1/*-
2 * Copyright (c) 2004 Marcel Moolenaar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/kdb.h>
33#include <sys/proc.h>
34
35#include <machine/pcb.h>
36
37#include <ddb/ddb.h>
38#include <ddb/db_command.h>
39#include <ddb/db_sym.h>
40
41void
42db_print_thread(void)
43{
44	pid_t pid;
45
46	pid = -1;
47	if (kdb_thread->td_proc != NULL)
48		pid = kdb_thread->td_proc->p_pid;
49	db_printf("[ thread pid %d tid %ld ]\n", pid, (long)kdb_thread->td_tid);
50}
51
52void
53db_set_thread(db_expr_t tid, boolean_t hastid, db_expr_t cnt, char *mod)
54{
55	struct thread *thr;
56	db_expr_t radix;
57	int err;
58
59	/*
60	 * We parse our own arguments. We don't like the default radix.
61	 */
62	radix = db_radix;
63	db_radix = 10;
64	hastid = db_expression(&tid);
65	db_radix = radix;
66	db_skip_to_eol();
67
68	if (hastid) {
69		thr = kdb_thr_lookup(tid);
70		if (thr != NULL) {
71			err = kdb_thr_select(thr);
72			if (err != 0) {
73				db_printf("unable to switch to thread %ld\n",
74				    (long)thr->td_tid);
75				return;
76			}
77			db_dot = PC_REGS();
78		} else {
79			db_printf("%d: invalid thread\n", (int)tid);
80			return;
81		}
82	}
83
84	db_print_thread();
85	db_print_loc_and_inst(PC_REGS());
86}
87
88void
89db_show_threads(db_expr_t addr, boolean_t hasaddr, db_expr_t cnt, char *mod)
90{
91	jmp_buf jb;
92	void *prev_jb;
93	struct thread *thr;
94
95	thr = kdb_thr_first();
96	while (!db_pager_quit && thr != NULL) {
97		db_printf("  %6ld (%p) (stack %p)  ", (long)thr->td_tid, thr,
98		    (void *)thr->td_kstack);
99		prev_jb = kdb_jmpbuf(jb);
100		if (setjmp(jb) == 0) {
101			if (db_trace_thread(thr, 1) != 0)
102				db_printf("***\n");
103		}
104		kdb_jmpbuf(prev_jb);
105		thr = kdb_thr_next(thr);
106	}
107}
108
109/*
110 * Lookup a thread based on a db expression address.  We assume that the
111 * address was parsed in hexadecimal.  We reparse the address in decimal
112 * first and try to treat it as a thread ID to find an associated thread.
113 * If that fails and check_pid is true, we treat the decimal value as a
114 * PID.  If that matches a process, we return the first thread in that
115 * process.  Otherwise, we treat the addr as a pointer to a thread.
116 */
117struct thread *
118db_lookup_thread(db_expr_t addr, boolean_t check_pid)
119{
120	struct thread *td;
121	db_expr_t decaddr;
122	struct proc *p;
123
124	/*
125	 * If the parsed address was not a valid decimal expression,
126	 * assume it is a thread pointer.
127	 */
128	decaddr = db_hex2dec(addr);
129	if (decaddr == -1)
130		return ((struct thread *)addr);
131
132	td = kdb_thr_lookup(decaddr);
133	if (td != NULL)
134		return (td);
135	if (check_pid) {
136		FOREACH_PROC_IN_SYSTEM(p) {
137			if (p->p_pid == decaddr)
138				return (FIRST_THREAD_IN_PROC(p));
139		}
140		LIST_FOREACH(p, &zombproc, p_list) {
141			if (p->p_pid == decaddr)
142				return (FIRST_THREAD_IN_PROC(p));
143		}
144	}
145	return ((struct thread *)addr);
146}
147
148/*
149 * Lookup a process based on a db expression address.  We assume that the
150 * address was parsed in hexadecimal.  We reparse the address in decimal
151 * first and try to treat it as a PID to find an associated process.
152 * If that fails we treat the addr as a pointer to a process.
153 */
154struct proc *
155db_lookup_proc(db_expr_t addr)
156{
157	db_expr_t decaddr;
158	struct proc *p;
159
160	decaddr = db_hex2dec(addr);
161	if (decaddr != -1) {
162		FOREACH_PROC_IN_SYSTEM(p) {
163			if (p->p_pid == decaddr)
164				return (p);
165		}
166		LIST_FOREACH(p, &zombproc, p_list) {
167			if (p->p_pid == decaddr)
168				return (p);
169		}
170	}
171	return ((struct proc *)addr);
172}
173