88487c8c4f2353f7f512bd6dbecb019e93e72004
[sfrench/cifs-2.6.git] / arch / arm / lib / io-readsw-armv3.S
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>
12
13 .Linsw_bad_alignment:
14                 adr     r0, .Linsw_bad_align_msg
15                 mov     r2, lr
16                 b       panic
17 .Linsw_bad_align_msg:
18                 .asciz  "insw: bad buffer alignment (0x%p, lr=0x%08lX)\n"
19                 .align
20
21 .Linsw_align:   tst     r1, #1
22                 bne     .Linsw_bad_alignment
23
24                 ldr     r3, [r0]
25                 strb    r3, [r1], #1
26                 mov     r3, r3, lsr #8
27                 strb    r3, [r1], #1
28
29                 subs    r2, r2, #1
30                 moveq   pc, lr
31
32 ENTRY(__raw_readsw)
33                 teq     r2, #0          @ do we have to check for the zero len?
34                 moveq   pc, lr
35                 tst     r1, #3
36                 bne     .Linsw_align
37
38 .Linsw_aligned: mov     ip, #0xff
39                 orr     ip, ip, ip, lsl #8
40                 stmfd   sp!, {r4, r5, r6, lr}
41
42                 subs    r2, r2, #8
43                 bmi     .Lno_insw_8
44
45 .Linsw_8_lp:    ldr     r3, [r0]
46                 and     r3, r3, ip
47                 ldr     r4, [r0]
48                 orr     r3, r3, r4, lsl #16
49
50                 ldr     r4, [r0]
51                 and     r4, r4, ip
52                 ldr     r5, [r0]
53                 orr     r4, r4, r5, lsl #16
54
55                 ldr     r5, [r0]
56                 and     r5, r5, ip
57                 ldr     r6, [r0]
58                 orr     r5, r5, r6, lsl #16
59
60                 ldr     r6, [r0]
61                 and     r6, r6, ip
62                 ldr     lr, [r0]
63                 orr     r6, r6, lr, lsl #16
64
65                 stmia   r1!, {r3 - r6}
66
67                 subs    r2, r2, #8
68                 bpl     .Linsw_8_lp
69
70                 tst     r2, #7
71                 ldmeqfd sp!, {r4, r5, r6, pc}
72
73 .Lno_insw_8:    tst     r2, #4
74                 beq     .Lno_insw_4
75
76                 ldr     r3, [r0]
77                 and     r3, r3, ip
78                 ldr     r4, [r0]
79                 orr     r3, r3, r4, lsl #16
80
81                 ldr     r4, [r0]
82                 and     r4, r4, ip
83                 ldr     r5, [r0]
84                 orr     r4, r4, r5, lsl #16
85
86                 stmia   r1!, {r3, r4}
87
88 .Lno_insw_4:    tst     r2, #2
89                 beq     .Lno_insw_2
90
91                 ldr     r3, [r0]
92                 and     r3, r3, ip
93                 ldr     r4, [r0]
94                 orr     r3, r3, r4, lsl #16
95
96                 str     r3, [r1], #4
97
98 .Lno_insw_2:    tst     r2, #1
99                 ldrne   r3, [r0]
100                 strneb  r3, [r1], #1
101                 movne   r3, r3, lsr #8
102                 strneb  r3, [r1]
103
104                 ldmfd   sp!, {r4, r5, r6, pc}
105
106