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_prstatus_common compat_elf_prstatus_common 54#define elf_prpsinfo compat_elf_prpsinfo 55 56#undef ns_to_kernel_old_timeval 57#define ns_to_kernel_old_timeval ns_to_old_timeval32 58 59/* 60 * To use this file, asm/elf.h must define compat_elf_check_arch. 61 * The other following macros can be defined if the compat versions 62 * differ from the native ones, or omitted when they match. 63 */ 64 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_PLAT_INIT 94#undef ELF_PLAT_INIT 95#define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT 96#endif 97 98#ifdef COMPAT_SET_PERSONALITY 99#undef SET_PERSONALITY 100#define SET_PERSONALITY COMPAT_SET_PERSONALITY 101#endif 102 103#ifdef compat_start_thread 104#define COMPAT_START_THREAD(ex, regs, new_ip, new_sp) \ 105 compat_start_thread(regs, new_ip, new_sp) 106#endif 107 108#ifdef COMPAT_START_THREAD 109#undef START_THREAD 110#define START_THREAD COMPAT_START_THREAD 111#endif 112 113#ifdef compat_arch_setup_additional_pages 114#define COMPAT_ARCH_SETUP_ADDITIONAL_PAGES(bprm, ex, interpreter) \ 115 compat_arch_setup_additional_pages(bprm, interpreter) 116#endif 117 118#ifdef COMPAT_ARCH_SETUP_ADDITIONAL_PAGES 119#undef ARCH_HAS_SETUP_ADDITIONAL_PAGES 120#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 121#undef ARCH_SETUP_ADDITIONAL_PAGES 122#define ARCH_SETUP_ADDITIONAL_PAGES COMPAT_ARCH_SETUP_ADDITIONAL_PAGES 123#endif 124 125#ifdef compat_elf_read_implies_exec 126#undef elf_read_implies_exec 127#define elf_read_implies_exec compat_elf_read_implies_exec 128#endif 129 130/* 131 * Rename a few of the symbols that binfmt_elf.c will define. 132 * These are all local so the names don't really matter, but it 133 * might make some debugging less confusing not to duplicate them. 134 */ 135#define elf_format compat_elf_format 136#define init_elf_binfmt init_compat_elf_binfmt 137#define exit_elf_binfmt exit_compat_elf_binfmt 138 139/* 140 * We share all the actual code with the native (64-bit) version. 141 */ 142#include "binfmt_elf.c" 143