projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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) |