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 */