projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * linux/arch/arm/lib/io-readsb.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 | ||
| a9c4814d | 13 | .Linsb_align: rsb ip, ip, #4 |
| 1da177e4 LT |
14 | cmp ip, r2 |
| 15 | movgt ip, r2 | |
| 16 | cmp ip, #2 | |
| 17 | ldrb r3, [r0] | |
| 18 | strb r3, [r1], #1 | |
| 19 | ldrgeb r3, [r0] | |
| 20 | strgeb r3, [r1], #1 | |
| 21 | ldrgtb r3, [r0] | |
| 22 | strgtb r3, [r1], #1 | |
| 23 | subs r2, r2, ip | |
| a9c4814d | 24 | bne .Linsb_aligned |
| 1da177e4 LT |
25 | |
| 26 | ENTRY(__raw_readsb) | |
| 27 | teq r2, #0 @ do we have to check for the zero len? | |
| 6ebbf2ce | 28 | reteq lr |
| 1da177e4 | 29 | ands ip, r1, #3 |
| a9c4814d | 30 | bne .Linsb_align |
| 1da177e4 | 31 | |
| a9c4814d | 32 | .Linsb_aligned: stmfd sp!, {r4 - r6, lr} |
| 1da177e4 LT |
33 | |
| 34 | subs r2, r2, #16 | |
| a9c4814d | 35 | bmi .Linsb_no_16 |
| 1da177e4 | 36 | |
| a9c4814d | 37 | .Linsb_16_lp: ldrb r3, [r0] |
| 1da177e4 LT |
38 | ldrb r4, [r0] |
| 39 | ldrb r5, [r0] | |
| 40 | mov r3, r3, put_byte_0 | |
| 41 | ldrb r6, [r0] | |
| 42 | orr r3, r3, r4, put_byte_1 | |
| 43 | ldrb r4, [r0] | |
| 44 | orr r3, r3, r5, put_byte_2 | |
| 45 | ldrb r5, [r0] | |
| 46 | orr r3, r3, r6, put_byte_3 | |
| 47 | ldrb r6, [r0] | |
| 48 | mov r4, r4, put_byte_0 | |
| 49 | ldrb ip, [r0] | |
| 50 | orr r4, r4, r5, put_byte_1 | |
| 51 | ldrb r5, [r0] | |
| 52 | orr r4, r4, r6, put_byte_2 | |
| 53 | ldrb r6, [r0] | |
| 54 | orr r4, r4, ip, put_byte_3 | |
| 55 | ldrb ip, [r0] | |
| 56 | mov r5, r5, put_byte_0 | |
| 57 | ldrb lr, [r0] | |
| 58 | orr r5, r5, r6, put_byte_1 | |
| 59 | ldrb r6, [r0] | |
| 60 | orr r5, r5, ip, put_byte_2 | |
| 61 | ldrb ip, [r0] | |
| 62 | orr r5, r5, lr, put_byte_3 | |
| 63 | ldrb lr, [r0] | |
| 64 | mov r6, r6, put_byte_0 | |
| 65 | orr r6, r6, ip, put_byte_1 | |
| 66 | ldrb ip, [r0] | |
| 67 | orr r6, r6, lr, put_byte_2 | |
| 68 | orr r6, r6, ip, put_byte_3 | |
| 69 | stmia r1!, {r3 - r6} | |
| 70 | ||
| 71 | subs r2, r2, #16 | |
| a9c4814d | 72 | bpl .Linsb_16_lp |
| 1da177e4 LT |
73 | |
| 74 | tst r2, #15 | |
| 1b93a717 | 75 | ldmeqfd sp!, {r4 - r6, pc} |
| 1da177e4 | 76 | |
| a9c4814d NP |
77 | .Linsb_no_16: tst r2, #8 |
| 78 | beq .Linsb_no_8 | |
| 1da177e4 LT |
79 | |
| 80 | ldrb r3, [r0] | |
| 81 | ldrb r4, [r0] | |
| 82 | ldrb r5, [r0] | |
| 83 | mov r3, r3, put_byte_0 | |
| 84 | ldrb r6, [r0] | |
| 85 | orr r3, r3, r4, put_byte_1 | |
| 86 | ldrb r4, [r0] | |
| 87 | orr r3, r3, r5, put_byte_2 | |
| 88 | ldrb r5, [r0] | |
| 89 | orr r3, r3, r6, put_byte_3 | |
| 90 | ldrb r6, [r0] | |
| 91 | mov r4, r4, put_byte_0 | |
| 92 | ldrb ip, [r0] | |
| 93 | orr r4, r4, r5, put_byte_1 | |
| 94 | orr r4, r4, r6, put_byte_2 | |
| 95 | orr r4, r4, ip, put_byte_3 | |
| 96 | stmia r1!, {r3, r4} | |
| 97 | ||
| a9c4814d NP |
98 | .Linsb_no_8: tst r2, #4 |
| 99 | beq .Linsb_no_4 | |
| 1da177e4 LT |
100 | |
| 101 | ldrb r3, [r0] | |
| 102 | ldrb r4, [r0] | |
| 103 | ldrb r5, [r0] | |
| 104 | ldrb r6, [r0] | |
| 105 | mov r3, r3, put_byte_0 | |
| 106 | orr r3, r3, r4, put_byte_1 | |
| 107 | orr r3, r3, r5, put_byte_2 | |
| 108 | orr r3, r3, r6, put_byte_3 | |
| 109 | str r3, [r1], #4 | |
| 110 | ||
| a9c4814d | 111 | .Linsb_no_4: ands r2, r2, #3 |
| 1b93a717 | 112 | ldmeqfd sp!, {r4 - r6, pc} |
| 1da177e4 LT |
113 | |
| 114 | cmp r2, #2 | |
| 115 | ldrb r3, [r0] | |
| 116 | strb r3, [r1], #1 | |
| 117 | ldrgeb r3, [r0] | |
| 118 | strgeb r3, [r1], #1 | |
| 119 | ldrgtb r3, [r0] | |
| 120 | strgtb r3, [r1] | |
| 121 | ||
| 1b93a717 | 122 | ldmfd sp!, {r4 - r6, pc} |
| 93ed3970 | 123 | ENDPROC(__raw_readsb) |