e48f8429d1
of transitions to IPL_HIGH from lower IPLs. SPLDEBUG is only available on i386 and Xen kernels, today. 'options SPLDEBUG' adds instrumentation to spllower() and splraise() as well as routines to start/stop debugging and to record IPL transitions: spldebug_start(), spldebug_stop(), spldebug_raise(), spldebug_lower().
135 lines
3.3 KiB
C
135 lines
3.3 KiB
C
/* $NetBSD: subr_spldebug.c,v 1.1 2009/11/03 05:23:28 dyoung Exp $ */
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/*-
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* Copyright (c) 2009 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 1.1 2009/11/03 05:23:28 dyoung 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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__strong_alias(spldebug_start, _spldebug_start);
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__strong_alias(spldebug_stop, _spldebug_stop);
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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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struct cpu_info *ci;
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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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if (cold)
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ci = &cpu_info_primary;
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else
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ci = curcpu();
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if (cpu_index(ci) > MAXCPUS)
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return;
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splraise_depth[cpu_index(ci)] = 0;
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spllowered_to[cpu_index(ci)] = ipl;
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#if 0
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spllowered_from[cpu_index(ci)][0] = return_address(0);
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spllowered_from[cpu_index(ci)][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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void **retaddrs;
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struct cpu_info *ci;
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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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if (cold)
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ci = &cpu_info_primary;
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else
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ci = curcpu();
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if (cpu_index(ci) >= MAXCPUS)
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return;
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if (splraise_depth[cpu_index(ci)] >= SPLRAISE_STACKLEN)
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return;
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retaddrs = &splraise_retaddrs[cpu_index(ci)]
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[splraise_depth[cpu_index(ci)]++][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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