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1/*
2 * "memset" implementation for SH4
3 *
4 * Copyright (C) 1999 Niibe Yutaka
5 * Copyright (c) 2009 STMicroelectronics Limited
6 * Author: Stuart Menefy <stuart.menefy:st.com>
7 */
8
9/*
10 * void *memset(void *s, int c, size_t n);
11 */
12
13#include <linux/linkage.h>
14
15ENTRY(memset)
16 mov #12,r0
17 add r6,r4
18 cmp/gt r6,r0
19 bt/s 40f ! if it's too small, set a byte at once
20 mov r4,r0
21 and #3,r0
22 cmp/eq #0,r0
23 bt/s 2f ! It's aligned
24 sub r0,r6
251:
26 dt r0
27 bf/s 1b
28 mov.b r5,@-r4
292: ! make VVVV
30 extu.b r5,r5
31 swap.b r5,r0 ! V0
32 or r0,r5 ! VV
33 swap.w r5,r0 ! VV00
34 or r0,r5 ! VVVV
35
36 ! Check if enough bytes need to be copied to be worth the big loop
37 mov #0x40, r0 ! (MT)
38 cmp/gt r6,r0 ! (MT) 64 > len => slow loop
39
40 bt/s 22f
41 mov r6,r0
42
43 ! align the dst to the cache block size if necessary
44 mov r4, r3
45 mov #~(0x1f), r1
46
47 and r3, r1
48 cmp/eq r3, r1
49
50 bt/s 11f ! dst is already aligned
51 sub r1, r3 ! r3-r1 -> r3
52 shlr2 r3 ! number of loops
53
5410: mov.l r5,@-r4
55 dt r3
56 bf/s 10b
57 add #-4, r6
58
5911: ! dst is 32byte aligned
60 mov r6,r2
61 mov #-5,r0
62 shld r0,r2 ! number of loops
63
64 add #-32, r4
65 mov r5, r0
6612:
67 movca.l r0,@r4
68 mov.l r5,@(4, r4)
69 mov.l r5,@(8, r4)
70 mov.l r5,@(12,r4)
71 mov.l r5,@(16,r4)
72 mov.l r5,@(20,r4)
73 add #-0x20, r6
74 mov.l r5,@(24,r4)
75 dt r2
76 mov.l r5,@(28,r4)
77 bf/s 12b
78 add #-32, r4
79
80 add #32, r4
81 mov #8, r0
82 cmp/ge r0, r6
83 bf 40f
84
85 mov r6,r0
8622:
87 shlr2 r0
88 shlr r0 ! r0 = r6 >> 3
893:
90 dt r0
91 mov.l r5,@-r4 ! set 8-byte at once
92 bf/s 3b
93 mov.l r5,@-r4
94 !
95 mov #7,r0
96 and r0,r6
97
98 ! fill bytes (length may be zero)
9940: tst r6,r6
100 bt 5f
1014:
102 dt r6
103 bf/s 4b
104 mov.b r5,@-r4
1055:
106 rts
107 mov r4,r0
1/*
2 * "memset" implementation for SH4
3 *
4 * Copyright (C) 1999 Niibe Yutaka
5 * Copyright (c) 2009 STMicroelectronics Limited
6 * Author: Stuart Menefy <stuart.menefy:st.com>
7 */
8
9/*
10 * void *memset(void *s, int c, size_t n);
11 */
12
13#include <linux/linkage.h>
14
15ENTRY(memset)
16 mov #12,r0
17 add r6,r4
18 cmp/gt r6,r0
19 bt/s 40f ! if it's too small, set a byte at once
20 mov r4,r0
21 and #3,r0
22 cmp/eq #0,r0
23 bt/s 2f ! It's aligned
24 sub r0,r6
251:
26 dt r0
27 bf/s 1b
28 mov.b r5,@-r4
292: ! make VVVV
30 extu.b r5,r5
31 swap.b r5,r0 ! V0
32 or r0,r5 ! VV
33 swap.w r5,r0 ! VV00
34 or r0,r5 ! VVVV
35
36 ! Check if enough bytes need to be copied to be worth the big loop
37 mov #0x40, r0 ! (MT)
38 cmp/gt r6,r0 ! (MT) 64 > len => slow loop
39
40 bt/s 22f
41 mov r6,r0
42
43 ! align the dst to the cache block size if necessary
44 mov r4, r3
45 mov #~(0x1f), r1
46
47 and r3, r1
48 cmp/eq r3, r1
49
50 bt/s 11f ! dst is already aligned
51 sub r1, r3 ! r3-r1 -> r3
52 shlr2 r3 ! number of loops
53
5410: mov.l r5,@-r4
55 dt r3
56 bf/s 10b
57 add #-4, r6
58
5911: ! dst is 32byte aligned
60 mov r6,r2
61 mov #-5,r0
62 shld r0,r2 ! number of loops
63
64 add #-32, r4
65 mov r5, r0
6612:
67 movca.l r0,@r4
68 mov.l r5,@(4, r4)
69 mov.l r5,@(8, r4)
70 mov.l r5,@(12,r4)
71 mov.l r5,@(16,r4)
72 mov.l r5,@(20,r4)
73 add #-0x20, r6
74 mov.l r5,@(24,r4)
75 dt r2
76 mov.l r5,@(28,r4)
77 bf/s 12b
78 add #-32, r4
79
80 add #32, r4
81 mov #8, r0
82 cmp/ge r0, r6
83 bf 40f
84
85 mov r6,r0
8622:
87 shlr2 r0
88 shlr r0 ! r0 = r6 >> 3
893:
90 dt r0
91 mov.l r5,@-r4 ! set 8-byte at once
92 bf/s 3b
93 mov.l r5,@-r4
94 !
95 mov #7,r0
96 and r0,r6
97
98 ! fill bytes (length may be zero)
9940: tst r6,r6
100 bt 5f
1014:
102 dt r6
103 bf/s 4b
104 mov.b r5,@-r4
1055:
106 rts
107 mov r4,r0