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 * The machine-dependent core note format types are defined in elfcore-compat.h, 42 * which requires asm/elf.h to define compat_elf_gregset_t et al. 43 */ 44#define elf_prstatus compat_elf_prstatus 45#define elf_prpsinfo compat_elf_prpsinfo 46 47/* 48 * Compat version of cputime_to_compat_timeval, perhaps this 49 * should be an inline in <linux/compat.h>. 50 */ 51static void cputime_to_compat_timeval(const cputime_t cputime, 52 struct compat_timeval *value) 53{ 54 struct timeval tv; 55 cputime_to_timeval(cputime, &tv); 56 value->tv_sec = tv.tv_sec; 57 value->tv_usec = tv.tv_usec; 58} 59 60#undef cputime_to_timeval 61#define cputime_to_timeval cputime_to_compat_timeval 62 63 64/* 65 * To use this file, asm/elf.h must define compat_elf_check_arch. 66 * The other following macros can be defined if the compat versions 67 * differ from the native ones, or omitted when they match. 68 */ 69 70#undef ELF_ARCH 71#undef elf_check_arch 72#define elf_check_arch compat_elf_check_arch 73 74#ifdef COMPAT_ELF_PLATFORM 75#undef ELF_PLATFORM 76#define ELF_PLATFORM COMPAT_ELF_PLATFORM 77#endif 78 79#ifdef COMPAT_ELF_HWCAP 80#undef ELF_HWCAP 81#define ELF_HWCAP COMPAT_ELF_HWCAP 82#endif 83 84#ifdef COMPAT_ARCH_DLINFO 85#undef ARCH_DLINFO 86#define ARCH_DLINFO COMPAT_ARCH_DLINFO 87#endif 88 89#ifdef COMPAT_ELF_ET_DYN_BASE 90#undef ELF_ET_DYN_BASE 91#define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE 92#endif 93 94#ifdef COMPAT_ELF_EXEC_PAGESIZE 95#undef ELF_EXEC_PAGESIZE 96#define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE 97#endif 98 99#ifdef COMPAT_ELF_PLAT_INIT 100#undef ELF_PLAT_INIT 101#define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT 102#endif 103 104#ifdef COMPAT_SET_PERSONALITY 105#undef SET_PERSONALITY 106#define SET_PERSONALITY COMPAT_SET_PERSONALITY 107#endif 108 109#ifdef compat_start_thread 110#undef start_thread 111#define start_thread compat_start_thread 112#endif 113 114#ifdef compat_arch_setup_additional_pages 115#undef ARCH_HAS_SETUP_ADDITIONAL_PAGES 116#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 117#undef arch_setup_additional_pages 118#define arch_setup_additional_pages compat_arch_setup_additional_pages 119#endif 120 121/* 122 * Rename a few of the symbols that binfmt_elf.c will define. 123 * These are all local so the names don't really matter, but it 124 * might make some debugging less confusing not to duplicate them. 125 */ 126#define elf_format compat_elf_format 127#define init_elf_binfmt init_compat_elf_binfmt 128#define exit_elf_binfmt exit_compat_elf_binfmt 129 130/* 131 * We share all the actual code with the native (64-bit) version. 132 */ 133#include "binfmt_elf.c" 134