1 // SPDX-License-Identifier: GPL-2.0-only <<
2 /* 1 /*
3 * 32-bit compatibility support for ELF format 2 * 32-bit compatibility support for ELF format executables and core dumps.
4 * 3 *
5 * Copyright (C) 2007 Red Hat, Inc. All right 4 * Copyright (C) 2007 Red Hat, Inc. All rights reserved.
6 * 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 *
7 * Red Hat Author: Roland McGrath. 10 * Red Hat Author: Roland McGrath.
8 * 11 *
9 * This file is used in a 64-bit kernel that w 12 * This file is used in a 64-bit kernel that wants to support 32-bit ELF.
10 * asm/elf.h is responsible for defining the c 13 * asm/elf.h is responsible for defining the compat_* and COMPAT_* macros
11 * used below, with definitions appropriate fo 14 * used below, with definitions appropriate for 32-bit ABI compatibility.
12 * 15 *
13 * We use macros to rename the ABI types and m 16 * We use macros to rename the ABI types and machine-dependent
14 * functions used in binfmt_elf.c to compat ve 17 * functions used in binfmt_elf.c to compat versions.
15 */ 18 */
16 19
17 #include <linux/elfcore-compat.h> 20 #include <linux/elfcore-compat.h>
18 #include <linux/time.h> 21 #include <linux/time.h>
19 22
20 #define ELF_COMPAT 1 <<
21 <<
22 /* 23 /*
23 * Rename the basic ELF layout types to refer 24 * Rename the basic ELF layout types to refer to the 32-bit class of files.
24 */ 25 */
25 #undef ELF_CLASS 26 #undef ELF_CLASS
26 #define ELF_CLASS ELFCLASS32 27 #define ELF_CLASS ELFCLASS32
27 28
28 #undef elfhdr 29 #undef elfhdr
29 #undef elf_phdr 30 #undef elf_phdr
30 #undef elf_shdr 31 #undef elf_shdr
31 #undef elf_note 32 #undef elf_note
32 #undef elf_addr_t 33 #undef elf_addr_t
33 #undef ELF_GNU_PROPERTY_ALIGN <<
34 #define elfhdr elf32_hdr 34 #define elfhdr elf32_hdr
35 #define elf_phdr elf32_phdr 35 #define elf_phdr elf32_phdr
36 #define elf_shdr elf32_shdr 36 #define elf_shdr elf32_shdr
37 #define elf_note elf32_note 37 #define elf_note elf32_note
38 #define elf_addr_t Elf32_Addr 38 #define elf_addr_t Elf32_Addr
39 #define ELF_GNU_PROPERTY_ALIGN ELF32_GNU_PROP <<
40 39
41 /* 40 /*
42 * Some data types as stored in coredump. 41 * Some data types as stored in coredump.
43 */ 42 */
44 #define user_long_t compat_long_t 43 #define user_long_t compat_long_t
45 #define user_siginfo_t compat_siginfo 44 #define user_siginfo_t compat_siginfo_t
46 #define copy_siginfo_to_external copy_s !! 45 #define copy_siginfo_to_user copy_siginfo_to_user32
47 46
48 /* 47 /*
49 * The machine-dependent core note format type 48 * The machine-dependent core note format types are defined in elfcore-compat.h,
50 * which requires asm/elf.h to define compat_e 49 * which requires asm/elf.h to define compat_elf_gregset_t et al.
51 */ 50 */
52 #define elf_prstatus compat_elf_prstatus 51 #define elf_prstatus compat_elf_prstatus
53 #define elf_prstatus_common compat_elf_prs <<
54 #define elf_prpsinfo compat_elf_prpsinfo 52 #define elf_prpsinfo compat_elf_prpsinfo
55 53
56 #undef ns_to_kernel_old_timeval !! 54 #ifdef CONFIG_ELF_CORE
57 #define ns_to_kernel_old_timeval ns_to_old_tim !! 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
58 72
59 /* 73 /*
60 * To use this file, asm/elf.h must define com 74 * To use this file, asm/elf.h must define compat_elf_check_arch.
61 * The other following macros can be defined i 75 * The other following macros can be defined if the compat versions
62 * differ from the native ones, or omitted whe 76 * differ from the native ones, or omitted when they match.
