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| /* SPDX-License-Identifier: GPL-2.0-only */
| /*
| * linux/arch/arm/lib/io-readsw-armv3.S
| *
| * Copyright (C) 1995-2000 Russell King
| */
| #include <linux/linkage.h>
| #include <asm/assembler.h>
|
| .Linsw_bad_alignment:
| adr r0, .Linsw_bad_align_msg
| mov r2, lr
| b panic
| .Linsw_bad_align_msg:
| .asciz "insw: bad buffer alignment (0x%p, lr=0x%08lX)\n"
| .align
|
| .Linsw_align: tst r1, #1
| bne .Linsw_bad_alignment
|
| ldr r3, [r0]
| strb r3, [r1], #1
| mov r3, r3, lsr #8
| strb r3, [r1], #1
|
| subs r2, r2, #1
| reteq lr
|
| ENTRY(__raw_readsw)
| teq r2, #0 @ do we have to check for the zero len?
| reteq lr
| tst r1, #3
| bne .Linsw_align
|
| .Linsw_aligned: mov ip, #0xff
| orr ip, ip, ip, lsl #8
| stmfd sp!, {r4, r5, r6, lr}
|
| subs r2, r2, #8
| bmi .Lno_insw_8
|
| .Linsw_8_lp: ldr r3, [r0]
| and r3, r3, ip
| ldr r4, [r0]
| orr r3, r3, r4, lsl #16
|
| ldr r4, [r0]
| and r4, r4, ip
| ldr r5, [r0]
| orr r4, r4, r5, lsl #16
|
| ldr r5, [r0]
| and r5, r5, ip
| ldr r6, [r0]
| orr r5, r5, r6, lsl #16
|
| ldr r6, [r0]
| and r6, r6, ip
| ldr lr, [r0]
| orr r6, r6, lr, lsl #16
|
| stmia r1!, {r3 - r6}
|
| subs r2, r2, #8
| bpl .Linsw_8_lp
|
| tst r2, #7
| ldmfdeq sp!, {r4, r5, r6, pc}
|
| .Lno_insw_8: tst r2, #4
| beq .Lno_insw_4
|
| ldr r3, [r0]
| and r3, r3, ip
| ldr r4, [r0]
| orr r3, r3, r4, lsl #16
|
| ldr r4, [r0]
| and r4, r4, ip
| ldr r5, [r0]
| orr r4, r4, r5, lsl #16
|
| stmia r1!, {r3, r4}
|
| .Lno_insw_4: tst r2, #2
| beq .Lno_insw_2
|
| ldr r3, [r0]
| and r3, r3, ip
| ldr r4, [r0]
| orr r3, r3, r4, lsl #16
|
| str r3, [r1], #4
|
| .Lno_insw_2: tst r2, #1
| ldrne r3, [r0]
| strbne r3, [r1], #1
| movne r3, r3, lsr #8
| strbne r3, [r1]
|
| ldmfd sp!, {r4, r5, r6, pc}
|
|
