1 files changed, 64 insertions, 0 deletions
diff --git a/arch/arm/lib/io-writesl.S b/arch/arm/lib/io-writesl.S
new file mode 100644
index 000000000..89ef7be61
--- /dev/null
+++ b/arch/arm/lib/io-writesl.S
@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *  linux/arch/arm/lib/io-writesl.S
+ *
+ *  Copyright (C) 1995-2000 Russell King
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+ENTRY(__raw_writesl)
+		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:		ldmia	r1!, {r3, r4, ip, lr}
+		subs	r2, r2, #4
+		str	r3, [r0, #0]
+		str	r4, [r0, #0]
+		str	ip, [r0, #0]
+		str	lr, [r0, #0]
+		bpl	1b
+		ldmfd	sp!, {r4, lr}
+2:		movs	r2, r2, lsl #31
+		ldmiacs	r1!, {r3, ip}
+		strcs	r3, [r0, #0]
+		ldrne	r3, [r1, #0]
+		strcs	ip, [r0, #0]
+		strne	r3, [r0, #0]
+		ret	lr
+
+3:		bic	r1, r1, #3
+		ldr	r3, [r1], #4
+		cmp	ip, #2
+		blt	5f
+		bgt	6f
+
+4:		mov	ip, r3, lspull #16
+		ldr	r3, [r1], #4
+		subs	r2, r2, #1
+		orr	ip, ip, r3, lspush #16
+		str	ip, [r0]
+		bne	4b
+		ret	lr
+
+5:		mov	ip, r3, lspull #8
+		ldr	r3, [r1], #4
+		subs	r2, r2, #1
+		orr	ip, ip, r3, lspush #24
+		str	ip, [r0]
+		bne	5b
+		ret	lr
+
+6:		mov	ip, r3, lspull #24
+		ldr	r3, [r1], #4
+		subs	r2, r2, #1
+		orr	ip, ip, r3, lspush #8
+		str	ip, [r0]
+		bne	6b
+		ret	lr
+ENDPROC(__raw_writesl)