1/*
2 * 32-bit compatibility support for ELF format executables and core dumps.
3 *
4 * Copyright (C) 2007 Red Hat, Inc. All rights reserved.
5 *
6 * This copyrighted material is made available to anyone wishing to use,
7 * modify, copy, or redistribute it subject to the terms and conditions
8 * of the GNU General Public License v.2.
9 *
10 * Red Hat Author: Roland McGrath.
11 *
12 * This file is used in a 64-bit kernel that wants to support 32-bit ELF.
13 * asm/elf.h is responsible for defining the compat_* and COMPAT_* macros
14 * used below, with definitions appropriate for 32-bit ABI compatibility.
15 *
16 * We use macros to rename the ABI types and machine-dependent
17 * functions used in binfmt_elf.c to compat versions.
18 */
19
20#include <linux/elfcore-compat.h>
21#include <linux/time.h>
22
23/*
24 * Rename the basic ELF layout types to refer to the 32-bit class of files.
25 */
26#undef ELF_CLASS
27#define ELF_CLASS ELFCLASS32
28
29#undef elfhdr
30#undef elf_phdr
31#undef elf_shdr
32#undef elf_note
33#undef elf_addr_t
34#define elfhdr elf32_hdr
35#define elf_phdr elf32_phdr
36#define elf_shdr elf32_shdr
37#define elf_note elf32_note
38#define elf_addr_t Elf32_Addr
39
40/*
41 * Some data types as stored in coredump.
42 */
43#define user_long_t compat_long_t
44#define user_siginfo_t compat_siginfo_t
45#define copy_siginfo_to_user copy_siginfo_to_user32
46
47/*
48 * The machine-dependent core note format types are defined in elfcore-compat.h,
49 * which requires asm/elf.h to define compat_elf_gregset_t et al.
50 */
51#define elf_prstatus compat_elf_prstatus
52#define elf_prpsinfo compat_elf_prpsinfo
53
54#undef ns_to_timeval
55#define ns_to_timeval ns_to_old_timeval32
56
57/*
58 * To use this file, asm/elf.h must define compat_elf_check_arch.
59 * The other following macros can be defined if the compat versions
60 * differ from the native ones, or omitted when they match.
61 */
62
63#undef ELF_ARCH
64#undef elf_check_arch
65#define elf_check_arch compat_elf_check_arch
66
67#ifdef COMPAT_ELF_PLATFORM
68#undef ELF_PLATFORM
69#define ELF_PLATFORM COMPAT_ELF_PLATFORM
70#endif
71
72#ifdef COMPAT_ELF_HWCAP
73#undef ELF_HWCAP
74#define ELF_HWCAP COMPAT_ELF_HWCAP
75#endif
76
77#ifdef COMPAT_ELF_HWCAP2
78#undef ELF_HWCAP2
79#define ELF_HWCAP2 COMPAT_ELF_HWCAP2
80#endif
81
82#ifdef COMPAT_ARCH_DLINFO
83#undef ARCH_DLINFO
84#define ARCH_DLINFO COMPAT_ARCH_DLINFO
85#endif
86
87#ifdef COMPAT_ELF_ET_DYN_BASE
88#undef ELF_ET_DYN_BASE
89#define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE
90#endif
91
92#ifdef COMPAT_ELF_EXEC_PAGESIZE
93#undef ELF_EXEC_PAGESIZE
94#define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE
95#endif
96
97#ifdef COMPAT_ELF_PLAT_INIT
98#undef ELF_PLAT_INIT
99#define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT
100#endif
101
102#ifdef COMPAT_SET_PERSONALITY
103#undef SET_PERSONALITY
104#define SET_PERSONALITY COMPAT_SET_PERSONALITY
105#endif
106
107#ifdef compat_start_thread
108#undef start_thread
109#define start_thread compat_start_thread
110#endif
111
112#ifdef compat_arch_setup_additional_pages
113#undef ARCH_HAS_SETUP_ADDITIONAL_PAGES
114#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
115#undef arch_setup_additional_pages
116#define arch_setup_additional_pages compat_arch_setup_additional_pages
117#endif
118
119/*
120 * Rename a few of the symbols that binfmt_elf.c will define.
121 * These are all local so the names don't really matter, but it
122 * might make some debugging less confusing not to duplicate them.
123 */
124#define elf_format compat_elf_format
125#define init_elf_binfmt init_compat_elf_binfmt
126#define exit_elf_binfmt exit_compat_elf_binfmt
127
128/*
129 * We share all the actual code with the native (64-bit) version.
130 */
131#include "binfmt_elf.c"
132