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kgzip is a kzip(8) replacement able to compress and link bootable

Browse Source 
32-bit binaries in both ELF and a.out format.

Development sponsored by Global Technology Associates, Inc.

Reviewed/tested by: abial
This commit is contained in:
Robert Nordier 1999-07-19 18:00:18 +00:00
parent a2dca20711
commit 4566a1d1d3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/cvs2svn/branches/RNORDIER/; revision=48905
10 changed files with 1066 additions and 0 deletions
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12
usr.sbin/kgzip/Makefile Normal file
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# $Id: $
PROG= kgzip
SRCS= kgzip.c elfhdr.c kgzcmp.c kgzld.c xio.c
MAN8= kgzip.8
CFLAGS+=-pedantic \
-W -Wall -Waggregate-return -Wbad-function-cast -Wcast-align \
-Wmissing-declarations -Wmissing-prototypes -Wnested-externs \
-Wpointer-arith -Wredundant-decls -Wshadow -Wstrict-prototypes \
-Wwrite-strings
.include <bsd.prog.mk>

163
usr.sbin/kgzip/elfhdr.c Normal file
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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.
*
* $Id:$
*/
#include <stddef.h>
#include "elfhdr.h"
#define KGZ_FIX_NSIZE 0 /* Run-time fixup */
/*
* Relocatable header template.
*/
const struct kgz_elfhdr elfhdr = {
/* ELF header */
{
{
ELFMAG0, ELFMAG1, ELFMAG2, ELFMAG3, /* e_ident */
ELFCLASS32, ELFDATA2LSB, EV_CURRENT, 0,
'F', 'r', 'e', 'e', 'B', 'S', 'D', 0
},
ET_EXEC, /* e_type */
EM_386, /* e_machine */
EV_CURRENT, /* e_version */
0, /* e_entry */
0, /* e_phoff */
offsetof(struct kgz_elfhdr, sh), /* e_shoff */
0, /* e_flags */
sizeof(Elf32_Ehdr), /* e_ehsize */
0, /* e_phentsize */
0, /* e_phnum */
sizeof(Elf32_Shdr), /* e_shentsize */
KGZ_SHNUM, /* e_shnum */
KGZ_SH_SHSTRTAB /* e_shstrndx */
},
/* Section header */
{
{
0, /* sh_name */
SHT_NULL, /* sh_type */
0, /* sh_flags */
0, /* sh_addr */
0, /* sh_offset */
0, /* sh_size */
SHN_UNDEF, /* sh_link */
0, /* sh_info */
0, /* sh_addralign */
0 /* sh_entsize */
},
{
offsetof(struct kgz_shstrtab, symtab), /* sh_name */
SHT_SYMTAB, /* sh_type */
0, /* sh_flags */
0, /* sh_addr */
offsetof(struct kgz_elfhdr, st), /* sh_offset */
sizeof(Elf32_Sym) * KGZ_STNUM, /* sh_size */
KGZ_SH_STRTAB, /* sh_link */
1, /* sh_info */
4, /* sh_addralign */
sizeof(Elf32_Sym) /* sh_entsize */
},
{
offsetof(struct kgz_shstrtab, shstrtab), /* sh_name */
SHT_STRTAB, /* sh_type */
0, /* sh_flags */
0, /* sh_addr */
offsetof(struct kgz_elfhdr, shstrtab), /* sh_offset */
sizeof(struct kgz_shstrtab), /* sh_size */
SHN_UNDEF, /* sh_link */
0, /* sh_info */
1, /* sh_addralign */
0 /* sh_entsize */
},
{
offsetof(struct kgz_shstrtab, strtab), /* sh_name */
SHT_STRTAB, /* sh_type */
0, /* sh_flags */
0, /* sh_addr */
offsetof(struct kgz_elfhdr, strtab), /* sh_offset */
sizeof(struct kgz_strtab), /* sh_size */
SHN_UNDEF, /* sh_link */
0, /* sh_info */
1, /* sh_addralign */
0 /* sh_entsize */
},
{
offsetof(struct kgz_shstrtab, data), /* sh_name */
SHT_PROGBITS, /* sh_type */
SHF_ALLOC | SHF_WRITE, /* sh_flags */
0, /* sh_addr */
sizeof(struct kgz_elfhdr), /* sh_offset */
sizeof(struct kgz_hdr) + KGZ_FIX_NSIZE, /* sh_size */
SHN_UNDEF, /* sh_link */
0, /* sh_info */
4, /* sh_addralign */
0 /* sh_entsize */
}
},
/* Symbol table */
{
{
0, /* st_name */
0, /* st_value */
0, /* st_size */
0, /* st_info */
0, /* st_other */
SHN_UNDEF /* st_shndx */
},
{
offsetof(struct kgz_strtab, kgz), /* st_name */
0, /* st_value */
sizeof(struct kgz_hdr), /* st_size */
ELF32_ST_INFO(STB_GLOBAL, STT_OBJECT), /* st_info */
0, /* st_other */
KGZ_SH_DATA /* st_shndx */
},
{
offsetof(struct kgz_strtab, kgz_ndata), /* st_name */
sizeof(struct kgz_hdr), /* st_value */
KGZ_FIX_NSIZE, /* st_size */
ELF32_ST_INFO(STB_GLOBAL, STT_OBJECT), /* st_info */
0, /* st_other */
KGZ_SH_DATA /* st_shndx */
}
},
/* Section header string table */
{
KGZ_SHSTR_ZERO, /* zero */
KGZ_SHSTR_SYMTAB, /* symtab */
KGZ_SHSTR_SHSTRTAB, /* shstrtab */
KGZ_SHSTR_STRTAB, /* strtab */
KGZ_SHSTR_DATA /* data */
},
/* String table */
{
KGZ_STR_ZERO, /* zero */
KGZ_STR_KGZ, /* kgz */
KGZ_STR_KGZ_NDATA /* kgz_ndata */
}
};

