1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2/*
 3 * Copyright (C) 2015 Josh Poimboeuf <jpoimboe@redhat.com>
 
 
 
 
 
 
 
 
 
 
 
 
 
 4 */
 5
 6#ifndef _OBJTOOL_ELF_H
 7#define _OBJTOOL_ELF_H
 8
 9#include <stdio.h>
10#include <gelf.h>
11#include <linux/list.h>
12#include <linux/hashtable.h>
13
14#ifdef LIBELF_USE_DEPRECATED
15# define elf_getshdrnum    elf_getshnum
16# define elf_getshdrstrndx elf_getshstrndx
17#endif
18
19/*
20 * Fallback for systems without this "read, mmaping if possible" cmd.
21 */
22#ifndef ELF_C_READ_MMAP
23#define ELF_C_READ_MMAP ELF_C_READ
24#endif
25
26struct section {
27	struct list_head list;
28	GElf_Shdr sh;
29	struct list_head symbol_list;
30	DECLARE_HASHTABLE(symbol_hash, 8);
31	struct list_head rela_list;
32	DECLARE_HASHTABLE(rela_hash, 16);
33	struct section *base, *rela;
34	struct symbol *sym;
35	Elf_Data *data;
36	char *name;
37	int idx;
 
38	unsigned int len;
39	bool changed, text, rodata;
40};
41
42struct symbol {
43	struct list_head list;
44	struct hlist_node hash;
45	GElf_Sym sym;
46	struct section *sec;
47	char *name;
48	unsigned int idx;
49	unsigned char bind, type;
50	unsigned long offset;
51	unsigned int len;
52	struct symbol *pfunc, *cfunc, *alias;
53	bool uaccess_safe;
54};
55
56struct rela {
57	struct list_head list;
58	struct hlist_node hash;
59	GElf_Rela rela;
60	struct section *sec;
61	struct symbol *sym;
62	unsigned int type;
63	unsigned long offset;
64	int addend;
65	bool jump_table_start;
66};
67
68struct 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
78struct elf *elf_read(const char *name, int flags);
79struct section *find_section_by_name(struct elf *elf, const char *name);
80struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset);
81struct symbol *find_symbol_by_name(struct elf *elf, const char *name);
82struct symbol *find_symbol_containing(struct section *sec, unsigned long offset);
83struct rela *find_rela_by_dest(struct section *sec, unsigned long offset);
84struct rela *find_rela_by_dest_range(struct section *sec, unsigned long offset,
85				     unsigned int len);
86struct symbol *find_containing_func(struct section *sec, unsigned long offset);
87struct section *elf_create_section(struct elf *elf, const char *name, size_t
88				   entsize, int nr);
89struct section *elf_create_rela_section(struct elf *elf, struct section *base);
90int elf_rebuild_rela_section(struct section *sec);
91int elf_write(struct elf *elf);
92void elf_close(struct elf *elf);
93
94#define for_each_sec(file, sec)						\
95	list_for_each_entry(sec, &file->elf->sections, list)
96
97#endif /* _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
 
 
 
 
 
 
 
31struct 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 *elf_data;
41	char *name;
42	int idx;
43	unsigned long data;
44	unsigned int len;
 
45};
46
47struct symbol {
48	struct list_head list;
49	struct hlist_node hash;
50	GElf_Sym sym;
51	struct section *sec;
52	char *name;
53	unsigned int idx;
54	unsigned char bind, type;
55	unsigned long offset;
56	unsigned int len;
 
 
57};
58
59struct rela {
60	struct list_head list;
61	struct hlist_node hash;
62	GElf_Rela rela;
 
63	struct symbol *sym;
64	unsigned int type;
65	unsigned long offset;
66	int addend;
 
67};
68
69struct elf {
70	Elf *elf;
71	GElf_Ehdr ehdr;
72	int fd;
73	char *name;
74	struct list_head sections;
75	DECLARE_HASHTABLE(rela_hash, 16);
76};
77
78
79struct elf *elf_open(const char *name);
80struct section *find_section_by_name(struct elf *elf, const char *name);
81struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset);
 
 
82struct rela *find_rela_by_dest(struct section *sec, unsigned long offset);
83struct rela *find_rela_by_dest_range(struct section *sec, unsigned long offset,
84				     unsigned int len);
85struct symbol *find_containing_func(struct section *sec, unsigned long offset);
 
 
 
 
 
86void elf_close(struct elf *elf);
87
88
 
89
90#endif /* _OBJTOOL_ELF_H */