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subr_spldebug.c revision 1.2.4.3 
      1  1.2.4.3  yamt /*	$NetBSD: subr_spldebug.c,v 1.2.4.3 2010/08/11 22:54:42 yamt Exp $	*/
      2  1.2.4.2  yamt 
      3  1.2.4.2  yamt /*-
      4  1.2.4.3  yamt  * Copyright (c) 2009, 2010 The NetBSD Foundation, Inc.
      5  1.2.4.2  yamt  * All rights reserved.
      6  1.2.4.2  yamt  *
      7  1.2.4.2  yamt  * This code is derived from software contributed to The NetBSD Foundation
      8  1.2.4.2  yamt  * by David Young.
      9  1.2.4.2  yamt  *
     10  1.2.4.2  yamt  * Redistribution and use in source and binary forms, with or without
     11  1.2.4.2  yamt  * modification, are permitted provided that the following conditions
     12  1.2.4.2  yamt  * are met:
     13  1.2.4.2  yamt  * 1. Redistributions of source code must retain the above copyright
     14  1.2.4.2  yamt  *    notice, this list of conditions and the following disclaimer.
     15  1.2.4.2  yamt  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.2.4.2  yamt  *    notice, this list of conditions and the following disclaimer in the
     17  1.2.4.2  yamt  *    documentation and/or other materials provided with the distribution.
     18  1.2.4.2  yamt  *
     19  1.2.4.2  yamt  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  1.2.4.2  yamt  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  1.2.4.2  yamt  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  1.2.4.2  yamt  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  1.2.4.2  yamt  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  1.2.4.2  yamt  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  1.2.4.2  yamt  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  1.2.4.2  yamt  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  1.2.4.2  yamt  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  1.2.4.2  yamt  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  1.2.4.2  yamt  * POSSIBILITY OF SUCH DAMAGE.
     30  1.2.4.2  yamt  */
     31  1.2.4.2  yamt 
     32  1.2.4.2  yamt /*
     33  1.2.4.2  yamt  * Interrupt priority level debugging code.
     34  1.2.4.2  yamt  */
     35  1.2.4.2  yamt 
     36  1.2.4.2  yamt #include <sys/cdefs.h>
     37  1.2.4.3  yamt __KERNEL_RCSID(0, "$NetBSD: subr_spldebug.c,v 1.2.4.3 2010/08/11 22:54:42 yamt Exp $");
     38  1.2.4.2  yamt 
     39  1.2.4.2  yamt #include <sys/param.h>
     40  1.2.4.2  yamt #include <sys/spldebug.h>
     41  1.2.4.2  yamt #include <sys/systm.h>
     42  1.2.4.2  yamt #include <sys/kernel.h>
     43  1.2.4.2  yamt #include <sys/cpu.h>
     44  1.2.4.2  yamt #include <machine/return.h>
     45  1.2.4.2  yamt 
     46  1.2.4.2  yamt #define SPLRAISE_STACKLEN 32
     47  1.2.4.2  yamt 
     48  1.2.4.2  yamt void *splraise_retaddrs[MAXCPUS][SPLRAISE_STACKLEN][4];
     49  1.2.4.2  yamt int splraise_depth[MAXCPUS] = {0};
     50  1.2.4.2  yamt int spllowered_to[MAXCPUS] = {0};
     51  1.2.4.2  yamt void *spllowered_from[MAXCPUS][2] = {{0}};
     52  1.2.4.2  yamt bool spldebug = false;
     53  1.2.4.2  yamt 
     54  1.2.4.2  yamt void	spldebug_start(void);
     55  1.2.4.2  yamt void	spldebug_stop(void);
     56  1.2.4.2  yamt 
     57  1.2.4.2  yamt void
     58  1.2.4.2  yamt spldebug_start(void)
     59  1.2.4.2  yamt {
     60  1.2.4.2  yamt 	spldebug = true;
     61  1.2.4.2  yamt }
     62  1.2.4.2  yamt 
     63  1.2.4.2  yamt void
     64  1.2.4.2  yamt spldebug_stop(void)
     65  1.2.4.2  yamt {
     66  1.2.4.2  yamt 	spldebug = false;
     67  1.2.4.2  yamt }
     68  1.2.4.2  yamt 
     69  1.2.4.2  yamt void
     70  1.2.4.2  yamt spldebug_lower(int ipl)
     71  1.2.4.2  yamt {
     72  1.2.4.2  yamt 	u_int cidx;
     73  1.2.4.2  yamt 
     74  1.2.4.2  yamt 	if (!spldebug)
     75  1.2.4.2  yamt 		return;
     76  1.2.4.2  yamt 
     77  1.2.4.2  yamt 	if (ipl == IPL_HIGH)
     78  1.2.4.2  yamt 		return;
     79  1.2.4.2  yamt 
     80  1.2.4.2  yamt 	cidx = cpu_index(curcpu());
     81  1.2.4.2  yamt 
     82  1.2.4.3  yamt 	KASSERT(cidx < maxcpus);
     83  1.2.4.2  yamt 
     84  1.2.4.2  yamt 	splraise_depth[cidx] = 0;
     85  1.2.4.2  yamt 	spllowered_to[cidx] = ipl;
     86  1.2.4.2  yamt #if 0
     87  1.2.4.2  yamt 	spllowered_from[cidx][0] = return_address(0);
     88  1.2.4.2  yamt 	spllowered_from[cidx][1] = return_address(1);
     89  1.2.4.2  yamt #endif
     90  1.2.4.2  yamt }
     91  1.2.4.2  yamt 
     92  1.2.4.2  yamt void
     93  1.2.4.2  yamt spldebug_raise(int ipl)
     94  1.2.4.2  yamt {
     95  1.2.4.2  yamt 	int i;
     96  1.2.4.2  yamt 	u_int cidx;
     97  1.2.4.2  yamt 	void **retaddrs;
     98  1.2.4.2  yamt 
     99  1.2.4.2  yamt 	if (!spldebug)
    100  1.2.4.2  yamt 		return;
    101  1.2.4.2  yamt 
    102  1.2.4.2  yamt 	if (ipl != IPL_HIGH)
    103  1.2.4.2  yamt 		return;
    104  1.2.4.2  yamt 
    105  1.2.4.2  yamt 	cidx = cpu_index(curcpu());
    106  1.2.4.2  yamt 
    107  1.2.4.3  yamt 	KASSERT(cidx < maxcpus);
    108  1.2.4.2  yamt 
    109  1.2.4.2  yamt 	if (splraise_depth[cidx] >= SPLRAISE_STACKLEN)
    110  1.2.4.2  yamt 		return;
    111  1.2.4.2  yamt 
    112  1.2.4.2  yamt 	retaddrs = &splraise_retaddrs[cidx][splraise_depth[cidx]++][0];
    113  1.2.4.2  yamt 
    114  1.2.4.2  yamt 	retaddrs[0] = retaddrs[1] = retaddrs[2] = retaddrs[3] = NULL;
    115  1.2.4.2  yamt 
    116  1.2.4.2  yamt 	for (i = 0; i < 4; i++) {
    117  1.2.4.2  yamt 		retaddrs[i] = return_address(i);
    118  1.2.4.2  yamt 
    119  1.2.4.2  yamt 		if (retaddrs[i] == NULL)
    120  1.2.4.2  yamt 			break;
    121  1.2.4.2  yamt 	}
    122  1.2.4.2  yamt }
    123