mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-25 11:37:56 +00:00
132 lines
3.7 KiB
Groff
132 lines
3.7 KiB
Groff
.\" 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 FreeBSD
|
|
.Sh NAME
|
|
.Nm kgzip
|
|
.Nd compress a kernel
|
|
.Sh SYNOPSIS
|
|
.Nm kgzip
|
|
.Op Fl cv
|
|
.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 input formats are ELF and a.out ZMAGIC; the output format
|
|
is always ELF. Only 32-bit objects are supported.
|
|
.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 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 SEE ALSO
|
|
.Xr gzip 1 ,
|
|
.Xr ld 1 ,
|
|
.Xr elf 5 ,
|
|
.Xr a.out 5 ,
|
|
.Xr boot 8 ,
|
|
.Xr loader 8
|
|
.Sh DIAGNOSTICS
|
|
Exit status is 0 on success and >0 on error.
|
|
.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.
|