[net-next-2.6.git] / fs / compat_binfmt_elf.c

/*
 * 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

/*
 * 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"
Commit	Line	Data
2f79e48a RM	1	/*
	2	* 32-bit compatibility support for ELF format executables and core dumps.
	3	*
	4	* Copyright (C) 2007 Red Hat, Inc. All rights reserved.
	5	*
	6	* This copyrighted material is made available to anyone wishing to use,
	7	* modify, copy, or redistribute it subject to the terms and conditions
	8	* of the GNU General Public License v.2.
	9	*
	10	* Red Hat Author: Roland McGrath.
	11	*
	12	* This file is used in a 64-bit kernel that wants to support 32-bit ELF.
	13	* asm/elf.h is responsible for defining the compat_* and COMPAT_* macros
	14	* used below, with definitions appropriate for 32-bit ABI compatibility.
	15	*
	16	* We use macros to rename the ABI types and machine-dependent
	17	* functions used in binfmt_elf.c to compat versions.
	18	*/
	19
	20	#include <linux/elfcore-compat.h>
	21	#include <linux/time.h>
	22
	23	/*
	24	* Rename the basic ELF layout types to refer to the 32-bit class of files.
	25	*/
	26	#undef ELF_CLASS
	27	#define ELF_CLASS ELFCLASS32
	28
	29	#undef elfhdr
	30	#undef elf_phdr
1fcccbac	31	#undef elf_shdr
2f79e48a RM	32	#undef elf_note
	33	#undef elf_addr_t
	34	#define elfhdr elf32_hdr
	35	#define elf_phdr elf32_phdr
1fcccbac	36	#define elf_shdr elf32_shdr
2f79e48a RM	37	#define elf_note elf32_note
	38	#define elf_addr_t Elf32_Addr
	39
	40	/*
	41	* The machine-dependent core note format types are defined in elfcore-compat.h,
	42	* which requires asm/elf.h to define compat_elf_gregset_t et al.
	43	*/
	44	#define elf_prstatus compat_elf_prstatus
	45	#define elf_prpsinfo compat_elf_prpsinfo
	46
	47	/*
	48	* Compat version of cputime_to_compat_timeval, perhaps this
	49	* should be an inline in <linux/compat.h>.
	50	*/
	51	static void cputime_to_compat_timeval(const cputime_t cputime,
	52	struct compat_timeval *value)
	53	{
	54	struct timeval tv;
	55	cputime_to_timeval(cputime, &tv);
	56	value->tv_sec = tv.tv_sec;
	57	value->tv_usec = tv.tv_usec;
	58	}
	59
	60	#undef cputime_to_timeval
	61	#define cputime_to_timeval cputime_to_compat_timeval
	62
	63
	64	/*
	65	* To use this file, asm/elf.h must define compat_elf_check_arch.
	66	* The other following macros can be defined if the compat versions
	67	* differ from the native ones, or omitted when they match.
	68	*/
	69
	70	#undef ELF_ARCH
	71	#undef elf_check_arch
	72	#define elf_check_arch compat_elf_check_arch
	73
	74	#ifdef COMPAT_ELF_PLATFORM
	75	#undef ELF_PLATFORM
	76	#define ELF_PLATFORM COMPAT_ELF_PLATFORM
	77	#endif
	78
	79	#ifdef COMPAT_ELF_HWCAP
	80	#undef ELF_HWCAP
	81	#define ELF_HWCAP COMPAT_ELF_HWCAP
	82	#endif
	83
	84	#ifdef COMPAT_ARCH_DLINFO
	85	#undef ARCH_DLINFO
	86	#define ARCH_DLINFO COMPAT_ARCH_DLINFO
	87	#endif
	88
	89	#ifdef COMPAT_ELF_ET_DYN_BASE
	90	#undef ELF_ET_DYN_BASE
	91	#define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE
	92	#endif
	93
	94	#ifdef COMPAT_ELF_EXEC_PAGESIZE
	95	#undef ELF_EXEC_PAGESIZE
	96	#define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE
	97	#endif
	98
	99	#ifdef COMPAT_ELF_PLAT_INIT
	100	#undef ELF_PLAT_INIT
101	#define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT
102	#endif
103
104	#ifdef COMPAT_SET_PERSONALITY
105	#undef SET_PERSONALITY
106	#define SET_PERSONALITY COMPAT_SET_PERSONALITY
107	#endif
108
109	#ifdef compat_start_thread
110	#undef start_thread
111	#define start_thread compat_start_thread
112	#endif
113
114	#ifdef compat_arch_setup_additional_pages
115	#undef ARCH_HAS_SETUP_ADDITIONAL_PAGES
116	#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
117	#undef arch_setup_additional_pages
118	#define arch_setup_additional_pages compat_arch_setup_additional_pages
119	#endif
120
121	/*
122	* Rename a few of the symbols that binfmt_elf.c will define.
123	* These are all local so the names don't really matter, but it
124	* might make some debugging less confusing not to duplicate them.
125	*/
126	#define elf_format compat_elf_format
127	#define init_elf_binfmt init_compat_elf_binfmt
128	#define exit_elf_binfmt exit_compat_elf_binfmt
129
130	/*
131	* We share all the actual code with the native (64-bit) version.
132	*/
133	#include "binfmt_elf.c"