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 * $FreeBSD$
27 */
28
29#ifndef _MACHINE_DB_MACHDEP_H_
30#define	_MACHINE_DB_MACHDEP_H_
31
32#include <machine/frame.h>
33#include <machine/reg.h>
34#include <machine/trap.h>
35
36typedef	vm_offset_t	db_addr_t;	/* address - unsigned */
37typedef	int		db_expr_t;	/* expression - signed */
38
39#define	PC_REGS()	((db_addr_t)(kdb_frame->tf_eflags & PSL_VM ?	\
40			    (kdb_frame->tf_eip & 0xffff) +		\
41			    ((kdb_frame->tf_cs & 0xffff) << 4) :	\
42			    kdb_frame->tf_eip))
43
44#define	BKPT_INST	0xcc		/* breakpoint instruction */
45#define	BKPT_SIZE	(1)		/* size of breakpoint inst */
46#define	BKPT_SET(inst)	(BKPT_INST)
47
48#define BKPT_SKIP				\
49do {						\
50	kdb_frame->tf_eip += 1;			\
51	kdb_thrctx->pcb_eip += 1;		\
52} while(0)
53
54#define	FIXUP_PC_AFTER_BREAK			\
55do {						\
56	kdb_frame->tf_eip -= 1;			\
57	kdb_thrctx->pcb_eip -= 1;		\
58} while(0);
59
60#define	db_clear_single_step	kdb_cpu_clear_singlestep
61#define	db_set_single_step	kdb_cpu_set_singlestep
62
63/*
64 * The debug exception type is copied from %dr6 to 'code' and used to
65 * disambiguate single step traps.  Watchpoints have no special support.
66 * Our hardware breakpoints are not well integrated with ddb and are too
67 * different from watchpoints.  ddb treats them as unknown traps with
68 * unknown addresses and doesn't turn them off while it is running.
69 */
70#define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BPTFLT)
71#define	IS_SSTEP_TRAP(type, code)					\
72	((type) == T_TRCTRAP && (code) & DBREG_DR6_BS)
73#define	IS_WATCHPOINT_TRAP(type, code)	0
74
75#define	I_CALL		0xe8
76#define	I_CALLI		0xff
77#define	I_RET		0xc3
78#define	I_IRET		0xcf
79
80#define	inst_trap_return(ins)	(((ins)&0xff) == I_IRET)
81#define	inst_return(ins)	(((ins)&0xff) == I_RET)
82#define	inst_call(ins)		(((ins)&0xff) == I_CALL || \
83				 (((ins)&0xff) == I_CALLI && \
84				  ((ins)&0x3800) == 0x1000))
85#define inst_load(ins)		0
86#define inst_store(ins)		0
87
88int	db_segsize(struct trapframe *tfp);
89
90#endif /* !_MACHINE_DB_MACHDEP_H_ */
91