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, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright (c) 2000-2001 by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26 /*
27 * Copyright (c) 2012 by Delphix. All rights reserved.
28 */
29
30 #include <sys/thread.h>
31 #include "tsd.h"
32
33 /*
34 * Initialize the tsd walker by either using the given starting address,
35 * or reading the value of the kernel's tsd_list pointer.
36 */
37 int
tsd_walk_init(mdb_walk_state_t * wsp)38 tsd_walk_init(mdb_walk_state_t *wsp)
39 {
40 if (wsp->walk_addr == NULL &&
41 mdb_readvar(&wsp->walk_addr, "tsd_list") == -1) {
42 mdb_warn("failed to read 'tsd_list'");
43 return (WALK_ERR);
44 }
45
46 wsp->walk_data = mdb_alloc(sizeof (struct tsd_thread), UM_SLEEP);
47 return (WALK_NEXT);
48 }
49
50 int
tsd_walk_step(mdb_walk_state_t * wsp)51 tsd_walk_step(mdb_walk_state_t *wsp)
52 {
53 int status;
54
55 if (wsp->walk_addr == NULL)
56 return (WALK_DONE);
57
58 if (mdb_vread(wsp->walk_data,
59 sizeof (struct tsd_thread), wsp->walk_addr) == -1) {
60 mdb_warn("failed to read tsd at %p", wsp->walk_addr);
61 return (WALK_ERR);
62 }
63
64 status = wsp->walk_callback(wsp->walk_addr, wsp->walk_data,
65 wsp->walk_cbdata);
66
67 wsp->walk_addr =
68 (uintptr_t)(((struct tsd_thread *)wsp->walk_data)->ts_next);
69 return (status);
70 }
71
72 void
tsd_walk_fini(mdb_walk_state_t * wsp)73 tsd_walk_fini(mdb_walk_state_t *wsp)
74 {
75 mdb_free(wsp->walk_data, sizeof (struct tsd_thread));
76 }
77
78 /*
79 * Map from thread pointer to tsd pointer for given key
80 */
81 int
ttotsd(uintptr_t addr,uint_t flags,int argc,const mdb_arg_t * argv)82 ttotsd(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
83 {
84 kthread_t thread, *t = &thread;
85 struct tsd_thread tsdata, *ts = &tsdata;
86 uintptr_t key = NULL;
87 uintptr_t eladdr;
88 void *element = NULL;
89
90 if (mdb_getopts(argc, argv, 'k', MDB_OPT_UINTPTR, &key, NULL) != argc)
91 return (DCMD_USAGE);
92
93 if (!(flags & DCMD_ADDRSPEC) || key == NULL)
94 return (DCMD_USAGE);
95
96 if (mdb_vread(t, sizeof (*t), addr) == -1) {
97 mdb_warn("failed to read thread at %p", addr);
98 return (DCMD_ERR);
99 }
100
101 if (t->t_tsd == NULL)
102 goto out;
103
104 if (mdb_vread(ts, sizeof (*ts), (uintptr_t)t->t_tsd) == -1) {
105 mdb_warn("failed to read tsd at %p", t->t_tsd);
106 return (DCMD_ERR);
107 }
108
109 if (key > ts->ts_nkeys)
110 goto out;
111
112 eladdr = (uintptr_t)(ts->ts_value + key - 1);
113 if (mdb_vread(&element, sizeof (element), eladdr) == -1) {
114 mdb_warn("failed to read t->t_tsd[%d] at %p", key - 1, eladdr);
115 return (DCMD_ERR);
116 }
117
118 out:
119 if (element == NULL && (flags & DCMD_PIPE))
120 return (DCMD_OK);
121
122 mdb_printf("%p\n", element);
123 return (DCMD_OK);
124 }
125
126 static int
tsdthr_match(uintptr_t addr,const kthread_t * t,uintptr_t tsdaddr)127 tsdthr_match(uintptr_t addr, const kthread_t *t, uintptr_t tsdaddr)
128 {
129 /*
130 * Allow for multiple matches, even though that "can't happen."
131 */
132 if (tsdaddr == (uintptr_t)t->t_tsd)
133 mdb_printf("%p\n", addr);
134 return (WALK_NEXT);
135 }
136
137 /*
138 * Given a tsd pointer, find the owning thread
139 */
140 /*ARGSUSED*/
141 int
tsdtot(uintptr_t addr,uint_t flags,int argc,const mdb_arg_t * argv)142 tsdtot(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
143 {
144 if (addr == 0 || argc != 0)
145 return (DCMD_USAGE);
146 if (mdb_walk("thread", (mdb_walk_cb_t)tsdthr_match, (void *)addr) == -1)
147 return (DCMD_ERR);
148 return (DCMD_OK);
149 }
150