sys/arch/arm/include/trap.h

   1 /*      $NetBSD: trap.h,v 1.7 2005/12/11 12:16:47 christos 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_DEAD   0xe6000010      /* was used by IPKDB */
  61 #define GDB5_BREAKPOINT         0xe7ffdefe      /* Used by GDB 5.0 */
  62 #define GDB_THUMB_BREAKPOINT    0xdefe          /* Thumb in GDB */
  63 #define KERNEL_BREAKPOINT       0xe7ffffff      /* Used by DDB */
  64
  65 #define KBPT_ASM                ".word 0xe7ffdefe"
  66
  67 #define USER_BREAKPOINT         GDB_BREAKPOINT
  68
  69 /* End of trap.h */