xref: /titanic_41/usr/src/uts/common/sys/fasttrap.h (revision ac448965596bc1c42f7accb3023f48d5fa9b8180)
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 /*
23  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #ifndef	_SYS_FASTTRAP_H
28 #define	_SYS_FASTTRAP_H
29 
30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
31 
32 #include <sys/fasttrap_isa.h>
33 #include <sys/dtrace.h>
34 #include <sys/types.h>
35 
36 #ifdef	__cplusplus
37 extern "C" {
38 #endif
39 
40 #define	FASTTRAPIOC		(('m' << 24) | ('r' << 16) | ('f' << 8))
41 #define	FASTTRAPIOC_MAKEPROBE	(FASTTRAPIOC | 1)
42 #define	FASTTRAPIOC_GETINSTR	(FASTTRAPIOC | 2)
43 
44 typedef enum fasttrap_probe_type {
45 	DTFTP_NONE = 0,
46 	DTFTP_ENTRY,
47 	DTFTP_RETURN,
48 	DTFTP_OFFSETS,
49 	DTFTP_POST_OFFSETS,
50 	DTFTP_IS_ENABLED
51 } fasttrap_probe_type_t;
52 
53 typedef struct fasttrap_probe_spec {
54 	pid_t			ftps_pid;
55 	fasttrap_probe_type_t	ftps_type;
56 
57 	char			ftps_func[DTRACE_FUNCNAMELEN];
58 	char			ftps_mod[DTRACE_MODNAMELEN];
59 
60 	uint64_t		ftps_pc;
61 	uint64_t		ftps_size;
62 	uint64_t		ftps_noffs;
63 	uint64_t		ftps_offs[1];
64 } fasttrap_probe_spec_t;
65 
66 typedef struct fasttrap_instr_query {
67 	uint64_t		ftiq_pc;
68 	pid_t			ftiq_pid;
69 	fasttrap_instr_t	ftiq_instr;
70 } fasttrap_instr_query_t;
71 
72 /*
73  * To support the fasttrap provider from very early in a process's life,
74  * the run-time linker, ld.so.1, has a program header of type PT_SUNWDTRACE
75  * which points to a data object which must be PT_SUNWDTRACE_SIZE bytes.
76  * This structure mimics the fasttrap provider section of the ulwp_t structure.
77  * When the fasttrap provider is changed to require new or different
78  * instructions, the data object in ld.so.1 and the thread initializers in libc
79  * (libc_init() and _thrp_create()) need to be updated to include the new
80  * instructions, and PT_SUNWDTRACE needs to be changed to a new unique number
81  * (while the old value gets assigned something like PT_SUNWDTRACE_1). Since the
82  * linker must be backward compatible with old Solaris releases, it must have
83  * program headers for each of the PT_SUNWDTRACE versions. The kernel's
84  * elfexec() function only has to look for the latest version of the
85  * PT_SUNWDTRACE program header.
86  */
87 #define	PT_SUNWDTRACE_SIZE	FASTTRAP_SUNWDTRACE_SIZE
88 
89 #ifdef	__cplusplus
90 }
91 #endif
92 
93 #endif	/* _SYS_FASTTRAP_H */
94