bc093719ca
The last half year I've been working on a replacement TTY layer for the FreeBSD kernel. The new TTY layer was designed to improve the following: - Improved driver model: The old TTY layer has a driver model that is not abstract enough to make it friendly to use. A good example is the output path, where the device drivers directly access the output buffers. This means that an in-kernel PPP implementation must always convert network buffers into TTY buffers. If a PPP implementation would be built on top of the new TTY layer (still needs a hooks layer, though), it would allow the PPP implementation to directly hand the data to the TTY driver. - Improved hotplugging: With the old TTY layer, it isn't entirely safe to destroy TTY's from the system. This implementation has a two-step destructing design, where the driver first abandons the TTY. After all threads have left the TTY, the TTY layer calls a routine in the driver, which can be used to free resources (unit numbers, etc). The pts(4) driver also implements this feature, which means posix_openpt() will now return PTY's that are created on the fly. - Improved performance: One of the major improvements is the per-TTY mutex, which is expected to improve scalability when compared to the old Giant locking. Another change is the unbuffered copying to userspace, which is both used on TTY device nodes and PTY masters. Upgrading should be quite straightforward. Unlike previous versions, existing kernel configuration files do not need to be changed, except when they reference device drivers that are listed in UPDATING. Obtained from: //depot/projects/mpsafetty/... Approved by: philip (ex-mentor) Discussed: on the lists, at BSDCan, at the DevSummit Sponsored by: Snow B.V., the Netherlands dcons(4) fixed by: kan
1422 lines
32 KiB
Groff
1422 lines
32 KiB
Groff
.\"
|
|
.\" Mach Operating System
|
|
.\" Copyright (c) 1991,1990 Carnegie Mellon University
|
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.\" Copyright (c) 2007 Robert N. M. Watson
|
|
.\" All Rights Reserved.
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.\"
|
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.\" Permission to use, copy, modify and distribute this software and its
|
|
.\" documentation is hereby granted, provided that both the copyright
|
|
.\" notice and this permission notice appear in all copies of the
|
|
.\" software, derivative works or modified versions, and any portions
|
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.\" thereof, and that both notices appear in supporting documentation.
|
|
.\"
|
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.\" CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
|
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.\" CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
|
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.\" ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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.\"
|
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.\" Carnegie Mellon requests users of this software to return to
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.\"
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.\" Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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.\" School of Computer Science
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.\" Carnegie Mellon University
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.\" Pittsburgh PA 15213-3890
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.\"
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.\" any improvements or extensions that they make and grant Carnegie Mellon
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.\" the rights to redistribute these changes.
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.\"
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.\" changed a \# to #, since groff choked on it.
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.\"
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.\" HISTORY
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.\" ddb.4,v
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|
.\" Revision 1.1 1993/07/15 18:41:02 brezak
|
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.\" Man page for DDB
|
|
.\"
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.\" Revision 2.6 92/04/08 08:52:57 rpd
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.\" Changes from OSF.
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.\" [92/01/17 14:19:22 jsb]
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.\" Changes for OSF debugger modifications.
|
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.\" [91/12/12 tak]
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|
.\"
|
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.\" Revision 2.5 91/06/25 13:50:22 rpd
|
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.\" Added some watchpoint explanation.
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.\" [91/06/25 rpd]
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|
.\"
|
|
.\" Revision 2.4 91/06/17 15:47:31 jsb
|
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.\" Added documentation for continue/c, match, search, and watchpoints.
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|
.\" I've not actually explained what a watchpoint is; maybe Rich can
|
|
.\" do that (hint, hint).
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.\" [91/06/17 10:58:08 jsb]
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.\"
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.\" Revision 2.3 91/05/14 17:04:23 mrt
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|
.\" Correcting copyright
|
|
.\"
|
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.\" Revision 2.2 91/02/14 14:10:06 mrt
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.\" Changed to new Mach copyright
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.\" [91/02/12 18:10:12 mrt]
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.\"
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.\" Revision 2.2 90/08/30 14:23:15 dbg
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.\" Created.
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.\" [90/08/30 dbg]
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.\"
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.\" $FreeBSD$
|
|
.\"
|
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.Dd August 20, 2008
|
|
.Dt DDB 4
|
|
.Os
|
|
.Sh NAME
|
|
.Nm ddb
|
|
.Nd interactive kernel debugger
|
|
.Sh SYNOPSIS
|
|
In order to enable kernel debugging facilities include:
|
|
.Bd -ragged -offset indent
|
|
.Cd options KDB
|
|
.Cd options DDB
|
|
.Ed
|
|
.Pp
|
|
To prevent activation of the debugger on kernel
|
|
.Xr panic 9 :
|
|
.Bd -ragged -offset indent
|
|
.Cd options KDB_UNATTENDED
|
|
.Ed
|
|
.Pp
|
|
In order to print a stack trace of the current thread on the console
|
|
for a panic:
|
|
.Bd -ragged -offset indent
|
|
.Cd options KDB_TRACE
|
|
.Ed
|
|
.Pp
|
|
To print the numerical value of symbols in addition to the symbolic
|
|
representation, define:
|
|
.Bd -ragged -offset indent
|
|
.Cd options DDB_NUMSYM
|
|
.Ed
|
|
.Pp
|
|
To enable the
|
|
.Xr gdb 1
|
|
backend, so that remote debugging with
|
|
.Xr kgdb 1
|
|
is possible, include:
|
|
.Bd -ragged -offset indent
|
|
.Cd options GDB
|
|
.Ed
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
kernel debugger has most of the features of the old
|
|
.Nm kdb ,
|
|
but with a more rational syntax
|
|
inspired by
|
|
.Xr gdb 1 .
|
|
If linked into the running kernel,
|
|
it can be invoked locally with the
|
|
.Ql debug
|
|
.Xr keymap 5
|
|
action.
