mirror of
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a2c99e3e72
for DDB to use its symbol tables.
577 lines
13 KiB
C
577 lines
13 KiB
C
/*-
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* Copyright (c) 1997 Doug Rabson
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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: kern_linker.c,v 1.6 1998/01/01 08:56:24 bde Exp $
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/sysproto.h>
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#include <sys/sysent.h>
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#include <sys/proc.h>
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#include <sys/lock.h>
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#include <machine/cpu.h>
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#include <sys/module.h>
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#include <sys/linker.h>
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#include <sys/unistd.h>
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MALLOC_DEFINE(M_LINKER, "kld", "kernel linker");
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linker_file_t linker_current_file;
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static struct lock lock; /* lock for the file list */
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static linker_class_list_t classes;
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static linker_file_list_t files;
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static int next_file_id = 1;
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static void
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linker_init(void* arg)
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{
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lockinit(&lock, PVM, "klink", 0, 0);
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TAILQ_INIT(&classes);
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TAILQ_INIT(&files);
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}
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SYSINIT(linker, SI_SUB_KMEM, SI_ORDER_SECOND, linker_init, 0);
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int
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linker_add_class(const char* desc, void* priv,
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struct linker_class_ops* ops)
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{
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linker_class_t lc;
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lc = malloc(sizeof(struct linker_class), M_LINKER, M_NOWAIT);
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if (!lc)
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return ENOMEM;
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lc->desc = desc;
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lc->priv = priv;
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lc->ops = ops;
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TAILQ_INSERT_HEAD(&classes, lc, link);
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return 0;
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}
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static void
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linker_file_sysinit(linker_file_t lf)
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{
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struct linker_set* sysinits;
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struct sysinit** sipp;
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struct sysinit** xipp;
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struct sysinit* save;
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linker_current_file = lf;
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KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n",
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lf->filename));
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sysinits = (struct linker_set*)
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linker_file_lookup_symbol(lf, "sysinit_set", 0);
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if (!sysinits)
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return;
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/*
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* Perform a bubble sort of the system initialization objects by
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* their subsystem (primary key) and order (secondary key).
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*
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* Since some things care about execution order, this is the
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* operation which ensures continued function.
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*/
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for( sipp = (struct sysinit **)sysinits->ls_items; *sipp; sipp++) {
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for( xipp = sipp + 1; *xipp; xipp++) {
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if( (*sipp)->subsystem < (*xipp)->subsystem ||
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( (*sipp)->subsystem == (*xipp)->subsystem &&
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(*sipp)->order < (*xipp)->order))
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continue; /* skip*/
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save = *sipp;
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*sipp = *xipp;
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*xipp = save;
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}
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}
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/*
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* Traverse the (now) ordered list of system initialization tasks.
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* Perform each task, and continue on to the next task.
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*
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* The last item on the list is expected to be the scheduler,
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* which will not return.
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*/
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for( sipp = (struct sysinit **)sysinits->ls_items; *sipp; sipp++) {
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if( (*sipp)->subsystem == SI_SUB_DUMMY)
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continue; /* skip dummy task(s)*/
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switch( (*sipp)->type) {
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case SI_TYPE_DEFAULT:
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/* no special processing*/
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(*((*sipp)->func))( (*sipp)->udata);
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break;
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case SI_TYPE_KTHREAD:
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#if !defined(SMP)
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/* kernel thread*/
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if (fork1(&proc0, RFFDG|RFPROC|RFMEM))
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panic("fork kernel thread");
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cpu_set_fork_handler(pfind(proc0.p_retval[0]),
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(*sipp)->func, (*sipp)->udata);
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break;
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#endif
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case SI_TYPE_KPROCESS:
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/* kernel thread*/
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if (fork1(&proc0, RFFDG|RFPROC))
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panic("fork kernel process");
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cpu_set_fork_handler(pfind(proc0.p_retval[0]),
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(*sipp)->func, (*sipp)->udata);
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break;
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default:
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panic( "linker_file_sysinit: unrecognized init type");
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}
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}
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}
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int
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linker_load_file(const char* filename, linker_file_t* result)
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{
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linker_class_t lc;
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linker_file_t lf;
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int error = 0;
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lf = linker_find_file_by_name(filename);
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if (lf) {
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KLD_DPF(FILE, ("linker_load_file: file %s is already loaded, incrementing refs\n", filename));
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*result = lf;
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lf->refs++;
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goto out;
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}
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lf = NULL;
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for (lc = TAILQ_FIRST(&classes); lc; lc = TAILQ_NEXT(lc, link)) {
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KLD_DPF(FILE, ("linker_load_file: trying to load %s as %s\n",
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filename, lc->desc));
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if (error = lc->ops->load_file(filename, &lf))
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goto out;
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if (lf) {
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linker_file_sysinit(lf);
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*result = lf;
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goto out;
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}
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}
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error = ENOEXEC; /* format not recognised */
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out:
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return error;
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}
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linker_file_t
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linker_find_file_by_name(const char* filename)
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{
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linker_file_t lf = 0;
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lockmgr(&lock, LK_SHARED, 0, curproc);
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for (lf = TAILQ_FIRST(&files); lf; lf = TAILQ_NEXT(lf, link))
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if (!strcmp(lf->filename, filename))
