290245ea4c
to get a stacktrace. This does not work even with M_NOWAIT when we have WITNESS and is generally a bad idea (pointed out by bde@). We allocate an 8K heap for use by the unwinder when ddb is active. A stack trace roughly takes up half of that in any case, so we have some room for complex unwind situations. We don't want to waste too much space though. Due to the nature of unwinding, we don't worry too much about fragmentation or performance of unwinding while in the debugger. For now we have our own heap management, but we may be able to leverage from existing code at some later time. While here: o Make sure we actually free the unwind environment after unwinding. This fixes a memory leak. o Replace Doug's license with mine in unwind.c and unwind.h. Both files don't have much, if any, of Doug's code left since the EPC syscall overhaul and the import of the unwinder. o Remove dead code. o Replace M_NOWAIT with M_WAITOK for all remaining malloc() calls.
52 lines
1.9 KiB
C
52 lines
1.9 KiB
C
/*
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* Copyright (c) 2003 Marcel Moolenaar
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* All rights reserved.
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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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*
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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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_UNWIND_H_
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#define _MACHINE_UNWIND_H_
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struct uwx_env;
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struct unw_regstate {
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struct trapframe *frame;
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struct uwx_env *env;
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uint64_t keyval[8];
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};
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int unw_create(struct unw_regstate *s, struct trapframe *tf);
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void unw_delete(struct unw_regstate *s);
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int unw_step(struct unw_regstate *s);
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int unw_get_bsp(struct unw_regstate *s, uint64_t *r);
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int unw_get_cfm(struct unw_regstate *s, uint64_t *r);
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int unw_get_ip(struct unw_regstate *s, uint64_t *r);
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int unw_table_add(uint64_t, uint64_t, uint64_t);
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void unw_table_remove(uint64_t);
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#endif /* _MACHINE_UNWIND_H_ */
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