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db_trap.c revision 1.17.2.1 
      1 /*	$NetBSD: db_trap.c,v 1.17.2.1 2001/03/05 22:49:32 nathanw 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 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/lwp.h>
     37 #include <sys/proc.h>
     38 
     39 #include <machine/db_machdep.h>
     40 
     41 #include <ddb/db_run.h>
     42 #include <ddb/db_command.h>
     43 #include <ddb/db_break.h>
     44 #include <ddb/db_output.h>
     45 #include <ddb/db_sym.h>
     46 #include <ddb/db_extern.h>
     47 
     48 /*
     49  * db_trap_callback can be hooked by MD port code to handle special
     50  * cases such as disabling hardware watchdogs while in DDB.
     51  */
     52 void (*db_trap_callback)(int);
     53 
     54 void
     55 db_trap(type, code)
     56 	int	type, code;
     57 {
     58 	boolean_t	bkpt;
     59 	boolean_t	watchpt;
     60 
     61 	bkpt = IS_BREAKPOINT_TRAP(type, code);
     62 	watchpt = IS_WATCHPOINT_TRAP(type, code);
     63 
     64 	if (db_trap_callback) db_trap_callback(1);
     65 
     66 	if (db_stop_at_pc(DDB_REGS, &bkpt)) {
     67 	    if (db_inst_count) {
     68 		db_printf("After %d instructions (%d loads, %d stores),\n",
     69 			  db_inst_count, db_load_count, db_store_count);
     70 	    }
     71 	    if (curproc != NULL) {
     72 		if (bkpt)
     73 			db_printf("Breakpoint");
     74 		else if (watchpt)
     75 			db_printf("Watchpoint");
     76 		else
     77 			if (curproc->l_proc == NULL)
     78 				db_printf("Stopped; curproc = %p, curproc->l_proc is NULL at\t", curproc);
     79 			else
     80 				db_printf("Stopped in %s at\t", curproc->l_proc->p_comm);
     81 	    } else if (bkpt)
     82 		db_printf("Breakpoint at\t");
     83 	    else if (watchpt)
     84 		db_printf("Watchpoint at\t");
     85 	    else
     86 		db_printf("Stopped at\t");
     87 	    db_dot = PC_REGS(DDB_REGS);
     88 	    db_print_loc_and_inst(db_dot);
     89 
     90 	    db_command_loop();
     91 	}
     92 
     93 	db_restart_at_pc(DDB_REGS, watchpt);
     94 
     95 	if (db_trap_callback) db_trap_callback(0);
     96 }
     97