linux/fs/compat_binfmt_elf.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * 32-bit compatibility support for ELF format executables and core dumps.
   4 *
   5 * Copyright (C) 2007 Red Hat, Inc.  All rights reserved.
   6 *
   7 * Red Hat Author: Roland McGrath.
   8 *
   9 * This file is used in a 64-bit kernel that wants to support 32-bit ELF.
  10 * asm/elf.h is responsible for defining the compat_* and COMPAT_* macros
  11 * used below, with definitions appropriate for 32-bit ABI compatibility.
  12 *
  13 * We use macros to rename the ABI types and machine-dependent
  14 * functions used in binfmt_elf.c to compat versions.
  15 */
  16
  17#include <linux/elfcore-compat.h>
  18#include <linux/time.h>
  19
  20#define ELF_COMPAT      1
  21
  22/*
  23 * Rename the basic ELF layout types to refer to the 32-bit class of files.
  24 */
  25#undef  ELF_CLASS
  26#define ELF_CLASS       ELFCLASS32
  27
  28#undef  elfhdr
  29#undef  elf_phdr
  30#undef  elf_shdr
  31#undef  elf_note
  32#undef  elf_addr_t
  33#undef  ELF_GNU_PROPERTY_ALIGN
  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#define ELF_GNU_PROPERTY_ALIGN  ELF32_GNU_PROPERTY_ALIGN
  40
  41/*
  42 * Some data types as stored in coredump.
  43 */
  44#define user_long_t             compat_long_t
  45#define user_siginfo_t          compat_siginfo_t
  46#define copy_siginfo_to_external        copy_siginfo_to_external32
  47
  48/*
  49 * The machine-dependent core note format types are defined in elfcore-compat.h,
  50 * which requires asm/elf.h to define compat_elf_gregset_t et al.
  51 */
  52#define elf_prstatus    compat_elf_prstatus
  53#define elf_prstatus_common     compat_elf_prstatus_common
  54#define elf_prpsinfo    compat_elf_prpsinfo
  55
  56#undef ns_to_kernel_old_timeval
  57#define ns_to_kernel_old_timeval ns_to_old_timeval32
  58
  59/*
  60 * To use this file, asm/elf.h must define compat_elf_check_arch.
  61 * The other following macros can be defined if the compat versions
  62 * differ from the native ones, or omitted when they match.
  63 */
  64
  65#undef  elf_check_arch
  66#define elf_check_arch  compat_elf_check_arch
  67
  68#ifdef  COMPAT_ELF_PLATFORM
  69#undef  ELF_PLATFORM
  70#define ELF_PLATFORM            COMPAT_ELF_PLATFORM
  71#endif
  72
  73#ifdef  COMPAT_ELF_HWCAP
  74#undef  ELF_HWCAP
  75#define ELF_HWCAP               COMPAT_ELF_HWCAP
  76#endif
  77
  78#ifdef  COMPAT_ELF_HWCAP2
  79#undef  ELF_HWCAP2
  80#define ELF_HWCAP2              COMPAT_ELF_HWCAP2
  81#endif
  82
  83#ifdef  COMPAT_ARCH_DLINFO
  84#undef  ARCH_DLINFO
  85#define ARCH_DLINFO             COMPAT_ARCH_DLINFO
  86#endif
  87
  88#ifdef  COMPAT_ELF_ET_DYN_BASE
  89#undef  ELF_ET_DYN_BASE
  90#define ELF_ET_DYN_BASE         COMPAT_ELF_ET_DYN_BASE
  91#endif
  92
  93#ifdef  COMPAT_ELF_PLAT_INIT
  94#undef  ELF_PLAT_INIT
  95#define ELF_PLAT_INIT           COMPAT_ELF_PLAT_INIT
  96#endif
  97
  98#ifdef  COMPAT_SET_PERSONALITY
  99#undef  SET_PERSONALITY
 100#define SET_PERSONALITY         COMPAT_SET_PERSONALITY
 101#endif
 102
 103#ifdef  compat_start_thread
 104#define COMPAT_START_THREAD(ex, regs, new_ip, new_sp)   \
 105        compat_start_thread(regs, new_ip, new_sp)
 106#endif
 107
 108#ifdef  COMPAT_START_THREAD
 109#undef  START_THREAD
 110#define START_THREAD            COMPAT_START_THREAD
 111#endif
 112
 113#ifdef compat_arch_setup_additional_pages
 114#define COMPAT_ARCH_SETUP_ADDITIONAL_PAGES(bprm, ex, interpreter) \
 115        compat_arch_setup_additional_pages(bprm, interpreter)
 116#endif
 117
 118#ifdef  COMPAT_ARCH_SETUP_ADDITIONAL_PAGES
 119#undef  ARCH_HAS_SETUP_ADDITIONAL_PAGES
 120#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
 121#undef  ARCH_SETUP_ADDITIONAL_PAGES
 122#define ARCH_SETUP_ADDITIONAL_PAGES COMPAT_ARCH_SETUP_ADDITIONAL_PAGES
 123#endif
 124
 125#ifdef  compat_elf_read_implies_exec
 126#undef  elf_read_implies_exec
 127#define elf_read_implies_exec compat_elf_read_implies_exec
 128#endif
 129
 130/*
 131 * Rename a few of the symbols that binfmt_elf.c will define.
 132 * These are all local so the names don't really matter, but it
 133 * might make some debugging less confusing not to duplicate them.
 134 */
 135#define elf_format              compat_elf_format
 136#define init_elf_binfmt         init_compat_elf_binfmt
 137#define exit_elf_binfmt         exit_compat_elf_binfmt
 138
 139/*
 140 * We share all the actual code with the native (64-bit) version.
 141 */
 142#include "binfmt_elf.c"
 143
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.