trap.h revision 1.9 
1/*	$NetBSD: trap.h,v 1.9 2014/03/15 05:54:20 ozaki-r 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/*
66 * DTrace uses 0xe7fffef0 to 0xe7fffeff as breakpoints.
67 * The first byte is used to encode a cond value.
68 */
69#define DTRACE_BREAKPOINT	0xe7fffef0
70#define DTRACE_BREAKPOINT_MASK	0xfffffff0
71#define DTRACE_IS_BREAKPOINT(insn)	((insn & DTRACE_BREAKPOINT_MASK) == DTRACE_BREAKPOINT)
72
73#define KBPT_ASM		".word 0xe7ffdefe"
74
75#define USER_BREAKPOINT		GDB_BREAKPOINT
76
77/* End of trap.h */
78