Initial revision

diff --git a/v7/src/microcode/comutl.c b/v7/src/microcode/comutl.c
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+/* -*-C-*-
+
+$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/microcode/comutl.c,v 1.1 1987/06/04 00:07:18 cph Exp $
+
+Copyright (c) 1987 Massachusetts Institute of Technology
+
+This material was developed by the Scheme project at the Massachusetts
+Institute of Technology, Department of Electrical Engineering and
+Computer Science.  Permission to copy this software, to redistribute
+it, and to use it for any purpose is granted, subject to the following
+restrictions and understandings.
+
+1. Any copy made of this software must include this copyright notice
+in full.
+
+2. Users of this software agree to make their best efforts (a) to
+return to the MIT Scheme project any improvements or extensions that
+they make, so that these may be included in future releases; and (b)
+to inform MIT of noteworthy uses of this software.
+
+3. All materials developed as a consequence of the use of this
+software shall duly acknowledge such use, in accordance with the usual
+standards of acknowledging credit in academic research.
+
+4. MIT has made no warrantee or representation that the operation of
+this software will be error-free, and MIT is under no obligation to
+provide any services, by way of maintenance, update, or otherwise.
+
+5. In conjunction with products arising from the use of this material,
+there shall be no use of the name of the Massachusetts Institute of
+Technology nor of any adaptation thereof in any advertising,
+promotional, or sales literature without prior written consent from
+MIT in each case. */
+
+/* Compiled Code Utilities */
+
+#include "scheme.h"
+#include "primitive.h"
+#include "gccode.h"
+\f
+#define RETURN_ADDRESS_P(object)                                       \
+  ((OBJECT_TYPE (object)) == TC_RETURN_ADDRESS)
+
+Built_In_Primitive (Prim_return_address_block, 1, "RETURN-ADDRESS-BLOCK", 0xB5)
+{
+  Pointer *address;
+  Primitive_1_Arg ();
+
+#ifdef CMPGCFILE
+  CHECK_ARG (1, RETURN_ADDRESS_P);
+  address = (Get_Pointer (Arg1));
+  return (Make_Pointer (TC_VECTOR, (Get_Compiled_Block (address))));
+#else /* not CMPGCFILE */
+  error_external_error ();
+#endif /* CMPGCFILE */
+}