start of FFI support, and a demo.

R=r
DELTA=494  (492 added, 0 deleted, 2 changed)
OCL=33784
CL=33810

1 files changed, 34 insertions, 0 deletions

diff --git a/usr/rsc/fib/gcc.c b/usr/rsc/fib/gcc.c
new file mode 100644
index 000000000..a89839031
--- /dev/null
+++ b/usr/rsc/fib/gcc.c
@@ -0,0 +1,34 @@
+// 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 <stdint.h>
+
+typedef int32_t int32;
+
+static int32
+fib1(int32 n)
+{
+	int32 a, b, t;
+
+	a = 0;
+	b = 1;
+	for(; n>0; n--) {
+		t = a;
+		a = b;
+		b += t;
+	}
+	return a;
+}
+
+void
+fib(void *v)
+{
+	struct {	// 6g func(n int) int
+		int32 n;
+		int32 pad;
+		int32 ret;
+	} *args = v;
+
+	args->ret = fib1(args->n);
+}