arch/sparc/include/asm/uaccess_64.h - linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _ASM_UACCESS_H
 #define _ASM_UACCESS_H

 /*
  * User space memory access functions
  */

 #include <linux/compiler.h>
 #include <linux/string.h>
 #include <linux/mm_types.h>
 #include <asm/asi.h>
 #include <asm/spitfire.h>
 #include <asm/pgtable.h>

 #include <asm/processor.h>
 #include <asm-generic/access_ok.h>

 /*
  * Sparc64 is segmented, though more like the M68K than the I386.
  * We use the secondary ASI to address user memory, which references a
  * completely different VM map, thus there is zero chance of the user
  * doing something queer and tricking us into poking kernel memory.
  */

 /*
  * Test whether a block of memory is a valid user space address.
  * Returns 0 if the range is valid, nonzero otherwise.
  */
 static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, unsigned long limit)
 {
 	if (__builtin_constant_p(size))
 		return addr > limit - size;

 	addr += size;
 	if (addr < size)
 		return true;

 	return addr > limit;
 }

 #define __range_not_ok(addr, size, limit)                               \
 ({                                                                      \
 	__chk_user_ptr(addr);                                           \
 	__chk_range_not_ok((unsigned long __force)(addr), size, limit); \
 })

 void __retl_efault(void);

 /* Uh, these should become the main single-value transfer routines..
  * They automatically use the right size if we just have the right
  * pointer type..
  *
  * This gets kind of ugly. We want to return _two_ values in "get_user()"
  * and yet we don't want to do any pointers, because that is too much
  * of a performance impact. Thus we have a few rather ugly macros here,
  * and hide all the ugliness from the user.
  */
 #define put_user(x, ptr) ({ \
 	unsigned long __pu_addr = (unsigned long)(ptr); \
 	__chk_user_ptr(ptr); \
 	__put_user_nocheck((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr)));\
 })

 #define get_user(x, ptr) ({ \
 	unsigned long __gu_addr = (unsigned long)(ptr); \
 	__chk_user_ptr(ptr); \
 	__get_user_nocheck((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr)));\
 })

 #define __put_user(x, ptr) put_user(x, ptr)
 #define __get_user(x, ptr) get_user(x, ptr)

 struct __large_struct { unsigned long buf[100]; };
 #define __m(x) ((struct __large_struct *)(x))

 #define __put_kernel_nofault(dst, src, type, label)			\
 do {									\
 	type *addr = (type __force *)(dst);				\
 	type data = *(type *)src;					\
 	register int __pu_ret;						\
 	switch (sizeof(type)) {						\
 	case 1: __put_kernel_asm(data, b, addr, __pu_ret); break;	\
 	case 2: __put_kernel_asm(data, h, addr, __pu_ret); break;	\
 	case 4: __put_kernel_asm(data, w, addr, __pu_ret); break;	\
 	case 8: __put_kernel_asm(data, x, addr, __pu_ret); break;	\
 	default: __pu_ret = __put_user_bad(); break;			\
 	}								\
 	if (__pu_ret)							\
 		goto label;						\
 } while (0)

 #define __put_kernel_asm(x, size, addr, ret)				\
 __asm__ __volatile__(							\
 		"/* Put kernel asm, inline. */\n"			\
 	"1:\t"	"st"#size " %1, [%2]\n\t"				\
 		"clr	%0\n"						\
 	"2:\n\n\t"							\
 		".section .fixup,#alloc,#execinstr\n\t"			\
 		".align	4\n"						\
 	"3:\n\t"							\
 		"sethi	%%hi(2b), %0\n\t"				\
 		"jmpl	%0 + %%lo(2b), %%g0\n\t"			\
 		" mov	%3, %0\n\n\t"					\
 		".previous\n\t"						\
 		".section __ex_table,\"a\"\n\t"				\
 		".align	4\n\t"						\
 		".word	1b, 3b\n\t"					\
 		".previous\n\n\t"					\
 	       : "=r" (ret) : "r" (x), "r" (__m(addr)),			\
 		 "i" (-EFAULT))

