192 lines
6.2 KiB
C
192 lines
6.2 KiB
C
/* $NetBSD: lkminit_misc.c,v 1.2 2001/11/12 23:23:25 lukem Exp $ */
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/*
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* Makefile for miscmod
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*
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* 05 Jun 93 Terry Lambert Split mycall.c out
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* 25 May 93 Terry Lambert Original
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*
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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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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: lkminit_misc.c,v 1.2 2001/11/12 23:23:25 lukem Exp $");
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/mount.h>
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#include <sys/exec.h>
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#include <sys/lkm.h>
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#include <sys/file.h>
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#include <sys/errno.h>
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#include <sys/syscall.h>
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int misccall __P((struct proc *, void *, register_t *));
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int misc_example_lkmentry __P((struct lkm_table *lkmtp, int, int));
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static int miscmod_handle __P((struct lkm_table *, int));
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/*
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* These two entries define our system call and module information. We
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* have 0 arguments to our system call.
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*/
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static struct sysent newent = {
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0, 0, misccall /* # of args, args size, fn pointer*/
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};
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/*
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* Miscellaneous modules must have their own save areas...
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*/
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static struct sysent oldent; /* save are for old callslot entry*/
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MOD_MISC( "miscmod")
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/*
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* This function is called each time the module is loaded or unloaded.
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* Since we are a miscellaneous module, we have to provide whatever
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* code is necessary to patch ourselves into the area we are being
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* loaded to change.
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*
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* For the system call table, we duplicate the code in the kern_lkm.c
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* file for patching into the system call table. We can tell what
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* has been allocated, etc. by virtue of the fact that we know the
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* criteria used by the system call loader interface. We still
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* kick out the copyright to the console here (to give an example).
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*
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* The stat information is basically common to all modules, so there
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* is no real issue involved with stat; we will leave it lkm_nofunc(),
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* since we don't have to do anything about it.
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*/
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static int
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miscmod_handle( lkmtp, cmd)
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struct lkm_table *lkmtp;
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int cmd;
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{
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int i;
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struct lkm_misc *args = lkmtp->private.lkm_misc;
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int err = 0; /* default = success*/
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extern int sys_lkmnosys __P((struct proc *, void *, register_t *));
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switch( cmd) {
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case LKM_E_LOAD:
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/*
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* Don't load twice! (lkmexists() is exported by kern_lkm.c)
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*/
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if( lkmexists( lkmtp))
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return( EEXIST);
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/*
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* This is where we would express a slot preference if
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* we had one; since we don't, we will simply duplicate
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* the "auto" code and forget the other.
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*/
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/*
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* Search the table looking for a slot...
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*/
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for (i = 0; i < SYS_MAXSYSCALL; i++)
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if (sysent[i].sy_call == sys_lkmnosys)
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break; /* found it!*/
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/* out of allocable slots?*/
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if (i == SYS_MAXSYSCALL) {
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err = ENFILE;
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break;
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}
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/* save old -- we must provide our own data area*/
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bcopy( &sysent[ i], &oldent, sizeof( struct sysent));
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/* replace with new*/
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bcopy( &newent, &sysent[ i], sizeof( struct sysent));
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/* done!*/
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args->lkm_offset = i; /* slot in sysent[]*/
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/* if we make it to here, print copyright on console*/
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printf( "\nSample Loaded miscellaneous module (system call)\n");
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printf( "Copyright (c) 1993\n");
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printf( "Terrence R. Lambert\n");
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printf( "All rights reserved\n");
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break; /* Success*/
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case LKM_E_UNLOAD:
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/* current slot...*/
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i = args->lkm_offset;
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/* replace current slot contents with old contents*/
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bcopy( &oldent, &sysent[ i], sizeof( struct sysent));
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break; /* Success*/
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default: /* we only understand load/unload*/
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err = EINVAL;
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break;
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}
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return(err);
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}
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/*
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* External entry point; should generally match name of .o file + '_lkmentry'.
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* The arguments are always the same for all loaded modules. The "load",
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* "unload", and "stat" functions in "DISPATCH" will be called under
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* their respective circumstances. If no function is desired, lkm_nofunc()
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* should be supplied. They are called with the same arguments (cmd is
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* included to allow the use of a single function, ver is included for
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* version matching between modules and the kernel loader for the modules).
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*
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* Since we expect to link in the kernel and add external symbols to
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* the kernel symbol name space in a future version, generally all
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* functions used in the implementation of a particular module should
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* be static unless they are expected to be seen in other modules or
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* to resolve unresolved symbols alread existing in the kernel (the
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* second case is not likely to ever occur).
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*
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* The entry point should return 0 unless it is refusing load (in which
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* case it should return an errno from errno.h).
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*/
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int
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misc_example_lkmentry( lkmtp, cmd, ver)
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struct lkm_table *lkmtp;
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int cmd, ver;
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{
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DISPATCH(lkmtp,cmd,ver,miscmod_handle,miscmod_handle,lkm_nofunc)
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}
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