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break;
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lockmgr(&lock, LK_RELEASE, 0, curproc);
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return lf;
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}
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linker_file_t
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linker_find_file_by_id(int fileid)
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{
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linker_file_t lf = 0;
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lockmgr(&lock, LK_SHARED, 0, curproc);
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for (lf = TAILQ_FIRST(&files); lf; lf = TAILQ_NEXT(lf, link))
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if (lf->id == fileid)
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break;
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lockmgr(&lock, LK_RELEASE, 0, curproc);
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return lf;
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}
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linker_file_t
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linker_make_file(const char* filename, void* priv, struct linker_file_ops* ops)
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{
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linker_file_t lf = 0;
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int namelen;
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KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename));
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lockmgr(&lock, LK_EXCLUSIVE|LK_RETRY, 0, curproc);
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namelen = strlen(filename) + 1;
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lf = malloc(sizeof(struct linker_file) + namelen, M_LINKER, M_WAITOK);
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if (!lf)
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goto out;
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lf->refs = 1;
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lf->userrefs = 0;
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lf->filename = (char*) (lf + 1);
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strcpy(lf->filename, filename);
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lf->id = next_file_id++;
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lf->ndeps = 0;
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lf->deps = NULL;
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STAILQ_INIT(&lf->common);
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TAILQ_INIT(&lf->modules);
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lf->priv = priv;
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lf->ops = ops;
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TAILQ_INSERT_TAIL(&files, lf, link);
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out:
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lockmgr(&lock, LK_RELEASE, 0, curproc);
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return lf;
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}
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int
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linker_file_unload(linker_file_t file)
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{
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module_t mod, next;
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struct common_symbol* cp;
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int error = 0;
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int i;
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KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", lf->refs));
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lockmgr(&lock, LK_EXCLUSIVE|LK_RETRY, 0, curproc);
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if (file->refs == 1) {
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KLD_DPF(FILE, ("linker_file_unload: file is unloading, informing modules\n"));
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/*
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* Inform any modules associated with this file.
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*/
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for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) {
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next = module_getfnext(mod);
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/*
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* Give the module a chance to veto the unload.
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*/
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if (error = module_unload(mod)) {
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KLD_DPF(FILE, ("linker_file_unload: module %x vetoes unload\n",
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mod));
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lockmgr(&lock, LK_RELEASE, 0, curproc);
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goto out;
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}
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module_release(mod);
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}
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}
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file->refs--;
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if (file->refs > 0) {
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lockmgr(&lock, LK_RELEASE, 0, curproc);
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goto out;
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}
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TAILQ_REMOVE(&files, file, link);
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lockmgr(&lock, LK_RELEASE, 0, curproc);
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for (i = 0; i < file->ndeps; i++)
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linker_file_unload(file->deps[i]);
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free(file->deps, M_LINKER);
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for (cp = STAILQ_FIRST(&file->common); cp;
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cp = STAILQ_FIRST(&file->common)) {
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STAILQ_REMOVE(&file->common, cp, common_symbol, link);
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free(cp, M_LINKER);
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}
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file->ops->unload(file);
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free(file, M_LINKER);
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out:
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return error;
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}
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int
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linker_file_add_dependancy(linker_file_t file, linker_file_t dep)
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{
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linker_file_t* newdeps;
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newdeps = malloc((file->ndeps + 1) * sizeof(linker_file_t*),
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M_LINKER, M_WAITOK);
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if (newdeps == NULL)
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return ENOMEM;
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if (file->deps) {
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bcopy(file->deps, newdeps, file->ndeps * sizeof(linker_file_t*));
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free(file->deps, M_LINKER);
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}
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file->deps = newdeps;
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file->deps[file->ndeps] = dep;
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file->ndeps++;
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return 0;
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}
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caddr_t
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linker_file_lookup_symbol(linker_file_t file, const char* name, int deps)
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{
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linker_sym_t sym;
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linker_symval_t symval;
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caddr_t address;
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size_t common_size = 0;
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int i;
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KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%x, name=%s, deps=%d",
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file, name, deps));
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if (file->ops->lookup_symbol(file, name, &sym) == 0) {
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file->ops->symbol_values(file, sym, &symval);
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if (symval.value == 0)
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/*
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* For commons, first look them up in the dependancies and
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* only allocate space if not found there.
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*/
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common_size = symval.size;
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else
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return symval.value;
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}
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if (deps)
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for (i = 0; i < file->ndeps; i++) {
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address = linker_file_lookup_symbol(file->deps[i], name, 0);
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if (address)
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return address;
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}
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if (common_size > 0) {
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/*
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* This is a common symbol which was not found in the
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* dependancies. We maintain a simple common symbol table in
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* the file object.
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*/
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struct common_symbol* cp;
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for (cp = STAILQ_FIRST(&file->common); cp;
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cp = STAILQ_NEXT(cp, link))
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if (!strcmp(cp->name, name))
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return cp->address;
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/*
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* Round the symbol size up to align.
