922 lines
20 KiB
C
922 lines
20 KiB
C
/* $NetBSD: kern_lkm.c,v 1.60 2002/09/18 22:59:36 lha Exp $ */
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/*
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* Copyright (c) 1994 Christopher G. Demetriou
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* Copyright (c) 1992 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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* XXX it's not really safe to unload *any* of the types which are
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* currently loadable; e.g. you could unload a syscall which was being
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* blocked in, etc. In the long term, a solution should be come up
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* with, but "not right now." -- cgd
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: kern_lkm.c,v 1.60 2002/09/18 22:59:36 lha Exp $");
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#include "opt_ddb.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/ioctl.h>
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#include <sys/tty.h>
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#include <sys/file.h>
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#include <sys/proc.h>
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#include <sys/uio.h>
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#include <sys/kernel.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/exec.h>
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#include <sys/syscallargs.h>
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#include <sys/conf.h>
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#include <sys/lkm.h>
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#include <sys/syscall.h>
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#ifdef DDB
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#include <machine/db_machdep.h>
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#include <ddb/db_sym.h>
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#endif
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#include <uvm/uvm_extern.h>
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#if !defined(DEBUG) && defined(LKMDEBUG)
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# define DEBUG
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#endif
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#ifdef DEBUG
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# define LKMDB_INFO 0x01
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# define LKMDB_LOAD 0x02
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int lkmdebug = 0;
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#endif
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#define PAGESIZE 1024 /* kmem_alloc() allocation quantum */
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#define LKM_ALLOC 0x01
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#define LKM_WANT 0x02
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#define LKMS_IDLE 0x00
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#define LKMS_RESERVED 0x01
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#define LKMS_LOADING 0x02
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#define LKMS_UNLOADING 0x08
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static int lkm_v = 0;
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static int lkm_state = LKMS_IDLE;
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#ifndef MAXLKMS
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#define MAXLKMS 20
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#endif
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static struct lkm_table lkmods[MAXLKMS]; /* table of loaded modules */
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static struct lkm_table *curp; /* global for in-progress ops */
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static void lkmunreserve __P((void));
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static int _lkm_syscall __P((struct lkm_table *, int));
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static int _lkm_vfs __P((struct lkm_table *, int));
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static int _lkm_dev __P((struct lkm_table *, int));
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#ifdef STREAMS
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static int _lkm_strmod __P((struct lkm_table *, int));
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#endif
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static int _lkm_exec __P((struct lkm_table *, int));
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static int _lkm_compat __P((struct lkm_table *, int));
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dev_type_open(lkmopen);
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dev_type_close(lkmclose);
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dev_type_ioctl(lkmioctl);
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const struct cdevsw lkm_cdevsw = {
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lkmopen, lkmclose, noread, nowrite, lkmioctl,
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nostop, notty, nopoll, nommap,
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};
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/*ARGSUSED*/
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int
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lkmopen(dev, flag, devtype, p)
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dev_t dev;
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int flag;
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int devtype;
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struct proc *p;
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{
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int error;
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if (minor(dev) != 0)
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return (ENXIO); /* bad minor # */
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/*
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* Use of the loadable kernel module device must be exclusive; we
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* may try to remove this restriction later, but it's really no
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* hardship.
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*/
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while (lkm_v & LKM_ALLOC) {
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if (flag & FNONBLOCK) /* don't hang */
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return (EBUSY);
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lkm_v |= LKM_WANT;
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/*
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* Sleep pending unlock; we use tsleep() to allow
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* an alarm out of the open.
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*/
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error = tsleep((caddr_t)&lkm_v, TTIPRI|PCATCH, "lkmopn", 0);
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if (error)
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return (error); /* leave LKM_WANT set -- no problem */
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}
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lkm_v |= LKM_ALLOC;
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return (0); /* pseudo-device open */
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}
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/*
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* Unreserve the memory associated with the current loaded module; done on
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* a coerced close of the lkm device (close on premature exit of modload)
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* or explicitly by modload as a result of a link failure.
