FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_thread.c
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2004 Marcel Moolenaar
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kdb.h>
35 #include <sys/proc.h>
36
37 #include <machine/pcb.h>
38
39 #include <ddb/ddb.h>
40 #include <ddb/db_command.h>
41 #include <ddb/db_sym.h>
42
43 void
44 db_print_thread(void)
45 {
46 pid_t pid;
47
48 pid = -1;
49 if (kdb_thread->td_proc != NULL)
50 pid = kdb_thread->td_proc->p_pid;
51 db_printf("[ thread pid %d tid %ld ]\n", pid, (long)kdb_thread->td_tid);
52 }
53
54 void
55 db_set_thread(db_expr_t tid, bool hastid, db_expr_t cnt, char *mod)
56 {
57 struct thread *thr;
58 int err;
59
60 if (hastid) {
61 thr = db_lookup_thread(tid, false);
62 if (thr != NULL) {
63 err = kdb_thr_select(thr);
64 if (err != 0) {
65 db_printf("unable to switch to thread %ld\n",
66 (long)thr->td_tid);
67 return;
68 }
69 db_dot = PC_REGS();
70 } else {
71 db_printf("%d: invalid thread\n", (int)tid);
72 return;
73 }
74 }
75
76 db_print_thread();
77 db_print_loc_and_inst(PC_REGS());
78 }
79
80 void
81 db_show_threads(db_expr_t addr, bool hasaddr, db_expr_t cnt, char *mod)
82 {
83 jmp_buf jb;
84 void *prev_jb;
85 struct thread *thr;
86
87 thr = kdb_thr_first();
88 while (!db_pager_quit && thr != NULL) {
89 db_printf(" %6ld (%p) (stack %p) ", (long)thr->td_tid, thr,
90 (void *)thr->td_kstack);
91 prev_jb = kdb_jmpbuf(jb);
92 if (setjmp(jb) == 0) {
93 if (thr->td_proc->p_flag & P_INMEM) {
94 if (db_trace_thread(thr, 1) != 0)
95 db_printf("***\n");
96 } else
97 db_printf("*** swapped out\n");
98 }
99 kdb_jmpbuf(prev_jb);
100 thr = kdb_thr_next(thr);
101 }
102 }
103
104 /*
105 * Lookup a thread based on a db expression address. We assume that the
106 * address was parsed in hexadecimal. We reparse the address in decimal
107 * first and try to treat it as a thread ID to find an associated thread.
108 * If that fails and check_pid is true, we treat the decimal value as a
109 * PID. If that matches a process, we return the first thread in that
110 * process. Otherwise, we treat the addr as a pointer to a thread.
111 */
112 struct thread *
113 db_lookup_thread(db_expr_t addr, bool check_pid)
114 {
115 struct thread *td;
116 db_expr_t decaddr;
117
118 /*
119 * If the parsed address was not a valid decimal expression,
120 * assume it is a thread pointer.
121 */
122 decaddr = db_hex2dec(addr);
123 if (decaddr == -1)
124 return ((struct thread *)addr);
125
126 td = kdb_thr_lookup(decaddr);
127 if (td != NULL)
128 return (td);
129 if (check_pid) {
130 td = kdb_thr_from_pid(decaddr);
131 if (td != NULL)
132 return (td);
133 }
134 return ((struct thread *)addr);
135 }
136
137 /*
138 * Lookup a process based on a db expression address. We assume that the
139 * address was parsed in hexadecimal. We reparse the address in decimal
140 * first and try to treat it as a PID to find an associated process.
141 * If that fails we treat the addr as a pointer to a process.
142 */
143 struct proc *
144 db_lookup_proc(db_expr_t addr)
145 {
146 db_expr_t decaddr;
147 struct proc *p;
148
149 decaddr = db_hex2dec(addr);
150 if (decaddr != -1) {
151 LIST_FOREACH(p, PIDHASH(decaddr), p_hash) {
152 if (p->p_pid == decaddr)
153 return (p);
154 }
155 }
156 return ((struct proc *)addr);
157 }
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