aboutsummaryrefslogtreecommitdiff
path: root/arch/m32r/lib/getuser.S
blob: 58a0db055c5c69e843e54b973f7a691d23d49755 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
/*
 * __get_user functions.
 *
 * (C) Copyright 2001 Hirokazu Takata
 *
 * These functions have a non-standard call interface
 * to make them more efficient, especially as they
 * return an error value in addition to the "real"
 * return value.
 */

#include <linux/config.h>

/*
 * __get_user_X
 *
 * Inputs:	r0 contains the address
 *
 * Outputs:	r0 is error code (0 or -EFAULT)
 *		r1 contains zero-extended value
 *
 * These functions should not modify any other registers,
 * as they get called from within inline assembly.
 */

#ifdef CONFIG_ISA_DUAL_ISSUE

	.text
	.balign 4
	.globl __get_user_1
__get_user_1:
1:	ldub	r1, @r0		    ||	ldi	r0, #0
	jmp	r14

	.balign 4
	.globl __get_user_2
__get_user_2:
2:	lduh	r1, @r0		    ||	ldi	r0, #0
	jmp	r14

	.balign 4
	.globl __get_user_4
__get_user_4:
3:	ld	r1, @r0		    ||	ldi	r0, #0
	jmp	r14

bad_get_user:
	ldi	r1, #0		    ||	ldi	r0, #-14
	jmp	r14

#else /* not CONFIG_ISA_DUAL_ISSUE */

	.text
	.balign 4
	.globl __get_user_1
__get_user_1:
1:	ldub	r1, @r0
	ldi	r0, #0
	jmp	r14

	.balign 4
	.globl __get_user_2
__get_user_2:
2:	lduh	r1, @r0
	ldi	r0, #0
	jmp	r14

	.balign 4
	.globl __get_user_4
__get_user_4:
3:	ld	r1, @r0
	ldi	r0, #0
	jmp	r14

bad_get_user:
	ldi	r1, #0
	ldi	r0, #-14
	jmp	r14

#endif /* not CONFIG_ISA_DUAL_ISSUE */

.section __ex_table,"a"
	.long 1b,bad_get_user
	.long 2b,bad_get_user
	.long 3b,bad_get_user
.previous

	.end