1 // SPDX-License-Identifier: GPL-2.0-only
3 * 32-bit compatibility support for ELF format executables and core dumps.
5 * Copyright (C) 2007 Red Hat, Inc. All rights reserved.
7 * Red Hat Author: Roland McGrath.
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.
13 * We use macros to rename the ABI types and machine-dependent
14 * functions used in binfmt_elf.c to compat versions.
17 #include <linux/elfcore-compat.h>
18 #include <linux/time.h>
23 * Rename the basic ELF layout types to refer to the 32-bit class of files.
26 #define ELF_CLASS ELFCLASS32
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
42 * Some data types as stored in coredump.
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
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.
52 #define elf_prstatus compat_elf_prstatus
53 #define elf_prpsinfo compat_elf_prpsinfo
55 #undef ns_to_kernel_old_timeval
56 #define ns_to_kernel_old_timeval ns_to_old_timeval32
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.
66 #define elf_check_arch compat_elf_check_arch
68 #ifdef COMPAT_ELF_PLATFORM
70 #define ELF_PLATFORM COMPAT_ELF_PLATFORM
73 #ifdef COMPAT_ELF_HWCAP
75 #define ELF_HWCAP COMPAT_ELF_HWCAP
78 #ifdef COMPAT_ELF_HWCAP2
80 #define ELF_HWCAP2 COMPAT_ELF_HWCAP2
83 #ifdef COMPAT_ARCH_DLINFO
85 #define ARCH_DLINFO COMPAT_ARCH_DLINFO
88 #ifdef COMPAT_ELF_ET_DYN_BASE
89 #undef ELF_ET_DYN_BASE
90 #define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE
93 #ifdef COMPAT_ELF_EXEC_PAGESIZE
94 #undef ELF_EXEC_PAGESIZE
95 #define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE
98 #ifdef COMPAT_ELF_PLAT_INIT
100 #define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT
103 #ifdef COMPAT_SET_PERSONALITY
104 #undef SET_PERSONALITY
105 #define SET_PERSONALITY COMPAT_SET_PERSONALITY
108 #ifdef compat_start_thread
110 #define start_thread compat_start_thread
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
120 #ifdef compat_elf_read_implies_exec
121 #undef elf_read_implies_exec
122 #define elf_read_implies_exec compat_elf_read_implies_exec
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.
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
135 * We share all the actual code with the native (64-bit) version.
137 #include "binfmt_elf.c"