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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.
*
* $Id:$
*/
#include <elf.h>
#include "kgz.h"
/* Section header indices */
#define KGZ_SH_SYMTAB 1
#define KGZ_SH_SHSTRTAB 2
#define KGZ_SH_STRTAB 3
#define KGZ_SH_DATA 4
#define KGZ_SHNUM 5
/* Section header strings */
#define KGZ_SHSTR_ZERO ""
#define KGZ_SHSTR_SYMTAB ".symtab"
#define KGZ_SHSTR_SHSTRTAB ".shstrtab"
#define KGZ_SHSTR_STRTAB ".strtab"
#define KGZ_SHSTR_DATA ".data"
/* Section header string table */
struct kgz_shstrtab {
char zero[sizeof(KGZ_SHSTR_ZERO)];
char symtab[sizeof(KGZ_SHSTR_SYMTAB)];
char shstrtab[sizeof(KGZ_SHSTR_SHSTRTAB)];
char strtab[sizeof(KGZ_SHSTR_STRTAB)];
char data[sizeof(KGZ_SHSTR_DATA)];
};
/* Symbol table indices */
#define KGZ_ST_KGZ 1
#define KGZ_ST_KGZ_NDATA 2
#define KGZ_STNUM 3
/* Symbol table strings */
#define KGZ_STR_ZERO ""
#define KGZ_STR_KGZ "kgz"
#define KGZ_STR_KGZ_NDATA "kgz_ndata"
/* String table */
struct kgz_strtab {
char zero[sizeof(KGZ_STR_ZERO)];
char kgz[sizeof(KGZ_STR_KGZ)];
char kgz_ndata[sizeof(KGZ_STR_KGZ_NDATA)];
};
/* Relocatable header format */
struct kgz_elfhdr {
Elf32_Ehdr e;
Elf32_Shdr sh[KGZ_SHNUM];
Elf32_Sym st[KGZ_STNUM];
struct kgz_shstrtab shstrtab;
struct kgz_strtab strtab;
};
extern const struct kgz_elfhdr elfhdr;

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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.
*
* $Id:$
*/
#ifndef _KGZ_H_
#define _KGZ_H_
#include <sys/types.h>
/*
* KGZ definitions: kgzip(8) output.
*/
/* Values for ident[]. */
#define KGZ_ID0 'K'
#define KGZ_ID1 'G'
#define KGZ_ID2 'Z'
#define KGZ_ID3 '\0'
/* KGZ header. */
struct kgz_hdr {
char ident[4]; /* identification */
uint32_t dload; /* decoded image load address */
uint32_t dsize; /* decoded image size */
uint32_t isize; /* image size in memory */
uint32_t entry; /* program entry point */
uint32_t nsize; /* encoded image size */
};
extern struct kgz_hdr kgz; /* header */
extern uint8_t kgz_ndata[]; /* encoded image */
#endif /* !_KGZ_H_ */

