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 */ 58 static 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