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*/
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static void
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lkmunreserve()
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{
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if (lkm_state == LKMS_IDLE)
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return;
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if (curp && curp->syms) {
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#ifdef DDB
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db_del_symbol_table(curp->private.lkm_any->lkm_name);
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#endif
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uvm_km_free(kernel_map, curp->syms, curp->sym_size);/**/
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curp->syms = 0;
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}
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/*
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* Actually unreserve the memory
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*/
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if (curp && curp->area) {
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uvm_km_free(kernel_map, curp->area, curp->size);/**/
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curp->area = 0;
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}
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lkm_state = LKMS_IDLE;
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}
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int
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lkmclose(dev, flag, mode, p)
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dev_t dev;
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int flag;
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int mode;
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struct proc *p;
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{
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if (!(lkm_v & LKM_ALLOC)) {
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#ifdef DEBUG
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if (lkmdebug & LKMDB_INFO)
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printf("LKM: close before open!\n");
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#endif /* DEBUG */
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return (EBADF);
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}
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/* do this before waking the herd... */
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if (curp && !curp->used) {
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/*
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* If we close before setting used, we have aborted
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* by way of error or by way of close-on-exit from
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* a premature exit of "modload".
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*/
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lkmunreserve(); /* coerce state to LKM_IDLE */
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}
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lkm_v &= ~LKM_ALLOC;
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wakeup((caddr_t)&lkm_v); /* thundering herd "problem" here */
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return (0); /* pseudo-device closed */
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}
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/*ARGSUSED*/
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int
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lkmioctl(dev, cmd, data, flag, p)
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dev_t dev;
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u_long cmd;
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caddr_t data;
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int flag;
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struct proc *p;
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{
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int error = 0;
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int i;
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struct lmc_resrv *resrvp;
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struct lmc_loadbuf *loadbufp;
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struct lmc_unload *unloadp;
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struct lmc_stat *statp;
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char istr[MAXLKMNAME];
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switch(cmd) {
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case LMRESERV: /* reserve pages for a module */
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case LMRESERV_O: /* reserve pages for a module */
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if (securelevel > 0)
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return EPERM;
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if ((flag & FWRITE) == 0) /* only allow this if writing */
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return EPERM;
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resrvp = (struct lmc_resrv *)data;
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/*
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* Find a free slot.
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*/
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for (i = 0; i < MAXLKMS; i++)
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if (!lkmods[i].used)
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break;
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if (i == MAXLKMS) {
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error = ENOMEM; /* no slots available */
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break;
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}
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curp = &lkmods[i];
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curp->id = i; /* self reference slot offset */
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curp->ver = (cmd == LMRESERV) ? LKM_VERSION : LKM_OLDVERSION;
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resrvp->slot = i; /* return slot */
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/*
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* Get memory for module
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*/
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curp->size = resrvp->size;
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curp->area = uvm_km_alloc(kernel_map, curp->size);/**/
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curp->offset = 0; /* load offset */
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resrvp->addr = curp->area; /* ret kernel addr */
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if (cmd == LMRESERV && resrvp->sym_size) {
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curp->sym_size = resrvp->sym_size;
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curp->sym_symsize = resrvp->sym_symsize;
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curp->syms = (u_long)uvm_km_alloc(kernel_map, curp->sym_size);/**/
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curp->sym_offset = 0;
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resrvp->sym_addr = curp->syms; /* ret symbol addr */
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} else {
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curp->sym_size = 0;
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curp->syms = 0;
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curp->sym_offset = 0;
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if (cmd == LMRESERV)
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resrvp->sym_addr = 0;
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}
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#ifdef DEBUG
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if (lkmdebug & LKMDB_INFO) {
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printf("LKM: LMRESERV (actual = 0x%08lx)\n",
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curp->area);
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printf("LKM: LMRESERV (syms = 0x%08lx)\n",
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curp->syms);
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printf("LKM: LMRESERV (adjusted = 0x%08lx)\n",
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trunc_page(curp->area));
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}
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#endif /* DEBUG */
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lkm_state = LKMS_RESERVED;
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break;
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case LMLOADBUF: /* Copy in; stateful, follows LMRESERV */
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if (securelevel > 0)
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return EPERM;
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if ((flag & FWRITE) == 0) /* only allow this if writing */
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return EPERM;
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loadbufp = (struct lmc_loadbuf *)data;
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i = loadbufp->cnt;
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if ((lkm_state != LKMS_RESERVED && lkm_state != LKMS_LOADING)
