subr_spldebug.c

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    1 /*      $NetBSD: subr_spldebug.c,v 1.3 2010/04/25 11:49:22 ad Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 2009, 2010 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by David Young.
    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 /*
   33  * Interrupt priority level debugging code.
   34  */
   35 
   36 #include <sys/cdefs.h>
   37 __KERNEL_RCSID(0, "$NetBSD: subr_spldebug.c,v 1.3 2010/04/25 11:49:22 ad Exp $");
   38 
   39 #include <sys/param.h>
   40 #include <sys/spldebug.h>
   41 #include <sys/systm.h>
   42 #include <sys/kernel.h>
   43 #include <sys/cpu.h>
   44 #include <machine/return.h>
   45 
   46 #define SPLRAISE_STACKLEN 32
   47 
   48 void *splraise_retaddrs[MAXCPUS][SPLRAISE_STACKLEN][4];
   49 int splraise_depth[MAXCPUS] = {0};
   50 int spllowered_to[MAXCPUS] = {0};
   51 void *spllowered_from[MAXCPUS][2] = {{0}};
   52 bool spldebug = false;
   53 
   54 void    spldebug_start(void);
   55 void    spldebug_stop(void);
   56 
   57 void
   58 spldebug_start(void)
   59 {
   60         spldebug = true;
   61 }
   62 
   63 void
   64 spldebug_stop(void)
   65 {
   66         spldebug = false;
   67 }
   68 
   69 void
   70 spldebug_lower(int ipl)
   71 {
   72         u_int cidx;
   73 
   74         if (!spldebug)
   75                 return;
   76 
   77         if (ipl == IPL_HIGH)
   78                 return;
   79 
   80         cidx = cpu_index(curcpu());
   81 
   82         KASSERT(cidx < maxcpus);
   83 
   84         splraise_depth[cidx] = 0;
   85         spllowered_to[cidx] = ipl;
   86 #if 0
   87         spllowered_from[cidx][0] = return_address(0);
   88         spllowered_from[cidx][1] = return_address(1);
   89 #endif
   90 }
   91 
   92 void
   93 spldebug_raise(int ipl)
   94 {
   95         int i;
   96         u_int cidx;
   97         void **retaddrs;
   98 
   99         if (!spldebug)
  100                 return;
  101 
  102         if (ipl != IPL_HIGH)
  103                 return;
  104 
  105         cidx = cpu_index(curcpu());
  106 
  107         KASSERT(cidx < maxcpus);
  108 
  109         if (splraise_depth[cidx] >= SPLRAISE_STACKLEN)
  110                 return;
  111 
  112         retaddrs = &splraise_retaddrs[cidx][splraise_depth[cidx]++][0];
  113 
  114         retaddrs[0] = retaddrs[1] = retaddrs[2] = retaddrs[3] = NULL;
  115 
  116         for (i = 0; i < 4; i++) {
  117                 retaddrs[i] = return_address(i);
  118 
  119                 if (retaddrs[i] == NULL)
  120                         break;
  121         }
  122 }

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FreeBSD/Linux Kernel Cross Reference sys/kern/subr_spldebug.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_spldebug.c