403 lines
9.2 KiB
C
403 lines
9.2 KiB
C
/*
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* Copyright (c) 1993 Terrence R. Lambert.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Terrence R. Lambert.
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* 4. The name Terrence R. Lambert may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: modload.c,v 1.13 1996/08/13 00:50:59 pst Exp $
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <errno.h>
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#include <err.h>
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#include <a.out.h>
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#include <sys/param.h>
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#include <sys/ioccom.h>
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#include <sys/conf.h>
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#include <sys/mount.h>
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#include <sys/lkm.h>
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#include <sys/file.h>
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#include <sys/wait.h>
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#include <sys/signal.h>
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#include "pathnames.h"
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#define min(a, b) ((a) < (b) ? (a) : (b))
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int debug = 0;
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int verbose = 0;
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int quiet = 0;
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int dounlink = 0;
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extern char *sys_siglist[];
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/*
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* Expected linker options:
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*
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* -A executable to link against
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* -e entry point
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* -o output file
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* -T address to link to in hex (assumes it's a page boundry)
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* <target> object file
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*/
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void
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linkcmd(kernel, entry, outfile, address, object)
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char *kernel, *entry, *outfile;
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u_int address; /* XXX */
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char *object;
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{
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char addrbuf[32], entrybuf[_POSIX2_LINE_MAX];
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pid_t pid;
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int status;
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snprintf(entrybuf, sizeof entrybuf, "_%s", entry);
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snprintf(addrbuf, sizeof addrbuf, "%x", address);
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if (debug)
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printf("%s -A %s -e %s -o %s -T %s %s\n",
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_PATH_LD, kernel, entrybuf, outfile,
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addrbuf, object);
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pid = fork();
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if(pid < 0) {
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err(18, "fork");
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}
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if(pid == 0) {
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execl(_PATH_LD, "ld", "-A", kernel, "-e", entrybuf, "-o",
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outfile, "-T", addrbuf, object, (char *)0);
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exit(128 + errno);
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}
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waitpid(pid, &status, 0);
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if(WIFSIGNALED(status)) {
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errx(1, "%s got signal: %s", _PATH_LD,
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sys_siglist[WTERMSIG(status)]);
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}
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if(WEXITSTATUS(status) > 128) {
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errno = WEXITSTATUS(status) - 128;
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err(1, "exec(%s)", _PATH_LD);
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}
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if(WEXITSTATUS(status) != 0) {
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errx(1, "%s: return code %d", _PATH_LD, WEXITSTATUS(status));
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}
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}
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void
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usage()
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{
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fprintf(stderr,
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"usage: modload [-d] [-v] [-q] [-u] [-A <kernel>] [-e <entry]\n");
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fprintf(stderr,
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" [-p <postinstall>] [-o <output file>] <input file>\n");
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exit(1);
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}
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int fileopen = 0;
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#define DEV_OPEN 0x01
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#define MOD_OPEN 0x02
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#define PART_RESRV 0x04
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int devfd, modfd;
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struct lmc_resrv resrv;
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void
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cleanup()
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{
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if (fileopen & PART_RESRV) {
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/*
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* Free up kernel memory
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*/
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if (ioctl(devfd, LMUNRESRV, 0) == -1)
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warn("can't release slot 0x%08x memory", resrv.slot);
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}
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if (fileopen & DEV_OPEN)
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close(devfd);
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if (fileopen & MOD_OPEN)
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close(modfd);
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}
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int c;
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char *kname = (char *)getbootfile();
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char *entry = NULL;
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char *post = NULL;
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char *out = NULL;
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char *modobj;
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char modout[80], *p;
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struct exec info_buf;
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u_int modsize; /* XXX */
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u_int modentry; /* XXX */
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struct lmc_loadbuf ldbuf;
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int sz, bytesleft;
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char buf[MODIOBUF];
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while ((c = getopt(argc, argv, "dvquA:e:p:o:")) != EOF) {
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switch (c) {
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case 'd':
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debug = 1;
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break; /* debug */
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case 'v':
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verbose = 1;
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break; /* verbose */
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case 'u':
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dounlink = 1;
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break;
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case 'q':
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quiet = 1;
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break;
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case 'A':
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kname = optarg;
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break; /* kernel */
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case 'e':
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entry = optarg;
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break; /* entry point */
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case 'p':
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post = optarg;
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break; /* postinstall */
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case 'o':
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out = optarg;
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break; /* output file */
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case '?':
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usage();
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default:
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printf("default!\n");
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break;
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}
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}
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argc -= optind;
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argv += optind;
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if (argc != 1)
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usage();
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modobj = argv[0];
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atexit(cleanup);
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/*
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* Open the virtual device device driver for exclusive use (needed
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* to write the new module to it as our means of getting it in the
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* kernel).
