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Diffstat (limited to 'src/pkg/runtime/cgo/darwin_amd64.c')
-rw-r--r--src/pkg/runtime/cgo/darwin_amd64.c119
1 files changed, 119 insertions, 0 deletions
diff --git a/src/pkg/runtime/cgo/darwin_amd64.c b/src/pkg/runtime/cgo/darwin_amd64.c
new file mode 100644
index 000000000..3471044c0
--- /dev/null
+++ b/src/pkg/runtime/cgo/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 <pthread.h>
+#include "libcgo.h"
+
+static void* threadentry(void*);
+static pthread_key_t k1, k2;
+
+#define magic1 (0x23581321345589ULL)
+
+static void
+inittls(void)
+{
+ uint64 x, y;
+ pthread_key_t tofree[128], k;
+ int i, ntofree;
+ int havek1, havek2;
+
+ /*
+ * 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 offsets are
+ * 0x60+8*0x108 = 0x8a0 and 0x60+8*0x109 = 0x8a8.
+ *
+ * The linker and runtime hard-code these constant offsets
+ * from %gs where we expect to find m and g.
+ * Known to ../cmd/6l/obj.c:/8a0
+ * and to ../pkg/runtime/darwin/amd64/sys.s:/8a0
+ *
+ * As disgusting as on the 386; same justification.
+ */
+ havek1 = 0;
+ havek2 = 0;
+ ntofree = 0;
+ while(!havek1 || !havek2) {
+ 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));
+ asm volatile("movq %%gs:0x8a8, %0" : "=r"(y));
+ if(x == magic1) {
+ havek1 = 1;
+ k1 = k;
+ } else if(y == magic1) {
+ havek2 = 1;
+ k2 = k;
+ } else {
+ 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;
+ }
+ pthread_setspecific(k, 0);
+ }
+
+ /*
+ * We got the keys we wanted. Free the others.
+ */
+ for(i=0; i<ntofree; i++)
+ pthread_key_delete(tofree[i]);
+}
+
+void
+xinitcgo(void)
+{
+ inittls();
+}
+
+void (*initcgo) = xinitcgo;
+
+void
+libcgo_sys_thread_start(ThreadStart *ts)
+{
+ pthread_attr_t attr;
+ pthread_t p;
+ size_t size;
+ int err;
+
+ pthread_attr_init(&attr);
+ pthread_attr_getstacksize(&attr, &size);
+ ts->g->stackguard = size;
+ err = pthread_create(&p, &attr, threadentry, ts);
+ 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);
+
+ ts.g->stackbase = (uintptr)&ts;
+
+ /*
+ * libcgo_sys_thread_start set stackguard to stack size;
+ * change to actual guard pointer.
+ */
+ ts.g->stackguard = (uintptr)&ts - ts.g->stackguard + 4096;
+
+ pthread_setspecific(k1, (void*)ts.g);
+ pthread_setspecific(k2, (void*)ts.m);
+
+ crosscall_amd64(ts.fn);
+ return nil;
+}