blob: 943be5ecfcd9ddae1da2b250c5aa414931fac911
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 | */ |
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 |