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>
8#include <linux/uaccess.h>
9
10unsigned 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"
18		"1:	"MOVES".l	(%1)+,%3\n"
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"
24		"3:	"MOVES".w	(%1)+,%3\n"
25		"	move.w	%3,(%2)+\n"
26		"4:	btst	#0,%5\n"
27		"	jeq	6f\n"
28		"5:	"MOVES".b	(%1)+,%3\n"
29		"	move.b  %3,(%2)+\n"
30		"6:\n"
31		"	.section .fixup,\"ax\"\n"
32		"	.even\n"
33		"10:	lsl.l	#2,%0\n"
34		"	btst	#1,%5\n"
35		"	jeq	8f\n"
36		"30:	addq.l	#2,%0\n"
37		"8:	btst	#0,%5\n"
38		"	jeq	6b\n"
39		"50:	addq.l	#1,%0\n"
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"
49		: "=d" (res), "+a" (from), "+a" (to), "=&d" (tmp)
50		: "0" (n / 4), "d" (n & 3));
51
52	return res;
53}
54EXPORT_SYMBOL(__generic_copy_from_user);
55
56unsigned 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"
65		"2:	"MOVES".l	%3,(%2)+\n"
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"
71		"5:	"MOVES".w	%3,(%2)+\n"
72		"6:	btst	#0,%5\n"
73		"	jeq	8f\n"
74		"	move.b	(%1)+,%3\n"
75		"7:	"MOVES".b  %3,(%2)+\n"
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"
81		"	jra	8b\n"
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"
93		: "=d" (res), "+a" (from), "+a" (to), "=&d" (tmp)
94		: "0" (n / 4), "d" (n & 3));
95
96	return res;
97}
98EXPORT_SYMBOL(__generic_copy_to_user);
99
100/*
101 * Zero Userspace
102 */
103
104unsigned long __clear_user(void __user *to, unsigned long n)
105{
106	unsigned long res;
107
108	asm volatile ("\n"
109		"	tst.l	%0\n"
110		"	jeq	3f\n"
111		"1:	"MOVES".l	%2,(%1)+\n"
112		"2:	subq.l	#1,%0\n"
113		"	jne	1b\n"
114		"3:	btst	#1,%4\n"
115		"	jeq	5f\n"
116		"4:	"MOVES".w	%2,(%1)+\n"
117		"5:	btst	#0,%4\n"
118		"	jeq	7f\n"
119		"6:	"MOVES".b	%2,(%1)\n"
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)
138		: "d" (0), "0" (n / 4), "d" (n & 3));
139
140    return res;
141}
142EXPORT_SYMBOL(__clear_user);
143