From 2469c867a164210ce96143517059f21db7f1fd17 Mon Sep 17 00:00:00 2001
From: rgrimes <rgrimes@FreeBSD.org>
Date: Wed, 25 May 1994 09:21:21 +0000
Subject: The big 4.4BSD Lite to FreeBSD 2.0.0 (Development) patch.

Reviewed by:	Rodney W. Grimes
Submitted by:	John Dyson and David Greenman
---
 sys/amd64/include/exec.h | 93 +++++++++++++++++++++++++++++++++++-------------
 1 file changed, 69 insertions(+), 24 deletions(-)

(limited to 'sys/amd64/include/exec.h')

diff --git a/sys/amd64/include/exec.h b/sys/amd64/include/exec.h
index eb587a4..f63ec49 100644
--- a/sys/amd64/include/exec.h
+++ b/sys/amd64/include/exec.h
@@ -33,51 +33,96 @@
  *	@(#)exec.h	8.1 (Berkeley) 6/11/93
  */
 
-/* Size of a page in an object file. */
+#ifndef	_EXEC_H_
+#define	_EXEC_H_
+
 #define	__LDPGSZ	4096
 
 /* Valid magic number check. */
 #define	N_BADMAG(ex) \
-	((ex).a_magic != NMAGIC && (ex).a_magic != OMAGIC && \
-	    (ex).a_magic != ZMAGIC)
+	(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)
+
+#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) & ~(__LDPGSZ - 1) : (x))
 
 /* Address of the bottom of the text segment. */
-#define N_TXTADDR(X)	0
+#define N_TXTADDR(ex) \
+	((N_GETMAGIC(ex) == OMAGIC || N_GETMAGIC(ex) == NMAGIC || \
+	N_GETMAGIC(ex) == ZMAGIC) ? 0 : __LDPGSZ)
 
 /* Address of the bottom of the data segment. */
 #define N_DATADDR(ex) \
-	(N_TXTADDR(ex) + ((ex).a_magic == OMAGIC ? (ex).a_text \
-	: __LDPGSZ + ((ex).a_text - 1 & ~(__LDPGSZ - 1))))
+	N_ALIGN(ex, N_TXTADDR(ex) + (ex).a_text)
+
+#define N_GETMAGIC(ex) \
+	( (ex).a_midmag & 0xffff )
+#define N_GETMID(ex) \
+	( (N_GETMAGIC_NET(ex) == ZMAGIC) ? N_GETMID_NET(ex) : \
+	((ex).a_midmag >> 16) & 0x03ff )
+#define N_GETFLAG(ex) \
+	( (N_GETMAGIC_NET(ex) == ZMAGIC) ? N_GETFLAG_NET(ex) : \
+	((ex).a_midmag >> 26) & 0x3f )
+#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 N_GETMID_NET(ex) \
+	((ntohl((ex).a_midmag) >> 16) & 0x03ff)
+#define N_GETFLAG_NET(ex) \
+	((ntohl((ex).a_midmag) >> 26) & 0x3f)
+#define N_SETMAGIC_NET(ex,mag,mid,flag) \
+	( (ex).a_midmag = htonl( (((flag)&0x3f)<<26) | (((mid)&0x03ff)<<16) | \
+	(((mag)&0xffff)) ) )
 
 /* Text segment offset. */
 #define	N_TXTOFF(ex) \
-	((ex).a_magic == ZMAGIC ? __LDPGSZ : sizeof(struct exec))
+	(N_GETMAGIC(ex) == ZMAGIC ? __LDPGSZ : (N_GETMAGIC(ex) == QMAGIC || \
+	N_GETMAGIC_NET(ex) == ZMAGIC) ? 0 : sizeof(struct exec)) 
 
 /* Data segment offset. */
 #define	N_DATOFF(ex) \
-	(N_TXTOFF(ex) + ((ex).a_magic != ZMAGIC ? (ex).a_text : \
-	__LDPGSZ + ((ex).a_text - 1 & ~(__LDPGSZ - 1))))
+	N_ALIGN(ex, N_TXTOFF(ex) + (ex).a_text)
+
+/* Relocation table offset. */
+#define N_RELOFF(ex) \
+	N_ALIGN(ex, N_DATOFF(ex) + (ex).a_data)
 
 /* Symbol table offset. */
 #define N_SYMOFF(ex) \
-	(N_TXTOFF(ex) + (ex).a_text + (ex).a_data + (ex).a_trsize + \
-	    (ex).a_drsize)
+	(N_RELOFF(ex) + (ex).a_trsize + (ex).a_drsize)
 
 /* String table offset. */
 #define	N_STROFF(ex) 	(N_SYMOFF(ex) + (ex).a_syms)
 
-/* Description of the object file header (a.out format). */
+/*
+ * 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 {
-#define	OMAGIC	0407		/* old impure format */
-#define	NMAGIC	0410		/* read-only text */
-#define	ZMAGIC	0413		/* demand load format */
-	long	a_magic;	/* magic number */
-
-	u_long	a_text;		/* text segment size */
-	u_long	a_data;		/* initialized data size */
-	u_long	a_bss;		/* uninitialized data size */
-	u_long	a_syms;		/* symbol table size */
-	u_long	a_entry;	/* entry point */
-	u_long	a_trsize;	/* text relocation size */
-	u_long	a_drsize;	/* data relocation size */
+unsigned long  a_midmag;   /* htonl(flags<<26 | mid<<16 | magic) */
+unsigned long	a_text;		/* text segment size */
+unsigned long	a_data;		/* initialized data size */
+unsigned long	a_bss;		/* uninitialized data size */
+unsigned long	a_syms;		/* symbol table size */
+unsigned long	a_entry;	/* entry point */
+unsigned long	a_trsize;	/* text relocation size */
+unsigned long	a_drsize;	/* data relocation size */
 };
+#define a_magic a_midmag /* XXX Hack to work with current kern_execve.c */
+
+/* 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 */
+
+#endif /* !_EXEC_H_ */
-- 
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