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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/lib/io-readsw-armv3.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> | |
a09e64fb | 12 | #include <mach/hardware.h> |
1da177e4 | 13 | |
a9c4814d NP |
14 | .Linsw_bad_alignment: |
15 | adr r0, .Linsw_bad_align_msg | |
1da177e4 LT |
16 | mov r2, lr |
17 | b panic | |
a9c4814d | 18 | .Linsw_bad_align_msg: |
1da177e4 LT |
19 | .asciz "insw: bad buffer alignment (0x%p, lr=0x%08lX)\n" |
20 | .align | |
21 | ||
a9c4814d NP |
22 | .Linsw_align: tst r1, #1 |
23 | bne .Linsw_bad_alignment | |
1da177e4 LT |
24 | |
25 | ldr r3, [r0] | |
26 | strb r3, [r1], #1 | |
27 | mov r3, r3, lsr #8 | |
28 | strb r3, [r1], #1 | |
29 | ||
30 | subs r2, r2, #1 | |
7999d8d7 | 31 | moveq pc, lr |
1da177e4 LT |
32 | |
33 | ENTRY(__raw_readsw) | |
34 | teq r2, #0 @ do we have to check for the zero len? | |
35 | moveq pc, lr | |
36 | tst r1, #3 | |
a9c4814d | 37 | bne .Linsw_align |
1da177e4 | 38 | |
a9c4814d | 39 | .Linsw_aligned: mov ip, #0xff |
1da177e4 LT |
40 | orr ip, ip, ip, lsl #8 |
41 | stmfd sp!, {r4, r5, r6, lr} | |
42 | ||
43 | subs r2, r2, #8 | |
a9c4814d | 44 | bmi .Lno_insw_8 |
1da177e4 | 45 | |
a9c4814d | 46 | .Linsw_8_lp: ldr r3, [r0] |
1da177e4 LT |
47 | and r3, r3, ip |
48 | ldr r4, [r0] | |
49 | orr r3, r3, r4, lsl #16 | |
50 | ||
51 | ldr r4, [r0] | |
52 | and r4, r4, ip | |
53 | ldr r5, [r0] | |
54 | orr r4, r4, r5, lsl #16 | |
55 | ||
56 | ldr r5, [r0] | |
57 | and r5, r5, ip | |
58 | ldr r6, [r0] | |
59 | orr r5, r5, r6, lsl #16 | |
60 | ||
61 | ldr r6, [r0] | |
62 | and r6, r6, ip | |
63 | ldr lr, [r0] | |
64 | orr r6, r6, lr, lsl #16 | |
65 | ||
66 | stmia r1!, {r3 - r6} | |
67 | ||
68 | subs r2, r2, #8 | |
a9c4814d | 69 | bpl .Linsw_8_lp |
1da177e4 LT |
70 | |
71 | tst r2, #7 | |
1b93a717 | 72 | ldmeqfd sp!, {r4, r5, r6, pc} |
1da177e4 | 73 | |
a9c4814d NP |
74 | .Lno_insw_8: tst r2, #4 |
75 | beq .Lno_insw_4 | |
1da177e4 LT |
76 | |
77 | ldr r3, [r0] | |
78 | and r3, r3, ip | |
79 | ldr r4, [r0] | |
80 | orr r3, r3, r4, lsl #16 | |
81 | ||
82 | ldr r4, [r0] | |
83 | and r4, r4, ip | |
84 | ldr r5, [r0] | |
85 | orr r4, r4, r5, lsl #16 | |
86 | ||
87 | stmia r1!, {r3, r4} | |
88 | ||
a9c4814d NP |
89 | .Lno_insw_4: tst r2, #2 |
90 | beq .Lno_insw_2 | |
1da177e4 LT |
91 | |
92 | ldr r3, [r0] | |
93 | and r3, r3, ip | |
94 | ldr r4, [r0] | |
95 | orr r3, r3, r4, lsl #16 | |
96 | ||
97 | str r3, [r1], #4 | |
98 | ||
a9c4814d | 99 | .Lno_insw_2: tst r2, #1 |
1da177e4 LT |
100 | ldrne r3, [r0] |
101 | strneb r3, [r1], #1 | |
102 | movne r3, r3, lsr #8 | |
103 | strneb r3, [r1] | |
104 | ||
1b93a717 | 105 | ldmfd sp!, {r4, r5, r6, pc} |
1da177e4 LT |
106 | |
107 |