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: releng/5.0/sys/i386/include/db_machdep.h 83506 2001-09-15 11:06:07Z dfr $
27 */
28
29 #ifndef _MACHINE_DB_MACHDEP_H_
30 #define _MACHINE_DB_MACHDEP_H_
31
32 #include <machine/frame.h>
33 #include <machine/psl.h>
34 #include <machine/trap.h>
35
36 #define i386_saved_state trapframe
37
38 typedef vm_offset_t db_addr_t; /* address - unsigned */
39 typedef int db_expr_t; /* expression - signed */
40
41 typedef struct i386_saved_state db_regs_t;
42 extern db_regs_t ddb_regs; /* register state */
43 #define DDB_REGS (&ddb_regs)
44
45 #define PC_REGS(regs) ((db_addr_t)(regs)->tf_eip)
46
47 #define BKPT_INST 0xcc /* breakpoint instruction */
48 #define BKPT_SIZE (1) /* size of breakpoint inst */
49 #define BKPT_SET(inst) (BKPT_INST)
50
51 #define BKPT_SKIP ddb_regs.tf_eip += 1
52
53 #define FIXUP_PC_AFTER_BREAK ddb_regs.tf_eip -= 1;
54
55 #define db_clear_single_step(regs) ((regs)->tf_eflags &= ~PSL_T)
56 #define db_set_single_step(regs) ((regs)->tf_eflags |= PSL_T)
57
58 #define IS_BREAKPOINT_TRAP(type, code) ((type) == T_BPTFLT)
59 /*
60 * Watchpoints are not supported. The debug exception type is in %dr6
61 * and not yet in the args to this macro.
62 */
63 #define IS_WATCHPOINT_TRAP(type, code) 0
64
65 #define I_CALL 0xe8
66 #define I_CALLI 0xff
67 #define I_RET 0xc3
68 #define I_IRET 0xcf
69
70 #define inst_trap_return(ins) (((ins)&0xff) == I_IRET)
71 #define inst_return(ins) (((ins)&0xff) == I_RET)
72 #define inst_call(ins) (((ins)&0xff) == I_CALL || \
73 (((ins)&0xff) == I_CALLI && \
74 ((ins)&0x3800) == 0x1000))
75 #define inst_load(ins) 0
76 #define inst_store(ins) 0
77
78 /*
79 * There no interesting addresses below _kstack = 0xefbfe000. There
80 * are small absolute values for GUPROF, but we don't want to see them.
81 * Treat "negative" addresses below _kstack as non-small to allow for
82 * future reductions of _kstack and to avoid sign extension problems.
83 *
84 * There is one interesting symbol above -db_maxoff = 0xffff0000,
85 * namely _APTD = 0xfffff000. Accepting this would mess up the
86 * printing of small negative offsets. The next largest symbol is
87 * _APTmap = 0xffc00000. Accepting this is OK (unless db_maxoff is
88 * set to >= 0x400000 - (max stack offset)).
89 */
90 #define DB_SMALL_VALUE_MAX 0x7fffffff
91 #define DB_SMALL_VALUE_MIN (-0x400001)
92
93 #endif /* !_MACHINE_DB_MACHDEP_H_ */
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