1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * elf.c - ELF access library
5 * Adapted from kpatch (https://github.com/dynup/kpatch):
6 * Copyright (C) 2013-2015 Josh Poimboeuf <jpoimboe@redhat.com>
7 * Copyright (C) 2014 Seth Jennings <sjenning@redhat.com>
10 #include <sys/types.h>
19 #include <objtool/builtin.h>
21 #include <objtool/elf.h>
22 #include <objtool/warn.h>
24 #define MAX_NAME_LEN 128
26 static inline u32 str_hash(const char *str)
28 return jhash(str, strlen(str), 0);
31 #define __elf_table(name) (elf->name##_hash)
32 #define __elf_bits(name) (elf->name##_bits)
34 #define elf_hash_add(name, node, key) \
35 hlist_add_head(node, &__elf_table(name)[hash_min(key, __elf_bits(name))])
37 #define elf_hash_for_each_possible(name, obj, member, key) \
38 hlist_for_each_entry(obj, &__elf_table(name)[hash_min(key, __elf_bits(name))], member)
40 #define elf_alloc_hash(name, size) \
42 __elf_bits(name) = max(10, ilog2(size)); \
43 __elf_table(name) = mmap(NULL, sizeof(struct hlist_head) << __elf_bits(name), \
44 PROT_READ|PROT_WRITE, \
45 MAP_PRIVATE|MAP_ANON, -1, 0); \
46 if (__elf_table(name) == (void *)-1L) { \
47 WARN("mmap fail " #name); \
48 __elf_table(name) = NULL; \
53 static bool symbol_to_offset(struct rb_node *a, const struct rb_node *b)
55 struct symbol *sa = rb_entry(a, struct symbol, node);
56 struct symbol *sb = rb_entry(b, struct symbol, node);
58 if (sa->offset < sb->offset)
60 if (sa->offset > sb->offset)
63 if (sa->len < sb->len)
65 if (sa->len > sb->len)
73 static int symbol_by_offset(const void *key, const struct rb_node *node)
75 const struct symbol *s = rb_entry(node, struct symbol, node);
76 const unsigned long *o = key;
80 if (*o >= s->offset + s->len)
86 struct section *find_section_by_name(const struct elf *elf, const char *name)
90 elf_hash_for_each_possible(section_name, sec, name_hash, str_hash(name)) {
91 if (!strcmp(sec->name, name))
98 static struct section *find_section_by_index(struct elf *elf,
103 elf_hash_for_each_possible(section, sec, hash, idx) {
111 static struct symbol *find_symbol_by_index(struct elf *elf, unsigned int idx)
115 elf_hash_for_each_possible(symbol, sym, hash, idx) {
123 struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset)
125 struct rb_node *node;
127 rb_for_each(node, &offset, &sec->symbol_tree, symbol_by_offset) {
128 struct symbol *s = rb_entry(node, struct symbol, node);
130 if (s->offset == offset && s->type != STT_SECTION)
137 struct symbol *find_func_by_offset(struct section *sec, unsigned long offset)
139 struct rb_node *node;
141 rb_for_each(node, &offset, &sec->symbol_tree, symbol_by_offset) {
142 struct symbol *s = rb_entry(node, struct symbol, node);
144 if (s->offset == offset && s->type == STT_FUNC)
151 struct symbol *find_symbol_containing(const struct section *sec, unsigned long offset)
153 struct rb_node *node;
155 rb_for_each(node, &offset, &sec->symbol_tree, symbol_by_offset) {
156 struct symbol *s = rb_entry(node, struct symbol, node);
158 if (s->type != STT_SECTION)
165 struct symbol *find_func_containing(struct section *sec, unsigned long offset)
167 struct rb_node *node;
169 rb_for_each(node, &offset, &sec->symbol_tree, symbol_by_offset) {
170 struct symbol *s = rb_entry(node, struct symbol, node);
172 if (s->type == STT_FUNC)
179 struct symbol *find_symbol_by_name(const struct elf *elf, const char *name)
183 elf_hash_for_each_possible(symbol_name, sym, name_hash, str_hash(name)) {
184 if (!strcmp(sym->name, name))
