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91 lines
1.5 KiB
91 lines
1.5 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* linux/arch/arm/lib/io-writesb.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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strb \rd, [r0] |
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mov \rd, \rd, lsr #8 |
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strb \rd, [r0] |
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mov \rd, \rd, lsr #8 |
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strb \rd, [r0] |
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mov \rd, \rd, lsr #8 |
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strb \rd, [r0] |
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#else |
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mov lr, \rd, lsr #24 |
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strb lr, [r0] |
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mov lr, \rd, lsr #16 |
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strb lr, [r0] |
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mov lr, \rd, lsr #8 |
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strb lr, [r0] |
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strb \rd, [r0] |
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#endif |
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.endm |
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.Loutsb_align: rsb ip, ip, #4 |
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cmp ip, r2 |
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movgt ip, r2 |
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cmp ip, #2 |
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ldrb r3, [r1], #1 |
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strb r3, [r0] |
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ldrbge r3, [r1], #1 |
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strbge r3, [r0] |
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ldrbgt r3, [r1], #1 |
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strbgt r3, [r0] |
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subs r2, r2, ip |
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bne .Loutsb_aligned |
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ENTRY(__raw_writesb) |
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teq r2, #0 @ do we have to check for the zero len? |
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reteq lr |
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ands ip, r1, #3 |
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bne .Loutsb_align |
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.Loutsb_aligned: |
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stmfd sp!, {r4, r5, lr} |
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subs r2, r2, #16 |
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bmi .Loutsb_no_16 |
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.Loutsb_16_lp: ldmia r1!, {r3, r4, r5, ip} |
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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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subs r2, r2, #16 |
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bpl .Loutsb_16_lp |
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tst r2, #15 |
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ldmfdeq sp!, {r4, r5, pc} |
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.Loutsb_no_16: tst r2, #8 |
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beq .Loutsb_no_8 |
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ldmia r1!, {r3, r4} |
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outword r3 |
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outword r4 |
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.Loutsb_no_8: tst r2, #4 |
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beq .Loutsb_no_4 |
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ldr r3, [r1], #4 |
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outword r3 |
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.Loutsb_no_4: ands r2, r2, #3 |
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ldmfdeq sp!, {r4, r5, pc} |
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cmp r2, #2 |
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ldrb r3, [r1], #1 |
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strb r3, [r0] |
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ldrbge r3, [r1], #1 |
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strbge r3, [r0] |
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ldrbgt r3, [r1] |
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strbgt r3, [r0] |
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ldmfd sp!, {r4, r5, pc} |
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ENDPROC(__raw_writesb)
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