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97 lines
1.5 KiB
97 lines
1.5 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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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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#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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reteq 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: ldrhne r3, [r1] |
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strhne 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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strhne ip, [r0] |
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ret lr |
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ENDPROC(__raw_writesw)
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