[apple/xnu.git] / osfmk / kern / xpr.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * @OSF_COPYRIGHT@
 */
/*
 * HISTORY
 * 
 * Revision 1.1.1.1  1998/09/22 21:05:32  wsanchez
 * Import of Mac OS X kernel (~semeria)
 *
 * Revision 1.1.1.1  1998/03/07 02:25:57  wsanchez
 * Import of OSF Mach kernel (~mburg)
 *
 * Revision 1.2.46.1  1997/09/22  17:41:21  barbou
 * 	MP+RT: protect cpu_number() usage against preemption.
 * 	[97/09/16            barbou]
 *
 * Revision 1.2.25.5  1996/07/31  09:56:06  paire
 * 	Merged with nmk20b7_shared (1.2.41.1)
 * 	[96/06/10            paire]
 * 
 * Revision 1.2.41.1  1996/04/15  14:35:12  bernadat
 * 	Keep interrupts disabled while accessing XPR_TIMESTAMP.
 * 	[96/04/12            bernadat]
 * 
 * Revision 1.2.25.4  1995/02/24  15:22:42  alanl
 * 	DIPC:  Merge from nmk17b2 to nmk18b8.
 * 	Notes:  Restore portable locks package, derived from nmk17b2.
 * 	[95/02/07            alanl]
 * 
 * Revision 1.2.28.3  1994/12/09  22:25:16  dwm
 * 	mk6 CR801 - merge up from nmk18b4 to nmk18b7
 * 	* Rev 1.2.25.2  1994/10/21  18:30:41  joe
 * 	  Added ETAP support
 * 	[1994/12/09  21:10:59  dwm]
 * 
 * Revision 1.2.28.2  1994/11/10  06:15:29  dwm
 * 	mk6 CR764 - s/spinlock/simple_lock/ (name change only)
 * 	[1994/11/10  05:58:48  dwm]
 * 
 * Revision 1.2.28.1  1994/11/04  10:10:56  dwm
 * 	mk6 CR668 - 1.3b26 merge
 * 	* Revision 1.2.5.7  1994/05/06  18:54:13  tmt
 * 	Merge in DEC Alpha changes to osc1.3b19.
 * 	include <mach/machine/vm_types.h>
 * 	64 bit cleanup.
 * 	* End1.3merge
 * 	[1994/11/04  09:39:17  dwm]
 * 
 * Revision 1.2.25.1  1994/09/23  02:32:39  ezf
 * 	change marker to not FREE
 * 	[1994/09/22  21:38:29  ezf]
 * 
 * Revision 1.2.22.1  1994/06/09  14:14:11  dswartz
 * 	Preemption merge.
 * 	[1994/06/09  14:08:38  dswartz]
 * 
 * Revision 1.2.5.5  1993/08/12  20:16:51  bernard
 * 	Last pass for ANSI prototypes - CR#9523
 * 	[1993/08/12  15:43:24  bernard]
 * 
 * Revision 1.2.5.4  1993/08/02  17:26:05  rod
 * 	ANSI prototypes:  zap explicit include of machine/setjmp.h.  CR #9523.
 * 	[1993/08/01  13:36:31  rod]
 * 
 * Revision 1.2.5.3  1993/07/27  18:09:05  rod
 * 	Add ANSI prototypes.  CR #9523.
 * 	[1993/07/27  14:33:23  rod]
 * 
 * Revision 1.2.5.2  1993/06/09  02:39:13  gm
 * 	CR9176 - ANSI C violations: trailing tokens on CPP
 * 	directives, extra semicolons after decl_ ..., asm keywords
 * 	[1993/06/07  19:07:51  jeffc]
 * 
 * 	Added to OSF/1 R1.3 from NMK15.0.
 * 	[1993/06/02  21:15:13  jeffc]
 * 
 * Revision 1.2  1993/04/19  16:31:21  devrcs
 * 	Added void to fcns that still needed it.
 * 	[93/02/05            bruel]
 * 
 * Revision 1.1  1992/09/30  02:10:39  robert
 * 	Initial revision
 * 
 * $EndLog$
 */
/* CMU_HIST */
/*
 * Revision 2.9.5.2  92/03/03  16:20:57  jeffreyh
 * 	Fix Log.
 * 	[92/02/24  13:24:44  jeffreyh]
 * 
 * Revision 2.9.5.1  92/02/18  19:13:03  jeffreyh
