e24168e6c3
* Fix a raft of warnings, printf and otherwise. * Allocate the correct amount in mod_searchmodule to prevent an overflow. * Fix the makefiles so they work outside my home directory (oops).
575 lines
14 KiB
C
575 lines
14 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY 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 AUTHOR OR CONTRIBUTORS 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: module.c,v 1.4 1998/09/14 18:27:04 msmith Exp $
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*/
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/*
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* module function dispatcher, support, etc.
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*/
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#include <stand.h>
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#include <string.h>
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#include "bootstrap.h"
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static struct loaded_module *mod_loadmodule(char *name, int argc, char *argv[]);
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static char *mod_searchdep(struct loaded_module *mp);
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static char *mod_searchfile(char *name);
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static char *mod_searchmodule(char *name);
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static void mod_append(struct loaded_module *mp);
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/* load address should be tweaked by first module loaded (kernel) */
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static vm_offset_t loadaddr = 0;
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static char *default_searchpath ="/;/boot";
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struct loaded_module *loaded_modules = NULL;
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/*
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* load an object, either a disk file or code module.
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*
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* To load a file, the syntax is:
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*
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* load -t <type> <path>
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*
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* code modules are loaded as:
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*
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* load <path> <options>
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*/
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COMMAND_SET(load, "load", "load a kernel or module", command_load);
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static int
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command_load(int argc, char *argv[])
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{
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char *typestr;
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int dofile, ch;
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dofile = 0;
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optind = 1;
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typestr = NULL;
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while ((ch = getopt(argc, argv, "t:")) != -1) {
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switch(ch) {
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case 't':
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typestr = optarg;
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dofile = 1;
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break;
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case '?':
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default:
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/* getopt has already reported an error */
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return(CMD_OK);
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}
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}
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argv += (optind - 1);
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argc -= (optind - 1);
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/*
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* Request to load a raw file?
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*/
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if (dofile) {
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if ((typestr == NULL) || (*typestr == 0)) {
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command_errmsg = "invalid load type";
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return(CMD_ERROR);
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}
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return(mod_loadobj(typestr, argv[1]));
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}
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/*
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* Looks like a request for a module.
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*/
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return(mod_load(argv[1], argc - 2, argv + 2));
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}
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COMMAND_SET(unload, "unload", "unload all modules", command_unload);
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static int
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command_unload(int argc, char *argv[])
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{
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struct loaded_module *mp;
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while (loaded_modules != NULL) {
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mp = loaded_modules;
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loaded_modules = loaded_modules->m_next;
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mod_discard(mp);
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}
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loadaddr = 0;
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return(CMD_OK);
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}
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COMMAND_SET(lsmod, "lsmod", "list loaded modules", command_lsmod);
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static int
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command_lsmod(int argc, char *argv[])
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{
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struct loaded_module *am;
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struct module_metadata *md;
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char lbuf[80];
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int ch, verbose;
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verbose = 0;
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optind = 1;
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while ((ch = getopt(argc, argv, "v")) != -1) {
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switch(ch) {
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case 'v':
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verbose = 1;
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break;
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case '?':
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default:
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/* getopt has already reported an error */
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return(CMD_OK);
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}
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}
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pager_open();
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for (am = loaded_modules; (am != NULL); am = am->m_next) {
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sprintf(lbuf, " %p: %s (%s, 0x%lx)\n",
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(void *) am->m_addr, am->m_name, am->m_type, (long) am->m_size);
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pager_output(lbuf);
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if (am->m_args != NULL) {
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pager_output(" args: ");
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pager_output(am->m_args);
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pager_output("\n");
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}
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if (verbose)
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/* XXX could add some formatting smarts here to display some better */
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for (md = am->m_metadata; md != NULL; md = md->md_next) {
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sprintf(lbuf, " 0x%04x, 0x%lx\n", md->md_type, (long) md->md_size);
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pager_output(lbuf);
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}
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}
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pager_close();
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return(CMD_OK);
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}
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/*
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* We've been asked to load (name) and give it (argc),(argv).
