92 lines
1.5 KiB
ArmAsm
92 lines
1.5 KiB
ArmAsm
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/* 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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