 * 	Added an xpr_search function to which you can give
 * 	a selection function.
 * 	[92/02/11  08:13:23  bernadat]
 * 
 * Revision 2.9.4.1  92/02/13  18:53:47  jeffreyh
 * 	Added an xpr_search function to which you can give
 * 	a selection function.
 * 	[92/02/11  08:13:23  bernadat]
 * 
 * Revision 2.9.3.1  92/02/11  17:19:59  jeffreyh
 * 	Added an xpr_search function to which you can give
 * 	a selection function.
 * 	[92/02/11  08:13:23  bernadat]
 * 
 * Revision 2.9.2.1  92/02/11  08:13:23  bernadat
 * 	Added an xpr_search function to which you can give
 * 	a selection function.
 * 
 * 
 * Revision 2.9  91/10/09  16:11:50  af
 * 	Removed xpr_save.  Modified xpr_dump to make it useful
 * 	for dumping xpr buffers in user space tasks.
 * 	[91/09/20            rpd]
 * 
 * 	Turned on xprenable by default.  xprbootstrap now preserves
 * 	the original contents of the buffer if xprenable is off.
 * 	[91/09/18            rpd]
 * 
 * Revision 2.8  91/08/28  11:14:56  jsb
 * 	Fixed xprbootstrap to zero the allocate memory.
 * 	[91/08/18            rpd]
 * 
 * Revision 2.7  91/05/18  14:34:37  rpd
 * 	Added xprenable and other minor changes so that the xpr buffer
 * 	may be examined after a spontaneous reboot.
 * 	[91/05/03            rpd]
 * 	Fixed the initialization check in xpr.
 * 	Fixed xpr_dump.
 * 	[91/04/02            rpd]
 * 
 * Revision 2.6  91/05/14  16:50:09  mrt
 * 	Correcting copyright
 * 
 * Revision 2.5  91/03/16  14:53:24  rpd
 * 	Updated for new kmem_alloc interface.
 * 	[91/03/03            rpd]
 * 
 * Revision 2.4  91/02/05  17:31:13  mrt
 * 	Changed to new Mach copyright
 * 	[91/02/01  16:21:17  mrt]
 * 
 * Revision 2.3  90/09/09  14:33:04  rpd
 * 	Use decl_simple_lock_data.
 * 	[90/08/30            rpd]
 * 
 * Revision 2.2  89/11/29  14:09:21  af
 * 	Added xpr_dump() to print on console the content of the buffer,
 * 	only valid for KDB usage.
 * 	[89/11/12            af]
 * 
 * 	MACH_KERNEL: include sys/cpu_number.h instead of machine/cpu.h.
 * 	Clean up comments.
 * 	[88/12/19            dbg]
 * 
 * Revision 2.1  89/08/03  15:49:11  rwd
 * Created.
 * 
 * Revision 2.2  88/12/19  02:48:30  mwyoung
 * 	Fix include file references.
 * 	[88/11/22  02:17:01  mwyoung]
 * 	
 * 	Separate initialization into two phases.
 * 	[88/11/22  01:13:11  mwyoung]
 * 
 *  6-Jan-88  Michael Young (mwyoung) at Carnegie-Mellon University
 *	Eliminate use of arg6 in order to allow a more shapely event structure.
 *
 * 30-Dec-87  David Golub (dbg) at Carnegie-Mellon University
 *	Delinted.
 *
 *  7-Dec-87  Richard Sanzi (sanzi) at Carnegie-Mellon University
 *	Added xpr_save() routine.
 *
 */ 
/* CMU_ENDHIST */
/* 
 * Mach Operating System
 * Copyright (c) 1991,1990,1989,1988,1987 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.
 */
#include <mach_kdb.h>
/*
 * xpr silent tracing circular buffer.
 */

