osfmk/ddb/db_trap.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  24  */
  25 /*
  26  * Mach Operating System
  27  * Copyright (c) 1991,1990 Carnegie Mellon University
  28  * All Rights Reserved.
  29  *
  30  * Permission to use, copy, modify and distribute this software and its
  31  * documentation is hereby granted, provided that both the copyright
  32  * notice and this permission notice appear in all copies of the
  33  * software, derivative works or modified versions, and any portions
  34  * thereof, and that both notices appear in supporting documentation.
  35  *
  36  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  37  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  38  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  39  *
  40  * Carnegie Mellon requests users of this software to return to
  41  *
  42  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  43  *  School of Computer Science
  44  *  Carnegie Mellon University
  45  *  Pittsburgh PA 15213-3890
  46  *
  47  * any improvements or extensions that they make and grant Carnegie Mellon
  48  * the rights to redistribute these changes.
  49  */
  50 /*
  51  */
  52 /*
  53  *      Author: David B. Golub, Carnegie Mellon University
  54  *      Date:   7/90
  55  */
  56
  57 /*
  58  * Trap entry point to kernel debugger.
  59  */
  60 #include <mach/boolean.h>
  61 #include <machine/db_machdep.h>
  62 #include <kern/misc_protos.h>
  63 #include <ddb/db_access.h>
  64 #include <ddb/db_break.h>
  65 #include <ddb/db_command.h>
  66 #include <ddb/db_examine.h>
  67 #include <ddb/db_output.h>              /* For db_printf() */
  68 #include <ddb/db_run.h>
  69 #include <ddb/db_task_thread.h>
  70 #include <ddb/db_trap.h>
  71 #include <machine/setjmp.h>
  72
  73 extern jmp_buf_t *db_recover;
  74
  75 extern int              db_inst_count;
  76 extern int              db_load_count;
  77 extern int              db_store_count;
  78
  79 #if     PARAGON860 && NCPUS > 1
  80 extern int      db_first_cpu;
  81 #endif
  82
  83 void
  84 db_task_trap(
  85         int             type,
  86         int             code,
  87         boolean_t       user_space)
  88 {
  89         jmp_buf_t db_jmpbuf;
  90         jmp_buf_t *prev;
  91         boolean_t       bkpt;
  92         boolean_t       watchpt;
  93         task_t          task;
  94         task_t          task_space;
  95
  96         task = db_current_task();
  97         task_space = db_target_space(current_act(), user_space);
  98         bkpt = IS_BREAKPOINT_TRAP(type, code);
  99         watchpt = IS_WATCHPOINT_TRAP(type, code);
 100
 101         /*
 102          * Note:  we look up PC values in an address space (task_space),
 103          * but print symbols using a (task-specific) symbol table, found
 104          * using task.
 105          */
 106         db_init_default_act();
 107         db_check_breakpoint_valid();
 108         if (db_stop_at_pc(&bkpt, task, task_space)) {
 109             if (db_inst_count) {
 110                 db_printf("After %d instructions (%d loads, %d stores),\n",
 111                           db_inst_count, db_load_count, db_store_count);
 112             }
 113             if (bkpt)
 114                 db_printf("Breakpoint at  ");
 115             else if (watchpt)
 116                 db_printf("Watchpoint at  ");
 117             else
 118                 db_printf("Stopped at  ");
 119             db_dot = PC_REGS(DDB_REGS);
 120
 121             prev = db_recover;
 122             if (_setjmp(db_recover = &db_jmpbuf) == 0) {
 123 #if defined(__alpha)
 124                 db_print_loc(db_dot, task_space);
 125                 db_printf("\n\t");
 126                 db_print_inst(db_dot, task_space);
 127 #else /* !defined(__alpha) */
 128 #if defined(__ppc__)
 129                 db_print_loc_and_inst(db_dot, task_space);
 130 #else   /* __ppc__ */
 131                 db_print_loc_and_inst(db_dot, task);
 132 #endif  /* __ppc__ */
 133 #endif /* defined(__alpha) */
 134             } else
 135                 db_printf("Trouble printing location %#X.\n", db_dot);
 136             db_recover = prev;
 137
 138             db_command_loop();
 139         }
 140
 141         db_restart_at_pc(watchpt, task_space);
 142 }