| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm26/lib/io-readsl.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 | #include <asm/hardware.h> |
| 13 | |
| 14 | /* |
| 15 | * Note that some reads can be aligned on half-word boundaries. |
| 16 | */ |
| 17 | ENTRY(__raw_readsl) |
| 18 | teq r2, #0 @ do we have to check for the zero len? |
| 19 | moveq pc, lr |
| 20 | ands ip, r1, #3 |
| 21 | bne 2f |
| 22 | |
| 23 | 1: ldr r3, [r0] |
| 24 | str r3, [r1], #4 |
| 25 | subs r2, r2, #1 |
| 26 | bne 1b |
| 27 | mov pc, lr |
| 28 | |
| 29 | 2: cmp ip, #2 |
| 30 | ldr ip, [r0] |
| 31 | blt 4f |
| 32 | bgt 6f |
| 33 | |
| 34 | strb ip, [r1], #1 |
| 35 | mov ip, ip, lsr #8 |
| 36 | strb ip, [r1], #1 |
| 37 | mov ip, ip, lsr #8 |
| 38 | 3: subs r2, r2, #1 |
| 39 | ldrne r3, [r0] |
| 40 | orrne ip, ip, r3, lsl #16 |
| 41 | strne ip, [r1], #4 |
| 42 | movne ip, r3, lsr #16 |
| 43 | bne 3b |
| 44 | strb ip, [r1], #1 |
| 45 | mov ip, ip, lsr #8 |
| 46 | strb ip, [r1], #1 |
| 47 | mov pc, lr |
| 48 | |
| 49 | 4: strb ip, [r1], #1 |
| 50 | mov ip, ip, lsr #8 |
| 51 | strb ip, [r1], #1 |
| 52 | mov ip, ip, lsr #8 |
| 53 | strb ip, [r1], #1 |
| 54 | mov ip, ip, lsr #8 |
| 55 | 5: subs r2, r2, #1 |
| 56 | ldrne r3, [r0] |
| 57 | orrne ip, ip, r3, lsl #8 |
| 58 | strne ip, [r1], #4 |
| 59 | movne ip, r3, lsr #24 |
| 60 | bne 5b |
| 61 | strb ip, [r1], #1 |
| 62 | mov pc, lr |
| 63 | |
| 64 | 6: strb ip, [r1], #1 |
| 65 | mov ip, ip, lsr #8 |
| 66 | 7: subs r2, r2, #1 |
| 67 | ldrne r3, [r0] |
| 68 | orrne ip, ip, r3, lsl #24 |
| 69 | strne ip, [r1], #4 |
| 70 | movne ip, r3, lsr #8 |
| 71 | bne 7b |
| 72 | strb ip, [r1], #1 |
| 73 | mov ip, ip, lsr #8 |
| 74 | strb ip, [r1], #1 |
| 75 | mov ip, ip, lsr #8 |
| 76 | strb ip, [r1], #1 |
| 77 | mov pc, lr |
| 78 | |