132 строки
2.3 KiB
ArmAsm
132 строки
2.3 KiB
ArmAsm
/*
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* linux/arch/arm/lib/io-readsw-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 pack, rd, hw1, hw2
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#ifndef __ARMEB__
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orr \rd, \hw1, \hw2, lsl #16
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#else
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orr \rd, \hw2, \hw1, lsl #16
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#endif
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.endm
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.Linsw_align: movs ip, r1, lsl #31
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bne .Linsw_noalign
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ldrh ip, [r0]
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sub r2, r2, #1
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strh ip, [r1], #2
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ENTRY(__raw_readsw)
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teq r2, #0
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reteq lr
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tst r1, #3
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bne .Linsw_align
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stmfd sp!, {r4, r5, lr}
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subs r2, r2, #8
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bmi .Lno_insw_8
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.Linsw_8_lp: ldrh r3, [r0]
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ldrh r4, [r0]
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pack r3, r3, r4
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ldrh r4, [r0]
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ldrh r5, [r0]
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pack r4, r4, r5
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ldrh r5, [r0]
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ldrh ip, [r0]
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pack r5, r5, ip
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ldrh ip, [r0]
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ldrh lr, [r0]
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pack ip, ip, lr
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subs r2, r2, #8
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stmia r1!, {r3 - r5, ip}
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bpl .Linsw_8_lp
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.Lno_insw_8: tst r2, #4
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beq .Lno_insw_4
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ldrh r3, [r0]
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ldrh r4, [r0]
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pack r3, r3, r4
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ldrh r4, [r0]
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ldrh ip, [r0]
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pack r4, r4, ip
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stmia r1!, {r3, r4}
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.Lno_insw_4: movs r2, r2, lsl #31
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bcc .Lno_insw_2
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ldrh r3, [r0]
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ldrh ip, [r0]
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pack r3, r3, ip
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str r3, [r1], #4
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.Lno_insw_2: ldrneh r3, [r0]
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strneh r3, [r1]
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ldmfd sp!, {r4, r5, pc}
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#ifdef __ARMEB__
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#define _BE_ONLY_(code...) code
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#define _LE_ONLY_(code...)
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#define push_hbyte0 lsr #8
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#define pull_hbyte1 lsl #24
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#else
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#define _BE_ONLY_(code...)
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#define _LE_ONLY_(code...) code
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#define push_hbyte0 lsl #24
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#define pull_hbyte1 lsr #8
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#endif
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.Linsw_noalign: stmfd sp!, {r4, lr}
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ldrccb ip, [r1, #-1]!
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bcc 1f
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ldrh ip, [r0]
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sub r2, r2, #1
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_BE_ONLY_( mov ip, ip, ror #8 )
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strb ip, [r1], #1
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_LE_ONLY_( mov ip, ip, lsr #8 )
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_BE_ONLY_( mov ip, ip, lsr #24 )
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1: subs r2, r2, #2
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bmi 3f
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_BE_ONLY_( mov ip, ip, lsl #24 )
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2: ldrh r3, [r0]
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ldrh r4, [r0]
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subs r2, r2, #2
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orr ip, ip, r3, lsl #8
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orr ip, ip, r4, push_hbyte0
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str ip, [r1], #4
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mov ip, r4, pull_hbyte1
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bpl 2b
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_BE_ONLY_( mov ip, ip, lsr #24 )
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3: tst r2, #1
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strb ip, [r1], #1
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ldrneh ip, [r0]
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_BE_ONLY_( movne ip, ip, ror #8 )
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strneb ip, [r1], #1
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_LE_ONLY_( movne ip, ip, lsr #8 )
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_BE_ONLY_( movne ip, ip, lsr #24 )
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strneb ip, [r1]
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ldmfd sp!, {r4, pc}
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ENDPROC(__raw_readsw)
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