| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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, rodata; |
| 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 section *rela_sec; |
| 72 | struct symbol *sym; |
| 73 | unsigned int type; |
| 74 | unsigned long offset; |
| 75 | int addend; |
| 76 | }; |
| 77 | |
| 78 | struct elf { |
| 79 | Elf *elf; |
| 80 | GElf_Ehdr ehdr; |
| 81 | int fd; |
| 82 | char *name; |
| 83 | struct list_head sections; |
| 84 | DECLARE_HASHTABLE(rela_hash, 16); |
| 85 | }; |
| 86 | |
| 87 | |
| 88 | struct elf *elf_open(const char *name, int flags); |
| 89 | struct section *find_section_by_name(struct elf *elf, const char *name); |
| 90 | struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset); |
| 91 | struct symbol *find_symbol_by_name(struct elf *elf, const char *name); |
| 92 | struct symbol *find_symbol_containing(struct section *sec, unsigned long offset); |
| 93 | struct rela *find_rela_by_dest(struct section *sec, unsigned long offset); |
| 94 | struct rela *find_rela_by_dest_range(struct section *sec, unsigned long offset, |
| 95 | unsigned int len); |
| 96 | struct symbol *find_containing_func(struct section *sec, unsigned long offset); |
| 97 | struct section *elf_create_section(struct elf *elf, const char *name, size_t |
| 98 | entsize, int nr); |
| 99 | struct section *elf_create_rela_section(struct elf *elf, struct section *base); |
| 100 | int elf_rebuild_rela_section(struct section *sec); |
| 101 | int elf_write(struct elf *elf); |
| 102 | void elf_close(struct elf *elf); |
| 103 | |
| 104 | #define for_each_sec(file, sec) \ |
| 105 | list_for_each_entry(sec, &file->elf->sections, list) |
| 106 | |
| 107 | #endif /* _OBJTOOL_ELF_H */ |