191 struct reloc *find_reloc_by_dest_range(const struct elf *elf, struct section *sec,
192 unsigned long offset, unsigned int len)
194 struct reloc *reloc, *r = NULL;
202 for_offset_range(o, offset, offset + len) {
203 elf_hash_for_each_possible(reloc, reloc, hash,
204 sec_offset_hash(sec, o)) {
205 if (reloc->sec != sec)
208 if (reloc->offset >= offset && reloc->offset < offset + len) {
209 if (!r || reloc->offset < r->offset)
220 struct reloc *find_reloc_by_dest(const struct elf *elf, struct section *sec, unsigned long offset)
222 return find_reloc_by_dest_range(elf, sec, offset, 1);
225 static int read_sections(struct elf *elf)
229 size_t shstrndx, sections_nr;
232 if (elf_getshdrnum(elf->elf, §ions_nr)) {
233 WARN_ELF("elf_getshdrnum");
237 if (elf_getshdrstrndx(elf->elf, &shstrndx)) {
238 WARN_ELF("elf_getshdrstrndx");
242 if (!elf_alloc_hash(section, sections_nr) ||
243 !elf_alloc_hash(section_name, sections_nr))
246 for (i = 0; i < sections_nr; i++) {
247 sec = malloc(sizeof(*sec));
252 memset(sec, 0, sizeof(*sec));
254 INIT_LIST_HEAD(&sec->symbol_list);
255 INIT_LIST_HEAD(&sec->reloc_list);
257 s = elf_getscn(elf->elf, i);
259 WARN_ELF("elf_getscn");
263 sec->idx = elf_ndxscn(s);
265 if (!gelf_getshdr(s, &sec->sh)) {
266 WARN_ELF("gelf_getshdr");
270 sec->name = elf_strptr(elf->elf, shstrndx, sec->sh.sh_name);
272 WARN_ELF("elf_strptr");
276 if (sec->sh.sh_size != 0) {
277 sec->data = elf_getdata(s, NULL);
279 WARN_ELF("elf_getdata");
282 if (sec->data->d_off != 0 ||
283 sec->data->d_size != sec->sh.sh_size) {
284 WARN("unexpected data attributes for %s",
289 sec->len = sec->sh.sh_size;
291 if (sec->sh.sh_flags & SHF_EXECINSTR)
292 elf->text_size += sec->len;
294 list_add_tail(&sec->list, &elf->sections);
295 elf_hash_add(section, &sec->hash, sec->idx);
296 elf_hash_add(section_name, &sec->name_hash, str_hash(sec->name));
300 printf("nr_sections: %lu\n", (unsigned long)sections_nr);
301 printf("section_bits: %d\n", elf->section_bits);
304 /* sanity check, one more call to elf_nextscn() should return NULL */
305 if (elf_nextscn(elf->elf, s)) {
306 WARN("section entry mismatch");
313 static void elf_add_symbol(struct elf *elf, struct symbol *sym)
315 struct list_head *entry;
316 struct rb_node *pnode;
318 sym->type = GELF_ST_TYPE(sym->sym.st_info);
319 sym->bind = GELF_ST_BIND(sym->sym.st_info);
321 sym->offset = sym->sym.st_value;
322 sym->len = sym->sym.st_size;
324 rb_add(&sym->node, &sym->sec->symbol_tree, symbol_to_offset);
325 pnode = rb_prev(&sym->node);
327 entry = &rb_entry(pnode, struct symbol, node)->list;
329 entry = &sym->sec->symbol_list;
330 list_add(&sym->list, entry);
331 elf_hash_add(symbol, &sym->hash, sym->idx);
332 elf_hash_add(symbol_name, &sym->name_hash, str_hash(sym->name));
335 * Don't store empty STT_NOTYPE symbols in the rbtree. They
336 * can exist within a function, confusing the sorting.
339 rb_erase(&sym->node, &sym->sec->symbol_tree);
342 static int read_symbols(struct elf *elf)
344 struct section *symtab, *symtab_shndx, *sec;
345 struct symbol *sym, *pfunc;
348 Elf_Data *shndx_data = NULL;
351 symtab = find_section_by_name(elf, ".symtab");
353 symtab_shndx = find_section_by_name(elf, ".symtab_shndx");
355 shndx_data = symtab_shndx->data;
357 symbols_nr = symtab->sh.sh_size / symtab->sh.sh_entsize;
360 * A missing symbol table is actually possible if it's an empty
361 * .o file. This can happen for thunk_64.o. Make sure to at
362 * least allocate the symbol hash tables so we can do symbol
363 * lookups without crashing.
