[apple/xnu.git] / osfmk / ddb / db_trap.c

/*
 * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * @OSF_COPYRIGHT@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1991,1990 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 * 
 * any improvements or extensions that they make and grant Carnegie Mellon
 * the rights to redistribute these changes.
 */
/*
 */
/*
 * 	Author: David B. Golub, Carnegie Mellon University
 *	Date:	7/90
 */

/*
 * Trap entry point to kernel debugger.
 */
#include <mach/boolean.h>
#include <machine/db_machdep.h>
#include <kern/misc_protos.h>
#include <ddb/db_access.h>
#include <ddb/db_break.h>
#include <ddb/db_command.h>
#include <ddb/db_examine.h>
#include <ddb/db_output.h>             /* For db_printf() */
#include <ddb/db_run.h>
#include <ddb/db_task_thread.h>
#include <ddb/db_trap.h>
#include <machine/setjmp.h>

extern jmp_buf_t *db_recover;

extern int		db_inst_count;
extern int		db_load_count;
extern int		db_store_count;

void
db_task_trap(
	int		type,
	int		code,
	boolean_t	user_space)
{
	jmp_buf_t db_jmpbuf;
	jmp_buf_t *prev;
	boolean_t	bkpt;
	boolean_t	watchpt;
	task_t		task;
	task_t		task_space;

	task = db_current_task();
	task_space = db_target_space(current_thread(), user_space);
	bkpt = IS_BREAKPOINT_TRAP(type, code);
	watchpt = IS_WATCHPOINT_TRAP(type, code);

	/*
	 * Note:  we look up PC values in an address space (task_space),
	 * but print symbols using a (task-specific) symbol table, found
	 * using task.
	 */

	/* Elided since walking the thread/task lists before setting up
	 * safe recovery points is incorrect, and could
	 * potentially cause us to loop and fault indefinitely.
	 */
#if 0	
	db_init_default_act();
#endif       
	db_check_breakpoint_valid();

	if (db_stop_at_pc(&bkpt, task, task_space)) {
	    if (db_inst_count) {
		db_printf("After %d instructions (%d loads, %d stores),\n",
			  db_inst_count, db_load_count, db_store_count);
	    }
	    if (bkpt)
		db_printf("Breakpoint at  ");
	    else if (watchpt)
		db_printf("Watchpoint at  ");
	    else
		db_printf("Stopped at  ");
	    db_dot = PC_REGS(DDB_REGS);

	    prev = db_recover;
	    if (_setjmp(db_recover = &db_jmpbuf) == 0) {
#if defined(__alpha)
		db_print_loc(db_dot, task_space);
		db_printf("\n\t");
		db_print_inst(db_dot, task_space);
#else /* !defined(__alpha) */
#if defined(__ppc__)
		db_print_loc_and_inst(db_dot, task_space);
#else	/* __ppc__ */
		db_print_loc_and_inst(db_dot, task);
#endif	/* __ppc__ */
#endif /* defined(__alpha) */
	    } else
		db_printf("Trouble printing location %#llX.\n", (unsigned long long)db_dot);
	    db_recover = prev;

