> Would be most excellent if this could be done. A couple of boxen I
> have here have serial consoles attached to other machines which
> do a very good simulation of a break when the controlling process
> leaves them. Dropping to DDB every time you reboot the other machine
> is, uh, less than desirable behaviour. :-)
I had the same problem. Changing the sio code to require three breaks
inside a 10 seconds interval before dropping into the debugger reduced
the problem for me.
- Tor Egge
Index: sys/i386/conf/options.i386
===================================================================
RCS file: /home/ncvs/src/sys/i386/conf/options.i386,v
retrieving revision 1.116
diff -u -r1.116 options.i386
--- options.i386 1999/06/06 22:45:04 1.116
+++ options.i386 1999/06/08 00:27:17
@@ -24,6 +24,7 @@
AUTO_EOI_1 opt_auto_eoi.h
AUTO_EOI_2 opt_auto_eoi.h
BREAK_TO_DEBUGGER opt_comconsole.h
+TRIPLE_BREAK_TO_DEBUGGER opt_comconsole.h
CONSPEED opt_comconsole.h
I586_PMC_GUPROF opt_i586_guprof.h
WLCACHE opt_wavelan.h
Index: sys/isa/sio.c
===================================================================
RCS file: /home/ncvs/src/sys/isa/sio.c,v
retrieving revision 1.246
diff -u -r1.246 sio.c
--- sio.c 1999/05/31 06:57:31 1.246
+++ sio.c 1999/06/08 00:27:38
@@ -427,6 +427,16 @@
{ -1, -1 }
};
+#define DDB_BREAK_MASK (IER_ERXRDY | IER_ETXRDY | IER_ERLS | IER_EMSC)
+
+#ifdef TRIPLE_BREAK_TO_DEBUGGER
+#ifndef TRIPLE_BREAK_TIMEOUT
+#define TRIPLE_BREAK_TIMEOUT 10
+#endif
+int triple_break_count; /* number of breaks detected */
+int triple_break_time; /* time_second sampled at first break */
+#endif
+
#ifdef COM_ESP
/* XXX configure this properly. */
static Port_t likely_com_ports[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, };
@@ -998,6 +1008,9 @@
com->lt_out.c_ispeed = com->lt_out.c_ospeed =
com->lt_in.c_ispeed = com->lt_in.c_ospeed =
com->it_in.c_ispeed = com->it_in.c_ospeed = comdefaultrate;
+#if defined(DDB) && defined(BREAK_TO_DEBUGGER) && defined(DDB_BREAK_MASK)
+ outb(iobase + com_ier, DDB_BREAK_MASK);
+#endif
} else
com->it_in.c_ispeed = com->it_in.c_ospeed = TTYDEF_SPEED;
if (siosetwater(com, com->it_in.c_ispeed) != 0) {
@@ -1404,7 +1417,12 @@
com->pps.ppsparam.mode = 0;
outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
{
- outb(iobase + com_ier, 0);
+#if defined(DDB) && defined(BREAK_TO_DEBUGGER) && defined(DDB_BREAK_MASK)
+ if (com->unit == comconsole)
+ outb(iobase + com_ier, DDB_BREAK_MASK);
+ else
+#endif
+ outb(iobase + com_ier, 0);
tp = com->tp;
if (tp->t_cflag & HUPCL
/*
@@ -1704,7 +1722,23 @@
if (line_status & LSR_BI) {
#if defined(DDB) && defined(BREAK_TO_DEBUGGER)
if (com->unit == comconsole) {
+#ifdef TRIPLE_BREAK_TO_DEBUGGER
+ if (time_second >
+ triple_break_time +
+ TRIPLE_BREAK_TIMEOUT)
+ triple_break_count = 0;
+ triple_break_count++;
+ if (triple_break_count == 1)
+ triple_break_time =
+ time_second;
+ else if (triple_break_count
+ == 3) {
+ triple_break_count = 0;
+ breakpoint();
+ }
+#else
breakpoint();
+#endif
goto cont;
}
#endif
