From f974a81091d4b1de38215461940508be37379971 Mon Sep 17 00:00:00 2001
From: Bill Joy <root@ucbvax.Berkeley.EDU>
Date: Thu, 14 May 1981 22:19:40 -0800
Subject: [PATCH] date and time created 81/05/14 15:19:40 by root

SCCS-vsn: old/adb/adb.vax/access.c 4.1
---
 usr/src/old/adb/adb.vax/access.c | 135 +++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 usr/src/old/adb/adb.vax/access.c

diff --git a/usr/src/old/adb/adb.vax/access.c b/usr/src/old/adb/adb.vax/access.c
new file mode 100644
index 0000000000..f6c87bf01d
--- /dev/null
+++ b/usr/src/old/adb/adb.vax/access.c
@@ -0,0 +1,135 @@
+#
+/*
+ *
+ *	UNIX debugger
+ *
+ */
+
+#include "defs.h"
+static	char sccsid[] = "@(#)access.c 4.1 %G%";
+
+MSG		ODDADR;
+MSG		BADDAT;
+MSG		BADTXT;
+MAP		txtmap;
+MAP		datmap;
+INT		wtflag;
+STRING		errflg;
+INT		errno;
+
+INT		pid;
+
+/* file handling and access routines */
+
+put(adr,space,value)
+#ifndef EDDT
+L_INT	adr;
+{
+	access(WT,adr,space,value);
+}
+#else
+	L_INT *adr; {*adr=value;}
+#endif
+
+POS	get(adr, space)
+#ifndef EDDT
+L_INT		adr;
+{
+	return(access(RD,adr,space,0));
+}
+#else
+	L_INT *adr; {return(*adr);}
+#endif
+
+POS	chkget(n, space)
+L_INT		n;
+{
+#ifndef vax
+	REG INT		w;
+#else
+	REG L_INT	w;
+#endif
+
+	w = get(n, space);
+	chkerr();
+	return(w);
+}
+
+POS bchkget(n, space) 
+L_INT	n;
+{
+	return(chkget(n, space) & LOBYTE);
+}
+
+#ifndef EDDT
+access(mode,adr,space,value)
+L_INT	adr;
+{
+	INT	pmode,rd,file;
+	ADDR	w;
+	rd = mode==RD;
+
+	IF space == NSP THEN return(0); FI
+
+	IF pid		/* tracing on? */
+	THEN
+#ifndef vax
+		IF adr&01 ANDF !rd THEN error(ODDADR); FI
+#endif
+	     pmode = (space&DSP?(rd?RDUSER:WDUSER):(rd?RIUSER:WIUSER));
+	     w = ptrace(pmode, pid, adr, value);
+#ifndef vax
+	     IF adr&01
+	     THEN w1 = ptrace(pmode, pid, shorten(adr+1), value);
+		  w = (w>>8)&LOBYTE | (w1<<8);
+	     FI
+#endif
+	     IF errno
+	     THEN errflg = (space&DSP ? BADDAT : BADTXT);
+	     FI
+	     return(w);
+	FI
+	w = 0;
+	IF mode==WT ANDF wtflag==0
+	THEN	error("not in write mode");
+	FI
+	IF !chkmap(&adr,space)
+	THEN return(0);
+	FI
+	file=(space&DSP?datmap.ufd:txtmap.ufd);
+	IF longseek(file,adr)==0 ORF
+	   (rd ? read(file,&w,sizeof(w)) : write(file,&value,sizeof(w))) < 1
+	THEN	errflg=(space&DSP?BADDAT:BADTXT);
+	FI
+	return(w);
+
+}
+#endif
+
+chkmap(adr,space)
+	REG L_INT	*adr;
+	REG INT		space;
+{
+	REG MAPPTR amap;
+	amap=((space&DSP?&datmap:&txtmap));
+	IF space&STAR ORF !within(*adr,amap->b1,amap->e1)
+	THEN IF within(*adr,amap->b2,amap->e2)
+	     THEN *adr += (amap->f2)-(amap->b2);
+	     ELSE errflg=(space&DSP?BADDAT:BADTXT); return(0);
+	     FI
+	ELSE *adr += (amap->f1)-(amap->b1);
+	FI
+	return(1);
+}
+
+within(adr,lbd,ubd)
+POS	adr, lbd, ubd;
+{
+	return(adr>=lbd && adr<ubd);
+}
+
+longseek(f, a)
+L_INT a;
+{
+	return(lseek(f,a,0) != -1);
+}
-- 
2.20.1