|
|
The debugger is also invoked on kernel
|
|
.Xr panic 9
|
|
if the
|
|
.Va debug.debugger_on_panic
|
|
.Xr sysctl 8
|
|
MIB variable is set non-zero,
|
|
which is the default
|
|
unless the
|
|
.Dv KDB_UNATTENDED
|
|
option is specified.
|
|
.Pp
|
|
The current location is called
|
|
.Va dot .
|
|
The
|
|
.Va dot
|
|
is displayed with
|
|
a hexadecimal format at a prompt.
|
|
The commands
|
|
.Ic examine
|
|
and
|
|
.Ic write
|
|
update
|
|
.Va dot
|
|
to the address of the last line
|
|
examined or the last location modified, and set
|
|
.Va next
|
|
to the address of
|
|
the next location to be examined or changed.
|
|
Other commands do not change
|
|
.Va dot ,
|
|
and set
|
|
.Va next
|
|
to be the same as
|
|
.Va dot .
|
|
.Pp
|
|
The general command syntax is:
|
|
.Ar command Ns Op Li / Ns Ar modifier
|
|
.Ar address Ns Op Li , Ns Ar count
|
|
.Pp
|
|
A blank line repeats the previous command from the address
|
|
.Va next
|
|
with
|
|
count 1 and no modifiers.
|
|
Specifying
|
|
.Ar address
|
|
sets
|
|
.Va dot
|
|
to the address.
|
|
Omitting
|
|
.Ar address
|
|
uses
|
|
.Va dot .
|
|
A missing
|
|
.Ar count
|
|
is taken
|
|
to be 1 for printing commands or infinity for stack traces.
|
|
.Pp
|
|
The
|
|
.Nm
|
|
debugger has a pager feature (like the
|
|
.Xr more 1
|
|
command)
|
|
for the output.
|
|
If an output line exceeds the number set in the
|
|
.Va lines
|
|
variable, it displays
|
|
.Dq Li --More--
|
|
and waits for a response.
|
|
The valid responses for it are:
|
|
.Pp
|
|
.Bl -tag -compact -width ".Li SPC"
|
|
.It Li SPC
|
|
one more page
|
|
.It Li RET
|
|
one more line
|
|
.It Li q
|
|
abort the current command, and return to the command input mode
|
|
.El
|
|
.Pp
|
|
Finally,
|
|
.Nm
|
|
provides a small (currently 10 items) command history, and offers
|
|
simple
|
|
.Nm emacs Ns -style
|
|
command line editing capabilities.
|
|
In addition to
|
|
the
|
|
.Nm emacs
|
|
control keys, the usual
|
|
.Tn ANSI
|
|
arrow keys might be used to
|
|
browse through the history buffer, and move the cursor within the
|
|
current line.
|
|
.Sh COMMANDS
|
|
.Bl -tag -width indent -compact
|
|
.It Ic examine
|
|
.It Ic x
|
|
Display the addressed locations according to the formats in the modifier.
|
|
Multiple modifier formats display multiple locations.
|
|
If no format is specified, the last format specified for this command
|
|
is used.
|
|
.Pp
|
|
The format characters are:
|
|
.Bl -tag -compact -width indent
|
|
.It Cm b
|
|
look at by bytes (8 bits)
|
|
.It Cm h
|
|
look at by half words (16 bits)
|
|
.It Cm l
|
|
look at by long words (32 bits)
|
|
.It Cm a
|
|
print the location being displayed
|
|
.It Cm A
|
|
print the location with a line number if possible
|
|
.It Cm x
|
|
display in unsigned hex
|
|
.It Cm z
|
|
display in signed hex
|
|
.It Cm o
|
|
display in unsigned octal
|
|
.It Cm d
|
|
display in signed decimal
|
|
.It Cm u
|
|
display in unsigned decimal
|
|
.It Cm r
|
|
display in current radix, signed
|
|
.It Cm c
|
|
display low 8 bits as a character.
|
|
Non-printing characters are displayed as an octal escape code (e.g.,
|
|
.Ql \e000 ) .
|
|
.It Cm s
|
|
display the null-terminated string at the location.
|
|
Non-printing characters are displayed as octal escapes.
|
|
.It Cm m
|
|
display in unsigned hex with character dump at the end of each line.
|
|
The location is also displayed in hex at the beginning of each line.
|
|
.It Cm i
|
|
display as an instruction
|
|
.It Cm I
|
|
display as an instruction with possible alternate formats depending on the
|
|
machine:
|
|
.Bl -tag -width ".Tn powerpc" -compact
|
|
.It Tn alpha
|
|
Show the registers of the instruction.
|
|
.It Tn amd64
|
|
No alternate format.
|
|
.It Tn i386
|
|
No alternate format.
|
|
.It Tn ia64
|
|
No alternate format.
|
|
.It Tn powerpc
|
|
No alternate format.
|
|
.It Tn sparc64
|
|
No alternate format.
|
|
.El
|
|
.It Cm S
|
|
display a symbol name for the pointer stored at the address
|
|
.El
|
|
.Pp
|
|
.It Ic xf
|
|
Examine forward:
|
|
execute an
|
|
.Ic examine
|
|
command with the last specified parameters to it
|
|
except that the next address displayed by it is used as the start address.
|
|
.Pp
|
|
.It Ic xb
|
|
Examine backward:
|
|
execute an
|
|
.Ic examine
|
|
command with the last specified parameters to it
|
|
except that the last start address subtracted by the size displayed by it
|
|
is used as the start address.
|
|
.Pp
|
|
.It Ic print Ns Op Li / Ns Cm acdoruxz
|
|
.It Ic p Ns Op Li / Ns Cm acdoruxz
|
|
Print
|
|
.Ar addr Ns s
|
|
according to the modifier character (as described above for
|
|
.Cm examine ) .
|
|
Valid formats are:
|
|
.Cm a , x , z , o , d , u , r ,
|
|
and
|
|
.Cm c .
|
|
If no modifier is specified, the last one specified to it is used.
|
|
The argument
|
|
.Ar addr
|
|
can be a string, in which case it is printed as it is.
