff Thomas Preud'homme2013-12-17 20:59:14 +08003015
e4c7dd5e bellard2002-11-02 14:13:21 +00003016 ret = 0;
3017 the_end:
3a58c53e bellard2002-08-18 13:17:59 +00003018 tcc_free(symtab);
3019 tcc_free(strtab);
3020 tcc_free(old_to_new_syms);
3021 tcc_free(sm_table);
e4c7dd5e bellard2002-11-02 14:13:21 +00003022 tcc_free(strsec);
3a58c53e bellard2002-08-18 13:17:59 +00003023 tcc_free(shdr);
e4c7dd5e bellard2002-11-02 14:13:21 +00003024 return ret;
3a58c53e bellard2002-08-18 13:17:59 +00003025}
3026
3a58c53e