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db_machdep.h revision 1.3 
      1 /*
      2  * Mach Operating System
      3  * Copyright (c) 1992 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 (at) 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 
     27 /*
     28  * Machine-dependent defines for new kernel debugger.
     29  */
     30 #ifndef	_M68K_DB_MACHDEP_H_
     31 #define	_M68K_DB_MACHDEP_H_
     32 
     33 #include <vm/queue.h>
     34 #include <vm/vm_prot.h>
     35 #include <vm/vm_param.h>
     36 #include <vm/vm_inherit.h>
     37 #include <vm/lock.h>
     38 #include <machine/psl.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 struct mc68020_saved_state {
     44         int             d0;             /* data registers */
     45         int             d1;
     46         int             d2;
     47         int             d3;
     48         int             d4;
     49         int             d5;
     50         int             d6;
     51         int             d7;
     52         int             a0;             /* address registers */
     53         int             a1;
     54         int             a2;
     55         int             a3;
     56         int             a4;
     57         int             a5;
     58         int             a6;
     59         int             sp;             /* stack pointer */
     60         unsigned short  sr;             /* status register */
     61         unsigned int    pc;             /* program counter - UNALIGNED!!! */
     62         unsigned int    stkfmt  : 4;    /* rte stack frame format */
     63         unsigned int    vector  : 12;   /* vector number */
     64 };
     65 typedef struct mc68020_saved_state db_regs_t;
     66 db_regs_t	ddb_regs;		/* register state */
     67 #define DDB_REGS	(&ddb_regs)
     68 
     69 #define	PC_REGS(regs)	((db_addr_t)(regs)->pc)
     70 
     71 #define	BKPT_INST	0x4e4f		/* breakpoint instruction */
     72 #define	BKPT_SIZE	(2)		/* size of breakpoint inst */
     73 #define	BKPT_SET(inst)	(BKPT_INST)
     74 
     75 #define	FIXUP_PC_AFTER_BREAK	ddb_regs.pc -= 2;
     76 
     77 #define SR_T1 0x8000
     78 #define	db_clear_single_step(regs)	((regs)->sr &= ~SR_T1)
     79 #define	db_set_single_step(regs)	((regs)->sr |=  SR_T1)
     80 
     81 #define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BRKPT)
     82 #define	IS_WATCHPOINT_TRAP(type, code)	((type) == T_WATCHPOINT)
     83 
     84 #define	M_RTS		0xffff0000
     85 #define I_RTS		0x4e750000
     86 #define M_JSR		0xffc00000
     87 #define I_JSR		0x4e800000
     88 #define M_BSR		0xff000000
     89 #define I_BSR		0x61000000
     90 #define	M_RTE		0xffff0000
     91 #define	I_RTE		0x4e730000
     92 
     93 #define	inst_trap_return(ins)	(((ins)&M_RTE) == I_RTE)
     94 #define	inst_return(ins)	(((ins)&M_RTS) == I_RTS)
     95 #define	inst_call(ins)		(((ins)&M_JSR) == I_JSR || \
     96 				 ((ins)&M_BSR) == I_BSR)
     97 #define inst_load(ins)		0
     98 #define inst_store(ins)		0
     99 
    100 #endif	/* _M68K_DDB_MACHDEP_H_ */
    101