summaryrefslogtreecommitdiffstats
path: root/usr.sbin/dconschat/dconschat.8
blob: b34d968debaa7c21b13fc351c35706be99a9c01d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
.\" Copyright (c) 2003 Hidetoshi Shimokawa
.\" 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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
.\"
.\" $FreeBSD$
.\"
.\"
.Dd February 11, 2003
.Dt DCONSCHAT 8
.Os
.Sh NAME
.Nm dconschat
.Nd user interface to
.Xr dcons 4
.Sh SYNOPSIS
.Nm
.Op Fl brvwRT1
.Op Fl e Ar escape-char
.Op Fl h Ar hz
.Op Fl C Ar console_port
.Op Fl G Ar gdb_port
.Op Fl M Ar core
.Op Fl N Ar system
.Nm
.Op Fl brvwR1
.Op Fl h Ar hz
.Op Fl C Ar console_port
.Op Fl G Ar gdb_port
.Op Fl a Ar address
.Op Fl u Ar bus_num
.Fl t Ar target_eui64
.Sh DESCRIPTION
The
.Nm
utility is designed to provide a way for users to access
.Xr dcons 4
(dumb console device) on a local or remote system.
The
.Nm
utility interacts with
.Xr dcons 4
using
.Xr kvm 3
or
.Xr firewire 4 ,
and interacts with the user over TTY or TCP/IP.
To access remote
.Xr dcons 4
using
.Xr firewire 4 ,
you have to specify target EUI64 address using the
.Fl t
option. Physical DMA should be enabled on the target machine for access
via FireWire.
.Pp
The
.Nm
utility and the
.Xr dcons 4
driver communicate using 2 ports, one for the console port and another
for remote
.Xr gdb 1
port.
Users are supposed to access
.Nm
using TTY,
.Xr telnet 1
and
.Xr gdb 1 .
You can specify listen ports for console and
.Xr gdb 1
port using the
.Fl C
and
.Fl G
options respectively.
The port number 0 has special meaning that
current TTY (stdin/stdout) is used instead of TCP/IP.
A negative port number will disable the port.
By analogy with
.Xr pty 4
device, the
.Xr dcons 4
acts as a slave device and
.Nm
acts as a master device with
.Xr telnetd 8 .
.Pp
Typed characters are normally transmitted directly to
.Xr dcons 4 .
A escape character (the default is
.Ql ~
) appearing as the first character of a line is an escape signal; the
following are recognized:
.Bl -tag -width ident
.It Ic ~.
Drop the connection and exit.
.It Ic ~^G
Invoke kgdb on the terminal on which dconschat is running.
.It Ic ~^R
Reset the target over FireWire if a reset address is registered in Configuration ROM.
.It Ic ~^Z
Suspend the dconschat process.
.El
.Pp
The following options are supported.
.Pp
.Bl -tag -width indent
.It Fl b
Translate Ctrl-C to ALT_BREAK (CR +
.Ql ~
+ Ctrl-B) on
.Xr gdb 1
port.
.It Fl r
Replay old buffer on connection.
.It Fl v
Verbose debug output.
Multiple
.Fl v
options increase verbosity.
.It Fl w
Listen on a wildcard address rather than localhost.
.It Fl R
Read-only.
Do not write anything to the
.Xr dcons 4
buffer.
.It Fl T
Enable ad-hoc workaround for the TELNET protocol to
remove unnecessary byte sequences.
It should be set when you access
.Nm
using
.Xr telnet 1 .
.It Fl 1
One-shot.
Read available buffer, then exit.
This implies the
.Fl r
option.
.It Fl e Ar escape-char
Specify escape character.
The default is '~'.
.It Fl h Ar hz
Specify polling rate.
The default value is 100.
.It Fl C Ar console_port
Specify the console port.
The default value is 0 (stdin/stdout).
.It Fl G Ar gdb_port
Specify
.Xr gdb 1
port.
The default value is \-1 (disabled).
.It Fl M Ar core
Specify core file.