|
|
For example:
|
|
.Bd -literal -offset indent
|
|
print/x "eax = " $eax "\enecx = " $ecx "\en"
|
|
.Ed
|
|
.Pp
|
|
will print like:
|
|
.Bd -literal -offset indent
|
|
eax = xxxxxx
|
|
ecx = yyyyyy
|
|
.Ed
|
|
.Pp
|
|
.It Xo
|
|
.Ic write Ns Op Li / Ns Cm bhl
|
|
.Ar addr expr1 Op Ar expr2 ...
|
|
.Xc
|
|
.It Xo
|
|
.Ic w Ns Op Li / Ns Cm bhl
|
|
.Ar addr expr1 Op Ar expr2 ...
|
|
.Xc
|
|
Write the expressions specified after
|
|
.Ar addr
|
|
on the command line at succeeding locations starting with
|
|
.Ar addr .
|
|
The write unit size can be specified in the modifier with a letter
|
|
.Cm b
|
|
(byte),
|
|
.Cm h
|
|
(half word) or
|
|
.Cm l
|
|
(long word) respectively.
|
|
If omitted,
|
|
long word is assumed.
|
|
.Pp
|
|
.Sy Warning :
|
|
since there is no delimiter between expressions, strange
|
|
things may happen.
|
|
It is best to enclose each expression in parentheses.
|
|
.Pp
|
|
.It Ic set Li $ Ns Ar variable Oo Li = Oc Ar expr
|
|
Set the named variable or register with the value of
|
|
.Ar expr .
|
|
Valid variable names are described below.
|
|
.Pp
|
|
.It Ic break Ns Op Li / Ns Cm u
|
|
.It Ic b Ns Op Li / Ns Cm u
|
|
Set a break point at
|
|
.Ar addr .
|
|
If
|
|
.Ar count
|
|
is supplied, continues
|
|
.Ar count
|
|
\- 1 times before stopping at the
|
|
break point.
|
|
If the break point is set, a break point number is
|
|
printed with
|
|
.Ql # .
|
|
This number can be used in deleting the break point
|
|
or adding conditions to it.
|
|
.Pp
|
|
If the
|
|
.Cm u
|
|
modifier is specified, this command sets a break point in user
|
|
address space.
|
|
Without the
|
|
.Cm u
|
|
option, the address is considered to be in the kernel
|
|
space, and a wrong space address is rejected with an error message.
|
|
This modifier can be used only if it is supported by machine dependent
|
|
routines.
|
|
.Pp
|
|
.Sy Warning :
|
|
If a user text is shadowed by a normal user space debugger,
|
|
user space break points may not work correctly.
|
|
Setting a break
|
|
point at the low-level code paths may also cause strange behavior.
|
|
.Pp
|
|
.It Ic delete Ar addr
|
|
.It Ic d Ar addr
|
|
.It Ic delete Li # Ns Ar number
|
|
.It Ic d Li # Ns Ar number
|
|
Delete the break point.
|
|
The target break point can be specified by a
|
|
break point number with
|
|
.Ql # ,
|
|
or by using the same
|
|
.Ar addr
|
|
specified in the original
|
|
.Ic break
|
|
command.
|
|
.Pp
|
|
.It Ic watch Ar addr Ns Li , Ns Ar size
|
|
Set a watchpoint for a region.
|
|
Execution stops when an attempt to modify the region occurs.
|
|
The
|
|
.Ar size
|
|
argument defaults to 4.
|
|
If you specify a wrong space address, the request is rejected
|
|
with an error message.
|
|
.Pp
|
|
.Sy Warning :
|
|
Attempts to watch wired kernel memory
|
|
may cause unrecoverable error in some systems such as i386.
|
|
Watchpoints on user addresses work best.
|
|
.Pp
|
|
.It Ic hwatch Ar addr Ns Li , Ns Ar size
|
|
Set a hardware watchpoint for a region if supported by the
|
|
architecture.
|
|
Execution stops when an attempt to modify the region occurs.
|
|
The
|
|
.Ar size
|
|
argument defaults to 4.
|
|
.Pp
|
|
.Sy Warning :
|
|
The hardware debug facilities do not have a concept of separate
|
|
address spaces like the watch command does.
|
|
Use
|
|
.Ic hwatch
|
|
for setting watchpoints on kernel address locations only, and avoid
|
|
its use on user mode address spaces.
|
|
.Pp
|
|
.It Ic dhwatch Ar addr Ns Li , Ns Ar size
|
|
Delete specified hardware watchpoint.
|
|
.Pp
|
|
.It Ic step Ns Op Li / Ns Cm p
|
|
.It Ic s Ns Op Li / Ns Cm p
|
|
Single step
|
|
.Ar count
|
|
times (the comma is a mandatory part of the syntax).
|
|
If the
|
|
.Cm p
|
|
modifier is specified, print each instruction at each step.
|
|
Otherwise, only print the last instruction.
|
|
.Pp
|
|
.Sy Warning :
|
|
depending on machine type, it may not be possible to
|
|
single-step through some low-level code paths or user space code.
|
|
On machines with software-emulated single-stepping (e.g., pmax),
|
|
stepping through code executed by interrupt handlers will probably
|
|
do the wrong thing.
|
|
.Pp
|
|
.It Ic continue Ns Op Li / Ns Cm c
|
|
.It Ic c Ns Op Li / Ns Cm c
|
|
Continue execution until a breakpoint or watchpoint.
|
|
If the
|
|
.Cm c
|
|
modifier is specified, count instructions while executing.
|
|
Some machines (e.g., pmax) also count loads and stores.
|
|
.Pp
|
|
.Sy Warning :
|
|
when counting, the debugger is really silently single-stepping.
|
|
This means that single-stepping on low-level code may cause strange
|
|
behavior.
|
|
.Pp
|
|
.It Ic until Ns Op Li / Ns Cm p
|
|
Stop at the next call or return instruction.
