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 #ifdef CONFIG_ELF_CORE
55 /*
56 * Compat version of cputime_to_compat_timeval, perhaps this
57 * should be an inline in <linux/compat.h>.
58 */
cputime_to_compat_timeval(const cputime_t cputime,struct compat_timeval * value)59 static void cputime_to_compat_timeval(const cputime_t cputime,
60 struct compat_timeval *value)
61 {
62 struct timeval tv;
63 cputime_to_timeval(cputime, &tv);
64 value->tv_sec = tv.tv_sec;
65 value->tv_usec = tv.tv_usec;
66 }
67 #endif
68
69 #undef cputime_to_timeval
70 #define cputime_to_timeval cputime_to_compat_timeval
71
72
73 /*
74 * To use this file, asm/elf.h must define compat_elf_check_arch.
75 * The other following macros can be defined if the compat versions
76 * differ from the native ones, or omitted when they match.
77 */
78
79 #undef ELF_ARCH
80 #undef elf_check_arch
81 #define elf_check_arch compat_elf_check_arch
82
83 #ifdef COMPAT_ELF_PLATFORM
84 #undef ELF_PLATFORM
85 #define ELF_PLATFORM COMPAT_ELF_PLATFORM
86 #endif
87
88 #ifdef COMPAT_ELF_HWCAP
89 #undef ELF_HWCAP
90 #define ELF_HWCAP COMPAT_ELF_HWCAP
91 #endif
92
93 #ifdef COMPAT_ELF_HWCAP2
94 #undef ELF_HWCAP2
95 #define ELF_HWCAP2 COMPAT_ELF_HWCAP2
96 #endif
97
98 #ifdef COMPAT_ARCH_DLINFO
99 #undef ARCH_DLINFO
100 #define ARCH_DLINFO COMPAT_ARCH_DLINFO
101 #endif
102
103 #ifdef COMPAT_ELF_ET_DYN_BASE
104 #undef ELF_ET_DYN_BASE
105 #define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE
106 #endif
107
108 #ifdef COMPAT_ELF_EXEC_PAGESIZE
109 #undef ELF_EXEC_PAGESIZE
110 #define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE
111 #endif
112
113 #ifdef COMPAT_ELF_PLAT_INIT
114 #undef ELF_PLAT_INIT
115 #define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT
116 #endif
117
118 #ifdef COMPAT_SET_PERSONALITY
119 #undef SET_PERSONALITY
120 #define SET_PERSONALITY COMPAT_SET_PERSONALITY
121 #endif
122
123 #ifdef compat_start_thread
124 #undef start_thread
125 #define start_thread compat_start_thread
126 #endif
127
128 #ifdef compat_arch_setup_additional_pages
129 #undef ARCH_HAS_SETUP_ADDITIONAL_PAGES
130 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
131 #undef arch_setup_additional_pages
132 #define arch_setup_additional_pages compat_arch_setup_additional_pages
133 #endif
134
135 /*
136 * Rename a few of the symbols that binfmt_elf.c will define.
137 * These are all local so the names don't really matter, but it
138 * might make some debugging less confusing not to duplicate them.
139 */
140 #define elf_format compat_elf_format
141 #define init_elf_binfmt init_compat_elf_binfmt
142 #define exit_elf_binfmt exit_compat_elf_binfmt
143
144 /*
145 * We share all the actual code with the native (64-bit) version.
146 */
147 #include "binfmt_elf.c"
148