Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
[linux-2.6] / arch / arm / lib / io-readsl.S
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?
15                 moveq   pc, lr
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]
36                 mov     pc, lr
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
50                 mov     ip, r3, pull #24
51                 ldrne   r3, [r0]
52                 orrne   ip, ip, r3, push #8
53                 strne   ip, [r1], #4
54                 bne     4b
55                 b       8f
56
57 5:              subs    r2, r2, #1
58                 mov     ip, r3, pull #16
59                 ldrne   r3, [r0]
60                 orrne   ip, ip, r3, push #16
61                 strne   ip, [r1], #4
62                 bne     5b
63                 b       7f
64
65 6:              subs    r2, r2, #1
66                 mov     ip, r3, pull #8
67                 ldrne   r3, [r0]
68                 orrne   ip, ip, r3, push #24
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]
78                 mov     pc, lr
79 ENDPROC(__raw_readsl)