123 lines
3.0 KiB
C
123 lines
3.0 KiB
C
/* $NetBSD: subr_spldebug.c,v 1.3 2010/04/25 11:49:22 ad Exp $ */
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/*-
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* Copyright (c) 2009, 2010 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by David Young.
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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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/*
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* Interrupt priority level debugging code.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: subr_spldebug.c,v 1.3 2010/04/25 11:49:22 ad Exp $");
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#include <sys/param.h>
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#include <sys/spldebug.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/cpu.h>
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#include <machine/return.h>
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#define SPLRAISE_STACKLEN 32
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void *splraise_retaddrs[MAXCPUS][SPLRAISE_STACKLEN][4];
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int splraise_depth[MAXCPUS] = {0};
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int spllowered_to[MAXCPUS] = {0};
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void *spllowered_from[MAXCPUS][2] = {{0}};
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bool spldebug = false;
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void spldebug_start(void);
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void spldebug_stop(void);
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void
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spldebug_start(void)
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{
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spldebug = true;
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}
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void
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spldebug_stop(void)
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{
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spldebug = false;
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}
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void
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spldebug_lower(int ipl)
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{
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u_int cidx;
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if (!spldebug)
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return;
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if (ipl == IPL_HIGH)
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return;
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cidx = cpu_index(curcpu());
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KASSERT(cidx < maxcpus);
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splraise_depth[cidx] = 0;
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spllowered_to[cidx] = ipl;
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#if 0
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spllowered_from[cidx][0] = return_address(0);
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spllowered_from[cidx][1] = return_address(1);
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#endif
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}
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void
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spldebug_raise(int ipl)
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{
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int i;
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u_int cidx;
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void **retaddrs;
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if (!spldebug)
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return;
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if (ipl != IPL_HIGH)
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return;
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cidx = cpu_index(curcpu());
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KASSERT(cidx < maxcpus);
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if (splraise_depth[cidx] >= SPLRAISE_STACKLEN)
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return;
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retaddrs = &splraise_retaddrs[cidx][splraise_depth[cidx]++][0];
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retaddrs[0] = retaddrs[1] = retaddrs[2] = retaddrs[3] = NULL;
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for (i = 0; i < 4; i++) {
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retaddrs[i] = return_address(i);
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if (retaddrs[i] == NULL)
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break;
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}
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}
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