1 files changed, 40 insertions, 0 deletions
diff --git a/src/runtime/cgo/gcc_stack_unix.c b/src/runtime/cgo/gcc_stack_unix.c
new file mode 100644
index 0000000000..f3fead9c9e
--- /dev/null
+++ b/src/runtime/cgo/gcc_stack_unix.c
@@ -0,0 +1,40 @@
+// Copyright 2023 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.
+
+//go:build unix && !darwin
+
+#ifndef _GNU_SOURCE // pthread_getattr_np
+#define _GNU_SOURCE
+#endif
+
+#include <pthread.h>
+#include "libcgo.h"
+
+void
+x_cgo_getstackbound(uintptr bounds[2])
+{
+	pthread_attr_t attr;
+	void *addr;
+	size_t size;
+
+#if defined(__GLIBC__) || (defined(__sun) && !defined(__illumos__))
+	// pthread_getattr_np is a GNU extension supported in glibc.
+	// Solaris is not glibc but does support pthread_getattr_np
+	// (and the fallback doesn't work...). Illumos does not.
+	pthread_getattr_np(pthread_self(), &attr);  // GNU extension
+	pthread_attr_getstack(&attr, &addr, &size); // low address
+#elif defined(__illumos__)
+	pthread_attr_init(&attr);
+	pthread_attr_get_np(pthread_self(), &attr);
+	pthread_attr_getstack(&attr, &addr, &size); // low address
+#else
+	pthread_attr_init(&attr);
+	pthread_attr_getstacksize(&attr, &size);
+	addr = __builtin_frame_address(0) + 4096 - size;
+#endif
+	pthread_attr_destroy(&attr);
+
+	bounds[0] = (uintptr)addr;
+	bounds[1] = (uintptr)addr + size;
+}