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db_machdep.h revision 1.18 
      1 /*	$NetBSD: db_machdep.h,v 1.18 1997/02/12 00:59:46 gwr Exp $	*/
      2 
      3 /*
      4  * Mach Operating System
      5  * Copyright (c) 1992 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 /*
     30  * Machine-dependent defines for new kernel debugger.
     31  */
     32 #ifndef	_M68K_DB_MACHDEP_H_
     33 #define	_M68K_DB_MACHDEP_H_
     34 
     35 #include <vm/vm_prot.h>
     36 #include <vm/vm_param.h>
     37 #include <vm/vm_inherit.h>
     38 #include <vm/lock.h>
     39 
     40 #include <machine/frame.h>
     41 #include <machine/psl.h>
     42 #include <machine/trap.h>
     43 
     44 typedef	vm_offset_t	db_addr_t;	/* address - unsigned */
     45 typedef	long		db_expr_t;	/* expression - signed */
     46 typedef struct trapframe db_regs_t;
     47 
     48 db_regs_t	ddb_regs;		/* register state */
     49 #define DDB_REGS	(&ddb_regs)
     50 
     51 #define	PC_REGS(regs)	((db_addr_t)(regs)->tf_pc)
     52 
     53 #define	BKPT_INST	0x4e4f		/* breakpoint instruction */
     54 #define	BKPT_SIZE	(2)		/* size of breakpoint inst */
     55 #define	BKPT_SET(inst)	(BKPT_INST)
     56 
     57 #define	FIXUP_PC_AFTER_BREAK(regs)	((regs)->tf_pc -= BKPT_SIZE)
     58 
     59 #define SR_T1 0x8000
     60 #define	db_clear_single_step(regs)	((regs)->tf_sr &= ~SR_T1)
     61 #define	db_set_single_step(regs)	((regs)->tf_sr |=  SR_T1)
     62 
     63 #define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BREAKPOINT)
     64 #ifdef T_WATCHPOINT
     65 #define	IS_WATCHPOINT_TRAP(type, code)	((type) == T_WATCHPOINT)
     66 #else
     67 #define	IS_WATCHPOINT_TRAP(type, code)	0
     68 #endif
     69 
     70 #define	M_RTS		0xffff0000
     71 #define I_RTS		0x4e750000
     72 #define M_JSR		0xffc00000
     73 #define I_JSR		0x4e800000
     74 #define M_BSR		0xff000000
     75 #define I_BSR		0x61000000
     76 #define	M_RTE		0xffff0000
     77 #define	I_RTE		0x4e730000
     78 
     79 #define	inst_trap_return(ins)	(((ins)&M_RTE) == I_RTE)
     80 #define	inst_return(ins)	(((ins)&M_RTS) == I_RTS)
     81 #define	inst_call(ins)		(((ins)&M_JSR) == I_JSR || \
     82 				 ((ins)&M_BSR) == I_BSR)
     83 #define inst_load(ins)		0
     84 #define inst_store(ins)		0
     85 
     86 /*
     87  * Things needed by kgdb:
     88  */
     89 typedef long kgdb_reg_t;
     90 #define KGDB_NUMREGS	(16+2)
     91 #define KGDB_BUFLEN	512
     92 
     93 
     94 #ifdef _KERNEL
     95 
     96 void	Debugger __P((void));	/* XXX */
     97 void	kdb_kintr __P((db_regs_t *));
     98 int	kdb_trap __P((int, db_regs_t *));
     99 
    100 #endif /* _KERNEL */
    101 
    102 #endif	/* _M68K_DB_MACHDEP_H_ */
    103