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-.\" Copyright (c) 1999 Global Technology Associates, Inc.
-.\" All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
-.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
-.\" OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
-.\" OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
-.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
-.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
-.\" OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
-.\" EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd July 19, 1999
-.Dt KGZIP 8
-.Os
-.Sh NAME
-.Nm kgzip
-.Nd compress a kernel
-.Sh SYNOPSIS
-.Nm
-.Op Fl cv
-.Op Fl f Ar format
-.Op Fl l Ar loader
-.Op Fl o Ar output
-.Ar file
-.Sh DESCRIPTION
-The
-.Nm
-utility compresses a kernel or some other bootable binary.
-Operation
-is in two phases as follows:
-.Bl -enum
-.It
-A load image of the executable file is built which omits all but
-the
-.Sq text
-and
-.Sq data
-segments.
-This image is compressed using
-.Xr gzip 1
-and output as data in relocatable object format.
-.It
-The object file is linked with a special self-hosting loader, producing
-an executable suitable for booting with either the second- or
-third-level bootstraps.
-.El
-.Pp
-Supported object formats are 32-bit ELF and a.out ZMAGIC.
-.Pp
-If the
-.Ar file
-operand has a
-.Sq .o
-suffix, input is assumed to be for the link phase, and the first phase
-is omitted.
-.Pp
-The options are:
-.Bl -tag -width Fl
-.It Fl c
-Omit the link phase.
-.It Fl v
-Display object file information.
-.It Fl f Ar format
-Use
-.Ar format
-as the output format, where
-.Ar format
-is
-.Sq aout
-or
-.Sq elf .
-The default format is ELF.
-.It Fl l Ar loader
-Link
-.Ar loader
-as the loader.
-.It Fl o Ar output
-Name the output file
-.Ar output .
-The default is to use the input name with the suffix
-.Sq .o
-(for relocatables) or
-.Sq .kgz
-(for executables).
-.El
-.Sh NOTES
-Global variables equivalent to the following are defined in the output:
-.Bd -literal
-struct kgz_hdr {
-    char	ident[4];	/* identification: "KGZ" */
-    uint32_t	dload;		/* decoded image load address */
-    uint32_t	dsize;		/* decoded image size */
-    uint32_t	isize;		/* image size in memory */
-    uint32_t	entry;		/* entry point */
-    uint32_t	nsize;		/* encoded image size */
-} kgz;
-
-uint8_t kgz_ndata[];		/* encoded data */
-.Ed
-.Pp
-The encoded data is simply
-.Xr gzip 1
-output: a header (with no optional fields); compressed data; and 32-bit
-CRC and size values.
-.Sh FILES
-.Bl -tag -width /usr/lib/kgzldr.o -compact
-.It Pa /usr/lib/kgzldr.o
-The default loader
-.El
-.Sh EXIT STATUS
-.Ex -std
-.Sh SEE ALSO
-.Xr gzip 1 ,
-.Xr ld 1 ,
-.Xr a.out 5 ,
-.Xr elf 5 ,
-.Xr boot 8 ,
-.Xr loader 8
-.Sh AUTHORS
-.An Robert Nordier Aq rnordier@FreeBSD.org .
-.Sh BUGS
-As symbols are lost, the usefulness of this utility for compressing
-kernels is limited to situations where
-.Xr loader 8
-cannot be used; otherwise the preferred method of compressing a kernel
-is simply to
-.Xr gzip 1
-it.