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/*
55 * Compat version of cputime_to_compat_timeval, perhaps this
56 * should be an inline in <linux/compat.h>.
57 */
58static void cputime_to_compat_timeval(const cputime_t cputime,
59				      struct compat_timeval *value)
60{
61	struct timeval tv;
62	cputime_to_timeval(cputime, &tv);
63	value->tv_sec = tv.tv_sec;
64	value->tv_usec = tv.tv_usec;
65}
66
67#undef cputime_to_timeval
68#define cputime_to_timeval cputime_to_compat_timeval
69
70
71/*
72 * To use this file, asm/elf.h must define compat_elf_check_arch.
73 * The other following macros can be defined if the compat versions
74 * differ from the native ones, or omitted when they match.
75 */
76
77#undef	ELF_ARCH
78#undef	elf_check_arch
79#define	elf_check_arch	compat_elf_check_arch
80
81#ifdef	COMPAT_ELF_PLATFORM
82#undef	ELF_PLATFORM
83#define	ELF_PLATFORM		COMPAT_ELF_PLATFORM
84#endif
85
86#ifdef	COMPAT_ELF_HWCAP
87#undef	ELF_HWCAP
88#define	ELF_HWCAP		COMPAT_ELF_HWCAP
89#endif
90
91#ifdef	COMPAT_ELF_HWCAP2
92#undef	ELF_HWCAP2
93#define	ELF_HWCAP2		COMPAT_ELF_HWCAP2
94#endif
95
96#ifdef	COMPAT_ARCH_DLINFO
97#undef	ARCH_DLINFO
98#define	ARCH_DLINFO		COMPAT_ARCH_DLINFO
99#endif
100
101#ifdef	COMPAT_ELF_ET_DYN_BASE
102#undef	ELF_ET_DYN_BASE
103#define	ELF_ET_DYN_BASE		COMPAT_ELF_ET_DYN_BASE
104#endif
105
106#ifdef COMPAT_ELF_EXEC_PAGESIZE
107#undef	ELF_EXEC_PAGESIZE
108#define	ELF_EXEC_PAGESIZE	COMPAT_ELF_EXEC_PAGESIZE
109#endif
110
111#ifdef	COMPAT_ELF_PLAT_INIT
112#undef	ELF_PLAT_INIT
113#define	ELF_PLAT_INIT		COMPAT_ELF_PLAT_INIT
114#endif
115
116#ifdef	COMPAT_SET_PERSONALITY
117#undef	SET_PERSONALITY
118#define	SET_PERSONALITY		COMPAT_SET_PERSONALITY
119#endif
120
121#ifdef	compat_start_thread
122#undef	start_thread
123#define	start_thread		compat_start_thread
124#endif
125
126#ifdef	compat_arch_setup_additional_pages
127#undef	ARCH_HAS_SETUP_ADDITIONAL_PAGES
128#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
129#undef	arch_setup_additional_pages
130#define	arch_setup_additional_pages compat_arch_setup_additional_pages
131#endif
132
133/*
134 * Rename a few of the symbols that binfmt_elf.c will define.
135 * These are all local so the names don't really matter, but it
136 * might make some debugging less confusing not to duplicate them.
137 */
138#define elf_format		compat_elf_format
139#define init_elf_binfmt		init_compat_elf_binfmt
140#define exit_elf_binfmt		exit_compat_elf_binfmt
141
142/*
143 * We share all the actual code with the native (64-bit) version.
144 */
145#include "binfmt_elf.c"
146