arch/arm64/include/asm/elf.h - linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * Copyright (C) 2012 ARM Ltd.
  */
 #ifndef __ASM_ELF_H
 #define __ASM_ELF_H

 #include <asm/hwcap.h>

 /*
  * ELF register definitions..
  */
 #include <asm/ptrace.h>
 #include <asm/user.h>

 /*
  * AArch64 static relocation types.
  */

 /* Miscellaneous. */
 #define R_ARM_NONE			0
 #define R_AARCH64_NONE			256

 /* Data. */
 #define R_AARCH64_ABS64			257
 #define R_AARCH64_ABS32			258
 #define R_AARCH64_ABS16			259
 #define R_AARCH64_PREL64		260
 #define R_AARCH64_PREL32		261
 #define R_AARCH64_PREL16		262

 /* Instructions. */
 #define R_AARCH64_MOVW_UABS_G0		263
 #define R_AARCH64_MOVW_UABS_G0_NC	264
 #define R_AARCH64_MOVW_UABS_G1		265
 #define R_AARCH64_MOVW_UABS_G1_NC	266
 #define R_AARCH64_MOVW_UABS_G2		267
 #define R_AARCH64_MOVW_UABS_G2_NC	268
 #define R_AARCH64_MOVW_UABS_G3		269

 #define R_AARCH64_MOVW_SABS_G0		270
 #define R_AARCH64_MOVW_SABS_G1		271
 #define R_AARCH64_MOVW_SABS_G2		272

 #define R_AARCH64_LD_PREL_LO19		273
 #define R_AARCH64_ADR_PREL_LO21		274
 #define R_AARCH64_ADR_PREL_PG_HI21	275
 #define R_AARCH64_ADR_PREL_PG_HI21_NC	276
 #define R_AARCH64_ADD_ABS_LO12_NC	277
 #define R_AARCH64_LDST8_ABS_LO12_NC	278

 #define R_AARCH64_TSTBR14		279
 #define R_AARCH64_CONDBR19		280
 #define R_AARCH64_JUMP26		282
 #define R_AARCH64_CALL26		283
 #define R_AARCH64_LDST16_ABS_LO12_NC	284
 #define R_AARCH64_LDST32_ABS_LO12_NC	285
 #define R_AARCH64_LDST64_ABS_LO12_NC	286
 #define R_AARCH64_LDST128_ABS_LO12_NC	299

 #define R_AARCH64_MOVW_PREL_G0		287
 #define R_AARCH64_MOVW_PREL_G0_NC	288
 #define R_AARCH64_MOVW_PREL_G1		289
 #define R_AARCH64_MOVW_PREL_G1_NC	290
 #define R_AARCH64_MOVW_PREL_G2		291
 #define R_AARCH64_MOVW_PREL_G2_NC	292
 #define R_AARCH64_MOVW_PREL_G3		293

 #define R_AARCH64_RELATIVE		1027

 /*
  * These are used to set parameters in the core dumps.
  */
 #define ELF_CLASS	ELFCLASS64
 #ifdef __AARCH64EB__
 #define ELF_DATA	ELFDATA2MSB
 #else
 #define ELF_DATA	ELFDATA2LSB
 #endif
 #define ELF_ARCH	EM_AARCH64

 /*
  * This yields a string that ld.so will use to load implementation
  * specific libraries for optimization.  This is more specific in
  * intent than poking at uname or /proc/cpuinfo.
  */
 #define ELF_PLATFORM_SIZE	16
 #ifdef __AARCH64EB__
 #define ELF_PLATFORM		("aarch64_be")
 #else
 #define ELF_PLATFORM		("aarch64")
 #endif

 /*
  * This is used to ensure we don't load something for the wrong architecture.
  */
 #define elf_check_arch(x)		((x)->e_machine == EM_AARCH64)

 /*
  * An executable for which elf_read_implies_exec() returns TRUE will
  * have the READ_IMPLIES_EXEC personality flag set automatically.
  *
  * The decision process for determining the results are:
  *
  *                CPU*: | arm32      | arm64      |
  * ELF:                 |            |            |
  * ---------------------|------------|------------|
  * missing PT_GNU_STACK | exec-all   | exec-none  |
  * PT_GNU_STACK == RWX  | exec-stack | exec-stack |
  * PT_GNU_STACK == RW   | exec-none  | exec-none  |
  *
  *  exec-all  : all PROT_READ user mappings are executable, except when
  *              backed by files on a noexec-filesystem.
  *  exec-none : only PROT_EXEC user mappings are executable.
  *  exec-stack: only the stack and PROT_EXEC user mappings are executable.
  *
  *  *all arm64 CPUs support NX, so there is no "lacks NX" column.
  *
  */
 #define compat_elf_read_implies_exec(ex, stk)	(stk == EXSTACK_DEFAULT)

