cmd,runtime: enable cgo for openbsd/arm64

Updates #31656.

Change-Id: Ide6f829282fcdf20c67998b766a201a6a92c3035
Reviewed-on: https://go-review.googlesource.com/c/go/+/174132
Run-TryBot: Ian Lance Taylor <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>

Author: 4a6f656c

src/cmd/dist/build.go

@@ -1514,7 +1514,7 @@ var cgoEnabled = map[string]bool{
 	"openbsd/386":     true,
 	"openbsd/amd64":   true,
 	"openbsd/arm":     true,
-	"openbsd/arm64":   false,
+	"openbsd/arm64":   true,
 	"plan9/386":       false,
 	"plan9/amd64":     false,
 	"plan9/arm":       false,

src/cmd/nm/nm_cgo_test.go

@@ -13,15 +13,20 @@ import (
 
 func canInternalLink() bool {
 	switch runtime.GOOS {
+	case "aix":
+		return false
 	case "dragonfly":
 		return false
 	case "linux":
 		switch runtime.GOARCH {
 		case "arm64", "mips64", "mips64le", "mips", "mipsle", "ppc64", "ppc64le":
 			return false
 		}
-	case "aix":
-		return false
+	case "openbsd":
+		switch runtime.GOARCH {
+		case "arm64":
+			return false
+		}
 	}
 	return true
 }

src/runtime/cgo/gcc_openbsd_arm64.c

@@ -0,0 +1,67 @@
+// Copyright 2019 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 <sys/types.h>
+#include <pthread.h>
+#include <signal.h>
+#include <string.h>
+#include "libcgo.h"
+#include "libcgo_unix.h"
+
+static void* threadentry(void*);
+static void (*setg_gcc)(void*);
+
+void
+x_cgo_init(G *g, void (*setg)(void*))
+{
+	pthread_attr_t attr;
+	size_t size;
+
+	setg_gcc = setg;
+	pthread_attr_init(&attr);
+	pthread_attr_getstacksize(&attr, &size);
+	g->stacklo = (uintptr)&attr - size + 4096;
+	pthread_attr_destroy(&attr);
+}
+
+void
+_cgo_sys_thread_start(ThreadStart *ts)
+{
+	pthread_attr_t attr;
+	sigset_t ign, oset;
+	pthread_t p;
+	size_t size;
+	int err;
+
+	sigfillset(&ign);
+	pthread_sigmask(SIG_SETMASK, &ign, &oset);
+
+	pthread_attr_init(&attr);
+	pthread_attr_getstacksize(&attr, &size);
+
+	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
+	ts->g->stackhi = size;
+	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
+
+	pthread_sigmask(SIG_SETMASK, &oset, nil);
+
+	if (err != 0) {
+		fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", strerror(err));
+		abort();
+	}
+}
+
+extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
+
+static void*
+threadentry(void *v)
+{
+	ThreadStart ts;
+
+	ts = *(ThreadStart*)v;
+	free(v);
+
+	crosscall1(ts.fn, setg_gcc, (void*)ts.g);
+	return nil;
+}