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*/
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common_size = (common_size + sizeof(int) - 1) & -sizeof(int);
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cp = malloc(sizeof(struct common_symbol)
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+ common_size
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+ strlen(name) + 1,
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M_LINKER, M_WAITOK);
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if (!cp)
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return 0;
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cp->address = (caddr_t) (cp + 1);
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cp->name = cp->address + common_size;
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strcpy(cp->name, name);
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bzero(cp->address, common_size);
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STAILQ_INSERT_TAIL(&file->common, cp, link);
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return cp->address;
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}
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return 0;
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}
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/*
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* Syscalls.
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*/
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int
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kldload(struct proc* p, struct kldload_args* uap)
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{
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char* filename = NULL;
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linker_file_t lf;
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int error = 0;
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p->p_retval[0] = -1;
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if (securelevel > 0)
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return EPERM;
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if (error = suser(p->p_ucred, &p->p_acflag))
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return error;
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filename = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
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if (error = copyinstr(SCARG(uap, file), filename, MAXPATHLEN, NULL))
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goto out;
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if (error = linker_load_file(uap->file, &lf))
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goto out;
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lf->userrefs++;
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p->p_retval[0] = lf->id;
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out:
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if (filename)
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free(filename, M_TEMP);
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return error;
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}
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int
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kldunload(struct proc* p, struct kldunload_args* uap)
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{
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linker_file_t lf;
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int error = 0;
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if (securelevel > 0)
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return EPERM;
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if (error = suser(p->p_ucred, &p->p_acflag))
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return error;
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lf = linker_find_file_by_id(SCARG(uap, fileid));
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if (lf) {
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KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
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if (lf->userrefs == 0) {
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printf("linkerunload: attempt to unload file which was not loaded by user\n");
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error = EBUSY;
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goto out;
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}
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lf->userrefs--;
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error = linker_file_unload(lf);
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} else
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error = ENOENT;
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out:
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return error;
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}
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int
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kldfind(struct proc* p, struct kldfind_args* uap)
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{
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char* filename = NULL;
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linker_file_t lf;
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int error = 0;
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p->p_retval[0] = -1;
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filename = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
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if (error = copyinstr(SCARG(uap, file), filename, MAXPATHLEN, NULL))
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goto out;
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lf = linker_find_file_by_name(filename);
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if (lf)
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p->p_retval[0] = lf->id;
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else
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error = ENOENT;
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out:
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if (filename)
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free(filename, M_TEMP);
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return error;
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}
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int
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kldnext(struct proc* p, struct kldnext_args* uap)
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{
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linker_file_t lf;
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int error = 0;
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if (SCARG(uap, fileid) == 0) {
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if (TAILQ_FIRST(&files))
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p->p_retval[0] = TAILQ_FIRST(&files)->id;
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else
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p->p_retval[0] = 0;
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return 0;
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}
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lf = linker_find_file_by_id(SCARG(uap, fileid));
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if (lf) {
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if (TAILQ_NEXT(lf, link))
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p->p_retval[0] = TAILQ_NEXT(lf, link)->id;
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else
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p->p_retval[0] = 0;
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} else
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error = ENOENT;
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return error;
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}
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int
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kldstat(struct proc* p, struct kldstat_args* uap)
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{
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linker_file_t lf;
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int error = 0;
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int version;
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struct kld_file_stat* stat;
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int namelen;
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lf = linker_find_file_by_id(SCARG(uap, fileid));
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if (!lf) {
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error = ENOENT;
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goto out;
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}
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stat = SCARG(uap, stat);
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/*
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* Check the version of the user's structure.
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*/
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if (error = copyin(&stat->version, &version, sizeof(version)))
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goto out;
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if (version != sizeof(struct kld_file_stat)) {
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error = EINVAL;
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goto out;
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}
|
|
|
|
namelen = strlen(lf->filename) + 1;
|
|
if (namelen > MAXPATHLEN)
|
|
namelen = MAXPATHLEN;
|
|
if (error = copyout(lf->filename, &stat->name[0], namelen))
|
|
goto out;
|
|
if (error = copyout(&lf->refs, &stat->refs, sizeof(int)))
|
|
goto out;
|
|
if (error = copyout(&lf->id, &stat->id, sizeof(int)))
|
|
goto out;
|
|
if (error = copyout(&lf->address, &stat->address, sizeof(caddr_t)))
|
|
goto out;
|
|
if (error = copyout(&lf->size, &stat->size, sizeof(size_t)))
|
|
goto out;
|
|
|
|
p->p_retval[0] = 0;
|
|
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
int
|
|
kldfirstmod(struct proc* p, struct kldfirstmod_args* uap)
|
|
{
|
|
linker_file_t lf;
|
|
int error = 0;
|
|
|
|
lf = linker_find_file_by_id(SCARG(uap, fileid));
|
|
if (lf) {
|
|
if (TAILQ_FIRST(&lf->modules))
|
|
p->p_retval[0] = module_getid(TAILQ_FIRST(&lf->modules));
|
|
else
|
|
p->p_retval[0] = 0;
|
|
} else
|
|
error = ENOENT;
|
|
|
|
return error;
|
|
}
|