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103 lines
1.6 KiB
103 lines
1.6 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* linux/arch/arm/lib/io-readsw-armv3.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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.Linsw_bad_alignment: |
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adr r0, .Linsw_bad_align_msg |
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mov r2, lr |
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b panic |
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.Linsw_bad_align_msg: |
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.asciz "insw: bad buffer alignment (0x%p, lr=0x%08lX)\n" |
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.align |
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.Linsw_align: tst r1, #1 |
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bne .Linsw_bad_alignment |
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ldr r3, [r0] |
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strb r3, [r1], #1 |
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mov r3, r3, lsr #8 |
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strb r3, [r1], #1 |
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subs r2, r2, #1 |
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reteq lr |
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ENTRY(__raw_readsw) |
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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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tst r1, #3 |
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bne .Linsw_align |
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.Linsw_aligned: mov ip, #0xff |
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orr ip, ip, ip, lsl #8 |
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stmfd sp!, {r4, r5, r6, lr} |
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subs r2, r2, #8 |
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bmi .Lno_insw_8 |
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.Linsw_8_lp: ldr r3, [r0] |
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and r3, r3, ip |
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ldr r4, [r0] |
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orr r3, r3, r4, lsl #16 |
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ldr r4, [r0] |
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and r4, r4, ip |
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ldr r5, [r0] |
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orr r4, r4, r5, lsl #16 |
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ldr r5, [r0] |
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and r5, r5, ip |
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ldr r6, [r0] |
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orr r5, r5, r6, lsl #16 |
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ldr r6, [r0] |
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and r6, r6, ip |
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ldr lr, [r0] |
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orr r6, r6, lr, lsl #16 |
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stmia r1!, {r3 - r6} |
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subs r2, r2, #8 |
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bpl .Linsw_8_lp |
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tst r2, #7 |
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ldmfdeq sp!, {r4, r5, r6, pc} |
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.Lno_insw_8: tst r2, #4 |
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beq .Lno_insw_4 |
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ldr r3, [r0] |
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and r3, r3, ip |
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ldr r4, [r0] |
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orr r3, r3, r4, lsl #16 |
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ldr r4, [r0] |
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and r4, r4, ip |
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ldr r5, [r0] |
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orr r4, r4, r5, lsl #16 |
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stmia r1!, {r3, r4} |
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.Lno_insw_4: tst r2, #2 |
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beq .Lno_insw_2 |
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ldr r3, [r0] |
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and r3, r3, ip |
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ldr r4, [r0] |
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orr r3, r3, r4, lsl #16 |
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str r3, [r1], #4 |
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.Lno_insw_2: tst r2, #1 |
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ldrne r3, [r0] |
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strbne r3, [r1], #1 |
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movne r3, r3, lsr #8 |
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strbne r3, [r1] |
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ldmfd sp!, {r4, r5, r6, pc} |
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