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db_machdep.h revision 1.21 
      1 /*	$NetBSD: db_machdep.h,v 1.21 2003/04/29 17:06:05 scw 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 <uvm/uvm_extern.h>
     38 #include <machine/trap.h>
     39 
     40 typedef	vaddr_t		db_addr_t;	/* address - unsigned */
     41 typedef	long		db_expr_t;	/* expression - signed */
     42 
     43 typedef struct trapframe db_regs_t;
     44 #ifndef MULTIPROCESSOR
     45 extern db_regs_t ddb_regs;	/* register state */
     46 #define	DDB_REGS	(&ddb_regs)
     47 #else
     48 extern db_regs_t *ddb_regp;
     49 #define DDB_REGS	(ddb_regp)
     50 #define ddb_regs	(*ddb_regp)
     51 #endif
     52 
     53 #define	PC_REGS(regs)	((regs)->tf_eip)
     54 
     55 #define	BKPT_ADDR(addr)	(addr)		/* breakpoint address */
     56 #define	BKPT_INST	0xcc		/* breakpoint instruction */
     57 #define	BKPT_SIZE	(1)		/* size of breakpoint inst */
     58 #define	BKPT_SET(inst)	(BKPT_INST)
     59 
     60 #define	FIXUP_PC_AFTER_BREAK(regs)	((regs)->tf_eip -= BKPT_SIZE)
     61 
     62 #define	db_clear_single_step(regs)	((regs)->tf_eflags &= ~PSL_T)
     63 #define	db_set_single_step(regs)	((regs)->tf_eflags |=  PSL_T)
     64 
     65 #define	IS_BREAKPOINT_TRAP(type, code)	((type) == T_BPTFLT)
     66 #define IS_WATCHPOINT_TRAP(type, code)	((type) == T_TRCTRAP && (code) & 15)
     67 
     68 #define	I_CALL		0xe8
     69 #define	I_CALLI		0xff
     70 #define	I_RET		0xc3
     71 #define	I_IRET		0xcf
     72 
     73 #define	inst_trap_return(ins)	(((ins)&0xff) == I_IRET)
     74 #define	inst_return(ins)	(((ins)&0xff) == I_RET)
     75 #define	inst_call(ins)		(((ins)&0xff) == I_CALL || \
     76 				 (((ins)&0xff) == I_CALLI && \
     77 				  ((ins)&0x3800) == 0x1000))
     78 #define inst_load(ins)		0
     79 #define inst_store(ins)		0
     80 
     81 /* access capability and access macros */
     82 
     83 #define DB_ACCESS_LEVEL		2	/* access any space */
     84 #define DB_CHECK_ACCESS(addr,size,task)				\
     85 	db_check_access(addr,size,task)
     86 #define DB_PHYS_EQ(task1,addr1,task2,addr2)			\
     87 	db_phys_eq(task1,addr1,task2,addr2)
     88 #define DB_VALID_KERN_ADDR(addr)				\
     89 	((addr) >= VM_MIN_KERNEL_ADDRESS && 			\
     90 	 (addr) < VM_MAX_KERNEL_ADDRESS)
     91 #define DB_VALID_ADDRESS(addr,user)				\
     92 	((!(user) && DB_VALID_KERN_ADDR(addr)) ||		\
     93 	 ((user) && (addr) < VM_MAX_ADDRESS))
     94 
     95 #if 0
     96 boolean_t 	db_check_access __P((vaddr_t, int, task_t));
     97 boolean_t	db_phys_eq __P((task_t, vaddr_t, task_t, vaddr_t));
     98 #endif
     99 
    100 /* macros for printing OS server dependent task name */
    101 
    102 #define DB_TASK_NAME(task)	db_task_name(task)
    103 #define DB_TASK_NAME_TITLE	"COMMAND                "
    104 #define DB_TASK_NAME_LEN	23
    105 #define DB_NULL_TASK_NAME	"?                      "
    106 
    107 /*
    108  * Constants for KGDB.
    109  */
    110 typedef	long		kgdb_reg_t;
    111 #define	KGDB_NUMREGS	16
    112 #define	KGDB_BUFLEN	512
    113 
    114 #if 0
    115 void		db_task_name(/* task_t */);
    116 #endif
    117 
    118 /* macro for checking if a thread has used floating-point */
    119 
    120 #define db_thread_fp_used(thread)	((thread)->pcb->ims.ifps != 0)
    121 
    122 int kdb_trap __P((int, int, db_regs_t *));
    123 
    124 /*
    125  * We define some of our own commands
    126  */
    127 #define DB_MACHINE_COMMANDS
    128 
    129 /*
    130  * We use either a.out or Elf32 symbols in DDB.
    131  */
    132 #define	DB_AOUT_SYMBOLS
    133 #define	DB_ELF_SYMBOLS
    134 #define	DB_ELFSIZE	32
    135 
    136 extern void db_machine_init __P((void));
    137 
    138 extern void cpu_debug_dump __P((void));
    139 
    140 #endif	/* _I386_DB_MACHDEP_H_ */
    141