arch/nds32/include/asm/uaccess.h - third_party/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 // Copyright (C) 2005-2017 Andes Technology Corporation

 #ifndef _ASMANDES_UACCESS_H
 #define _ASMANDES_UACCESS_H

 /*
  * User space memory access functions
  */
 #include <linux/sched.h>
 #include <asm/errno.h>
 #include <asm/memory.h>
 #include <asm/types.h>
 #include <linux/mm.h>

 #define VERIFY_READ	0
 #define VERIFY_WRITE	1

 #define __asmeq(x, y)  ".ifnc " x "," y " ; .err ; .endif\n\t"

 /*
  * The exception table consists of pairs of addresses: the first is the
  * address of an instruction that is allowed to fault, and the second is
  * the address at which the program should continue.  No registers are
  * modified, so it is entirely up to the continuation code to figure out
  * what to do.
  *
  * All the routines below use bits of fixup code that are out of line
  * with the main instruction path.  This means when everything is well,
  * we don't even have to jump over them.  Further, they do not intrude
  * on our cache or tlb entries.
  */

 struct exception_table_entry {
 	unsigned long insn, fixup;
 };

 extern int fixup_exception(struct pt_regs *regs);

 #define KERNEL_DS 	((mm_segment_t) { ~0UL })
 #define USER_DS     	((mm_segment_t) {TASK_SIZE - 1})

 #define get_ds()	(KERNEL_DS)
 #define get_fs()	(current_thread_info()->addr_limit)
 #define user_addr_max	get_fs

 static inline void set_fs(mm_segment_t fs)
 {
 	current_thread_info()->addr_limit = fs;
 }

 #define segment_eq(a, b)    ((a) == (b))

 #define __range_ok(addr, size) (size <= get_fs() && addr <= (get_fs() -size))

 #define access_ok(type, addr, size)                 \
 	__range_ok((unsigned long)addr, (unsigned long)size)
 /*
  * Single-value transfer routines.  They automatically use the right
  * size if we just have the right pointer type.  Note that the functions
  * which read from user space (*get_*) need to take care not to leak
  * kernel data even if the calling code is buggy and fails to check
  * the return value.  This means zeroing out the destination variable
  * or buffer on error.  Normally this is done out of line by the
  * fixup code, but there are a few places where it intrudes on the
  * main code path.  When we only write to user space, there is no
  * problem.
  *
  * The "__xxx" versions of the user access functions do not verify the
  * address space - it must have been done previously with a separate
  * "access_ok()" call.
  *
  * The "xxx_error" versions set the third argument to EFAULT if an
  * error occurs, and leave it unchanged on success.  Note that these
  * versions are void (ie, don't return a value as such).
  */

 #define get_user(x,p)							\
 ({									\
 	long __e = -EFAULT;						\
 	if(likely(access_ok(VERIFY_READ,  p, sizeof(*p)))) {		\
 		__e = __get_user(x,p);					\
 	} else								\
 		x = 0;							\
 	__e;								\
 })
 #define __get_user(x,ptr)						\
 ({									\
 	long __gu_err = 0;						\
 	__get_user_err((x),(ptr),__gu_err);				\
 	__gu_err;							\
 })

 #define __get_user_error(x,ptr,err)					\
 ({									\
 	__get_user_err((x),(ptr),err);					\
 	(void) 0;							\
 })

 #define __get_user_err(x,ptr,err)					\
 do {									\
 	unsigned long __gu_addr = (unsigned long)(ptr);			\
 	unsigned long __gu_val;						\
 	__chk_user_ptr(ptr);						\
 	switch (sizeof(*(ptr))) {					\
 	case 1:								\
 		__get_user_asm("lbi",__gu_val,__gu_addr,err);		\
 		break;							\
 	case 2:								\
 		__get_user_asm("lhi",__gu_val,__gu_addr,err);		\
 		break;							\
 	case 4:								\
 		__get_user_asm("lwi",__gu_val,__gu_addr,err);		\
 		break;							\
 	case 8:								\
 		__get_user_asm_dword(__gu_val,__gu_addr,err);		\
 		break;							\
 	default:							\
 		BUILD_BUG(); 						\
 		break;							\
 	}								\
 	(x) = (__typeof__(*(ptr)))__gu_val;				\
 } while (0)

