kthr.c revision 225017 
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 225017 2011-08-19 21:28:40Z jhb $");
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
76static void
77kgdb_thr_add_procs(uintptr_t paddr)
78{
79	struct proc p;
80	struct thread td;
81	struct kthr *kt;
82	CORE_ADDR addr;
83
84	while (paddr != 0) {
85		if (kvm_read(kvm, paddr, &p, sizeof(p)) != sizeof(p)) {
86			warnx("kvm_read: %s", kvm_geterr(kvm));
87			break;
88		}
89		addr = (uintptr_t)TAILQ_FIRST(&p.p_threads);
90		while (addr != 0) {
91			if (kvm_read(kvm, addr, &td, sizeof(td)) !=
92			    sizeof(td)) {
93				warnx("kvm_read: %s", kvm_geterr(kvm));
94				break;
95			}
96			kt = malloc(sizeof(*kt));
97			kt->next = first;
98			kt->kaddr = addr;
99			if (td.td_tid == dumptid)
100				kt->pcb = dumppcb;
101			else if (td.td_state == TDS_RUNNING && stoppcbs != 0 &&
102			    CPU_ISSET(td.td_oncpu, &stopped_cpus))
103				kt->pcb = (uintptr_t)stoppcbs +
104				    sizeof(struct pcb) * td.td_oncpu;
105			else
106				kt->pcb = (uintptr_t)td.td_pcb;
107			kt->kstack = td.td_kstack;
108			kt->tid = td.td_tid;
109			kt->pid = p.p_pid;
110			kt->paddr = paddr;
111			kt->cpu = td.td_oncpu;
112			first = kt;
113			addr = (uintptr_t)TAILQ_NEXT(&td, td_plist);
114		}
115		paddr = (uintptr_t)LIST_NEXT(&p, p_list);
116	}
117}
118
119struct kthr *
120kgdb_thr_init(void)
121{
122	long cpusetsize;
123	struct kthr *kt;
124	CORE_ADDR addr;
125	uintptr_t paddr;
126
127	while (first != NULL) {
128		kt = first;
129		first = kt->next;
130		free(kt);
131	}
132
133	addr = kgdb_lookup("allproc");
134	if (addr == 0)
135		return (NULL);
136	kvm_read(kvm, addr, &paddr, sizeof(paddr));
137
138	dumppcb = kgdb_lookup("dumppcb");
139	if (dumppcb == 0)
140		return (NULL);
141
142	addr = kgdb_lookup("dumptid");
143	if (addr != 0)
144		kvm_read(kvm, addr, &dumptid, sizeof(dumptid));
145	else
146		dumptid = -1;
147
148	addr = kgdb_lookup("stopped_cpus");
149	CPU_ZERO(&stopped_cpus);
150	cpusetsize = sysconf(_SC_CPUSET_SIZE);
151	if (cpusetsize != -1 && (u_long)cpusetsize <= sizeof(cpuset_t) &&
152	    addr != 0)
153		kvm_read(kvm, addr, &stopped_cpus, cpusetsize);
154
155	stoppcbs = kgdb_lookup("stoppcbs");
156
157	kgdb_thr_add_procs(paddr);
158	addr = kgdb_lookup("zombproc");
159	if (addr != 0) {
160		kvm_read(kvm, addr, &paddr, sizeof(paddr));
161		kgdb_thr_add_procs(paddr);
162	}
163	curkthr = kgdb_thr_lookup_tid(dumptid);
164	if (curkthr == NULL)
165		curkthr = first;
166	return (first);
167}
168
169struct kthr *
170kgdb_thr_lookup_tid(int tid)
171{
172	struct kthr *kt;
173
174	kt = first;
175	while (kt != NULL && kt->tid != tid)
176		kt = kt->next;
177	return (kt);
178}
179
180struct kthr *
181kgdb_thr_lookup_taddr(uintptr_t taddr)
182{
183	struct kthr *kt;
184
185	kt = first;
186	while (kt != NULL && kt->kaddr != taddr)
187		kt = kt->next;
188	return (kt);
189}
190
191struct kthr *
192kgdb_thr_lookup_pid(int pid)
193{
194	struct kthr *kt;
195
196	kt = first;
197	while (kt != NULL && kt->pid != pid)
198		kt = kt->next;
199	return (kt);
200}
201
202struct kthr *
203kgdb_thr_lookup_paddr(uintptr_t paddr)
204{
205	struct kthr *kt;
206
207	kt = first;
208	while (kt != NULL && kt->paddr != paddr)
209		kt = kt->next;
210	return (kt);
211}
212
213struct kthr *
214kgdb_thr_next(struct kthr *kt)
215{
216	return (kt->next);
217}
218
219struct kthr *
220kgdb_thr_select(struct kthr *kt)
221{
222	struct kthr *pcur;
223
224	pcur = curkthr;
225	curkthr = kt;
226	return (pcur);
227}
228
229char *
230kgdb_thr_extra_thread_info(int tid)
231{
232	char comm[MAXCOMLEN + 1];
233	char td_name[MAXCOMLEN + 1];
234	struct kthr *kt;
235	struct proc *p;
236	struct thread *t;
237	static char buf[64];
238
239	kt = kgdb_thr_lookup_tid(tid);
240	if (kt == NULL)
241		return (NULL);
242	snprintf(buf, sizeof(buf), "PID=%d", kt->pid);
243	p = (struct proc *)kt->paddr;
244	if (kvm_read(kvm, (uintptr_t)&p->p_comm[0], &comm, sizeof(comm)) !=
245	    sizeof(comm))
246		return (buf);
247	strlcat(buf, ": ", sizeof(buf));
248	strlcat(buf, comm, sizeof(buf));
249	t = (struct thread *)kt->kaddr;
250	if (kvm_read(kvm, (uintptr_t)&t->td_name[0], &td_name,
251	    sizeof(td_name)) == sizeof(td_name) &&
252	    strcmp(comm, td_name) != 0) {
253		strlcat(buf, "/", sizeof(buf));
254		strlcat(buf, td_name, sizeof(buf));
255	}
256	return (buf);
257}
258