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/11.1/sys/i386/include/db_machdep.h 308418 2016-11-07 12:10:17Z kib $
27 */
28
29 #ifndef _MACHINE_DB_MACHDEP_H_
30 #define _MACHINE_DB_MACHDEP_H_
31
32 #include <machine/frame.h>
33 #include <machine/trap.h>
34
35 typedef vm_offset_t db_addr_t; /* address - unsigned */
36 typedef int db_expr_t; /* expression - signed */
37
38 #define PC_REGS() ((db_addr_t)(kdb_frame->tf_eflags & PSL_VM ? \
39 (kdb_frame->tf_eip & 0xffff) + \
40 ((kdb_frame->tf_cs & 0xffff) << 4) : \
41 kdb_frame->tf_eip))
42
43 #define BKPT_INST 0xcc /* breakpoint instruction */
44 #define BKPT_SIZE (1) /* size of breakpoint inst */
45 #define BKPT_SET(inst) (BKPT_INST)
46
47 #define BKPT_SKIP \
48 do { \
49 kdb_frame->tf_eip += 1; \
50 kdb_thrctx->pcb_eip += 1; \
51 } while(0)
52
53 #define FIXUP_PC_AFTER_BREAK \
54 do { \
55 kdb_frame->tf_eip -= 1; \
56 kdb_thrctx->pcb_eip -= 1; \
57 } while(0);
58
59 #define db_clear_single_step kdb_cpu_clear_singlestep
60 #define db_set_single_step kdb_cpu_set_singlestep
61
62 /*
63 * The debug exception type is copied from %dr6 to 'code' and used to
64 * disambiguate single step traps. Watchpoints have no special support.
65 * Our hardware breakpoints are not well integrated with ddb and are too
66 * different from watchpoints. ddb treats them as unknown traps with
67 * unknown addresses and doesn't turn them off while it is running.
68 */
69 #define IS_BREAKPOINT_TRAP(type, code) ((type) == T_BPTFLT)
70 #define IS_SSTEP_TRAP(type, code) ((type) == T_TRCTRAP && (code) & 0x4000)
71 #define IS_WATCHPOINT_TRAP(type, code) 0
72
73 #define I_CALL 0xe8
74 #define I_CALLI 0xff
75 #define I_RET 0xc3
76 #define I_IRET 0xcf
77
78 #define inst_trap_return(ins) (((ins)&0xff) == I_IRET)
79 #define inst_return(ins) (((ins)&0xff) == I_RET)
80 #define inst_call(ins) (((ins)&0xff) == I_CALL || \
81 (((ins)&0xff) == I_CALLI && \
82 ((ins)&0x3800) == 0x1000))
83 #define inst_load(ins) 0
84 #define inst_store(ins) 0
85
86 /*
87 * There no interesting addresses below _kstack = 0xefbfe000. There
88 * are small absolute values for GUPROF, but we don't want to see them.
89 * Treat "negative" addresses below _kstack as non-small to allow for
90 * future reductions of _kstack and to avoid sign extension problems.
91 *
92 * There is one interesting symbol above -db_maxoff = 0xffff0000,
93 * namely _APTD = 0xfffff000. Accepting this would mess up the
94 * printing of small negative offsets. The next largest symbol is
95 * _APTmap = 0xffc00000. Accepting this is OK (unless db_maxoff is
96 * set to >= 0x400000 - (max stack offset)).
97 */
98 #define DB_SMALL_VALUE_MAX 0x7fffffff
99 #define DB_SMALL_VALUE_MIN (-0x400001)
100
101 int db_segsize(struct trapframe *tfp);
102
103 #endif /* !_MACHINE_DB_MACHDEP_H_ */
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