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 /*
   27  *      Author: David B. Golub, Carnegie Mellon University
   28  *      Date:   7/90
   29  */
   30 
   31 /*
   32  * Trap entry point to kernel debugger.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD: releng/5.2/sys/ddb/db_trap.c 116176 2003-06-10 22:09:23Z obrien $");
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 
   41 #include <ddb/ddb.h>
   42 #include <ddb/db_command.h>
   43 
   44 #include <machine/setjmp.h>
   45 
   46 extern jmp_buf  db_jmpbuf;
   47 
   48 void
   49 db_trap(type, code)
   50         int     type, code;
   51 {
   52         boolean_t       bkpt;
   53         boolean_t       watchpt;
   54 
   55         bkpt = IS_BREAKPOINT_TRAP(type, code);
   56         watchpt = IS_WATCHPOINT_TRAP(type, code);
   57 
   58         if (db_stop_at_pc(&bkpt)) {
   59             if (db_inst_count) {
   60                 db_printf("After %d instructions (%d loads, %d stores),\n",
   61                           db_inst_count, db_load_count, db_store_count);
   62             }
   63             if (bkpt)
   64                 db_printf("Breakpoint at\t");
   65             else if (watchpt)
   66                 db_printf("Watchpoint at\t");
   67             else
   68                 db_printf("Stopped at\t");
   69             db_dot = PC_REGS(DDB_REGS);
   70             if (setjmp(db_jmpbuf) == 0)
   71                 db_print_loc_and_inst(db_dot);
   72 
   73             db_command_loop();
   74         }
   75 
   76         db_restart_at_pc(watchpt);
   77 }

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

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