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_note 32#undef elf_addr_t 33#define elfhdr elf32_hdr 34#define elf_phdr elf32_phdr 35#define elf_note elf32_note 36#define elf_addr_t Elf32_Addr 37 38/* 39 * The machine-dependent core note format types are defined in elfcore-compat.h, 40 * which requires asm/elf.h to define compat_elf_gregset_t et al. 41 */ 42#define elf_prstatus compat_elf_prstatus 43#define elf_prpsinfo compat_elf_prpsinfo 44 45/* 46 * Compat version of cputime_to_compat_timeval, perhaps this 47 * should be an inline in <linux/compat.h>. 48 */ 49static void cputime_to_compat_timeval(const cputime_t cputime, 50 struct compat_timeval *value) 51{ 52 struct timeval tv; 53 cputime_to_timeval(cputime, &tv); 54 value->tv_sec = tv.tv_sec; 55 value->tv_usec = tv.tv_usec; 56} 57 58#undef cputime_to_timeval 59#define cputime_to_timeval cputime_to_compat_timeval 60 61 62/* 63 * To use this file, asm/elf.h must define compat_elf_check_arch. 64 * The other following macros can be defined if the compat versions 65 * differ from the native ones, or omitted when they match. 66 */ 67 68#undef ELF_ARCH 69#undef elf_check_arch 70#define elf_check_arch compat_elf_check_arch 71 72#ifdef COMPAT_ELF_PLATFORM 73#undef ELF_PLATFORM 74#define ELF_PLATFORM COMPAT_ELF_PLATFORM 75#endif 76 77#ifdef COMPAT_ELF_HWCAP 78#undef ELF_HWCAP 79#define ELF_HWCAP COMPAT_ELF_HWCAP 80#endif 81 82#ifdef COMPAT_ARCH_DLINFO 83#undef ARCH_DLINFO 84#define ARCH_DLINFO COMPAT_ARCH_DLINFO 85#endif 86 87#ifdef COMPAT_ELF_ET_DYN_BASE 88#undef ELF_ET_DYN_BASE 89#define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE 90#endif 91 92#ifdef COMPAT_ELF_EXEC_PAGESIZE 93#undef ELF_EXEC_PAGESIZE 94#define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE 95#endif 96 97#ifdef COMPAT_ELF_PLAT_INIT 98#undef ELF_PLAT_INIT 99#define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT 100#endif 101 102#ifdef COMPAT_SET_PERSONALITY 103#undef SET_PERSONALITY 104#define SET_PERSONALITY COMPAT_SET_PERSONALITY 105#endif 106 107#ifdef compat_start_thread 108#undef start_thread 109#define start_thread compat_start_thread 110#endif 111 112#ifdef compat_arch_setup_additional_pages 113#undef ARCH_HAS_SETUP_ADDITIONAL_PAGES 114#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 115#undef arch_setup_additional_pages 116#define arch_setup_additional_pages compat_arch_setup_additional_pages 117#endif 118 119/* 120 * Rename a few of the symbols that binfmt_elf.c will define. 121 * These are all local so the names don't really matter, but it 122 * might make some debugging less confusing not to duplicate them. 123 */ 124#define elf_format compat_elf_format 125#define init_elf_binfmt init_compat_elf_binfmt 126#define exit_elf_binfmt exit_compat_elf_binfmt 127 128/* 129 * We share all the actual code with the native (64-bit) version. 130 */ 131#include "binfmt_elf.c" 132