|
|
If the
|
|
.Cm p
|
|
modifier is specified, print the call nesting depth and the
|
|
cumulative instruction count at each call or return.
|
|
Otherwise,
|
|
only print when the matching return is hit.
|
|
.Pp
|
|
.It Ic next Ns Op Li / Ns Cm p
|
|
.It Ic match Ns Op Li / Ns Cm p
|
|
Stop at the matching return instruction.
|
|
If the
|
|
.Cm p
|
|
modifier is specified, print the call nesting depth and the
|
|
cumulative instruction count at each call or return.
|
|
Otherwise, only print when the matching return is hit.
|
|
.Pp
|
|
.It Xo
|
|
.Ic trace Ns Op Li / Ns Cm u
|
|
.Op Ar pid | tid
|
|
.Op Li , Ns Ar count
|
|
.Xc
|
|
.It Xo
|
|
.Ic t Ns Op Li / Ns Cm u
|
|
.Op Ar pid | tid
|
|
.Op Li , Ns Ar count
|
|
.Xc
|
|
.It Xo
|
|
.Ic where Ns Op Li / Ns Cm u
|
|
.Op Ar pid | tid
|
|
.Op Li , Ns Ar count
|
|
.Xc
|
|
.It Xo
|
|
.Ic bt Ns Op Li / Ns Cm u
|
|
.Op Ar pid | tid
|
|
.Op Li , Ns Ar count
|
|
.Xc
|
|
Stack trace.
|
|
The
|
|
.Cm u
|
|
option traces user space; if omitted,
|
|
.Ic trace
|
|
only traces
|
|
kernel space.
|
|
The optional argument
|
|
.Ar count
|
|
is the number of frames to be traced.
|
|
If
|
|
.Ar count
|
|
is omitted, all frames are printed.
|
|
.Pp
|
|
.Sy Warning :
|
|
User space stack trace is valid
|
|
only if the machine dependent code supports it.
|
|
.Pp
|
|
.It Xo
|
|
.Ic search Ns Op Li / Ns Cm bhl
|
|
.Ar addr
|
|
.Ar value
|
|
.Op Ar mask
|
|
.Op Li , Ns Ar count
|
|
.Xc
|
|
Search memory for
|
|
.Ar value .
|
|
This command might fail in interesting
|
|
ways if it does not find the searched-for value.
|
|
This is because
|
|
.Nm
|
|
does not always recover from touching bad memory.
|
|
The optional
|
|
.Ar count
|
|
argument limits the search.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm all procs Ns Op Li / Ns Cm m
|
|
.It Ic ps Ns Op Li / Ns Cm m
|
|
Display all process information.
|
|
The process information may not be shown if it is not
|
|
supported in the machine, or the bottom of the stack of the
|
|
target process is not in the main memory at that time.
|
|
The
|
|
.Cm m
|
|
modifier will alter the display to show VM map
|
|
addresses for the process and not show other information.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm allchains
|
|
Show the same information like "show lockchain" does, but
|
|
for every thread in the system.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm alllocks
|
|
Show all locks that are currently held.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm allpcpu
|
|
The same as "show pcpu", but for every CPU present in the system.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm allrman
|
|
Show information related with resource management, including
|
|
interrupt request lines, DMA request lines, I/O ports and I/O memory
|
|
addresses.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm apic
|
|
Dump data about APIC IDT vector mappings.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm breaks
|
|
Show breakpoints set with the "break" command.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm buffer
|
|
Show buffer structure of
|
|
.Vt struct buf
|
|
type.
|
|
Such a structure is used within the
|
|
.Fx
|
|
kernel for the I/O subsystem
|
|
implementation.
|
|
For an exact interpretation of the output, please see the
|
|
.Pa sys/buf.h
|
|
header file.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm cbstat
|
|
Show brief information about the TTY subsystem.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm conifhk
|
|
Lists hooks currently waiting for completion in
|
|
run_interrupt_driven_config_hooks().
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm cpusets
|
|
Print numbered root and assigned CPU affinity sets.
|
|
See
|
|
.Xr cpuset 2
|
|
for more details.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm cyrixreg
|
|
Show registers specific to the Cyrix processor.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm domain Ar addr
|
|
Print protocol domain structure
|
|
.Vt struct domain
|
|
at address
|
|
.Ar addr .
|
|
See the
|
|
.Pa sys/domain.h
|
|
header file for more details on the exact meaning of the structure fields.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm file Ar addr
|
|
Show information about the file structure
|
|
.Vt struct file
|
|
present at address
|
|
.Ar addr .
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm files
|
|
Show information about every file structure in the system.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm freepages
|
|
Show the number of physical pages in each of the free lists.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm geom Op Ar addr
|
|
If the
|
|
.Ar addr
|
|
argument is not given, displays the entire GEOM topology.
|
|
If
|
|
.Ar addr
|
|
is given, displays details about the given GEOM object (class, geom,
|
|
provider or consumer).
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm idt
|
|
Show IDT layout.
|
|
The first column specifies the IDT vector.
|
|
The second one is the name of the interrupt/trap handler.
|
|
Those functions are machine dependent.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm inpcb Ar addr
|
|
Show information on IP Control Block
|
|
.Vt struct in_pcb
|
|
present at
|
|
.Ar addr .
