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db_trap.c revision 1.5 
      1 /*	$NetBSD: db_trap.c,v 1.5 1994/06/29 06:31:22 cgd 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
     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 the
     26  * rights to redistribute these changes.
     27  *
     28  * 	Author: David B. Golub, Carnegie Mellon University
     29  *	Date:	7/90
     30  */
     31 
     32 /*
     33  * Trap entry point to kernel debugger.
     34  */
     35 #include <sys/param.h>
     36 #include <sys/proc.h>
     37 
     38 #include <ddb/db_command.h>
     39 #include <ddb/db_break.h>
     40 
     41 #include <setjmp.h>
     42 
     43 extern void		db_restart_at_pc();
     44 extern boolean_t	db_stop_at_pc();
     45 
     46 extern int		db_inst_count;
     47 extern int		db_load_count;
     48 extern int		db_store_count;
     49 
     50 extern jmp_buf		*db_recover;
     51 
     52 db_trap(type, code)
     53 	int	type, code;
     54 {
     55 	boolean_t	bkpt;
     56 	boolean_t	watchpt;
     57 	jmp_buf		db_jmpbuf;
     58 	jmp_buf		*savejmp = db_recover;
     59 
     60 	bkpt = IS_BREAKPOINT_TRAP(type, code);
     61 	watchpt = IS_WATCHPOINT_TRAP(type, code);
     62 
     63 	if (db_stop_at_pc(&bkpt)) {
     64 	    if (db_inst_count) {
     65 		db_printf("After %d instructions (%d loads, %d stores),\n",
     66 			  db_inst_count, db_load_count, db_store_count);
     67 	    }
     68 	    if (bkpt)
     69 		db_printf("Breakpoint at\t");
     70 	    else if (watchpt)
     71 		db_printf("Watchpoint at\t");
     72 	    else
     73 		db_printf("Stopped at\t");
     74 	    db_dot = PC_REGS(DDB_REGS);
     75 	    if (!setjmp(*(db_recover = &db_jmpbuf)))
     76 		db_print_loc_and_inst(db_dot);
     77 
     78 	    db_command_loop();
     79 	}
     80 
     81 	db_restart_at_pc(watchpt);
     82 }
     83