215
usr.sbin/kgzip/kgzcmp.c Normal file
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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.
*
* $Id:$
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <a.out.h>
#include <elf.h>
#include "elfhdr.h"
#include "kgzip.h"
#define KGZOFF (sizeof(struct kgz_elfhdr) + sizeof(struct kgz_hdr))
#define F_AOUT 1 /* Input format: a.out */
#define F_ELF 2 /* Input format: ELF32 */
static void mk_data(const struct iodesc *i, const struct iodesc *,
struct kgz_hdr *);
static int ld_elf(const struct iodesc *, const struct iodesc *,
struct kgz_hdr *, const Elf32_Ehdr *);
static int ld_aout(const struct iodesc *, const struct iodesc *,
struct kgz_hdr *, const struct exec *);
/*
* Compress executable and output it in relocatable object format.
*/
void
kgzcmp(struct kgz_hdr *kh, const char *f1, const char *f2)
{
struct iodesc idi, ido;
struct kgz_elfhdr ehdr;
if ((idi.fd = open(idi.fname = f1, O_RDONLY)) == -1)
err(1, "%s", idi.fname);
if ((ido.fd = open(ido.fname = f2, O_CREAT | O_TRUNC | O_WRONLY,
0666)) == -1)
err(1, "%s", ido.fname);
kh->ident[0] = KGZ_ID0;
kh->ident[1] = KGZ_ID1;
kh->ident[2] = KGZ_ID2;
kh->ident[3] = KGZ_ID3;
xseek(&ido, KGZOFF);
mk_data(&idi, &ido, kh);
kh->dload &= 0xffffff;
kh->entry &= 0xffffff;
xseek(&ido, 0);
ehdr = elfhdr;
ehdr.st[KGZ_ST_KGZ_NDATA].st_size = kh->nsize;
ehdr.sh[KGZ_SH_DATA].sh_size += kh->nsize;
xwrite(&ido, &ehdr, sizeof(ehdr));
xwrite(&ido, kh, sizeof(*kh));
xclose(&ido);
xclose(&idi);
}
/*
* Make encoded (compressed) data.
*/
static void
mk_data(const struct iodesc * idi, const struct iodesc * ido,
struct kgz_hdr * kh)
{
union {
struct exec ex;
Elf32_Ehdr ee;
} hdr;
struct stat sb;
struct iodesc idp;
int fd[2];
pid_t pid;
size_t n;
int fmt, status, e;
n = xread(idi, &hdr, sizeof(hdr), 0);
fmt = 0;
if (n >= sizeof(hdr.ee) && IS_ELF(hdr.ee))
fmt = F_ELF;
else if (n >= sizeof(hdr.ex) && N_GETMAGIC(hdr.ex) == ZMAGIC)
fmt = F_AOUT;
if (!fmt)
errx(1, "%s: Format not supported", idi->fname);
if (pipe(fd))
err(1, NULL);
switch (pid = fork()) {
case -1:
err(1, NULL);
case 0:
close(fd[1]);
dup2(fd[0], STDIN_FILENO);
close(fd[0]);
close(idi->fd);
dup2(ido->fd, STDOUT_FILENO);
close(ido->fd);
execlp("gzip", "gzip", "-9", NULL);
warn(NULL);
_exit(1);
default:
close(fd[0]);
idp.fname = "(pipe)";
idp.fd = fd[1];
e = fmt == F_ELF ? ld_elf(idi, &idp, kh, &hdr.ee) :
fmt == F_AOUT ? ld_aout(idi, &idp, kh, &hdr.ex) : -1;
close(fd[1]);
if ((pid = waitpid(pid, &status, 0)) == -1)
err(1, NULL);
if (WIFSIGNALED(status) || WEXITSTATUS(status))
exit(1);
}
if (e)
errx(1, "%s: Invalid format", idi->fname);
if (fstat(ido->fd, &sb))
err(1, ido->fname);
kh->nsize = sb.st_size - KGZOFF;
}
/*
* "Load" an ELF-format executable.
*/
static int
ld_elf(const struct iodesc * idi, const struct iodesc * ido,
struct kgz_hdr * kh, const Elf32_Ehdr * e)
{
Elf32_Phdr p;
size_t load, addr, n;
unsigned x, i;
load = addr = n = 0;
for (x = i = 0; i < e->e_phnum; i++) {
if (xread(idi, &p, sizeof(p),
e->e_phoff + i * e->e_phentsize) != e->e_phentsize)
return -1;
if (p.p_type != PT_LOAD)
continue;
if (!x)
load = addr = p.p_vaddr;
else {
if (p.p_vaddr < addr)
return -1;
n = p.p_vaddr - addr;
if (n) {
xzero(ido, n);
addr += n;
}
}
if (p.p_memsz < p.p_filesz)
return -1;
n = p.p_memsz - p.p_filesz;
xcopy(idi, ido, p.p_filesz, p.p_offset);
addr += p.p_filesz;
x++;
}
if (!x)
return -1;
kh->dload = load;
kh->dsize = addr - load;
kh->isize = kh->dsize + n;
kh->entry = e->e_entry;
return 0;
}
/*
* "Load" an a.out-format executable.
*/
static int
ld_aout(const struct iodesc * idi, const struct iodesc * ido,
struct kgz_hdr * kh, const struct exec * a)
{
size_t load, addr;
load = addr = N_TXTADDR(*a);
xcopy(idi, ido, a->a_text, N_TXTOFF(*a));
addr += a->a_text;
if (N_DATADDR(*a) != addr)
return -1;
xcopy(idi, ido, a->a_data, N_DATOFF(*a));
addr += a->a_data;
kh->dload = load;
kh->dsize = addr - load;
kh->isize = kh->dsize + a->a_bss;
kh->entry = a->a_entry;
return 0;
}

