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| /* SPDX-License-Identifier: GPL-2.0-only */
| /*
| * linux/arch/arm/lib/io-writesb.S
| *
| * Copyright (C) 1995-2000 Russell King
| */
| #include <linux/linkage.h>
| #include <asm/assembler.h>
|
| .macro outword, rd
| #ifndef __ARMEB__
| strb \rd, [r0]
| mov \rd, \rd, lsr #8
| strb \rd, [r0]
| mov \rd, \rd, lsr #8
| strb \rd, [r0]
| mov \rd, \rd, lsr #8
| strb \rd, [r0]
| #else
| mov lr, \rd, lsr #24
| strb lr, [r0]
| mov lr, \rd, lsr #16
| strb lr, [r0]
| mov lr, \rd, lsr #8
| strb lr, [r0]
| strb \rd, [r0]
| #endif
| .endm
|
| .Loutsb_align: rsb ip, ip, #4
| cmp ip, r2
| movgt ip, r2
| cmp ip, #2
| ldrb r3, [r1], #1
| strb r3, [r0]
| ldrbge r3, [r1], #1
| strbge r3, [r0]
| ldrbgt r3, [r1], #1
| strbgt r3, [r0]
| subs r2, r2, ip
| bne .Loutsb_aligned
|
| ENTRY(__raw_writesb)
| teq r2, #0 @ do we have to check for the zero len?
| reteq lr
| ands ip, r1, #3
| bne .Loutsb_align
|
| .Loutsb_aligned:
| stmfd sp!, {r4, r5, lr}
|
| subs r2, r2, #16
| bmi .Loutsb_no_16
|
| .Loutsb_16_lp: ldmia r1!, {r3, r4, r5, ip}
| outword r3
| outword r4
| outword r5
| outword ip
| subs r2, r2, #16
| bpl .Loutsb_16_lp
|
| tst r2, #15
| ldmfdeq sp!, {r4, r5, pc}
|
| .Loutsb_no_16: tst r2, #8
| beq .Loutsb_no_8
|
| ldmia r1!, {r3, r4}
| outword r3
| outword r4
|
| .Loutsb_no_8: tst r2, #4
| beq .Loutsb_no_4
|
| ldr r3, [r1], #4
| outword r3
|
| .Loutsb_no_4: ands r2, r2, #3
| ldmfdeq sp!, {r4, r5, pc}
|
| cmp r2, #2
| ldrb r3, [r1], #1
| strb r3, [r0]
| ldrbge r3, [r1], #1
| strbge r3, [r0]
| ldrbgt r3, [r1]
| strbgt r3, [r0]
|
| ldmfd sp!, {r4, r5, pc}
| ENDPROC(__raw_writesb)
|
|
