| Roland McGrath | 2f79e48 | 2008-01-30 13:31:46 +0100 | [diff] [blame] | 1 | /* |
| 2 | * 32-bit compatibility support for ELF format executables and core dumps. |
| 3 | * |
| 4 | * Copyright (C) 2007 Red Hat, Inc. All rights reserved. |
| 5 | * |
| 6 | * This copyrighted material is made available to anyone wishing to use, |
| 7 | * modify, copy, or redistribute it subject to the terms and conditions |
| 8 | * of the GNU General Public License v.2. |
| 9 | * |
| 10 | * Red Hat Author: Roland McGrath. |
| 11 | * |
| 12 | * This file is used in a 64-bit kernel that wants to support 32-bit ELF. |
| 13 | * asm/elf.h is responsible for defining the compat_* and COMPAT_* macros |
| 14 | * used below, with definitions appropriate for 32-bit ABI compatibility. |
| 15 | * |
| 16 | * We use macros to rename the ABI types and machine-dependent |
| 17 | * functions used in binfmt_elf.c to compat versions. |
| 18 | */ |
| 19 | |
| 20 | #include <linux/elfcore-compat.h> |
| 21 | #include <linux/time.h> |
| 22 | |
| 23 | /* |
| 24 | * Rename the basic ELF layout types to refer to the 32-bit class of files. |
| 25 | */ |
| 26 | #undef ELF_CLASS |
| 27 | #define ELF_CLASS ELFCLASS32 |
| 28 | |
| 29 | #undef elfhdr |
| 30 | #undef elf_phdr |
| 31 | #undef elf_note |
| 32 | #undef elf_addr_t |
| 33 | #define elfhdr elf32_hdr |
| 34 | #define elf_phdr elf32_phdr |
| 35 | #define elf_note elf32_note |
| 36 | #define elf_addr_t Elf32_Addr |
| 37 | |
| 38 | /* |
| 39 | * The machine-dependent core note format types are defined in elfcore-compat.h, |
| 40 | * which requires asm/elf.h to define compat_elf_gregset_t et al. |
| 41 | */ |
| 42 | #define elf_prstatus compat_elf_prstatus |
| 43 | #define elf_prpsinfo compat_elf_prpsinfo |
| 44 | |
| 45 | /* |
| 46 | * Compat version of cputime_to_compat_timeval, perhaps this |
| 47 | * should be an inline in <linux/compat.h>. |
| 48 | */ |
| 49 | static void cputime_to_compat_timeval(const cputime_t cputime, |
| 50 | struct compat_timeval *value) |
| 51 | { |
| 52 | struct timeval tv; |
| 53 | cputime_to_timeval(cputime, &tv); |
| 54 | value->tv_sec = tv.tv_sec; |
| 55 | value->tv_usec = tv.tv_usec; |
| 56 | } |
| 57 | |
| 58 | #undef cputime_to_timeval |
| 59 | #define cputime_to_timeval cputime_to_compat_timeval |
| 60 | |
| 61 | |
| 62 | /* |
| 63 | * To use this file, asm/elf.h must define compat_elf_check_arch. |
| 64 | * The other following macros can be defined if the compat versions |
| 65 | * differ from the native ones, or omitted when they match. |
| 66 | */ |
| 67 | |
| 68 | #undef ELF_ARCH |
| 69 | #undef elf_check_arch |
| 70 | #define elf_check_arch compat_elf_check_arch |
| 71 | |
| 72 | #ifdef COMPAT_ELF_PLATFORM |
| 73 | #undef ELF_PLATFORM |
| 74 | #define ELF_PLATFORM COMPAT_ELF_PLATFORM |
| 75 | #endif |
| 76 | |
| 77 | #ifdef COMPAT_ELF_HWCAP |
| 78 | #undef ELF_HWCAP |
| 79 | #define ELF_HWCAP COMPAT_ELF_HWCAP |
| 80 | #endif |
| 81 | |
| 82 | #ifdef COMPAT_ARCH_DLINFO |
| 83 | #undef ARCH_DLINFO |
| 84 | #define ARCH_DLINFO COMPAT_ARCH_DLINFO |
| 85 | #endif |
| 86 | |
| 87 | #ifdef COMPAT_ELF_ET_DYN_BASE |
| 88 | #undef ELF_ET_DYN_BASE |
| 89 | #define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE |
| 90 | #endif |
| 91 | |
| 92 | #ifdef COMPAT_ELF_EXEC_PAGESIZE |
| 93 | #undef ELF_EXEC_PAGESIZE |
| 94 | #define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE |
| 95 | #endif |
| 96 | |
| 97 | #ifdef COMPAT_ELF_PLAT_INIT |
| 98 | #undef ELF_PLAT_INIT |
| 99 | #define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT |
| 100 | #endif |
| 101 | |
| 102 | #ifdef COMPAT_SET_PERSONALITY |
| 103 | #undef SET_PERSONALITY |
| 104 | #define SET_PERSONALITY COMPAT_SET_PERSONALITY |
| 105 | #endif |
| 106 | |
| 107 | #ifdef compat_start_thread |
| 108 | #undef start_thread |
| 109 | #define start_thread compat_start_thread |
| 110 | #endif |
| 111 | |
| 112 | #ifdef compat_arch_setup_additional_pages |
| 113 | #undef ARCH_HAS_SETUP_ADDITIONAL_PAGES |
| 114 | #define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1 |
| 115 | #undef arch_setup_additional_pages |
| 116 | #define arch_setup_additional_pages compat_arch_setup_additional_pages |
| 117 | #endif |
| 118 | |
| 119 | /* |
| 120 | * Rename a few of the symbols that binfmt_elf.c will define. |
| 121 | * These are all local so the names don't really matter, but it |
| 122 | * might make some debugging less confusing not to duplicate them. |
| 123 | */ |
| 124 | #define elf_format compat_elf_format |
| 125 | #define init_elf_binfmt init_compat_elf_binfmt |
| 126 | #define exit_elf_binfmt exit_compat_elf_binfmt |
| 127 | |
| 128 | /* |
| 129 | * We share all the actual code with the native (64-bit) version. |
| 130 | */ |
| 131 | #include "binfmt_elf.c" |