[linux-block.git] / arch / sparc / include / asm / uaccess_32.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * uaccess.h: User space memore access functions.
 *
 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 */
#ifndef _ASM_UACCESS_H
#define _ASM_UACCESS_H

#include <linux/compiler.h>
#include <linux/string.h>

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

/* 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) ({ \
	void __user *__pu_addr = (ptr); \
	__chk_user_ptr(ptr); \
	__put_user_check((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr))); \
})

#define get_user(x, ptr) ({ \
	const void __user *__gu_addr = (ptr); \
	__chk_user_ptr(ptr); \
	__get_user_check((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr))); \
})

/*
 * The "__xxx" versions do not do address space checking, useful when
 * doing multiple accesses to the same area (the user has to do the
 * checks by hand with "access_ok()")
 */
#define __put_user(x, ptr) \
	__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
#define __get_user(x, ptr) \
    __get_user_nocheck((x), (ptr), sizeof(*(ptr)), __typeof__(*(ptr)))

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

#define __put_user_check(x, addr, size) ({ \
	register int __pu_ret; \
	if (__access_ok(addr, size)) { \
		switch (size) { \
		case 1: \
			__put_user_asm(x, b, addr, __pu_ret); \
			break; \
		case 2: \
			__put_user_asm(x, h, addr, __pu_ret); \
			break; \
		case 4: \
			__put_user_asm(x, , addr, __pu_ret); \
			break; \
		case 8: \
			__put_user_asm(x, d, addr, __pu_ret); \
			break; \
		default: \
			__pu_ret = __put_user_bad(); \
			break; \
		} \
	} else { \
		__pu_ret = -EFAULT; \
	} \
	__pu_ret; \
})

#define __put_user_nocheck(x, addr, size) ({			\
	register int __pu_ret;					\
	switch (size) {						\
	case 1: __put_user_asm(x, b, addr, __pu_ret); break;	\
	case 2: __put_user_asm(x, h, addr, __pu_ret); break;	\
	case 4: __put_user_asm(x, , addr, __pu_ret); break;	\
	case 8: __put_user_asm(x, d, 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 " %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\t"					\
		".previous\n\n\t"					\
		".section __ex_table,#alloc\n\t"			\
		".align	4\n\t"						\
		".word	1b, 3b\n\t"					\
		".previous\n\n\t"					\
	       : "=&r" (ret) : "r" (x), "m" (*__m(addr)),		\
		 "i" (-EFAULT))

int __put_user_bad(void);

#define __get_user_check(x, addr, size, type) ({ \
	register int __gu_ret; \
	register unsigned long __gu_val; \
	if (__access_ok(addr, size)) { \
		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, , addr, __gu_ret); \
			break; \
		case 8: \
			__get_user_asm(__gu_val, d, addr, __gu_ret); \
			break; \
		default: \
			__gu_val = 0; \
			__gu_ret = __get_user_bad(); \
			break; \
		} \
	 } else { \
		 __gu_val = 0; \
		 __gu_ret = -EFAULT; \
	} \
	x = (__force type) __gu_val; \
	__gu_ret; \
})

#define __get_user_nocheck(x, 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, , addr, __gu_ret); break;	\
	case 8: __get_user_asm(__gu_val, d, addr, __gu_ret); break;	\
	default:							\
		__gu_val = 0;						\
		__gu_ret = __get_user_bad();				\
		break;							\
	}								\
	x = (__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 " %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,#alloc\n\t"			\
		".align	4\n\t"						\
		".word	1b, 3b\n\n\t"					\
		".previous\n\t"						\
	       : "=&r" (ret), "=&r" (x) : "m" (*__m(addr)),		\
		 "i" (-EFAULT))

int __get_user_bad(void);

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

static inline unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n)
{
	return __copy_user(to, (__force void __user *) from, n);
}

static inline unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n)
{
	return __copy_user((__force void __user *) to, from, n);
}

#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER

static inline unsigned long __clear_user(void __user *addr, unsigned long size)
{
	unsigned long ret;

	__asm__ __volatile__ (
		"mov %2, %%o1\n"
		"call __bzero\n\t"
		" mov %1, %%o0\n\t"
		"mov %%o0, %0\n"
		: "=r" (ret) : "r" (addr), "r" (size) :
		"o0", "o1", "o2", "o3", "o4", "o5", "o7",
		"g1", "g2", "g3", "g4", "g5", "g7", "cc");

	return ret;
}

static inline unsigned long clear_user(void __user *addr, unsigned long n)
{
	if (n && __access_ok(addr, n))
		return __clear_user(addr, n);
	else
		return n;
}

