db_trap.c

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    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@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  * $FreeBSD$
   27  */
   28 
   29 /*
   30  *      Author: David B. Golub, Carnegie Mellon University
   31  *      Date:   7/90
   32  */
   33 
   34 /*
   35  * Trap entry point to kernel debugger.
   36  */
   37 #include <sys/param.h>
   38 
   39 #include <ddb/ddb.h>
   40 #include <ddb/db_command.h>
   41 
   42 #include <setjmp.h>
   43 
   44 extern jmp_buf  db_jmpbuf;
   45 
   46 void
   47 db_trap(type, code)
   48         int     type, code;
   49 {
   50         boolean_t       bkpt;
   51         boolean_t       watchpt;
   52 
   53         bkpt = IS_BREAKPOINT_TRAP(type, code);
   54         watchpt = IS_WATCHPOINT_TRAP(type, code);
   55 
   56         if (db_stop_at_pc(&bkpt)) {
   57             if (db_inst_count) {
   58                 db_printf("After %d instructions (%d loads, %d stores),\n",
   59                           db_inst_count, db_load_count, db_store_count);
   60             }
   61             if (bkpt)
   62                 db_printf("Breakpoint at\t");
   63             else if (watchpt)
   64                 db_printf("Watchpoint at\t");
   65             else
   66                 db_printf("Stopped at\t");
   67             db_dot = PC_REGS(DDB_REGS);
   68             if (setjmp(db_jmpbuf) == 0)
   69                 db_print_loc_and_inst(db_dot);
   70 
   71             db_command_loop();
   72         }
   73 
   74         db_restart_at_pc(watchpt);
   75 }

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FreeBSD/Linux Kernel Cross Reference sys/ddb/db_trap.c

FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_trap.c