tools/objtool/elf.h

   1 /*
   2  * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #ifndef _OBJTOOL_ELF_H
  19 #define _OBJTOOL_ELF_H
  20
  21 #include <stdio.h>
  22 #include <gelf.h>
  23 #include <linux/list.h>
  24 #include <linux/hashtable.h>
  25
  26 #ifdef LIBELF_USE_DEPRECATED
  27 # define elf_getshdrnum    elf_getshnum
  28 # define elf_getshdrstrndx elf_getshstrndx
  29 #endif
  30
  31 struct section {
  32         struct list_head list;
  33         GElf_Shdr sh;
  34         struct list_head symbol_list;
  35         DECLARE_HASHTABLE(symbol_hash, 8);
  36         struct list_head rela_list;
  37         DECLARE_HASHTABLE(rela_hash, 16);
  38         struct section *base, *rela;
  39         struct symbol *sym;
  40         Elf_Data *data;
  41         char *name;
  42         int idx;
  43         unsigned int len;
  44 };
  45
  46 struct symbol {
  47         struct list_head list;
  48         struct hlist_node hash;
  49         GElf_Sym sym;
  50         struct section *sec;
  51         char *name;
  52         unsigned int idx;
  53         unsigned char bind, type;
  54         unsigned long offset;
  55         unsigned int len;
  56 };
  57
  58 struct rela {
  59         struct list_head list;
  60         struct hlist_node hash;
  61         GElf_Rela rela;
  62         struct symbol *sym;
  63         unsigned int type;
  64         unsigned long offset;
  65         int addend;
  66 };
  67
  68 struct elf {
  69         Elf *elf;
  70         GElf_Ehdr ehdr;
  71         int fd;
  72         char *name;
  73         struct list_head sections;
  74         DECLARE_HASHTABLE(rela_hash, 16);
  75 };
  76
  77
  78 struct elf *elf_open(const char *name);
  79 struct section *find_section_by_name(struct elf *elf, const char *name);
  80 struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset);
  81 struct symbol *find_symbol_containing(struct section *sec, unsigned long offset);
  82 struct rela *find_rela_by_dest(struct section *sec, unsigned long offset);
  83 struct rela *find_rela_by_dest_range(struct section *sec, unsigned long offset,
  84                                      unsigned int len);
  85 struct symbol *find_containing_func(struct section *sec, unsigned long offset);
  86 void elf_close(struct elf *elf);
  87
  88 #define for_each_sec(file, sec)                                         \
  89         list_for_each_entry(sec, &file->elf->sections, list)
  90
  91 #endif /* _OBJTOOL_ELF_H */