xref: /illumos-gate/usr/src/uts/common/sys/panic.h (revision 3f11de9d)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
23  * Copyright (c) 2016 by Delphix. All rights reserved.
24  */
25 
26 #ifndef	_SYS_PANIC_H
27 #define	_SYS_PANIC_H
28 
29 #if !defined(_ASM)
30 #include <sys/types.h>
31 #include <sys/thread.h>
32 #include <sys/cpuvar.h>
33 #endif	/* !_ASM */
34 
35 #ifdef	__cplusplus
36 extern "C" {
37 #endif
38 
39 #ifdef _LP64
40 #define	PANICSTKSIZE	16384
41 #else
42 #define	PANICSTKSIZE	8192
43 #endif
44 
45 #define	PANICBUFSIZE	8192
46 #define	PANICBUFVERS	2
47 
48 #define	PANICNVNAMELEN	16
49 
50 #define	STACK_BUF_SIZE	2048
51 #define	SUMMARY_MAGIC	0xdead0d8a
52 
53 /*
54  * Panicbuf Format:
55  *
56  * The kernel records the formatted panic message and an optional array of
57  * name/value pairs into panicbuf[], a fixed-size buffer which is saved in
58  * the crash dump and, on some platforms, is persistent across reboots.
59  * The initial part of the buffer is a struct of type panic_data_t, which
60  * includes a version number for identifying the format of subsequent data.
61  *
62  * The pd_msgoff word identifies the byte offset into panicbuf[] at which the
63  * null-terminated panic message is located.  This is followed by an optional
64  * variable-sized array of panic_nv_t items, which are used to record CPU
65  * register values.  The number of items in pd_nvdata is computed as follows:
66  *
67  * (pd_msgoff - (sizeof (panic_data_t) - sizeof (panic_nv_t))) /
68  * 	sizeof (panic_nv_t);
69  *
70  * In addition to panicbuf, debuggers can access the panic_* variables shown
71  * below to determine more information about the initiator of the panic.
72  */
73 
74 #if !defined(_ASM)
75 
76 typedef struct panic_nv {
77 	char pnv_name[PANICNVNAMELEN];	/* String name */
78 	uint64_t pnv_value;		/* Value */
79 } panic_nv_t;
80 
81 typedef struct panic_data {
82 	uint32_t pd_version;		/* Version number of panic_data_t */
83 	uint32_t pd_msgoff;		/* Message byte offset in panicbuf */
84 	char pd_uuid[36 + 1];		/* image uuid */
85 	panic_nv_t pd_nvdata[1];	/* Array of named data */
86 } panic_data_t;
87 
88 typedef struct summary_dump {
89 	uint32_t sd_magic;		/* magic number */
90 	uint32_t sd_ssum;		/* checsksum32(stack buffer) */
91 	/*
92 	 * stack buffer and other summary data follow here -- see
93 	 * dump_summary()
94 	 */
95 } summary_dump_t;
96 
97 #if defined(_KERNEL)
98 
99 /*
100  * Kernel macros for adding information to pd_nvdata[].  PANICNVGET() returns
101  * a panic_nv_t pointer (pnv) after the end of the existing data, PANICNVADD()
102  * modifies the current item and increments pnv, and PANICNVSET() rewrites
103  * pd_msgoff to indicate the end of pd_nvdata[].
104  */
105 #define	PANICNVGET(pdp)							\
106 	((pdp)->pd_nvdata + (((pdp)->pd_msgoff -			\
107 	(sizeof (panic_data_t) - sizeof (panic_nv_t))) / sizeof (panic_nv_t)))
108 
109 #define	PANICNVADD(pnv, n, v)						\
110 	{								\
111 		(void) strncpy((pnv)->pnv_name, (n), PANICNVNAMELEN);	\
112 		(pnv)->pnv_value = (uint64_t)(v); (pnv)++;		\
113 	}
114 
115 #define	PANICNVSET(pdp, pnv) \
116 	(pdp)->pd_msgoff = (uint32_t)((char *)(pnv) - (char *)(pdp));
117 
118 /*
119  * Kernel panic data; preserved in crash dump for debuggers.
120  */
121 #pragma align 8(panicbuf)
122 extern char panicbuf[PANICBUFSIZE];
123 extern kthread_t *panic_thread;
124 extern cpu_t panic_cpu;
125 extern hrtime_t panic_hrtime;
126 extern timespec_t panic_hrestime;
127 
128 /*
129  * Forward declarations for types:
130  */
131 struct panic_trap_info;
132 struct regs;
133 
134 /*
135  * Miscellaneous state variables defined in or used by the panic code:
136  */
137 extern char *panic_bootstr;
138 extern int panic_bootfcn;
139 extern int panic_forced;
140 extern int halt_on_panic;
141 extern int nopanicdebug;
142 extern int do_polled_io;
143 extern int obpdebug;
144 extern int in_sync;
145 extern int panic_quiesce;
146 extern int panic_dump;
147 extern int64_t panic_lbolt64;
148 extern label_t panic_regs;
149 extern struct regs *panic_reg;
150 
151 /*
152  * Panic functions called from the common panic code which must be
153  * implemented by architecture or platform-specific code:
154  */
155 extern void panic_saveregs(panic_data_t *, struct regs *);
156 extern void panic_savetrap(panic_data_t *, struct panic_trap_info *);
157 extern void panic_showtrap(struct panic_trap_info *);
158 extern void panic_stopcpus(cpu_t *, kthread_t *, int);
159 extern void panic_enter_hw(int);
160 extern void panic_quiesce_hw(panic_data_t *);
161 extern void panic_dump_hw(int);
162 extern int panic_trigger(int *);
163 
164 #endif /* _KERNEL */
165 #endif /* !_ASM */
166 
167 #ifdef	__cplusplus
168 }
169 #endif
170 
171 #endif	/* _SYS_PANIC_H */
172