#include <cpus.h>

#include <mach/machine/vm_types.h>
#include <kern/xpr.h>
#include <kern/lock.h>
#include <kern/spl.h>
#include <kern/cpu_number.h>
#include <kern/misc_protos.h>
#include <kern/thread.h>
#include <vm/vm_kern.h>
#include <string.h>

/*
 *	After a spontaneous reboot, it is desirable to look
 *	at the old xpr buffer.  Assuming xprbootstrap allocates
 *	the buffer in the same place in physical memory and
 *	the reboot doesn't clear memory, this should work.
 *	xprptr will be reset, but the saved value should be OK.
 *	Just set xprenable false so the buffer isn't overwritten.
 */

decl_simple_lock_data(,xprlock)
boolean_t xprenable = TRUE;	/* Enable xpr tracing */
int nxprbufs = 0;	/* Number of contiguous xprbufs allocated */
int xprflags = 0;	/* Bit mask of xpr flags enabled */
struct xprbuf *xprbase;	/* Pointer to circular buffer nxprbufs*sizeof(xprbuf)*/
struct xprbuf *xprptr;	/* Currently allocated xprbuf */
struct xprbuf *xprlast;	/* Pointer to end of circular buffer */

void
xpr(
	char	*msg,
	long	arg1,
	long	arg2,
	long	arg3,
	long	arg4,
	long	arg5)
{
	spl_t s;
	register struct xprbuf *x;

	/* If we aren't initialized, ignore trace request */
	if (!xprenable || (xprptr == 0))
		return;
	/* Guard against all interrupts and allocate next buffer. */

	s = splhigh();
	simple_lock(&xprlock);
	x = xprptr++;
	if (xprptr >= xprlast) {
		/* wrap around */
		xprptr = xprbase;
	}
	/* Save xprptr in allocated memory. */
	*(struct xprbuf **)xprlast = xprptr;
	simple_unlock(&xprlock);
	x->timestamp = XPR_TIMESTAMP;
	splx(s);
	x->msg = msg;
	x->arg1 = arg1;
	x->arg2 = arg2;
	x->arg3 = arg3;
	x->arg4 = arg4;
	x->arg5 = arg5;
	mp_disable_preemption();
	x->cpuinfo = cpu_number();
	mp_enable_preemption();
}

void 
xprbootstrap(void)
{
	vm_offset_t	addr;
	vm_size_t	size;
	kern_return_t	kr;

	simple_lock_init(&xprlock, ETAP_MISC_XPR);
	if (nxprbufs == 0)
		return;	/* assume XPR support not desired */

	/* leave room at the end for a saved copy of xprptr */
	size = nxprbufs * sizeof(struct xprbuf) + sizeof xprptr;

	kr = kmem_alloc_wired(kernel_map, &addr, size);
	if (kr != KERN_SUCCESS)
		panic("xprbootstrap");

	if (xprenable) {
		/*
		 *	If xprenable is set (the default) then we zero
		 *	the buffer so xpr_dump doesn't encounter bad pointers.
		 *	If xprenable isn't set, then we preserve
		 *	the original contents of the buffer.  This is useful
		 *	if memory survives reboots, so xpr_dump can show
		 *	the previous buffer contents.
		 */

		(void) memset((void *) addr, 0, size);
	}

	xprbase = (struct xprbuf *) addr;
	xprlast = &xprbase[nxprbufs];
	xprptr = xprbase;	/* setting xprptr enables tracing */
}

int		xprinitial = 0;

void
xprinit(void)
{
	xprflags |= xprinitial;
}

#if	MACH_KDB
#include <ddb/db_output.h>

/*
 * Prototypes for functions called from the debugger
 */
void
xpr_dump(
	struct xprbuf	*base,
	int		nbufs);

void
xpr_search(
	int	arg_index,
	int	value);

extern jmp_buf_t *db_recover;

/*
 *	Print current content of xpr buffers (KDB's sake)
 *	Use stack order to make it understandable.
 *
 *	Called as "!xpr_dump" this dumps the kernel's xpr buffer.
 *	Called with arguments, it can dump xpr buffers in user tasks,
 *	assuming they use the same format as the kernel.
 */
void
xpr_dump(
	struct xprbuf	*base,
	int		nbufs)
{
	jmp_buf_t db_jmpbuf;
	jmp_buf_t *prev;
	struct xprbuf *last, *ptr;
	register struct xprbuf *x;
	int i;
	spl_t s;

	if (base == 0) {
		base = xprbase;
		nbufs = nxprbufs;
	}

	if (nbufs == 0)
		return;

	if (base == xprbase) {
		s = splhigh();
		simple_lock(&xprlock);
	}

	last = base + nbufs;
	ptr = * (struct xprbuf **) last;

	prev = db_recover;
	if (_setjmp(db_recover = &db_jmpbuf) == 0)
	    for (x = ptr, i = 0; i < nbufs; i++) {
		if (--x < base)
			x = last - 1;

