| 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 */ |