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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> | |
4dd1837d | 12 | #include <asm/export.h> |
1da177e4 | 13 | |
a9c4814d | 14 | .Linsb_align: rsb ip, ip, #4 |
1da177e4 LT |
15 | cmp ip, r2 |
16 | movgt ip, r2 | |
17 | cmp ip, #2 | |
18 | ldrb r3, [r0] | |
19 | strb r3, [r1], #1 | |
20 | ldrgeb r3, [r0] | |
21 | strgeb r3, [r1], #1 | |
22 | ldrgtb r3, [r0] | |
23 | strgtb r3, [r1], #1 | |
24 | subs r2, r2, ip | |
a9c4814d | 25 | bne .Linsb_aligned |
1da177e4 LT |
26 | |
27 | ENTRY(__raw_readsb) | |
28 | teq r2, #0 @ do we have to check for the zero len? | |
6ebbf2ce | 29 | reteq lr |
1da177e4 | 30 | ands ip, r1, #3 |
a9c4814d | 31 | bne .Linsb_align |
1da177e4 | 32 | |
a9c4814d | 33 | .Linsb_aligned: stmfd sp!, {r4 - r6, lr} |
1da177e4 LT |
34 | |
35 | subs r2, r2, #16 | |
a9c4814d | 36 | bmi .Linsb_no_16 |
1da177e4 | 37 | |
a9c4814d | 38 | .Linsb_16_lp: ldrb r3, [r0] |
1da177e4 LT |
39 | ldrb r4, [r0] |
40 | ldrb r5, [r0] | |
41 | mov r3, r3, put_byte_0 | |
42 | ldrb r6, [r0] | |
43 | orr r3, r3, r4, put_byte_1 | |
44 | ldrb r4, [r0] | |
45 | orr r3, r3, r5, put_byte_2 | |
46 | ldrb r5, [r0] | |
47 | orr r3, r3, r6, put_byte_3 | |
48 | ldrb r6, [r0] | |
49 | mov r4, r4, put_byte_0 | |
50 | ldrb ip, [r0] | |
51 | orr r4, r4, r5, put_byte_1 | |
52 | ldrb r5, [r0] | |
53 | orr r4, r4, r6, put_byte_2 | |
54 | ldrb r6, [r0] | |
55 | orr r4, r4, ip, put_byte_3 | |
56 | ldrb ip, [r0] | |
57 | mov r5, r5, put_byte_0 | |
58 | ldrb lr, [r0] | |
59 | orr r5, r5, r6, put_byte_1 | |
60 | ldrb r6, [r0] | |
61 | orr r5, r5, ip, put_byte_2 | |
62 | ldrb ip, [r0] | |
63 | orr r5, r5, lr, put_byte_3 | |
64 | ldrb lr, [r0] | |
65 | mov r6, r6, put_byte_0 | |
66 | orr r6, r6, ip, put_byte_1 | |
67 | ldrb ip, [r0] | |
68 | orr r6, r6, lr, put_byte_2 | |
69 | orr r6, r6, ip, put_byte_3 | |
70 | stmia r1!, {r3 - r6} | |
71 | ||
72 | subs r2, r2, #16 | |
a9c4814d | 73 | bpl .Linsb_16_lp |
1da177e4 LT |
74 | |
75 | tst r2, #15 | |
1b93a717 | 76 | ldmeqfd sp!, {r4 - r6, pc} |
1da177e4 | 77 | |
a9c4814d NP |
78 | .Linsb_no_16: tst r2, #8 |
79 | beq .Linsb_no_8 | |
1da177e4 LT |
80 | |
81 | ldrb r3, [r0] | |
82 | ldrb r4, [r0] | |
83 | ldrb r5, [r0] | |
84 | mov r3, r3, put_byte_0 | |
85 | ldrb r6, [r0] | |
86 | orr r3, r3, r4, put_byte_1 | |
87 | ldrb r4, [r0] | |
88 | orr r3, r3, r5, put_byte_2 | |
89 | ldrb r5, [r0] | |
90 | orr r3, r3, r6, put_byte_3 | |
91 | ldrb r6, [r0] | |
92 | mov r4, r4, put_byte_0 | |
93 | ldrb ip, [r0] | |
94 | orr r4, r4, r5, put_byte_1 | |
95 | orr r4, r4, r6, put_byte_2 | |
96 | orr r4, r4, ip, put_byte_3 | |
97 | stmia r1!, {r3, r4} | |
98 | ||
a9c4814d NP |
99 | .Linsb_no_8: tst r2, #4 |
100 | beq .Linsb_no_4 | |
1da177e4 LT |
101 | |
102 | ldrb r3, [r0] | |
103 | ldrb r4, [r0] | |
104 | ldrb r5, [r0] | |
105 | ldrb r6, [r0] | |
106 | mov r3, r3, put_byte_0 | |
107 | orr r3, r3, r4, put_byte_1 | |
108 | orr r3, r3, r5, put_byte_2 | |
109 | orr r3, r3, r6, put_byte_3 | |
110 | str r3, [r1], #4 | |
111 | ||
a9c4814d | 112 | .Linsb_no_4: ands r2, r2, #3 |
1b93a717 | 113 | ldmeqfd sp!, {r4 - r6, pc} |
1da177e4 LT |
114 | |
115 | cmp r2, #2 | |
116 | ldrb r3, [r0] | |
117 | strb r3, [r1], #1 | |
118 | ldrgeb r3, [r0] | |
119 | strgeb r3, [r1], #1 | |
120 | ldrgtb r3, [r0] | |
121 | strgtb r3, [r1] | |
122 | ||
1b93a717 | 123 | ldmfd sp!, {r4 - r6, pc} |
93ed3970 | 124 | ENDPROC(__raw_readsb) |
4dd1837d | 125 | EXPORT_SYMBOL(__raw_readsb) |