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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/lib/io-readsl.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 | ENTRY(__raw_readsl) | |
14 | teq r2, #0 @ do we have to check for the zero len? | |
6ebbf2ce | 15 | reteq lr |
1da177e4 LT |
16 | ands ip, r1, #3 |
17 | bne 3f | |
18 | ||
19 | subs r2, r2, #4 | |
20 | bmi 2f | |
21 | stmfd sp!, {r4, lr} | |
22 | 1: ldr r3, [r0, #0] | |
23 | ldr r4, [r0, #0] | |
24 | ldr ip, [r0, #0] | |
25 | ldr lr, [r0, #0] | |
26 | subs r2, r2, #4 | |
27 | stmia r1!, {r3, r4, ip, lr} | |
28 | bpl 1b | |
29 | ldmfd sp!, {r4, lr} | |
30 | 2: movs r2, r2, lsl #31 | |
31 | ldrcs r3, [r0, #0] | |
32 | ldrcs ip, [r0, #0] | |
33 | stmcsia r1!, {r3, ip} | |
34 | ldrne r3, [r0, #0] | |
35 | strne r3, [r1, #0] | |
6ebbf2ce | 36 | ret lr |
1da177e4 LT |
37 | |
38 | 3: ldr r3, [r0] | |
39 | cmp ip, #2 | |
40 | mov ip, r3, get_byte_0 | |
41 | strb ip, [r1], #1 | |
42 | bgt 6f | |
43 | mov ip, r3, get_byte_1 | |
44 | strb ip, [r1], #1 | |
45 | beq 5f | |
46 | mov ip, r3, get_byte_2 | |
47 | strb ip, [r1], #1 | |
48 | ||
49 | 4: subs r2, r2, #1 | |
d98b90ea | 50 | mov ip, r3, lspull #24 |
1da177e4 | 51 | ldrne r3, [r0] |
d98b90ea | 52 | orrne ip, ip, r3, lspush #8 |
1da177e4 LT |
53 | strne ip, [r1], #4 |
54 | bne 4b | |
55 | b 8f | |
56 | ||
57 | 5: subs r2, r2, #1 | |
d98b90ea | 58 | mov ip, r3, lspull #16 |
1da177e4 | 59 | ldrne r3, [r0] |
d98b90ea | 60 | orrne ip, ip, r3, lspush #16 |
1da177e4 LT |
61 | strne ip, [r1], #4 |
62 | bne 5b | |
63 | b 7f | |
64 | ||
65 | 6: subs r2, r2, #1 | |
d98b90ea | 66 | mov ip, r3, lspull #8 |
1da177e4 | 67 | ldrne r3, [r0] |
d98b90ea | 68 | orrne ip, ip, r3, lspush #24 |
1da177e4 LT |
69 | strne ip, [r1], #4 |
70 | bne 6b | |
71 | ||
72 | mov r3, ip, get_byte_2 | |
73 | strb r3, [r1, #2] | |
74 | 7: mov r3, ip, get_byte_1 | |
75 | strb r3, [r1, #1] | |
76 | 8: mov r3, ip, get_byte_0 | |
77 | strb r3, [r1, #0] | |
6ebbf2ce | 78 | ret lr |
93ed3970 | 79 | ENDPROC(__raw_readsl) |