Imported Upstream version 1.4upstream/1.4

1 files changed, 24 insertions, 0 deletions

diff --git a/src/runtime/cgo/asm_arm.s b/src/runtime/cgo/asm_arm.s
new file mode 100644
index 000000000..6e57432e3
--- /dev/null
+++ b/src/runtime/cgo/asm_arm.s
@@ -0,0 +1,24 @@
+// Copyright 2012 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+
+/*
+ * void crosscall2(void (*fn)(void*, int32), void*, int32)
+ * Save registers and call fn with two arguments.
+ */
+TEXT crosscall2(SB),NOSPLIT,$-4
+	/* 
+	 * We still need to save all callee save register as before, and then
+	 *  push 2 args for fn (R1 and R2).
+	 * Also note that at procedure entry in 5c/5g world, 4(R13) will be the
+	 *  first arg, so we must push another dummy reg (R0) for 0(R13).
+	 *  Additionally, runtime·load_g will clobber R0, so we need to save R0
+	 *  nevertheless.
+	 */
+	MOVM.WP	[R0, R1, R2, R4, R5, R6, R7, R8, R9, g, R11, R12, R14], (R13)
+	BL	runtime·load_g(SB)
+	MOVW	PC, R14
+	MOVW	0(R13), PC
+	MOVM.IAW	(R13), [R0, R1, R2, R4, R5, R6, R7, R8, R9, g, R11, R12, PC]