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db_trap.c revision 1.1 
      1 /*
      2  * Mach Operating System
      3  * Copyright (c) 1991,1990 Carnegie Mellon University
      4  * All Rights Reserved.
      5  *
      6  * Permission to use, copy, modify and distribute this software and its
      7  * documentation is hereby granted, provided that both the copyright
      8  * notice and this permission notice appear in all copies of the
      9  * software, derivative works or modified versions, and any portions
     10  * thereof, and that both notices appear in supporting documentation.
     11  *
     12  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
     13  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     14  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     15  *
     16  * Carnegie Mellon requests users of this software to return to
     17  *
     18  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     19  *  School of Computer Science
     20  *  Carnegie Mellon University
     21  *  Pittsburgh PA 15213-3890
     22  *
     23  * any improvements or extensions that they make and grant Carnegie the
     24  * rights to redistribute these changes.
     25  */
     26 /*
     27  * HISTORY
     28  * $Log: db_trap.c,v $
     29  * Revision 1.1  1993/03/21 09:45:37  cgd
     30  * Initial revision
     31  *
     32  * Revision 1.1  1992/03/25  21:45:31  pace
     33  * Initial revision
     34  *
     35  * Revision 2.5  91/02/05  17:07:16  mrt
     36  * 	Changed to new Mach copyright
     37  * 	[91/01/31  16:19:35  mrt]
     38  *
     39  * Revision 2.4  91/01/08  15:09:17  rpd
     40  * 	Changed db_stop_at_pc's arguments.
     41  * 	Print db_inst_count, db_load_count, db_store_count.
     42  * 	[90/11/27            rpd]
     43  *
     44  * Revision 2.3  90/10/25  14:44:11  rwd
     45  * 	From rpd.
     46  * 	[90/10/19  17:03:17  rwd]
     47  *
     48  * 	Generalized the watchpoint support.
     49  * 	[90/10/16            rwd]
     50  * 	Added watchpoint support.
     51  * 	[90/10/16            rpd]
     52  *
     53  * Revision 2.2  90/08/27  21:52:52  dbg
     54  * 	Assign to db_dot before calling the print function.
     55  * 	[90/08/20            af]
     56  * 	Reduce lint.
     57  * 	[90/08/07            dbg]
     58  * 	Created.
     59  * 	[90/07/25            dbg]
     60  *
     61  */
     62 /*
     63  * 	Author: David B. Golub, Carnegie Mellon University
     64  *	Date:	7/90
     65  */
     66 
     67 /*
     68  * Trap entry point to kernel debugger.
     69  */
     70 #include "param.h"
     71 #include "proc.h"
     72 #include <ddb/db_command.h>
     73 #include <ddb/db_break.h>
     74 
     75 extern void		db_restart_at_pc();
     76 extern boolean_t	db_stop_at_pc();
     77 
     78 extern int		db_inst_count;
     79 extern int		db_load_count;
     80 extern int		db_store_count;
     81 
     82 db_trap(type, code)
     83 	int	type, code;
     84 {
     85 	boolean_t	bkpt;
     86 	boolean_t	watchpt;
     87 
     88 	bkpt = IS_BREAKPOINT_TRAP(type, code);
     89 	watchpt = IS_WATCHPOINT_TRAP(type, code);
     90 
     91 	if (db_stop_at_pc(&bkpt)) {
     92 	    if (db_inst_count) {
     93 		db_printf("After %d instructions (%d loads, %d stores),\n",
     94 			  db_inst_count, db_load_count, db_store_count);
     95 	    }
     96 	    if (bkpt)
     97 		db_printf("Breakpoint at\t");
     98 	    else if (watchpt)
     99 		db_printf("Watchpoint at\t");
    100 	    else
    101 		db_printf("Stopped at\t");
    102 	    db_dot = PC_REGS(DDB_REGS);
    103 	    db_print_loc_and_inst(db_dot);
    104 
    105 	    db_command_loop();
    106 	}
    107 
    108 	db_restart_at_pc(watchpt);
    109 }
    110