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db_machdep.h revision 1.29 
      1 /*	$NetBSD: db_machdep.h,v 1.29 2011/04/11 04:22:30 mrg 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 <sys/types.h>
     36 
     37 /*
     38  * XXX - Would rather not pull in vm headers, but need boolean_t,
     39  * at least until boolean_t moves to <sys/types.h> or someplace.
     40  */
     41 #include <uvm/uvm_param.h>
     42 
     43 #include <machine/frame.h>
     44 #include <machine/pcb.h>
     45 #include <machine/psl.h>
     46 #include <machine/trap.h>
     47 
     48 typedef	vaddr_t		db_addr_t;	/* address - unsigned */
     49 typedef	long		db_expr_t;	/* expression - signed */
     50 typedef struct trapframe db_regs_t;
     51 
     52 extern db_regs_t	ddb_regs;	/* register state */
     53 #define DDB_REGS	(&ddb_regs)
     54 
     55 #define	PC_REGS(regs)	((regs)->tf_pc)
     56 
     57 #define	BKPT_ADDR(addr)	(addr)		/* breakpoint address */
     58 #define	BKPT_INST	0x4e4f		/* breakpoint instruction */
     59 #define	BKPT_SIZE	(2)		/* size of breakpoint inst */
     60 #define	BKPT_SET(inst, addr)	(BKPT_INST)
     61 
     62 #define	FIXUP_PC_AFTER_BREAK(regs)	((regs)->tf_pc -= BKPT_SIZE)
     63 
     64 #define	db_clear_single_step(regs)	((regs)->tf_sr &= ~PSL_T)
     65 #define	db_set_single_step(regs)	((regs)->tf_sr |=  PSL_T)
     66 
     67 #define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BREAKPOINT)
     68 #ifdef T_WATCHPOINT
     69 #define	IS_WATCHPOINT_TRAP(type, code)	((type) == T_WATCHPOINT)
     70 #else
     71 #define	IS_WATCHPOINT_TRAP(type, code)	0
     72 #endif
     73 
     74 #define	M_RTS		0xffff0000
     75 #define I_RTS		0x4e750000
     76 #define M_JSR		0xffc00000
     77 #define I_JSR		0x4e800000
     78 #define M_BSR		0xff000000
     79 #define I_BSR		0x61000000
     80 #define	M_RTE		0xffff0000
     81 #define	I_RTE		0x4e730000
     82 
     83 #define	inst_trap_return(ins)	(((ins)&M_RTE) == I_RTE)
     84 #define	inst_return(ins)	(((ins)&M_RTS) == I_RTS)
     85 #define	inst_call(ins)		(((ins)&M_JSR) == I_JSR || \
     86 				 ((ins)&M_BSR) == I_BSR)
     87 #define inst_load(ins)		0
     88 #define inst_store(ins)		0
     89 
     90 /*
     91  * Things needed by kgdb:
     92  */
     93 typedef long kgdb_reg_t;
     94 #define KGDB_NUMREGS	(16+2)
     95 #define KGDB_BUFLEN	512
     96 
     97 
     98 #ifdef _KERNEL
     99 
    100 void	Debugger(void);		/* XXX */
    101 void	kdb_kintr(db_regs_t *);
    102 int 	kdb_trap(int, db_regs_t *);
    103 
    104 #endif /* _KERNEL */
    105 
    106 /*
    107  * We use Elf32 symbols in DDB.
    108  */
    109 #define	DB_ELF_SYMBOLS
    110 #define	DB_ELFSIZE	32
    111 
    112 #endif	/* _M68K_DB_MACHDEP_H_ */
    113