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| /* SPDX-License-Identifier: GPL-2.0-only */
| /*
| * linux/arch/arm/lib/io-writesw-armv4.S
| *
| * Copyright (C) 1995-2000 Russell King
| */
| #include <linux/linkage.h>
| #include <asm/assembler.h>
|
| .macro outword, rd
| #ifndef __ARMEB__
| strh \rd, [r0]
| mov \rd, \rd, lsr #16
| strh \rd, [r0]
| #else
| mov lr, \rd, lsr #16
| strh lr, [r0]
| strh \rd, [r0]
| #endif
| .endm
|
| .Loutsw_align: movs ip, r1, lsl #31
| bne .Loutsw_noalign
|
| ldrh r3, [r1], #2
| sub r2, r2, #1
| strh r3, [r0]
|
| ENTRY(__raw_writesw)
| teq r2, #0
| reteq lr
| ands r3, r1, #3
| bne .Loutsw_align
|
| stmfd sp!, {r4, r5, lr}
|
| subs r2, r2, #8
| bmi .Lno_outsw_8
|
| .Loutsw_8_lp: ldmia r1!, {r3, r4, r5, ip}
| subs r2, r2, #8
| outword r3
| outword r4
| outword r5
| outword ip
| bpl .Loutsw_8_lp
|
| .Lno_outsw_8: tst r2, #4
| beq .Lno_outsw_4
|
| ldmia r1!, {r3, ip}
| outword r3
| outword ip
|
| .Lno_outsw_4: movs r2, r2, lsl #31
| bcc .Lno_outsw_2
|
| ldr r3, [r1], #4
| outword r3
|
| .Lno_outsw_2: ldrhne r3, [r1]
| strhne r3, [r0]
|
| ldmfd sp!, {r4, r5, pc}
|
| #ifdef __ARMEB__
| #define pull_hbyte0 lsl #8
| #define push_hbyte1 lsr #24
| #else
| #define pull_hbyte0 lsr #24
| #define push_hbyte1 lsl #8
| #endif
|
| .Loutsw_noalign:
| ARM( ldr r3, [r1, -r3]! )
| THUMB( rsb r3, r3, #0 )
| THUMB( ldr r3, [r1, r3] )
| THUMB( sub r1, r3 )
| subcs r2, r2, #1
| bcs 2f
| subs r2, r2, #2
| bmi 3f
|
| 1: mov ip, r3, lsr #8
| strh ip, [r0]
| 2: mov ip, r3, pull_hbyte0
| ldr r3, [r1, #4]!
| subs r2, r2, #2
| orr ip, ip, r3, push_hbyte1
| strh ip, [r0]
| bpl 1b
|
| tst r2, #1
| 3: movne ip, r3, lsr #8
| strhne ip, [r0]
| ret lr
| ENDPROC(__raw_writesw)
|
|
