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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 | * The machine-dependent core note format types are defined in elfcore-compat.h, |
42 | * which requires asm/elf.h to define compat_elf_gregset_t et al. |
43 | */ |
44 | #define elf_prstatus compat_elf_prstatus |
45 | #define elf_prpsinfo compat_elf_prpsinfo |
46 | |
47 | /* |
48 | * Compat version of cputime_to_compat_timeval, perhaps this |
49 | * should be an inline in <linux/compat.h>. |
50 | */ |
51 | static void cputime_to_compat_timeval(const cputime_t cputime, |
52 | struct compat_timeval *value) |
53 | { |
54 | struct timeval tv; |
55 | cputime_to_timeval(cputime, &tv); |
56 | value->tv_sec = tv.tv_sec; |
57 | value->tv_usec = tv.tv_usec; |
58 | } |
59 | |
60 | #undef cputime_to_timeval |
61 | #define cputime_to_timeval cputime_to_compat_timeval |
62 | |
63 | |
64 | /* |
65 | * To use this file, asm/elf.h must define compat_elf_check_arch. |
66 | * The other following macros can be defined if the compat versions |
67 | * differ from the native ones, or omitted when they match. |
68 | */ |
69 | |
70 | #undef ELF_ARCH |
71 | #undef elf_check_arch |
72 | #define elf_check_arch compat_elf_check_arch |
73 | |
74 | #ifdef COMPAT_ELF_PLATFORM |
75 | #undef ELF_PLATFORM |
76 | #define ELF_PLATFORM COMPAT_ELF_PLATFORM |
77 | #endif |
78 | |
79 | #ifdef COMPAT_ELF_HWCAP |
80 | #undef ELF_HWCAP |
81 | #define ELF_HWCAP COMPAT_ELF_HWCAP |
82 | #endif |
83 | |
84 | #ifdef COMPAT_ARCH_DLINFO |
85 | #undef ARCH_DLINFO |
86 | #define ARCH_DLINFO COMPAT_ARCH_DLINFO |
87 | #endif |
88 | |
89 | #ifdef COMPAT_ELF_ET_DYN_BASE |
90 | #undef ELF_ET_DYN_BASE |
91 | #define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE |
92 | #endif |
93 | |
94 | #ifdef COMPAT_ELF_EXEC_PAGESIZE |
95 | #undef ELF_EXEC_PAGESIZE |
96 | #define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE |
97 | #endif |
98 | |
99 | #ifdef COMPAT_ELF_PLAT_INIT |
100 | #undef ELF_PLAT_INIT |
101 | #define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT |
102 | #endif |
103 | |
104 | #ifdef COMPAT_SET_PERSONALITY |
105 | #undef SET_PERSONALITY |
106 | #define SET_PERSONALITY COMPAT_SET_PERSONALITY |
107 | #endif |
108 | |
109 | #ifdef compat_start_thread |
110 | #undef start_thread |
111 | #define start_thread compat_start_thread |
112 | #endif |
113 | |
114 | #ifdef compat_arch_setup_additional_pages |
115 | #undef ARCH_HAS_SETUP_ADDITIONAL_PAGES |
116 | #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 |
117 | #undef arch_setup_additional_pages |
118 | #define arch_setup_additional_pages compat_arch_setup_additional_pages |
119 | #endif |
120 | |
121 | /* |
122 | * Rename a few of the symbols that binfmt_elf.c will define. |
123 | * These are all local so the names don't really matter, but it |
124 | * might make some debugging less confusing not to duplicate them. |
125 | */ |
126 | #define elf_format compat_elf_format |
127 | #define init_elf_binfmt init_compat_elf_binfmt |
128 | #define exit_elf_binfmt exit_compat_elf_binfmt |
129 | |
130 | /* |
131 | * We share all the actual code with the native (64-bit) version. |
132 | */ |
133 | #include "binfmt_elf.c" |
134 |
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