/*
   * 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"