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|| i < 0
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|| i > MODIOBUF
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|| i > curp->size - curp->offset) {
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error = ENOMEM;
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break;
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}
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/* copy in buffer full of data */
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error = copyin(loadbufp->data,
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(caddr_t)curp->area + curp->offset, i);
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if (error)
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break;
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if ((curp->offset + i) < curp->size) {
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lkm_state = LKMS_LOADING;
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#ifdef DEBUG
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if (lkmdebug & LKMDB_LOAD)
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printf("LKM: LMLOADBUF (loading @ %ld of %ld, i = %d)\n",
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curp->offset, curp->size, i);
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#endif /* DEBUG */
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}
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curp->offset += i;
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break;
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case LMLOADSYMS: /* Copy in; stateful, follows LMRESERV*/
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if ((flag & FWRITE) == 0) /* only allow this if writing */
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return EPERM;
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loadbufp = (struct lmc_loadbuf *)data;
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i = loadbufp->cnt;
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if ((lkm_state != LKMS_LOADING)
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|| i < 0
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|| i > MODIOBUF
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|| i > curp->sym_size - curp->sym_offset) {
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error = ENOMEM;
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break;
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}
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/* copy in buffer full of data*/
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if ((error = copyin(loadbufp->data,
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(caddr_t)(curp->syms) + curp->sym_offset,
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i)) != 0)
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break;
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if ((curp->sym_offset + i) < curp->sym_size) {
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lkm_state = LKMS_LOADING;
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#ifdef DEBUG
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if (lkmdebug & LKMDB_LOAD)
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printf( "LKM: LMLOADSYMS (loading @ %ld of %ld, i = %d)\n",
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curp->sym_offset, curp->sym_size, i);
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#endif /* DEBUG*/
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}
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curp->sym_offset += i;
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break;
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case LMUNRESRV: /* discard reserved pages for a module */
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if (securelevel > 0)
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return EPERM;
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if ((flag & FWRITE) == 0) /* only allow this if writing */
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return EPERM;
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lkmunreserve(); /* coerce state to LKM_IDLE */
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#ifdef DEBUG
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if (lkmdebug & LKMDB_INFO)
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printf("LKM: LMUNRESERV\n");
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#endif /* DEBUG */
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break;
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case LMREADY: /* module loaded: call entry */
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if (securelevel > 0)
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return EPERM;
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if ((flag & FWRITE) == 0) /* only allow this if writing */
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return EPERM;
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if (lkm_state != LKMS_LOADING) {
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#ifdef DEBUG
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if (lkmdebug & LKMDB_INFO)
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printf("lkm_state is %02x\n", lkm_state);
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#endif /* DEBUG */
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return ENXIO;
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}
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if (curp->size - curp->offset > 0)
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/* The remainder must be bss, so we clear it */
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memset((caddr_t)curp->area + curp->offset, 0,
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curp->size - curp->offset);
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curp->entry = (int (*) __P((struct lkm_table *, int, int)))
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(*((long *) (data)));
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/* call entry(load)... (assigns "private" portion) */
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error = (*(curp->entry))(curp, LKM_E_LOAD, curp->ver);
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if (error) {
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/*
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* Module may refuse loading or may have a
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* version mismatch...
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*/
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lkm_state = LKMS_UNLOADING; /* for lkmunreserve */
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lkmunreserve(); /* free memory */
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curp->used = 0; /* free slot */
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#ifdef DEBUG
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if (lkmdebug & LKMDB_INFO)
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printf("lkm entry point failed with error %d\n",
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error);
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#endif /* DEBUG */
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break;
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}
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curp->used = 1;
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#ifdef DEBUG
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if (lkmdebug & LKMDB_INFO)
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printf("LKM: LMREADY\n");
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#endif /* DEBUG */
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#ifdef DDB
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if (curp->syms && curp->sym_offset >= curp->sym_size) {
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db_add_symbol_table((caddr_t)curp->syms,
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(caddr_t)curp->syms + curp->sym_symsize,
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curp->private.lkm_any->lkm_name,
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(caddr_t)curp->syms);
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#ifdef DEBUG
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if (lkmdebug & LKMDB_INFO)
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printf( "DDB symbols added!\n" );
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#endif
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}
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#endif
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lkm_state = LKMS_IDLE;
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break;
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case LMUNLOAD: /* unload a module */
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if (securelevel > 0)
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return EPERM;
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if ((flag & FWRITE) == 0) /* only allow this if writing */
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return EPERM;
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unloadp = (struct lmc_unload *)data;
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if ((i = unloadp->id) == -1) { /* unload by name */
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/*
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* Copy name and lookup id from all loaded
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* modules. May fail.