	    db_command_loop();
	}

	db_restart_at_pc(watchpt, task_space);
}
Commit	Line	Data
1c79356b	1	/*
91447636	2	* Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
1c79356b	3	*
8f6c56a5	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
8f6c56a5 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
8ad349bb	24	* limitations under the License.
8f6c56a5 A	25	*
8f6c56a5 A	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/*
	29	* @OSF_COPYRIGHT@
	30	*/
	31	/*
	32	* Mach Operating System
	33	* Copyright (c) 1991,1990 Carnegie Mellon University
	34	* All Rights Reserved.
	35	*
	36	* Permission to use, copy, modify and distribute this software and its
	37	* documentation is hereby granted, provided that both the copyright
	38	* notice and this permission notice appear in all copies of the
	39	* software, derivative works or modified versions, and any portions
	40	* thereof, and that both notices appear in supporting documentation.
	41	*
	42	* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
	43	* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
	44	* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
	45	*
	46	* Carnegie Mellon requests users of this software to return to
	47	*
	48	* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
	49	* School of Computer Science
	50	* Carnegie Mellon University
	51	* Pittsburgh PA 15213-3890
	52	*
	53	* any improvements or extensions that they make and grant Carnegie Mellon
	54	* the rights to redistribute these changes.
	55	*/
	56	/*
	57	*/
	58	/*
	59	* Author: David B. Golub, Carnegie Mellon University
	60	* Date: 7/90
	61	*/
	62
	63	/*
	64	* Trap entry point to kernel debugger.
	65	*/
	66	#include <mach/boolean.h>
	67	#include <machine/db_machdep.h>
	68	#include <kern/misc_protos.h>
	69	#include <ddb/db_access.h>
	70	#include <ddb/db_break.h>
	71	#include <ddb/db_command.h>
	72	#include <ddb/db_examine.h>
89b3af67	73	#include <ddb/db_output.h> /* For db_printf() */
1c79356b A	74	#include <ddb/db_run.h>
	75	#include <ddb/db_task_thread.h>
	76	#include <ddb/db_trap.h>
	77	#include <machine/setjmp.h>
	78
	79	extern jmp_buf_t *db_recover;
	80
	81	extern int db_inst_count;
	82	extern int db_load_count;
	83	extern int db_store_count;
	84
1c79356b A	85	void
	86	db_task_trap(
	87	int type,
	88	int code,
	89	boolean_t user_space)
	90	{
	91	jmp_buf_t db_jmpbuf;
	92	jmp_buf_t *prev;
	93	boolean_t bkpt;
	94	boolean_t watchpt;
	95	task_t task;
	96	task_t task_space;
	97
	98	task = db_current_task();
91447636	99	task_space = db_target_space(current_thread(), user_space);
1c79356b A	100	bkpt = IS_BREAKPOINT_TRAP(type, code);
	101	watchpt = IS_WATCHPOINT_TRAP(type, code);
	102
	103	/*
	104	* Note: we look up PC values in an address space (task_space),
	105	* but print symbols using a (task-specific) symbol table, found
	106	* using task.
	107	*/
89b3af67 A	108
	109	/* Elided since walking the thread/task lists before setting up
	110	* safe recovery points is incorrect, and could
	111	* potentially cause us to loop and fault indefinitely.
	112	*/
	113	#if 0
1c79356b	114	db_init_default_act();
89b3af67	115	#endif
1c79356b	116	db_check_breakpoint_valid();
89b3af67	117
1c79356b A	118	if (db_stop_at_pc(&bkpt, task, task_space)) {
	119	if (db_inst_count) {
	120	db_printf("After %d instructions (%d loads, %d stores),\n",
	121	db_inst_count, db_load_count, db_store_count);
	122	}
	123	if (bkpt)
	124	db_printf("Breakpoint at ");
	125	else if (watchpt)
	126	db_printf("Watchpoint at ");
	127	else
	128	db_printf("Stopped at ");
	129	db_dot = PC_REGS(DDB_REGS);
	130
	131	prev = db_recover;
	132	if (_setjmp(db_recover = &db_jmpbuf) == 0) {
	133	#if defined(__alpha)
	134	db_print_loc(db_dot, task_space);
	135	db_printf("\n\t");
	136	db_print_inst(db_dot, task_space);
	137	#else /* !defined(__alpha) */
	138	#if defined(__ppc__)
	139	db_print_loc_and_inst(db_dot, task_space);
	140	#else /* __ppc__ */
	141	db_print_loc_and_inst(db_dot, task);
	142	#endif /* __ppc__ */
	143	#endif /* defined(__alpha) */
	144	} else
91447636	145	db_printf("Trouble printing location %#llX.\n", (unsigned long long)db_dot);
1c79356b A	146	db_recover = prev;
	147
	148	db_command_loop();
	149	}
	150
	151	db_restart_at_pc(watchpt, task_space);
	152	}