x86: compat_binfmt_elf

/*

 * 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_note

#undef	elf_addr_t

#define elfhdr		elf32_hdr

#define elf_phdr	elf32_phdr

#define elf_note	elf32_note

#define elf_addr_t	Elf32_Addr

/*

 * 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"