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 <asm/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:	move.l	%0,%3\n"
34		"7:	clr.l	(%2)+\n"
35		"	subq.l	#1,%3\n"
36		"	jne	7b\n"
37		"	lsl.l	#2,%0\n"
38		"	btst	#1,%5\n"
39		"	jeq	8f\n"
40		"30:	clr.w	(%2)+\n"
41		"	addq.l	#2,%0\n"
42		"8:	btst	#0,%5\n"
43		"	jeq	6b\n"
44		"50:	clr.b	(%2)+\n"
45		"	addq.l	#1,%0\n"
46		"	jra	6b\n"
47		"	.previous\n"
48		"\n"
49		"	.section __ex_table,\"a\"\n"
50		"	.align	4\n"
51		"	.long	1b,10b\n"
52		"	.long	3b,30b\n"
53		"	.long	5b,50b\n"
54		"	.previous"
55		: "=d" (res), "+a" (from), "+a" (to), "=&d" (tmp)
56		: "0" (n / 4), "d" (n & 3));
57
58	return res;
59}
60EXPORT_SYMBOL(__generic_copy_from_user);
61
62unsigned long __generic_copy_to_user(void __user *to, const void *from,
63				     unsigned long n)
64{
65	unsigned long tmp, res;
66
67	asm volatile ("\n"
68		"	tst.l	%0\n"
69		"	jeq	4f\n"
70		"1:	move.l	(%1)+,%3\n"
71		"2:	"MOVES".l	%3,(%2)+\n"
72		"3:	subq.l	#1,%0\n"
73		"	jne	1b\n"
74		"4:	btst	#1,%5\n"
75		"	jeq	6f\n"
76		"	move.w	(%1)+,%3\n"
77		"5:	"MOVES".w	%3,(%2)+\n"
78		"6:	btst	#0,%5\n"
79		"	jeq	8f\n"
80		"	move.b	(%1)+,%3\n"
81		"7:	"MOVES".b  %3,(%2)+\n"
82		"8:\n"
83		"	.section .fixup,\"ax\"\n"
84		"	.even\n"
85		"20:	lsl.l	#2,%0\n"
86		"50:	add.l	%5,%0\n"
87		"	jra	8b\n"
88		"	.previous\n"
89		"\n"
90		"	.section __ex_table,\"a\"\n"
91		"	.align	4\n"
92		"	.long	2b,20b\n"
93		"	.long	3b,20b\n"
94		"	.long	5b,50b\n"
95		"	.long	6b,50b\n"
96		"	.long	7b,50b\n"
97		"	.long	8b,50b\n"
98		"	.previous"
99		: "=d" (res), "+a" (from), "+a" (to), "=&d" (tmp)
100		: "0" (n / 4), "d" (n & 3));
101
102	return res;
103}
104EXPORT_SYMBOL(__generic_copy_to_user);
105
106/*
107 * Zero Userspace
108 */
109
110unsigned long __clear_user(void __user *to, unsigned long n)
111{
112	unsigned long res;
113
114	asm volatile ("\n"
115		"	tst.l	%0\n"
116		"	jeq	3f\n"
117		"1:	"MOVES".l	%2,(%1)+\n"
118		"2:	subq.l	#1,%0\n"
119		"	jne	1b\n"
120		"3:	btst	#1,%4\n"
121		"	jeq	5f\n"
122		"4:	"MOVES".w	%2,(%1)+\n"
123		"5:	btst	#0,%4\n"
124		"	jeq	7f\n"
125		"6:	"MOVES".b	%2,(%1)\n"
126		"7:\n"
127		"	.section .fixup,\"ax\"\n"
128		"	.even\n"
129		"10:	lsl.l	#2,%0\n"
130		"40:	add.l	%4,%0\n"
131		"	jra	7b\n"
132		"	.previous\n"
133		"\n"
134		"	.section __ex_table,\"a\"\n"
135		"	.align	4\n"
136		"	.long	1b,10b\n"
137		"	.long	2b,10b\n"
138		"	.long	4b,40b\n"
139		"	.long	5b,40b\n"
140		"	.long	6b,40b\n"
141		"	.long	7b,40b\n"
142		"	.previous"
143		: "=d" (res), "+a" (to)
144		: "d" (0), "0" (n / 4), "d" (n & 3));
145
146    return res;
147}
148EXPORT_SYMBOL(__clear_user);
149