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1/*
2 * __clear_user_page, __clear_user, clear_page implementation of SuperH
3 *
4 * Copyright (C) 2001 Kaz Kojima
5 * Copyright (C) 2001, 2002 Niibe Yutaka
6 * Copyright (C) 2006 Paul Mundt
7 */
8#include <linux/linkage.h>
9#include <asm/page.h>
10
11ENTRY(__clear_user)
12 !
13 mov #0, r0
14 mov #0xffffffe0, r1
15 !
16 ! r4..(r4+31)&~32 -------- not aligned [ Area 0 ]
17 ! (r4+31)&~32..(r4+r5)&~32 -------- aligned [ Area 1 ]
18 ! (r4+r5)&~32..r4+r5 -------- not aligned [ Area 2 ]
19 !
20 ! Clear area 0
21 mov r4, r2
22 !
23 tst r1, r5 ! length < 32
24 bt .Larea2 ! skip to remainder
25 !
26 add #31, r2
27 and r1, r2
28 cmp/eq r4, r2
29 bt .Larea1
30 mov r2, r3
31 sub r4, r3
32 mov r3, r7
33 mov r4, r2
34 !
35.L0: dt r3
360: mov.b r0, @r2
37 bf/s .L0
38 add #1, r2
39 !
40 sub r7, r5
41 mov r2, r4
42.Larea1:
43 mov r4, r3
44 add r5, r3
45 and r1, r3
46 cmp/hi r2, r3
47 bf .Larea2
48 !
49 ! Clear area 1
50#if defined(CONFIG_CPU_SH4)
511: movca.l r0, @r2
52#else
531: mov.l r0, @r2
54#endif
55 add #4, r2
562: mov.l r0, @r2
57 add #4, r2
583: mov.l r0, @r2
59 add #4, r2
604: mov.l r0, @r2
61 add #4, r2
625: mov.l r0, @r2
63 add #4, r2
646: mov.l r0, @r2
65 add #4, r2
667: mov.l r0, @r2
67 add #4, r2
688: mov.l r0, @r2
69 add #4, r2
70 cmp/hi r2, r3
71 bt/s 1b
72 nop
73 !
74 ! Clear area 2
75.Larea2:
76 mov r4, r3
77 add r5, r3
78 cmp/hs r3, r2
79 bt/s .Ldone
80 sub r2, r3
81.L2: dt r3
829: mov.b r0, @r2
83 bf/s .L2
84 add #1, r2
85 !
86.Ldone: rts
87 mov #0, r0 ! return 0 as normal return
88
89 ! return the number of bytes remained
90.Lbad_clear_user:
91 mov r4, r0
92 add r5, r0
93 rts
94 sub r2, r0
95
96.section __ex_table,"a"
97 .align 2
98 .long 0b, .Lbad_clear_user
99 .long 1b, .Lbad_clear_user
100 .long 2b, .Lbad_clear_user
101 .long 3b, .Lbad_clear_user
102 .long 4b, .Lbad_clear_user
103 .long 5b, .Lbad_clear_user
104 .long 6b, .Lbad_clear_user
105 .long 7b, .Lbad_clear_user
106 .long 8b, .Lbad_clear_user
107 .long 9b, .Lbad_clear_user
108.previous
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * __clear_user_page, __clear_user, clear_page implementation of SuperH
4 *
5 * Copyright (C) 2001 Kaz Kojima
6 * Copyright (C) 2001, 2002 Niibe Yutaka
7 * Copyright (C) 2006 Paul Mundt
8 */
9#include <linux/linkage.h>
10#include <asm/page.h>
11
12ENTRY(__clear_user)
13 !
14 mov #0, r0
15 mov #0xffffffe0, r1
16 !
17 ! r4..(r4+31)&~32 -------- not aligned [ Area 0 ]
18 ! (r4+31)&~32..(r4+r5)&~32 -------- aligned [ Area 1 ]
19 ! (r4+r5)&~32..r4+r5 -------- not aligned [ Area 2 ]
20 !
21 ! Clear area 0
22 mov r4, r2
23 !
24 tst r1, r5 ! length < 32
25 bt .Larea2 ! skip to remainder
26 !
27 add #31, r2
28 and r1, r2
29 cmp/eq r4, r2
30 bt .Larea1
31 mov r2, r3
32 sub r4, r3
33 mov r3, r7
34 mov r4, r2
35 !
36.L0: dt r3
370: mov.b r0, @r2
38 bf/s .L0
39 add #1, r2
40 !
41 sub r7, r5
42 mov r2, r4
43.Larea1:
44 mov r4, r3
45 add r5, r3
46 and r1, r3
47 cmp/hi r2, r3
48 bf .Larea2
49 !
50 ! Clear area 1
51#if defined(CONFIG_CPU_SH4)
521: movca.l r0, @r2
53#else
541: mov.l r0, @r2
55#endif
56 add #4, r2
572: mov.l r0, @r2
58 add #4, r2
593: mov.l r0, @r2
60 add #4, r2
614: mov.l r0, @r2
62 add #4, r2
635: mov.l r0, @r2
64 add #4, r2
656: mov.l r0, @r2
66 add #4, r2
677: mov.l r0, @r2
68 add #4, r2
698: mov.l r0, @r2
70 add #4, r2
71 cmp/hi r2, r3
72 bt/s 1b
73 nop
74 !
75 ! Clear area 2
76.Larea2:
77 mov r4, r3
78 add r5, r3
79 cmp/hs r3, r2
80 bt/s .Ldone
81 sub r2, r3
82.L2: dt r3
839: mov.b r0, @r2
84 bf/s .L2
85 add #1, r2
86 !
87.Ldone: rts
88 mov #0, r0 ! return 0 as normal return
89
90 ! return the number of bytes remained
91.Lbad_clear_user:
92 mov r4, r0
93 add r5, r0
94 rts
95 sub r2, r0
96
97.section __ex_table,"a"
98 .align 2
99 .long 0b, .Lbad_clear_user
100 .long 1b, .Lbad_clear_user
101 .long 2b, .Lbad_clear_user
102 .long 3b, .Lbad_clear_user
103 .long 4b, .Lbad_clear_user
104 .long 5b, .Lbad_clear_user
105 .long 6b, .Lbad_clear_user
106 .long 7b, .Lbad_clear_user
107 .long 8b, .Lbad_clear_user
108 .long 9b, .Lbad_clear_user
109.previous