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 /* 32 * Fallback for systems without this "read, mmaping if possible" cmd. 33 */ 34 #ifndef ELF_C_READ_MMAP 35 #define ELF_C_READ_MMAP ELF_C_READ 36 #endif 37 38 struct section { 39 struct list_head list; 40 GElf_Shdr sh; 41 struct list_head symbol_list; 42 DECLARE_HASHTABLE(symbol_hash, 8); 43 struct list_head rela_list; 44 DECLARE_HASHTABLE(rela_hash, 16); 45 struct section *base, *rela; 46 struct symbol *sym; 47 Elf_Data *data; 48 char *name; 49 int idx; 50 unsigned int len; 51 bool changed, text; 52 }; 53 54 struct symbol { 55 struct list_head list; 56 struct hlist_node hash; 57 GElf_Sym sym; 58 struct section *sec; 59 char *name; 60 unsigned int idx; 61 unsigned char bind, type; 62 unsigned long offset; 63 unsigned int len; 64 struct symbol *pfunc, *cfunc; 65 }; 66 67 struct rela { 68 struct list_head list; 69 struct hlist_node hash; 70 GElf_Rela rela; 71 struct symbol *sym; 72 unsigned int type; 73 unsigned long offset; 74 int addend; 75 }; 76 77 struct elf { 78 Elf *elf; 79 GElf_Ehdr ehdr; 80 int fd; 81 char *name; 82 struct list_head sections; 83 DECLARE_HASHTABLE(rela_hash, 16); 84 }; 85 86 87 struct elf *elf_open(const char *name, int flags); 88 struct section *find_section_by_name(struct elf *elf, const char *name); 89 struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset); 90 struct symbol *find_symbol_by_name(struct elf *elf, const char *name); 91 struct symbol *find_symbol_containing(struct section *sec, unsigned long offset); 92 struct rela *find_rela_by_dest(struct section *sec, unsigned long offset); 93 struct rela *find_rela_by_dest_range(struct section *sec, unsigned long offset, 94 unsigned int len); 95 struct symbol *find_containing_func(struct section *sec, unsigned long offset); 96 struct section *elf_create_section(struct elf *elf, const char *name, size_t 97 entsize, int nr); 98 struct section *elf_create_rela_section(struct elf *elf, struct section *base); 99 int elf_rebuild_rela_section(struct section *sec); 100 int elf_write(struct elf *elf); 101 void elf_close(struct elf *elf); 102 103 #define for_each_sec(file, sec) \ 104 list_for_each_entry(sec, &file->elf->sections, list) 105 106 #endif /* _OBJTOOL_ELF_H */ 107
