1 /* $OpenBSD: trap.h,v 1.1 2004/02/01 05:09:49 drahn Exp $ */ 2 /* $NetBSD: trap.h,v 1.4 2003/04/28 01:54:50 briggs Exp $ */ 3 4 /* 5 * Copyright (c) 1995 Mark Brinicombe. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Mark Brinicombe. 19 * 4. The name of the company nor the name of the author may be used to 20 * endorse or promote products derived from this software without specific 21 * prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * RiscBSD kernel project 36 * 37 * trap.h 38 * 39 * Various trap definitions 40 */ 41 42 /* 43 * Instructions used for breakpoints. 44 * 45 * These are undefined instructions. 46 * Technically the userspace breakpoint could be a SWI but we want to 47 * keep this the same as IPKDB which needs an undefined instruction as 48 * a break point. 49 * 50 * Ideally ARM would define several standard instruction sequences for 51 * use as breakpoints. 52 * 53 * The BKPT instruction isn't much use to us, since its behaviour is 54 * unpredictable on ARMv3 and lower. 55 * 56 * The ARM ARM says that for maximum compatibility, we should use undefined 57 * instructions that look like 0x.7f...f. . 58 */ 59 60 #define GDB_BREAKPOINT 0xe6000011 /* Used by GDB 4.x */ 61 #define IPKDB_BREAKPOINT 0xe6000010 /* Used by IPKDB */ 62 #define GDB5_BREAKPOINT 0xe7ffdefe /* Used by GDB 5.0 */ 63 #define KERNEL_BREAKPOINT 0xe7ffffff /* Used by DDB */ 64 65 #define KBPT_ASM ".word 0xe7ffdefe" 66 67 #define USER_BREAKPOINT GDB_BREAKPOINT 68 69 #define T_FAULT 1 70 71 /* End of trap.h */ 72