Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
38struct 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
54struct 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
67struct 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
77struct 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
87struct elf *elf_open(const char *name, int flags);
88struct section *find_section_by_name(struct elf *elf, const char *name);
89struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset);
90struct symbol *find_symbol_by_name(struct elf *elf, const char *name);
91struct symbol *find_symbol_containing(struct section *sec, unsigned long offset);
92struct rela *find_rela_by_dest(struct section *sec, unsigned long offset);
93struct rela *find_rela_by_dest_range(struct section *sec, unsigned long offset,
94 unsigned int len);
95struct symbol *find_containing_func(struct section *sec, unsigned long offset);
96struct section *elf_create_section(struct elf *elf, const char *name, size_t
97 entsize, int nr);
98struct section *elf_create_rela_section(struct elf *elf, struct section *base);
99int elf_rebuild_rela_section(struct section *sec);
100int elf_write(struct elf *elf);
101void 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 */