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* Start by trying to load it, and then attempt to load all of its
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* dependancies. If we fail at any point, throw them all away and
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* fail the entire load.
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*
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* XXX if a depended-on module requires arguments, it must be loaded
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* explicitly first.
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*/
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int
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mod_load(char *name, int argc, char *argv[])
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{
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struct loaded_module *last_mod, *base_mod, *mp;
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char *dep_name;
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/* remember previous last module on chain */
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for (last_mod = loaded_modules;
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(last_mod != NULL) && (last_mod->m_next != NULL);
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last_mod = last_mod->m_next)
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;
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/*
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* Load the first module; note that it's the only one that gets
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* arguments explicitly.
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*/
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if ((base_mod = mod_loadmodule(name, argc, argv)) == NULL)
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return(CMD_ERROR);
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/*
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* Look for dependancies.
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*/
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while ((dep_name = mod_searchdep(base_mod)) != NULL) {
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printf("loading required module '%s'\n", dep_name);
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if ((mp = mod_loadmodule(dep_name, 0, NULL)) == NULL) {
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/* Load failed; discard everything */
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while (base_mod != NULL) {
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mp = base_mod;
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base_mod = base_mod->m_next;
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mod_discard(mp);
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}
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last_mod->m_next = NULL;
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loadaddr = last_mod->m_addr + last_mod->m_size;
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/* error message already set by mod_loadmodule */
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return(CMD_ERROR);
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}
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}
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return(CMD_OK);
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}
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/*
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* We've been asked to load (name) as (type), so just suck it in,
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* no arguments or anything.
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*/
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int
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mod_loadobj(char *type, char *name)
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{
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struct loaded_module *mp;
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char *cp;
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int fd, got;
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vm_offset_t laddr;
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/* We can't load first */
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if ((mod_findmodule(NULL, NULL)) == NULL) {
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command_errmsg = "can't load file before kernel";
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return(CMD_ERROR);
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}
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/* locate the file on the load path */
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cp = mod_searchfile(name);
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if (cp == NULL) {
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sprintf(command_errbuf, "can't find '%s'", name);
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return(CMD_ERROR);
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}
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name = cp;
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if ((fd = open(name, O_RDONLY)) < 0) {
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sprintf(command_errbuf, "can't open '%s': %s", name, strerror(errno));
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return(CMD_ERROR);
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}
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laddr = loadaddr;
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for (;;) {
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/* read in 4k chunks; size is not really important */
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got = archsw.arch_readin(fd, laddr, 4096);
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if (got == 0) /* end of file */
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break;
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if (got < 0) { /* error */
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sprintf(command_errbuf, "error reading '%s': %s", name, strerror(errno));
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return(CMD_ERROR);
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}
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laddr += got;
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}
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/* Looks OK so far; create & populate control structure */
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mp = malloc(sizeof(struct loaded_module));
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mp->m_name = strdup(name);
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mp->m_type = strdup(type);
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mp->m_args = NULL;
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mp->m_metadata = NULL;
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mp->m_loader = -1;
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mp->m_addr = loadaddr;
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mp->m_size = laddr - loadaddr;
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/* recognise space consumption */
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loadaddr = laddr;
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/* Add to the list of loaded modules */
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mod_append(mp);
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return(CMD_OK);
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}
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/*
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* Load the module (name), pass it (argc),(argv).
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* Don't do any dependancy checking.
