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	long		db_expr_t;	/* expression - signed */
38
39#define	PC_REGS()	((db_addr_t)kdb_thrctx->pcb_rip)
40
41#define	BKPT_INST	0xcc		/* breakpoint instruction */
42#define	BKPT_SIZE	(1)		/* size of breakpoint inst */
43#define	BKPT_SET(inst)	(BKPT_INST)
44
45#define BKPT_SKIP				\
46do {						\
47	kdb_frame->tf_rip += 1;			\
48	kdb_thrctx->pcb_rip += 1;		\
49} while(0)
50
51#define	FIXUP_PC_AFTER_BREAK			\
52do {						\
53	kdb_frame->tf_rip -= 1;			\
54	kdb_thrctx->pcb_rip -= 1;		\
55} while(0);
56
57#define	db_clear_single_step	kdb_cpu_clear_singlestep
58#define	db_set_single_step	kdb_cpu_set_singlestep
59
60/*
61 * The debug exception type is copied from %dr6 to 'code' and used to
62 * disambiguate single step traps.  Watchpoints have no special support.
63 * Our hardware breakpoints are not well integrated with ddb and are too
64 * different from watchpoints.  ddb treats them as unknown traps with
65 * unknown addresses and doesn't turn them off while it is running.
66 */
67#define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BPTFLT)
68#define	IS_SSTEP_TRAP(type, code)					\
69	((type) == T_TRCTRAP && (code) & DBREG_DR6_BS)
70#define	IS_WATCHPOINT_TRAP(type, code)	0
71
72#define	I_CALL		0xe8
73#define	I_CALLI		0xff
74#define	i_calli(ins)	(((ins)&0xff) == I_CALLI && ((ins)&0x3800) == 0x1000)
75#define	I_RET		0xc3
76#define	I_IRET		0xcf
77#define	i_rex(ins)	(((ins) & 0xff) == 0x41 || ((ins) & 0xff) == 0x43)
78
79#define	inst_trap_return(ins)	(((ins)&0xff) == I_IRET)
80#define	inst_return(ins)	(((ins)&0xff) == I_RET)
81#define	inst_call(ins)		(((ins)&0xff) == I_CALL || i_calli(ins) || \
82				 (i_calli((ins) >> 8) && i_rex(ins)))
83#define inst_load(ins)		0
84#define inst_store(ins)		0
85
86#endif /* !_MACHINE_DB_MACHDEP_H_ */
87