157 lines
3.9 KiB
Groff
157 lines
3.9 KiB
Groff
.\" Copyright (c) 1999 Global Technology Associates, Inc.
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.\" 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 THE AUTHOR 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
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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.\" OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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.\" OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 2, 2016
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.Dt KGZIP 8
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.Os
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.Sh NAME
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.Nm kgzip
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.Nd compress a kernel
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.Sh SYNOPSIS
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.Nm
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.Op Fl cv
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.Op Fl f Ar format
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.Op Fl l Ar loader
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.Op Fl o Ar output
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.Ar file
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.Sh DESCRIPTION
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.Bf -symbolic
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This utility is deprecated.
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Users are advised to use
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.Xr loader 8
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and compress the kernel with
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.Xr gzip 1 .
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.Ef
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.Pp
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The
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.Nm
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utility compresses a kernel or some other bootable binary.
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Operation
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is in two phases as follows:
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.Bl -enum
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.It
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A load image of the executable file is built which omits all but
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the
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.Sq text
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and
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.Sq data
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segments.
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This image is compressed using
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.Xr gzip 1
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and output as data in relocatable object format.
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.It
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The object file is linked with a special self-hosting loader, producing
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an executable suitable for booting with either the second- or
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third-level bootstraps.
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.El
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.Pp
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Supported object formats are 32-bit ELF and a.out ZMAGIC.
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.Pp
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If the
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.Ar file
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operand has a
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.Sq .o
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suffix, input is assumed to be for the link phase, and the first phase
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is omitted.
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.Pp
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The options are:
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.Bl -tag -width Fl
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.It Fl c
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Omit the link phase.
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.It Fl v
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Display object file information.
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.It Fl f Ar format
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Use
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.Ar format
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as the output format, where
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.Ar format
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is
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.Sq aout
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or
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.Sq elf .
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The default format is ELF.
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.It Fl l Ar loader
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Link
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.Ar loader
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as the loader.
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.It Fl o Ar output
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Name the output file
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.Ar output .
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The default is to use the input name with the suffix
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.Sq .o
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(for relocatables) or
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.Sq .kgz
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(for executables).
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.El
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.Sh NOTES
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Global variables equivalent to the following are defined in the output:
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.Bd -literal
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struct kgz_hdr {
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char ident[4]; /* identification: "KGZ" */
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uint32_t dload; /* decoded image load address */
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uint32_t dsize; /* decoded image size */
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uint32_t isize; /* image size in memory */
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uint32_t entry; /* entry point */
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uint32_t nsize; /* encoded image size */
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} kgz;
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uint8_t kgz_ndata[]; /* encoded data */
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.Ed
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.Pp
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The encoded data is simply
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.Xr gzip 1
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output: a header (with no optional fields); compressed data; and 32-bit
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CRC and size values.
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.Sh FILES
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.Bl -tag -width /usr/lib/kgzldr.o -compact
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.It Pa /usr/lib/kgzldr.o
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The default loader
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.El
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.Sh EXIT STATUS
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.Ex -std
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.Sh SEE ALSO
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.Xr gzip 1 ,
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.Xr ld 1 ,
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.Xr a.out 5 ,
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.Xr elf 5 ,
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.Xr boot 8 ,
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.Xr loader 8
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.Sh AUTHORS
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.An Robert Nordier Aq Mt rnordier@FreeBSD.org
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.Sh BUGS
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As symbols are lost, the usefulness of this utility for compressing
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kernels is limited to situations where
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.Xr loader 8
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cannot be used.
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.Pp
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.Pa kgzldr.o
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is only available for the i386 architecture.
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.Pp
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The preferred method of compressing a kernel
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is simply to
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.Xr gzip 1
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it.
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