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*/
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error = copyinstr(unloadp->name, istr, MAXLKMNAME-1,
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NULL);
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if (error)
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break;
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/*
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* look up id...
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*/
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for (i = 0; i < MAXLKMS; i++) {
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if (!lkmods[i].used)
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continue;
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if (!strcmp(istr,
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lkmods[i].private.lkm_any->lkm_name))
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break;
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}
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}
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/*
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* Range check the value; on failure, return EINVAL
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*/
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if (i < 0 || i >= MAXLKMS) {
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error = EINVAL;
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break;
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}
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curp = &lkmods[i];
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if (!curp->used) {
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error = ENOENT;
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break;
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}
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/* call entry(unload) */
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if ((*(curp->entry))(curp, LKM_E_UNLOAD, curp->ver)) {
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error = EBUSY;
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break;
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}
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lkm_state = LKMS_UNLOADING; /* non-idle for lkmunreserve */
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lkmunreserve(); /* free memory */
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curp->used = 0; /* free slot */
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break;
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case LMSTAT: /* stat a module by id/name */
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/* allow readers and writers to stat */
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statp = (struct lmc_stat *)data;
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if ((i = statp->id) == -1) { /* stat by name */
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/*
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* Copy name and lookup id from all loaded
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* modules.
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*/
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copystr(statp->name, istr, MAXLKMNAME-1, (size_t *)0);
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/*
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* look up id...
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*/
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for (i = 0; i < MAXLKMS; i++) {
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if (!lkmods[i].used)
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continue;
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if (!strcmp(istr,
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lkmods[i].private.lkm_any->lkm_name))
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break;
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}
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if (i == MAXLKMS) { /* Not found */
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error = ENOENT;
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break;
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}
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}
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|
/*
|
|
* Range check the value; on failure, return EINVAL
|
|
*/
|
|
if (i < 0 || i >= MAXLKMS) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
curp = &lkmods[i];
|
|
|
|
if (!curp->used) { /* Not found */
|
|
error = ENOENT;
|
|
break;
|
|
}
|
|
|
|
if ((error = (*curp->entry)(curp, LKM_E_STAT, curp->ver)))
|
|
break;
|
|
|
|
/*
|
|
* Copy out stat information for this module...
|
|
*/
|
|
statp->id = curp->id;
|
|
statp->offset = curp->private.lkm_any->lkm_offset;
|
|
statp->type = curp->private.lkm_any->lkm_type;
|
|
statp->area = curp->area;
|
|
statp->size = curp->size / PAGESIZE;
|
|
statp->private = (unsigned long)curp->private.lkm_any;
|
|
statp->ver = curp->private.lkm_any->lkm_ver;
|
|
copystr(curp->private.lkm_any->lkm_name,
|
|
statp->name,
|
|
MAXLKMNAME - 2,
|
|
(size_t *)0);
|
|
|
|
break;
|
|
|
|
default: /* bad ioctl()... */
|
|
error = ENOTTY;
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Acts like "nosys" but can be identified in sysent for dynamic call
|
|
* number assignment for a limited number of calls.
|
|
*
|
|
* Place holder for system call slots reserved for loadable modules.
|
|
*/
|
|
int
|
|
sys_lkmnosys(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
|
|
return (sys_nosys(p, v, retval));
|
|
}
|
|
|
|
/*
|
|
* A placeholder function for load/unload/stat calls; simply returns zero.
|
|
* Used where people don't want to specify a special function.
