kthr.c revision 175452 
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 175452 2008-01-18 18:57:27Z emaste $");
29
30#include <sys/param.h>
31#include <sys/proc.h>
32#include <sys/types.h>
33#include <sys/signal.h>
34#include <err.h>
35#include <inttypes.h>
36#include <kvm.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40
41#include <defs.h>
42#include <frame-unwind.h>
43
44#include "kgdb.h"
45#include <machine/pcb.h>
46
47static uintptr_t dumppcb;
48static int dumptid;
49
50static uintptr_t stoppcbs;
51static __cpumask_t stopped_cpus;
52
53static struct kthr *first;
54struct kthr *curkthr;
55
56uintptr_t
57kgdb_lookup(const char *sym)
58{
59	struct nlist nl[2];
60
61	nl[0].n_name = (char *)(uintptr_t)sym;
62	nl[1].n_name = NULL;
63	if (kvm_nlist(kvm, nl) != 0) {
64		warnx("kvm_nlist(%s): %s", sym, kvm_geterr(kvm));
65		return (0);
66	}
67	return (nl[0].n_value);
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	struct kthr *kt;
82	uintptr_t addr, paddr;
83
84	addr = kgdb_lookup("_allproc");
85	if (addr == 0)
86		return (NULL);
87	kvm_read(kvm, addr, &paddr, sizeof(paddr));
88
89	dumppcb = kgdb_lookup("_dumppcb");
90	if (dumppcb == 0)
91		return (NULL);
92
93	addr = kgdb_lookup("_dumptid");
94	if (addr != 0)
95		kvm_read(kvm, addr, &dumptid, sizeof(dumptid));
96	else
97		dumptid = -1;
98
99	addr =  kgdb_lookup("_stopped_cpus");
100	if (addr != 0)
101		kvm_read(kvm, addr, &stopped_cpus, sizeof(stopped_cpus));
102	else
103		stopped_cpus = 0;
104
105	stoppcbs = kgdb_lookup("_stoppcbs");
106
107	while (paddr != 0) {
108		if (kvm_read(kvm, paddr, &p, sizeof(p)) != sizeof(p)) {
109			warnx("kvm_read: %s", kvm_geterr(kvm));
110			break;
111		}
112		addr = (uintptr_t)TAILQ_FIRST(&p.p_threads);
113		while (addr != 0) {
114			if (kvm_read(kvm, addr, &td, sizeof(td)) !=
115			    sizeof(td)) {
116				warnx("kvm_read: %s", kvm_geterr(kvm));
117				break;
118			}
119			kt = malloc(sizeof(*kt));
120			kt->next = first;
121			kt->kaddr = addr;
122			if (td.td_tid == dumptid)
123				kt->pcb = dumppcb;
124			else if (td.td_state == TDS_RUNNING && ((1 << td.td_oncpu) & stopped_cpus)
125				&& stoppcbs != 0)
126				kt->pcb = (uintptr_t) stoppcbs + sizeof(struct pcb) * td.td_oncpu;
127			else
128				kt->pcb = (uintptr_t)td.td_pcb;
129			kt->kstack = td.td_kstack;
130			kt->tid = td.td_tid;
131			kt->pid = p.p_pid;
132			kt->paddr = paddr;
133			kt->cpu = td.td_oncpu;
134			first = kt;
135			addr = (uintptr_t)TAILQ_NEXT(&td, td_plist);
136		}
137		paddr = (uintptr_t)LIST_NEXT(&p, p_list);
138	}
139	curkthr = kgdb_thr_lookup_tid(dumptid);
140	if (curkthr == NULL)
141		curkthr = first;
142	return (first);
143}
144
145struct kthr *
146kgdb_thr_lookup_tid(int tid)
147{
148	struct kthr *kt;
149
150	kt = first;
151	while (kt != NULL && kt->tid != tid)
152		kt = kt->next;
153	return (kt);
154}
155
156struct kthr *
157kgdb_thr_lookup_taddr(uintptr_t taddr)
158{
159	struct kthr *kt;
160
161	kt = first;
162	while (kt != NULL && kt->kaddr != taddr)
163		kt = kt->next;
164	return (kt);
165}
166
167struct kthr *
168kgdb_thr_lookup_pid(int pid)
169{
170	struct kthr *kt;
171
172	kt = first;
173	while (kt != NULL && kt->pid != pid)
174		kt = kt->next;
175	return (kt);
176}
177
178struct kthr *
179kgdb_thr_lookup_paddr(uintptr_t paddr)
180{
181	struct kthr *kt;
182
183	kt = first;
184	while (kt != NULL && kt->paddr != paddr)
185		kt = kt->next;
186	return (kt);
187}
188
189struct kthr *
190kgdb_thr_next(struct kthr *kt)
191{
192	return (kt->next);
193}
194
195struct kthr *
196kgdb_thr_select(struct kthr *kt)
197{
198	struct kthr *pcur;
199
200	pcur = curkthr;
201	curkthr = kt;
202	return (pcur);
203}
204
205char *
206kgdb_thr_extra_thread_info(int tid)
207{
208	char comm[MAXCOMLEN + 1];
209	char td_name[MAXCOMLEN + 1];
210	struct kthr *kt;
211	struct proc *p;
212	struct thread *t;
213	static char info[MAXCOMLEN + 1 + MAXCOMLEN + 1];
214
215	kt = kgdb_thr_lookup_tid(tid);
216	if (kt == NULL)
217		return (NULL);
218	p = (struct proc *)kt->paddr;
219	t = (struct thread *)kt->kaddr;
220	if (kvm_read(kvm, (uintptr_t)&p->p_comm[0], &comm, sizeof(comm)) !=
221	    sizeof(comm))
222		return (NULL);
223	if (kvm_read(kvm, (uintptr_t)&t->td_name[0], &td_name,
224	    sizeof(td_name)) == sizeof(td_name) &&
225	    strcmp(comm, td_name) != 0)
226		snprintf(info, sizeof(info), "%s/%s", comm, td_name);
227	else
228		strlcpy(info, comm, sizeof(info));
229	return (info);
230}
231