1 // SPDX-License-Identifier: GPL-2.0-only 1 // SPDX-License-Identifier: GPL-2.0-only
2 /* 2 /*
3 * 32-bit compatibility support for ELF format 3 * 32-bit compatibility support for ELF format executables and core dumps.
4 * 4 *
5 * Copyright (C) 2007 Red Hat, Inc. All right 5 * Copyright (C) 2007 Red Hat, Inc. All rights reserved.
6 * 6 *
7 * Red Hat Author: Roland McGrath. 7 * Red Hat Author: Roland McGrath.
8 * 8 *
9 * This file is used in a 64-bit kernel that w 9 * 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 10 * asm/elf.h is responsible for defining the compat_* and COMPAT_* macros
11 * used below, with definitions appropriate fo 11 * used below, with definitions appropriate for 32-bit ABI compatibility.
12 * 12 *
13 * We use macros to rename the ABI types and m 13 * We use macros to rename the ABI types and machine-dependent
14 * functions used in binfmt_elf.c to compat ve 14 * functions used in binfmt_elf.c to compat versions.
15 */ 15 */
16 16
17 #include <linux/elfcore-compat.h> 17 #include <linux/elfcore-compat.h>
18 #include <linux/time.h> 18 #include <linux/time.h>
19 19
20 #define ELF_COMPAT 1 20 #define ELF_COMPAT 1
21 21
22 /* 22 /*
23 * Rename the basic ELF layout types to refer 23 * Rename the basic ELF layout types to refer to the 32-bit class of files.
24 */ 24 */
25 #undef ELF_CLASS 25 #undef ELF_CLASS
26 #define ELF_CLASS ELFCLASS32 26 #define ELF_CLASS ELFCLASS32
27 27
28 #undef elfhdr 28 #undef elfhdr
29 #undef elf_phdr 29 #undef elf_phdr
30 #undef elf_shdr 30 #undef elf_shdr
31 #undef elf_note 31 #undef elf_note
32 #undef elf_addr_t 32 #undef elf_addr_t
33 #undef ELF_GNU_PROPERTY_ALIGN 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 39 #define ELF_GNU_PROPERTY_ALIGN ELF32_GNU_PROPERTY_ALIGN
40 40
41 /* 41 /*
42 * Some data types as stored in coredump. 42 * Some data types as stored in coredump.
43 */ 43 */
44 #define user_long_t compat_long_t 44 #define user_long_t compat_long_t
45 #define user_siginfo_t compat_siginfo 45 #define user_siginfo_t compat_siginfo_t
46 #define copy_siginfo_to_external copy_s 46 #define copy_siginfo_to_external copy_siginfo_to_external32
47 47
48 /* 48 /*
49 * The machine-dependent core note format type 49 * The machine-dependent core note format types are defined in elfcore-compat.h,
50 * which requires asm/elf.h to define compat_e 50 * which requires asm/elf.h to define compat_elf_gregset_t et al.
51 */ 51 */
52 #define elf_prstatus compat_elf_prstatus 52 #define elf_prstatus compat_elf_prstatus
53 #define elf_prstatus_common compat_elf_prs <<
54 #define elf_prpsinfo compat_elf_prpsinfo 53 #define elf_prpsinfo compat_elf_prpsinfo
55 54
56 #undef ns_to_kernel_old_timeval 55 #undef ns_to_kernel_old_timeval
57 #define ns_to_kernel_old_timeval ns_to_old_tim 56 #define ns_to_kernel_old_timeval ns_to_old_timeval32
58 57
59 /* 58 /*
60 * To use this file, asm/elf.h must define com 59 * To use this file, asm/elf.h must define compat_elf_check_arch.
61 * The other following macros can be defined i 60 * The other following macros can be defined if the compat versions
62 * differ from the native ones, or omitted whe 61 * differ from the native ones, or omitted when they match.
