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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 * 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/*
55 * Compat version of cputime_to_compat_timeval, perhaps this
56 * should be an inline in <linux/compat.h>.
57 */
58static void cputime_to_compat_timeval(const cputime_t cputime,
59 struct compat_timeval *value)
60{
61 struct timeval tv;
62 cputime_to_timeval(cputime, &tv);
63 value->tv_sec = tv.tv_sec;
64 value->tv_usec = tv.tv_usec;
65}
66
67#undef cputime_to_timeval
68#define cputime_to_timeval cputime_to_compat_timeval
69
70
71/*
72 * To use this file, asm/elf.h must define compat_elf_check_arch.
73 * The other following macros can be defined if the compat versions
74 * differ from the native ones, or omitted when they match.
75 */
76
77#undef ELF_ARCH
78#undef elf_check_arch
79#define elf_check_arch compat_elf_check_arch
80
81#ifdef COMPAT_ELF_PLATFORM
82#undef ELF_PLATFORM
83#define ELF_PLATFORM COMPAT_ELF_PLATFORM
84#endif
85
86#ifdef COMPAT_ELF_HWCAP
87#undef ELF_HWCAP
88#define ELF_HWCAP COMPAT_ELF_HWCAP
89#endif
90
91#ifdef COMPAT_ELF_HWCAP2
92#undef ELF_HWCAP2
93#define ELF_HWCAP2 COMPAT_ELF_HWCAP2
94#endif
95
96#ifdef COMPAT_ARCH_DLINFO
97#undef ARCH_DLINFO
98#define ARCH_DLINFO COMPAT_ARCH_DLINFO
99#endif
100
101#ifdef COMPAT_ELF_ET_DYN_BASE
102#undef ELF_ET_DYN_BASE
103#define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE
104#endif
105
106#ifdef COMPAT_ELF_EXEC_PAGESIZE
107#undef ELF_EXEC_PAGESIZE
108#define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE
109#endif
110
111#ifdef COMPAT_ELF_PLAT_INIT
112#undef ELF_PLAT_INIT
113#define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT
114#endif
115
116#ifdef COMPAT_SET_PERSONALITY
117#undef SET_PERSONALITY
118#define SET_PERSONALITY COMPAT_SET_PERSONALITY
119#endif
120
121#ifdef compat_start_thread
122#undef start_thread
123#define start_thread compat_start_thread
124#endif
125
126#ifdef compat_arch_setup_additional_pages
127#undef ARCH_HAS_SETUP_ADDITIONAL_PAGES
128#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
129#undef arch_setup_additional_pages
130#define arch_setup_additional_pages compat_arch_setup_additional_pages
131#endif
132
133/*
134 * Rename a few of the symbols that binfmt_elf.c will define.
135 * These are all local so the names don't really matter, but it
136 * might make some debugging less confusing not to duplicate them.
137 */
138#define elf_format compat_elf_format
139#define init_elf_binfmt init_compat_elf_binfmt
140#define exit_elf_binfmt exit_compat_elf_binfmt
141
142/*
143 * We share all the actual code with the native (64-bit) version.
144 */
145#include "binfmt_elf.c"
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * 32-bit compatibility support for ELF format executables and core dumps.
4 *
5 * Copyright (C) 2007 Red Hat, Inc. All rights reserved.
6 *
7 * Red Hat Author: Roland McGrath.
8 *
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 compat_* and COMPAT_* macros
11 * used below, with definitions appropriate for 32-bit ABI compatibility.
12 *
13 * We use macros to rename the ABI types and machine-dependent
14 * functions used in binfmt_elf.c to compat versions.
15 */
16
17#include <linux/elfcore-compat.h>
18#include <linux/time.h>
19
20#define ELF_COMPAT 1
21
22/*
23 * Rename the basic ELF layout types to refer to the 32-bit class of files.
