OpenGrok

/*	$NetBSD: fileload.c,v 1.5 2014/03/25 18:35:32 christos Exp $	*/

/*-
 * Copyright (c) 1998 Michael Smith <msmith (at) freebsd.org>
 * 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.
 */

#include <sys/cdefs.h>

/*
 * file/module function dispatcher, support, etc.
 */

#include <lib/libsa/stand.h>
#include <lib/libsa/loadfile.h>
#include <lib/libkern/libkern.h>
#include <sys/param.h>
#include <sys/queue.h>

#include "bootstrap.h"

static int			file_load(char *filename, vaddr_t dest, struct preloaded_file **result);
static int			file_havepath(const char *name);
static void			file_insert_tail(struct preloaded_file *mp);

/* load address should be tweaked by first module loaded (kernel) */
static vaddr_t	loadaddr = 0;

struct preloaded_file *preloaded_files = NULL;

/*
 * load a kernel from disk.
 *
 * kernels are loaded as:
 *
 * load <path> <options>
 */

int
command_load(int argc, char *argv[])
{
    char	*typestr;
    int		dofile, dokld, ch;

    dokld = dofile = 0;
    optind = 1;
    optreset = 1;
    typestr = NULL;
    if (argc == 1) {
	command_seterr("no filename specified");
	return(CMD_ERROR);
    }
    while ((ch = getopt(argc, argv, "k:")) != -1) {
	switch(ch) {
	case 'k':
	    dokld = 1;
	    break;
	case '?':
	default:
	    /* getopt has already reported an error */
	    return(CMD_OK);
	}
    }
    argv += (optind - 1);
    argc -= (optind - 1);

    /*
     * Do we have explicit KLD load ?
     */
    if (dokld || file_havepath(argv[1])) {
	int error = file_loadkernel(argv[1], argc - 2, argv + 2);
	if (error == EEXIST)
	    command_seterr("warning: KLD '%s' already loaded", argv[1]);
	return error == 0 ? CMD_OK : CMD_ERROR;
    }
    return CMD_OK;
}


int
command_unload(int argc, char *argv[])
{
    struct preloaded_file	*fp;

    while (preloaded_files != NULL) {
	fp = preloaded_files;
	preloaded_files = preloaded_files->f_next;
	file_discard(fp);
    }
    loadaddr = 0;
    unsetenv("kernelname");
    return(CMD_OK);
}


int
command_lskern(int argc, char *argv[])
{
    struct preloaded_file	*fp;
    char			lbuf[80];
    int				ch, verbose;

    verbose = 0;
    optind = 1;
    optreset = 1;

    pager_open();
    for (fp = preloaded_files; fp; fp = fp->f_next) {
	snprintf(lbuf, sizeof(lbuf), " %p: %s (%s, 0x%lx)\n",
		(void *) fp->f_addr, fp->f_name, fp->f_type, (long) fp->f_size);
	pager_output(lbuf);
	if (fp->f_args != NULL) {
	    pager_output("    args: ");
	    pager_output(fp->f_args);
	    pager_output("\n");
	}
    }
    pager_close();
    return(CMD_OK);
}

/*
 * File level interface, functions file_*
 */
int
file_load(char *filename, vaddr_t dest, struct preloaded_file **result)
{
    struct preloaded_file *fp;
    int error;
    int i;

    error = EFTYPE;
    for (i = 0, fp = NULL; file_formats[i] && fp == NULL; i++) {
	error = (file_formats[i]->l_load)(filename, dest, &fp);
	if (error == 0) {
	    fp->f_loader = i;		/* remember the loader */
	    *result = fp;
	    break;
	}
	if (error == EFTYPE)
	    continue;		/* Unknown to this handler? */
	if (error) {
	    command_seterr("can't load file '%s': %s",
		filename, strerror(error));
	    break;
	}
    }
    return (error);
}

/*
 * Load specified KLD. If path is omitted, then try to locate it via
 * search path.
 */
int
file_loadkernel(char *filename, int argc, char *argv[])
{
    struct preloaded_file	*fp, *last_file;
    int				err;

    /*
     * Check if KLD already loaded
     */
    fp = file_findfile(filename, NULL);
    if (fp) {
	command_seterr("warning: KLD '%s' already loaded", filename);
	free(filename);
	return (0);
    }
    for (last_file = preloaded_files;
	 last_file != NULL && last_file->f_next != NULL;
	 last_file = last_file->f_next)
	;

    do {
	err = file_load(filename, loadaddr, &fp);
	if (err)
	    break;
	fp->f_args = unargv(argc, argv);
	loadaddr = fp->f_addr + fp->f_size;
	file_insert_tail(fp);		/* Add to the list of loaded files */
    } while(0);
    if (err == EFTYPE)
	command_seterr("don't know how to load module '%s'", filename);
    if (err && fp)
	file_discard(fp);
    free(filename);
    return (err);
}

/*
 * Find a file matching (name) and (type).
 * NULL may be passed as a wildcard to either.
 */
struct preloaded_file *
file_findfile(char *name, char *type)
{
    struct preloaded_file *fp;

    for (fp = preloaded_files; fp != NULL; fp = fp->f_next) {
	if (((name == NULL) || !strcmp(name, fp->f_name)) &&
	    ((type == NULL) || !strcmp(type, fp->f_type)))
	    break;
    }
    return (fp);
}

/*
 * Check if file name have any qualifiers
 */
static int
file_havepath(const char *name)
{
    const char		*cp;

    archsw.arch_getdev(NULL, name, &cp);
    return (cp != name || strchr(name, '/') != NULL);
}

/*
 * Throw a file away
 */
void
file_discard(struct preloaded_file *fp)
{
    if (fp == NULL)
	return;
    if (fp->f_name != NULL)
	free(fp->f_name);
    if (fp->f_type != NULL)
        free(fp->f_type);
    if (fp->f_args != NULL)
        free(fp->f_args);
    if (fp->marks != NULL)
	free(fp->marks);
    free(fp);
}

/*
 * Allocate a new file; must be used instead of malloc()
 * to ensure safe initialisation.
 */
struct preloaded_file *
file_alloc(void)
{
    struct preloaded_file	*fp;

    if ((fp = alloc(sizeof(struct preloaded_file))) != NULL) {
	memset(fp, 0, sizeof(struct preloaded_file));
/*
	if (fp->marks = alloc(sizeof(u_long))) {
		memset(fp->marks, 0, sizeof(u_long));
	}
*/
    }
    return (fp);
}

/*
 * Add a module to the chain
 */
static void
file_insert_tail(struct preloaded_file *fp)
{
    struct preloaded_file	*cm;

    /* Append to list of loaded file */
    fp->f_next = NULL;
    if (preloaded_files == NULL) {
	preloaded_files = fp;
    } else {
	for (cm = preloaded_files; cm->f_next != NULL; cm = cm->f_next)
	    ;
	cm->f_next = fp;
    }
}