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 */ 51 static 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