 #define __put_user_nocheck(data, addr, size) ({			\
 	register int __pu_ret;					\
 	switch (size) {						\
 	case 1: __put_user_asm(data, b, addr, __pu_ret); break;	\
 	case 2: __put_user_asm(data, h, addr, __pu_ret); break;	\
 	case 4: __put_user_asm(data, w, addr, __pu_ret); break;	\
 	case 8: __put_user_asm(data, x, addr, __pu_ret); break;	\
 	default: __pu_ret = __put_user_bad(); break;		\
 	}							\
 	__pu_ret;						\
 })

 #define __put_user_asm(x, size, addr, ret)				\
 __asm__ __volatile__(							\
 		"/* Put user asm, inline. */\n"				\
 	"1:\t"	"st"#size "a %1, [%2] %%asi\n\t"			\
 		"clr	%0\n"						\
 	"2:\n\n\t"							\
 		".section .fixup,#alloc,#execinstr\n\t"			\
 		".align	4\n"						\
 	"3:\n\t"							\
 		"sethi	%%hi(2b), %0\n\t"				\
 		"jmpl	%0 + %%lo(2b), %%g0\n\t"			\
 		" mov	%3, %0\n\n\t"					\
 		".previous\n\t"						\
 		".section __ex_table,\"a\"\n\t"				\
 		".align	4\n\t"						\
 		".word	1b, 3b\n\t"					\
 		".previous\n\n\t"					\
 	       : "=r" (ret) : "r" (x), "r" (__m(addr)),			\
 		 "i" (-EFAULT))

 int __put_user_bad(void);

 #define __get_kernel_nofault(dst, src, type, label)			     \
 do {									     \
 	type *addr = (type __force *)(src);		     		     \
 	register int __gu_ret;						     \
 	register unsigned long __gu_val;				     \
 	switch (sizeof(type)) {						     \
 		case 1: __get_kernel_asm(__gu_val, ub, addr, __gu_ret); break; \
 		case 2: __get_kernel_asm(__gu_val, uh, addr, __gu_ret); break; \
 		case 4: __get_kernel_asm(__gu_val, uw, addr, __gu_ret); break; \
 		case 8: __get_kernel_asm(__gu_val, x, addr, __gu_ret); break;  \
 		default:						     \
 			__gu_val = 0;					     \
 			__gu_ret = __get_user_bad();			     \
 			break;						     \
 	} 								     \
 	if (__gu_ret)							     \
 		goto label;						     \
 	*(type *)dst = (__force type) __gu_val;				     \
 } while (0)
 #define __get_kernel_asm(x, size, addr, ret)				\
 __asm__ __volatile__(							\
 		"/* Get kernel asm, inline. */\n"			\
 	"1:\t"	"ld"#size " [%2], %1\n\t"				\
 		"clr	%0\n"						\
 	"2:\n\n\t"							\
 		".section .fixup,#alloc,#execinstr\n\t"			\
 		".align	4\n"						\
 	"3:\n\t"							\
 		"sethi	%%hi(2b), %0\n\t"				\
 		"clr	%1\n\t"						\
 		"jmpl	%0 + %%lo(2b), %%g0\n\t"			\
 		" mov	%3, %0\n\n\t"					\
 		".previous\n\t"						\
 		".section __ex_table,\"a\"\n\t"				\
 		".align	4\n\t"						\
 		".word	1b, 3b\n\n\t"					\
 		".previous\n\t"						\
 	       : "=r" (ret), "=r" (x) : "r" (__m(addr)),		\
 		 "i" (-EFAULT))

