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db_machdep.h revision 1.9 
      1 /*	$NetBSD: db_machdep.h,v 1.9 1996/05/03 19:23:59 christos 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	_I386_DB_MACHDEP_H_
     30 #define	_I386_DB_MACHDEP_H_
     31 
     32 /*
     33  * Machine-dependent defines for new kernel debugger.
     34  */
     35 
     36 #include <sys/param.h>
     37 #include <vm/vm.h>
     38 #include <machine/trap.h>
     39 
     40 typedef	vm_offset_t	db_addr_t;	/* address - unsigned */
     41 typedef	int		db_expr_t;	/* expression - signed */
     42 
     43 typedef struct trapframe db_regs_t;
     44 db_regs_t	ddb_regs;	/* register state */
     45 #define	DDB_REGS	(&ddb_regs)
     46 
     47 #define	PC_REGS(regs)	((db_addr_t)(regs)->tf_eip)
     48 
     49 #define	BKPT_INST	0xcc		/* breakpoint instruction */
     50 #define	BKPT_SIZE	(1)		/* size of breakpoint inst */
     51 #define	BKPT_SET(inst)	(BKPT_INST)
     52 
     53 #define	FIXUP_PC_AFTER_BREAK		ddb_regs.tf_eip -= BKPT_SIZE;
     54 
     55 #define	db_clear_single_step(regs)	((regs)->tf_eflags &= ~PSL_T)
     56 #define	db_set_single_step(regs)	((regs)->tf_eflags |=  PSL_T)
     57 
     58 #define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BPTFLT)
     59 #define IS_WATCHPOINT_TRAP(type, code)	((type) == T_TRCTRAP && (code) & 15)
     60 
     61 #define	I_CALL		0xe8
     62 #define	I_CALLI		0xff
     63 #define	I_RET		0xc3
     64 #define	I_IRET		0xcf
     65 
     66 #define	inst_trap_return(ins)	(((ins)&0xff) == I_IRET)
     67 #define	inst_return(ins)	(((ins)&0xff) == I_RET)
     68 #define	inst_call(ins)		(((ins)&0xff) == I_CALL || \
     69 				 (((ins)&0xff) == I_CALLI && \
     70 				  ((ins)&0x3800) == 0x1000))
     71 #define inst_load(ins)		0
     72 #define inst_store(ins)		0
     73 
     74 /* access capability and access macros */
     75 
     76 #define DB_ACCESS_LEVEL		2	/* access any space */
     77 #define DB_CHECK_ACCESS(addr,size,task)				\
     78 	db_check_access(addr,size,task)
     79 #define DB_PHYS_EQ(task1,addr1,task2,addr2)			\
     80 	db_phys_eq(task1,addr1,task2,addr2)
     81 #define DB_VALID_KERN_ADDR(addr)				\
     82 	((addr) >= VM_MIN_KERNEL_ADDRESS && 			\
     83 	 (addr) < VM_MAX_KERNEL_ADDRESS)
     84 #define DB_VALID_ADDRESS(addr,user)				\
     85 	((!(user) && DB_VALID_KERN_ADDR(addr)) ||		\
     86 	 ((user) && (addr) < VM_MAX_ADDRESS))
     87 
     88 #if 0
     89 boolean_t 	db_check_access __P((vm_offset_t, int, task_t));
     90 boolean_t	db_phys_eq __P((task_t, vm_offset_t, task_t, vm_offset_t));
     91 #endif
     92 
     93 /* macros for printing OS server dependent task name */
     94 
     95 #define DB_TASK_NAME(task)	db_task_name(task)
     96 #define DB_TASK_NAME_TITLE	"COMMAND                "
     97 #define DB_TASK_NAME_LEN	23
     98 #define DB_NULL_TASK_NAME	"?                      "
     99 
    100 #if 0
    101 void		db_task_name(/* task_t */);
    102 #endif
    103 
    104 /* macro for checking if a thread has used floating-point */
    105 
    106 #define db_thread_fp_used(thread)	((thread)->pcb->ims.ifps != 0)
    107 
    108 int kdb_trap __P((int, int, db_regs_t *));
    109 
    110 #endif	/* _I386_DB_MACHDEP_H_ */
    111