368 if (!elf_alloc_hash(symbol, symbols_nr) ||
369 !elf_alloc_hash(symbol_name, symbols_nr))
372 for (i = 0; i < symbols_nr; i++) {
373 sym = malloc(sizeof(*sym));
378 memset(sym, 0, sizeof(*sym));
383 if (!gelf_getsymshndx(symtab->data, shndx_data, i, &sym->sym,
385 WARN_ELF("gelf_getsymshndx");
389 sym->name = elf_strptr(elf->elf, symtab->sh.sh_link,
392 WARN_ELF("elf_strptr");
396 if ((sym->sym.st_shndx > SHN_UNDEF &&
397 sym->sym.st_shndx < SHN_LORESERVE) ||
398 (shndx_data && sym->sym.st_shndx == SHN_XINDEX)) {
399 if (sym->sym.st_shndx != SHN_XINDEX)
400 shndx = sym->sym.st_shndx;
402 sym->sec = find_section_by_index(elf, shndx);
404 WARN("couldn't find section for symbol %s",
408 if (GELF_ST_TYPE(sym->sym.st_info) == STT_SECTION) {
409 sym->name = sym->sec->name;
413 sym->sec = find_section_by_index(elf, 0);
415 elf_add_symbol(elf, sym);
419 printf("nr_symbols: %lu\n", (unsigned long)symbols_nr);
420 printf("symbol_bits: %d\n", elf->symbol_bits);
423 /* Create parent/child links for any cold subfunctions */
424 list_for_each_entry(sec, &elf->sections, list) {
425 list_for_each_entry(sym, &sec->symbol_list, list) {
426 char pname[MAX_NAME_LEN + 1];
428 if (sym->type != STT_FUNC)
431 if (sym->pfunc == NULL)
434 if (sym->cfunc == NULL)
437 coldstr = strstr(sym->name, ".cold");
441 pnamelen = coldstr - sym->name;
442 if (pnamelen > MAX_NAME_LEN) {
443 WARN("%s(): parent function name exceeds maximum length of %d characters",
444 sym->name, MAX_NAME_LEN);
448 strncpy(pname, sym->name, pnamelen);
449 pname[pnamelen] = '\0';
450 pfunc = find_symbol_by_name(elf, pname);
453 WARN("%s(): can't find parent function",
462 * Unfortunately, -fnoreorder-functions puts the child
463 * inside the parent. Remove the overlap so we can
464 * have sane assumptions.
466 * Note that pfunc->len now no longer matches
467 * pfunc->sym.st_size.
469 if (sym->sec == pfunc->sec &&
470 sym->offset >= pfunc->offset &&
471 sym->offset + sym->len == pfunc->offset + pfunc->len) {
472 pfunc->len -= sym->len;
484 static struct section *elf_create_reloc_section(struct elf *elf,
485 struct section *base,
488 int elf_add_reloc(struct elf *elf, struct section *sec, unsigned long offset,
489 unsigned int type, struct symbol *sym, int addend)
493 if (!sec->reloc && !elf_create_reloc_section(elf, sec, SHT_RELA))
496 reloc = malloc(sizeof(*reloc));
501 memset(reloc, 0, sizeof(*reloc));
503 reloc->sec = sec->reloc;
504 reloc->offset = offset;
507 reloc->addend = addend;
509 list_add_tail(&reloc->list, &sec->reloc->reloc_list);
510 elf_hash_add(reloc, &reloc->hash, reloc_hash(reloc));
512 sec->reloc->changed = true;
517 int elf_add_reloc_to_insn(struct elf *elf, struct section *sec,
518 unsigned long offset, unsigned int type,
519 struct section *insn_sec, unsigned long insn_off)
530 * The Clang assembler strips section symbols, so we have to
531 * reference the function symbol instead:
533 sym = find_symbol_containing(insn_sec, insn_off);
536 * Hack alert. This happens when we need to reference
537 * the NOP pad insn immediately after the function.