 #define __get_user_nocheck(data, addr, size, type) ({			     \
 	register int __gu_ret;						     \
 	register unsigned long __gu_val;				     \
 	switch (size) {							     \
 		case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \
 		case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \
 		case 4: __get_user_asm(__gu_val, uw, addr, __gu_ret); break; \
 		case 8: __get_user_asm(__gu_val, x, addr, __gu_ret); break;  \
 		default:						     \
 			__gu_val = 0;					     \
 			__gu_ret = __get_user_bad();			     \
 			break;						     \
 	} 								     \
 	data = (__force type) __gu_val;					     \
 	 __gu_ret;							     \
 })

 #define __get_user_asm(x, size, addr, ret)				\
 __asm__ __volatile__(							\
 		"/* Get user asm, inline. */\n"				\
 	"1:\t"	"ld"#size "a [%2] %%asi, %1\n\t"			\
 		"clr	%0\n"						\
 	"2:\n\n\t"							\
 		".section .fixup,#alloc,#execinstr\n\t"			\
 		".align	4\n"						\
 	"3:\n\t"							\
 		"sethi	%%hi(2b), %0\n\t"				\
 		"clr	%1\n\t"						\
 		"jmpl	%0 + %%lo(2b), %%g0\n\t"			\
 		" mov	%3, %0\n\n\t"					\
 		".previous\n\t"						\
 		".section __ex_table,\"a\"\n\t"				\
 		".align	4\n\t"						\
 		".word	1b, 3b\n\n\t"					\
 		".previous\n\t"						\
 	       : "=r" (ret), "=r" (x) : "r" (__m(addr)),		\
 		 "i" (-EFAULT))

 int __get_user_bad(void);

 unsigned long __must_check raw_copy_from_user(void *to,
 					     const void __user *from,
 					     unsigned long size);

 unsigned long __must_check raw_copy_to_user(void __user *to,
 					   const void *from,
 					   unsigned long size);
 #define INLINE_COPY_FROM_USER
 #define INLINE_COPY_TO_USER

 unsigned long __must_check raw_copy_in_user(void __user *to,
 					   const void __user *from,
 					   unsigned long size);

 unsigned long __must_check __clear_user(void __user *, unsigned long);

 #define clear_user __clear_user

 __must_check long strnlen_user(const char __user *str, long n);

 struct pt_regs;
 unsigned long compute_effective_address(struct pt_regs *,
 					unsigned int insn,
 					unsigned int rd);

 #endif /* _ASM_UACCESS_H */
	/* SPDX-License-Identifier: GPL-2.0 */
	#ifndef _ASM_UACCESS_H
	#define _ASM_UACCESS_H

	/*
	* User space memory access functions
	*/

	#include <linux/compiler.h>
	#include <linux/string.h>
	#include <linux/mm_types.h>
	#include <asm/asi.h>
	#include <asm/spitfire.h>
	#include <asm/pgtable.h>

	#include <asm/processor.h>
	#include <asm-generic/access_ok.h>

	/*
	* Sparc64 is segmented, though more like the M68K than the I386.
	* We use the secondary ASI to address user memory, which references a
	* completely different VM map, thus there is zero chance of the user
	* doing something queer and tricking us into poking kernel memory.
	*/

	/*
	* Test whether a block of memory is a valid user space address.
	* Returns 0 if the range is valid, nonzero otherwise.
	*/
	static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, unsigned long limit)
	{
	if (__builtin_constant_p(size))
	return addr > limit - size;

	addr += size;
	if (addr < size)
	return true;

	return addr > limit;
	}

	#define __range_not_ok(addr, size, limit) \
	({ \
	__chk_user_ptr(addr); \
	__chk_range_not_ok((unsigned long __force)(addr), size, limit); \
	})

	void __retl_efault(void);