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*/
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if ((devfd = open(_PATH_LKM, O_RDWR, 0)) == -1)
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err(3, _PATH_LKM);
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fileopen |= DEV_OPEN;
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p = strrchr(modobj, '.');
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if (!p || strcmp(p, ".o"))
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errx(2, "module object must end in .o");
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if (!out) {
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p = strrchr(modobj, '/');
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if (p)
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p++; /* skip over '/' */
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else
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p = modobj;
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snprintf(modout, sizeof modout, "%s%sut", _PATH_TMP, p);
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out = modout;
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/*
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* reverse meaning of -u - if we've generated a /tmp
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* file, remove it automatically...
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*/
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dounlink = !dounlink;
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}
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if (!entry) { /* calculate default entry point */
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entry = strrchr(modobj, '/');
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if (entry)
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entry++; /* skip over '/' */
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else
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entry = modobj;
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entry = strdup(entry); /* so we can modify it */
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if (!entry)
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errx(1, "Could not allocate memory");
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entry[strlen(entry) - 2] = '\0'; /* chop off .o */
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}
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(void) unlink(out);
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modfd = open(out, O_RDWR | O_CREAT | O_EXCL, 0600);
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if(modfd < 0) {
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err(1, "creating %s", out);
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}
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close(modfd);
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/*
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* Prelink to get file size
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*/
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linkcmd(kname, entry, out, 0, modobj);
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/*
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* Pre-open the 0-linked module to get the size information
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*/
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if ((modfd = open(out, O_RDONLY, 0)) == -1)
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err(4, out);
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fileopen |= MOD_OPEN;
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/*
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* Get the load module post load size... do this by reading the
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* header and doing page counts.
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*/
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if (read(modfd, &info_buf, sizeof(struct exec)) == -1)
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err(3, "read `%s'", out);
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/*
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* Close the dummy module -- we have our sizing information.
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*/
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close(modfd);
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fileopen &= ~MOD_OPEN;
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/*
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* Magic number...
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*/
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if (N_BADMAG(info_buf))
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errx(4, "not an a.out format file");
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/*
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* Calculate the size of the module
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*/
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modsize = info_buf.a_text + info_buf.a_data + info_buf.a_bss;
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/*
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* Reserve the required amount of kernel memory -- this may fail
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* to be successful.
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*/
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resrv.size = modsize; /* size in bytes */
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resrv.name = modout; /* objname w/o ".o" */
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resrv.slot = -1; /* returned */
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resrv.addr = 0; /* returned */
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if (ioctl(devfd, LMRESERV, &resrv) == -1)
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err(9, "can't reserve memory");
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fileopen |= PART_RESRV;
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/*
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* Relink at kernel load address
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*/
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linkcmd(kname, entry, out, resrv.addr, modobj);
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/*
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* Open the relinked module to load it...
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*/
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if ((modfd = open(out, O_RDONLY, 0)) == -1)
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err(4, out);
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fileopen |= MOD_OPEN;
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/*
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* Reread the header to get the actual entry point *after* the
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* relink.
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*/
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if (read(modfd, &info_buf, sizeof(struct exec)) == -1)
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err(3, "read `%s'", out);
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/*
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* Get the entry point (for initialization)
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*/
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modentry = info_buf.a_entry; /* place to call */
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/*
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* Seek to the text offset to start loading...
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*/
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if (lseek(modfd, N_TXTOFF(info_buf), 0) == -1)
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err(12, "lseek");
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/*
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* Transfer the relinked module to kernel memory in chunks of
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* MODIOBUF size at a time.
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*/
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for (bytesleft = info_buf.a_text + info_buf.a_data;
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bytesleft > 0;
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bytesleft -= sz) {
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sz = min(bytesleft, MODIOBUF);
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read(modfd, buf, sz);
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ldbuf.cnt = sz;
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ldbuf.data = buf;
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if (ioctl(devfd, LMLOADBUF, &ldbuf) == -1)
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err(11, "error transferring buffer");
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}
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/*
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* Save ourselves before disaster (potentitally) strikes...
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*/
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sync();
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/*
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* Trigger the module as loaded by calling the entry procedure;
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* this will do all necessary table fixup to ensure that state
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* is maintained on success, or blow everything back to ground
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* zero on failure.
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*/
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if (ioctl(devfd, LMREADY, &modentry) == -1)
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err(14, "error initializing module");
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/*
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* Success!
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*/
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fileopen &= ~PART_RESRV; /* loaded */
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if(!quiet) printf("Module loaded as ID %d\n", resrv.slot);
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if (post) {
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struct lmc_stat sbuf;
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char id[16], type[16], offset[16];
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sbuf.id = resrv.slot;
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if (ioctl(devfd, LMSTAT, &sbuf) == -1)
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err(15, "error fetching module stats for post-install");
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sprintf(id, "%d", sbuf.id);
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sprintf(type, "0x%x", sbuf.type);
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sprintf(offset, "%d", sbuf.offset);
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/* XXX the modload docs say that drivers can install bdevsw &
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cdevsw, but the interface only supports one at a time. sigh. */
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execl(post, post, id, type, offset, 0);
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err(16, "can't exec '%s'", post);
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}
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if(dounlink) {
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if(unlink(out)) {
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err(17, "unlink(%s)", out);
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}
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}
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return 0;
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}
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