		if (x->msg == 0)
			break;

		db_printf("<%d:%x:%x> ", x - base, x->cpuinfo, x->timestamp);
		db_printf(x->msg, x->arg1,x->arg2,x->arg3,x->arg4,x->arg5);
	    }
	db_recover = prev;

	if (base == xprbase) {
		simple_unlock(&xprlock);
		splx(s);
	}
}

/*
 * dump xpr table with a selection criteria.
 * argument number "arg_index" must equal "value"
 */

void
xpr_search(
	int	arg_index,
	int	value)
{
	jmp_buf_t db_jmpbuf;
	jmp_buf_t *prev;
	register struct xprbuf *x;
	spl_t s;
	int n;

	if (!nxprbufs)
		return;

	n = nxprbufs;

	s = splhigh();
	simple_lock(&xprlock);

	prev = db_recover;
	if (_setjmp(db_recover = &db_jmpbuf) == 0)
  	    for (x = *(struct xprbuf **)xprlast ; n--; ) {
		if (--x < xprbase)
			x = xprlast - 1;

		if (x->msg == 0) {
			break;
		}

		if (*((&x->arg1)+arg_index) != value)
			continue;

		db_printf("<%d:%d:%x> ", x - xprbase,
			  x->cpuinfo, x->timestamp);
		db_printf(x->msg, x->arg1,x->arg2,x->arg3,x->arg4,x->arg5);
	    }
	db_recover = prev;