539 sym = find_symbol_containing(insn_sec, insn_off - 1);
543 WARN("can't find symbol containing %s+0x%lx", insn_sec->name, insn_off);
547 addend = insn_off - sym->offset;
550 return elf_add_reloc(elf, sec, offset, type, sym, addend);
553 static int read_rel_reloc(struct section *sec, int i, struct reloc *reloc, unsigned int *symndx)
555 if (!gelf_getrel(sec->data, i, &reloc->rel)) {
556 WARN_ELF("gelf_getrel");
559 reloc->type = GELF_R_TYPE(reloc->rel.r_info);
561 reloc->offset = reloc->rel.r_offset;
562 *symndx = GELF_R_SYM(reloc->rel.r_info);
566 static int read_rela_reloc(struct section *sec, int i, struct reloc *reloc, unsigned int *symndx)
568 if (!gelf_getrela(sec->data, i, &reloc->rela)) {
569 WARN_ELF("gelf_getrela");
572 reloc->type = GELF_R_TYPE(reloc->rela.r_info);
573 reloc->addend = reloc->rela.r_addend;
574 reloc->offset = reloc->rela.r_offset;
575 *symndx = GELF_R_SYM(reloc->rela.r_info);
579 static int read_relocs(struct elf *elf)
585 unsigned long nr_reloc, max_reloc = 0, tot_reloc = 0;
587 if (!elf_alloc_hash(reloc, elf->text_size / 16))
590 list_for_each_entry(sec, &elf->sections, list) {
591 if ((sec->sh.sh_type != SHT_RELA) &&
592 (sec->sh.sh_type != SHT_REL))
595 sec->base = find_section_by_index(elf, sec->sh.sh_info);
597 WARN("can't find base section for reloc section %s",
602 sec->base->reloc = sec;
605 for (i = 0; i < sec->sh.sh_size / sec->sh.sh_entsize; i++) {
606 reloc = malloc(sizeof(*reloc));
611 memset(reloc, 0, sizeof(*reloc));
612 switch (sec->sh.sh_type) {
614 if (read_rel_reloc(sec, i, reloc, &symndx))
618 if (read_rela_reloc(sec, i, reloc, &symndx))
626 reloc->sym = find_symbol_by_index(elf, symndx);
628 WARN("can't find reloc entry symbol %d for %s",
633 list_add_tail(&reloc->list, &sec->reloc_list);
634 elf_hash_add(reloc, &reloc->hash, reloc_hash(reloc));
638 max_reloc = max(max_reloc, nr_reloc);
639 tot_reloc += nr_reloc;
643 printf("max_reloc: %lu\n", max_reloc);
644 printf("tot_reloc: %lu\n", tot_reloc);
645 printf("reloc_bits: %d\n", elf->reloc_bits);
651 struct elf *elf_open_read(const char *name, int flags)
656 elf_version(EV_CURRENT);
658 elf = malloc(sizeof(*elf));
663 memset(elf, 0, offsetof(struct elf, sections));
665 INIT_LIST_HEAD(&elf->sections);
667 elf->fd = open(name, flags);
669 fprintf(stderr, "objtool: Can't open '%s': %s\n",
670 name, strerror(errno));
674 if ((flags & O_ACCMODE) == O_RDONLY)
675 cmd = ELF_C_READ_MMAP;
676 else if ((flags & O_ACCMODE) == O_RDWR)
681 elf->elf = elf_begin(elf->fd, cmd, NULL);
683 WARN_ELF("elf_begin");
687 if (!gelf_getehdr(elf->elf, &elf->ehdr)) {
688 WARN_ELF("gelf_getehdr");
692 if (read_sections(elf))
695 if (read_symbols(elf))
698 if (read_relocs(elf))
708 static int elf_add_string(struct elf *elf, struct section *strtab, char *str)
715 strtab = find_section_by_name(elf, ".strtab");
717 WARN("can't find .strtab section");
721 s = elf_getscn(elf->elf, strtab->idx);
723 WARN_ELF("elf_getscn");
727 data = elf_newdata(s);
729 WARN_ELF("elf_newdata");
734 data->d_size = strlen(str) + 1;
738 strtab->len += data->d_size;
739 strtab->changed = true;
744 struct symbol *elf_create_undef_symbol(struct elf *elf, const char *name)
746 struct section *symtab, *symtab_shndx;
751 sym = malloc(sizeof(*sym));
756 memset(sym, 0, sizeof(*sym));
758 sym->name = strdup(name);
760 sym->sym.st_name = elf_add_string(elf, NULL, sym->name);
761 if (sym->sym.st_name == -1)
764 sym->sym.st_info = GELF_ST_INFO(STB_GLOBAL, STT_NOTYPE);
770 symtab = find_section_by_name(elf, ".symtab");
772 WARN("can't find .symtab");
