d3d2d8bdd7
the instruction we used with GDB 4.x. The new instruction has the advantage of fitting the pattern that ARM recommend using for instructions that need to stay undefined.
65 lines
2.6 KiB
C
65 lines
2.6 KiB
C
/* $NetBSD: trap.h,v 1.3 2001/10/18 21:26:23 bjh21 Exp $ */
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/*
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* Copyright (c) 1995 Mark Brinicombe.
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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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* 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Mark Brinicombe.
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* 4. The name of the company nor the name of the author may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* RiscBSD kernel project
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*
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* trap.h
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*
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* Various trap definitions
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*/
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/*
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* Instructions used for breakpoints.
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*
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* These are an undefined instructions.
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* Technically the userspace breakpoint could be a SWI
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* but we want to keep this the same as IPKDB which
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* needs an undefined instruction as a break point.
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* Ideally ARM would define several standard instruction
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* sequences for use as breakpoints.
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* The BKPT instruction isn't much use to us, since its
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* behaviour is unpredictable on ARMv3 and lower.
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*
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* The ARM ARM says that for maximum compatibility, we should use undefined
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* instructions that look like 0x.7f...f. .
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*/
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#define GDB_BREAKPOINT 0xe6000011 /* Used by GDB 4.x */
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#define IPKDB_BREAKPOINT 0xe6000010 /* Used by IPKDB */
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#define GDB5_BREAKPOINT 0xe7ffdefe /* Used by GDB 5.0 */
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#define KERNEL_BREAKPOINT 0xe7ffffff /* Used by DDB */
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#define USER_BREAKPOINT GDB_BREAKPOINT
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/* End of trap.h */
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