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