|
|
*/
|
|
int
|
|
lkm_nofunc(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
lkmexists(lkmtp)
|
|
struct lkm_table *lkmtp;
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* see if name exists...
|
|
*/
|
|
for (i = 0; i < MAXLKMS; i++) {
|
|
/*
|
|
* An unused module and the one we are testing are not
|
|
* considered.
|
|
*/
|
|
if (!lkmods[i].used || &lkmods[i] == lkmtp)
|
|
continue;
|
|
if (!strcmp(lkmtp->private.lkm_any->lkm_name,
|
|
lkmods[i].private.lkm_any->lkm_name))
|
|
return (1); /* already loaded... */
|
|
}
|
|
|
|
return (0); /* module not loaded... */
|
|
}
|
|
|
|
/*
|
|
* For the loadable system call described by the structure pointed to
|
|
* by lkmtp, load/unload/stat it depending on the cmd requested.
|
|
*/
|
|
static int
|
|
_lkm_syscall(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
struct lkm_syscall *args = lkmtp->private.lkm_syscall;
|
|
int i;
|
|
int error = 0;
|
|
|
|
switch(cmd) {
|
|
case LKM_E_LOAD:
|
|
/* don't load twice! */
|
|
if (lkmexists(lkmtp))
|
|
return (EEXIST);
|
|
|
|
if ((i = args->lkm_offset) == -1) { /* auto */
|
|
/*
|
|
* Search the table looking for a slot...
|
|
*/
|
|
for (i = 0; i < SYS_MAXSYSCALL; i++)
|
|
if (sysent[i].sy_call == sys_lkmnosys)
|
|
break; /* found it! */
|
|
/* out of allocable slots? */
|
|
if (i == SYS_MAXSYSCALL) {
|
|
error = ENFILE;
|
|
break;
|
|
}
|
|
} else { /* assign */
|
|
if (i < 0 || i >= SYS_MAXSYSCALL) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* save old */
|
|
memcpy(&args->lkm_oldent, &sysent[i], sizeof(struct sysent));
|
|
|
|
/* replace with new */
|
|
memcpy(&sysent[i], args->lkm_sysent, sizeof(struct sysent));
|
|
|
|
/* done! */
|
|
args->lkm_offset = i; /* slot in sysent[] */
|
|
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
/* current slot... */
|
|
i = args->lkm_offset;
|
|
|
|
/* replace current slot contents with old contents */
|
|
memcpy(&sysent[i], &args->lkm_oldent, sizeof(struct sysent));
|
|
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* For the loadable virtual file system described by the structure pointed
|
|
* to by lkmtp, load/unload/stat it depending on the cmd requested.
|
|
*/
|
|
static int
|
|
_lkm_vfs(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
struct lkm_vfs *args = lkmtp->private.lkm_vfs;
|
|
int error = 0;
|
|
|
|
switch(cmd) {
|
|
case LKM_E_LOAD:
|
|
/* don't load twice! */
|
|
if (lkmexists(lkmtp))
|
|
return (EEXIST);
|
|
|
|
/* Establish the file system. */
|
|
if ((error = vfs_attach(args->lkm_vfsops)) != 0)
|
|
return (error);
|
|
|
|
/* done! */
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
/* Disestablish the file system. */
|
|
if ((error = vfs_detach(args->lkm_vfsops)) != 0)
|
|
return (error);
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* For the loadable device driver described by the structure pointed to
|
|
* by lkmtp, load/unload/stat it depending on the cmd requested.
|
|
*/
|
|
static int
|
|
_lkm_dev(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
struct lkm_dev *args = lkmtp->private.lkm_dev;
|
|
int error;
|
|
|
|
switch(cmd) {
|
|
case LKM_E_LOAD:
|
|
/* don't load twice! */
|
|
if (lkmexists(lkmtp))
|
|
return (EEXIST);
|
|
|
|
error = devsw_attach(args->lkm_devname,
|
|
args->lkm_bdev, &args->lkm_bdevmaj,
|
|
args->lkm_cdev, &args->lkm_cdevmaj);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
args->lkm_offset =
|
|
LKM_MAKEMAJOR(args->lkm_bdevmaj, args->lkm_cdevmaj);
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
devsw_detach(args->lkm_bdev, args->lkm_cdev);
|
|
args->lkm_bdevmaj = -1;
|
|
args->lkm_cdevmaj = -1;
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
#ifdef STREAMS
|
|
/*
|
|
* For the loadable streams module described by the structure pointed to
|
|
* by lkmtp, load/unload/stat it depending on the cmd requested.