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm intr
|
|
Dump information about interrupt handlers.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm intrcnt
|
|
Dump the interrupt statistics.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm irqs
|
|
Show interrupt lines and their respective kernel threads.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm lapic
|
|
Show information from the local APIC registers for this CPU.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm lock Ar addr
|
|
Show lock structure.
|
|
The output format is as follows:
|
|
.Bl -tag -offset 0 -width "flags"
|
|
.It Ic class:
|
|
Class of the lock.
|
|
Possible types include
|
|
.Xr mutex 9 ,
|
|
.Xr rmlock 9 ,
|
|
.Xr rwlock 9 ,
|
|
.Xr sx 9 .
|
|
.It Ic name:
|
|
Name of the lock.
|
|
.It Ic flags:
|
|
Flags passed to the lock initialization function.
|
|
For exact possibilities see manual pages of possible lock types.
|
|
.It Ic state:
|
|
Current state of a lock.
|
|
As well as
|
|
.Ic flags
|
|
it's lock-specific.
|
|
.It Ic owner:
|
|
Lock owner.
|
|
.El
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm lockchain Ar addr
|
|
Show all threads a particular thread at address
|
|
.Ar addr
|
|
is waiting on based on non-sleepable and non-spin locks.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm lockedbufs
|
|
Show the same information as "show buf", but for every locked
|
|
.Vt struct buf
|
|
object.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm lockedvnods
|
|
List all locked vnodes in the system.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm locks
|
|
Prints all locks that are currently acquired.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm locktree
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm malloc
|
|
Prints
|
|
.Xr malloc 9
|
|
memory allocator statistics.
|
|
The output format is as follows:
|
|
.Pp
|
|
.Bl -tag -compact -offset indent -width "Requests"
|
|
.It Ic Type
|
|
Specifies a type of memory.
|
|
It is the same as a description string used while defining the
|
|
given memory type with
|
|
.Xr MALLOC_DECLARE 9 .
|
|
.It Ic InUse
|
|
Number of memory allocations of the given type, for which
|
|
.Xr free 9
|
|
has not been called yet.
|
|
.It Ic MemUse
|
|
Total memory consumed by the given allocation type.
|
|
.It Ic Requests
|
|
Number of memory allocation requests for the given
|
|
memory type.
|
|
.El
|
|
.Pp
|
|
The same information can be gathered in userspace with
|
|
.Dq Nm vmstat Fl m .
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm map Ns Oo Li / Ns Cm f Oc Ar addr
|
|
Prints the VM map at
|
|
.Ar addr .
|
|
If the
|
|
.Cm f
|
|
modifier is specified the
|
|
complete map is printed.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm msgbuf
|
|
Print the system's message buffer.
|
|
It is the same output as in the
|
|
.Dq Nm dmesg
|
|
case.
|
|
It is useful if you got a kernel panic, attached a serial cable
|
|
to the machine and want to get the boot messages from before the
|
|
system hang.
|
|
.\"
|
|
.It Ic show Cm mount
|
|
Displays short info about all currently mounted file systems.
|
|
.Pp
|
|
.It Ic show Cm mount Ar addr
|
|
Displays details about the given mount point.
|
|
.Pp
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm object Ns Oo Li / Ns Cm f Oc Ar addr
|
|
Prints the VM object at
|
|
.Ar addr .
|
|
If the
|
|
.Cm f
|
|
option is specified the
|
|
complete object is printed.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm page
|
|
Show statistics on VM pages.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm pageq
|
|
Show statistics on VM page queues.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm pciregs
|
|
Print PCI bus registers.
|
|
The same information can be gathered in userspace by running
|
|
.Dq Nm pciconf Fl lv .
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm pcpu
|
|
Print current processor state.
|
|
The output format is as follows:
|
|
.Pp
|
|
.Bl -tag -compact -offset indent -width "spin locks held:"
|
|
.It Ic cpuid
|
|
Processor identifier.
|
|
.It Ic curthread
|
|
Thread pointer, process identifier and the name of the process.
|
|
.It Ic curpcb
|
|
Control block pointer.
|
|
.It Ic fpcurthread
|
|
FPU thread pointer.
|
|
.It Ic idlethread
|
|
Idle thread pointer.
|
|
.It Ic APIC ID
|
|
CPU identifier coming from APIC.
|
|
.It Ic currentldt
|
|
LDT pointer.
|
|
.It Ic spin locks held
|
|
Names of spin locks held.
|
|
.El
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm pgrpdump
|
|
Dump process groups present within the system.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm proc Op Ar addr
|
|
If no
|
|
.Op Ar addr
|
|
is specified, print information about the current process.
|
|
Otherwise, show information about the process at address
|
|
.Ar addr .
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm procvm
|
|
Show process virtual memory layout.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm protosw Ar addr
|
|
Print protocol switch structure
|
|
.Vt struct protosw
|
|
at address
|
|
.Ar addr .
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm registers Ns Op Li / Ns Cm u
|
|
Display the register set.
|
|
If the
|
|
.Cm u
|
|
modifier is specified, it displays user registers instead of
|
|
kernel registers or the currently saved one.
|
|
.Pp
|
|
.Sy Warning :
|
|
The support of the
|
|
.Cm u
|
|
modifier depends on the machine.
|
|
If not supported, incorrect information will be displayed.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm rman Ar addr
|
|
Show resource manager object
|
|
.Vt struct rman
|
|
at address
|
|
.Ar addr .
|
|
Addresses of particular pointers can be gathered with "show allrman"
|
|
command.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm rtc
|
|
Show real time clock value.
|
|
Useful for long debugging sessions.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm sleepchain
|
|
Show all the threads a particular thread is waiting on based on
|
|
sleepable locks.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm sleepq
|
|
.It Ic show Cm sleepqueue
|
|
Both commands provide the same functionality.
|
|
They show sleepqueue
|
|
.Vt struct sleepqueue
|
|
structure.
|
|
Sleepqueues are used within the
|
|
.Fx
|
|
kernel to implement sleepable
|
|
synchronization primitives (thread holding a lock might sleep or
|
|
be context switched), which at the time of writing are:
|
|
.Xr condvar 9 ,
|
|
.Xr sx 9
|
|
and standard
|
|
.Xr msleep 9
|
|
interface.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm sockbuf Ar addr
|
|
.It Ic show Cm socket Ar addr
|
|
Those commands print
|
|
.Vt struct sockbuf
|
|
and
|
|
.Vt struct socket
|
|
objects placed at
|
|
.Ar addr .
|
|
Output consists of all values present in structures mentioned.