	/* Uh, these should become the main single-value transfer routines..
	* They automatically use the right size if we just have the right
	* pointer type..
	*
	* This gets kind of ugly. We want to return _two_ values in "get_user()"
	* and yet we don't want to do any pointers, because that is too much
	* of a performance impact. Thus we have a few rather ugly macros here,
	* and hide all the ugliness from the user.
	*/
	#define put_user(x, ptr) ({ \
	unsigned long __pu_addr = (unsigned long)(ptr); \
	__chk_user_ptr(ptr); \
	__put_user_nocheck((__typeof__((ptr)))(x), __pu_addr, sizeof((ptr)));\
	})

	#define get_user(x, ptr) ({ \
	unsigned long __gu_addr = (unsigned long)(ptr); \
	__chk_user_ptr(ptr); \
	__get_user_nocheck((x), __gu_addr, sizeof((ptr)), __typeof__((ptr)));\
	})

	#define __put_user(x, ptr) put_user(x, ptr)
	#define __get_user(x, ptr) get_user(x, ptr)

	struct __large_struct { unsigned long buf[100]; };
	#define __m(x) ((struct __large_struct *)(x))

	#define __put_kernel_nofault(dst, src, type, label) \
	do { \
	type addr = (type __force )(dst); \
	type data = (type )src; \
	register int __pu_ret; \
	switch (sizeof(type)) { \
	case 1: __put_kernel_asm(data, b, addr, __pu_ret); break; \
	case 2: __put_kernel_asm(data, h, addr, __pu_ret); break; \
	case 4: __put_kernel_asm(data, w, addr, __pu_ret); break; \
	case 8: __put_kernel_asm(data, x, addr, __pu_ret); break; \
	default: __pu_ret = __put_user_bad(); break; \
	} \
	if (__pu_ret) \
	goto label; \
	} while (0)

	#define __put_kernel_asm(x, size, addr, ret) \
	__asm__ __volatile__( \
	"/* Put kernel asm, inline. */\n" \
	"1:\t" "st"#size " %1, [%2]\n\t" \
	"clr %0\n" \
	"2:\n\n\t" \
	".section .fixup,#alloc,#execinstr\n\t" \
	".align 4\n" \
	"3:\n\t" \
	"sethi %%hi(2b), %0\n\t" \
	"jmpl %0 + %%lo(2b), %%g0\n\t" \
	" mov %3, %0\n\n\t" \
	".previous\n\t" \
	".section __ex_table,\"a\"\n\t" \
	".align 4\n\t" \
	".word 1b, 3b\n\t" \
	".previous\n\n\t" \
	: "=r" (ret) : "r" (x), "r" (__m(addr)), \
	"i" (-EFAULT))

	#define __put_user_nocheck(data, addr, size) ({ \
	register int __pu_ret; \
	switch (size) { \
	case 1: __put_user_asm(data, b, addr, __pu_ret); break; \
	case 2: __put_user_asm(data, h, addr, __pu_ret); break; \
	case 4: __put_user_asm(data, w, addr, __pu_ret); break; \
	case 8: __put_user_asm(data, x, addr, __pu_ret); break; \
	default: __pu_ret = __put_user_bad(); break; \
	} \
	__pu_ret; \
	})

	#define __put_user_asm(x, size, addr, ret) \
	__asm__ __volatile__( \
	"/* Put user asm, inline. */\n" \
	"1:\t" "st"#size "a %1, [%2] %%asi\n\t" \
	"clr %0\n" \
	"2:\n\n\t" \
	".section .fixup,#alloc,#execinstr\n\t" \
	".align 4\n" \
	"3:\n\t" \
	"sethi %%hi(2b), %0\n\t" \
	"jmpl %0 + %%lo(2b), %%g0\n\t" \
	" mov %3, %0\n\n\t" \
	".previous\n\t" \
	".section __ex_table,\"a\"\n\t" \
	".align 4\n\t" \
	".word 1b, 3b\n\t" \
	".previous\n\n\t" \
	: "=r" (ret) : "r" (x), "r" (__m(addr)), \
	"i" (-EFAULT))

	int __put_user_bad(void);

