| /* 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) |
