74 lines
2.5 KiB
C
74 lines
2.5 KiB
C
/* $NetBSD: db_syncobj.c,v 1.3 2023/10/15 10:27:25 riastradh Exp $ */
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/*-
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* Copyright (c) 2023 The NetBSD Foundation, Inc.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#define __MUTEX_PRIVATE
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#define __RWLOCK_PRIVATE
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: db_syncobj.c,v 1.3 2023/10/15 10:27:25 riastradh Exp $");
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#include <sys/types.h>
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#include <sys/mutex.h>
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#include <sys/null.h>
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#include <sys/rwlock.h>
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#include <sys/syncobj.h>
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#include <ddb/ddb.h>
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struct lwp *
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db_syncobj_owner(const struct syncobj *sobj, wchan_t wchan)
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{
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db_expr_t mutex_syncobj_;
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db_expr_t rw_syncobj_;
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if (db_value_of_name("mutex_syncobj", &mutex_syncobj_) &&
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(db_expr_t)(uintptr_t)sobj == mutex_syncobj_) {
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volatile const struct kmutex *mtx = wchan;
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uintptr_t owner;
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db_read_bytes((db_addr_t)&mtx->mtx_owner, sizeof(owner),
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(char *)&owner);
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return (struct lwp *)(owner & MUTEX_THREAD);
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} else if (db_value_of_name("rw_syncobj", &rw_syncobj_) &&
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(db_expr_t)(uintptr_t)sobj == rw_syncobj_) {
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volatile const struct krwlock *rw = wchan;
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uintptr_t owner;
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db_read_bytes((db_addr_t)&rw->rw_owner, sizeof(owner),
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(char *)&owner);
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if (owner & RW_WRITE_LOCKED)
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return (struct lwp *)(owner & RW_THREAD);
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return NULL;
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} else {
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return NULL;
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}
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}
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