2 * 32-bit compatibility support for ELF format executables and core dumps.
4 * Copyright (C) 2007 Red Hat, Inc. All rights reserved.
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.
10 * Red Hat Author: Roland McGrath.
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.
16 * We use macros to rename the ABI types and machine-dependent
17 * functions used in binfmt_elf.c to compat versions.
20 #include <linux/elfcore-compat.h>
21 #include <linux/time.h>
24 * Rename the basic ELF layout types to refer to the 32-bit class of files.
27 #define ELF_CLASS ELFCLASS32
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
41 * Some data types as stored in coredump.
43 #define user_siginfo_t compat_siginfo_t
44 #define copy_siginfo_to_user copy_siginfo_to_user32
47 * The machine-dependent core note format types are defined in elfcore-compat.h,
48 * which requires asm/elf.h to define compat_elf_gregset_t et al.
50 #define elf_prstatus compat_elf_prstatus
51 #define elf_prpsinfo compat_elf_prpsinfo
54 * Compat version of cputime_to_compat_timeval, perhaps this
55 * should be an inline in <linux/compat.h>.
57 static void cputime_to_compat_timeval(const cputime_t cputime,
58 struct compat_timeval *value)
61 cputime_to_timeval(cputime, &tv);
62 value->tv_sec = tv.tv_sec;
63 value->tv_usec = tv.tv_usec;
66 #undef cputime_to_timeval
67 #define cputime_to_timeval cputime_to_compat_timeval
71 * To use this file, asm/elf.h must define compat_elf_check_arch.
72 * The other following macros can be defined if the compat versions
73 * differ from the native ones, or omitted when they match.
78 #define elf_check_arch compat_elf_check_arch
80 #ifdef COMPAT_ELF_PLATFORM
82 #define ELF_PLATFORM COMPAT_ELF_PLATFORM
85 #ifdef COMPAT_ELF_HWCAP
87 #define ELF_HWCAP COMPAT_ELF_HWCAP
90 #ifdef COMPAT_ARCH_DLINFO
92 #define ARCH_DLINFO COMPAT_ARCH_DLINFO
95 #ifdef COMPAT_ELF_ET_DYN_BASE
96 #undef ELF_ET_DYN_BASE
97 #define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE
100 #ifdef COMPAT_ELF_EXEC_PAGESIZE
101 #undef ELF_EXEC_PAGESIZE
102 #define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE
105 #ifdef COMPAT_ELF_PLAT_INIT
107 #define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT
110 #ifdef COMPAT_SET_PERSONALITY
111 #undef SET_PERSONALITY
112 #define SET_PERSONALITY COMPAT_SET_PERSONALITY
115 #ifdef compat_start_thread
117 #define start_thread compat_start_thread
120 #ifdef compat_arch_setup_additional_pages
121 #undef ARCH_HAS_SETUP_ADDITIONAL_PAGES
122 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
123 #undef arch_setup_additional_pages
124 #define arch_setup_additional_pages compat_arch_setup_additional_pages
128 * Rename a few of the symbols that binfmt_elf.c will define.
129 * These are all local so the names don't really matter, but it
130 * might make some debugging less confusing not to duplicate them.
132 #define elf_format compat_elf_format
133 #define init_elf_binfmt init_compat_elf_binfmt
134 #define exit_elf_binfmt exit_compat_elf_binfmt
137 * We share all the actual code with the native (64-bit) version.
139 #include "binfmt_elf.c"