[mirror_ubuntu-bionic-kernel.git] / arch / m68k / lib / uaccess.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/module.h>
#include <linux/uaccess.h>

unsigned long __generic_copy_from_user(void *to, const void __user *from,
				       unsigned long n)
{
	unsigned long tmp, res;

	asm volatile ("\n"
		"	tst.l	%0\n"
		"	jeq	2f\n"
		"1:	"MOVES".l	(%1)+,%3\n"
		"	move.l	%3,(%2)+\n"
		"	subq.l	#1,%0\n"
		"	jne	1b\n"
		"2:	btst	#1,%5\n"
		"	jeq	4f\n"
		"3:	"MOVES".w	(%1)+,%3\n"
		"	move.w	%3,(%2)+\n"
		"4:	btst	#0,%5\n"
		"	jeq	6f\n"
		"5:	"MOVES".b	(%1)+,%3\n"
		"	move.b  %3,(%2)+\n"
		"6:\n"
		"	.section .fixup,\"ax\"\n"
		"	.even\n"
		"10:	lsl.l	#2,%0\n"
		"	btst	#1,%5\n"
		"	jeq	8f\n"
		"30:	addq.l	#2,%0\n"
		"8:	btst	#0,%5\n"
		"	jeq	6b\n"
		"50:	addq.l	#1,%0\n"
		"	jra	6b\n"
		"	.previous\n"
		"\n"
		"	.section __ex_table,\"a\"\n"
		"	.align	4\n"
		"	.long	1b,10b\n"
		"	.long	3b,30b\n"
		"	.long	5b,50b\n"
		"	.previous"
		: "=d" (res), "+a" (from), "+a" (to), "=&d" (tmp)
		: "0" (n / 4), "d" (n & 3));

	return res;
}
EXPORT_SYMBOL(__generic_copy_from_user);

unsigned long __generic_copy_to_user(void __user *to, const void *from,
				     unsigned long n)
{
	unsigned long tmp, res;

	asm volatile ("\n"
		"	tst.l	%0\n"
		"	jeq	4f\n"
		"1:	move.l	(%1)+,%3\n"
		"2:	"MOVES".l	%3,(%2)+\n"
		"3:	subq.l	#1,%0\n"
		"	jne	1b\n"
		"4:	btst	#1,%5\n"
		"	jeq	6f\n"
		"	move.w	(%1)+,%3\n"
		"5:	"MOVES".w	%3,(%2)+\n"
		"6:	btst	#0,%5\n"
		"	jeq	8f\n"
		"	move.b	(%1)+,%3\n"
		"7:	"MOVES".b  %3,(%2)+\n"
		"8:\n"
		"	.section .fixup,\"ax\"\n"
		"	.even\n"
		"20:	lsl.l	#2,%0\n"
		"50:	add.l	%5,%0\n"
		"	jra	8b\n"
		"	.previous\n"
		"\n"
		"	.section __ex_table,\"a\"\n"
		"	.align	4\n"
		"	.long	2b,20b\n"
		"	.long	3b,20b\n"
		"	.long	5b,50b\n"
		"	.long	6b,50b\n"
		"	.long	7b,50b\n"
		"	.long	8b,50b\n"
		"	.previous"
		: "=d" (res), "+a" (from), "+a" (to), "=&d" (tmp)
		: "0" (n / 4), "d" (n & 3));

	return res;
}
EXPORT_SYMBOL(__generic_copy_to_user);

/*
 * Zero Userspace
 */

unsigned long __clear_user(void __user *to, unsigned long n)
{
	unsigned long res;

	asm volatile ("\n"
		"	tst.l	%0\n"
		"	jeq	3f\n"
		"1:	"MOVES".l	%2,(%1)+\n"
		"2:	subq.l	#1,%0\n"
		"	jne	1b\n"
		"3:	btst	#1,%4\n"
		"	jeq	5f\n"
		"4:	"MOVES".w	%2,(%1)+\n"
		"5:	btst	#0,%4\n"
		"	jeq	7f\n"
		"6:	"MOVES".b	%2,(%1)\n"
		"7:\n"
		"	.section .fixup,\"ax\"\n"
		"	.even\n"
		"10:	lsl.l	#2,%0\n"
		"40:	add.l	%4,%0\n"
		"	jra	7b\n"
		"	.previous\n"
		"\n"
		"	.section __ex_table,\"a\"\n"
		"	.align	4\n"
		"	.long	1b,10b\n"
		"	.long	2b,10b\n"
		"	.long	4b,40b\n"
		"	.long	5b,40b\n"
		"	.long	6b,40b\n"
		"	.long	7b,40b\n"
		"	.previous"
		: "=d" (res), "+a" (to)
		: "d" (0), "0" (n / 4), "d" (n & 3));

