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