	simple_unlock(&xprlock);
	splx(s);
}
#endif	/* MACH_KDB */
Commit	Line	Data
1c79356b A	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	* HISTORY
	27	*
	28	* Revision 1.1.1.1 1998/09/22 21:05:32 wsanchez
	29	* Import of Mac OS X kernel (~semeria)
	30	*
	31	* Revision 1.1.1.1 1998/03/07 02:25:57 wsanchez
	32	* Import of OSF Mach kernel (~mburg)
	33	*
	34	* Revision 1.2.46.1 1997/09/22 17:41:21 barbou
	35	* MP+RT: protect cpu_number() usage against preemption.
	36	* [97/09/16 barbou]
	37	*
	38	* Revision 1.2.25.5 1996/07/31 09:56:06 paire
	39	* Merged with nmk20b7_shared (1.2.41.1)
	40	* [96/06/10 paire]
	41	*
	42	* Revision 1.2.41.1 1996/04/15 14:35:12 bernadat
	43	* Keep interrupts disabled while accessing XPR_TIMESTAMP.
	44	* [96/04/12 bernadat]
	45	*
	46	* Revision 1.2.25.4 1995/02/24 15:22:42 alanl
	47	* DIPC: Merge from nmk17b2 to nmk18b8.
	48	* Notes: Restore portable locks package, derived from nmk17b2.
	49	* [95/02/07 alanl]
	50	*
	51	* Revision 1.2.28.3 1994/12/09 22:25:16 dwm
	52	* mk6 CR801 - merge up from nmk18b4 to nmk18b7
	53	* * Rev 1.2.25.2 1994/10/21 18:30:41 joe
	54	* Added ETAP support
	55	* [1994/12/09 21:10:59 dwm]
	56	*
	57	* Revision 1.2.28.2 1994/11/10 06:15:29 dwm
	58	* mk6 CR764 - s/spinlock/simple_lock/ (name change only)
	59	* [1994/11/10 05:58:48 dwm]
	60	*
	61	* Revision 1.2.28.1 1994/11/04 10:10:56 dwm
	62	* mk6 CR668 - 1.3b26 merge
	63	* * Revision 1.2.5.7 1994/05/06 18:54:13 tmt
	64	* Merge in DEC Alpha changes to osc1.3b19.
65	* include <mach/machine/vm_types.h>
66	* 64 bit cleanup.
67	* * End1.3merge
68	* [1994/11/04 09:39:17 dwm]
69	*
70	* Revision 1.2.25.1 1994/09/23 02:32:39 ezf
71	* change marker to not FREE
72	* [1994/09/22 21:38:29 ezf]
73	*
74	* Revision 1.2.22.1 1994/06/09 14:14:11 dswartz
75	* Preemption merge.
76	* [1994/06/09 14:08:38 dswartz]
77	*
78	* Revision 1.2.5.5 1993/08/12 20:16:51 bernard
79	* Last pass for ANSI prototypes - CR#9523
80	* [1993/08/12 15:43:24 bernard]
81	*
82	* Revision 1.2.5.4 1993/08/02 17:26:05 rod
83	* ANSI prototypes: zap explicit include of machine/setjmp.h. CR #9523.
84	* [1993/08/01 13:36:31 rod]
85	*
86	* Revision 1.2.5.3 1993/07/27 18:09:05 rod
87	* Add ANSI prototypes. CR #9523.
88	* [1993/07/27 14:33:23 rod]
89	*
90	* Revision 1.2.5.2 1993/06/09 02:39:13 gm
91	* CR9176 - ANSI C violations: trailing tokens on CPP
92	* directives, extra semicolons after decl_ ..., asm keywords
93	* [1993/06/07 19:07:51 jeffc]
94	*
95	* Added to OSF/1 R1.3 from NMK15.0.
96	* [1993/06/02 21:15:13 jeffc]
97	*
98	* Revision 1.2 1993/04/19 16:31:21 devrcs
99	* Added void to fcns that still needed it.
100	* [93/02/05 bruel]
101	*
102	* Revision 1.1 1992/09/30 02:10:39 robert
103	* Initial revision
104	*
105	* $EndLog$
106	*/
107	/* CMU_HIST */
108	/*
109	* Revision 2.9.5.2 92/03/03 16:20:57 jeffreyh
110	* Fix Log.
111	* [92/02/24 13:24:44 jeffreyh]
112	*
113	* Revision 2.9.5.1 92/02/18 19:13:03 jeffreyh
114	* Added an xpr_search function to which you can give
115	* a selection function.
116	* [92/02/11 08:13:23 bernadat]
117	*
118	* Revision 2.9.4.1 92/02/13 18:53:47 jeffreyh
119	* Added an xpr_search function to which you can give
120	* a selection function.
121	* [92/02/11 08:13:23 bernadat]
122	*
123	* Revision 2.9.3.1 92/02/11 17:19:59 jeffreyh
124	* Added an xpr_search function to which you can give
125	* a selection function.
126	* [92/02/11 08:13:23 bernadat]
127	*
128	* Revision 2.9.2.1 92/02/11 08:13:23 bernadat
129	* Added an xpr_search function to which you can give
130	* a selection function.
131	*
132	*
133	* Revision 2.9 91/10/09 16:11:50 af
134	* Removed xpr_save. Modified xpr_dump to make it useful
135	* for dumping xpr buffers in user space tasks.
136	* [91/09/20 rpd]
137	*
138	* Turned on xprenable by default. xprbootstrap now preserves
139	* the original contents of the buffer if xprenable is off.
140	* [91/09/18 rpd]
141	*
142	* Revision 2.8 91/08/28 11:14:56 jsb
143	* Fixed xprbootstrap to zero the allocate memory.
144	* [91/08/18 rpd]
145	*
146	* Revision 2.7 91/05/18 14:34:37 rpd
