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128 lines
2.2 KiB
128 lines
2.2 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* linux/arch/arm/lib/io-readsw-armv4.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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.macro pack, rd, hw1, hw2 |
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#ifndef __ARMEB__ |
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orr \rd, \hw1, \hw2, lsl #16 |
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#else |
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orr \rd, \hw2, \hw1, lsl #16 |
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#endif |
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.endm |
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.Linsw_align: movs ip, r1, lsl #31 |
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bne .Linsw_noalign |
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ldrh ip, [r0] |
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sub r2, r2, #1 |
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strh ip, [r1], #2 |
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ENTRY(__raw_readsw) |
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teq r2, #0 |
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reteq lr |
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tst r1, #3 |
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bne .Linsw_align |
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stmfd sp!, {r4, r5, lr} |
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subs r2, r2, #8 |
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bmi .Lno_insw_8 |
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.Linsw_8_lp: ldrh r3, [r0] |
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ldrh r4, [r0] |
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pack r3, r3, r4 |
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ldrh r4, [r0] |
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ldrh r5, [r0] |
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pack r4, r4, r5 |
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ldrh r5, [r0] |
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ldrh ip, [r0] |
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pack r5, r5, ip |
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ldrh ip, [r0] |
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ldrh lr, [r0] |
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pack ip, ip, lr |
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subs r2, r2, #8 |
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stmia r1!, {r3 - r5, ip} |
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bpl .Linsw_8_lp |
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.Lno_insw_8: tst r2, #4 |
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beq .Lno_insw_4 |
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ldrh r3, [r0] |
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ldrh r4, [r0] |
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pack r3, r3, r4 |
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ldrh r4, [r0] |
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ldrh ip, [r0] |
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pack r4, r4, ip |
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stmia r1!, {r3, r4} |
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.Lno_insw_4: movs r2, r2, lsl #31 |
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bcc .Lno_insw_2 |
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ldrh r3, [r0] |
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ldrh ip, [r0] |
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pack r3, r3, ip |
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str r3, [r1], #4 |
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.Lno_insw_2: ldrhne r3, [r0] |
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strhne r3, [r1] |
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ldmfd sp!, {r4, r5, pc} |
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#ifdef __ARMEB__ |
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#define _BE_ONLY_(code...) code |
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#define _LE_ONLY_(code...) |
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#define push_hbyte0 lsr #8 |
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#define pull_hbyte1 lsl #24 |
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#else |
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#define _BE_ONLY_(code...) |
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#define _LE_ONLY_(code...) code |
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#define push_hbyte0 lsl #24 |
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#define pull_hbyte1 lsr #8 |
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#endif |
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.Linsw_noalign: stmfd sp!, {r4, lr} |
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ldrbcc ip, [r1, #-1]! |
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bcc 1f |
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ldrh ip, [r0] |
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sub r2, r2, #1 |
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_BE_ONLY_( mov ip, ip, ror #8 ) |
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strb ip, [r1], #1 |
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_LE_ONLY_( mov ip, ip, lsr #8 ) |
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_BE_ONLY_( mov ip, ip, lsr #24 ) |
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1: subs r2, r2, #2 |
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bmi 3f |
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_BE_ONLY_( mov ip, ip, lsl #24 ) |
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2: ldrh r3, [r0] |
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ldrh r4, [r0] |
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subs r2, r2, #2 |
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orr ip, ip, r3, lsl #8 |
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orr ip, ip, r4, push_hbyte0 |
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str ip, [r1], #4 |
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mov ip, r4, pull_hbyte1 |
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bpl 2b |
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_BE_ONLY_( mov ip, ip, lsr #24 ) |
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3: tst r2, #1 |
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strb ip, [r1], #1 |
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ldrhne ip, [r0] |
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_BE_ONLY_( movne ip, ip, ror #8 ) |
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strbne ip, [r1], #1 |
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_LE_ONLY_( movne ip, ip, lsr #8 ) |
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_BE_ONLY_( movne ip, ip, lsr #24 ) |
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strbne ip, [r1] |
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ldmfd sp!, {r4, pc} |
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ENDPROC(__raw_readsw)
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