 #define __get_user_asm(inst,x,addr,err)					\
 	asm volatile(							\
 	"1:	"inst"	%1,[%2]\n"					\
 	"2:\n"								\
 	"	.section .fixup,\"ax\"\n"				\
 	"	.align	2\n"						\
 	"3:	move %0, %3\n"						\
 	"	move %1, #0\n"						\
 	"	b	2b\n"						\
 	"	.previous\n"						\
 	"	.section __ex_table,\"a\"\n"				\
 	"	.align	3\n"						\
 	"	.long	1b, 3b\n"					\
 	"	.previous"						\
 	: "+r" (err), "=&r" (x)						\
 	: "r" (addr), "i" (-EFAULT)					\
 	: "cc")

 #ifdef __NDS32_EB__
 #define __gu_reg_oper0 "%H1"
 #define __gu_reg_oper1 "%L1"
 #else
 #define __gu_reg_oper0 "%L1"
 #define __gu_reg_oper1 "%H1"
 #endif

 #define __get_user_asm_dword(x, addr, err) 				\
 	asm volatile(			    				\
 	"\n1:\tlwi " __gu_reg_oper0 ",[%2]\n"				\
 	"\n2:\tlwi " __gu_reg_oper1 ",[%2+4]\n"				\
 	"3:\n"								\
 	"	.section .fixup,\"ax\"\n"				\
 	"	.align	2\n"						\
 	"4:	move	%0, %3\n"					\
 	"	b	3b\n"						\
 	"	.previous\n"						\
 	"	.section __ex_table,\"a\"\n"				\
 	"	.align	3\n"						\
 	"	.long	1b, 4b\n"					\
 	"	.long	2b, 4b\n"					\
 	"	.previous"						\
 	: "+r"(err), "=&r"(x)                				\
 	: "r"(addr), "i"(-EFAULT) 					\
 	: "cc")
 #define put_user(x,p)							\
 ({									\
 	long __e = -EFAULT;						\
 	if(likely(access_ok(VERIFY_WRITE,  p, sizeof(*p)))) {		\
 		__e = __put_user(x,p);					\
 	}								\
 	__e;								\
 })
 #define __put_user(x,ptr)						\
 ({									\
 	long __pu_err = 0;						\
 	__put_user_err((x),(ptr),__pu_err);				\
 	__pu_err;							\
 })

 #define __put_user_error(x,ptr,err)					\
 ({									\
 	__put_user_err((x),(ptr),err);					\
 	(void) 0;							\
 })

 #define __put_user_err(x,ptr,err)					\
 do {									\
 	unsigned long __pu_addr = (unsigned long)(ptr);			\
 	__typeof__(*(ptr)) __pu_val = (x);				\
 	__chk_user_ptr(ptr);						\
 	switch (sizeof(*(ptr))) {					\
 	case 1:								\
 		__put_user_asm("sbi",__pu_val,__pu_addr,err);		\
 		break;							\
 	case 2: 							\
 		__put_user_asm("shi",__pu_val,__pu_addr,err);		\
 		break;							\
 	case 4: 							\
 		__put_user_asm("swi",__pu_val,__pu_addr,err);		\
 		break;							\
 	case 8:								\
 		__put_user_asm_dword(__pu_val,__pu_addr,err);		\
 		break;							\
 	default:							\
 		BUILD_BUG(); 						\
 		break;							\
 	}								\
 } while (0)

 #define __put_user_asm(inst,x,addr,err)					\
 	asm volatile(							\
 	"1:	"inst"	%1,[%2]\n"					\
 	"2:\n"								\
 	"	.section .fixup,\"ax\"\n"				\
 	"	.align	2\n"						\
 	"3:	move	%0, %3\n"					\
 	"	b	2b\n"						\
 	"	.previous\n"						\
 	"	.section __ex_table,\"a\"\n"				\
 	"	.align	3\n"						\
 	"	.long	1b, 3b\n"					\
 	"	.previous"						\
 	: "+r" (err)							\
 	: "r" (x), "r" (addr), "i" (-EFAULT)				\
 	: "cc")

