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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/lib/io-readsb.S | |
3 | * | |
4 | * Copyright (C) 1995-2000 Russell King | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | #include <linux/linkage.h> | |
11 | #include <asm/assembler.h> | |
12 | ||
a9c4814d | 13 | .Linsb_align: rsb ip, ip, #4 |
1da177e4 LT |
14 | cmp ip, r2 |
15 | movgt ip, r2 | |
16 | cmp ip, #2 | |
17 | ldrb r3, [r0] | |
18 | strb r3, [r1], #1 | |
e44fc388 SA |
19 | ldrbge r3, [r0] |
20 | strbge r3, [r1], #1 | |
21 | ldrbgt r3, [r0] | |
22 | strbgt r3, [r1], #1 | |
1da177e4 | 23 | subs r2, r2, ip |
a9c4814d | 24 | bne .Linsb_aligned |
1da177e4 LT |
25 | |
26 | ENTRY(__raw_readsb) | |
27 | teq r2, #0 @ do we have to check for the zero len? | |
6ebbf2ce | 28 | reteq lr |
1da177e4 | 29 | ands ip, r1, #3 |
a9c4814d | 30 | bne .Linsb_align |
1da177e4 | 31 | |
a9c4814d | 32 | .Linsb_aligned: stmfd sp!, {r4 - r6, lr} |
1da177e4 LT |
33 | |
34 | subs r2, r2, #16 | |
a9c4814d | 35 | bmi .Linsb_no_16 |
1da177e4 | 36 | |
a9c4814d | 37 | .Linsb_16_lp: ldrb r3, [r0] |
1da177e4 LT |
38 | ldrb r4, [r0] |
39 | ldrb r5, [r0] | |
40 | mov r3, r3, put_byte_0 | |
41 | ldrb r6, [r0] | |
42 | orr r3, r3, r4, put_byte_1 | |
43 | ldrb r4, [r0] | |
44 | orr r3, r3, r5, put_byte_2 | |
45 | ldrb r5, [r0] | |
46 | orr r3, r3, r6, put_byte_3 | |
47 | ldrb r6, [r0] | |
48 | mov r4, r4, put_byte_0 | |
49 | ldrb ip, [r0] | |
50 | orr r4, r4, r5, put_byte_1 | |
51 | ldrb r5, [r0] | |
52 | orr r4, r4, r6, put_byte_2 | |
53 | ldrb r6, [r0] | |
54 | orr r4, r4, ip, put_byte_3 | |
55 | ldrb ip, [r0] | |
56 | mov r5, r5, put_byte_0 | |
57 | ldrb lr, [r0] | |
58 | orr r5, r5, r6, put_byte_1 | |
59 | ldrb r6, [r0] | |
60 | orr r5, r5, ip, put_byte_2 | |
61 | ldrb ip, [r0] | |
62 | orr r5, r5, lr, put_byte_3 | |
63 | ldrb lr, [r0] | |
64 | mov r6, r6, put_byte_0 | |
65 | orr r6, r6, ip, put_byte_1 | |
66 | ldrb ip, [r0] | |
67 | orr r6, r6, lr, put_byte_2 | |
68 | orr r6, r6, ip, put_byte_3 | |
69 | stmia r1!, {r3 - r6} | |
70 | ||
71 | subs r2, r2, #16 | |
a9c4814d | 72 | bpl .Linsb_16_lp |
1da177e4 LT |
73 | |
74 | tst r2, #15 | |
e44fc388 | 75 | ldmfdeq sp!, {r4 - r6, pc} |
1da177e4 | 76 | |
a9c4814d NP |
77 | .Linsb_no_16: tst r2, #8 |
78 | beq .Linsb_no_8 | |
1da177e4 LT |
79 | |
80 | ldrb r3, [r0] | |
81 | ldrb r4, [r0] | |
82 | ldrb r5, [r0] | |
83 | mov r3, r3, put_byte_0 | |
84 | ldrb r6, [r0] | |
85 | orr r3, r3, r4, put_byte_1 | |
86 | ldrb r4, [r0] | |
87 | orr r3, r3, r5, put_byte_2 | |
88 | ldrb r5, [r0] | |
89 | orr r3, r3, r6, put_byte_3 | |
90 | ldrb r6, [r0] | |
91 | mov r4, r4, put_byte_0 | |
92 | ldrb ip, [r0] | |
93 | orr r4, r4, r5, put_byte_1 | |
94 | orr r4, r4, r6, put_byte_2 | |
95 | orr r4, r4, ip, put_byte_3 | |
96 | stmia r1!, {r3, r4} | |
97 | ||
a9c4814d NP |
98 | .Linsb_no_8: tst r2, #4 |
99 | beq .Linsb_no_4 | |
1da177e4 LT |
100 | |
101 | ldrb r3, [r0] | |
102 | ldrb r4, [r0] | |
103 | ldrb r5, [r0] | |
104 | ldrb r6, [r0] | |
105 | mov r3, r3, put_byte_0 | |
106 | orr r3, r3, r4, put_byte_1 | |
107 | orr r3, r3, r5, put_byte_2 | |
108 | orr r3, r3, r6, put_byte_3 | |
109 | str r3, [r1], #4 | |
110 | ||
a9c4814d | 111 | .Linsb_no_4: ands r2, r2, #3 |
e44fc388 | 112 | ldmfdeq sp!, {r4 - r6, pc} |
1da177e4 LT |
113 | |
114 | cmp r2, #2 | |
115 | ldrb r3, [r0] | |
116 | strb r3, [r1], #1 | |
e44fc388 SA |
117 | ldrbge r3, [r0] |
118 | strbge r3, [r1], #1 | |
119 | ldrbgt r3, [r0] | |
120 | strbgt r3, [r1] | |
1da177e4 | 121 | |
1b93a717 | 122 | ldmfd sp!, {r4 - r6, pc} |
93ed3970 | 123 | ENDPROC(__raw_readsb) |