TH KTRACE 1
SH NAME
ktrace \- interpret kernel stack dumps
SH SYNOPSIS
B ktrace
[
B -i
]
I kernel
I pc
I sp
[
I link
]
SH DESCRIPTION
I Ktrace
translates a hexadecimal kernel stack dump
into a sequence of
IR acid (1)
commands to show the points in the call trace.
The
I kernel
argument should be the path of the kernel being debugged,
and
I pc
and
I sp
are the PC and SP values given in the stack dump.
For MIPS kernels, the contents of the
I link
register must also be supplied.
PP
A stack trace consists of a
I ktrace
command followed by a series of lines containing
fields of the form
IB location = contents \fR:
EX
ktrace /kernel/path 80105bc1 8048e174
8048e114=80105ac6 8048e120=80140bb4 8048e134=8010031c
8048e16c=80137e45 8048e170=80105bc1 8048e178=80137e62
\&...
EE
PP
The trace can be edited to provide the correct kernel path
and then pasted into a shell window.
If the
B -i
option is present,
I ktrace
instead prompts for the contents of the memory locations in which it is interested;
this is useful when the stack trace is on a screen rather than
in a machine readable form.
SH SOURCE
B /sys/src/cmd/ktrace.c
SH SEE ALSO
IR acid (1),
IR rdbfs (4)
SH BUGS
When examining a kernel trace resulting from
an interrupt on top of other interrupts,
only the topmost call trace is printed.

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