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trap.h revision 1.5 
      1 /*	$NetBSD: trap.h,v 1.5 2003/05/21 13:39:01 briggs Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1995 Mark Brinicombe.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by Mark Brinicombe.
     18  * 4. The name of the company nor the name of the author may be used to
     19  *    endorse or promote products derived from this software without specific
     20  *    prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     23  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     24  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
     26  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     27  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     28  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  * RiscBSD kernel project
     35  *
     36  * trap.h
     37  *
     38  * Various trap definitions
     39  */
     40 
     41 /*
     42  * Instructions used for breakpoints.
     43  *
     44  * These are undefined instructions.
     45  * Technically the userspace breakpoint could be a SWI but we want to
     46  * keep this the same as IPKDB which needs an undefined instruction as
     47  * a break point.
     48  *
     49  * Ideally ARM would define several standard instruction sequences for
     50  * use as breakpoints.
     51  *
     52  * The BKPT instruction isn't much use to us, since its behaviour is
     53  * unpredictable on ARMv3 and lower.
     54  *
     55  * The ARM ARM says that for maximum compatibility, we should use undefined
     56  * instructions that look like 0x.7f...f. .
     57  */
     58 
     59 #define GDB_BREAKPOINT		0xe6000011	/* Used by GDB 4.x */
     60 #define IPKDB_BREAKPOINT	0xe6000010	/* Used by IPKDB */
     61 #define GDB5_BREAKPOINT		0xe7ffdefe	/* Used by GDB 5.0 */
     62 #define KERNEL_BREAKPOINT	0xe7ffffff	/* Used by DDB */
     63 
     64 #define KBPT_ASM		".word 0xe7ffdefe"
     65 
     66 #define USER_BREAKPOINT		GDB_BREAKPOINT
     67 
     68 /* End of trap.h */
     69