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
27#ifndef _MACHINE_DB_MACHDEP_H_
28#define _MACHINE_DB_MACHDEP_H_
29
30#include <machine/frame.h>
31#include <machine/trap.h>
32
33typedef vm_offset_t db_addr_t; /* address - unsigned */
34typedef int db_expr_t; /* expression - signed */
35
36#define PC_REGS() ((db_addr_t)(kdb_frame->tf_eflags & PSL_VM ? \
37 (kdb_frame->tf_eip & 0xffff) + \
38 ((kdb_frame->tf_cs & 0xffff) << 4) : \
39 kdb_frame->tf_eip))
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_eip += 1; \
48 kdb_thrctx->pcb_eip += 1; \
49} while(0)
50
51#define FIXUP_PC_AFTER_BREAK \
52do { \
53 kdb_frame->tf_eip -= 1; \
54 kdb_thrctx->pcb_eip -= 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_RET 0xc3
75#define I_IRET 0xcf
76
77#define inst_trap_return(ins) (((ins)&0xff) == I_IRET)
78#define inst_return(ins) (((ins)&0xff) == I_RET)
79#define inst_call(ins) (((ins)&0xff) == I_CALL || \
80 (((ins)&0xff) == I_CALLI && \
81 ((ins)&0x3800) == 0x1000))
82#define inst_load(ins) 0
83#define inst_store(ins) 0
84
85int db_segsize(struct trapframe *tfp);
86
87#endif /* !_MACHINE_DB_MACHDEP_H_ */