misc/cgo/test: add mips64x test case for issue9400

Change-Id: If2b4abb6ff322c20e35de025298c8e5ab53edd42 Reviewed-on: https://go-review.googlesource.com/19808 Reviewed-by: Minux Ma <[email protected]>
rathangeorge · May 4, 2016 · 094e5a9 · 094e5a9
1 parent dcd6138
commit 094e5a9
Showing 1 changed file with 33 additions and 0 deletions.
diff --git a/misc/cgo/test/issue9400/asm_mips64x.s b/misc/cgo/test/issue9400/asm_mips64x.s
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+// Copyright 2016 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.
+
+// +build mips64 mips64le
+// +build !gccgo
+
+#include "textflag.h"
+
+#define SYNC WORD $0xf
+
+TEXT ·RewindAndSetgid(SB),NOSPLIT|NOFRAME,$0-0
+ // Rewind stack pointer so anything that happens on the stack
+ // will clobber the test pattern created by the caller
+ ADDV $(1024*8), R29
+
+ // Ask signaller to setgid
+ MOVW $1, R1
+ SYNC
+ MOVW R1, ·Baton(SB)
+ SYNC
+
+ // Wait for setgid completion
+loop:
+ SYNC
+ MOVW ·Baton(SB), R1
+ OR R2, R2, R2 // hint that we're in a spin loop
+ BNE R1, loop
+ SYNC
+
+ // Restore stack
+ ADDV $(-1024*8), R29
+ RET