24 */
25#undef ELF_CLASS
26#define ELF_CLASS ELFCLASS32
27
28#undef elfhdr
29#undef elf_phdr
30#undef elf_shdr
31#undef elf_note
32#undef elf_addr_t
33#undef ELF_GNU_PROPERTY_ALIGN
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#define ELF_GNU_PROPERTY_ALIGN ELF32_GNU_PROPERTY_ALIGN
40
41/*
42 * Some data types as stored in coredump.
43 */
44#define user_long_t compat_long_t
45#define user_siginfo_t compat_siginfo_t
46#define copy_siginfo_to_external copy_siginfo_to_external32
47
48/*
49 * The machine-dependent core note format types are defined in elfcore-compat.h,
50 * which requires asm/elf.h to define compat_elf_gregset_t et al.
51 */
52#define elf_prstatus compat_elf_prstatus
53#define elf_prstatus_common compat_elf_prstatus_common
54#define elf_prpsinfo compat_elf_prpsinfo
55
56#undef ns_to_kernel_old_timeval
57#define ns_to_kernel_old_timeval ns_to_old_timeval32
58
59/*
60 * To use this file, asm/elf.h must define compat_elf_check_arch.
61 * The other following macros can be defined if the compat versions
62 * differ from the native ones, or omitted when they match.
63 */
64
65#undef elf_check_arch
66#define elf_check_arch compat_elf_check_arch
67
68#ifdef COMPAT_ELF_PLATFORM
69#undef ELF_PLATFORM
70#define ELF_PLATFORM COMPAT_ELF_PLATFORM
71#endif
72
73#ifdef COMPAT_ELF_HWCAP
74#undef ELF_HWCAP
75#define ELF_HWCAP COMPAT_ELF_HWCAP
76#endif
77
78#ifdef COMPAT_ELF_HWCAP2
79#undef ELF_HWCAP2
80#define ELF_HWCAP2 COMPAT_ELF_HWCAP2
81#endif
82
83#ifdef COMPAT_ARCH_DLINFO
84#undef ARCH_DLINFO
85#define ARCH_DLINFO COMPAT_ARCH_DLINFO
86#endif
87
88#ifdef COMPAT_ELF_ET_DYN_BASE
89#undef ELF_ET_DYN_BASE
90#define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE
91#endif
92
93#ifdef COMPAT_ELF_PLAT_INIT
94#undef ELF_PLAT_INIT
95#define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT
96#endif
97
98#ifdef COMPAT_SET_PERSONALITY
99#undef SET_PERSONALITY
100#define SET_PERSONALITY COMPAT_SET_PERSONALITY
101#endif
102
103#ifdef compat_start_thread
104#define COMPAT_START_THREAD(ex, regs, new_ip, new_sp) \
105 compat_start_thread(regs, new_ip, new_sp)
106#endif
107
108#ifdef COMPAT_START_THREAD
109#undef START_THREAD
110#define START_THREAD COMPAT_START_THREAD
111#endif
112
113#ifdef compat_arch_setup_additional_pages
114#define COMPAT_ARCH_SETUP_ADDITIONAL_PAGES(bprm, ex, interpreter) \
115 compat_arch_setup_additional_pages(bprm, interpreter)
116#endif
117
118#ifdef COMPAT_ARCH_SETUP_ADDITIONAL_PAGES
119#undef ARCH_HAS_SETUP_ADDITIONAL_PAGES
120#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
121#undef ARCH_SETUP_ADDITIONAL_PAGES
122#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_implies_exec
128#endif
129
130/*
131 * Rename a few of the symbols that binfmt_elf.c will define.
132 * These are all local so the names don't really matter, but it
133 * might make some debugging less confusing not to duplicate them.
134 */
135#define elf_format compat_elf_format
136#define init_elf_binfmt init_compat_elf_binfmt
137#define exit_elf_binfmt exit_compat_elf_binfmt
138#define binfmt_elf_test_cases compat_binfmt_elf_test_cases
139#define binfmt_elf_test_suite compat_binfmt_elf_test_suite
140
141/*
142 * We share all the actual code with the native (64-bit) version.
143 */
144#include "binfmt_elf.c"