kthr.c revision 222813 
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 AUTHORS ``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 AUTHORS 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: head/gnu/usr.bin/gdb/kgdb/kthr.c 222813 2011-06-07 08:46:13Z attilio $");
29
30#include <sys/param.h>
31#include <sys/cpuset.h>
32#include <sys/proc.h>
33#include <sys/types.h>
34#include <sys/signal.h>
35#include <err.h>
36#include <inttypes.h>
37#include <kvm.h>
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41#include <unistd.h>
42
43#include <defs.h>
44#include <frame-unwind.h>
45
46#include "kgdb.h"
47#include <machine/pcb.h>
48
49static CORE_ADDR dumppcb;
50static int dumptid;
51
52static CORE_ADDR stoppcbs;
53static cpuset_t stopped_cpus;
54
55static struct kthr *first;
56struct kthr *curkthr;
57
58CORE_ADDR
59kgdb_lookup(const char *sym)
60{
61	CORE_ADDR addr;
62	char *name;
63
64	asprintf(&name, "&%s", sym);
65	addr = kgdb_parse(name);
66	free(name);
67	return (addr);
68}
69
70struct kthr *
71kgdb_thr_first(void)
72{
73	return (first);
74}
75
76struct kthr *
77kgdb_thr_init(void)
78{
79	struct proc p;
80	struct thread td;
81	long cpusetsize;
82	struct kthr *kt;
83	CORE_ADDR addr;
84	uintptr_t paddr;
85
86	while (first != NULL) {
87		kt = first;
88		first = kt->next;
89		free(kt);
90	}
91
92	addr = kgdb_lookup("allproc");
93	if (addr == 0)
94		return (NULL);
95	kvm_read(kvm, addr, &paddr, sizeof(paddr));
96
97	dumppcb = kgdb_lookup("dumppcb");
98	if (dumppcb == 0)
99		return (NULL);
100
101	addr = kgdb_lookup("dumptid");
102	if (addr != 0)
103		kvm_read(kvm, addr, &dumptid, sizeof(dumptid));
104	else
105		dumptid = -1;
106
107	addr = kgdb_lookup("stopped_cpus");
108	CPU_ZERO(&stopped_cpus);
109	cpusetsize = sysconf(_SC_CPUSET_SIZE);
110	if (cpusetsize != -1 && (u_long)cpusetsize <= sizeof(cpuset_t) &&
111	    addr != 0)
112		kvm_read(kvm, addr, &stopped_cpus, cpusetsize);
113
114	stoppcbs = kgdb_lookup("stoppcbs");
115
116	while (paddr != 0) {
117		if (kvm_read(kvm, paddr, &p, sizeof(p)) != sizeof(p)) {
118			warnx("kvm_read: %s", kvm_geterr(kvm));
119			break;
120		}
121		addr = (uintptr_t)TAILQ_FIRST(&p.p_threads);
122		while (addr != 0) {
123			if (kvm_read(kvm, addr, &td, sizeof(td)) !=
124			    sizeof(td)) {
125				warnx("kvm_read: %s", kvm_geterr(kvm));
126				break;
127			}
128			kt = malloc(sizeof(*kt));
129			kt->next = first;
130			kt->kaddr = addr;
131			if (td.td_tid == dumptid)
132				kt->pcb = dumppcb;
133			else if (td.td_state == TDS_RUNNING && stoppcbs != 0 &&
134			    CPU_ISSET(td.td_oncpu, &stopped_cpus))
135				kt->pcb = (uintptr_t) stoppcbs + sizeof(struct pcb) * td.td_oncpu;
136			else
137				kt->pcb = (uintptr_t)td.td_pcb;
138			kt->kstack = td.td_kstack;
139			kt->tid = td.td_tid;
140			kt->pid = p.p_pid;
141			kt->paddr = paddr;
142			kt->cpu = td.td_oncpu;
143			first = kt;
144			addr = (uintptr_t)TAILQ_NEXT(&td, td_plist);
145		}
146		paddr = (uintptr_t)LIST_NEXT(&p, p_list);
147	}
148	curkthr = kgdb_thr_lookup_tid(dumptid);
149	if (curkthr == NULL)
150		curkthr = first;
151	return (first);
152}
153
154struct kthr *
155kgdb_thr_lookup_tid(int tid)
156{
157	struct kthr *kt;
158
159	kt = first;
160	while (kt != NULL && kt->tid != tid)
161		kt = kt->next;
162	return (kt);
163}
164
165struct kthr *
166kgdb_thr_lookup_taddr(uintptr_t taddr)
167{
168	struct kthr *kt;
169
170	kt = first;
171	while (kt != NULL && kt->kaddr != taddr)
172		kt = kt->next;
173	return (kt);
174}
175
176struct kthr *
177kgdb_thr_lookup_pid(int pid)
178{
179	struct kthr *kt;
180
181	kt = first;
182	while (kt != NULL && kt->pid != pid)
183		kt = kt->next;
184	return (kt);
185}
186
187struct kthr *
188kgdb_thr_lookup_paddr(uintptr_t paddr)
189{
190	struct kthr *kt;
191
192	kt = first;
193	while (kt != NULL && kt->paddr != paddr)
194		kt = kt->next;
195	return (kt);
196}
197
198struct kthr *
199kgdb_thr_next(struct kthr *kt)
200{
201	return (kt->next);
202}
203
204struct kthr *
205kgdb_thr_select(struct kthr *kt)
206{
207	struct kthr *pcur;
208
209	pcur = curkthr;
210	curkthr = kt;
211	return (pcur);
212}
213
214char *
215kgdb_thr_extra_thread_info(int tid)
216{
217	char comm[MAXCOMLEN + 1];
218	char td_name[MAXCOMLEN + 1];
219	struct kthr *kt;
220	struct proc *p;
221	struct thread *t;
222	static char buf[64];
223
224	kt = kgdb_thr_lookup_tid(tid);
225	if (kt == NULL)
226		return (NULL);
227	snprintf(buf, sizeof(buf), "PID=%d", kt->pid);
228	p = (struct proc *)kt->paddr;
229	if (kvm_read(kvm, (uintptr_t)&p->p_comm[0], &comm, sizeof(comm)) !=
230	    sizeof(comm))
231		return (buf);
232	strlcat(buf, ": ", sizeof(buf));
233	strlcat(buf, comm, sizeof(buf));
234	t = (struct thread *)kt->kaddr;
235	if (kvm_read(kvm, (uintptr_t)&t->td_name[0], &td_name,
236	    sizeof(td_name)) == sizeof(td_name) &&
237	    strcmp(comm, td_name) != 0) {
238		strlcat(buf, "/", sizeof(buf));
239		strlcat(buf, td_name, sizeof(buf));
240	}
241	return (buf);
242}
243