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db_lwp.c revision 1.2 
      1 /*	$NetBSD: db_lwp.c,v 1.2 2009/03/08 11:40:00 mrg Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2009 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Andrew Doran.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: db_lwp.c,v 1.2 2009/03/08 11:40:00 mrg Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/cpu.h>
     37 #include <sys/proc.h>
     38 
     39 #include <ddb/ddb.h>
     40 
     41 lwp_t *
     42 db_lwp_first(void)
     43 {
     44 
     45 	return db_read_ptr("alllwp");
     46 }
     47 
     48 lwp_t *
     49 db_lwp_next(lwp_t *l)
     50 {
     51 
     52 	db_read_bytes((db_addr_t)&l->l_list.le_next, sizeof(l), (char *)&l);
     53 	return l;
     54 }
     55 
     56 void
     57 db_lwp_whatis(uintptr_t addr, void (*pr)(const char *, ...))
     58 {
     59 	uintptr_t stack;
     60 	lwp_t l, *lp;
     61 
     62 	for (lp = db_lwp_first(); lp != NULL; lp = db_lwp_next(lp)) {
     63 		db_read_bytes((db_addr_t)lp, sizeof(l), (char *)&l);
     64 		stack = (uintptr_t)KSTACK_LOWEST_ADDR((&l));
     65 		if (addr < stack || stack + KSTACK_SIZE <= addr) {
     66 			continue;
     67 		}
     68 		(*pr)("%p is %p+%zu, LWP %p's stack\n",
     69 		    (void *)addr, (void *)stack,
     70 		    (size_t)(addr - stack), lp);
     71 	}
     72 }
     73