[thirdparty/linux.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>

#define ELF_COMPAT	1

/*
 * 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
#undef	ELF_GNU_PROPERTY_ALIGN
#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
#define ELF_GNU_PROPERTY_ALIGN	ELF32_GNU_PROPERTY_ALIGN

/*
 * 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_external	copy_siginfo_to_external32

/*
 * 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_kernel_old_timeval
#define ns_to_kernel_old_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
00e19cee DM	20	#define ELF_COMPAT 1
00e19cee DM	21
2f79e48a RM	22	/*
	23	* Rename the basic ELF layout types to refer to the 32-bit class of files.
	24	*/
	25	#undef ELF_CLASS
	26	#define ELF_CLASS ELFCLASS32
	27
	28	#undef elfhdr
	29	#undef elf_phdr
1fcccbac	30	#undef elf_shdr
2f79e48a RM	31	#undef elf_note
2f79e48a RM	32	#undef elf_addr_t
00e19cee	33	#undef ELF_GNU_PROPERTY_ALIGN
2f79e48a RM	34	#define elfhdr elf32_hdr
2f79e48a RM	35	#define elf_phdr elf32_phdr
1fcccbac	36	#define elf_shdr elf32_shdr
2f79e48a RM	37	#define elf_note elf32_note
2f79e48a RM	38	#define elf_addr_t Elf32_Addr
00e19cee	39	#define ELF_GNU_PROPERTY_ALIGN ELF32_GNU_PROPERTY_ALIGN
2f79e48a	40
49ae4d4b DV	41	/*
	42	* Some data types as stored in coredump.
	43	*/
2aa362c4	44	#define user_long_t compat_long_t
49ae4d4b	45	#define user_siginfo_t compat_siginfo_t
fa4751f4	46	#define copy_siginfo_to_external copy_siginfo_to_external32
49ae4d4b	47
2f79e48a RM	48	/*
	49	* The machine-dependent core note format types are defined in elfcore-compat.h,
	50	* which requires asm/elf.h to define compat_elf_gregset_t et al.
	51	*/
	52	#define elf_prstatus compat_elf_prstatus
	53	#define elf_prpsinfo compat_elf_prpsinfo
	54
e2bb80d5 AB	55	#undef ns_to_kernel_old_timeval
e2bb80d5 AB	56	#define ns_to_kernel_old_timeval ns_to_old_timeval32
2f79e48a RM	57
	58	/*
	59	* To use this file, asm/elf.h must define compat_elf_check_arch.
	60	* The other following macros can be defined if the compat versions
	61	* differ from the native ones, or omitted when they match.
	62	*/
	63
	64	#undef ELF_ARCH
	65	#undef elf_check_arch
	66	#define elf_check_arch compat_elf_check_arch
	67
	68	#ifdef COMPAT_ELF_PLATFORM
	69	#undef ELF_PLATFORM
	70	#define ELF_PLATFORM COMPAT_ELF_PLATFORM
	71	#endif
	72
	73	#ifdef COMPAT_ELF_HWCAP
	74	#undef ELF_HWCAP
	75	#define ELF_HWCAP COMPAT_ELF_HWCAP
	76	#endif
	77
66d6e3b3 AB	78	#ifdef COMPAT_ELF_HWCAP2
	79	#undef ELF_HWCAP2
	80	#define ELF_HWCAP2 COMPAT_ELF_HWCAP2
	81	#endif
	82
2f79e48a RM	83	#ifdef COMPAT_ARCH_DLINFO
	84	#undef ARCH_DLINFO
	85	#define ARCH_DLINFO COMPAT_ARCH_DLINFO
	86	#endif
	87
	88	#ifdef COMPAT_ELF_ET_DYN_BASE
	89	#undef ELF_ET_DYN_BASE
	90	#define ELF_ET_DYN_BASE COMPAT_ELF_ET_DYN_BASE
	91	#endif
	92
	93	#ifdef COMPAT_ELF_EXEC_PAGESIZE
	94	#undef ELF_EXEC_PAGESIZE
	95	#define ELF_EXEC_PAGESIZE COMPAT_ELF_EXEC_PAGESIZE
	96	#endif
	97
	98	#ifdef COMPAT_ELF_PLAT_INIT
	99	#undef ELF_PLAT_INIT
	100	#define ELF_PLAT_INIT COMPAT_ELF_PLAT_INIT
	101	#endif
	102
	103	#ifdef COMPAT_SET_PERSONALITY
	104	#undef SET_PERSONALITY
	105	#define SET_PERSONALITY COMPAT_SET_PERSONALITY
	106	#endif
	107
	108	#ifdef compat_start_thread
	109	#undef start_thread
	110	#define start_thread compat_start_thread
	111	#endif
	112
	113	#ifdef compat_arch_setup_additional_pages
	114	#undef ARCH_HAS_SETUP_ADDITIONAL_PAGES
	115	#define ARCH_HAS_SETUP_ADDITIONAL_PAGES 1
	116	#undef arch_setup_additional_pages
	117	#define arch_setup_additional_pages compat_arch_setup_additional_pages
	118	#endif
	119
	120	/*
	121	* Rename a few of the symbols that binfmt_elf.c will define.
	122	* These are all local so the names don't really matter, but it
	123	* might make some debugging less confusing not to duplicate them.
	124	*/
	125	#define elf_format compat_elf_format
	126	#define init_elf_binfmt init_compat_elf_binfmt
	127	#define exit_elf_binfmt exit_compat_elf_binfmt
	128
	129	/*
	130	* We share all the actual code with the native (64-bit) version.
	131	*/
	132	#include "binfmt_elf.c"