| 1 | |
| 2 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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_ELF_HWCAP3
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| 84 | #undef ELF_HWCAP3
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| 85 | #define ELF_HWCAP3 COMPAT_ELF_HWCAP3
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| 86 | #endif
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| 87 |
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| 88 | #ifdef COMPAT_ELF_HWCAP4
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| 89 | #undef ELF_HWCAP4
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| 90 | #define ELF_HWCAP4 COMPAT_ELF_HWCAP4
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| 91 | #endif
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| 92 |
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| 93 | #ifdef COMPAT_ARCH_DLINFO
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| 94 | #undef ARCH_DLINFO
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| 95 | #define ARCH_DLINFO COMPAT_ARCH_DLINFO
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| 96 | #endif
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| 97 |
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| 98 | #ifdef COMPAT_ELF_ET_DYN_BASE
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| 99 | #undef ELF_ET_DYN_BASE
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| 100 | #define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE
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| 101 | #endif
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| 102 |
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| 103 | #ifdef COMPAT_ELF_PLAT_INIT
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| 104 | #undef ELF_PLAT_INIT
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| 105 | #define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT
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| 106 | #endif
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| 107 |
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| 108 | #ifdef COMPAT_SET_PERSONALITY
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| 109 | #undef SET_PERSONALITY
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| 110 | #define SET_PERSONALITY COMPAT_SET_PERSONALITY
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| 111 | #endif
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| 112 |
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| 113 | #ifdef compat_start_thread
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| 114 | #define COMPAT_START_THREAD(ex, regs, new_ip, new_sp) \
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| 115 | compat_start_thread(regs, new_ip, new_sp)
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| 116 | #endif
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| 117 |
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| 118 | #ifdef COMPAT_START_THREAD
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| 119 | #undef START_THREAD
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| 120 | #define START_THREAD COMPAT_START_THREAD
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| 121 | #endif
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| 122 |
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| 123 | #ifdef compat_arch_setup_additional_pages
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| 124 | #define COMPAT_ARCH_SETUP_ADDITIONAL_PAGES(bprm, ex, interpreter) \
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| 125 | compat_arch_setup_additional_pages(bprm, interpreter)
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| 126 | #endif
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| 127 |
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| 128 | #ifdef COMPAT_ARCH_SETUP_ADDITIONAL_PAGES
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| 129 | #undef ARCH_HAS_SETUP_ADDITIONAL_PAGES
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| 130 | #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
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| 131 | #undef ARCH_SETUP_ADDITIONAL_PAGES
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| 132 | #define ARCH_SETUP_ADDITIONAL_PAGES COMPAT_ARCH_SETUP_ADDITIONAL_PAGES
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| 133 | #endif
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| 134 |
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| 135 | #ifdef compat_elf_read_implies_exec
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| 136 | #undef elf_read_implies_exec
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| 137 | #define elf_read_implies_exec compat_elf_read_implies_exec
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| 138 | #endif
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| 139 |
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| 140 | |
| 141 | * Rename a few of the symbols that binfmt_elf.c will define.
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| 142 | * These are all local so the names don't really matter, but it
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| 143 | * might make some debugging less confusing not to duplicate them.
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| 144 |
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| 145 | #define elf_format compat_elf_format
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| 146 | #define init_elf_binfmt init_compat_elf_binfmt
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| 147 | #define exit_elf_binfmt exit_compat_elf_binfmt
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| 148 | #define binfmt_elf_test_cases compat_binfmt_elf_test_cases
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| 149 | #define binfmt_elf_test_suite compat_binfmt_elf_test_suite
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| 150 |
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| 151 | |
| 152 | * We share all the actual code with the native (64-bit) version.
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| 153 |
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| 154 | #include "binfmt_elf.c"
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