 #define CORE_DUMP_USE_REGSET
 #define ELF_EXEC_PAGESIZE	PAGE_SIZE

 /*
  * This is the base location for PIE (ET_DYN with INTERP) loads. On
  * 64-bit, this is above 4GB to leave the entire 32-bit address
  * space open for things that want to use the area for 32-bit pointers.
  */
 #ifdef CONFIG_ARM64_FORCE_52BIT
 #define ELF_ET_DYN_BASE		(2 * TASK_SIZE_64 / 3)
 #else
 #define ELF_ET_DYN_BASE		(2 * DEFAULT_MAP_WINDOW_64 / 3)
 #endif /* CONFIG_ARM64_FORCE_52BIT */

 #ifndef __ASSEMBLY__

 #include <uapi/linux/elf.h>
 #include <linux/bug.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
 #include <linux/types.h>
 #include <asm/processor.h> /* for signal_minsigstksz, used by ARCH_DLINFO */

 typedef unsigned long elf_greg_t;

 #define ELF_NGREG (sizeof(struct user_pt_regs) / sizeof(elf_greg_t))
 #define ELF_CORE_COPY_REGS(dest, regs)	\
 	*(struct user_pt_regs *)&(dest) = (regs)->user_regs;

 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
 typedef struct user_fpsimd_state elf_fpregset_t;

 /*
  * When the program starts, a1 contains a pointer to a function to be
  * registered with atexit, as per the SVR4 ABI.  A value of 0 means we have no
  * such handler.
  */
 #define ELF_PLAT_INIT(_r, load_addr)	(_r)->regs[0] = 0

 #define SET_PERSONALITY(ex)						\
 ({									\
 	clear_thread_flag(TIF_32BIT);					\
 	current->personality &= ~READ_IMPLIES_EXEC;			\
 })

 /* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
 #define ARCH_DLINFO							\
 do {									\
 	NEW_AUX_ENT(AT_SYSINFO_EHDR,					\
 		    (elf_addr_t)current->mm->context.vdso);		\
 									\
 	/*								\
 	 * Should always be nonzero unless there's a kernel bug.	\
 	 * If we haven't determined a sensible value to give to		\
 	 * userspace, omit the entry:					\
 	 */								\
 	if (likely(signal_minsigstksz))					\
 		NEW_AUX_ENT(AT_MINSIGSTKSZ, signal_minsigstksz);	\
 	else								\
 		NEW_AUX_ENT(AT_IGNORE, 0);				\
 } while (0)

 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES
 struct linux_binprm;
 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 				       int uses_interp);

 /* 1GB of VA */
 #ifdef CONFIG_COMPAT
 #define STACK_RND_MASK			(test_thread_flag(TIF_32BIT) ? \
 						0x7ff >> (PAGE_SHIFT - 12) : \
 						0x3ffff >> (PAGE_SHIFT - 12))
 #else
 #define STACK_RND_MASK			(0x3ffff >> (PAGE_SHIFT - 12))
 #endif

 #ifdef __AARCH64EB__
 #define COMPAT_ELF_PLATFORM		("v8b")
 #else
 #define COMPAT_ELF_PLATFORM		("v8l")
 #endif

 /* AArch32 registers. */
 #define COMPAT_ELF_NGREG		18
 typedef unsigned int			compat_elf_greg_t;
 typedef compat_elf_greg_t		compat_elf_gregset_t[COMPAT_ELF_NGREG];

 #ifdef CONFIG_COMPAT

 /* PIE load location for compat arm. Must match ARM ELF_ET_DYN_BASE. */
 #define COMPAT_ELF_ET_DYN_BASE		0x000400000UL

