1 files changed, 74 insertions, 0 deletions
diff --git a/arch/arm64/lib/tishift.S b/arch/arm64/lib/tishift.S
new file mode 100644
index 000000000000..a88613834fb0
--- /dev/null
+++ b/arch/arm64/lib/tishift.S
@@ -0,0 +1,74 @@
+/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+ *
+ * Copyright (C) 2017-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ */
+
+#include <linux/linkage.h>
+
+#include <asm/assembler.h>
+
+SYM_FUNC_START(__ashlti3)
+	cbz	x2, 1f
+	mov	x3, #64
+	sub	x3, x3, x2
+	cmp	x3, #0
+	b.le	2f
+	lsl	x1, x1, x2
+	lsr	x3, x0, x3
+	lsl	x2, x0, x2
+	orr	x1, x1, x3
+	mov	x0, x2
+1:
+	ret
+2:
+	neg	w1, w3
+	mov	x2, #0
+	lsl	x1, x0, x1
+	mov	x0, x2
+	ret
+SYM_FUNC_END(__ashlti3)
+EXPORT_SYMBOL(__ashlti3)
+
+SYM_FUNC_START(__ashrti3)
+	cbz	x2, 1f
+	mov	x3, #64
+	sub	x3, x3, x2
+	cmp	x3, #0
+	b.le	2f
+	lsr	x0, x0, x2
+	lsl	x3, x1, x3
+	asr	x2, x1, x2
+	orr	x0, x0, x3
+	mov	x1, x2
+1:
+	ret
+2:
+	neg	w0, w3
+	asr	x2, x1, #63
+	asr	x0, x1, x0
+	mov	x1, x2
+	ret
+SYM_FUNC_END(__ashrti3)
+EXPORT_SYMBOL(__ashrti3)
+
+SYM_FUNC_START(__lshrti3)
+	cbz	x2, 1f
+	mov	x3, #64
+	sub	x3, x3, x2
+	cmp	x3, #0
+	b.le	2f
+	lsr	x0, x0, x2
+	lsl	x3, x1, x3
+	lsr	x2, x1, x2
+	orr	x0, x0, x3
+	mov	x1, x2
+1:
+	ret
+2:
+	neg	w0, w3
+	mov	x2, #0
+	lsr	x0, x1, x0
+	mov	x1, x2
+	ret
+SYM_FUNC_END(__lshrti3)
+EXPORT_SYMBOL(__lshrti3)