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| /* SPDX-License-Identifier: GPL-2.0-only */
| /*
| * linux/arch/arm/lib/io-readsl.S
| *
| * Copyright (C) 1995-2000 Russell King
| */
| #include <linux/linkage.h>
| #include <asm/assembler.h>
|
| ENTRY(__raw_readsl)
| teq r2, #0 @ do we have to check for the zero len?
| reteq lr
| ands ip, r1, #3
| bne 3f
|
| subs r2, r2, #4
| bmi 2f
| stmfd sp!, {r4, lr}
| 1: ldr r3, [r0, #0]
| ldr r4, [r0, #0]
| ldr ip, [r0, #0]
| ldr lr, [r0, #0]
| subs r2, r2, #4
| stmia r1!, {r3, r4, ip, lr}
| bpl 1b
| ldmfd sp!, {r4, lr}
| 2: movs r2, r2, lsl #31
| ldrcs r3, [r0, #0]
| ldrcs ip, [r0, #0]
| stmiacs r1!, {r3, ip}
| ldrne r3, [r0, #0]
| strne r3, [r1, #0]
| ret lr
|
| 3: ldr r3, [r0]
| cmp ip, #2
| mov ip, r3, get_byte_0
| strb ip, [r1], #1
| bgt 6f
| mov ip, r3, get_byte_1
| strb ip, [r1], #1
| beq 5f
| mov ip, r3, get_byte_2
| strb ip, [r1], #1
|
| 4: subs r2, r2, #1
| mov ip, r3, lspull #24
| ldrne r3, [r0]
| orrne ip, ip, r3, lspush #8
| strne ip, [r1], #4
| bne 4b
| b 8f
|
| 5: subs r2, r2, #1
| mov ip, r3, lspull #16
| ldrne r3, [r0]
| orrne ip, ip, r3, lspush #16
| strne ip, [r1], #4
| bne 5b
| b 7f
|
| 6: subs r2, r2, #1
| mov ip, r3, lspull #8
| ldrne r3, [r0]
| orrne ip, ip, r3, lspush #24
| strne ip, [r1], #4
| bne 6b
|
| mov r3, ip, get_byte_2
| strb r3, [r1, #2]
| 7: mov r3, ip, get_byte_1
| strb r3, [r1, #1]
| 8: mov r3, ip, get_byte_0
| strb r3, [r1, #0]
| ret lr
| ENDPROC(__raw_readsl)
|
|
