xref: /freebsd/sys/amd64/include/db_machdep.h (revision 62cfcf62f627e5093fb37026a6d8c98e4d2ef04c)
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 
36 typedef	vm_offset_t	db_addr_t;	/* address - unsigned */
37 typedef	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				\
46 do {						\
47 	kdb_frame->tf_rip += 1;			\
48 	kdb_thrctx->pcb_rip += 1;		\
49 } while(0)
50 
51 #define	FIXUP_PC_AFTER_BREAK			\
52 do {						\
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