63 */ 62 */
64 63
>> 64 #undef ELF_ARCH
65 #undef elf_check_arch 65 #undef elf_check_arch
66 #define elf_check_arch compat_elf_check_arch 66 #define elf_check_arch compat_elf_check_arch
67 67
68 #ifdef COMPAT_ELF_PLATFORM 68 #ifdef COMPAT_ELF_PLATFORM
69 #undef ELF_PLATFORM 69 #undef ELF_PLATFORM
70 #define ELF_PLATFORM COMPAT_ELF_PLA 70 #define ELF_PLATFORM COMPAT_ELF_PLATFORM
71 #endif 71 #endif
72 72
73 #ifdef COMPAT_ELF_HWCAP 73 #ifdef COMPAT_ELF_HWCAP
74 #undef ELF_HWCAP 74 #undef ELF_HWCAP
75 #define ELF_HWCAP COMPAT_ELF_HWC 75 #define ELF_HWCAP COMPAT_ELF_HWCAP
76 #endif 76 #endif
77 77
78 #ifdef COMPAT_ELF_HWCAP2 78 #ifdef COMPAT_ELF_HWCAP2
79 #undef ELF_HWCAP2 79 #undef ELF_HWCAP2
80 #define ELF_HWCAP2 COMPAT_ELF_HWC 80 #define ELF_HWCAP2 COMPAT_ELF_HWCAP2
81 #endif 81 #endif
82 82
83 #ifdef COMPAT_ARCH_DLINFO 83 #ifdef COMPAT_ARCH_DLINFO
84 #undef ARCH_DLINFO 84 #undef ARCH_DLINFO
85 #define ARCH_DLINFO COMPAT_ARCH_DL 85 #define ARCH_DLINFO COMPAT_ARCH_DLINFO
86 #endif 86 #endif
87 87
88 #ifdef COMPAT_ELF_ET_DYN_BASE 88 #ifdef COMPAT_ELF_ET_DYN_BASE
89 #undef ELF_ET_DYN_BASE 89 #undef ELF_ET_DYN_BASE
90 #define ELF_ET_DYN_BASE COMPAT_ELF_ET_ 90 #define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE
91 #endif 91 #endif
92 92
>> 93 #ifdef COMPAT_ELF_EXEC_PAGESIZE
>> 94 #undef ELF_EXEC_PAGESIZE
>> 95 #define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE
>> 96 #endif
>> 97
93 #ifdef COMPAT_ELF_PLAT_INIT 98 #ifdef COMPAT_ELF_PLAT_INIT
94 #undef ELF_PLAT_INIT 99 #undef ELF_PLAT_INIT
95 #define ELF_PLAT_INIT COMPAT_ELF_PLA 100 #define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT
96 #endif 101 #endif
97 102
98 #ifdef COMPAT_SET_PERSONALITY 103 #ifdef COMPAT_SET_PERSONALITY
99 #undef SET_PERSONALITY 104 #undef SET_PERSONALITY
100 #define SET_PERSONALITY COMPAT_SET_PER 105 #define SET_PERSONALITY COMPAT_SET_PERSONALITY
101 #endif 106 #endif
102 107
103 #ifdef compat_start_thread 108 #ifdef compat_start_thread
104 #define COMPAT_START_THREAD(ex, regs, new_ip, 109 #define COMPAT_START_THREAD(ex, regs, new_ip, new_sp) \
105 compat_start_thread(regs, new_ip, new_ 110 compat_start_thread(regs, new_ip, new_sp)
106 #endif 111 #endif
107 112
108 #ifdef COMPAT_START_THREAD 113 #ifdef COMPAT_START_THREAD
109 #undef START_THREAD 114 #undef START_THREAD
110 #define START_THREAD COMPAT_START_T 115 #define START_THREAD COMPAT_START_THREAD
111 #endif 116 #endif
112 117
113 #ifdef compat_arch_setup_additional_pages 118 #ifdef compat_arch_setup_additional_pages
114 #define COMPAT_ARCH_SETUP_ADDITIONAL_PAGES(bpr 119 #define COMPAT_ARCH_SETUP_ADDITIONAL_PAGES(bprm, ex, interpreter) \
115 compat_arch_setup_additional_pages(bpr 120 compat_arch_setup_additional_pages(bprm, interpreter)
116 #endif 121 #endif
117 122
118 #ifdef COMPAT_ARCH_SETUP_ADDITIONAL_PAGES 123 #ifdef COMPAT_ARCH_SETUP_ADDITIONAL_PAGES
119 #undef ARCH_HAS_SETUP_ADDITIONAL_PAGES 124 #undef ARCH_HAS_SETUP_ADDITIONAL_PAGES
120 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 125 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
121 #undef ARCH_SETUP_ADDITIONAL_PAGES 126 #undef ARCH_SETUP_ADDITIONAL_PAGES
122 #define ARCH_SETUP_ADDITIONAL_PAGES COMPAT_ARC 127 #define ARCH_SETUP_ADDITIONAL_PAGES COMPAT_ARCH_SETUP_ADDITIONAL_PAGES
123 #endif 128 #endif
124 129
125 #ifdef compat_elf_read_implies_exec 130 #ifdef compat_elf_read_implies_exec
126 #undef elf_read_implies_exec 131 #undef elf_read_implies_exec
127 #define elf_read_implies_exec compat_elf_read_ 132 #define elf_read_implies_exec compat_elf_read_implies_exec
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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