1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 32-bit compatibility support for ELF format executables and core dumps. 4 * 5 * Copyright (C) 2007 Red Hat, Inc. All rights reserved. 6 * 7 * Red Hat Author: Roland McGrath. 8 * 9 * This file is used in a 64-bit kernel that wants to support 32-bit ELF. 10 * asm/elf.h is responsible for defining the compat_* and COMPAT_* macros 11 * used below, with definitions appropriate for 32-bit ABI compatibility. 12 * 13 * We use macros to rename the ABI types and machine-dependent 14 * functions used in binfmt_elf.c to compat versions. 15 */ 16 17 #include <linux/elfcore-compat.h> 18 #include <linux/time.h> 19 20 #define ELF_COMPAT 1 21 22 /* 23 * Rename the basic ELF layout types to refer to the 32-bit class of files. 24 */ 25 #undef ELF_CLASS 26 #define ELF_CLASS ELFCLASS32 27 28 #undef elfhdr 29 #undef elf_phdr 30 #undef elf_shdr 31 #undef elf_note 32 #undef elf_addr_t 33 #undef ELF_GNU_PROPERTY_ALIGN 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 #define ELF_GNU_PROPERTY_ALIGN ELF32_GNU_PROPERTY_ALIGN 40 41 /* 42 * Some data types as stored in coredump. 43 */ 44 #define user_long_t compat_long_t 45 #define user_siginfo_t compat_siginfo_t 46 #define copy_siginfo_to_external copy_siginfo_to_external32 47 48 /* 49 * The machine-dependent core note format types are defined in elfcore-compat.h, 50 * which requires asm/elf.h to define compat_elf_gregset_t et al. 51 */ 52 #define elf_prstatus compat_elf_prstatus 53 #define elf_prpsinfo compat_elf_prpsinfo 54 55 #undef ns_to_kernel_old_timeval 56 #define ns_to_kernel_old_timeval ns_to_old_timeval32 57 58 /* 59 * To use this file, asm/elf.h must define compat_elf_check_arch. 60 * The other following macros can be defined if the compat versions 61 * differ from the native ones, or omitted when they match. 62 */ 63 64 #undef ELF_ARCH 65 #undef elf_check_arch 66 #define elf_check_arch compat_elf_check_arch 67 68 #ifdef COMPAT_ELF_PLATFORM 69 #undef ELF_PLATFORM 70 #define ELF_PLATFORM COMPAT_ELF_PLATFORM 71 #endif 72 73 #ifdef COMPAT_ELF_HWCAP 74 #undef ELF_HWCAP 75 #define ELF_HWCAP COMPAT_ELF_HWCAP 76 #endif 77 78 #ifdef COMPAT_ELF_HWCAP2 79 #undef ELF_HWCAP2 80 #define ELF_HWCAP2 COMPAT_ELF_HWCAP2 81 #endif 82 83 #ifdef COMPAT_ARCH_DLINFO 84 #undef ARCH_DLINFO 85 #define ARCH_DLINFO COMPAT_ARCH_DLINFO 86 #endif 87 88 #ifdef COMPAT_ELF_ET_DYN_BASE 89 #undef ELF_ET_DYN_BASE 90 #define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE 91 #endif 92 93 #ifdef COMPAT_ELF_EXEC_PAGESIZE 94 #undef ELF_EXEC_PAGESIZE 95 #define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE 96 #endif 97 98 #ifdef COMPAT_ELF_PLAT_INIT 99 #undef ELF_PLAT_INIT 100 #define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT 101 #endif 102 103 #ifdef COMPAT_SET_PERSONALITY 104 #undef SET_PERSONALITY 105 #define SET_PERSONALITY COMPAT_SET_PERSONALITY 106 #endif 107 108 #ifdef compat_start_thread 109 #define COMPAT_START_THREAD(ex, regs, new_ip, new_sp) \ 110 compat_start_thread(regs, new_ip, new_sp) 111 #endif 112 113 #ifdef COMPAT_START_THREAD 114 #undef START_THREAD 115 #define START_THREAD COMPAT_START_THREAD 116 #endif 117 118 #ifdef compat_arch_setup_additional_pages 119 #define COMPAT_ARCH_SETUP_ADDITIONAL_PAGES(bprm, ex, interpreter) \ 120 compat_arch_setup_additional_pages(bprm, interpreter) 121 #endif 122 123 #ifdef COMPAT_ARCH_SETUP_ADDITIONAL_PAGES 124 #undef ARCH_HAS_SETUP_ADDITIONAL_PAGES 125 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 126 #undef ARCH_SETUP_ADDITIONAL_PAGES 127 #define ARCH_SETUP_ADDITIONAL_PAGES COMPAT_ARCH_SETUP_ADDITIONAL_PAGES 128 #endif 129 130 #ifdef compat_elf_read_implies_exec 131 #undef elf_read_implies_exec 132 #define elf_read_implies_exec compat_elf_read_implies_exec 133 #endif 134 135 /* 136 * Rename a few of the symbols that binfmt_elf.c will define. 137 * These are all local so the names don't really matter, but it 138 * might make some debugging less confusing not to duplicate them. 139 */ 140 #define elf_format compat_elf_format 141 #define init_elf_binfmt init_compat_elf_binfmt 142 #define exit_elf_binfmt exit_compat_elf_binfmt 143 144 /* 145 * We share all the actual code with the native (64-bit) version. 146 */ 147 #include "binfmt_elf.c" 148