776 s = elf_getscn(elf->elf, symtab->idx);
778 WARN_ELF("elf_getscn");
782 data = elf_newdata(s);
784 WARN_ELF("elf_newdata");
788 data->d_buf = &sym->sym;
789 data->d_size = sizeof(sym->sym);
791 data->d_type = ELF_T_SYM;
793 sym->idx = symtab->len / sizeof(sym->sym);
795 symtab->len += data->d_size;
796 symtab->changed = true;
798 symtab_shndx = find_section_by_name(elf, ".symtab_shndx");
800 s = elf_getscn(elf->elf, symtab_shndx->idx);
802 WARN_ELF("elf_getscn");
806 data = elf_newdata(s);
808 WARN_ELF("elf_newdata");
812 data->d_buf = &sym->sym.st_size; /* conveniently 0 */
813 data->d_size = sizeof(Elf32_Word);
815 data->d_type = ELF_T_WORD;
817 symtab_shndx->len += 4;
818 symtab_shndx->changed = true;
821 sym->sec = find_section_by_index(elf, 0);
823 elf_add_symbol(elf, sym);
828 struct section *elf_create_section(struct elf *elf, const char *name,
829 unsigned int sh_flags, size_t entsize, int nr)
831 struct section *sec, *shstrtab;
832 size_t size = entsize * nr;
835 sec = malloc(sizeof(*sec));
840 memset(sec, 0, sizeof(*sec));
842 INIT_LIST_HEAD(&sec->symbol_list);
843 INIT_LIST_HEAD(&sec->reloc_list);
845 s = elf_newscn(elf->elf);
847 WARN_ELF("elf_newscn");
851 sec->name = strdup(name);
857 sec->idx = elf_ndxscn(s);
861 sec->data = elf_newdata(s);
863 WARN_ELF("elf_newdata");
867 sec->data->d_size = size;
868 sec->data->d_align = 1;
871 sec->data->d_buf = malloc(size);
872 if (!sec->data->d_buf) {
876 memset(sec->data->d_buf, 0, size);
879 if (!gelf_getshdr(s, &sec->sh)) {
880 WARN_ELF("gelf_getshdr");
884 sec->sh.sh_size = size;
885 sec->sh.sh_entsize = entsize;
886 sec->sh.sh_type = SHT_PROGBITS;
887 sec->sh.sh_addralign = 1;
888 sec->sh.sh_flags = SHF_ALLOC | sh_flags;
890 /* Add section name to .shstrtab (or .strtab for Clang) */
891 shstrtab = find_section_by_name(elf, ".shstrtab");
893 shstrtab = find_section_by_name(elf, ".strtab");
895 WARN("can't find .shstrtab or .strtab section");
898 sec->sh.sh_name = elf_add_string(elf, shstrtab, sec->name);
899 if (sec->sh.sh_name == -1)
902 list_add_tail(&sec->list, &elf->sections);
903 elf_hash_add(section, &sec->hash, sec->idx);
904 elf_hash_add(section_name, &sec->name_hash, str_hash(sec->name));
911 static struct section *elf_create_rel_reloc_section(struct elf *elf, struct section *base)
916 relocname = malloc(strlen(base->name) + strlen(".rel") + 1);
921 strcpy(relocname, ".rel");
922 strcat(relocname, base->name);
924 sec = elf_create_section(elf, relocname, 0, sizeof(GElf_Rel), 0);
932 sec->sh.sh_type = SHT_REL;
933 sec->sh.sh_addralign = 8;
934 sec->sh.sh_link = find_section_by_name(elf, ".symtab")->idx;
935 sec->sh.sh_info = base->idx;
936 sec->sh.sh_flags = SHF_INFO_LINK;
941 static struct section *elf_create_rela_reloc_section(struct elf *elf, struct section *base)
946 relocname = malloc(strlen(base->name) + strlen(".rela") + 1);
951 strcpy(relocname, ".rela");
952 strcat(relocname, base->name);
954 sec = elf_create_section(elf, relocname, 0, sizeof(GElf_Rela), 0);
962 sec->sh.sh_type = SHT_RELA;
963 sec->sh.sh_addralign = 8;
964 sec->sh.sh_link = find_section_by_name(elf, ".symtab")->idx;
965 sec->sh.sh_info = base->idx;
966 sec->sh.sh_flags = SHF_INFO_LINK;
971 static struct section *elf_create_reloc_section(struct elf *elf,
972 struct section *base,
976 case SHT_REL: return elf_create_rel_reloc_section(elf, base);
977 case SHT_RELA: return elf_create_rela_reloc_section(elf, base);
978 default: return NULL;
982 static int elf_rebuild_rel_reloc_section(struct section *sec, int nr)
988 /* Allocate a buffer for relocations */
