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 /* 21 * Rename the basic ELF layout types to refer to the 32-bit class of files. 22 */ 23 #undef ELF_CLASS 24 #define ELF_CLASS ELFCLASS32 25 26 #undef elfhdr 27 #undef elf_phdr 28 #undef elf_shdr 29 #undef elf_note 30 #undef elf_addr_t 31 #define elfhdr elf32_hdr 32 #define elf_phdr elf32_phdr 33 #define elf_shdr elf32_shdr 34 #define elf_note elf32_note 35 #define elf_addr_t Elf32_Addr 36 37 /* 38 * Some data types as stored in coredump. 39 */ 40 #define user_long_t compat_long_t 41 #define user_siginfo_t compat_siginfo_t 42 #define copy_siginfo_to_user copy_siginfo_to_user32 43 44 /* 45 * The machine-dependent core note format types are defined in elfcore-compat.h, 46 * which requires asm/elf.h to define compat_elf_gregset_t et al. 47 */ 48 #define elf_prstatus compat_elf_prstatus 49 #define elf_prpsinfo compat_elf_prpsinfo 50 51 #undef ns_to_timeval 52 #define ns_to_timeval ns_to_old_timeval32 53 54 /* 55 * To use this file, asm/elf.h must define compat_elf_check_arch. 56 * The other following macros can be defined if the compat versions 57 * differ from the native ones, or omitted when they match. 58 */ 59 60 #undef ELF_ARCH 61 #undef elf_check_arch 62 #define elf_check_arch compat_elf_check_arch 63 64 #ifdef COMPAT_ELF_PLATFORM 65 #undef ELF_PLATFORM 66 #define ELF_PLATFORM COMPAT_ELF_PLATFORM 67 #endif 68 69 #ifdef COMPAT_ELF_HWCAP 70 #undef ELF_HWCAP 71 #define ELF_HWCAP COMPAT_ELF_HWCAP 72 #endif 73 74 #ifdef COMPAT_ELF_HWCAP2 75 #undef ELF_HWCAP2 76 #define ELF_HWCAP2 COMPAT_ELF_HWCAP2 77 #endif 78 79 #ifdef COMPAT_ARCH_DLINFO 80 #undef ARCH_DLINFO 81 #define ARCH_DLINFO COMPAT_ARCH_DLINFO 82 #endif 83 84 #ifdef COMPAT_ELF_ET_DYN_BASE 85 #undef ELF_ET_DYN_BASE 86 #define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE 87 #endif 88 89 #ifdef COMPAT_ELF_EXEC_PAGESIZE 90 #undef ELF_EXEC_PAGESIZE 91 #define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE 92 #endif 93 94 #ifdef COMPAT_ELF_PLAT_INIT 95 #undef ELF_PLAT_INIT 96 #define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT 97 #endif 98 99 #ifdef COMPAT_SET_PERSONALITY 100 #undef SET_PERSONALITY 101 #define SET_PERSONALITY COMPAT_SET_PERSONALITY 102 #endif 103 104 #ifdef compat_start_thread 105 #undef start_thread 106 #define start_thread compat_start_thread 107 #endif 108 109 #ifdef compat_arch_setup_additional_pages 110 #undef ARCH_HAS_SETUP_ADDITIONAL_PAGES 111 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 112 #undef arch_setup_additional_pages 113 #define arch_setup_additional_pages compat_arch_setup_additional_pages 114 #endif 115 116 /* 117 * Rename a few of the symbols that binfmt_elf.c will define. 118 * These are all local so the names don't really matter, but it 119 * might make some debugging less confusing not to duplicate them. 120 */ 121 #define elf_format compat_elf_format 122 #define init_elf_binfmt init_compat_elf_binfmt 123 #define exit_elf_binfmt exit_compat_elf_binfmt 124 125 /* 126 * We share all the actual code with the native (64-bit) version. 127 */ 128 #include "binfmt_elf.c" 129