	#define __get_kernel_nofault(dst, src, type, label) \
	do { \
	type addr = (type __force )(src); \
	register int __gu_ret; \
	register unsigned long __gu_val; \
	switch (sizeof(type)) { \
	case 1: __get_kernel_asm(__gu_val, ub, addr, __gu_ret); break; \
	case 2: __get_kernel_asm(__gu_val, uh, addr, __gu_ret); break; \
	case 4: __get_kernel_asm(__gu_val, uw, addr, __gu_ret); break; \
	case 8: __get_kernel_asm(__gu_val, x, addr, __gu_ret); break; \
	default: \
	__gu_val = 0; \
	__gu_ret = __get_user_bad(); \
	break; \
	} \
	if (__gu_ret) \
	goto label; \
	(type )dst = (__force type) __gu_val; \
	} while (0)
	#define __get_kernel_asm(x, size, addr, ret) \
	__asm__ __volatile__( \
	"/* Get kernel asm, inline. */\n" \
	"1:\t" "ld"#size " [%2], %1\n\t" \
	"clr %0\n" \
	"2:\n\n\t" \
	".section .fixup,#alloc,#execinstr\n\t" \
	".align 4\n" \
	"3:\n\t" \
	"sethi %%hi(2b), %0\n\t" \
	"clr %1\n\t" \
	"jmpl %0 + %%lo(2b), %%g0\n\t" \
	" mov %3, %0\n\n\t" \
	".previous\n\t" \
	".section __ex_table,\"a\"\n\t" \
	".align 4\n\t" \
	".word 1b, 3b\n\n\t" \
	".previous\n\t" \
	: "=r" (ret), "=r" (x) : "r" (__m(addr)), \
	"i" (-EFAULT))

	#define __get_user_nocheck(data, addr, size, type) ({ \
	register int __gu_ret; \
	register unsigned long __gu_val; \
	switch (size) { \
	case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \
	case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \
	case 4: __get_user_asm(__gu_val, uw, addr, __gu_ret); break; \
	case 8: __get_user_asm(__gu_val, x, addr, __gu_ret); break; \
	default: \
	__gu_val = 0; \
	__gu_ret = __get_user_bad(); \
	break; \
	} \
	data = (__force type) __gu_val; \
	__gu_ret; \
	})

	#define __get_user_asm(x, size, addr, ret) \
	__asm__ __volatile__( \
	"/* Get user asm, inline. */\n" \
	"1:\t" "ld"#size "a [%2] %%asi, %1\n\t" \
	"clr %0\n" \
	"2:\n\n\t" \
	".section .fixup,#alloc,#execinstr\n\t" \
	".align 4\n" \
	"3:\n\t" \
	"sethi %%hi(2b), %0\n\t" \
	"clr %1\n\t" \
	"jmpl %0 + %%lo(2b), %%g0\n\t" \
	" mov %3, %0\n\n\t" \
	".previous\n\t" \
	".section __ex_table,\"a\"\n\t" \
	".align 4\n\t" \
	".word 1b, 3b\n\n\t" \
	".previous\n\t" \
	: "=r" (ret), "=r" (x) : "r" (__m(addr)), \
	"i" (-EFAULT))

	int __get_user_bad(void);

	unsigned long __must_check raw_copy_from_user(void *to,
	const void __user *from,
	unsigned long size);

	unsigned long __must_check raw_copy_to_user(void __user *to,
	const void *from,
	unsigned long size);
	#define INLINE_COPY_FROM_USER
	#define INLINE_COPY_TO_USER

	unsigned long __must_check raw_copy_in_user(void __user *to,
	const void __user *from,
	unsigned long size);

	unsigned long __must_check __clear_user(void __user *, unsigned long);

	#define clear_user __clear_user

	__must_check long strnlen_user(const char __user *str, long n);

	struct pt_regs;
	unsigned long compute_effective_address(struct pt_regs *,
	unsigned int insn,
	unsigned int rd);

	#endif /* _ASM_UACCESS_H */