| 1 | // SPDX-License-Identifier: GPL-2.0-only |
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| 2 | /* |
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| 3 | * 32-bit compatibility support for ELF format executables and core dumps. |
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| 4 | * |
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| 5 | * Copyright (C) 2007 Red Hat, Inc. All rights reserved. |
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| 6 | * |
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| 7 | * Red Hat Author: Roland McGrath. |
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| 8 | * |
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| 9 | * This file is used in a 64-bit kernel that wants to support 32-bit ELF. |
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| 10 | * asm/elf.h is responsible for defining the compat_* and COMPAT_* macros |
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| 11 | * used below, with definitions appropriate for 32-bit ABI compatibility. |
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| 12 | * |
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| 13 | * We use macros to rename the ABI types and machine-dependent |
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| 14 | * functions used in binfmt_elf.c to compat versions. |
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| 15 | */ |
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| 16 | |
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| 17 | #include <linux/elfcore-compat.h> |
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| 18 | #include <linux/time.h> |
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| 19 | |
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| 20 | #define ELF_COMPAT 1 |
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| 21 | |
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| 22 | /* |
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| 23 | * Rename the basic ELF layout types to refer to the 32-bit class of files. |
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| 24 | */ |
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| 25 | #undef ELF_CLASS |
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| 26 | #define ELF_CLASS ELFCLASS32 |
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| 27 | |
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| 28 | #undef elfhdr |
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| 29 | #undef elf_phdr |
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| 30 | #undef elf_shdr |
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| 31 | #undef elf_note |
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| 32 | #undef elf_addr_t |
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| 33 | #undef ELF_GNU_PROPERTY_ALIGN |
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| 34 | #define elfhdr elf32_hdr |
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| 35 | #define elf_phdr elf32_phdr |
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| 36 | #define elf_shdr elf32_shdr |
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| 37 | #define elf_note elf32_note |
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| 38 | #define elf_addr_t Elf32_Addr |
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| 39 | #define ELF_GNU_PROPERTY_ALIGN ELF32_GNU_PROPERTY_ALIGN |
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| 40 | |
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| 41 | /* |
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| 42 | * Some data types as stored in coredump. |
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| 43 | */ |
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| 44 | #define user_long_t compat_long_t |
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| 45 | #define user_siginfo_t compat_siginfo_t |
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| 46 | #define copy_siginfo_to_external copy_siginfo_to_external32 |
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| 47 | |
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| 48 | /* |
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| 49 | * The machine-dependent core note format types are defined in elfcore-compat.h, |
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| 50 | * which requires asm/elf.h to define compat_elf_gregset_t et al. |
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| 51 | */ |
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| 52 | #define elf_prstatus compat_elf_prstatus |
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| 53 | #define elf_prstatus_common compat_elf_prstatus_common |
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| 54 | #define elf_prpsinfo compat_elf_prpsinfo |
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| 55 | |
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| 56 | #undef ns_to_kernel_old_timeval |
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| 57 | #define ns_to_kernel_old_timeval ns_to_old_timeval32 |
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| 58 | |
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| 59 | /* |
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| 60 | * To use this file, asm/elf.h must define compat_elf_check_arch. |
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| 61 | * The other following macros can be defined if the compat versions |
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| 62 | * differ from the native ones, or omitted when they match. |
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| 63 | */ |
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| 64 | |
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| 65 | #undef elf_check_arch |
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| 66 | #define elf_check_arch compat_elf_check_arch |
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| 67 | |
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| 68 | #ifdef COMPAT_ELF_PLATFORM |
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| 69 | #undef ELF_PLATFORM |
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| 70 | #define ELF_PLATFORM COMPAT_ELF_PLATFORM |
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| 71 | #endif |
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| 72 | |
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| 73 | #ifdef COMPAT_ELF_HWCAP |
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| 74 | #undef ELF_HWCAP |
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| 75 | #define ELF_HWCAP COMPAT_ELF_HWCAP |
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| 76 | #endif |
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| 77 | |
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| 78 | #ifdef COMPAT_ELF_HWCAP2 |
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| 79 | #undef ELF_HWCAP2 |
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| 80 | #define ELF_HWCAP2 COMPAT_ELF_HWCAP2 |
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| 81 | #endif |
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| 82 | |
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| 83 | #ifdef COMPAT_ARCH_DLINFO |
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| 84 | #undef ARCH_DLINFO |
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| 85 | #define ARCH_DLINFO COMPAT_ARCH_DLINFO |
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| 86 | #endif |
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| 87 | |
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| 88 | #ifdef COMPAT_ELF_ET_DYN_BASE |
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| 89 | #undef ELF_ET_DYN_BASE |
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| 90 | #define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE |
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| 91 | #endif |
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| 92 | |
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| 93 | #ifdef COMPAT_ELF_PLAT_INIT |
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| 94 | #undef ELF_PLAT_INIT |
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| 95 | #define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT |
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| 96 | #endif |
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| 97 | |
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| 98 | #ifdef COMPAT_SET_PERSONALITY |
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| 99 | #undef SET_PERSONALITY |
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| 100 | #define SET_PERSONALITY COMPAT_SET_PERSONALITY |
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| 101 | #endif |
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| 102 | |
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| 103 | #ifdef compat_start_thread |
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| 104 | #define COMPAT_START_THREAD(ex, regs, new_ip, new_sp) \ |
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| 105 | compat_start_thread(regs, new_ip, new_sp) |
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| 106 | #endif |
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| 107 | |
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| 108 | #ifdef COMPAT_START_THREAD |
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| 109 | #undef START_THREAD |
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| 110 | #define START_THREAD COMPAT_START_THREAD |
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| 111 | #endif |
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| 112 | |
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| 113 | #ifdef compat_arch_setup_additional_pages |
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| 114 | #define COMPAT_ARCH_SETUP_ADDITIONAL_PAGES(bprm, ex, interpreter) \ |
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| 115 | compat_arch_setup_additional_pages(bprm, interpreter) |
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| 116 | #endif |
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| 117 | |
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| 118 | #ifdef COMPAT_ARCH_SETUP_ADDITIONAL_PAGES |
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| 119 | #undef ARCH_HAS_SETUP_ADDITIONAL_PAGES |
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| 120 | #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 |
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| 121 | #undef ARCH_SETUP_ADDITIONAL_PAGES |
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| 122 | #define ARCH_SETUP_ADDITIONAL_PAGES COMPAT_ARCH_SETUP_ADDITIONAL_PAGES |
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| 123 | #endif |
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| 124 | |
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| 125 | #ifdef compat_elf_read_implies_exec |
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| 126 | #undef elf_read_implies_exec |
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| 127 | #define elf_read_implies_exec compat_elf_read_implies_exec |
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| 128 | #endif |
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| 129 | |
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| 130 | /* |
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| 131 | * Rename a few of the symbols that binfmt_elf.c will define. |
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| 132 | * These are all local so the names don't really matter, but it |
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| 133 | * might make some debugging less confusing not to duplicate them. |
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| 134 | */ |
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| 135 | #define elf_format compat_elf_format |
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| 136 | #define init_elf_binfmt init_compat_elf_binfmt |
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| 137 | #define exit_elf_binfmt exit_compat_elf_binfmt |
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| 138 | #define binfmt_elf_test_cases compat_binfmt_elf_test_cases |
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| 139 | #define binfmt_elf_test_suite compat_binfmt_elf_test_suite |
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| 140 | |
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| 141 | /* |
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| 142 | * We share all the actual code with the native (64-bit) version. |
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| 143 | */ |
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| 144 | #include "binfmt_elf.c" |
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| 145 | |
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