 #ifdef __NDS32_EB__
 #define __pu_reg_oper0 "%H2"
 #define __pu_reg_oper1 "%L2"
 #else
 #define __pu_reg_oper0 "%L2"
 #define __pu_reg_oper1 "%H2"
 #endif

 #define __put_user_asm_dword(x, addr, err) 				\
 	asm volatile(			    				\
 	"\n1:\tswi " __pu_reg_oper0 ",[%1]\n"				\
 	"\n2:\tswi " __pu_reg_oper1 ",[%1+4]\n"				\
 	"3:\n"								\
 	"	.section .fixup,\"ax\"\n"				\
 	"	.align	2\n"						\
 	"4:	move	%0, %3\n"					\
 	"	b	3b\n"						\
 	"	.previous\n"						\
 	"	.section __ex_table,\"a\"\n"				\
 	"	.align	3\n"						\
 	"	.long	1b, 4b\n"					\
 	"	.long	2b, 4b\n"					\
 	"	.previous"						\
 	: "+r"(err)                					\
 	: "r"(addr), "r"(x), "i"(-EFAULT) 				\
 	: "cc")
 extern unsigned long __arch_clear_user(void __user * addr, unsigned long n);
 extern long strncpy_from_user(char *dest, const char __user * src, long count);
 extern __must_check long strlen_user(const char __user * str);
 extern __must_check long strnlen_user(const char __user * str, long n);
 extern unsigned long __arch_copy_from_user(void *to, const void __user * from,
                                            unsigned long n);
 extern unsigned long __arch_copy_to_user(void __user * to, const void *from,
                                          unsigned long n);

 #define raw_copy_from_user __arch_copy_from_user
 #define raw_copy_to_user __arch_copy_to_user

 #define INLINE_COPY_FROM_USER
 #define INLINE_COPY_TO_USER
 static inline unsigned long clear_user(void __user * to, unsigned long n)
 {
 	if (access_ok(VERIFY_WRITE, to, n))
 		n = __arch_clear_user(to, n);
 	return n;
 }

 static inline unsigned long __clear_user(void __user * to, unsigned long n)
 {
 	return __arch_clear_user(to, n);
 }

 #endif /* _ASMNDS32_UACCESS_H */
	// SPDX-License-Identifier: GPL-2.0
	// Copyright (C) 2005-2017 Andes Technology Corporation

	#ifndef _ASMANDES_UACCESS_H
	#define _ASMANDES_UACCESS_H

	/*
	* User space memory access functions
	*/
	#include <linux/sched.h>
	#include <asm/errno.h>
	#include <asm/memory.h>
	#include <asm/types.h>
	#include <linux/mm.h>

	#define VERIFY_READ 0
	#define VERIFY_WRITE 1

	#define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t"

	/*
	* The exception table consists of pairs of addresses: the first is the
	* address of an instruction that is allowed to fault, and the second is
	* the address at which the program should continue. No registers are
	* modified, so it is entirely up to the continuation code to figure out
	* what to do.
	*
	* All the routines below use bits of fixup code that are out of line
	* with the main instruction path. This means when everything is well,
	* we don't even have to jump over them. Further, they do not intrude
	* on our cache or tlb entries.
	*/

	struct exception_table_entry {
	unsigned long insn, fixup;
	};

	extern int fixup_exception(struct pt_regs *regs);

	#define KERNEL_DS ((mm_segment_t) { ~0UL })
	#define USER_DS ((mm_segment_t) {TASK_SIZE - 1})

	#define get_ds() (KERNEL_DS)
	#define get_fs() (current_thread_info()->addr_limit)
	#define user_addr_max get_fs

	static inline void set_fs(mm_segment_t fs)
	{
	current_thread_info()->addr_limit = fs;
	}

