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/*
* Copyright (c) 1993 Terrence R. Lambert.
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Terrence R. Lambert.
* 4. The name Terrence R. Lambert may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``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 TERRENCE R. LAMBERT 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: modload.c,v 1.1 1994/08/19 12:07:14 davidg Exp $
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>
#include <a.out.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/conf.h>
#include <sys/mount.h>
#include <sys/lkm.h>
#include <sys/file.h>
#include <sys/errno.h>
#include "pathnames.h"
#ifndef DFLT_ENTRY
#define DFLT_ENTRY "xxxinit"
#endif /* !DFLT_ENTRY */
#define min(a, b) ((a) < (b) ? (a) : (b))
/*
* Expected linker options:
*
* -A executable to link against
* -e entry point
* -o output file
* -T address to link to in hex (assumes it's a page boundry)
* <target> object file
*/
#define LINKCMD "ld -A %s -e _%s -o %s -T %x %s"
int debug = 0;
int verbose = 0;
int
linkcmd(kernel, entry, outfile, address, object)
char *kernel, *entry, *outfile;
u_int address; /* XXX */
char *object;
{
char cmdbuf[1024];
int error = 0;
sprintf(cmdbuf, LINKCMD, kernel, entry, outfile, address, object);
if (debug)
printf("%s\n", cmdbuf);
switch (system(cmdbuf)) {
case 0: /* SUCCESS! */
break;
case 1: /* uninformitive error */
/*
* Someone needs to fix the return values from the FreeBSD
* ld program -- it's totally uninformative.
*
* No such file (4 on SunOS)
* Can't write output (2 on SunOS)
* Undefined symbol (1 on SunOS)
* etc.
*/
case 127: /* can't load shell */
case 32512:
default:
error = 1;
break;
}
return error;
}
void
usage()
{
fprintf(stderr, "usage:\n");
fprintf(stderr, "modload [-d] [-v] [-A <kernel>] [-e <entry]\n");
fprintf(stderr,
"[-p <postinstall>] [-o <output file>] <input file>\n");
exit(1);
}
int fileopen = 0;
#define DEV_OPEN 0x01
#define MOD_OPEN 0x02
#define PART_RESRV 0x04
int devfd, modfd;
struct lmc_resrv resrv;
void
cleanup()
{
if (fileopen & PART_RESRV) {
/*
* Free up kernel memory
*/
if (ioctl(devfd, LMUNRESRV, 0) == -1)
warn("can't release slot 0x%08x memory", resrv.slot);
}
if (fileopen & DEV_OPEN)
close(devfd);
if (fileopen & MOD_OPEN)
close(modfd);
}
int
main(argc, argv)
int argc;
char *argv[];
{
int c;
char *kname = _PATH_UNIX;
char *entry = DFLT_ENTRY;
char *post = NULL;
char *out = NULL;
char *modobj;
char modout[80], *p;
struct exec info_buf;
u_int modsize; /* XXX */
u_int modentry; /* XXX */
struct lmc_loadbuf ldbuf;
int sz, bytesleft;
char buf[MODIOBUF];
while ((c = getopt(argc, argv, "dvA:e:p:o:")) != EOF) {
switch (c) {
case 'd':
debug = 1;
break; /* debug */
case 'v':
verbose = 1;
break; /* verbose */
case 'A':
kname = optarg;
break; /* kernel */
case 'e':
entry = optarg;
break; /* entry point */
case 'p':
post = optarg;
break; /* postinstall */
case 'o':
out = optarg;
break; /* output file */
case '?':
usage();
default:
printf("default!\n");
break;
}
}
argc -= optind;
argv += optind;
if (argc != 1)
usage();
modobj = argv[0];
atexit(cleanup);
/*
* Open the virtual device device driver for exclusive use (needed
* to write the new module to it as our means of getting it in the
* kernel).
*/
if ((devfd = open(_PATH_LKM, O_RDWR, 0)) == -1)
err(3, _PATH_LKM);
fileopen |= DEV_OPEN;
strcpy(modout, modobj);
p = strchr(modout, '.');
if (!p || strcmp(p, ".o"))
errx(2, "module object must end in .o");
if (out == NULL) {
out = modout;
*p == 0;
}
/*
* Prelink to get file size
*/
if (linkcmd(kname, entry, out, 0, modobj))
errx(1, "can't prelink `%s' creating `%s'", modobj, out);
/*
* Pre-open the 0-linked module to get the size information
*/
if ((modfd = open(out, O_RDONLY, 0)) == -1)
err(4, out);
fileopen |= MOD_OPEN;
/*
* Get the load module post load size... do this by reading the
* header and doing page counts.
*/
if (read(modfd, &info_buf, sizeof(struct exec)) == -1)
err(3, "read `%s'", out);
/*
* Close the dummy module -- we have our sizing information.
*/
close(modfd);
fileopen &= ~MOD_OPEN;
/*
* Magic number...
*/
if (N_BADMAG(info_buf))
errx(4, "not an a.out format file");
/*
* Calculate the size of the module
*/
modsize = info_buf.a_text + info_buf.a_data + info_buf.a_bss;
/*
* Reserve the required amount of kernel memory -- this may fail
* to be successful.
*/
resrv.size = modsize; /* size in bytes */
resrv.name = modout; /* objname w/o ".o" */
resrv.slot = -1; /* returned */
resrv.addr = 0; /* returned */
if (ioctl(devfd, LMRESERV, &resrv) == -1)
err(9, "can't reserve memory");
fileopen |= PART_RESRV;
/*
* Relink at kernel load address
*/
if (linkcmd(kname, entry, out, resrv.addr, modobj))
errx(1, "can't link `%s' creating `%s' bound to 0x%08x",
modobj, out, resrv.addr);
/*
* Open the relinked module to load it...
*/
if ((modfd = open(out, O_RDONLY, 0)) == -1)
err(4, out);
fileopen |= MOD_OPEN;
/*
* Reread the header to get the actual entry point *after* the
* relink.
*/
if (read(modfd, &info_buf, sizeof(struct exec)) == -1)
err(3, "read `%s'", out);
/*
* Get the entry point (for initialization)
*/
modentry = info_buf.a_entry; /* place to call */
/*
* Seek to the text offset to start loading...
*/
if (lseek(modfd, N_TXTOFF(info_buf), 0) == -1)
err(12, "lseek");
/*
* Transfer the relinked module to kernel memory in chunks of
* MODIOBUF size at a time.
*/
for (bytesleft = info_buf.a_text + info_buf.a_data;
bytesleft > 0;
bytesleft -= sz) {
sz = min(bytesleft, MODIOBUF);
read(modfd, buf, sz);
ldbuf.cnt = sz;
ldbuf.data = buf;
if (ioctl(devfd, LMLOADBUF, &ldbuf) == -1)
err(11, "error transferring buffer");
}
/*
* Save ourselves before disaster (potentitally) strikes...
*/
sync();
/*
* Trigger the module as loaded by calling the entry procedure;
* this will do all necessary table fixup to ensure that state
* is maintained on success, or blow everything back to ground
* zero on failure.
*/
if (ioctl(devfd, LMREADY, &modentry) == -1)
err(14, "error initializing module");
/*
* Success!
*/
fileopen &= ~PART_RESRV; /* loaded */
printf("Module loaded as ID %d\n", resrv.slot);
return 0;
}
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