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https://github.com/edk2-porting/linux-next.git
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67 lines
1.2 KiB
ArmAsm
67 lines
1.2 KiB
ArmAsm
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/*
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* linux/arch/arm/lib/io-writesl.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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ENTRY(__raw_writesl)
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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 3f
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subs r2, r2, #4
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bmi 2f
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stmfd sp!, {r4, lr}
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1: ldmia r1!, {r3, r4, ip, lr}
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subs r2, r2, #4
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str r3, [r0, #0]
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str r4, [r0, #0]
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str ip, [r0, #0]
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str lr, [r0, #0]
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bpl 1b
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ldmfd sp!, {r4, lr}
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2: movs r2, r2, lsl #31
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ldmcsia r1!, {r3, ip}
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strcs r3, [r0, #0]
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ldrne r3, [r1, #0]
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strcs ip, [r0, #0]
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strne r3, [r0, #0]
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mov pc, lr
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3: bic r1, r1, #3
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ldr r3, [r1], #4
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cmp ip, #2
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blt 5f
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bgt 6f
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4: mov ip, r3, pull #16
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ldr r3, [r1], #4
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subs r2, r2, #1
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orr ip, ip, r3, push #16
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str ip, [r0]
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bne 4b
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mov pc, lr
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5: mov ip, r3, pull #8
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ldr r3, [r1], #4
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subs r2, r2, #1
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orr ip, ip, r3, push #24
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str ip, [r0]
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bne 5b
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mov pc, lr
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6: mov ip, r3, pull #24
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ldr r3, [r1], #4
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subs r2, r2, #1
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orr ip, ip, r3, push #8
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str ip, [r0]
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bne 6b
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mov pc, lr
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