	#define segment_eq(a, b) ((a) == (b))

	#define __range_ok(addr, size) (size <= get_fs() && addr <= (get_fs() -size))

	#define access_ok(type, addr, size) \
	__range_ok((unsigned long)addr, (unsigned long)size)
	/*
	* Single-value transfer routines. They automatically use the right
	* size if we just have the right pointer type. Note that the functions
	* which read from user space (get_) need to take care not to leak
	* kernel data even if the calling code is buggy and fails to check
	* the return value. This means zeroing out the destination variable
	* or buffer on error. Normally this is done out of line by the
	* fixup code, but there are a few places where it intrudes on the
	* main code path. When we only write to user space, there is no
	* problem.
	*
	* The "__xxx" versions of the user access functions do not verify the
	* address space - it must have been done previously with a separate
	* "access_ok()" call.
	*
	* The "xxx_error" versions set the third argument to EFAULT if an
	* error occurs, and leave it unchanged on success. Note that these
	* versions are void (ie, don't return a value as such).
	*/

	#define get_user(x,p) \
	({ \
	long __e = -EFAULT; \
	if(likely(access_ok(VERIFY_READ, p, sizeof(*p)))) { \
	__e = __get_user(x,p); \
	} else \
	x = 0; \
	__e; \
	})
	#define __get_user(x,ptr) \
	({ \
	long __gu_err = 0; \
	__get_user_err((x),(ptr),__gu_err); \
	__gu_err; \
	})

	#define __get_user_error(x,ptr,err) \
	({ \
	__get_user_err((x),(ptr),err); \
	(void) 0; \
	})

	#define __get_user_err(x,ptr,err) \
	do { \
	unsigned long __gu_addr = (unsigned long)(ptr); \
	unsigned long __gu_val; \
	__chk_user_ptr(ptr); \
	switch (sizeof(*(ptr))) { \
	case 1: \
	__get_user_asm("lbi",__gu_val,__gu_addr,err); \
	break; \
	case 2: \
	__get_user_asm("lhi",__gu_val,__gu_addr,err); \
	break; \
	case 4: \
	__get_user_asm("lwi",__gu_val,__gu_addr,err); \
	break; \
	case 8: \
	__get_user_asm_dword(__gu_val,__gu_addr,err); \
	break; \
	default: \
	BUILD_BUG(); \
	break; \
	} \
	(x) = (__typeof__(*(ptr)))__gu_val; \
	} while (0)

	#define __get_user_asm(inst,x,addr,err) \
	asm volatile( \
	"1: "inst" %1,[%2]\n" \
	"2:\n" \
	" .section .fixup,\"ax\"\n" \
	" .align 2\n" \
	"3: move %0, %3\n" \
	" move %1, #0\n" \
	" b 2b\n" \
	" .previous\n" \
	" .section __ex_table,\"a\"\n" \
	" .align 3\n" \
	" .long 1b, 3b\n" \
	" .previous" \
	: "+r" (err), "=&r" (x) \
	: "r" (addr), "i" (-EFAULT) \
	: "cc")

	#ifdef __NDS32_EB__
	#define __gu_reg_oper0 "%H1"
	#define __gu_reg_oper1 "%L1"
	#else
	#define __gu_reg_oper0 "%L1"
	#define __gu_reg_oper1 "%H1"
	#endif

	#define __get_user_asm_dword(x, addr, err) \
	asm volatile( \
	"\n1:\tlwi " __gu_reg_oper0 ",[%2]\n" \
	"\n2:\tlwi " __gu_reg_oper1 ",[%2+4]\n" \
	"3:\n" \
	" .section .fixup,\"ax\"\n" \
	" .align 2\n" \
	"4: move %0, %3\n" \
	" b 3b\n" \
	" .previous\n" \
	" .section __ex_table,\"a\"\n" \
	" .align 3\n" \
	" .long 1b, 4b\n" \
	" .long 2b, 4b\n" \
	" .previous" \
	: "+r"(err), "=&r"(x) \
	: "r"(addr), "i"(-EFAULT) \
	: "cc")
	#define put_user(x,p) \
	({ \
	long __e = -EFAULT; \
	if(likely(access_ok(VERIFY_WRITE, p, sizeof(*p)))) { \
	__e = __put_user(x,p); \
	} \
	__e; \
	})
	#define __put_user(x,ptr) \
	({ \
	long __pu_err = 0; \
	__put_user_err((x),(ptr),__pu_err); \
	__pu_err; \
	})