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*/
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static struct loaded_module *
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mod_loadmodule(char *name, int argc, char *argv[])
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{
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struct loaded_module *mp;
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int i, err;
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char *cp;
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/* locate the module on the search path */
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cp = mod_searchmodule(name);
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if (cp == NULL) {
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sprintf(command_errbuf, "can't find '%s'", name);
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return(NULL);
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}
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name = cp;
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err = 0;
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for (i = 0, mp = NULL; (module_formats[i] != NULL) && (mp == NULL); i++) {
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if ((err = (module_formats[i]->l_load)(name, loadaddr, &mp)) != 0) {
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/* Unknown to this handler? */
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if (err == EFTYPE)
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continue;
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/* Fatal error */
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sprintf(command_errbuf, "can't load module '%s': %s", name, strerror(err));
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return(NULL);
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} else {
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/* Load was OK, set args */
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mp->m_args = unargv(argc, argv);
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/* where can we put the next one? */
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loadaddr = mp->m_addr + mp->m_size;
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/* remember the loader */
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mp->m_loader = i;
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/* Add to the list of loaded modules */
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mod_append(mp);
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break;
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}
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}
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if (err == EFTYPE)
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sprintf(command_errbuf, "don't know how to load module '%s'", name);
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return(mp);
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}
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/*
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* Search the modules from (mp) onwards, and return the name of the
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* first unresolved dependancy, or NULL if none were found.
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*/
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static char *
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mod_searchdep(struct loaded_module *mp)
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{
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struct kld_module_identifier *ident, *dident;
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struct kld_module_dependancy *deps, *dp;
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struct module_metadata *md;
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struct loaded_module *dmp;
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int dindex;
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for (; mp != NULL; mp = mp->m_next) {
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/*
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* Get KLD module data
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*/
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ident = NULL;
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deps = NULL;
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if ((md = mod_findmetadata(mp, MODINFOMD_KLDIDENT)) != NULL)
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ident = (struct kld_module_identifier *)md->md_data;
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if ((md = mod_findmetadata(mp, MODINFOMD_KLDDEP)) != NULL)
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deps = (struct kld_module_dependancy *)md->md_data;
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/*
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* Both must exist for this module to depend on anything
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*/
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if ((ident != NULL) && (deps != NULL)) {
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/* Iterate over dependancies */
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for (dindex = 0; dindex < ident->ki_ndeps; dindex++) {
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dp = KLD_GETDEP(ident, deps, dindex);
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/*
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* Look for a module matching the dependancy; if we don't have it,
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* we need it.
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*/
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if ((dmp = mod_findmodule(dp->kd_name, NULL)) == NULL)
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return(dp->kd_name);
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/* Version check */
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if ((md = mod_findmetadata(dmp, MODINFOMD_KLDIDENT)) != NULL) {
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dident = (struct kld_module_identifier *)md->md_data;
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if (dp->kd_version != dident->ki_version)
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printf("module '%s' requires '%s' version %d, but version %d is loaded\n",
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mp->m_name, dp->kd_name, dp->kd_version, dident->ki_version);
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}
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}
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}
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}
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return(NULL);
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}
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/*
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* Find a module matching (name) and (type).
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* NULL may be passed as a wildcard to either.
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*/
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struct loaded_module *
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mod_findmodule(char *name, char *type)
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{
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struct loaded_module *mp;
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for (mp = loaded_modules; mp != NULL; mp = mp->m_next) {
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if (((name == NULL) || !strcmp(name, mp->m_name)) &&
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((type == NULL) || !strcmp(type, mp->m_type)))
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break;
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}
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return(mp);
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}
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/*
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* Make a copy of (size) bytes of data from (p), and associate them as
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* metadata of (type) to the module (mp).
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*/
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void
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mod_addmetadata(struct loaded_module *mp, int type, size_t size, void *p)
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{
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struct module_metadata *md;
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md = malloc(sizeof(struct module_metadata) + size);
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md->md_size = size;
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md->md_type = type;
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bcopy(p, md->md_data, size);
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md->md_next = mp->m_metadata;
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mp->m_metadata = md;
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}
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/*
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* Find a metadata object of (type) associated with the module
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* (mp)
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*/
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struct module_metadata *
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mod_findmetadata(struct loaded_module *mp, int type)
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{
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struct module_metadata *md;
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for (md = mp->m_metadata; md != NULL; md = md->md_next)
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if (md->md_type == type)
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break;
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return(md);
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}
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/*
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* Attempt to find the file (name) on the module searchpath.
