compat_binfmt_elf.c

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/*
 * 32-bit compatibility support for ELF format executables and core dumps.
 *
 * Copyright (C) 2007 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License v.2.
 *
 * Red Hat Author: Roland McGrath.
 *
 * This file is used in a 64-bit kernel that wants to support 32-bit ELF.
 * asm/elf.h is responsible for defining the compat_* and COMPAT_* macros
 * used below, with definitions appropriate for 32-bit ABI compatibility.
 *
 * We use macros to rename the ABI types and machine-dependent
 * functions used in binfmt_elf.c to compat versions.
 */

#include <linux/elfcore-compat.h>
#include <linux/time.h>

/*
 * Rename the basic ELF layout types to refer to the 32-bit class of files.
 */
#undef  ELF_CLASS
#define ELF_CLASS   ELFCLASS32

#undef  elfhdr
#undef  elf_phdr
#undef  elf_shdr
#undef  elf_note
#undef  elf_addr_t
#define elfhdr      elf32_hdr
#define elf_phdr    elf32_phdr
#define elf_shdr    elf32_shdr
#define elf_note    elf32_note
#define elf_addr_t  Elf32_Addr

/*
 * Some data types as stored in coredump.
 */
#define user_long_t     compat_long_t
#define user_siginfo_t      compat_siginfo_t
#define copy_siginfo_to_user    copy_siginfo_to_user32

/*
 * The machine-dependent core note format types are defined in elfcore-compat.h,
 * which requires asm/elf.h to define compat_elf_gregset_t et al.
 */
#define elf_prstatus    compat_elf_prstatus
#define elf_prpsinfo    compat_elf_prpsinfo

/*
 * Compat version of cputime_to_compat_timeval, perhaps this
 * should be an inline in <linux/compat.h>.
 */
static void cputime_to_compat_timeval(const cputime_t cputime,
                      struct compat_timeval *value)
{
    struct timeval tv;
    cputime_to_timeval(cputime, &tv);
    value->tv_sec = tv.tv_sec;
    value->tv_usec = tv.tv_usec;
}

#undef cputime_to_timeval
#define cputime_to_timeval cputime_to_compat_timeval


/*
 * To use this file, asm/elf.h must define compat_elf_check_arch.
 * The other following macros can be defined if the compat versions
 * differ from the native ones, or omitted when they match.
 */

#undef  ELF_ARCH
#undef  elf_check_arch
#define elf_check_arch  compat_elf_check_arch

#ifdef  COMPAT_ELF_PLATFORM
#undef  ELF_PLATFORM
#define ELF_PLATFORM        COMPAT_ELF_PLATFORM
#endif

#ifdef  COMPAT_ELF_HWCAP
#undef  ELF_HWCAP
#define ELF_HWCAP       COMPAT_ELF_HWCAP
#endif

#ifdef  COMPAT_ARCH_DLINFO
#undef  ARCH_DLINFO
#define ARCH_DLINFO     COMPAT_ARCH_DLINFO
#endif

#ifdef  COMPAT_ELF_ET_DYN_BASE
#undef  ELF_ET_DYN_BASE
#define ELF_ET_DYN_BASE     COMPAT_ELF_ET_DYN_BASE
#endif

#ifdef COMPAT_ELF_EXEC_PAGESIZE
#undef  ELF_EXEC_PAGESIZE
#define ELF_EXEC_PAGESIZE   COMPAT_ELF_EXEC_PAGESIZE
#endif

#ifdef  COMPAT_ELF_PLAT_INIT
#undef  ELF_PLAT_INIT
#define ELF_PLAT_INIT       COMPAT_ELF_PLAT_INIT
#endif

#ifdef  COMPAT_SET_PERSONALITY
#undef  SET_PERSONALITY
#define SET_PERSONALITY     COMPAT_SET_PERSONALITY
#endif

#ifdef  compat_start_thread
#undef  start_thread
#define start_thread        compat_start_thread
#endif

#ifdef  compat_arch_setup_additional_pages
#undef  ARCH_HAS_SETUP_ADDITIONAL_PAGES
#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
#undef  arch_setup_additional_pages
#define arch_setup_additional_pages compat_arch_setup_additional_pages
#endif

/*
 * Rename a few of the symbols that binfmt_elf.c will define.
 * These are all local so the names don't really matter, but it
 * might make some debugging less confusing not to duplicate them.
 */
#define elf_format      compat_elf_format
#define init_elf_binfmt     init_compat_elf_binfmt
#define exit_elf_binfmt     exit_compat_elf_binfmt

/*
 * We share all the actual code with the native (64-bit) version.
 */
#include "binfmt_elf.c"