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