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83 lines
2.8 KiB
Groff
83 lines
2.8 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. 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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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS 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 May 22, 1995
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.Dt KERNBB 8
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.Os
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.Sh NAME
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.Nm kernbb
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.Nd generate a dump of the kernels basic-block profile buffers
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.Sh SYNOPSIS
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.Nm
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.Sh DESCRIPTION
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The
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.Nm
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utility is used to extract the basic-block profiling buffers of the running
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kernel into the files needed for the
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.Xr gcov 1
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tool.
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.Pp
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At least one source file in the running kernel must have been compiled
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with the
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.Fl Fl test-coverage
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and
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.Fl Fl profile-arcs
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options.
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.Pp
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The output is stored in the filenames compiled into the kernel by
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.Xr gcc 1 .
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If the absolute pathname cannot be written to, the directory part
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of the filename is discarded and the file stored in the current
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directory under its basename.
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.Pp
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The output files are named
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.Pa *.da ,
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and the
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.Xr gcov 1
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program will extract the counts and merge them with the source
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file to show actual execution counts.
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.Sh FILES
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.Bl -tag -width /boot/kernel/kernel -compact
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.It Pa /boot/kernel/kernel
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the default system
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.It Pa /dev/kmem
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the default memory
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.El
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.Sh SEE ALSO
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.Xr cc 1 ,
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.Xr gcov 1
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.Sh AUTHORS
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The
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.Nm
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utility was written by
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.An Poul-Henning Kamp ,
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along with the kernel-support.
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.Sh BUGS
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There are far too much magic and internal knowledge from GCC in this.
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