 /* AArch32 EABI. */
 #define EF_ARM_EABI_MASK		0xff000000
 int compat_elf_check_arch(const struct elf32_hdr *);
 #define compat_elf_check_arch		compat_elf_check_arch
 #define compat_start_thread		compat_start_thread
 /*
  * Unlike the native SET_PERSONALITY macro, the compat version maintains
  * READ_IMPLIES_EXEC across an execve() since this is the behaviour on
  * arch/arm/.
  */
 #define COMPAT_SET_PERSONALITY(ex)					\
 ({									\
 	set_thread_flag(TIF_32BIT);					\
  })
 #ifdef CONFIG_COMPAT_VDSO
 #define COMPAT_ARCH_DLINFO						\
 do {									\
 	/*								\
 	 * Note that we use Elf64_Off instead of elf_addr_t because	\
 	 * elf_addr_t in compat is defined as Elf32_Addr and casting	\
 	 * current->mm->context.vdso to it triggers a cast warning of	\
 	 * cast from pointer to integer of different size.		\
 	 */								\
 	NEW_AUX_ENT(AT_SYSINFO_EHDR,					\
 			(Elf64_Off)current->mm->context.vdso);		\
 } while (0)
 #else
 #define COMPAT_ARCH_DLINFO
 #endif
 extern int aarch32_setup_additional_pages(struct linux_binprm *bprm,
 					  int uses_interp);
 #define compat_arch_setup_additional_pages \
 					aarch32_setup_additional_pages

 #endif /* CONFIG_COMPAT */

 struct arch_elf_state {
 	int flags;
 };

 #define ARM64_ELF_BTI		(1 << 0)

 #define INIT_ARCH_ELF_STATE {			\
 	.flags = 0,				\
 }

 static inline int arch_parse_elf_property(u32 type, const void *data,
 					  size_t datasz, bool compat,
 					  struct arch_elf_state *arch)
 {
 	/* No known properties for AArch32 yet */
 	if (IS_ENABLED(CONFIG_COMPAT) && compat)
 		return 0;

 	if (type == GNU_PROPERTY_AARCH64_FEATURE_1_AND) {
 		const u32 *p = data;

 		if (datasz != sizeof(*p))
 			return -ENOEXEC;

 		if (system_supports_bti() &&
 		    (*p & GNU_PROPERTY_AARCH64_FEATURE_1_BTI))
 			arch->flags |= ARM64_ELF_BTI;
 	}

 	return 0;
 }

 static inline int arch_elf_pt_proc(void *ehdr, void *phdr,
 				   struct file *f, bool is_interp,
 				   struct arch_elf_state *state)
 {
 	return 0;
 }

 static inline int arch_check_elf(void *ehdr, bool has_interp,
 				 void *interp_ehdr,
 				 struct arch_elf_state *state)
 {
 	return 0;
 }

 #endif /* !__ASSEMBLY__ */

 #endif
	/* SPDX-License-Identifier: GPL-2.0-only */
	/*
	* Copyright (C) 2012 ARM Ltd.
	*/
	#ifndef __ASM_ELF_H
	#define __ASM_ELF_H

	#include <asm/hwcap.h>

	/*
	* ELF register definitions..
	*/
	#include <asm/ptrace.h>
	#include <asm/user.h>

	/*
	* AArch64 static relocation types.
	*/

	/* Miscellaneous. */
	#define R_ARM_NONE 0
	#define R_AARCH64_NONE 256

	/* Data. */
	#define R_AARCH64_ABS64 257
	#define R_AARCH64_ABS32 258
	#define R_AARCH64_ABS16 259
	#define R_AARCH64_PREL64 260
	#define R_AARCH64_PREL32 261
	#define R_AARCH64_PREL16 262

	/* Instructions. */
	#define R_AARCH64_MOVW_UABS_G0 263
	#define R_AARCH64_MOVW_UABS_G0_NC 264
	#define R_AARCH64_MOVW_UABS_G1 265
	#define R_AARCH64_MOVW_UABS_G1_NC 266
	#define R_AARCH64_MOVW_UABS_G2 267
	#define R_AARCH64_MOVW_UABS_G2_NC 268
	#define R_AARCH64_MOVW_UABS_G3 269

	#define R_AARCH64_MOVW_SABS_G0 270
	#define R_AARCH64_MOVW_SABS_G1 271
	#define R_AARCH64_MOVW_SABS_G2 272

	#define R_AARCH64_LD_PREL_LO19 273
	#define R_AARCH64_ADR_PREL_LO21 274
	#define R_AARCH64_ADR_PREL_PG_HI21 275
	#define R_AARCH64_ADR_PREL_PG_HI21_NC 276
	#define R_AARCH64_ADD_ABS_LO12_NC 277
	#define R_AARCH64_LDST8_ABS_LO12_NC 278

	#define R_AARCH64_TSTBR14 279
	#define R_AARCH64_CONDBR19 280
	#define R_AARCH64_JUMP26 282
	#define R_AARCH64_CALL26 283
	#define R_AARCH64_LDST16_ABS_LO12_NC 284
	#define R_AARCH64_LDST32_ABS_LO12_NC 285
	#define R_AARCH64_LDST64_ABS_LO12_NC 286
	#define R_AARCH64_LDST128_ABS_LO12_NC 299

