FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_thread.c
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: src/sys/ddb/db_thread.c,v 1.7 2007/01/17 15:05:51 delphij Exp $");
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 FOREACH_PROC_IN_SYSTEM(p) {
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 FOREACH_PROC_IN_SYSTEM(p) {
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
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