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76 lines
1.4 KiB
76 lines
1.4 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* linux/arch/arm/lib/io-readsl.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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ENTRY(__raw_readsl) |
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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 3f |
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subs r2, r2, #4 |
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bmi 2f |
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stmfd sp!, {r4, lr} |
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1: ldr r3, [r0, #0] |
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ldr r4, [r0, #0] |
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ldr ip, [r0, #0] |
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ldr lr, [r0, #0] |
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subs r2, r2, #4 |
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stmia r1!, {r3, r4, ip, lr} |
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bpl 1b |
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ldmfd sp!, {r4, lr} |
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2: movs r2, r2, lsl #31 |
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ldrcs r3, [r0, #0] |
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ldrcs ip, [r0, #0] |
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stmiacs r1!, {r3, ip} |
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ldrne r3, [r0, #0] |
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strne r3, [r1, #0] |
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ret lr |
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3: ldr r3, [r0] |
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cmp ip, #2 |
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mov ip, r3, get_byte_0 |
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strb ip, [r1], #1 |
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bgt 6f |
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mov ip, r3, get_byte_1 |
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strb ip, [r1], #1 |
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beq 5f |
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mov ip, r3, get_byte_2 |
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strb ip, [r1], #1 |
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4: subs r2, r2, #1 |
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mov ip, r3, lspull #24 |
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ldrne r3, [r0] |
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orrne ip, ip, r3, lspush #8 |
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strne ip, [r1], #4 |
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bne 4b |
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b 8f |
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5: subs r2, r2, #1 |
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mov ip, r3, lspull #16 |
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ldrne r3, [r0] |
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orrne ip, ip, r3, lspush #16 |
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strne ip, [r1], #4 |
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bne 5b |
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b 7f |
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6: subs r2, r2, #1 |
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mov ip, r3, lspull #8 |
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ldrne r3, [r0] |
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orrne ip, ip, r3, lspush #24 |
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strne ip, [r1], #4 |
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bne 6b |
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mov r3, ip, get_byte_2 |
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strb r3, [r1, #2] |
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7: mov r3, ip, get_byte_1 |
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strb r3, [r1, #1] |
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8: mov r3, ip, get_byte_0 |
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strb r3, [r1, #0] |
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ret lr |
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ENDPROC(__raw_readsl)
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