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db_machdep.h revision 1.3 
      1 /*	$NetBSD: db_machdep.h,v 1.3 1997/02/06 21:17:05 gwr Exp $	*/
      2 
      3 /*
      4  * Mach Operating System
      5  * Copyright (c) 1991,1990 Carnegie Mellon University
      6  * All Rights Reserved.
      7  *
      8  * Permission to use, copy, modify and distribute this software and its
      9  * documentation is hereby granted, provided that both the copyright
     10  * notice and this permission notice appear in all copies of the
     11  * software, derivative works or modified versions, and any portions
     12  * thereof, and that both notices appear in supporting documentation.
     13  *
     14  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     15  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     16  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     17  *
     18  * Carnegie Mellon requests users of this software to return to
     19  *
     20  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     21  *  School of Computer Science
     22  *  Carnegie Mellon University
     23  *  Pittsburgh PA 15213-3890
     24  *
     25  * any improvements or extensions that they make and grant Carnegie Mellon
     26  * the rights to redistribute these changes.
     27  */
     28 
     29 #ifndef	_VAX_DB_MACHDEP_H_
     30 #define	_VAX_DB_MACHDEP_H_
     31 
     32 /*
     33  * Machine-dependent defines for new kernel debugger.
     34  * Modified for vax out of i386 code.
     35  */
     36 
     37 #include <sys/param.h>
     38 #include <vm/vm.h>
     39 #include <machine/trap.h>
     40 
     41 typedef	vm_offset_t	db_addr_t;	/* address - unsigned */
     42 typedef	int		db_expr_t;	/* expression - signed */
     43 
     44 typedef struct trapframe db_regs_t;
     45 db_regs_t	ddb_regs;	/* register state */
     46 #define	DDB_REGS	(&ddb_regs)
     47 
     48 #define	PC_REGS(regs)	((db_addr_t)(regs)->pc)
     49 
     50 #define	BKPT_INST	0x03		/* breakpoint instruction */
     51 #define	BKPT_SIZE	(1)		/* size of breakpoint inst */
     52 #define	BKPT_SET(inst)	(BKPT_INST)
     53 
     54 #define	FIXUP_PC_AFTER_BREAK(regs)	((regs)->pc -= BKPT_SIZE)
     55 
     56 #define	db_clear_single_step(regs)	((regs)->psl &= ~PSL_T)
     57 #define	db_set_single_step(regs)	((regs)->psl |=  PSL_T)
     58 
     59 #define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BPTFLT)
     60 #define IS_WATCHPOINT_TRAP(type, code)	((type) == T_TRCTRAP)
     61 
     62 #define	I_CALL		0xfb
     63 #define	I_RET		0x04
     64 #define	I_IRET		0x02
     65 
     66 #define	inst_trap_return(ins)	(((ins)&0xff) == I_IRET)
     67 #define	inst_return(ins)	(((ins)&0xff) == I_RET)
     68 #define	inst_call(ins)		(((ins)&0xff) == I_CALL)
     69 
     70 #define inst_load(ins)		0
     71 #define inst_store(ins)		0
     72 
     73 /* Prototypes */
     74 void	kdb_trap __P((struct trapframe *));
     75 #endif	/* _VAX_DB_MACHDEP_H_ */
     76