|
|
For exact interpretation and more details, visit
|
|
.Pa sys/socket.h
|
|
header file.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm sysregs
|
|
Show system registers (e.g.,
|
|
.Li cr0-4
|
|
on i386.)
|
|
Not present on some platforms.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm tcpcb Ar addr
|
|
Print TCP control block
|
|
.Vt struct tcpcb
|
|
lying at address
|
|
.Ar addr .
|
|
For exact interpretation of output, visit
|
|
.Pa netinet/tcp.h
|
|
header file.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm thread Op Ar addr
|
|
If no
|
|
.Ar addr
|
|
is specified, show detailed information about current thread.
|
|
Otherwise, information about thread at
|
|
.Ar addr
|
|
is printed.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm threads
|
|
Show all threads within the system.
|
|
Output format is as follows:
|
|
.Pp
|
|
.Bl -tag -width "PPID" -compact -offset indent -width "Second column"
|
|
.It Ic First column
|
|
Thread identifier (TID)
|
|
.It Ic Second column
|
|
Thread structure address
|
|
.It Ic Third column
|
|
Backtrace.
|
|
.El
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm ttys
|
|
Show all TTY's within the system.
|
|
Output is similar to
|
|
.Xr pstat 8 .
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm turnstile Ar addr
|
|
Show turnstile
|
|
.Vt struct turnstile
|
|
structure at address
|
|
.Ar addr .
|
|
Turnstiles are structures used within the
|
|
.Fx
|
|
kernel to implement
|
|
synchronization primitives which, while holding a specific type of lock, cannot
|
|
sleep or context switch to another thread.
|
|
Currently, those are:
|
|
.Xr mutex 9 ,
|
|
.Xr rwlock 9 ,
|
|
.Xr rmlock 9 .
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm uma
|
|
Show UMA allocator statistics.
|
|
Output consists five columns:
|
|
.Pp
|
|
.Bl -tag -compact -offset indent -width "Requests"
|
|
.It Cm "Zone"
|
|
Name of the UMA zone.
|
|
The same string that was passed to
|
|
.Xr uma_zcreate 9
|
|
as a first argument.
|
|
.It Cm "Size"
|
|
Size of a given memory object (slab).
|
|
.It Cm "Used"
|
|
Number of slabs being currently used.
|
|
.It Cm "Free"
|
|
Number of free slabs within the UMA zone.
|
|
.It Cm "Requests"
|
|
Number of allocations requests to the given zone.
|
|
.El
|
|
.Pp
|
|
The very same information might be gathered in the userspace
|
|
with the help of
|
|
.Dq Nm vmstat Fl z
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm unpcb Ar addr
|
|
Shows UNIX domain socket private control block
|
|
.Vt struct unpcb
|
|
present at the address
|
|
.Ar addr
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm vmochk
|
|
Prints, whether the internal VM objects are in a map somewhere
|
|
and none have zero ref counts.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm vmopag
|
|
This is supposed to show physical addresses consumed by a
|
|
VM object.
|
|
Currently, it is not possible to use this command when
|
|
.Xr witness 9
|
|
is compiled in the kernel.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm vnode Op Ar addr
|
|
Prints vnode
|
|
.Vt struct vnode
|
|
structure lying at
|
|
.Op Ar addr .
|
|
For the exact interpretation of the output, look at the
|
|
.Pa sys/vnode.h
|
|
header file.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm watches
|
|
Displays all watchpoints.
|
|
Shows watchpoints set with "watch" command.
|
|
.\"
|
|
.Pp
|
|
.It Ic show Cm witness
|
|
Shows information about lock acquisition coming from the
|
|
.Xr witness 9
|
|
subsystem.
|
|
.\"
|
|
.Pp
|
|
.It Ic gdb
|
|
Toggles between remote GDB and DDB mode.
|
|
In remote GDB mode, another machine is required that runs
|
|
.Xr gdb 1
|
|
using the remote debug feature, with a connection to the serial
|
|
console port on the target machine.
|
|
Currently only available on the
|
|
i386
|
|
architecture.
|
|
.Pp
|
|
.It Ic halt
|
|
Halt the system.
|
|
.Pp
|
|
.It Ic kill Ar sig pid
|
|
Send signal
|
|
.Ar sig
|
|
to process
|
|
.Ar pid .
|
|
The signal is acted on upon returning from the debugger.
|
|
This command can be used to kill a process causing resource contention
|
|
in the case of a hung system.
|
|
See
|
|
.Xr signal 3
|
|
for a list of signals.
|
|
Note that the arguments are reversed relative to
|
|
.Xr kill 2 .
|
|
.Pp
|
|
.It Ic reboot
|
|
.It Ic reset
|
|
Hard reset the system.
|
|
.Pp
|
|
.It Ic help
|
|
Print a short summary of the available commands and command
|
|
abbreviations.
|
|
.Pp
|
|
.It Ic capture on
|
|
.It Ic capture off
|
|
.It Ic capture reset
|
|
.It Ic capture status
|
|
.Nm
|
|
supports a basic output capture facility, which can be used to retrieve the
|
|
results of debugging commands from userpsace using
|
|
.Xr sysctl 2 .
|
|
.Ic capture on
|
|
enables output capture;
|
|
.Ic capture off
|
|
disables capture.
|
|
.Ic capture reset
|
|
will clear the capture buffer and disable capture.
|
|
.Ic capture status
|
|
will report current buffer use, buffer size, and disposition of output
|
|
capture.
|
|
.Pp
|
|
Userspace processes may inspect and manage
|
|
.Nm
|
|
capture state using
|
|
.Xr sysctl 8 :
|
|
.Pp
|
|
.Dv debug.ddb.capture.bufsize
|
|
may be used to query or set the current capture buffer size.
|
|
.Pp
|
|
.Dv debug.ddb.capture.maxbufsize
|
|
may be used to query the compile-time limit on the capture buffer size.
|
|
.Pp
|
|
.Dv debug.ddb.capture.bytes
|
|
may be used to query the number of bytes of output currently in the capture
|
|
buffer.
