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-rw-r--r--arch/arm64/lib/tishift.S74
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 000000000..a88613834
--- /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)