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_note
32 #undef elf_addr_t
33 #define elfhdr elf32_hdr
34 #define elf_phdr elf32_phdr
35 #define elf_note elf32_note
36 #define elf_addr_t Elf32_Addr
37
38 /*
39 * The machine-dependent core note format types are defined in elfcore-compat.h,
40 * which requires asm/elf.h to define compat_elf_gregset_t et al.
41 */
42 #define elf_prstatus compat_elf_prstatus
43 #define elf_prpsinfo compat_elf_prpsinfo
44
45 /*
46 * Compat version of cputime_to_compat_timeval, perhaps this
47 * should be an inline in <linux/compat.h>.
48 */
49 static void cputime_to_compat_timeval(const cputime_t cputime,
50 struct compat_timeval *value)
51 {
52 struct timeval tv;
53 cputime_to_timeval(cputime, &tv);
54 value->tv_sec = tv.tv_sec;
55 value->tv_usec = tv.tv_usec;
56 }
57
58 #undef cputime_to_timeval
59 #define cputime_to_timeval cputime_to_compat_timeval
60
61
62 /*
63 * To use this file, asm/elf.h must define compat_elf_check_arch.
64 * The other following macros can be defined if the compat versions
65 * differ from the native ones, or omitted when they match.
66 */
67
68 #undef ELF_ARCH
69 #undef elf_check_arch
70 #define elf_check_arch compat_elf_check_arch
71
72 #ifdef COMPAT_ELF_PLATFORM
73 #undef ELF_PLATFORM
74 #define ELF_PLATFORM COMPAT_ELF_PLATFORM
75 #endif
76
77 #ifdef COMPAT_ELF_HWCAP
78 #undef ELF_HWCAP
79 #define ELF_HWCAP COMPAT_ELF_HWCAP
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
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