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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.
.\"
.\" $Id:$
.\"
.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 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.

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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.
*/
#ifndef lint
static const char rcsid[] =
"$Id:$";
#endif /* not lint */
#include <sys/types.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "kgzip.h"
#define FN_SRC 0 /* Filename: source */
#define FN_OBJ 1 /* Filename: relocatable */
#define FN_KGZ 2 /* Filename: executable */
#define FN_CNT 3 /* Number of filenames */
#define SFX_OBJ ".o" /* Filename suffix: relocatable */
#define SFX_KGZ ".kgz" /* Filename suffix: executable */
#define SFX_MAX 5 /* Size of larger filename suffix */
#define TMP_PREFIX "kgz" /* Temporary file prefix */
const char *loader = "/usr/lib/kgzldr.o"; /* Default loader */
static const char *tname; /* Name of temporary file */
static void cleanup(void);
static void mk_fn(int, const char *, const char *, char *[]);
static void usage(void);
/*
* Compress a kernel.
*/
int
main(int argc, char *argv[])
{
static char *fn[FN_CNT];
struct kgz_hdr kh;
const char *output;
int cflag, vflag, c;
output = NULL;
cflag = vflag = 0;
while ((c = getopt(argc, argv, "cvl:o:")) != -1)
switch (c) {
case 'c':
cflag = 1;
break;
case 'v':
vflag = 1;
break;
case 'l':
loader = optarg;
break;
case 'o':
output = optarg;
break;
default:
usage();
}
argc -= optind;
argv += optind;
if (argc != 1)
usage();
atexit(cleanup);
mk_fn(cflag, *argv, output, fn);
memset(&kh, 0, sizeof(kh));
if (fn[FN_SRC])
kgzcmp(&kh, fn[FN_SRC], fn[FN_OBJ]);
if (!cflag)
kgzld(&kh, fn[FN_OBJ], fn[FN_KGZ]);
if (vflag)
printf("dload=%#x dsize=%#x isize=%#x entry=%#x nsize=%#x\n",
kh.dload, kh.dsize, kh.isize, kh.entry, kh.nsize);
return 0;
}
/*
* Clean up after processing.
*/
static void
cleanup(void)
{
if (tname)
unlink(tname);
}
/*
* Make the required filenames.
*/
static void
mk_fn(int cflag, const char *f1, const char *f2, char *fn[])
{
const char *p, *s;
size_t n;
int i;
i = 0;
s = strrchr(f1, 0);
n = sizeof(SFX_OBJ) - 1;
if ((size_t)(s - f1) > n && !memcmp(s - n, SFX_OBJ, n)) {
s -= n;
i++;
}
fn[i++] = (char *)f1;
if (i == FN_OBJ && !cflag) {
if (!(tname = tempnam(NULL, TMP_PREFIX)))
err(1, NULL);
fn[i++] = (char *)tname;
}
if (!(fn[i] = (char *)f2)) {
p = (p = strrchr(f1, '/')) ? p + 1 : f1;
n = (size_t)(s - p);
if (!(fn[i] = malloc(n + SFX_MAX)))
err(1, NULL);
memcpy(fn[i], p, n);
strcpy(fn[i] + n, i == FN_OBJ ? SFX_OBJ : SFX_KGZ);
}
}
/*
* Display usage information.
*/
static void
usage(void)
{
fprintf(stderr,
"usage: kgzip [-cv] [-l file] [-o filename] file\n");
exit(1);
}

