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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/lib/io-writesw-armv4.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 LT |
13 | |
14 | .macro outword, rd | |
15 | #ifndef __ARMEB__ | |
16 | strh \rd, [r0] | |
17 | mov \rd, \rd, lsr #16 | |
18 | strh \rd, [r0] | |
19 | #else | |
20 | mov lr, \rd, lsr #16 | |
21 | strh lr, [r0] | |
22 | strh \rd, [r0] | |
23 | #endif | |
24 | .endm | |
25 | ||
a9c4814d NP |
26 | .Loutsw_align: movs ip, r1, lsl #31 |
27 | bne .Loutsw_noalign | |
1da177e4 LT |
28 | |
29 | ldrh r3, [r1], #2 | |
30 | sub r2, r2, #1 | |
31 | strh r3, [r0] | |
32 | ||
33 | ENTRY(__raw_writesw) | |
34 | teq r2, #0 | |
6ebbf2ce | 35 | reteq lr |
1da177e4 | 36 | ands r3, r1, #3 |
a9c4814d | 37 | bne .Loutsw_align |
1da177e4 LT |
38 | |
39 | stmfd sp!, {r4, r5, lr} | |
40 | ||
41 | subs r2, r2, #8 | |
a9c4814d | 42 | bmi .Lno_outsw_8 |
1da177e4 | 43 | |
a9c4814d | 44 | .Loutsw_8_lp: ldmia r1!, {r3, r4, r5, ip} |
1da177e4 LT |
45 | subs r2, r2, #8 |
46 | outword r3 | |
47 | outword r4 | |
48 | outword r5 | |
49 | outword ip | |
a9c4814d | 50 | bpl .Loutsw_8_lp |
1da177e4 | 51 | |
a9c4814d NP |
52 | .Lno_outsw_8: tst r2, #4 |
53 | beq .Lno_outsw_4 | |
1da177e4 LT |
54 | |
55 | ldmia r1!, {r3, ip} | |
56 | outword r3 | |
57 | outword ip | |
58 | ||
a9c4814d NP |
59 | .Lno_outsw_4: movs r2, r2, lsl #31 |
60 | bcc .Lno_outsw_2 | |
1da177e4 LT |
61 | |
62 | ldr r3, [r1], #4 | |
63 | outword r3 | |
64 | ||
a9c4814d | 65 | .Lno_outsw_2: ldrneh r3, [r1] |
1da177e4 LT |
66 | strneh r3, [r0] |
67 | ||
68 | ldmfd sp!, {r4, r5, pc} | |
69 | ||
70 | #ifdef __ARMEB__ | |
71 | #define pull_hbyte0 lsl #8 | |
72 | #define push_hbyte1 lsr #24 | |
73 | #else | |
74 | #define pull_hbyte0 lsr #24 | |
75 | #define push_hbyte1 lsl #8 | |
76 | #endif | |
77 | ||
a9c4814d | 78 | .Loutsw_noalign: |
8b592783 CM |
79 | ARM( ldr r3, [r1, -r3]! ) |
80 | THUMB( rsb r3, r3, #0 ) | |
81 | THUMB( ldr r3, [r1, r3] ) | |
82 | THUMB( sub r1, r3 ) | |
1da177e4 LT |
83 | subcs r2, r2, #1 |
84 | bcs 2f | |
85 | subs r2, r2, #2 | |
86 | bmi 3f | |
87 | ||
88 | 1: mov ip, r3, lsr #8 | |
89 | strh ip, [r0] | |
90 | 2: mov ip, r3, pull_hbyte0 | |
91 | ldr r3, [r1, #4]! | |
92 | subs r2, r2, #2 | |
93 | orr ip, ip, r3, push_hbyte1 | |
94 | strh ip, [r0] | |
aeabbbbe | 95 | bpl 1b |
1da177e4 | 96 | |
aeabbbbe NP |
97 | tst r2, #1 |
98 | 3: movne ip, r3, lsr #8 | |
1da177e4 | 99 | strneh ip, [r0] |
6ebbf2ce | 100 | ret lr |
93ed3970 | 101 | ENDPROC(__raw_writesw) |
4dd1837d | 102 | EXPORT_SYMBOL(__raw_writesw) |