.It Fl N Ar system
Specify system file such as
.Pa /boot/kernel/kernel .
.It Fl t Ar target_eui64
Specify the 64-bit extended unique identifier of the target,
and use FireWire to access remote
.Xr dcons 4 .
.It Fl a Ar address
Specify the physical I/O address of the
.Xr dcons 4
buffer.
See
.Xr dcons 4
for details.
If this option is not specified,
.Nm
tries to get the address from the Configuration ROM on the target.
You are supposed to enable
.Xr dcons_crom 4
on the target to omit this option.
.It Fl u Ar bus_num
Specify FireWire bus number.
The default is 0.
.El
.Sh FILES
.Bl -tag -width indent -compact
.It Pa /dev/fwmem0.0
.It Pa /dev/mem
.It Pa /dev/kmem
.El
.Sh EXAMPLES
To use
.Nm
with FireWire for remote
.Xr dcons 4 ,
you have to specify the EUI64 of the target.
You can obtain EUI64 by running
.Xr fwcontrol 8
without options.
The first EUI64 is of the host running
.Xr fwcontrol 8
and others on the bus follow.
.Bd -literal -offset indent
# fwcontrol
2 devices (info_len=2)
node           EUI64          status
   1  77-66-55-44-33-22-11-00      0
   0  00-11-22-33-44-55-66-77      1
.Ed
.Pp
The EUI64 does not change unless you change the hardware
as the ethernet address.
.Pp
Now we can run
.Nm .
.Bd -literal -offset indent
# dconschat -br -G 12345 -t 00-11-22-33-44-55-66-77
.Ed
.Pp
You will get console output of the target and login prompt if a
.Xr getty 8
is running on
.Xr dcons 4 .
You can break to DDB with ALT_BREAK (CR +
.Ql ~
+ Ctrl-B)
if
.Dv DDB
and
.Dv ALT_BREAK_TO_DEBUGGER
are enabled in the target kernel.
To quit the session, type CR +
.Ql ~
+
.Ql \&.
in the console port.
.Pp
Using
.Xr gdb 1
port is almost the same as remote
.Xr gdb 1
over serial line except
using TCP/IP instead of
.Pa /dev/cu* .
See
.Sx "On-line Kernel Debugging Using Remote GDB"
section of
.%T "The FreeBSD Developers Handbook"
and
.Xr gdb 4
for details.
.Bd -literal -offset indent
% gdb -k kernel.debug
(kgdb) target remote :12345
.Ed
.Pp
Once
.Xr gdb 1
is attached and you specified the
.Fl b
option to
.Nm ,
typing Ctrl-C in
.Xr gdb 1
causes a break to debugger.
.Pp
The following command gets the console log from the crash dump:
.Bd -literal -offset indent
# dconschat -1 -M vmcore.0 -N kernel.0
.Ed
.Pp
If you want access to the console using
.Xr telnet 1 ,
try the following:
.Bd -literal -offset indent
# dconschat -rTC 5555 &
# telnet localhost 5555
.Ed
.Pp
You may want to keep logging console output of several machines.
.Nm conserver-com
in the Ports collection may help you.
Insert the following lines in
.Pa conserver.cf :
.Bd -literal -offset indent
console local {
	master localhost;
	type exec;
	exec /usr/sbin/dconschat -rh 25;
}
console remote {
	master localhost;
	type exec;
	exec /usr/sbin/dconschat -rh 25 -t 00-11-22-33-44-55-66-77;
}
.Ed
.Sh SEE ALSO
.Xr gdb 1 ,
.Xr telnet 1 ,
.Xr kvm 3 ,
.Xr dcons 4 ,
.Xr dcons_crom 4 ,
.Xr ddb 4 ,
.Xr firewire 4 ,
.Xr fwohci 4 ,
.Xr gdb 4 ,
.Xr eui64 5 ,
.Xr fwcontrol 8
.Sh AUTHORS
.An Hidetoshi Shimokawa Aq simokawa@FreeBSD.org
.Sh BUGS
This utility is
.Ud .
OpenPOWER on IntegriCloud