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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> | |
4dd1837d | 12 | #include <asm/export.h> |
1da177e4 LT |
13 | |
14 | .macro pack, rd, hw1, hw2 | |
15 | #ifndef __ARMEB__ | |
16 | orr \rd, \hw1, \hw2, lsl #16 | |
17 | #else | |
18 | orr \rd, \hw2, \hw1, lsl #16 | |
19 | #endif | |
20 | .endm | |
21 | ||
a9c4814d NP |
22 | .Linsw_align: movs ip, r1, lsl #31 |
23 | bne .Linsw_noalign | |
1da177e4 LT |
24 | ldrh ip, [r0] |
25 | sub r2, r2, #1 | |
26 | strh ip, [r1], #2 | |
27 | ||
28 | ENTRY(__raw_readsw) | |
29 | teq r2, #0 | |
6ebbf2ce | 30 | reteq lr |
1da177e4 | 31 | tst r1, #3 |
a9c4814d | 32 | bne .Linsw_align |
1da177e4 LT |
33 | |
34 | stmfd sp!, {r4, r5, lr} | |
35 | ||
36 | subs r2, r2, #8 | |
a9c4814d | 37 | bmi .Lno_insw_8 |
1da177e4 | 38 | |
a9c4814d | 39 | .Linsw_8_lp: ldrh r3, [r0] |
1da177e4 LT |
40 | ldrh r4, [r0] |
41 | pack r3, r3, r4 | |
42 | ||
43 | ldrh r4, [r0] | |
44 | ldrh r5, [r0] | |
45 | pack r4, r4, r5 | |
46 | ||
47 | ldrh r5, [r0] | |
48 | ldrh ip, [r0] | |
49 | pack r5, r5, ip | |
50 | ||
51 | ldrh ip, [r0] | |
52 | ldrh lr, [r0] | |
53 | pack ip, ip, lr | |
54 | ||
55 | subs r2, r2, #8 | |
56 | stmia r1!, {r3 - r5, ip} | |
a9c4814d | 57 | bpl .Linsw_8_lp |
1da177e4 | 58 | |
a9c4814d NP |
59 | .Lno_insw_8: tst r2, #4 |
60 | beq .Lno_insw_4 | |
1da177e4 LT |
61 | |
62 | ldrh r3, [r0] | |
63 | ldrh r4, [r0] | |
64 | pack r3, r3, r4 | |
65 | ||
66 | ldrh r4, [r0] | |
67 | ldrh ip, [r0] | |
68 | pack r4, r4, ip | |
69 | ||
70 | stmia r1!, {r3, r4} | |
71 | ||
a9c4814d NP |
72 | .Lno_insw_4: movs r2, r2, lsl #31 |
73 | bcc .Lno_insw_2 | |
1da177e4 LT |
74 | |
75 | ldrh r3, [r0] | |
76 | ldrh ip, [r0] | |
77 | pack r3, r3, ip | |
78 | str r3, [r1], #4 | |
79 | ||
a9c4814d | 80 | .Lno_insw_2: ldrneh r3, [r0] |
1da177e4 LT |
81 | strneh r3, [r1] |
82 | ||
83 | ldmfd sp!, {r4, r5, pc} | |
84 | ||
85 | #ifdef __ARMEB__ | |
86 | #define _BE_ONLY_(code...) code | |
87 | #define _LE_ONLY_(code...) | |
88 | #define push_hbyte0 lsr #8 | |
89 | #define pull_hbyte1 lsl #24 | |
90 | #else | |
91 | #define _BE_ONLY_(code...) | |
92 | #define _LE_ONLY_(code...) code | |
93 | #define push_hbyte0 lsl #24 | |
94 | #define pull_hbyte1 lsr #8 | |
95 | #endif | |
96 | ||
a9c4814d | 97 | .Linsw_noalign: stmfd sp!, {r4, lr} |
1da177e4 LT |
98 | ldrccb ip, [r1, #-1]! |
99 | bcc 1f | |
100 | ||
101 | ldrh ip, [r0] | |
102 | sub r2, r2, #1 | |
103 | _BE_ONLY_( mov ip, ip, ror #8 ) | |
104 | strb ip, [r1], #1 | |
105 | _LE_ONLY_( mov ip, ip, lsr #8 ) | |
106 | _BE_ONLY_( mov ip, ip, lsr #24 ) | |
107 | ||
108 | 1: subs r2, r2, #2 | |
109 | bmi 3f | |
110 | _BE_ONLY_( mov ip, ip, lsl #24 ) | |
111 | ||
112 | 2: ldrh r3, [r0] | |
113 | ldrh r4, [r0] | |
114 | subs r2, r2, #2 | |
115 | orr ip, ip, r3, lsl #8 | |
116 | orr ip, ip, r4, push_hbyte0 | |
117 | str ip, [r1], #4 | |
118 | mov ip, r4, pull_hbyte1 | |
119 | bpl 2b | |
120 | ||
121 | _BE_ONLY_( mov ip, ip, lsr #24 ) | |
122 | ||
123 | 3: tst r2, #1 | |
124 | strb ip, [r1], #1 | |
125 | ldrneh ip, [r0] | |
126 | _BE_ONLY_( movne ip, ip, ror #8 ) | |
127 | strneb ip, [r1], #1 | |
128 | _LE_ONLY_( movne ip, ip, lsr #8 ) | |
129 | _BE_ONLY_( movne ip, ip, lsr #24 ) | |
130 | strneb ip, [r1] | |
131 | ldmfd sp!, {r4, pc} | |
93ed3970 | 132 | ENDPROC(__raw_readsw) |
4dd1837d | 133 | EXPORT_SYMBOL(__raw_readsw) |