989 size = nr * sizeof(GElf_Rel);
996 sec->data->d_buf = buf;
997 sec->data->d_size = size;
998 sec->data->d_type = ELF_T_REL;
1000 sec->sh.sh_size = size;
1003 list_for_each_entry(reloc, &sec->reloc_list, list) {
1004 reloc->rel.r_offset = reloc->offset;
1005 reloc->rel.r_info = GELF_R_INFO(reloc->sym->idx, reloc->type);
1006 gelf_update_rel(sec->data, idx, &reloc->rel);
1013 static int elf_rebuild_rela_reloc_section(struct section *sec, int nr)
1015 struct reloc *reloc;
1019 /* Allocate a buffer for relocations with addends */
1020 size = nr * sizeof(GElf_Rela);
1027 sec->data->d_buf = buf;
1028 sec->data->d_size = size;
1029 sec->data->d_type = ELF_T_RELA;
1031 sec->sh.sh_size = size;
1034 list_for_each_entry(reloc, &sec->reloc_list, list) {
1035 reloc->rela.r_offset = reloc->offset;
1036 reloc->rela.r_addend = reloc->addend;
1037 reloc->rela.r_info = GELF_R_INFO(reloc->sym->idx, reloc->type);
1038 gelf_update_rela(sec->data, idx, &reloc->rela);
1045 static int elf_rebuild_reloc_section(struct elf *elf, struct section *sec)
1047 struct reloc *reloc;
1051 list_for_each_entry(reloc, &sec->reloc_list, list)
1054 switch (sec->sh.sh_type) {
1055 case SHT_REL: return elf_rebuild_rel_reloc_section(sec, nr);
1056 case SHT_RELA: return elf_rebuild_rela_reloc_section(sec, nr);
1061 int elf_write_insn(struct elf *elf, struct section *sec,
1062 unsigned long offset, unsigned int len,
1065 Elf_Data *data = sec->data;
1067 if (data->d_type != ELF_T_BYTE || data->d_off) {
1068 WARN("write to unexpected data for section: %s", sec->name);
1072 memcpy(data->d_buf + offset, insn, len);
1073 elf_flagdata(data, ELF_C_SET, ELF_F_DIRTY);
1075 elf->changed = true;
1080 int elf_write_reloc(struct elf *elf, struct reloc *reloc)
1082 struct section *sec = reloc->sec;
1084 if (sec->sh.sh_type == SHT_REL) {
1085 reloc->rel.r_info = GELF_R_INFO(reloc->sym->idx, reloc->type);
1086 reloc->rel.r_offset = reloc->offset;
1088 if (!gelf_update_rel(sec->data, reloc->idx, &reloc->rel)) {
1089 WARN_ELF("gelf_update_rel");
1093 reloc->rela.r_info = GELF_R_INFO(reloc->sym->idx, reloc->type);
1094 reloc->rela.r_addend = reloc->addend;
1095 reloc->rela.r_offset = reloc->offset;
1097 if (!gelf_update_rela(sec->data, reloc->idx, &reloc->rela)) {
1098 WARN_ELF("gelf_update_rela");
1103 elf->changed = true;
1108 int elf_write(struct elf *elf)
1110 struct section *sec;
1113 /* Update changed relocation sections and section headers: */
1114 list_for_each_entry(sec, &elf->sections, list) {
1117 elf_rebuild_reloc_section(elf, sec)) {
1118 WARN("elf_rebuild_reloc_section");
1122 s = elf_getscn(elf->elf, sec->idx);
1124 WARN_ELF("elf_getscn");
1127 if (!gelf_update_shdr(s, &sec->sh)) {
1128 WARN_ELF("gelf_update_shdr");
1132 sec->changed = false;
1133 elf->changed = true;
1137 /* Make sure the new section header entries get updated properly. */
1138 elf_flagelf(elf->elf, ELF_C_SET, ELF_F_DIRTY);
1140 /* Write all changes to the file. */
1141 if (elf_update(elf->elf, ELF_C_WRITE) < 0) {
1142 WARN_ELF("elf_update");
1146 elf->changed = false;
1151 void elf_close(struct elf *elf)
1153 struct section *sec, *tmpsec;
1154 struct symbol *sym, *tmpsym;
1155 struct reloc *reloc, *tmpreloc;
1163 list_for_each_entry_safe(sec, tmpsec, &elf->sections, list) {
1164 list_for_each_entry_safe(sym, tmpsym, &sec->symbol_list, list) {
1165 list_del(&sym->list);
1166 hash_del(&sym->hash);
1169 list_for_each_entry_safe(reloc, tmpreloc, &sec->reloc_list, list) {
1170 list_del(&reloc->list);
1171 hash_del(&reloc->hash);
1174 list_del(&sec->list);