linux/fs/compat_binfmt_elf.c
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   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_shdr
  32#undef  elf_note
  33#undef  elf_addr_t
  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
  40/*
  41 * Some data types as stored in coredump.
  42 */
  43#define user_long_t             compat_long_t
  44#define user_siginfo_t          compat_siginfo_t
  45#define copy_siginfo_to_user    copy_siginfo_to_user32
  46
  47/*
  48 * The machine-dependent core note format types are defined in elfcore-compat.h,
  49 * which requires asm/elf.h to define compat_elf_gregset_t et al.
  50 */
  51#define elf_prstatus    compat_elf_prstatus
  52#define elf_prpsinfo    compat_elf_prpsinfo
  53
  54/*
  55 * Compat version of cputime_to_compat_timeval, perhaps this
  56 * should be an inline in <linux/compat.h>.
  57 */
  58static void cputime_to_compat_timeval(const cputime_t cputime,
  59                                      struct compat_timeval *value)
  60{
  61        struct timeval tv;
  62        cputime_to_timeval(cputime, &tv);
  63        value->tv_sec = tv.tv_sec;
  64        value->tv_usec = tv.tv_usec;
  65}
  66
  67#undef cputime_to_timeval
  68#define cputime_to_timeval cputime_to_compat_timeval
  69
  70
  71/*
  72 * To use this file, asm/elf.h must define compat_elf_check_arch.
  73 * The other following macros can be defined if the compat versions
  74 * differ from the native ones, or omitted when they match.
  75 */
  76
  77#undef  ELF_ARCH
  78#undef  elf_check_arch
  79#define elf_check_arch  compat_elf_check_arch
  80
  81#ifdef  COMPAT_ELF_PLATFORM
  82#undef  ELF_PLATFORM
  83#define ELF_PLATFORM            COMPAT_ELF_PLATFORM
  84#endif
  85
  86#ifdef  COMPAT_ELF_HWCAP
  87#undef  ELF_HWCAP
  88#define ELF_HWCAP               COMPAT_ELF_HWCAP
  89#endif
  90
  91#ifdef  COMPAT_ARCH_DLINFO
  92#undef  ARCH_DLINFO
  93#define ARCH_DLINFO             COMPAT_ARCH_DLINFO
  94#endif
  95
  96#ifdef  COMPAT_ELF_ET_DYN_BASE
  97#undef  ELF_ET_DYN_BASE
  98#define ELF_ET_DYN_BASE         COMPAT_ELF_ET_DYN_BASE
  99#endif
 100
 101#ifdef COMPAT_ELF_EXEC_PAGESIZE
 102#undef  ELF_EXEC_PAGESIZE
 103#define ELF_EXEC_PAGESIZE       COMPAT_ELF_EXEC_PAGESIZE
 104#endif
 105
 106#ifdef  COMPAT_ELF_PLAT_INIT
 107#undef  ELF_PLAT_INIT
 108#define ELF_PLAT_INIT           COMPAT_ELF_PLAT_INIT
 109#endif
 110
 111#ifdef  COMPAT_SET_PERSONALITY
 112#undef  SET_PERSONALITY
 113#define SET_PERSONALITY         COMPAT_SET_PERSONALITY
 114#endif
 115
 116#ifdef  compat_start_thread
 117#undef  start_thread
 118#define start_thread            compat_start_thread
 119#endif
 120
 121#ifdef  compat_arch_setup_additional_pages
 122#undef  ARCH_HAS_SETUP_ADDITIONAL_PAGES
 123#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 124#undef  arch_setup_additional_pages
 125#define arch_setup_additional_pages compat_arch_setup_additional_pages
 126#endif
 127
 128/*
 129 * Rename a few of the symbols that binfmt_elf.c will define.
 130 * These are all local so the names don't really matter, but it
 131 * might make some debugging less confusing not to duplicate them.
 132 */
 133#define elf_format              compat_elf_format
 134#define init_elf_binfmt         init_compat_elf_binfmt
 135#define exit_elf_binfmt         exit_compat_elf_binfmt
 136
 137/*
 138 * We share all the actual code with the native (64-bit) version.
 139 */
 140#include "binfmt_elf.c"
 141
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