    return res;
}
EXPORT_SYMBOL(__clear_user);
Commit	Line	Data
d94af931 RZ	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file COPYING in the main directory of this archive
	4	* for more details.
	5	*/
	6
	7	#include <linux/module.h>
7c0f6ba6	8	#include <linux/uaccess.h>
d94af931 RZ	9
	10	unsigned long __generic_copy_from_user(void to, const void __user from,
	11	unsigned long n)
	12	{
	13	unsigned long tmp, res;
	14
	15	asm volatile ("\n"
	16	" tst.l %0\n"
	17	" jeq 2f\n"
e08d703c	18	"1: "MOVES".l (%1)+,%3\n"
d94af931 RZ	19	" move.l %3,(%2)+\n"
	20	" subq.l #1,%0\n"
	21	" jne 1b\n"
	22	"2: btst #1,%5\n"
	23	" jeq 4f\n"
e08d703c	24	"3: "MOVES".w (%1)+,%3\n"
d94af931 RZ	25	" move.w %3,(%2)+\n"
	26	"4: btst #0,%5\n"
	27	" jeq 6f\n"
e08d703c	28	"5: "MOVES".b (%1)+,%3\n"
d94af931 RZ	29	" move.b %3,(%2)+\n"
	30	"6:\n"
	31	" .section .fixup,\"ax\"\n"
	32	" .even\n"
7cefa5a0	33	"10: lsl.l #2,%0\n"
d94af931 RZ	34	" btst #1,%5\n"
d94af931 RZ	35	" jeq 8f\n"
7cefa5a0	36	"30: addq.l #2,%0\n"
d94af931 RZ	37	"8: btst #0,%5\n"
d94af931 RZ	38	" jeq 6b\n"
7cefa5a0	39	"50: addq.l #1,%0\n"
d94af931 RZ	40	" jra 6b\n"
	41	" .previous\n"
	42	"\n"
	43	" .section __ex_table,\"a\"\n"
	44	" .align 4\n"
	45	" .long 1b,10b\n"
	46	" .long 3b,30b\n"
	47	" .long 5b,50b\n"
	48	" .previous"
631d8b67	49	: "=d" (res), "+a" (from), "+a" (to), "=&d" (tmp)
d94af931 RZ	50	: "0" (n / 4), "d" (n & 3));
	51
	52	return res;
	53	}
	54	EXPORT_SYMBOL(__generic_copy_from_user);
	55
	56	unsigned long __generic_copy_to_user(void __user to, const void from,
	57	unsigned long n)
	58	{
	59	unsigned long tmp, res;
	60
	61	asm volatile ("\n"
	62	" tst.l %0\n"
	63	" jeq 4f\n"
	64	"1: move.l (%1)+,%3\n"
e08d703c	65	"2: "MOVES".l %3,(%2)+\n"
d94af931 RZ	66	"3: subq.l #1,%0\n"
	67	" jne 1b\n"
	68	"4: btst #1,%5\n"
	69	" jeq 6f\n"
	70	" move.w (%1)+,%3\n"
e08d703c	71	"5: "MOVES".w %3,(%2)+\n"
d94af931 RZ	72	"6: btst #0,%5\n"
	73	" jeq 8f\n"
	74	" move.b (%1)+,%3\n"
e08d703c	75	"7: "MOVES".b %3,(%2)+\n"
d94af931 RZ	76	"8:\n"
	77	" .section .fixup,\"ax\"\n"
	78	" .even\n"
	79	"20: lsl.l #2,%0\n"
	80	"50: add.l %5,%0\n"
6c04c28a	81	" jra 8b\n"
d94af931 RZ	82	" .previous\n"
	83	"\n"
	84	" .section __ex_table,\"a\"\n"
	85	" .align 4\n"
	86	" .long 2b,20b\n"
	87	" .long 3b,20b\n"
	88	" .long 5b,50b\n"
	89	" .long 6b,50b\n"
	90	" .long 7b,50b\n"
	91	" .long 8b,50b\n"
	92	" .previous"
631d8b67	93	: "=d" (res), "+a" (from), "+a" (to), "=&d" (tmp)
d94af931 RZ	94	: "0" (n / 4), "d" (n & 3));
	95
	96	return res;
	97	}
	98	EXPORT_SYMBOL(__generic_copy_to_user);
	99
d94af931 RZ	100	/*
	101	* Zero Userspace
	102	*/
	103
3c46bdca	104	unsigned long __clear_user(void __user *to, unsigned long n)
d94af931 RZ	105	{
	106	unsigned long res;
	107
	108	asm volatile ("\n"
	109	" tst.l %0\n"
	110	" jeq 3f\n"
e08d703c	111	"1: "MOVES".l %2,(%1)+\n"
d94af931 RZ	112	"2: subq.l #1,%0\n"
	113	" jne 1b\n"
	114	"3: btst #1,%4\n"
	115	" jeq 5f\n"
e08d703c	116	"4: "MOVES".w %2,(%1)+\n"
d94af931 RZ	117	"5: btst #0,%4\n"
d94af931 RZ	118	" jeq 7f\n"
e08d703c	119	"6: "MOVES".b %2,(%1)\n"
d94af931 RZ	120	"7:\n"
	121	" .section .fixup,\"ax\"\n"
	122	" .even\n"
	123	"10: lsl.l #2,%0\n"
	124	"40: add.l %4,%0\n"
	125	" jra 7b\n"
	126	" .previous\n"
	127	"\n"
	128	" .section __ex_table,\"a\"\n"
	129	" .align 4\n"
	130	" .long 1b,10b\n"
	131	" .long 2b,10b\n"
	132	" .long 4b,40b\n"
	133	" .long 5b,40b\n"
	134	" .long 6b,40b\n"
	135	" .long 7b,40b\n"
	136	" .previous"
	137	: "=d" (res), "+a" (to)
631d8b67	138	: "d" (0), "0" (n / 4), "d" (n & 3));
d94af931 RZ	139
	140	return res;
	141	}
3c46bdca	142	EXPORT_SYMBOL(__clear_user);