101 lines
1.7 KiB
ArmAsm
101 lines
1.7 KiB
ArmAsm
/*
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* linux/arch/arm/lib/io-writesw-armv4.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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.macro outword, rd
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#ifndef __ARMEB__
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strh \rd, [r0]
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mov \rd, \rd, lsr #16
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strh \rd, [r0]
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#else
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mov lr, \rd, lsr #16
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strh lr, [r0]
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strh \rd, [r0]
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#endif
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.endm
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.Loutsw_align: movs ip, r1, lsl #31
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bne .Loutsw_noalign
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ldrh r3, [r1], #2
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sub r2, r2, #1
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strh r3, [r0]
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ENTRY(__raw_writesw)
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teq r2, #0
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moveq pc, lr
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ands r3, r1, #3
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bne .Loutsw_align
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stmfd sp!, {r4, r5, lr}
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subs r2, r2, #8
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bmi .Lno_outsw_8
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.Loutsw_8_lp: ldmia r1!, {r3, r4, r5, ip}
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subs r2, r2, #8
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outword r3
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outword r4
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outword r5
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outword ip
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bpl .Loutsw_8_lp
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.Lno_outsw_8: tst r2, #4
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beq .Lno_outsw_4
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ldmia r1!, {r3, ip}
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outword r3
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outword ip
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.Lno_outsw_4: movs r2, r2, lsl #31
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bcc .Lno_outsw_2
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ldr r3, [r1], #4
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outword r3
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.Lno_outsw_2: ldrneh r3, [r1]
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strneh r3, [r0]
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ldmfd sp!, {r4, r5, pc}
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#ifdef __ARMEB__
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#define pull_hbyte0 lsl #8
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#define push_hbyte1 lsr #24
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#else
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#define pull_hbyte0 lsr #24
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#define push_hbyte1 lsl #8
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#endif
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.Loutsw_noalign:
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ARM( ldr r3, [r1, -r3]! )
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THUMB( rsb r3, r3, #0 )
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THUMB( ldr r3, [r1, r3] )
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THUMB( sub r1, r3 )
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subcs r2, r2, #1
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bcs 2f
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subs r2, r2, #2
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bmi 3f
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1: mov ip, r3, lsr #8
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strh ip, [r0]
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2: mov ip, r3, pull_hbyte0
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ldr r3, [r1, #4]!
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subs r2, r2, #2
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orr ip, ip, r3, push_hbyte1
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strh ip, [r0]
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bpl 1b
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tst r2, #1
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3: movne ip, r3, lsr #8
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strneh ip, [r0]
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mov pc, lr
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ENDPROC(__raw_writesw)
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