[linux-2.6-block.git] / fs / compat_binfmt_elf.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 32-bit compatibility support for ELF format executables and core dumps.
 *
 * Copyright (C) 2007 Red Hat, Inc.  All rights reserved.
 *
 * 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

#undef ns_to_timeval
#define ns_to_timeval ns_to_old_timeval32

/*
 * 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"
Commit	Line	Data
2522fe45	1	// SPDX-License-Identifier: GPL-2.0-only
2f79e48a RM	2	/*
	3	* 32-bit compatibility support for ELF format executables and core dumps.
	4	*
	5	* Copyright (C) 2007 Red Hat, Inc. All rights reserved.
	6	*
2f79e48a RM	7	* Red Hat Author: Roland McGrath.
	8	*
	9	* This file is used in a 64-bit kernel that wants to support 32-bit ELF.
	10	* asm/elf.h is responsible for defining the compat_* and COMPAT_* macros
	11	* used below, with definitions appropriate for 32-bit ABI compatibility.
	12	*
	13	* We use macros to rename the ABI types and machine-dependent
	14	* functions used in binfmt_elf.c to compat versions.
	15	*/
	16
	17	#include <linux/elfcore-compat.h>
	18	#include <linux/time.h>
	19
	20	/*
	21	* Rename the basic ELF layout types to refer to the 32-bit class of files.
	22	*/
	23	#undef ELF_CLASS
	24	#define ELF_CLASS ELFCLASS32
	25
	26	#undef elfhdr
	27	#undef elf_phdr
1fcccbac	28	#undef elf_shdr
2f79e48a RM	29	#undef elf_note
	30	#undef elf_addr_t
	31	#define elfhdr elf32_hdr
	32	#define elf_phdr elf32_phdr
1fcccbac	33	#define elf_shdr elf32_shdr
2f79e48a RM	34	#define elf_note elf32_note
	35	#define elf_addr_t Elf32_Addr
	36
49ae4d4b DV	37	/*
	38	* Some data types as stored in coredump.
	39	*/
2aa362c4	40	#define user_long_t compat_long_t
49ae4d4b DV	41	#define user_siginfo_t compat_siginfo_t
	42	#define copy_siginfo_to_user copy_siginfo_to_user32
	43
2f79e48a RM	44	/*
	45	* The machine-dependent core note format types are defined in elfcore-compat.h,
	46	* which requires asm/elf.h to define compat_elf_gregset_t et al.
	47	*/
	48	#define elf_prstatus compat_elf_prstatus
	49	#define elf_prpsinfo compat_elf_prpsinfo
	50
cd19c364	51	#undef ns_to_timeval
9afc5eee	52	#define ns_to_timeval ns_to_old_timeval32
2f79e48a RM	53
	54	/*
	55	* To use this file, asm/elf.h must define compat_elf_check_arch.
	56	* The other following macros can be defined if the compat versions
	57	* differ from the native ones, or omitted when they match.
	58	*/
	59
	60	#undef ELF_ARCH
	61	#undef elf_check_arch
	62	#define elf_check_arch compat_elf_check_arch
	63
	64	#ifdef COMPAT_ELF_PLATFORM
	65	#undef ELF_PLATFORM
	66	#define ELF_PLATFORM COMPAT_ELF_PLATFORM
	67	#endif
	68
	69	#ifdef COMPAT_ELF_HWCAP
	70	#undef ELF_HWCAP
	71	#define ELF_HWCAP COMPAT_ELF_HWCAP
	72	#endif
	73
66d6e3b3 AB	74	#ifdef COMPAT_ELF_HWCAP2
	75	#undef ELF_HWCAP2
	76	#define ELF_HWCAP2 COMPAT_ELF_HWCAP2
	77	#endif
	78
2f79e48a RM	79	#ifdef COMPAT_ARCH_DLINFO
	80	#undef ARCH_DLINFO
	81	#define ARCH_DLINFO COMPAT_ARCH_DLINFO
	82	#endif
	83
	84	#ifdef COMPAT_ELF_ET_DYN_BASE
	85	#undef ELF_ET_DYN_BASE
	86	#define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE
	87	#endif
	88
	89	#ifdef COMPAT_ELF_EXEC_PAGESIZE
	90	#undef ELF_EXEC_PAGESIZE
	91	#define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE
	92	#endif
	93
	94	#ifdef COMPAT_ELF_PLAT_INIT
	95	#undef ELF_PLAT_INIT
	96	#define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT
	97	#endif
	98
	99	#ifdef COMPAT_SET_PERSONALITY
	100	#undef SET_PERSONALITY
	101	#define SET_PERSONALITY COMPAT_SET_PERSONALITY
	102	#endif
	103
	104	#ifdef compat_start_thread
	105	#undef start_thread
	106	#define start_thread compat_start_thread
	107	#endif
	108
	109	#ifdef compat_arch_setup_additional_pages
	110	#undef ARCH_HAS_SETUP_ADDITIONAL_PAGES
	111	#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
	112	#undef arch_setup_additional_pages
	113	#define arch_setup_additional_pages compat_arch_setup_additional_pages
	114	#endif
	115
	116	/*
	117	* Rename a few of the symbols that binfmt_elf.c will define.
	118	* These are all local so the names don't really matter, but it
	119	* might make some debugging less confusing not to duplicate them.
	120	*/
	121	#define elf_format compat_elf_format
	122	#define init_elf_binfmt init_compat_elf_binfmt
	123	#define exit_elf_binfmt exit_compat_elf_binfmt
	124
	125	/*
	126	* We share all the actual code with the native (64-bit) version.
	127	*/
	128	#include "binfmt_elf.c"