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1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/lib/io-readsw-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 pack, rd, hw1, hw2 | |
14 | #ifndef __ARMEB__ | |
15 | orr \rd, \hw1, \hw2, lsl #16 | |
16 | #else | |
17 | orr \rd, \hw2, \hw1, lsl #16 | |
18 | #endif | |
19 | .endm | |
20 | ||
a9c4814d NP |
21 | .Linsw_align: movs ip, r1, lsl #31 |
22 | bne .Linsw_noalign | |
1da177e4 LT |
23 | ldrh ip, [r0] |
24 | sub r2, r2, #1 | |
25 | strh ip, [r1], #2 | |
26 | ||
27 | ENTRY(__raw_readsw) | |
28 | teq r2, #0 | |
6ebbf2ce | 29 | reteq lr |
1da177e4 | 30 | tst r1, #3 |
a9c4814d | 31 | bne .Linsw_align |
1da177e4 LT |
32 | |
33 | stmfd sp!, {r4, r5, lr} | |
34 | ||
35 | subs r2, r2, #8 | |
a9c4814d | 36 | bmi .Lno_insw_8 |
1da177e4 | 37 | |
a9c4814d | 38 | .Linsw_8_lp: ldrh r3, [r0] |
1da177e4 LT |
39 | ldrh r4, [r0] |
40 | pack r3, r3, r4 | |
41 | ||
42 | ldrh r4, [r0] | |
43 | ldrh r5, [r0] | |
44 | pack r4, r4, r5 | |
45 | ||
46 | ldrh r5, [r0] | |
47 | ldrh ip, [r0] | |
48 | pack r5, r5, ip | |
49 | ||
50 | ldrh ip, [r0] | |
51 | ldrh lr, [r0] | |
52 | pack ip, ip, lr | |
53 | ||
54 | subs r2, r2, #8 | |
55 | stmia r1!, {r3 - r5, ip} | |
a9c4814d | 56 | bpl .Linsw_8_lp |
1da177e4 | 57 | |
a9c4814d NP |
58 | .Lno_insw_8: tst r2, #4 |
59 | beq .Lno_insw_4 | |
1da177e4 LT |
60 | |
61 | ldrh r3, [r0] | |
62 | ldrh r4, [r0] | |
63 | pack r3, r3, r4 | |
64 | ||
65 | ldrh r4, [r0] | |
66 | ldrh ip, [r0] | |
67 | pack r4, r4, ip | |
68 | ||
69 | stmia r1!, {r3, r4} | |
70 | ||
a9c4814d NP |
71 | .Lno_insw_4: movs r2, r2, lsl #31 |
72 | bcc .Lno_insw_2 | |
1da177e4 LT |
73 | |
74 | ldrh r3, [r0] | |
75 | ldrh ip, [r0] | |
76 | pack r3, r3, ip | |
77 | str r3, [r1], #4 | |
78 | ||
a9c4814d | 79 | .Lno_insw_2: ldrneh r3, [r0] |
1da177e4 LT |
80 | strneh r3, [r1] |
81 | ||
82 | ldmfd sp!, {r4, r5, pc} | |
83 | ||
84 | #ifdef __ARMEB__ | |
85 | #define _BE_ONLY_(code...) code | |
86 | #define _LE_ONLY_(code...) | |
87 | #define push_hbyte0 lsr #8 | |
88 | #define pull_hbyte1 lsl #24 | |
89 | #else | |
90 | #define _BE_ONLY_(code...) | |
91 | #define _LE_ONLY_(code...) code | |
92 | #define push_hbyte0 lsl #24 | |
93 | #define pull_hbyte1 lsr #8 | |
94 | #endif | |
95 | ||
a9c4814d | 96 | .Linsw_noalign: stmfd sp!, {r4, lr} |
1da177e4 LT |
97 | ldrccb ip, [r1, #-1]! |
98 | bcc 1f | |
99 | ||
100 | ldrh ip, [r0] | |
101 | sub r2, r2, #1 | |
102 | _BE_ONLY_( mov ip, ip, ror #8 ) | |
103 | strb ip, [r1], #1 | |
104 | _LE_ONLY_( mov ip, ip, lsr #8 ) | |
105 | _BE_ONLY_( mov ip, ip, lsr #24 ) | |
106 | ||
107 | 1: subs r2, r2, #2 | |
108 | bmi 3f | |
109 | _BE_ONLY_( mov ip, ip, lsl #24 ) | |
110 | ||
111 | 2: ldrh r3, [r0] | |
112 | ldrh r4, [r0] | |
113 | subs r2, r2, #2 | |
114 | orr ip, ip, r3, lsl #8 | |
115 | orr ip, ip, r4, push_hbyte0 | |
116 | str ip, [r1], #4 | |
117 | mov ip, r4, pull_hbyte1 | |
118 | bpl 2b | |
119 | ||
120 | _BE_ONLY_( mov ip, ip, lsr #24 ) | |
121 | ||
122 | 3: tst r2, #1 | |
123 | strb ip, [r1], #1 | |
124 | ldrneh ip, [r0] | |
125 | _BE_ONLY_( movne ip, ip, ror #8 ) | |
126 | strneb ip, [r1], #1 | |
127 | _LE_ONLY_( movne ip, ip, lsr #8 ) | |
128 | _BE_ONLY_( movne ip, ip, lsr #24 ) | |
129 | strneb ip, [r1] | |
130 | ldmfd sp!, {r4, pc} | |
93ed3970 | 131 | ENDPROC(__raw_readsw) |