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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_prpsinfo compat_elf_prpsinfo
54
55#undef ns_to_kernel_old_timeval
56#define ns_to_kernel_old_timeval ns_to_old_timeval32
57
58/*
59 * To use this file, asm/elf.h must define compat_elf_check_arch.
60 * The other following macros can be defined if the compat versions
61 * differ from the native ones, or omitted when they match.
62 */
63
64#undef ELF_ARCH
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_EXEC_PAGESIZE
94#undef ELF_EXEC_PAGESIZE
95#define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE
96#endif
97
98#ifdef COMPAT_ELF_PLAT_INIT
99#undef ELF_PLAT_INIT
100#define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT
101#endif
102
103#ifdef COMPAT_SET_PERSONALITY
104#undef SET_PERSONALITY
105#define SET_PERSONALITY COMPAT_SET_PERSONALITY
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#undef ARCH_HAS_SETUP_ADDITIONAL_PAGES
115#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
116#undef arch_setup_additional_pages
117#define arch_setup_additional_pages compat_arch_setup_additional_pages
118#endif
119
120#ifdef compat_elf_read_implies_exec
121#undef elf_read_implies_exec
122#define elf_read_implies_exec compat_elf_read_implies_exec
123#endif
124
125/*
126 * Rename a few of the symbols that binfmt_elf.c will define.
127 * These are all local so the names don't really matter, but it
128 * might make some debugging less confusing not to duplicate them.
129 */
130#define elf_format compat_elf_format
131#define init_elf_binfmt init_compat_elf_binfmt
132#define exit_elf_binfmt exit_compat_elf_binfmt
133
134/*
135 * We share all the actual code with the native (64-bit) version.
136 */
137#include "binfmt_elf.c"