runtime/cgo: make crosscall2 5a/6a/8a-assembled
There is a #pragma dynexport crosscall2, to help SWIG,
and 6l cannot export the symbol if it doesn't get to see it.
R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7448044
diff --git a/src/pkg/runtime/cgo/asm_arm.s b/src/pkg/runtime/cgo/asm_arm.s
new file mode 100644
index 0000000..1aa760e
--- /dev/null
+++ b/src/pkg/runtime/cgo/asm_arm.s
@@ -0,0 +1,22 @@
+// 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.
+
+/*
+ * void crosscall2(void (*fn)(void*, int32), void*, int32)
+ * Save registers and call fn with two arguments.
+ */
+TEXT crosscall2(SB),7,$-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, cgo_tls_set_gm will clobber R0, so we need to save R0
+ * nevertheless.
+ */
+ MOVM.WP [R0, R1, R2, R4, R5, R6, R7, R8, R9, R10, R11, R12, R14], (R13)
+ BL x_cgo_load_gm(SB)
+ MOVW PC, R14
+ MOVW -4(R13), PC
+ MOVM.IAW (R13), [R0, R1, R2, R4, R5, R6, R7, R8, R9, R10, R11, R12, PC]
