If a panic occurs from a BIOS call (16 bit mode) or VM86 DDB will attempt
[dragonfly.git] / sys / cpu / i386 / include / db_machdep.h
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1/*
2 * Mach Operating System
3 * Copyright (c) 1991,1990 Carnegie Mellon University
4 * All Rights Reserved.
5 *
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
11 *
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
15 *
16 * Carnegie Mellon requests users of this software to return to
17 *
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
22 *
23 * any improvements or extensions that they make and grant Carnegie Mellon
24 * the rights to redistribute these changes.
25 *
26 * $FreeBSD: src/sys/i386/include/db_machdep.h,v 1.16 1999/10/04 13:55:35 marcel Exp $
55a2e6d4 27 * $DragonFly: src/sys/cpu/i386/include/db_machdep.h,v 1.5 2003/11/07 06:00:32 dillon Exp $
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28 */
29
30#ifndef _MACHINE_DB_MACHDEP_H_
31#define _MACHINE_DB_MACHDEP_H_
32
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33#include "frame.h"
34#include "psl.h"
35#include "trap.h"
36#include "globaldata.h"
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37
38#define i386_saved_state trapframe
39
40typedef vm_offset_t db_addr_t; /* address - unsigned */
41typedef int db_expr_t; /* expression - signed */
42
43typedef struct i386_saved_state db_regs_t;
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44
45#ifdef _KERNEL
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46extern db_regs_t ddb_regs; /* register state */
47#define DDB_REGS (&ddb_regs)
48
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49extern db_addr_t PC_REGS(db_regs_t *regs);
50extern db_addr_t SP_REGS(db_regs_t *regs);
51#endif
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52
53#define BKPT_INST 0xcc /* breakpoint instruction */
54#define BKPT_SIZE (1) /* size of breakpoint inst */
55#define BKPT_SET(inst) (BKPT_INST)
56
57#define FIXUP_PC_AFTER_BREAK ddb_regs.tf_eip -= 1;
58
59#define db_clear_single_step(regs) ((regs)->tf_eflags &= ~PSL_T)
60#define db_set_single_step(regs) ((regs)->tf_eflags |= PSL_T)
61
62#define IS_BREAKPOINT_TRAP(type, code) ((type) == T_BPTFLT)
63/*
64 * Watchpoints are not supported. The debug exception type is in %dr6
65 * and not yet in the args to this macro.
66 */
67#define IS_WATCHPOINT_TRAP(type, code) 0
68
69#define I_CALL 0xe8
70#define I_CALLI 0xff
71#define I_RET 0xc3
72#define I_IRET 0xcf
73
74#define inst_trap_return(ins) (((ins)&0xff) == I_IRET)
75#define inst_return(ins) (((ins)&0xff) == I_RET)
76#define inst_call(ins) (((ins)&0xff) == I_CALL || \
77 (((ins)&0xff) == I_CALLI && \
78 ((ins)&0x3800) == 0x1000))
79#define inst_load(ins) 0
80#define inst_store(ins) 0
81
82/*
83 * There no interesting addresses below _kstack = 0xefbfe000. There
84 * are small absolute values for GUPROF, but we don't want to see them.
85 * Treat "negative" addresses below _kstack as non-small to allow for
86 * future reductions of _kstack and to avoid sign extension problems.
87 *
88 * There is one interesting symbol above -db_maxoff = 0xffff0000,
89 * namely _APTD = 0xfffff000. Accepting this would mess up the
90 * printing of small negative offsets. The next largest symbol is
91 * _APTmap = 0xffc00000. Accepting this is OK (unless db_maxoff is
92 * set to >= 0x400000 - (max stack offset)).
93 */
94#define DB_SMALL_VALUE_MAX 0x7fffffff
95#define DB_SMALL_VALUE_MIN (-0x400001)
96
97#endif /* !_MACHINE_DB_MACHDEP_H_ */