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Annotation of Gnu-Mach/ddb/db_trap.c, revision 1.1.1.1

1.1       root        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 "AS IS"
                     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  [email protected]
                     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 Mellon
                     24:  * the rights to redistribute these changes.
                     25:  */
                     26: /*
                     27:  *     Author: David B. Golub, Carnegie Mellon University
                     28:  *     Date:   7/90
                     29:  */
                     30: 
                     31: #include "mach_kdb.h"
                     32: #if MACH_KDB
                     33: 
                     34: /*
                     35:  * Trap entry point to kernel debugger.
                     36:  */
                     37: #include <mach/boolean.h>
                     38: #include <machine/db_machdep.h>
                     39: #include <ddb/db_command.h>
                     40: #include <ddb/db_access.h>
                     41: #include <ddb/db_break.h>
                     42: #include <ddb/db_task_thread.h>
                     43: 
                     44: 
                     45: 
                     46: extern jmp_buf_t *db_recover;
                     47: 
                     48: extern void            db_restart_at_pc();
                     49: extern boolean_t       db_stop_at_pc();
                     50: 
                     51: extern int             db_inst_count;
                     52: extern int             db_load_count;
                     53: extern int             db_store_count;
                     54: 
                     55: void
                     56: db_task_trap(type, code, user_space)
                     57:        int       type, code;
                     58:        boolean_t user_space;
                     59: {
                     60:        jmp_buf_t db_jmpbuf;
                     61:        jmp_buf_t *prev;
                     62:        boolean_t       bkpt;
                     63:        boolean_t       watchpt;
                     64:        void            db_init_default_thread();
                     65:        void            db_check_breakpoint_valid();
                     66:        task_t          task_space;
                     67: 
                     68:        task_space = db_target_space(current_thread(), user_space);
                     69:        bkpt = IS_BREAKPOINT_TRAP(type, code);
                     70:        watchpt = IS_WATCHPOINT_TRAP(type, code);
                     71: 
                     72:        db_init_default_thread();
                     73:        db_check_breakpoint_valid();
                     74:        if (db_stop_at_pc(&bkpt, task_space)) {
                     75:            if (db_inst_count) {
                     76:                db_printf("After %d instructions (%d loads, %d stores),\n",
                     77:                          db_inst_count, db_load_count, db_store_count);
                     78:            }
                     79:            if (bkpt)
                     80:                db_printf("Breakpoint at  ");
                     81:            else if (watchpt)
                     82:                db_printf("Watchpoint at  ");
                     83:            else
                     84:                db_printf("Stopped at  ");
                     85:            db_dot = PC_REGS(DDB_REGS);
                     86: 
                     87:            prev = db_recover;
                     88:            if (_setjmp(db_recover = &db_jmpbuf) == 0)
                     89:                db_print_loc_and_inst(db_dot, task_space);
                     90:            else
                     91:                db_printf("Trouble printing location %#X.\n", db_dot);
                     92:            db_recover = prev;
                     93: 
                     94:            db_command_loop();
                     95:        }
                     96: 
                     97:        db_restart_at_pc(watchpt, task_space);
                     98: }
                     99: 
                    100: void
                    101: db_trap(type, code)
                    102:        int     type, code;
                    103: {
                    104:        db_task_trap(type, code, !DB_VALID_KERN_ADDR(PC_REGS(DDB_REGS)));
                    105: }
                    106: 
                    107: #endif MACH_KDB

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