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

#endif /* _ASM_UACCESS_H */
Commit	Line	Data
	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	/*
	3	* uaccess.h: User space memore access functions.
	4	*
	5	* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
	6	* Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	7	*/
	8	#ifndef _ASM_UACCESS_H
	9	#define _ASM_UACCESS_H
	10
	11	#include <linux/compiler.h>
	12	#include <linux/string.h>
	13
	14	#include <asm/processor.h>
	15	#include <asm-generic/access_ok.h>
	16
	17	/* Uh, these should become the main single-value transfer routines..
	18	* They automatically use the right size if we just have the right
	19	* pointer type..
	20	*
	21	* This gets kind of ugly. We want to return _two_ values in "get_user()"
	22	* and yet we don't want to do any pointers, because that is too much
	23	* of a performance impact. Thus we have a few rather ugly macros here,
	24	* and hide all the ugliness from the user.
	25	*/
	26	#define put_user(x, ptr) ({ \
	27	void __user *__pu_addr = (ptr); \
	28	__chk_user_ptr(ptr); \
	29	__put_user_check((__typeof__((ptr)))(x), __pu_addr, sizeof((ptr))); \
	30	})
	31
	32	#define get_user(x, ptr) ({ \
	33	const void __user *__gu_addr = (ptr); \
	34	__chk_user_ptr(ptr); \
	35	__get_user_check((x), __gu_addr, sizeof((ptr)), __typeof__((ptr))); \
	36	})
	37
	38	/*
	39	* The "__xxx" versions do not do address space checking, useful when
	40	* doing multiple accesses to the same area (the user has to do the
	41	* checks by hand with "access_ok()")
	42	*/
	43	#define __put_user(x, ptr) \
	44	__put_user_nocheck((__typeof__((ptr)))(x), (ptr), sizeof((ptr)))
	45	#define __get_user(x, ptr) \
	46	__get_user_nocheck((x), (ptr), sizeof((ptr)), __typeof__((ptr)))
	47
	48	struct __large_struct { unsigned long buf[100]; };
	49	#define __m(x) ((struct __large_struct __user *)(x))
	50
	51	#define __put_user_check(x, addr, size) ({ \
	52	register int __pu_ret; \
	53	if (__access_ok(addr, size)) { \
	54	switch (size) { \
	55	case 1: \
	56	__put_user_asm(x, b, addr, __pu_ret); \
	57	break; \
	58	case 2: \
	59	__put_user_asm(x, h, addr, __pu_ret); \
	60	break; \
	61	case 4: \
	62	__put_user_asm(x, , addr, __pu_ret); \
	63	break; \
	64	case 8: \
	65	__put_user_asm(x, d, addr, __pu_ret); \
	66	break; \
	67	default: \
	68	__pu_ret = __put_user_bad(); \
	69	break; \
	70	} \
	71	} else { \
	72	__pu_ret = -EFAULT; \
	73	} \
	74	__pu_ret; \
	75	})
	76
	77	#define __put_user_nocheck(x, addr, size) ({ \
	78	register int __pu_ret; \
	79	switch (size) { \
	80	case 1: __put_user_asm(x, b, addr, __pu_ret); break; \
	81	case 2: __put_user_asm(x, h, addr, __pu_ret); break; \
	82	case 4: __put_user_asm(x, , addr, __pu_ret); break; \
	83	case 8: __put_user_asm(x, d, addr, __pu_ret); break; \
	84	default: __pu_ret = __put_user_bad(); break; \
	85	} \
	86	__pu_ret; \
	87	})
	88
	89	#define __put_user_asm(x, size, addr, ret) \
	90	__asm__ __volatile__( \
	91	"/* Put user asm, inline. */\n" \
	92	"1:\t" "st"#size " %1, %2\n\t" \
	93	"clr %0\n" \
	94	"2:\n\n\t" \
	95	".section .fixup,#alloc,#execinstr\n\t" \
	96	".align 4\n" \
	97	"3:\n\t" \
	98	"sethi %%hi(2b), %0\n\t" \
	99	"jmpl %0 + %%lo(2b), %%g0\n\t" \
	100	" mov %3, %0\n\t" \
	101	".previous\n\n\t" \
	102	".section __ex_table,#alloc\n\t" \
	103	".align 4\n\t" \
	104	".word 1b, 3b\n\t" \
