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 * Some data types as stored in coredump. 42 */ 43#define user_long_t compat_long_t 44#define user_siginfo_t compat_siginfo_t 45#define copy_siginfo_to_user copy_siginfo_to_user32 46 47/* 48 * The machine-dependent core note format types are defined in elfcore-compat.h, 49 * which requires asm/elf.h to define compat_elf_gregset_t et al. 50 */ 51#define elf_prstatus compat_elf_prstatus 52#define elf_prpsinfo compat_elf_prpsinfo 53 54/* 55 * Compat version of cputime_to_compat_timeval, perhaps this 56 * should be an inline in <linux/compat.h>. 57 */ 58static void cputime_to_compat_timeval(const cputime_t cputime, 59 struct compat_timeval *value) 60{ 61 struct timeval tv; 62 cputime_to_timeval(cputime, &tv); 63 value->tv_sec = tv.tv_sec; 64 value->tv_usec = tv.tv_usec; 65} 66 67#undef cputime_to_timeval 68#define cputime_to_timeval cputime_to_compat_timeval 69 70 71/* 72 * To use this file, asm/elf.h must define compat_elf_check_arch. 73 * The other following macros can be defined if the compat versions 74 * differ from the native ones, or omitted when they match. 75 */ 76 77#undef ELF_ARCH 78#undef elf_check_arch 79#define elf_check_arch compat_elf_check_arch 80 81#ifdef COMPAT_ELF_PLATFORM 82#undef ELF_PLATFORM 83#define ELF_PLATFORM COMPAT_ELF_PLATFORM 84#endif 85 86#ifdef COMPAT_ELF_HWCAP 87#undef ELF_HWCAP 88#define ELF_HWCAP COMPAT_ELF_HWCAP 89#endif 90 91#ifdef COMPAT_ELF_HWCAP2 92#undef ELF_HWCAP2 93#define ELF_HWCAP2 COMPAT_ELF_HWCAP2 94#endif 95 96#ifdef COMPAT_ARCH_DLINFO 97#undef ARCH_DLINFO 98#define ARCH_DLINFO COMPAT_ARCH_DLINFO 99#endif 100 101#ifdef COMPAT_ELF_ET_DYN_BASE 102#undef ELF_ET_DYN_BASE 103#define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE 104#endif 105 106#ifdef COMPAT_ELF_EXEC_PAGESIZE 107#undef ELF_EXEC_PAGESIZE 108#define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE 109#endif 110 111#ifdef COMPAT_ELF_PLAT_INIT 112#undef ELF_PLAT_INIT 113#define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT 114#endif 115 116#ifdef COMPAT_SET_PERSONALITY 117#undef SET_PERSONALITY 118#define SET_PERSONALITY COMPAT_SET_PERSONALITY 119#endif 120 121#ifdef compat_start_thread 122#undef start_thread 123#define start_thread compat_start_thread 124#endif 125 126#ifdef compat_arch_setup_additional_pages 127#undef ARCH_HAS_SETUP_ADDITIONAL_PAGES 128#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 129#undef arch_setup_additional_pages 130#define arch_setup_additional_pages compat_arch_setup_additional_pages 131#endif 132 133/* 134 * Rename a few of the symbols that binfmt_elf.c will define. 135 * These are all local so the names don't really matter, but it 136 * might make some debugging less confusing not to duplicate them. 137 */ 138#define elf_format compat_elf_format 139#define init_elf_binfmt init_compat_elf_binfmt 140#define exit_elf_binfmt exit_compat_elf_binfmt 141 142/* 143 * We share all the actual code with the native (64-bit) version. 144 */ 145#include "binfmt_elf.c" 146