Added MI version of <sys/imgact_aout.h>, "a.out.h", which is

always compatible with the i386 version.

This fixes one of the problems I had cross-releasing i386 on
Alpha: the produced "-f aout" binaries are now identical.

usr.sbin/btxld/a.out.h

@@ -0,0 +1,86 @@
+/*-
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	from: @(#)exec.h	8.1 (Berkeley) 6/11/93
+ * from: FreeBSD: src/sys/sys/imgact_aout.h,v 1.18 2002/09/05 07:54:03 bde Exp $
+ * $FreeBSD$
+ */
+
+#include <sys/types.h>
+
+#define N_GETMAGIC(ex) \
+	( (ex).a_midmag & 0xffff )
+#define N_SETMAGIC(ex,mag,mid,flag) \
+	( (ex).a_midmag = (((flag) & 0x3f) <<26) | (((mid) & 0x03ff) << 16) | \
+	((mag) & 0xffff) )
+
+#define N_GETMAGIC_NET(ex) \
+	(ntohl((ex).a_midmag) & 0xffff)
+
+#define	__LDPGSZ	4096
+#define N_ALIGN(ex,x) \
+	(N_GETMAGIC(ex) == ZMAGIC || N_GETMAGIC(ex) == QMAGIC || \
+	 N_GETMAGIC_NET(ex) == ZMAGIC || N_GETMAGIC_NET(ex) == QMAGIC ? \
+	 ((x) + __LDPGSZ - 1) & ~(uint32_t)(__LDPGSZ - 1) : (x))
+
+/* Valid magic number check. */
+#define	N_BADMAG(ex) \
+	(N_GETMAGIC(ex) != OMAGIC && N_GETMAGIC(ex) != NMAGIC && \
+	 N_GETMAGIC(ex) != ZMAGIC && N_GETMAGIC(ex) != QMAGIC && \
+	 N_GETMAGIC_NET(ex) != OMAGIC && N_GETMAGIC_NET(ex) != NMAGIC && \
+	 N_GETMAGIC_NET(ex) != ZMAGIC && N_GETMAGIC_NET(ex) != QMAGIC)
+
+/*
+ * Header prepended to each a.out file.
+ * only manipulate the a_midmag field via the
+ * N_SETMAGIC/N_GET{MAGIC,MID,FLAG} macros in a.out.h
+ */
+
+struct exec {
+     uint32_t	a_midmag;	/* flags<<26 | mid<<16 | magic */
+     uint32_t	a_text;		/* text segment size */
+     uint32_t	a_data;		/* initialized data size */
+     uint32_t	a_bss;		/* uninitialized data size */
+     uint32_t	a_syms;		/* symbol table size */
+     uint32_t	a_entry;	/* entry point */
+     uint32_t	a_trsize;	/* text relocation size */
+     uint32_t	a_drsize;	/* data relocation size */
+};
+
+/* a_magic */
+#define	OMAGIC		0407	/* old impure format */
+#define	NMAGIC		0410	/* read-only text */
+#define	ZMAGIC		0413	/* demand load format */
+#define QMAGIC          0314    /* "compact" demand load format */
+
+/* a_mid */
+#define	MID_ZERO	0	/* unknown - implementation dependent */

usr.sbin/btxld/btxld.c

@@ -42,8 +42,7 @@ static const char rcsid[] =
 #include <string.h>
 #include <unistd.h>
 
-#include <a.out.h>
-
+#include "a.out.h"
 #include "btx.h"
 #include "elfh.h"