Adding upstream version 1.21.8.upstream/1.21.8

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 91 insertions, 0 deletions

diff --git a/src/runtime/memclr_arm.s b/src/runtime/memclr_arm.s
new file mode 100644
index 0000000..f02d058
--- /dev/null
+++ b/src/runtime/memclr_arm.s
@@ -0,0 +1,91 @@
+// Inferno's libkern/memset-arm.s
+// https://bitbucket.org/inferno-os/inferno-os/src/master/libkern/memset-arm.s
+//
+//         Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
+//         Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com).  All rights reserved.
+//         Portions Copyright 2009 The Go Authors. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#include "textflag.h"
+
+#define TO	R8
+#define TOE	R11
+#define N	R12
+#define TMP	R12				/* N and TMP don't overlap */
+
+// See memclrNoHeapPointers Go doc for important implementation constraints.
+
+// func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr)
+// Also called from assembly in sys_windows_arm.s without g (but using Go stack convention).
+TEXT runtime·memclrNoHeapPointers(SB),NOSPLIT,$0-8
+	MOVW	ptr+0(FP), TO
+	MOVW	n+4(FP), N
+	MOVW	$0, R0
+
+	ADD	N, TO, TOE	/* to end pointer */
+
+	CMP	$4, N		/* need at least 4 bytes to copy */
+	BLT	_1tail
+
+_4align:				/* align on 4 */
+	AND.S	$3, TO, TMP
+	BEQ	_4aligned
+
+	MOVBU.P	R0, 1(TO)		/* implicit write back */
+	B	_4align
+
+_4aligned:
+	SUB	$31, TOE, TMP	/* do 32-byte chunks if possible */
+	CMP	TMP, TO
+	BHS	_4tail
+
+	MOVW	R0, R1			/* replicate */
+	MOVW	R0, R2
+	MOVW	R0, R3
+	MOVW	R0, R4
+	MOVW	R0, R5
+	MOVW	R0, R6
+	MOVW	R0, R7
+
+_f32loop:
+	CMP	TMP, TO
+	BHS	_4tail
+
+	MOVM.IA.W [R0-R7], (TO)
+	B	_f32loop
+
+_4tail:
+	SUB	$3, TOE, TMP	/* do remaining words if possible */
+_4loop:
+	CMP	TMP, TO
+	BHS	_1tail
+
+	MOVW.P	R0, 4(TO)		/* implicit write back */
+	B	_4loop
+
+_1tail:
+	CMP	TO, TOE
+	BEQ	_return
+
+	MOVBU.P	R0, 1(TO)		/* implicit write back */
+	B	_1tail
+
+_return:
+	RET