|
|
*/
|
|
static int
|
|
_lkm_strmod(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
struct lkm_strmod *args = lkmtp->private.lkm_strmod;
|
|
int i;
|
|
int error = 0;
|
|
|
|
switch(cmd) {
|
|
case LKM_E_LOAD:
|
|
/* don't load twice! */
|
|
if (lkmexists(lkmtp))
|
|
return (EEXIST);
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
#endif /* STREAMS */
|
|
|
|
/*
|
|
* For the loadable execution class described by the structure pointed to
|
|
* by lkmtp, load/unload/stat it depending on the cmd requested.
|
|
*/
|
|
static int
|
|
_lkm_exec(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
struct lkm_exec *args = lkmtp->private.lkm_exec;
|
|
int error = 0;
|
|
|
|
switch(cmd) {
|
|
case LKM_E_LOAD:
|
|
/* don't load twice! */
|
|
if (lkmexists(lkmtp))
|
|
return (EEXIST);
|
|
|
|
/* this would also fill in the emulation pointer in
|
|
* args->lkm_execsw */
|
|
error = exec_add(args->lkm_execsw, args->lkm_emul);
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
error = exec_remove(args->lkm_execsw);
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* For the loadable compat/emulation class described by the structure pointed to
|
|
* by lkmtp, load/unload/stat it depending on the cmd requested.
|
|
*/
|
|
static int
|
|
_lkm_compat(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
struct lkm_compat *args = lkmtp->private.lkm_compat;
|
|
int error = 0;
|
|
|
|
switch(cmd) {
|
|
case LKM_E_LOAD:
|
|
/* don't load twice! */
|
|
if (lkmexists(lkmtp))
|
|
return (EEXIST);
|
|
|
|
error = emul_register(args->lkm_compat, 0);
|
|
break;
|
|
|
|
case LKM_E_UNLOAD:
|
|
error = emul_unregister(args->lkm_compat->e_name);
|
|
break;
|
|
|
|
case LKM_E_STAT: /* no special handling... */
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* This code handles the per-module type "wiring-in" of loadable modules
|
|
* into existing kernel tables. For "LM_MISC" modules, wiring and unwiring
|
|
* is assumed to be done in their entry routines internal to the module
|
|
* itself.
|
|
*/
|
|
int
|
|
lkmdispatch(lkmtp, cmd)
|
|
struct lkm_table *lkmtp;
|
|
int cmd;
|
|
{
|
|
int error = 0; /* default = success */
|
|
#ifdef DEBUG
|
|
if (lkmdebug & LKMDB_INFO)
|
|
printf( "lkmdispatch: %p %d\n", lkmtp, cmd );
|
|
#endif
|
|
|
|
switch(lkmtp->private.lkm_any->lkm_type) {
|
|
case LM_SYSCALL:
|
|
error = _lkm_syscall(lkmtp, cmd);
|
|
break;
|
|
|
|
case LM_VFS:
|
|
error = _lkm_vfs(lkmtp, cmd);
|
|
break;
|
|
|
|
case LM_DEV:
|
|
error = _lkm_dev(lkmtp, cmd);
|
|
break;
|
|
|
|
#ifdef STREAMS
|
|
case LM_STRMOD:
|
|
{
|
|
struct lkm_strmod *args = lkmtp->private.lkm_strmod;
|
|
}
|
|
break;
|
|
|
|
#endif /* STREAMS */
|
|
|
|
case LM_EXEC:
|
|
error = _lkm_exec(lkmtp, cmd);
|
|
break;
|
|
|
|
case LM_COMPAT:
|
|
error = _lkm_compat(lkmtp, cmd);
|
|
break;
|
|
|
|
case LM_MISC: /* ignore content -- no "misc-specific" procedure */
|
|
break;
|
|
|
|
default:
|
|
error = ENXIO; /* unknown type */
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|