1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 *  linux/arch/arm/lib/io-readsw-armv3.S
  4 *
  5 *  Copyright (C) 1995-2000 Russell King
  6 */
  7#include <linux/linkage.h>
  8#include <asm/assembler.h>
  9
 10.Linsw_bad_alignment:
 11		adr	r0, .Linsw_bad_align_msg
 12		mov	r2, lr
 13		b	panic
 14.Linsw_bad_align_msg:
 15		.asciz	"insw: bad buffer alignment (0x%p, lr=0x%08lX)\n"
 16		.align
 17
 18.Linsw_align:	tst	r1, #1
 19		bne	.Linsw_bad_alignment
 20
 21		ldr	r3, [r0]
 22		strb	r3, [r1], #1
 23		mov	r3, r3, lsr #8
 24		strb	r3, [r1], #1
 25
 26		subs	r2, r2, #1
 27		reteq	lr
 28
 29ENTRY(__raw_readsw)
 30		teq	r2, #0		@ do we have to check for the zero len?
 31		reteq	lr
 32		tst	r1, #3
 33		bne	.Linsw_align
 34
 35.Linsw_aligned:	mov	ip, #0xff
 36		orr	ip, ip, ip, lsl #8
 37		stmfd	sp!, {r4, r5, r6, lr}
 38
 39		subs	r2, r2, #8
 40		bmi	.Lno_insw_8
 41
 42.Linsw_8_lp:	ldr	r3, [r0]
 43		and	r3, r3, ip
 44		ldr	r4, [r0]
 45		orr	r3, r3, r4, lsl #16
 46
 47		ldr	r4, [r0]
 48		and	r4, r4, ip
 49		ldr	r5, [r0]
 50		orr	r4, r4, r5, lsl #16
 51
 52		ldr	r5, [r0]
 53		and	r5, r5, ip
 54		ldr	r6, [r0]
 55		orr	r5, r5, r6, lsl #16
 56
 57		ldr	r6, [r0]
 58		and	r6, r6, ip
 59		ldr	lr, [r0]
 60		orr	r6, r6, lr, lsl #16
 61
 62		stmia	r1!, {r3 - r6}
 63
 64		subs	r2, r2, #8
 65		bpl	.Linsw_8_lp
 66
 67		tst	r2, #7
 68		ldmfdeq	sp!, {r4, r5, r6, pc}
 69
 70.Lno_insw_8:	tst	r2, #4
 71		beq	.Lno_insw_4
 72
 73		ldr	r3, [r0]
 74		and	r3, r3, ip
 75		ldr	r4, [r0]
 76		orr	r3, r3, r4, lsl #16
 77
 78		ldr	r4, [r0]
 79		and	r4, r4, ip
 80		ldr	r5, [r0]
 81		orr	r4, r4, r5, lsl #16
 82
 83		stmia	r1!, {r3, r4}
 84
 85.Lno_insw_4:	tst	r2, #2
 86		beq	.Lno_insw_2
 87
 88		ldr	r3, [r0]
 89		and	r3, r3, ip
 90		ldr	r4, [r0]
 91		orr	r3, r3, r4, lsl #16
 92
 93		str	r3, [r1], #4
 94
 95.Lno_insw_2:	tst	r2, #1
 96		ldrne	r3, [r0]
 97		strbne	r3, [r1], #1
 98		movne	r3, r3, lsr #8
 99		strbne	r3, [r1]
100
101		ldmfd	sp!, {r4, r5, r6, pc}
102
103