	#define __put_user_error(x,ptr,err) \
	({ \
	__put_user_err((x),(ptr),err); \
	(void) 0; \
	})

	#define __put_user_err(x,ptr,err) \
	do { \
	unsigned long __pu_addr = (unsigned long)(ptr); \
	__typeof__(*(ptr)) __pu_val = (x); \
	__chk_user_ptr(ptr); \
	switch (sizeof(*(ptr))) { \
	case 1: \
	__put_user_asm("sbi",__pu_val,__pu_addr,err); \
	break; \
	case 2: \
	__put_user_asm("shi",__pu_val,__pu_addr,err); \
	break; \
	case 4: \
	__put_user_asm("swi",__pu_val,__pu_addr,err); \
	break; \
	case 8: \
	__put_user_asm_dword(__pu_val,__pu_addr,err); \
	break; \
	default: \
	BUILD_BUG(); \
	break; \
	} \
	} while (0)

	#define __put_user_asm(inst,x,addr,err) \
	asm volatile( \
	"1: "inst" %1,[%2]\n" \
	"2:\n" \
	" .section .fixup,\"ax\"\n" \
	" .align 2\n" \
	"3: move %0, %3\n" \
	" b 2b\n" \
	" .previous\n" \
	" .section __ex_table,\"a\"\n" \
	" .align 3\n" \
	" .long 1b, 3b\n" \
	" .previous" \
	: "+r" (err) \
	: "r" (x), "r" (addr), "i" (-EFAULT) \
	: "cc")

	#ifdef __NDS32_EB__
	#define __pu_reg_oper0 "%H2"
	#define __pu_reg_oper1 "%L2"
	#else
	#define __pu_reg_oper0 "%L2"
	#define __pu_reg_oper1 "%H2"
	#endif

	#define __put_user_asm_dword(x, addr, err) \
	asm volatile( \
	"\n1:\tswi " __pu_reg_oper0 ",[%1]\n" \
	"\n2:\tswi " __pu_reg_oper1 ",[%1+4]\n" \
	"3:\n" \
	" .section .fixup,\"ax\"\n" \
	" .align 2\n" \
	"4: move %0, %3\n" \
	" b 3b\n" \
	" .previous\n" \
	" .section __ex_table,\"a\"\n" \
	" .align 3\n" \
	" .long 1b, 4b\n" \
	" .long 2b, 4b\n" \
	" .previous" \
	: "+r"(err) \
	: "r"(addr), "r"(x), "i"(-EFAULT) \
	: "cc")
	extern unsigned long __arch_clear_user(void __user * addr, unsigned long n);
	extern long strncpy_from_user(char dest, const char __user src, long count);
	extern __must_check long strlen_user(const char __user * str);
	extern __must_check long strnlen_user(const char __user * str, long n);
	extern unsigned long __arch_copy_from_user(void to, const void __user from,
	unsigned long n);
	extern unsigned long __arch_copy_to_user(void __user * to, const void *from,
	unsigned long n);

	#define raw_copy_from_user __arch_copy_from_user
	#define raw_copy_to_user __arch_copy_to_user

	#define INLINE_COPY_FROM_USER
	#define INLINE_COPY_TO_USER
	static inline unsigned long clear_user(void __user * to, unsigned long n)
	{
	if (access_ok(VERIFY_WRITE, to, n))
	n = __arch_clear_user(to, n);
	return n;
	}

	static inline unsigned long __clear_user(void __user * to, unsigned long n)
	{
	return __arch_clear_user(to, n);
	}

	#endif /* _ASMNDS32_UACCESS_H */