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