1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/param.h>
30 #include <sys/systm.h>
31 #include <sys/kdb.h>
32 #include <sys/proc.h>
33
34 #include <machine/pcb.h>
35
36 #include <ddb/ddb.h>
37 #include <ddb/db_command.h>
38 #include <ddb/db_sym.h>
39
40 void
db_print_thread(void)41 db_print_thread(void)
42 {
43 pid_t pid;
44
45 pid = -1;
46 if (kdb_thread->td_proc != NULL)
47 pid = kdb_thread->td_proc->p_pid;
48 db_printf("[ thread pid %d tid %ld ]\n", pid, (long)kdb_thread->td_tid);
49 }
50
51 void
db_set_thread(db_expr_t tid,bool hastid,db_expr_t cnt,char * mod)52 db_set_thread(db_expr_t tid, bool hastid, db_expr_t cnt, char *mod)
53 {
54 struct thread *thr;
55 int err;
56
57 if (hastid) {
58 thr = db_lookup_thread(tid, false);
59 if (thr != NULL) {
60 err = kdb_thr_select(thr);
61 if (err != 0) {
62 db_printf("unable to switch to thread %ld\n",
63 (long)thr->td_tid);
64 return;
65 }
66 db_dot = PC_REGS();
67 } else {
68 db_printf("%d: invalid thread\n", (int)tid);
69 return;
70 }
71 }
72
73 db_print_thread();
74 db_print_loc_and_inst(PC_REGS());
75 }
76
77 void
db_show_threads(db_expr_t addr,bool hasaddr,db_expr_t cnt,char * mod)78 db_show_threads(db_expr_t addr, bool hasaddr, db_expr_t cnt, char *mod)
79 {
80 jmp_buf jb;
81 void *prev_jb;
82 struct thread *thr;
83
84 thr = kdb_thr_first();
85 while (!db_pager_quit && thr != NULL) {
86 db_printf(" %6ld (%p) (stack %p) ", (long)thr->td_tid, thr,
87 (void *)thr->td_kstack);
88 prev_jb = kdb_jmpbuf(jb);
89 if (setjmp(jb) == 0) {
90 if (thr->td_proc->p_flag & P_INMEM) {
91 if (db_trace_thread(thr, 1) != 0)
92 db_printf("***\n");
93 } else
94 db_printf("*** swapped out\n");
95 }
96 kdb_jmpbuf(prev_jb);
97 thr = kdb_thr_next(thr);
98 }
99 }
100
101 /*
102 * Lookup a thread based on a db expression address. We assume that the
103 * address was parsed in hexadecimal. We reparse the address in decimal
104 * first and try to treat it as a thread ID to find an associated thread.
105 * If that fails and check_pid is true, we treat the decimal value as a
106 * PID. If that matches a process, we return the first thread in that
107 * process. Otherwise, we treat the addr as a pointer to a thread.
108 */
109 struct thread *
db_lookup_thread(db_expr_t addr,bool check_pid)110 db_lookup_thread(db_expr_t addr, bool check_pid)
111 {
112 struct thread *td;
113 db_expr_t decaddr;
114
115 /*
116 * If the parsed address was not a valid decimal expression,
117 * assume it is a thread pointer.
118 */
119 decaddr = db_hex2dec(addr);
120 if (decaddr == -1)
121 return ((struct thread *)addr);
122
123 td = kdb_thr_lookup(decaddr);
124 if (td != NULL)
125 return (td);
126 if (check_pid) {
127 td = kdb_thr_from_pid(decaddr);
128 if (td != NULL)
129 return (td);
130 }
131 return ((struct thread *)addr);
132 }
133
134 /*
135 * Lookup a process based on a db expression address. We assume that the
136 * address was parsed in hexadecimal. We reparse the address in decimal
137 * first and try to treat it as a PID to find an associated process.
138 * If that fails we treat the addr as a pointer to a process.
139 */
140 struct proc *
db_lookup_proc(db_expr_t addr)141 db_lookup_proc(db_expr_t addr)
142 {
143 db_expr_t decaddr;
144 struct proc *p;
145
146 decaddr = db_hex2dec(addr);
147 if (decaddr != -1) {
148 LIST_FOREACH(p, PIDHASH(decaddr), p_hash) {
149 if (p->p_pid == decaddr)
150 return (p);
151 }
152 }
153 return ((struct proc *)addr);
154 }
155