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db_machdep.h revision 1.13 
      1 /*	$NetBSD: db_machdep.h,v 1.13 1996/04/29 20:50:08 leo 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 #include <machine/psl.h>
     40 #include <machine/trap.h>
     41 
     42 typedef	vm_offset_t	db_addr_t;	/* address - unsigned */
     43 typedef	int		db_expr_t;	/* expression - signed */
     44 struct mc68020_saved_state {
     45 	int		d0;		/* data registers */
     46 	int		d1;
     47 	int		d2;
     48 	int		d3;
     49 	int		d4;
     50 	int		d5;
     51 	int		d6;
     52 	int		d7;
     53 	int		a0;		/* address registers */
     54 	int		a1;
     55 	int		a2;
     56 	int		a3;
     57 	int		a4;
     58 	int		a5;
     59 	int		a6;
     60 	int		sp;		/* stack pointer */
     61 	short		empty;
     62 	short		stackadj;
     63 	unsigned short	sr;		/* status register */
     64 	unsigned int	pc;		/* program counter - UNALIGNED!!! */
     65 	unsigned short	stkfmt	: 4;	/* rte stack frame format */
     66 	unsigned short	vector	: 12;	/* vector number */
     67 };
     68 typedef struct mc68020_saved_state db_regs_t;
     69 db_regs_t	ddb_regs;		/* register state */
     70 #define DDB_REGS	(&ddb_regs)
     71 
     72 #define	PC_REGS(regs)	((db_addr_t)(regs)->pc)
     73 
     74 #define	BKPT_INST	0x4e4f		/* breakpoint instruction */
     75 #define	BKPT_SIZE	(2)		/* size of breakpoint inst */
     76 #define	BKPT_SET(inst)	(BKPT_INST)
     77 
     78 #define	FIXUP_PC_AFTER_BREAK	ddb_regs.pc -= 2;
     79 
     80 #define SR_T1 0x8000
     81 #define	db_clear_single_step(regs)	((regs)->sr &= ~SR_T1)
     82 #define	db_set_single_step(regs)	((regs)->sr |=  SR_T1)
     83 
     84 #define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BREAKPOINT)
     85 #ifdef T_WATCHPOINT
     86 #define	IS_WATCHPOINT_TRAP(type, code)	((type) == T_WATCHPOINT)
     87 #else
     88 #define	IS_WATCHPOINT_TRAP(type, code)	0
     89 #endif
     90 
     91 #define	M_RTS		0xffff0000
     92 #define I_RTS		0x4e750000
     93 #define M_JSR		0xffc00000
     94 #define I_JSR		0x4e800000
     95 #define M_BSR		0xff000000
     96 #define I_BSR		0x61000000
     97 #define	M_RTE		0xffff0000
     98 #define	I_RTE		0x4e730000
     99 
    100 #define	inst_trap_return(ins)	(((ins)&M_RTE) == I_RTE)
    101 #define	inst_return(ins)	(((ins)&M_RTS) == I_RTS)
    102 #define	inst_call(ins)		(((ins)&M_JSR) == I_JSR || \
    103 				 ((ins)&M_BSR) == I_BSR)
    104 #define inst_load(ins)		0
    105 #define inst_store(ins)		0
    106 
    107 #ifdef _KERNEL
    108 
    109 void	kdb_kintr __P((struct mc68020_saved_state *));
    110 int	kdb_trap __P((int, struct mc68020_saved_state *));
    111 
    112 #endif /* _KERNEL */
    113 
    114 #endif	/* _M68K_DB_MACHDEP_H_ */
    115