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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_ELF_HWCAP2
    #undef	ELF_HWCAP2
    #define	ELF_HWCAP2		COMPAT_ELF_HWCAP2
    #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"