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 #undef ns_to_timeval 55 #define ns_to_timeval ns_to_old_timeval32 56 57 /* 58 * To use this file, asm/elf.h must define compat_elf_check_arch. 59 * The other following macros can be defined if the compat versions 60 * differ from the native ones, or omitted when they match. 61 */ 62 63 #undef ELF_ARCH 64 #undef elf_check_arch 65 #define elf_check_arch compat_elf_check_arch 66 67 #ifdef COMPAT_ELF_PLATFORM 68 #undef ELF_PLATFORM 69 #define ELF_PLATFORM COMPAT_ELF_PLATFORM 70 #endif 71 72 #ifdef COMPAT_ELF_HWCAP 73 #undef ELF_HWCAP 74 #define ELF_HWCAP COMPAT_ELF_HWCAP 75 #endif 76 77 #ifdef COMPAT_ELF_HWCAP2 78 #undef ELF_HWCAP2 79 #define ELF_HWCAP2 COMPAT_ELF_HWCAP2 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