|
|
.Pp
|
|
.Dv debug.ddb.capture.data
|
|
returns the contents of the buffer as a string to an appropriately privileged
|
|
process.
|
|
.Pp
|
|
This facility is particularly useful in concert with the scripting and
|
|
.Xr textdump 4
|
|
facilities, allowing scripted debugging output to be captured and
|
|
committed to disk as part of a textdump for later analysis.
|
|
The contents of the capture buffer may also be inspected in a kernel core dump
|
|
using
|
|
.Xr kgdb 1 .
|
|
.Pp
|
|
.It Ic run
|
|
.It Ic script
|
|
.It Ic scripts
|
|
.It Ic unscript
|
|
Run, define, list, and delete scripts.
|
|
See the
|
|
.Sx SCRIPTING
|
|
section for more information on the scripting facility.
|
|
.Pp
|
|
.It Ic textdump set
|
|
.It Ic textdump status
|
|
.It Ic textdump unset
|
|
The
|
|
.Ic textdump set
|
|
command may be used to force the next kernel core dump to be a textdump
|
|
rather than a traditional memory dump or minidump.
|
|
.Ic textdump status
|
|
reports whether a textdump has been scheduled.
|
|
.Ic textdump unset
|
|
cancels a request to perform a textdump as the next kernel core dump.
|
|
More information may be found in
|
|
.Xr textdump 4 .
|
|
.El
|
|
.Sh VARIABLES
|
|
The debugger accesses registers and variables as
|
|
.Li $ Ns Ar name .
|
|
Register names are as in the
|
|
.Dq Ic show Cm registers
|
|
command.
|
|
Some variables are suffixed with numbers, and may have some modifier
|
|
following a colon immediately after the variable name.
|
|
For example, register variables can have a
|
|
.Cm u
|
|
modifier to indicate user register (e.g.,
|
|
.Dq Li $eax:u ) .
|
|
.Pp
|
|
Built-in variables currently supported are:
|
|
.Pp
|
|
.Bl -tag -width ".Va tabstops" -compact
|
|
.It Va radix
|
|
Input and output radix.
|
|
.It Va maxoff
|
|
Addresses are printed as
|
|
.Dq Ar symbol Ns Li + Ns Ar offset
|
|
unless
|
|
.Ar offset
|
|
is greater than
|
|
.Va maxoff .
|
|
.It Va maxwidth
|
|
The width of the displayed line.
|
|
.It Va lines
|
|
The number of lines.
|
|
It is used by the built-in pager.
|
|
.It Va tabstops
|
|
Tab stop width.
|
|
.It Va work Ns Ar xx
|
|
Work variable;
|
|
.Ar xx
|
|
can take values from 0 to 31.
|
|
.El
|
|
.Sh EXPRESSIONS
|
|
Most expression operators in C are supported except
|
|
.Ql ~ ,
|
|
.Ql ^ ,
|
|
and unary
|
|
.Ql & .
|
|
Special rules in
|
|
.Nm
|
|
are:
|
|
.Bl -tag -width ".No Identifiers"
|
|
.It Identifiers
|
|
The name of a symbol is translated to the value of the symbol, which
|
|
is the address of the corresponding object.
|
|
.Ql \&.
|
|
and
|
|
.Ql \&:
|
|
can be used in the identifier.
|
|
If supported by an object format dependent routine,
|
|
.Sm off
|
|
.Oo Ar filename : Oc Ar func : lineno ,
|
|
.Sm on
|
|
.Oo Ar filename : Oc Ns Ar variable ,
|
|
and
|
|
.Oo Ar filename : Oc Ns Ar lineno
|
|
can be accepted as a symbol.
|
|
.It Numbers
|
|
Radix is determined by the first two letters:
|
|
.Ql 0x :
|
|
hex,
|
|
.Ql 0o :
|
|
octal,
|
|
.Ql 0t :
|
|
decimal; otherwise, follow current radix.
|
|
.It Li \&.
|
|
.Va dot
|
|
.It Li +
|
|
.Va next
|
|
.It Li ..
|
|
address of the start of the last line examined.
|
|
Unlike
|
|
.Va dot
|
|
or
|
|
.Va next ,
|
|
this is only changed by
|
|
.Ic examine
|
|
or
|
|
.Ic write
|
|
command.
|
|
.It Li '
|
|
last address explicitly specified.
|
|
.It Li $ Ns Ar variable
|
|
Translated to the value of the specified variable.
|
|
It may be followed by a
|
|
.Ql \&:
|
|
and modifiers as described above.
|
|
.It Ar a Ns Li # Ns Ar b
|
|
A binary operator which rounds up the left hand side to the next
|
|
multiple of right hand side.
|
|
.It Li * Ns Ar expr
|
|
Indirection.
|
|
It may be followed by a
|
|
.Ql \&:
|
|
and modifiers as described above.
|
|
.El
|
|
.Sh SCRIPTING
|
|
.Nm
|
|
supports a basic scripting facility to allow automating tasks or responses to
|
|
specific events.
|
|
Each script consists of a list of DDB commands to be executed sequentially,
|
|
and is assigned a unique name.
|
|
Certain script names have special meaning, and will be automatically run on
|
|
various
|
|
.Nm
|
|
events if scripts by those names have been defined.
|
|
.Pp
|
|
The
|
|
.Ic script
|
|
command may be used to define a script by name.
|
|
Scripts consist of a series of
|
|
.Nm
|
|
commands separated with the
|
|
.Ic ;
|
|
character.
|
|
For example:
|
|
.Bd -literal -offset indent
|
|
script kdb.enter.panic=bt; show pcpu
|
|
script lockinfo=show alllocks; show lockedvnods
|
|
.Ed
|
|
.Pp
|
|
The
|
|
.Ic scripts
|
|
command lists currently defined scripts.
|
|
.Pp
|
|
The
|
|
.Ic run
|
|
command execute a script by name.
