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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> | |
12 | ||
13 | .macro outword, rd | |
14 | #ifndef __ARMEB__ | |
15 | strh \rd, [r0] | |
16 | mov \rd, \rd, lsr #16 | |
17 | strh \rd, [r0] | |
18 | #else | |
19 | mov lr, \rd, lsr #16 | |
20 | strh lr, [r0] | |
21 | strh \rd, [r0] | |
22 | #endif | |
23 | .endm | |
24 | ||
25 | .outsw_align: movs ip, r1, lsl #31 | |
26 | bne .outsw_noalign | |
27 | ||
28 | ldrh r3, [r1], #2 | |
29 | sub r2, r2, #1 | |
30 | strh r3, [r0] | |
31 | ||
32 | ENTRY(__raw_writesw) | |
33 | teq r2, #0 | |
34 | moveq pc, lr | |
35 | ands r3, r1, #3 | |
36 | bne .outsw_align | |
37 | ||
38 | stmfd sp!, {r4, r5, lr} | |
39 | ||
40 | subs r2, r2, #8 | |
41 | bmi .no_outsw_8 | |
42 | ||
43 | .outsw_8_lp: ldmia r1!, {r3, r4, r5, ip} | |
44 | subs r2, r2, #8 | |
45 | outword r3 | |
46 | outword r4 | |
47 | outword r5 | |
48 | outword ip | |
49 | bpl .outsw_8_lp | |
50 | ||
51 | .no_outsw_8: tst r2, #4 | |
52 | beq .no_outsw_4 | |
53 | ||
54 | ldmia r1!, {r3, ip} | |
55 | outword r3 | |
56 | outword ip | |
57 | ||
58 | .no_outsw_4: movs r2, r2, lsl #31 | |
59 | bcc .no_outsw_2 | |
60 | ||
61 | ldr r3, [r1], #4 | |
62 | outword r3 | |
63 | ||
64 | .no_outsw_2: ldrneh r3, [r1] | |
65 | strneh r3, [r0] | |
66 | ||
67 | ldmfd sp!, {r4, r5, pc} | |
68 | ||
69 | #ifdef __ARMEB__ | |
70 | #define pull_hbyte0 lsl #8 | |
71 | #define push_hbyte1 lsr #24 | |
72 | #else | |
73 | #define pull_hbyte0 lsr #24 | |
74 | #define push_hbyte1 lsl #8 | |
75 | #endif | |
76 | ||
77 | .outsw_noalign: ldr r3, [r1, -r3]! | |
78 | subcs r2, r2, #1 | |
79 | bcs 2f | |
80 | subs r2, r2, #2 | |
81 | bmi 3f | |
82 | ||
83 | 1: mov ip, r3, lsr #8 | |
84 | strh ip, [r0] | |
85 | 2: mov ip, r3, pull_hbyte0 | |
86 | ldr r3, [r1, #4]! | |
87 | subs r2, r2, #2 | |
88 | orr ip, ip, r3, push_hbyte1 | |
89 | strh ip, [r0] | |
90 | bpl 2b | |
91 | ||
92 | 3: tst r2, #1 | |
93 | 2: movne ip, r3, lsr #8 | |
94 | strneh ip, [r0] | |
95 | mov pc, lr |