| /* | |
| * 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 | |