147	* Added xprenable and other minor changes so that the xpr buffer
148	* may be examined after a spontaneous reboot.
149	* [91/05/03 rpd]
150	* Fixed the initialization check in xpr.
151	* Fixed xpr_dump.
152	* [91/04/02 rpd]
153	*
154	* Revision 2.6 91/05/14 16:50:09 mrt
155	* Correcting copyright
156	*
157	* Revision 2.5 91/03/16 14:53:24 rpd
158	* Updated for new kmem_alloc interface.
159	* [91/03/03 rpd]
160	*
161	* Revision 2.4 91/02/05 17:31:13 mrt
162	* Changed to new Mach copyright
163	* [91/02/01 16:21:17 mrt]
164	*
165	* Revision 2.3 90/09/09 14:33:04 rpd
166	* Use decl_simple_lock_data.
167	* [90/08/30 rpd]
168	*
169	* Revision 2.2 89/11/29 14:09:21 af
170	* Added xpr_dump() to print on console the content of the buffer,
171	* only valid for KDB usage.
172	* [89/11/12 af]
173	*
174	* MACH_KERNEL: include sys/cpu_number.h instead of machine/cpu.h.
175	* Clean up comments.
176	* [88/12/19 dbg]
177	*
178	* Revision 2.1 89/08/03 15:49:11 rwd
179	* Created.
180	*
181	* Revision 2.2 88/12/19 02:48:30 mwyoung
182	* Fix include file references.
183	* [88/11/22 02:17:01 mwyoung]
184	*
185	* Separate initialization into two phases.
186	* [88/11/22 01:13:11 mwyoung]
187	*
188	* 6-Jan-88 Michael Young (mwyoung) at Carnegie-Mellon University
189	* Eliminate use of arg6 in order to allow a more shapely event structure.
190	*
191	* 30-Dec-87 David Golub (dbg) at Carnegie-Mellon University
192	* Delinted.
193	*
194	* 7-Dec-87 Richard Sanzi (sanzi) at Carnegie-Mellon University
195	* Added xpr_save() routine.
196	*
197	*/
198	/* CMU_ENDHIST */
199	/*
200	* Mach Operating System
201	* Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
202	* All Rights Reserved.
203	*
204	* Permission to use, copy, modify and distribute this software and its
205	* documentation is hereby granted, provided that both the copyright
206	* notice and this permission notice appear in all copies of the
207	* software, derivative works or modified versions, and any portions
208	* thereof, and that both notices appear in supporting documentation.
209	*
210	* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
211	* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
212	* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
213	*
214	* Carnegie Mellon requests users of this software to return to
215	*
216	* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
217	* School of Computer Science
218	* Carnegie Mellon University
219	* Pittsburgh PA 15213-3890
220	*
221	* any improvements or extensions that they make and grant Carnegie Mellon
222	* the rights to redistribute these changes.
223	*/
224	#include <mach_kdb.h>
225	/*
226	* xpr silent tracing circular buffer.
227	*/
228
229	#include <cpus.h>
230
231	#include <mach/machine/vm_types.h>
232	#include <kern/xpr.h>
233	#include <kern/lock.h>
234	#include <kern/spl.h>
235	#include <kern/cpu_number.h>
236	#include <kern/misc_protos.h>
237	#include <kern/thread.h>
238	#include <vm/vm_kern.h>
239	#include <string.h>
240
241	/*
242	* After a spontaneous reboot, it is desirable to look
243	* at the old xpr buffer. Assuming xprbootstrap allocates
244	* the buffer in the same place in physical memory and
245	* the reboot doesn't clear memory, this should work.
246	* xprptr will be reset, but the saved value should be OK.
247	* Just set xprenable false so the buffer isn't overwritten.
248	*/
249
250	decl_simple_lock_data(,xprlock)
251	boolean_t xprenable = TRUE; /* Enable xpr tracing */
252	int nxprbufs = 0; /* Number of contiguous xprbufs allocated */
253	int xprflags = 0; /* Bit mask of xpr flags enabled */
254	struct xprbuf xprbase; / Pointer to circular buffer nxprbufssizeof(xprbuf)/
255	struct xprbuf xprptr; / Currently allocated xprbuf */
256	struct xprbuf xprlast; / Pointer to end of circular buffer */
257
258	void
259	xpr(
260	char *msg,
261	long arg1,
262	long arg2,
263	long arg3,
264	long arg4,
265	long arg5)
266	{
267	spl_t s;
268	register struct xprbuf *x;
269
270	/* If we aren't initialized, ignore trace request */
271	if (!xprenable \|\| (xprptr == 0))
272	return;
273	/* Guard against all interrupts and allocate next buffer. */
