Linux kernel mirror (for testing)
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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 *rela_sec;
61 struct symbol *sym;
62 unsigned int type;
63 unsigned long offset;
64 int addend;
65};
66
67struct elf {
68 Elf *elf;
69 GElf_Ehdr ehdr;
70 int fd;
71 char *name;
72 struct list_head sections;
73 DECLARE_HASHTABLE(rela_hash, 16);
74};
75
76
77struct elf *elf_open(const char *name, int flags);
78struct section *find_section_by_name(struct elf *elf, const char *name);
79struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset);
80struct symbol *find_symbol_by_name(struct elf *elf, const char *name);
81struct symbol *find_symbol_containing(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);
86struct section *elf_create_section(struct elf *elf, const char *name, size_t
87 entsize, int nr);
88struct section *elf_create_rela_section(struct elf *elf, struct section *base);
89int elf_rebuild_rela_section(struct section *sec);
90int elf_write(struct elf *elf);
91void elf_close(struct elf *elf);
92
93#define for_each_sec(file, sec) \
94 list_for_each_entry(sec, &file->elf->sections, list)
95
96#endif /* _OBJTOOL_ELF_H */