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db_trap.c revision 1.4 
      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  * 	Author: David B. Golub, Carnegie Mellon University
     27  *	Date:	7/90
     28  *	$Id: db_trap.c,v 1.4 1994/04/04 08:59:38 mycroft Exp $
     29  */
     30 
     31 /*
     32  * Trap entry point to kernel debugger.
     33  */
     34 #include <sys/param.h>
     35 #include <sys/proc.h>
     36 
     37 #include <ddb/db_command.h>
     38 #include <ddb/db_break.h>
     39 
     40 #include <setjmp.h>
     41 
     42 extern void		db_restart_at_pc();
     43 extern boolean_t	db_stop_at_pc();
     44 
     45 extern int		db_inst_count;
     46 extern int		db_load_count;
     47 extern int		db_store_count;
     48 
     49 extern jmp_buf		*db_recover;
     50 
     51 db_trap(type, code)
     52 	int	type, code;
     53 {
     54 	boolean_t	bkpt;
     55 	boolean_t	watchpt;
     56 	jmp_buf		db_jmpbuf;
     57 	jmp_buf		*savejmp = db_recover;
     58 
     59 	bkpt = IS_BREAKPOINT_TRAP(type, code);
     60 	watchpt = IS_WATCHPOINT_TRAP(type, code);
     61 
     62 	if (db_stop_at_pc(&bkpt)) {
     63 	    if (db_inst_count) {
     64 		db_printf("After %d instructions (%d loads, %d stores),\n",
     65 			  db_inst_count, db_load_count, db_store_count);
     66 	    }
     67 	    if (bkpt)
     68 		db_printf("Breakpoint at\t");
     69 	    else if (watchpt)
     70 		db_printf("Watchpoint at\t");
     71 	    else
     72 		db_printf("Stopped at\t");
     73 	    db_dot = PC_REGS(DDB_REGS);
     74 	    if (!setjmp(*(db_recover = &db_jmpbuf)))
     75 		db_print_loc_and_inst(db_dot);
     76 
     77 	    db_command_loop();
     78 	}
     79 
     80 	db_restart_at_pc(watchpt);
     81 }
     82