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180 lines
4.6 KiB
Groff
180 lines
4.6 KiB
Groff
.\" Copyright (c) 2003 Greg Lehey. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" This software is provided by Greg Lehey ``as is'' and
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.\" any express or implied warranties, including, but not limited to, the
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.\" implied warranties of merchantability and fitness for a particular purpose
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.\" are disclaimed. in no event shall Greg Lehey be liable
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.\" for any direct, indirect, incidental, special, exemplary, or consequential
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.\" damages (including, but not limited to, procurement of substitute goods
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.\" or services; loss of use, data, or profits; or business interruption)
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.\" however caused and on any theory of liability, whether in contract, strict
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.\" liability, or tort (including negligence or otherwise) arising in any way
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.\" out of the use of this software, even if advised of the possibility of
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.\" such damage.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd December 20, 2006
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.Dt ASF 8
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.Os
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.Sh NAME
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.Nm asf
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.Nd add symbol files
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.Sh SYNOPSIS
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.Nm
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.Op Fl afKksVx
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.Op Fl M Ar core
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.Op Fl N Ar system
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.Op Fl o Ar outfile
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.Op Fl X Ar suffix
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.Op Ar modules-path Op Ar outfile
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.Sh DESCRIPTION
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By default,
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.Nm
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reads
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.Xr kldstat 8
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output from standard input and writes to the
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.Pa .asf
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file a list of
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.Xr gdb 1
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commands to add symbol files from KLDs in subdirectories of the subdirectory
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.Pa modules
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of the current directory, which is intended to be a kernel build directory.
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This allows
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.Xr gdb 1
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to load the symbols into the debugging environment.
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.Pp
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An optional
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.Ar modules-path
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argument can specify a semicolon-separated list of directory pathnames
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similar to the
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.Va kern.module_path
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sysctl.
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Each directory in the list will be searched in turn for modules.
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The default list consists of just one element,
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.Pa modules ,
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which is suitable if the current directory is a kernel build directory.
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.Pp
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If
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.Ar outfile
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is specified,
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.Nm
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writes to it instead of
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.Pa .asf .
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If
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.Ar outfile
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is a single dash
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.Pq Sq Fl ,
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standard output is used.
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.Sh OPTIONS
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The following options modify the function of
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.Nm :
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.Bl -tag -width indent
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.It Fl a
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When writing to an explicit
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.Ar outfile ,
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append to the file rather than overwriting it.
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.It Fl f
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Instead of trying to simplistically guess the path for each module, perform
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a traversal in the same way that
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.Xr find 1
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does to locate an exact path for each module, no matter where in
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.Ar modules-path
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it is located.
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.It Fl K
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Instead of reading from standard input, use the conventional
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system interface to get the list of modules currently loaded.
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.It Fl k
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Instead of reading from standard input, start a
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.Xr kldstat 8
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and read the information from it.
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.It Fl M
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Specify the core file for
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.Xr kvm 3 .
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Implies
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.Fl V .
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.It Fl N
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Specify the system file for
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.Xr kvm 3 .
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Implies
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.Fl V .
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.It Fl o
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Specify the file for
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.Nm
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to write or append its output to.
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If
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.Ar outfile
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is a single dash
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.Pq Sq Fl ,
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standard output is used.
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.It Fl s
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Do not prepend a (guessed) subdirectory of the module path.
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.It Fl V
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Instead of reading from standard input, use the
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.Xr kvm 3
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interface to get the list of modules.
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This interface allows for inspecting system crash dumps,
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as well as the live system.
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The
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.Fl M
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and
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.Fl N
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options will be of use if inspecting a crash dump.
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Elevated privileges, e.g., those of a superuser,
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may be needed to use this option.
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.It Fl X
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Add
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.Ar suffix
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to the list of suffixes
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.Nm
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tries to append to KLD file names.
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The default list consists of
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.Pa .debug ,
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.Pa .symbols ,
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and the null suffix.
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The null suffix always stays at the list tail, after the suffix added.
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Should it be needed in the middle of the list,
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a blank suffix can be specified to
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.Fl X
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instead.
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.It Fl x
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Clear the list of suffixes
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.Nm
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tries to append to KLD file names.
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Only the null suffix is left in the list.
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.El
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.Sh EXAMPLES
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To add symbol files from the system search path specified by the
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.Va kern.module_path
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sysctl, the following command can be used:
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.Pp
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.Dl asf -s `sysctl -n kern.module_path`
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.Sh SEE ALSO
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.Xr gdb 1 ,
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.Xr kvm 3 ,
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.Xr kld 4 ,
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.Xr kldstat 8 ,
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.Xr sysctl 8
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.Sh HISTORY
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The
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.Nm
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utility first appeared in
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.Fx 5.2 .
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.Sh AUTHORS
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.An Greg Lehey Aq Mt grog@FreeBSD.org
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.Sh BUGS
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Module paths are guessed in a rather naive way by default.
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It is likely to lag behind the changes to the build tree layout.
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Using
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.Fl f
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is recommended.
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