63 */ 77 */
64 78
>> 79 #undef ELF_ARCH
65 #undef elf_check_arch 80 #undef elf_check_arch
66 #define elf_check_arch compat_elf_check_arch 81 #define elf_check_arch compat_elf_check_arch
67 82
68 #ifdef COMPAT_ELF_PLATFORM 83 #ifdef COMPAT_ELF_PLATFORM
69 #undef ELF_PLATFORM 84 #undef ELF_PLATFORM
70 #define ELF_PLATFORM COMPAT_ELF_PLA 85 #define ELF_PLATFORM COMPAT_ELF_PLATFORM
71 #endif 86 #endif
72 87
73 #ifdef COMPAT_ELF_HWCAP 88 #ifdef COMPAT_ELF_HWCAP
74 #undef ELF_HWCAP 89 #undef ELF_HWCAP
75 #define ELF_HWCAP COMPAT_ELF_HWC 90 #define ELF_HWCAP COMPAT_ELF_HWCAP
76 #endif 91 #endif
77 92
78 #ifdef COMPAT_ELF_HWCAP2 93 #ifdef COMPAT_ELF_HWCAP2
79 #undef ELF_HWCAP2 94 #undef ELF_HWCAP2
80 #define ELF_HWCAP2 COMPAT_ELF_HWC 95 #define ELF_HWCAP2 COMPAT_ELF_HWCAP2
81 #endif 96 #endif
82 97
83 #ifdef COMPAT_ARCH_DLINFO 98 #ifdef COMPAT_ARCH_DLINFO
84 #undef ARCH_DLINFO 99 #undef ARCH_DLINFO
85 #define ARCH_DLINFO COMPAT_ARCH_DL 100 #define ARCH_DLINFO COMPAT_ARCH_DLINFO
86 #endif 101 #endif
87 102
88 #ifdef COMPAT_ELF_ET_DYN_BASE 103 #ifdef COMPAT_ELF_ET_DYN_BASE
89 #undef ELF_ET_DYN_BASE 104 #undef ELF_ET_DYN_BASE
90 #define ELF_ET_DYN_BASE COMPAT_ELF_ET_ 105 #define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE
91 #endif 106 #endif
92 107
>> 108 #ifdef COMPAT_ELF_EXEC_PAGESIZE
>> 109 #undef ELF_EXEC_PAGESIZE
>> 110 #define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE
>> 111 #endif
>> 112
93 #ifdef COMPAT_ELF_PLAT_INIT 113 #ifdef COMPAT_ELF_PLAT_INIT
94 #undef ELF_PLAT_INIT 114 #undef ELF_PLAT_INIT
95 #define ELF_PLAT_INIT COMPAT_ELF_PLA 115 #define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT
96 #endif 116 #endif
97 117
98 #ifdef COMPAT_SET_PERSONALITY 118 #ifdef COMPAT_SET_PERSONALITY
99 #undef SET_PERSONALITY 119 #undef SET_PERSONALITY
100 #define SET_PERSONALITY COMPAT_SET_PER 120 #define SET_PERSONALITY COMPAT_SET_PERSONALITY
101 #endif 121 #endif
102 122
103 #ifdef compat_start_thread 123 #ifdef compat_start_thread
104 #define COMPAT_START_THREAD(ex, regs, new_ip, !! 124 #undef start_thread
105 compat_start_thread(regs, new_ip, new_ !! 125 #define start_thread compat_start_thread
106 #endif <<
107 <<
108 #ifdef COMPAT_START_THREAD <<
109 #undef START_THREAD <<
110 #define START_THREAD COMPAT_START_T <<
111 #endif 126 #endif
112 127
113 #ifdef compat_arch_setup_additional_pages !! 128 #ifdef compat_arch_setup_additional_pages
114 #define COMPAT_ARCH_SETUP_ADDITIONAL_PAGES(bpr <<
115 compat_arch_setup_additional_pages(bpr <<
116 #endif <<
117 <<
118 #ifdef COMPAT_ARCH_SETUP_ADDITIONAL_PAGES <<
119 #undef ARCH_HAS_SETUP_ADDITIONAL_PAGES 129 #undef ARCH_HAS_SETUP_ADDITIONAL_PAGES
120 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 130 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
121 #undef ARCH_SETUP_ADDITIONAL_PAGES !! 131 #undef arch_setup_additional_pages
122 #define ARCH_SETUP_ADDITIONAL_PAGES COMPAT_ARC !! 132 #define arch_setup_additional_pages compat_arch_setup_additional_pages
123 #endif <<
124 <<
125 #ifdef compat_elf_read_implies_exec <<
126 #undef elf_read_implies_exec <<
127 #define elf_read_implies_exec compat_elf_read_ <<
128 #endif 133 #endif
129 134
130 /* 135 /*
131 * Rename a few of the symbols that binfmt_elf 136 * Rename a few of the symbols that binfmt_elf.c will define.
132 * These are all local so the names don't real 137 * These are all local so the names don't really matter, but it
133 * might make some debugging less confusing no 138 * might make some debugging less confusing not to duplicate them.
134 */ 139 */
135 #define elf_format compat_elf_for 140 #define elf_format compat_elf_format
136 #define init_elf_binfmt init_compat_el 141 #define init_elf_binfmt init_compat_elf_binfmt
137 #define exit_elf_binfmt exit_compat_el 142 #define exit_elf_binfmt exit_compat_elf_binfmt
138 #define binfmt_elf_test_cases compat_binfmt_ <<
139 #define binfmt_elf_test_suite compat_binfmt_ <<
140 143
141 /* 144 /*
142 * We share all the actual code with the nativ 145 * We share all the actual code with the native (64-bit) version.
143 */ 146 */
144 #include "binfmt_elf.c" 147 #include "binfmt_elf.c"
145 148
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