	#define R_AARCH64_MOVW_PREL_G0 287
	#define R_AARCH64_MOVW_PREL_G0_NC 288
	#define R_AARCH64_MOVW_PREL_G1 289
	#define R_AARCH64_MOVW_PREL_G1_NC 290
	#define R_AARCH64_MOVW_PREL_G2 291
	#define R_AARCH64_MOVW_PREL_G2_NC 292
	#define R_AARCH64_MOVW_PREL_G3 293

	#define R_AARCH64_RELATIVE 1027

	/*
	* These are used to set parameters in the core dumps.
	*/
	#define ELF_CLASS ELFCLASS64
	#ifdef __AARCH64EB__
	#define ELF_DATA ELFDATA2MSB
	#else
	#define ELF_DATA ELFDATA2LSB
	#endif
	#define ELF_ARCH EM_AARCH64

	/*
	* This yields a string that ld.so will use to load implementation
	* specific libraries for optimization. This is more specific in
	* intent than poking at uname or /proc/cpuinfo.
	*/
	#define ELF_PLATFORM_SIZE 16
	#ifdef __AARCH64EB__
	#define ELF_PLATFORM ("aarch64_be")
	#else
	#define ELF_PLATFORM ("aarch64")
	#endif

	/*
	* This is used to ensure we don't load something for the wrong architecture.
	*/
	#define elf_check_arch(x) ((x)->e_machine == EM_AARCH64)

	/*
	* An executable for which elf_read_implies_exec() returns TRUE will
	* have the READ_IMPLIES_EXEC personality flag set automatically.
	*
	* The decision process for determining the results are:
	*
	* CPU*: \| arm32 \| arm64 \|
	* ELF: \| \| \|
	* ---------------------\|------------\|------------\|
	* missing PT_GNU_STACK \| exec-all \| exec-none \|
	* PT_GNU_STACK == RWX \| exec-stack \| exec-stack \|
	* PT_GNU_STACK == RW \| exec-none \| exec-none \|
	*
	* exec-all : all PROT_READ user mappings are executable, except when
	* backed by files on a noexec-filesystem.
	* exec-none : only PROT_EXEC user mappings are executable.
	* exec-stack: only the stack and PROT_EXEC user mappings are executable.
	*
	* *all arm64 CPUs support NX, so there is no "lacks NX" column.
	*
	*/
	#define compat_elf_read_implies_exec(ex, stk) (stk == EXSTACK_DEFAULT)

	#define CORE_DUMP_USE_REGSET
	#define ELF_EXEC_PAGESIZE PAGE_SIZE

	/*
	* This is the base location for PIE (ET_DYN with INTERP) loads. On
	* 64-bit, this is above 4GB to leave the entire 32-bit address
	* space open for things that want to use the area for 32-bit pointers.
	*/
	#ifdef CONFIG_ARM64_FORCE_52BIT
	#define ELF_ET_DYN_BASE (2 * TASK_SIZE_64 / 3)
	#else
	#define ELF_ET_DYN_BASE (2 * DEFAULT_MAP_WINDOW_64 / 3)
	#endif /* CONFIG_ARM64_FORCE_52BIT */

	#ifndef __ASSEMBLY__

	#include <uapi/linux/elf.h>
	#include <linux/bug.h>
	#include <linux/errno.h>
	#include <linux/fs.h>
	#include <linux/types.h>
	#include <asm/processor.h> /* for signal_minsigstksz, used by ARCH_DLINFO */

	typedef unsigned long elf_greg_t;

	#define ELF_NGREG (sizeof(struct user_pt_regs) / sizeof(elf_greg_t))
	#define ELF_CORE_COPY_REGS(dest, regs) \
	(struct user_pt_regs )&(dest) = (regs)->user_regs;

	typedef elf_greg_t elf_gregset_t[ELF_NGREG];
	typedef struct user_fpsimd_state elf_fpregset_t;

	/*
	* When the program starts, a1 contains a pointer to a function to be
	* registered with atexit, as per the SVR4 ABI. A value of 0 means we have no
	* such handler.
	*/
	#define ELF_PLAT_INIT(_r, load_addr) (_r)->regs[0] = 0

	#define SET_PERSONALITY(ex) \
	({ \
	clear_thread_flag(TIF_32BIT); \
	current->personality &= ~READ_IMPLIES_EXEC; \
	})

