elf_traits.h revision 5f1c94371a64b3196d4be9466099bb892df9b88e 
1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef _ELF_TRAITS_H_
6#define _ELF_TRAITS_H_
7
8// NOTE: <stdint.h> is required here before <elf.h>. This is a NDK header bug.
9#include <stdint.h>
10#include <elf.h>
11
12// ELF is a traits structure used to provide convenient aliases for
13// 32/64 bit Elf types, depending on the target CPU bitness.
14#if __SIZEOF_POINTER__ == 4
15struct ELF {
16  typedef Elf32_Ehdr Ehdr;
17  typedef Elf32_Phdr Phdr;
18  typedef Elf32_Word Word;
19  typedef Elf32_Sword Sword;
20  typedef Elf32_Addr Addr;
21  typedef Elf32_Dyn Dyn;
22  typedef Elf32_Sym Sym;
23  typedef Elf32_Rel Rel;
24  typedef Elf32_Rela Rela;
25  typedef Elf32_auxv_t auxv_t;
26
27  enum { kElfClass = ELFCLASS32 };
28  enum { kElfBits = 32 };
29
30#ifndef ELF_R_TYPE
31#define ELF_R_TYPE ELF32_R_TYPE
32#endif
33
34#ifndef ELF_R_SYM
35#define ELF_R_SYM ELF32_R_SYM
36#endif
37};
38#elif __SIZEOF_POINTER__ == 8
39struct ELF {
40  typedef Elf64_Ehdr Ehdr;
41  typedef Elf64_Phdr Phdr;
42  typedef Elf64_Word Word;
43  typedef Elf64_Sword Sword;
44  typedef Elf64_Addr Addr;
45  typedef Elf64_Dyn Dyn;
46  typedef Elf64_Sym Sym;
47  typedef Elf64_Rel Rel;
48  typedef Elf64_Rela Rela;
49  typedef Elf64_auxv_t auxv_t;
50
51  enum { kElfClass = ELFCLASS64 };
52  enum { kElfBits = 64 };
53
54#ifndef ELF_R_TYPE
55#define ELF_R_TYPE ELF64_R_TYPE
56#endif
57
58#ifndef ELF_R_SYM
59#define ELF_R_SYM ELF64_R_SYM
60#endif
61};
62#else
63#error "Unsupported target CPU bitness"
64#endif
65
66#ifdef __arm__
67#define ELF_MACHINE EM_ARM
68#elif defined(__i386__)
69#define ELF_MACHINE EM_386
70#elif defined(__x86_64__)
71#define ELF_MACHINE EM_X86_64
72#elif defined(__mips__) && !defined(__LP64__)  // mips64el defines __mips__ too
73#define ELF_MACHINE EM_MIPS
74#elif defined(__aarch64__)
75#define ELF_MACHINE EM_AARCH64
76#else
77#error "Unsupported target CPU architecture"
78#endif
79
80#endif  // _ELF_TRAITS_H_
81