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      1 /*	$NetBSD: db_trap.c,v 1.26 2019/03/12 07:44:58 skrll 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 
     36 #include <sys/cdefs.h>
     37 __KERNEL_RCSID(0, "$NetBSD: db_trap.c,v 1.26 2019/03/12 07:44:58 skrll Exp $");
     38 
     39 #include <sys/param.h>
     40 #include <sys/proc.h>
     41 
     42 #include <machine/db_machdep.h>
     43 
     44 #include <ddb/db_run.h>
     45 #include <ddb/db_command.h>
     46 #include <ddb/db_break.h>
     47 #include <ddb/db_output.h>
     48 #include <ddb/db_sym.h>
     49 #include <ddb/db_extern.h>
     50 
     51 /*
     52  * db_trap_callback can be hooked by MD port code to handle special
     53  * cases such as disabling hardware watchdogs while in DDB.
     54  */
     55 void (*db_trap_callback)(int);
     56 
     57 int db_trap_type;
     58 
     59 void
     60 db_trap(int type, int code)
     61 {
     62 	bool	bkpt;
     63 	bool	watchpt;
     64 
     65 	db_trap_type = type;
     66 
     67 	bkpt = IS_BREAKPOINT_TRAP(type, code);
     68 	watchpt = IS_WATCHPOINT_TRAP(type, code);
     69 
     70 	if (db_trap_callback)
     71 		db_trap_callback(1);
     72 
     73 	if (db_stop_at_pc(DDB_REGS, &bkpt)) {
     74 		if (db_inst_count) {
     75 			db_printf("After %d instructions "
     76 			    "(%d loads, %d stores),\n",
     77 			    db_inst_count, db_load_count, db_store_count);
     78 		}
     79 		if (bkpt)
     80 			db_printf("Breakpoint");
     81 		else if (watchpt)
     82 			db_printf("Watchpoint");
     83 		else
     84 			db_printf("Stopped");
     85 		db_printf(" in pid %d.%d (%s) at\t",
     86 		    curproc->p_pid, curlwp->l_lid,
     87 		    curproc->p_comm);
     88 		db_dot = PC_REGS(DDB_REGS);
     89 		db_print_loc_and_inst(db_dot);
     90 
     91 		db_command_loop();
     92 	}
     93 
     94 	db_restart_at_pc(DDB_REGS, watchpt);
     95 
     96 	if (db_trap_callback)
     97 		db_trap_callback(0);
     98 }
     99