	/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */
	#define ARCH_DLINFO \
	do { \
	NEW_AUX_ENT(AT_SYSINFO_EHDR, \
	(elf_addr_t)current->mm->context.vdso); \
	\
	/* \
	* Should always be nonzero unless there's a kernel bug. \
	* If we haven't determined a sensible value to give to \
	* userspace, omit the entry: \
	*/ \
	if (likely(signal_minsigstksz)) \
	NEW_AUX_ENT(AT_MINSIGSTKSZ, signal_minsigstksz); \
	else \
	NEW_AUX_ENT(AT_IGNORE, 0); \
	} while (0)

	#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
	struct linux_binprm;
	extern int arch_setup_additional_pages(struct linux_binprm *bprm,
	int uses_interp);

	/* 1GB of VA */
	#ifdef CONFIG_COMPAT
	#define STACK_RND_MASK (test_thread_flag(TIF_32BIT) ? \
	0x7ff >> (PAGE_SHIFT - 12) : \
	0x3ffff >> (PAGE_SHIFT - 12))
	#else
	#define STACK_RND_MASK (0x3ffff >> (PAGE_SHIFT - 12))
	#endif

	#ifdef __AARCH64EB__
	#define COMPAT_ELF_PLATFORM ("v8b")
	#else
	#define COMPAT_ELF_PLATFORM ("v8l")
	#endif

	/* AArch32 registers. */
	#define COMPAT_ELF_NGREG 18
	typedef unsigned int compat_elf_greg_t;
	typedef compat_elf_greg_t compat_elf_gregset_t[COMPAT_ELF_NGREG];

	#ifdef CONFIG_COMPAT

	/* PIE load location for compat arm. Must match ARM ELF_ET_DYN_BASE. */
	#define COMPAT_ELF_ET_DYN_BASE 0x000400000UL

	/* AArch32 EABI. */
	#define EF_ARM_EABI_MASK 0xff000000
	int compat_elf_check_arch(const struct elf32_hdr *);
	#define compat_elf_check_arch compat_elf_check_arch
	#define compat_start_thread compat_start_thread
	/*
	* Unlike the native SET_PERSONALITY macro, the compat version maintains
	* READ_IMPLIES_EXEC across an execve() since this is the behaviour on
	* arch/arm/.
	*/
	#define COMPAT_SET_PERSONALITY(ex) \
	({ \
	set_thread_flag(TIF_32BIT); \
	})
	#ifdef CONFIG_COMPAT_VDSO
	#define COMPAT_ARCH_DLINFO \
	do { \
	/* \
	* Note that we use Elf64_Off instead of elf_addr_t because \
	* elf_addr_t in compat is defined as Elf32_Addr and casting \
	* current->mm->context.vdso to it triggers a cast warning of \
	* cast from pointer to integer of different size. \
	*/ \
	NEW_AUX_ENT(AT_SYSINFO_EHDR, \
	(Elf64_Off)current->mm->context.vdso); \
	} while (0)
	#else
	#define COMPAT_ARCH_DLINFO
	#endif
	extern int aarch32_setup_additional_pages(struct linux_binprm *bprm,
	int uses_interp);
	#define compat_arch_setup_additional_pages \
	aarch32_setup_additional_pages

	#endif /* CONFIG_COMPAT */

	struct arch_elf_state {
	int flags;
	};

	#define ARM64_ELF_BTI (1 << 0)

	#define INIT_ARCH_ELF_STATE { \
	.flags = 0, \
	}

	static inline int arch_parse_elf_property(u32 type, const void *data,
	size_t datasz, bool compat,
	struct arch_elf_state *arch)
	{
	/* No known properties for AArch32 yet */
	if (IS_ENABLED(CONFIG_COMPAT) && compat)
	return 0;

	if (type == GNU_PROPERTY_AARCH64_FEATURE_1_AND) {
	const u32 *p = data;

	if (datasz != sizeof(*p))
	return -ENOEXEC;

	if (system_supports_bti() &&
	(*p & GNU_PROPERTY_AARCH64_FEATURE_1_BTI))
	arch->flags \|= ARM64_ELF_BTI;
	}

	return 0;
	}

	static inline int arch_elf_pt_proc(void ehdr, void phdr,
	struct file *f, bool is_interp,
	struct arch_elf_state *state)
	{
	return 0;
	}

	static inline int arch_check_elf(void *ehdr, bool has_interp,
	void *interp_ehdr,
	struct arch_elf_state *state)
	{
	return 0;
	}

	#endif /* !__ASSEMBLY__ */

	#endif