274
275	s = splhigh();
276	simple_lock(&xprlock);
277	x = xprptr++;
278	if (xprptr >= xprlast) {
279	/* wrap around */
280	xprptr = xprbase;
281	}
282	/* Save xprptr in allocated memory. */
283	(struct xprbuf *)xprlast = xprptr;
284	simple_unlock(&xprlock);
285	x->timestamp = XPR_TIMESTAMP;
286	splx(s);
287	x->msg = msg;
288	x->arg1 = arg1;
289	x->arg2 = arg2;
290	x->arg3 = arg3;
291	x->arg4 = arg4;
292	x->arg5 = arg5;
293	mp_disable_preemption();
294	x->cpuinfo = cpu_number();
295	mp_enable_preemption();
296	}
297
298	void
299	xprbootstrap(void)
300	{
301	vm_offset_t addr;
302	vm_size_t size;
303	kern_return_t kr;
304
305	simple_lock_init(&xprlock, ETAP_MISC_XPR);
306	if (nxprbufs == 0)
307	return; /* assume XPR support not desired */
308
309	/* leave room at the end for a saved copy of xprptr */
310	size = nxprbufs * sizeof(struct xprbuf) + sizeof xprptr;
311
312	kr = kmem_alloc_wired(kernel_map, &addr, size);
313	if (kr != KERN_SUCCESS)
314	panic("xprbootstrap");
315
316	if (xprenable) {
317	/*
318	* If xprenable is set (the default) then we zero
319	* the buffer so xpr_dump doesn't encounter bad pointers.
320	* If xprenable isn't set, then we preserve
321	* the original contents of the buffer. This is useful
322	* if memory survives reboots, so xpr_dump can show
323	* the previous buffer contents.
324	*/
325
326	(void) memset((void *) addr, 0, size);
327	}
328
329	xprbase = (struct xprbuf *) addr;
330	xprlast = &xprbase[nxprbufs];
331	xprptr = xprbase; /* setting xprptr enables tracing */
332	}
333
334	int xprinitial = 0;
335
336	void
337	xprinit(void)
338	{
339	xprflags \|= xprinitial;
340	}
341
342	#if MACH_KDB
343	#include <ddb/db_output.h>
344
345	/*
346	* Prototypes for functions called from the debugger
347	*/
348	void
349	xpr_dump(
350	struct xprbuf *base,
351	int nbufs);
352
353	void
354	xpr_search(
355	int arg_index,
356	int value);
357
358	extern jmp_buf_t *db_recover;
359
360	/*
361	* Print current content of xpr buffers (KDB's sake)
362	* Use stack order to make it understandable.
363	*
364	* Called as "!xpr_dump" this dumps the kernel's xpr buffer.
365	* Called with arguments, it can dump xpr buffers in user tasks,
366	* assuming they use the same format as the kernel.
367	*/
368	void
369	xpr_dump(
370	struct xprbuf *base,
371	int nbufs)
372	{
373	jmp_buf_t db_jmpbuf;
374	jmp_buf_t *prev;
375	struct xprbuf last, ptr;
376	register struct xprbuf *x;
377	int i;
378	spl_t s;
379
380	if (base == 0) {
381	base = xprbase;
382	nbufs = nxprbufs;
383	}
384
385	if (nbufs == 0)
386	return;
387
388	if (base == xprbase) {
389	s = splhigh();
390	simple_lock(&xprlock);
391	}
392
393	last = base + nbufs;
394	ptr = * (struct xprbuf **) last;
395
396	prev = db_recover;
397	if (_setjmp(db_recover = &db_jmpbuf) == 0)
398	for (x = ptr, i = 0; i < nbufs; i++) {
399	if (--x < base)
400	x = last - 1;
401
402	if (x->msg == 0)
403	break;
404
405	db_printf("<%d:%x:%x> ", x - base, x->cpuinfo, x->timestamp);
406	db_printf(x->msg, x->arg1,x->arg2,x->arg3,x->arg4,x->arg5);
407	}
408	db_recover = prev;
409
410	if (base == xprbase) {
411	simple_unlock(&xprlock);
412	splx(s);
413	}
414	}
415
416	/*
417	* dump xpr table with a selection criteria.
418	* argument number "arg_index" must equal "value"
419	*/
420
421	void
422	xpr_search(
423	int arg_index,
424	int value)
425	{
426	jmp_buf_t db_jmpbuf;
427	jmp_buf_t *prev;
428	register struct xprbuf *x;
429	spl_t s;
430	int n;
431
432	if (!nxprbufs)
433	return;
434
435	n = nxprbufs;
436
437	s = splhigh();
438	simple_lock(&xprlock);
439
440	prev = db_recover;
441	if (_setjmp(db_recover = &db_jmpbuf) == 0)
442	for (x = (struct xprbuf *)xprlast ; n--; ) {
443	if (--x < xprbase)
444	x = xprlast - 1;
445
446	if (x->msg == 0) {
447	break;
448	}
449
450	if (*((&x->arg1)+arg_index) != value)
451	continue;
452
453	db_printf("<%d:%d:%x> ", x - xprbase,
454	x->cpuinfo, x->timestamp);
455	db_printf(x->msg, x->arg1,x->arg2,x->arg3,x->arg4,x->arg5);
456	}
457	db_recover = prev;
458
459	simple_unlock(&xprlock);
460	splx(s);
461	}
462	#endif /* MACH_KDB */