1 /* $NetBSD: trap.h,v 1.10 2020/12/01 02:48:29 rin 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 #include <arm/cdefs.h> 42 43 /* 44 * Instructions used for breakpoints. 45 * 46 * These are undefined instructions. 47 * Technically the userspace breakpoint could be a SWI but we want to 48 * keep this the same as IPKDB which needs an undefined instruction as 49 * a break point. 50 * 51 * Ideally ARM would define several standard instruction sequences for 52 * use as breakpoints. 53 * 54 * The BKPT instruction isn't much use to us, since its behaviour is 55 * unpredictable on ARMv3 and lower. 56 * 57 * The ARM ARM says that for maximum compatibility, we should use undefined 58 * instructions that look like 0x.7f...f. . 59 */ 60 61 #define GDB_BREAKPOINT 0xe6000011 /* Used by GDB 4.x */ 62 #define IPKDB_BREAKPOINT_DEAD 0xe6000010 /* was used by IPKDB */ 63 #define GDB5_BREAKPOINT 0xe7ffdefe /* Used by GDB 5.0 */ 64 #define GDB_THUMB_BREAKPOINT 0xdefe /* Thumb in GDB */ 65 #define KERNEL_BREAKPOINT 0xe7ffffff /* Used by DDB */ 66 67 /* 68 * DTrace uses 0xe7fffef0 to 0xe7fffeff as breakpoints. 69 * The first byte is used to encode a cond value. 70 */ 71 #define DTRACE_BREAKPOINT 0xe7fffef0 72 #define DTRACE_BREAKPOINT_MASK 0xfffffff0 73 #define DTRACE_IS_BREAKPOINT(insn) ((insn & DTRACE_BREAKPOINT_MASK) == DTRACE_BREAKPOINT) 74 75 #ifdef _ARM_ARCH_BE8 76 #define KBPT_ASM ".word 0xfedeffe7" 77 #else 78 #define KBPT_ASM ".word 0xe7ffdefe" 79 #endif 80 81 #define USER_BREAKPOINT GDB_BREAKPOINT 82 83 /* End of trap.h */ 84