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
40void
41db_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
51void
52db_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
77void
78db_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 */
109struct thread *
110db_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 */
140struct proc *
141db_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