| /* |
| * linux/arch/arm26/lib/io-readsl.S |
| * |
| * Copyright (C) 1995-2000 Russell King |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| #include <linux/linkage.h> |
| #include <asm/assembler.h> |
| #include <asm/hardware.h> |
| |
| /* |
| * Note that some reads can be aligned on half-word boundaries. |
| */ |
| ENTRY(__raw_readsl) |
| teq r2, #0 @ do we have to check for the zero len? |
| moveq pc, lr |
| ands ip, r1, #3 |
| bne 2f |
| |
| 1: ldr r3, [r0] |
| str r3, [r1], #4 |
| subs r2, r2, #1 |
| bne 1b |
| mov pc, lr |
| |
| 2: cmp ip, #2 |
| ldr ip, [r0] |
| blt 4f |
| bgt 6f |
| |
| strb ip, [r1], #1 |
| mov ip, ip, lsr #8 |
| strb ip, [r1], #1 |
| mov ip, ip, lsr #8 |
| 3: subs r2, r2, #1 |
| ldrne r3, [r0] |
| orrne ip, ip, r3, lsl #16 |
| strne ip, [r1], #4 |
| movne ip, r3, lsr #16 |
| bne 3b |
| strb ip, [r1], #1 |
| mov ip, ip, lsr #8 |
| strb ip, [r1], #1 |
| mov pc, lr |
| |
| 4: strb ip, [r1], #1 |
| mov ip, ip, lsr #8 |
| strb ip, [r1], #1 |
| mov ip, ip, lsr #8 |
| strb ip, [r1], #1 |
| mov ip, ip, lsr #8 |
| 5: subs r2, r2, #1 |
| ldrne r3, [r0] |
| orrne ip, ip, r3, lsl #8 |
| strne ip, [r1], #4 |
| movne ip, r3, lsr #24 |
| bne 5b |
| strb ip, [r1], #1 |
| mov pc, lr |
| |
| 6: strb ip, [r1], #1 |
| mov ip, ip, lsr #8 |
| 7: subs r2, r2, #1 |
| ldrne r3, [r0] |
| orrne ip, ip, r3, lsl #24 |
| strne ip, [r1], #4 |
| movne ip, r3, lsr #8 |
| bne 7b |
| strb ip, [r1], #1 |
| mov ip, ip, lsr #8 |
| strb ip, [r1], #1 |
| mov ip, ip, lsr #8 |
| strb ip, [r1], #1 |
| mov pc, lr |
| |