|
|
For example:
|
|
.Bd -literal -offset indent
|
|
run lockinfo
|
|
.Ed
|
|
.Pp
|
|
The
|
|
.Ic unscript
|
|
command may be used to delete a script by name.
|
|
For example:
|
|
.Bd -literal -offset indent
|
|
unscript kdb.enter.panic
|
|
.Ed
|
|
.Pp
|
|
These functions may also be performed from userspace using the
|
|
.Xr ddb 8
|
|
command.
|
|
.Pp
|
|
Certain scripts are run automatically, if defined, for specific
|
|
.Nm
|
|
events.
|
|
The follow scripts are run when various events occur:
|
|
.Bl -tag -width kdb.enter.powerfail
|
|
.It Dv kdb.enter.acpi
|
|
The kernel debugger was entered as a result of an
|
|
.Xr acpi 4
|
|
event.
|
|
.It Dv kdb.enter.bootflags
|
|
The kernel debugger was entered at boot as a result of the debugger boot
|
|
flag being set.
|
|
.It Dv kdb.enter.break
|
|
The kernel debugger was entered as a result of a serial or console break.
|
|
.It Dv kdb.enter.cam
|
|
The kernel debugger was entered as a result of a
|
|
.Xr CAM 4
|
|
event.
|
|
.It Dv kdb.enter.mac
|
|
The kernel debugger was entered as a result of an assertion failure in the
|
|
.Xr mac_test 4
|
|
module of the
|
|
TrustedBSD MAC Framework.
|
|
.It Dv kdb.enter.ndis
|
|
The kernel debugger was entered as a result of an
|
|
.Xr ndis 4
|
|
breakpoint event.
|
|
.It Dv kdb.enter.netgraph
|
|
The kernel debugger was entered as a result of a
|
|
.Xr netgraph 4
|
|
event.
|
|
.It Dv kdb.enter.panic
|
|
.Xr panic 9
|
|
was called.
|
|
.It Dv kdb.enter.powerfail
|
|
The kernel debugger was entered as a result of a powerfail NMI on the sparc64
|
|
platform.
|
|
.It Dv kdb.enter.powerpc
|
|
The kernel debugger was entered as a result of an unimplemented interrupt
|
|
type on the powerpc platform.
|
|
.It Dv kdb.enter.sysctl
|
|
The kernel debugger was entered as a result of the
|
|
.Dv debug.kdb.enter
|
|
sysctl being set.
|
|
.It Dv kdb.enter.trapsig
|
|
The kernel debugger was entered as a result of a trapsig event on the sparc64
|
|
or sun4v platform.
|
|
.It Dv kdb.enter.unionfs
|
|
The kernel debugger was entered as a result of an assertion failure in the
|
|
union file system.
|
|
.It Dv kdb.enter.unknown
|
|
The kernel debugger was entered, but no reason has been set.
|
|
.It Dv kdb.enter.vfslock
|
|
The kernel debugger was entered as a result of a VFS lock violation.
|
|
.It Dv kdb.enter.watchdog
|
|
The kernel debugger was entered as a result of a watchdog firing.
|
|
.It Dv kdb.enter.witness
|
|
The kernel debugger was entered as a result of a
|
|
.Xr witness 4
|
|
violation.
|
|
.El
|
|
.Pp
|
|
In the event that none of these scripts is found,
|
|
.Nm
|
|
will attempt to execute a default script:
|
|
.Bl -tag -width kdb.enter.powerfail
|
|
.It Dv kdb.enter.default
|
|
The kernel debugger was entered, but a script exactly matching the reason for
|
|
entering was not defined.
|
|
This can be used as a catch-all to handle cases not specifically of interest;
|
|
for example,
|
|
.Dv kdb.enter.witness
|
|
might be defined to have special handling, and
|
|
.Dv kdb.enter.default
|
|
might be defined to simply panic and reboot.
|
|
.El
|
|
.Sh HINTS
|
|
On machines with an ISA expansion bus, a simple NMI generation card can be
|
|
constructed by connecting a push button between the A01 and B01 (CHCHK# and
|
|
GND) card fingers.
|
|
Momentarily shorting these two fingers together may cause the bridge chipset to
|
|
generate an NMI, which causes the kernel to pass control to
|
|
.Nm .
|
|
Some bridge chipsets do not generate a NMI on CHCHK#, so your mileage may vary.
|
|
The NMI allows one to break into the debugger on a wedged machine to
|
|
diagnose problems.
|
|
Other bus' bridge chipsets may be able to generate NMI using bus specific
|
|
methods.
|
|
.Sh FILES
|
|
Header files mention in this manual page can be found below
|
|
.Pa /usr/include
|
|
directory.
|
|
.Pp
|
|
.Bl -dash -compact
|
|
.It
|
|
.Pa sys/buf.h
|
|
.It
|
|
.Pa sys/domain.h
|
|
.It
|
|
.Pa netinet/in_pcb.h
|
|
.It
|
|
.Pa sys/socket.h
|
|
.It
|
|
.Pa sys/vnode.h
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr gdb 1 ,
|
|
.Xr kgdb 1 ,
|
|
.Xr acpi 4 ,
|
|
.Xr CAM 4 ,
|
|
.Xr mac_test 4 ,
|
|
.Xr ndis 4 ,
|
|
.Xr netgraph 4 ,
|
|
.Xr textdump 4 ,
|
|
.Xr witness 4 ,
|
|
.Xr ddb 8 ,
|
|
.Xr sysctl 8 ,
|
|
.Xr panic 9 ,
|
|
.Xr witness 9
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
debugger was developed for Mach, and ported to
|
|
.Bx 386 0.1 .
|
|
This manual page translated from
|
|
.Xr man 7
|
|
macros by
|
|
.An Garrett Wollman .
|
|
.Pp
|
|
.An Robert N. M. Watson
|
|
added support for
|
|
.Nm
|
|
output capture,
|
|
.Xr textdump 4
|
|
and scripting in
|
|
.Fx 7.1 .
|