summaryrefslogtreecommitdiffstats
path: root/arch/arm64/lib/tishift.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm64/lib/tishift.S')
-rw-r--r--arch/arm64/lib/tishift.S80
1 files changed, 80 insertions, 0 deletions
diff --git a/arch/arm64/lib/tishift.S b/arch/arm64/lib/tishift.S
new file mode 100644
index 000000000000..0179a43cc045
--- /dev/null
+++ b/arch/arm64/lib/tishift.S
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2017 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+
+ENTRY(__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
+ENDPROC(__ashlti3)
+
+ENTRY(__ashrti3)
+ cbz x2, 3f
+ mov x3, #64
+ sub x3, x3, x2
+ cmp x3, #0
+ b.le 4f
+ lsr x0, x0, x2
+ lsl x3, x1, x3
+ asr x2, x1, x2
+ orr x0, x0, x3
+ mov x1, x2
+3:
+ ret
+4:
+ neg w0, w3
+ asr x2, x1, #63
+ asr x0, x1, x0
+ mov x1, x2
+ ret
+ENDPROC(__ashrti3)
+
+ENTRY(__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
+ENDPROC(__lshrti3)