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* If (name) is qualified in any way, we simply check it and
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* return it or NULL. If it is not qualified, then we attempt
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* to construct a path using entries in the environment variable
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* module_path.
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*
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* The path we return a pointer to need never be freed, as we manage
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* it internally.
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*/
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static char *
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mod_searchfile(char *name)
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{
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static char *result = NULL;
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char *path, *sp;
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const char *cp;
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struct stat sb;
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/* Don't look for nothing */
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if ((name == NULL) || (*name == 0))
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return(name);
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/*
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* See if there's a device on the front, or a directory name.
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*/
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archsw.arch_getdev(NULL, name, &cp);
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if ((cp != name) || (strchr(name, '/') != NULL)) {
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/* Qualified, so just see if it exists */
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if (stat(name, &sb) == 0)
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return(name);
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return(NULL);
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}
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/*
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* Get the module path
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*/
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if ((cp = getenv("module_path")) == NULL)
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cp = default_searchpath;
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sp = path = strdup(cp);
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/*
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* Traverse the path, splitting off ';'-delimited components.
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*/
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if (result != NULL)
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free(result);
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while((cp = strsep(&path, ";")) != NULL) {
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result = malloc(strlen(cp) + strlen(name) + 5);
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strcpy(result, cp);
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if (cp[strlen(cp) - 1] != '/')
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strcat(result, "/");
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strcat(result, name);
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/* printf("search '%s'\n", result); */
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if ((stat(result, &sb) == 0) &&
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S_ISREG(sb.st_mode))
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break;
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free(result);
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result = NULL;
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}
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free(sp);
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return(result);
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}
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/*
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* Attempt to locate the file containing the module (name)
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*/
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static char *
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mod_searchmodule(char *name)
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{
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char *tn, *result;
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/* Look for (name).ko */
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tn = malloc(strlen(name) + 3 + 1);
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strcpy(tn, name);
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strcat(tn, ".ko");
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result = mod_searchfile(tn);
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free(tn);
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/* Look for just (name) (useful for finding kernels) */
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if (result == NULL)
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result = mod_searchfile(name);
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return(result);
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}
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/*
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* Throw a module away
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*/
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void
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mod_discard(struct loaded_module *mp)
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{
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struct module_metadata *md;
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if (mp != NULL) {
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while (mp->m_metadata != NULL) {
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md = mp->m_metadata;
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mp->m_metadata = mp->m_metadata->md_next;
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free(md);
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}
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if (mp->m_name != NULL)
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free(mp->m_name);
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if (mp->m_type != NULL)
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free(mp->m_type);
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if (mp->m_args != NULL)
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free(mp->m_args);
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free(mp);
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}
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}
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/*
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* Allocate a new module; must be used instead of malloc()
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* to ensure safe initialisation.
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*/
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struct loaded_module *
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mod_allocmodule(void)
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{
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struct loaded_module *mp;
|
|
|
|
if ((mp = malloc(sizeof(struct loaded_module))) != NULL) {
|
|
bzero(mp, sizeof(struct loaded_module));
|
|
}
|
|
return(mp);
|
|
}
|
|
|
|
|
|
/*
|
|
* Add a module to the chain
|
|
*/
|
|
static void
|
|
mod_append(struct loaded_module *mp)
|
|
{
|
|
struct loaded_module *cm;
|
|
|
|
/* Append to list of loaded modules */
|
|
mp->m_next = NULL;
|
|
if (loaded_modules == NULL) {
|
|
loaded_modules = mp;
|
|
} else {
|
|
for (cm = loaded_modules; cm->m_next != NULL; cm = cm->m_next)
|
|
;
|
|
cm->m_next = mp;
|
|
}
|
|
}
|