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| /* SPDX-License-Identifier: GPL-2.0-only */
| /*
| * linux/arch/arm/lib/io-readsb.S
| *
| * Copyright (C) 1995-2000 Russell King
| */
| #include <linux/linkage.h>
| #include <asm/assembler.h>
|
| .Linsb_align: rsb ip, ip, #4
| cmp ip, r2
| movgt ip, r2
| cmp ip, #2
| ldrb r3, [r0]
| strb r3, [r1], #1
| ldrbge r3, [r0]
| strbge r3, [r1], #1
| ldrbgt r3, [r0]
| strbgt r3, [r1], #1
| subs r2, r2, ip
| bne .Linsb_aligned
|
| ENTRY(__raw_readsb)
| teq r2, #0 @ do we have to check for the zero len?
| reteq lr
| ands ip, r1, #3
| bne .Linsb_align
|
| .Linsb_aligned: stmfd sp!, {r4 - r6, lr}
|
| subs r2, r2, #16
| bmi .Linsb_no_16
|
| .Linsb_16_lp: ldrb r3, [r0]
| ldrb r4, [r0]
| ldrb r5, [r0]
| mov r3, r3, put_byte_0
| ldrb r6, [r0]
| orr r3, r3, r4, put_byte_1
| ldrb r4, [r0]
| orr r3, r3, r5, put_byte_2
| ldrb r5, [r0]
| orr r3, r3, r6, put_byte_3
| ldrb r6, [r0]
| mov r4, r4, put_byte_0
| ldrb ip, [r0]
| orr r4, r4, r5, put_byte_1
| ldrb r5, [r0]
| orr r4, r4, r6, put_byte_2
| ldrb r6, [r0]
| orr r4, r4, ip, put_byte_3
| ldrb ip, [r0]
| mov r5, r5, put_byte_0
| ldrb lr, [r0]
| orr r5, r5, r6, put_byte_1
| ldrb r6, [r0]
| orr r5, r5, ip, put_byte_2
| ldrb ip, [r0]
| orr r5, r5, lr, put_byte_3
| ldrb lr, [r0]
| mov r6, r6, put_byte_0
| orr r6, r6, ip, put_byte_1
| ldrb ip, [r0]
| orr r6, r6, lr, put_byte_2
| orr r6, r6, ip, put_byte_3
| stmia r1!, {r3 - r6}
|
| subs r2, r2, #16
| bpl .Linsb_16_lp
|
| tst r2, #15
| ldmfdeq sp!, {r4 - r6, pc}
|
| .Linsb_no_16: tst r2, #8
| beq .Linsb_no_8
|
| ldrb r3, [r0]
| ldrb r4, [r0]
| ldrb r5, [r0]
| mov r3, r3, put_byte_0
| ldrb r6, [r0]
| orr r3, r3, r4, put_byte_1
| ldrb r4, [r0]
| orr r3, r3, r5, put_byte_2
| ldrb r5, [r0]
| orr r3, r3, r6, put_byte_3
| ldrb r6, [r0]
| mov r4, r4, put_byte_0
| ldrb ip, [r0]
| orr r4, r4, r5, put_byte_1
| orr r4, r4, r6, put_byte_2
| orr r4, r4, ip, put_byte_3
| stmia r1!, {r3, r4}
|
| .Linsb_no_8: tst r2, #4
| beq .Linsb_no_4
|
| ldrb r3, [r0]
| ldrb r4, [r0]
| ldrb r5, [r0]
| ldrb r6, [r0]
| mov r3, r3, put_byte_0
| orr r3, r3, r4, put_byte_1
| orr r3, r3, r5, put_byte_2
| orr r3, r3, r6, put_byte_3
| str r3, [r1], #4
|
| .Linsb_no_4: ands r2, r2, #3
| ldmfdeq sp!, {r4 - r6, pc}
|
| cmp r2, #2
| ldrb r3, [r0]
| strb r3, [r1], #1
| ldrbge r3, [r0]
| strbge r3, [r1], #1
| ldrbgt r3, [r0]
| strbgt r3, [r1]
|
| ldmfd sp!, {r4 - r6, pc}
| ENDPROC(__raw_readsb)
|
|
