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db_machdep.h revision 1.2 
      1 /*	$NetBSD: db_machdep.h,v 1.2 2000/06/29 07:44:03 mrg Exp $	*/
      2 
      3 /*
      4  * Mach Operating System
      5  * Copyright (c) 1991,1990 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 #ifndef	_SH3_DB_MACHDEP_H_
     30 #define	_SH3_DB_MACHDEP_H_
     31 
     32 /*
     33  * Machine-dependent defines for new kernel debugger.
     34  */
     35 
     36 #include <sys/param.h>
     37 #include <uvm/uvm_extern.h>
     38 #include <machine/trap.h>
     39 
     40 typedef	vm_offset_t	db_addr_t;	/* address - unsigned */
     41 #if 1
     42 typedef	long		db_expr_t;	/* expression - signed */
     43 #else
     44 typedef	short		db_expr_t;	/* expression - signed */
     45 #endif
     46 
     47 typedef struct trapframe db_regs_t;
     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_spc)
     52 
     53 #define	BKPT_INST	0xc3c3		/* 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_spc -= BKPT_SIZE)
     58 
     59 #define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_USERBREAK)
     60 #define IS_WATCHPOINT_TRAP(type, code)	(0) /* XXX (msaitoh) */
     61 
     62 #define	I_CALL		0xe8
     63 #define	I_CALLI		0xff
     64 #define	I_RET		0xc3
     65 #define	I_IRET		0xcf
     66 
     67 #define	inst_trap_return(ins)	(((ins)&0xff) == I_IRET)
     68 #define	inst_return(ins)	(((ins)&0xff) == I_RET)
     69 #define	inst_call(ins)		(((ins)&0xff) == I_CALL || \
     70 				 (((ins)&0xff) == I_CALLI && \
     71 				  ((ins)&0x3800) == 0x1000))
     72 #define inst_load(ins)		0
     73 #define inst_store(ins)		0
     74 
     75 /* access capability and access macros */
     76 
     77 #define DB_ACCESS_LEVEL		2	/* access any space */
     78 #define DB_CHECK_ACCESS(addr, size, task)			\
     79 	db_check_access(addr, size, task)
     80 #define DB_PHYS_EQ(task1, addr1, task2, addr2)			\
     81 	db_phys_eq(task1, addr1, task2, addr2)
     82 #define DB_VALID_KERN_ADDR(addr)				\
     83 	((addr) >= VM_MIN_KERNEL_ADDRESS && 			\
     84 	 (addr) < VM_MAX_KERNEL_ADDRESS)
     85 #define DB_VALID_ADDRESS(addr, user)				\
     86 	((!(user) && DB_VALID_KERN_ADDR(addr)) ||		\
     87 	 ((user) && (addr) < VM_MAX_ADDRESS))
     88 
     89 #if 0
     90 boolean_t 	db_check_access __P((vm_offset_t, int, task_t));
     91 boolean_t	db_phys_eq __P((task_t, vm_offset_t, task_t, vm_offset_t));
     92 #endif
     93 
     94 /* macros for printing OS server dependent task name */
     95 
     96 #define DB_TASK_NAME(task)	db_task_name(task)
     97 #define DB_TASK_NAME_TITLE	"COMMAND                "
     98 #define DB_TASK_NAME_LEN	23
     99 #define DB_NULL_TASK_NAME	"?                      "
    100 
    101 /*
    102  * Constants for KGDB.
    103  */
    104 typedef	long		kgdb_reg_t;
    105 #define	KGDB_NUMREGS	14
    106 #define	KGDB_BUFLEN	512
    107 
    108 #if 0
    109 void		db_task_name(/* task_t */);
    110 #endif
    111 
    112 /* macro for checking if a thread has used floating-point */
    113 
    114 #define db_thread_fp_used(thread)	((thread)->pcb->ims.ifps != 0)
    115 #define	next_instr_address(v, b) ((db_addr_t) ((b) ? (v + 4) : ((v) + 2)))
    116 
    117 int kdb_trap __P((int, int, db_regs_t *));
    118 
    119 /*
    120  * We use ELF symbols in DDB.
    121  *
    122  */
    123 #define	DB_ELF_SYMBOLS
    124 #define	DB_ELFSIZE	32
    125 
    126 /*
    127  * SH cpus have no hardware single-step.
    128  */
    129 #define SOFTWARE_SSTEP
    130 
    131 /* XXX following three functions is not implemented yet. (msaitoh) */
    132 boolean_t inst_branch __P((int inst));
    133 db_addr_t branch_taken __P((int inst, db_addr_t pc, db_regs_t *regs));
    134 boolean_t inst_unconditional_flow_transfer __P((int inst));
    135 
    136 #endif	/* _SH3_DB_MACHDEP_H_ */
    137