xref: /freebsd/sys/ddb/db_thread.c (revision acd3428b7d3e94cef0e1881c868cb4b131d4ff41)
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 
41 static db_expr_t hex2dec(db_expr_t expr);
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, boolean_t hastid, db_expr_t cnt, char *mod)
56 {
57 	struct thread *thr;
58 	db_expr_t radix;
59 	int err;
60 
61 	/*
62 	 * We parse our own arguments. We don't like the default radix.
63 	 */
64 	radix = db_radix;
65 	db_radix = 10;
66 	hastid = db_expression(&tid);
67 	db_radix = radix;
68 	db_skip_to_eol();
69 
70 	if (hastid) {
71 		thr = kdb_thr_lookup(tid);
72 		if (thr != NULL) {
73 			err = kdb_thr_select(thr);
74 			if (err != 0) {
75 				db_printf("unable to switch to thread %ld\n",
76 				    (long)thr->td_tid);
77 				return;
78 			}
79 			db_dot = PC_REGS();
80 		} else {
81 			db_printf("%d: invalid thread\n", (int)tid);
82 			return;
83 		}
84 	}
85 
86 	db_print_thread();
87 	db_print_loc_and_inst(PC_REGS());
88 }
89 
90 void
91 db_show_threads(db_expr_t addr, boolean_t hasaddr, db_expr_t cnt, char *mod)
92 {
93 	jmp_buf jb;
94 	void *prev_jb;
95 	struct thread *thr;
96 
97 	thr = kdb_thr_first();
98 	while (!db_pager_quit && thr != NULL) {
99 		db_printf("  %6ld (%p)  ", (long)thr->td_tid, thr);
100 		prev_jb = kdb_jmpbuf(jb);
101 		if (setjmp(jb) == 0) {
102 			if (db_trace_thread(thr, 1) != 0)
103 				db_printf("***\n");
104 		}
105 		kdb_jmpbuf(prev_jb);
106 		thr = kdb_thr_next(thr);
107 	}
108 }
109 
110 /*
111  * Take the parsed expression value from the command line that was parsed
112  * as a hexadecimal value and convert it as if the expression was parsed
113  * as a decimal value.  Returns -1 if the expression was not a valid
114  * decimal value.
115  */
116 static db_expr_t
117 hex2dec(db_expr_t expr)
118 {
119 	uintptr_t x, y;
120 	db_expr_t val;
121 
122 	y = 1;
123 	val = 0;
124 	x = expr;
125 	while (x != 0) {
126 		if (x % 16 > 9)
127 			return (-1);
128 		val += (x % 16) * (y);
129 		x >>= 4;
130 		y *= 10;
131 	}
132 	return (val);
133 }
134 
135 /*
136  * Lookup a thread based on a db expression address.  We assume that the
137  * address was parsed in hexadecimal.  We reparse the address in decimal
138  * first and try to treat it as a thread ID to find an associated thread.
139  * If that fails and check_pid is true, we terat the decimal value as a
140  * PID.  If that matches a process, we return the first thread in that
141  * process.  Otherwise, we treat the addr as a pointer to a thread.
142  */
143 struct thread *
144 db_lookup_thread(db_expr_t addr, boolean_t check_pid)
145 {
146 	struct thread *td;
147 	db_expr_t decaddr;
148 	struct proc *p;
149 
150 	/*
151 	 * If the parsed address was not a valid decimal expression,
152 	 * assume it is a thread pointer.
153 	 */
154 	decaddr = hex2dec(addr);
155 	if (decaddr == -1)
156 		return ((struct thread *)addr);
157 
158 	td = kdb_thr_lookup(decaddr);
159 	if (td != NULL)
160 		return (td);
161 	if (check_pid) {
162 		LIST_FOREACH(p, &allproc, p_list) {
163 			if (p->p_pid == decaddr)
164 				return (FIRST_THREAD_IN_PROC(p));
165 		}
166 		LIST_FOREACH(p, &zombproc, p_list) {
167 			if (p->p_pid == decaddr)
168 				return (FIRST_THREAD_IN_PROC(p));
169 		}
170 	}
171 	return ((struct thread *)addr);
172 }
173 
174 /*
175  * Lookup a process based on a db expression address.  We assume that the
176  * address was parsed in hexadecimal.  We reparse the address in decimal
177  * first and try to treat it as a PID to find an associated process.
178  * If that fails we treat the addr as a pointer to a process.
179  */
180 struct proc *
181 db_lookup_proc(db_expr_t addr)
182 {
183 	db_expr_t decaddr;
184 	struct proc *p;
185 
186 	decaddr = hex2dec(addr);
187 	if (decaddr != -1) {
188 		LIST_FOREACH(p, &allproc, p_list) {
189 			if (p->p_pid == decaddr)
190 				return (p);
191 		}
192 		LIST_FOREACH(p, &zombproc, p_list) {
193 			if (p->p_pid == decaddr)
194 				return (p);
195 		}
196 	}
197 	return ((struct proc *)addr);
198 }
199