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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/*
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