	105	".previous\n\n\t" \
	106	: "=&r" (ret) : "r" (x), "m" (*__m(addr)), \
	107	"i" (-EFAULT))
	108
	109	int __put_user_bad(void);
	110
	111	#define __get_user_check(x, addr, size, type) ({ \
	112	register int __gu_ret; \
	113	register unsigned long __gu_val; \
	114	if (__access_ok(addr, size)) { \
	115	switch (size) { \
	116	case 1: \
	117	__get_user_asm(__gu_val, ub, addr, __gu_ret); \
	118	break; \
	119	case 2: \
	120	__get_user_asm(__gu_val, uh, addr, __gu_ret); \
	121	break; \
	122	case 4: \
	123	__get_user_asm(__gu_val, , addr, __gu_ret); \
	124	break; \
	125	case 8: \
	126	__get_user_asm(__gu_val, d, addr, __gu_ret); \
	127	break; \
	128	default: \
	129	__gu_val = 0; \
	130	__gu_ret = __get_user_bad(); \
	131	break; \
	132	} \
	133	} else { \
	134	__gu_val = 0; \
	135	__gu_ret = -EFAULT; \
	136	} \
	137	x = (__force type) __gu_val; \
	138	__gu_ret; \
	139	})
	140
	141	#define __get_user_nocheck(x, addr, size, type) ({ \
	142	register int __gu_ret; \
	143	register unsigned long __gu_val; \
	144	switch (size) { \
	145	case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \
	146	case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \
	147	case 4: __get_user_asm(__gu_val, , addr, __gu_ret); break; \
	148	case 8: __get_user_asm(__gu_val, d, addr, __gu_ret); break; \
	149	default: \
	150	__gu_val = 0; \
	151	__gu_ret = __get_user_bad(); \
	152	break; \
	153	} \
	154	x = (__force type) __gu_val; \
	155	__gu_ret; \
	156	})
	157
	158	#define __get_user_asm(x, size, addr, ret) \
	159	__asm__ __volatile__( \
	160	"/* Get user asm, inline. */\n" \
	161	"1:\t" "ld"#size " %2, %1\n\t" \
	162	"clr %0\n" \
	163	"2:\n\n\t" \
	164	".section .fixup,#alloc,#execinstr\n\t" \
	165	".align 4\n" \
	166	"3:\n\t" \
	167	"sethi %%hi(2b), %0\n\t" \
	168	"clr %1\n\t" \
	169	"jmpl %0 + %%lo(2b), %%g0\n\t" \
	170	" mov %3, %0\n\n\t" \
	171	".previous\n\t" \
	172	".section __ex_table,#alloc\n\t" \
	173	".align 4\n\t" \
	174	".word 1b, 3b\n\n\t" \
	175	".previous\n\t" \
	176	: "=&r" (ret), "=&r" (x) : "m" (*__m(addr)), \
	177	"i" (-EFAULT))
	178
	179	int __get_user_bad(void);
	180
	181	unsigned long __copy_user(void __user to, const void __user from, unsigned long size);
	182
	183	static inline unsigned long raw_copy_to_user(void __user to, const void from, unsigned long n)
	184	{
	185	return __copy_user(to, (__force void __user *) from, n);
	186	}
	187
	188	static inline unsigned long raw_copy_from_user(void to, const void __user from, unsigned long n)
	189	{
	190	return __copy_user((__force void __user *) to, from, n);
	191	}
	192
	193	#define INLINE_COPY_FROM_USER
	194	#define INLINE_COPY_TO_USER
	195
	196	static inline unsigned long __clear_user(void __user *addr, unsigned long size)
	197	{
	198	unsigned long ret;
	199
	200	__asm__ __volatile__ (
	201	"mov %2, %%o1\n"
	202	"call __bzero\n\t"
	203	" mov %1, %%o0\n\t"
	204	"mov %%o0, %0\n"
	205	: "=r" (ret) : "r" (addr), "r" (size) :
	206	"o0", "o1", "o2", "o3", "o4", "o5", "o7",
	207	"g1", "g2", "g3", "g4", "g5", "g7", "cc");
	208
	209	return ret;
	210	}
	211
	212	static inline unsigned long clear_user(void __user *addr, unsigned long n)
	213	{
	214	if (n && __access_ok(addr, n))
	215	return __clear_user(addr, n);
	216	else
	217	return n;
	218	}
	219
	220	__must_check long strnlen_user(const char __user *str, long n);
	221
	222	#endif /* _ASM_UACCESS_H */