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db_machdep.h revision 1.6 
      1 /* $NetBSD: db_machdep.h,v 1.6 1997/09/06 02:02:25 thorpej Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1995 Carnegie-Mellon University.
      5  * All rights reserved.
      6  *
      7  * Author: Chris G. Demetriou
      8  *
      9  * Permission to use, copy, modify and distribute this software and
     10  * its documentation is hereby granted, provided that both the copyright
     11  * notice and this permission notice appear in all copies of the
     12  * software, derivative works or modified versions, and any portions
     13  * thereof, and that both notices appear in supporting documentation.
     14  *
     15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     18  *
     19  * Carnegie Mellon requests users of this software to return to
     20  *
     21  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     22  *  School of Computer Science
     23  *  Carnegie Mellon University
     24  *  Pittsburgh PA 15213-3890
     25  *
     26  * any improvements or extensions that they make and grant Carnegie the
     27  * rights to redistribute these changes.
     28  */
     29 
     30 #ifndef	_ALPHA_DB_MACHDEP_H_
     31 #define	_ALPHA_DB_MACHDEP_H_
     32 
     33 /*
     34  * Machine-dependent defines for new kernel debugger.
     35  */
     36 
     37 #include <sys/param.h>
     38 #include <vm/vm.h>
     39 #include <machine/frame.h>
     40 
     41 typedef	vm_offset_t	db_addr_t;	/* address - unsigned */
     42 typedef	long		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)->tf_regs[FRAME_PC])
     49 
     50 #define	BKPT_INST	0x00000080	/* breakpoint instruction */
     51 #define	BKPT_SIZE	(4)		/* size of breakpoint inst */
     52 #define	BKPT_SET(inst)	(BKPT_INST)
     53 
     54 #if 0
     55 #define	FIXUP_PC_AFTER_BREAK(regs) \
     56 	((regs)->tf_regs[FRAME_PC] -= BKPT_SIZE)
     57 #endif
     58 
     59 #define	SOFTWARE_SSTEP	1		/* no hardware support */
     60 #define	IS_BREAKPOINT_TRAP(type, code)	((type) == ALPHA_KENTRY_IF && \
     61 					 (code) == ALPHA_IF_CODE_BPT)
     62 #define	IS_WATCHPOINT_TRAP(type, code)	0
     63 
     64 /*
     65  * Functions needed for software single-stepping.
     66  */
     67 
     68 boolean_t	db_inst_trap_return __P((int inst));
     69 boolean_t	db_inst_return __P((int inst));
     70 boolean_t	db_inst_call __P((int inst));
     71 boolean_t	db_inst_branch __P((int inst));
     72 boolean_t	db_inst_load __P((int inst));
     73 boolean_t	db_inst_store __P((int inst));
     74 boolean_t	db_inst_unconditional_flow_transfer __P((int inst));
     75 db_addr_t	db_branch_taken __P((int inst, db_addr_t pc, db_regs_t *regs));
     76 
     77 #define	inst_trap_return(ins)	db_inst_trap_return(ins)
     78 #define	inst_return(ins)	db_inst_return(ins)
     79 #define	inst_call(ins)		db_inst_call(ins)
     80 #define	inst_branch(ins)	db_inst_branch(ins)
     81 #define	inst_load(ins)		db_inst_load(ins)
     82 #define	inst_store(ins)		db_inst_store(ins)
     83 #define	inst_unconditional_flow_transfer(ins) \
     84 				db_inst_unconditional_flow_transfer(ins)
     85 #define	branch_taken(ins, pc, regs) \
     86 				db_branch_taken((ins), (pc), (regs))
     87 
     88 /* No delay slots on Alpha. */
     89 #define	next_instr_address(v, b) ((db_addr_t) ((b) ? (v) : ((v) + 4)))
     90 
     91 u_long	db_register_value __P((db_regs_t *, int));
     92 int	ddb_trap __P((unsigned long, unsigned long, unsigned long,
     93 	    unsigned long, struct trapframe *));
     94 
     95 /*
     96  * We define some of our own commands.
     97  */
     98 #define	DB_MACHINE_COMMANDS
     99 
    100 /*
    101  * We use Elf64 symbols in DDB.
    102  */
    103 #define	DB_ELF_SYMBOLS
    104 #define	DB_ELFSIZE	64
    105 
    106 #endif	/* _ALPHA_DB_MACHDEP_H_ */
    107