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