Imported Upstream version 1.4upstream/1.4

1 files changed, 119 insertions, 0 deletions

diff --git a/src/runtime/cgo/gcc_darwin_amd64.c b/src/runtime/cgo/gcc_darwin_amd64.c
new file mode 100644
index 000000000..dc679acab
--- /dev/null
+++ b/src/runtime/cgo/gcc_darwin_amd64.c
@@ -0,0 +1,119 @@
+// Copyright 2009 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 <string.h> /* for strerror */
+#include <pthread.h>
+#include <signal.h>
+#include "libcgo.h"
+
+static void* threadentry(void*);
+static pthread_key_t k1;
+
+#define magic1 (0x23581321345589ULL)
+
+static void
+inittls(void)
+{
+	uint64 x;
+	pthread_key_t tofree[128], k;
+	int i, ntofree;
+
+	/*
+	 * Same logic, code as darwin_386.c:/inittls, except that words
+	 * are 8 bytes long now, and the thread-local storage starts
+	 * at 0x60 on Leopard / Snow Leopard. So the offset is
+	 * 0x60+8*0x108 = 0x8a0.
+	 *
+	 * The linker and runtime hard-code this constant offset
+	 * from %gs where we expect to find g.
+	 * Known to ../../../liblink/sym.c:/8a0
+	 * and to ../sys_darwin_amd64.s:/8a0
+	 *
+	 * As disgusting as on the 386; same justification.
+	 */
+	ntofree = 0;
+	for(;;) {
+		if(pthread_key_create(&k, nil) < 0) {
+			fprintf(stderr, "runtime/cgo: pthread_key_create failed\n");
+			abort();
+		}
+		pthread_setspecific(k, (void*)magic1);
+		asm volatile("movq %%gs:0x8a0, %0" : "=r"(x));
+		pthread_setspecific(k, 0);
+		if(x == magic1) {
+			k1 = k;
+			break;
+		}
+		if(ntofree >= nelem(tofree)) {
+			fprintf(stderr, "runtime/cgo: could not obtain pthread_keys\n");
+			fprintf(stderr, "\ttried");
+			for(i=0; i<ntofree; i++)
+				fprintf(stderr, " %#x", (unsigned)tofree[i]);
+			fprintf(stderr, "\n");
+			abort();
+		}
+		tofree[ntofree++] = k;
+	}
+
+	/*
+	 * We got the key we wanted.  Free the others.
+	 */
+	for(i=0; i<ntofree; i++)
+		pthread_key_delete(tofree[i]);
+}
+
+void
+x_cgo_init(G *g)
+{
+	pthread_attr_t attr;
+	size_t size;
+
+	pthread_attr_init(&attr);
+	pthread_attr_getstacksize(&attr, &size);
+	g->stacklo = (uintptr)&attr - size + 4096;
+	pthread_attr_destroy(&attr);
+
+	inittls();
+}
+
+
+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; mstack will do the rest.
+	ts->g->stackhi = size;
+	err = 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();
+	}
+}
+
+static void*
+threadentry(void *v)
+{
+	ThreadStart ts;
+
+	ts = *(ThreadStart*)v;
+	free(v);
+
+	pthread_setspecific(k1, (void*)ts.g);
+
+	crosscall_amd64(ts.fn);
+	return nil;
+}