47
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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.
*
* $Id:$
*/
#include "kgz.h"
/* Used by I/O routines */
struct iodesc {
const char *fname; /* File name */
int fd; /* File descriptor */
};
extern const char *loader; /* Default loader */
void kgzcmp(struct kgz_hdr *, const char *, const char *);
void kgzld(struct kgz_hdr *, const char *, const char *);
void xclose(const struct iodesc *);
void xcopy(const struct iodesc *, const struct iodesc *, size_t, off_t);
void xzero(const struct iodesc *, size_t);
size_t xread(const struct iodesc *, void *, size_t, off_t);
void xwrite(const struct iodesc *, const void *, size_t);
void xseek(const struct iodesc *, off_t);

80
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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.
*
* $Id:$
*/
#include <sys/types.h>
#include <sys/wait.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "elfhdr.h"
#include "kgzip.h"
#define KGZOFF sizeof(struct kgz_elfhdr)
#define align(x, y) (((x) + (y) - 1) & ~((y) - 1))
/*
* Link KGZ file and loader.
*/
void
kgzld(struct kgz_hdr * kh, const char *f1, const char *f2)
{
char addr[16];
struct iodesc idi;
pid_t pid;
size_t n;
int status;
if (strcmp(kh->ident, "KGZ")) {
if ((idi.fd = open(idi.fname = f1, O_RDONLY)) == -1)
err(1, "%s", idi.fname);
n = xread(&idi, kh, sizeof(*kh), KGZOFF);
xclose(&idi);
if (n != sizeof(*kh) || strcmp(kh->ident, "KGZ"))
errx(1, "%s: Invalid format", idi.fname);
}
sprintf(addr, "%#x", align(kh->dload + kh->dsize, 0x1000));
switch (pid = fork()) {
case -1:
err(1, NULL);
case 0:
execlp("ld", "ld", "-Ttext", addr, "-o", f2, loader, f1, NULL);
warn(NULL);
_exit(1);
default:
if ((pid = waitpid(pid, &status, 0)) == -1)
err(1, NULL);
if (WIFSIGNALED(status) || WEXITSTATUS(status))
exit(1);
}
}

122
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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.
*
* $Id:$
*/
#include <err.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include "kgzip.h"
/*
* Close a file.
*/
void
xclose(const struct iodesc *id)
{
if (close(id->fd))
err(1, "%s", id->fname);
}
/*
* Copy bytes from one file to another.
*/
void
xcopy(const struct iodesc * idi, const struct iodesc * ido,
size_t nbyte, off_t offset)
{
char buf[8192];
size_t n;
while (nbyte) {
if ((n = sizeof(buf)) > nbyte)
n = nbyte;
if (xread(idi, buf, n, offset) != n)
errx(1, "%s: Short read", idi->fname);
xwrite(ido, buf, n);
nbyte -= n;
offset = -1;
}
}
/*
* Write binary zeroes to a file.
*/
void
xzero(const struct iodesc * id, size_t nbyte)
{
char buf[8192];
size_t n;
memset(buf, 0, sizeof(buf));
while (nbyte) {
if ((n = sizeof(buf)) > nbyte)
n = nbyte;
xwrite(id, buf, n);
nbyte -= n;
}
}
/*
* Read from a file.
*/
size_t
xread(const struct iodesc * id, void *buf, size_t nbyte, off_t offset)
{
ssize_t n;
if (offset != -1 && lseek(id->fd, offset, SEEK_SET) != offset)
err(1, "%s", id->fname);
if ((n = read(id->fd, buf, nbyte)) == -1)
err(1, "%s", id->fname);
return (size_t)n;
}
/*
* Write to a file.
*/
void
xwrite(const struct iodesc * id, const void *buf, size_t nbyte)
{
ssize_t n;
if ((n = write(id->fd, buf, nbyte)) == -1)
err(1, "%s", id->fname);
if ((size_t)n != nbyte)
errx(1, "%s: Short write", id->fname);
}
/*
* Reposition within a file.
*/
void
xseek(const struct iodesc *id, off_t offset)
{
if (lseek(id->fd, offset, SEEK_SET) != offset)
err(1, "%s", id->fname);
}