kthr.c revision 149954 
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 149954 2005-09-10 18:25:53Z marcel $");
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
40#include <defs.h>
41#include <frame-unwind.h>
42
43#include "kgdb.h"
44
45static uintptr_t dumppcb;
46static int dumptid;
47
48static struct kthr *first;
49struct kthr *curkthr;
50
51static uintptr_t
52lookup(const char *sym)
53{
54	struct nlist nl[2];
55
56	nl[0].n_name = (char *)(uintptr_t)sym;
57	nl[1].n_name = NULL;
58	if (kvm_nlist(kvm, nl) != 0) {
59		warnx("kvm_nlist(%s): %s", sym, kvm_geterr(kvm));
60		return (0);
61	}
62	return (nl[0].n_value);
63}
64
65struct kthr *
66kgdb_thr_first(void)
67{
68	return (first);
69}
70
71struct kthr *
72kgdb_thr_init(void)
73{
74	struct proc p;
75	struct thread td;
76	struct kthr *kt;
77	uintptr_t addr, paddr;
78
79	addr = lookup("_allproc");
80	if (addr == 0)
81		return (NULL);
82	kvm_read(kvm, addr, &paddr, sizeof(paddr));
83
84	dumppcb = lookup("_dumppcb");
85	if (dumppcb == 0)
86		return (NULL);
87
88	addr = lookup("_dumptid");
89	if (addr != 0)
90		kvm_read(kvm, addr, &dumptid, sizeof(dumptid));
91	else
92		dumptid = -1;
93
94	while (paddr != 0) {
95		if (kvm_read(kvm, paddr, &p, sizeof(p)) != sizeof(p))
96			warnx("kvm_read: %s", kvm_geterr(kvm));
97		addr = (uintptr_t)TAILQ_FIRST(&p.p_threads);
98		while (addr != 0) {
99			if (kvm_read(kvm, addr, &td, sizeof(td)) != sizeof(td))
100				warnx("kvm_read: %s", kvm_geterr(kvm));
101			kt = malloc(sizeof(*kt));
102			kt->next = first;
103			kt->kaddr = addr;
104			kt->pcb = (td.td_tid == dumptid) ? dumppcb :
105			    (uintptr_t)td.td_pcb;
106			kt->kstack = td.td_kstack;
107			kt->tid = td.td_tid;
108			kt->pid = p.p_pid;
109			kt->paddr = paddr;
110			first = kt;
111			addr = (uintptr_t)TAILQ_NEXT(&td, td_plist);
112		}
113		paddr = (uintptr_t)LIST_NEXT(&p, p_list);
114	}
115	curkthr = kgdb_thr_lookup_tid(dumptid);
116	if (curkthr == NULL)
117		curkthr = first;
118	return (first);
119}
120
121struct kthr *
122kgdb_thr_lookup_tid(int tid)
123{
124	struct kthr *kt;
125
126	kt = first;
127	while (kt != NULL && kt->tid != tid)
128		kt = kt->next;
129	return (kt);
130}
131
132struct kthr *
133kgdb_thr_lookup_taddr(uintptr_t taddr)
134{
135	struct kthr *kt;
136
137	kt = first;
138	while (kt != NULL && kt->kaddr != taddr)
139		kt = kt->next;
140	return (kt);
141}
142
143struct kthr *
144kgdb_thr_lookup_pid(int pid)
145{
146	struct kthr *kt;
147
148	kt = first;
149	while (kt != NULL && kt->pid != pid)
150		kt = kt->next;
151	return (kt);
152}
153
154struct kthr *
155kgdb_thr_lookup_paddr(uintptr_t paddr)
156{
157	struct kthr *kt;
158
159	kt = first;
160	while (kt != NULL && kt->paddr != paddr)
161		kt = kt->next;
162	return (kt);
163}
164
165struct kthr *
166kgdb_thr_next(struct kthr *kt)
167{
168	return (kt->next);
169}
170
171struct kthr *
172kgdb_thr_select(struct kthr *kt)
173{
174	struct kthr *pcur;
175
176	pcur = curkthr;
177	curkthr = kt;
178	return (pcur);
179}
180
181char *
182kgdb_thr_extra_thread_info(int tid)
183{
184	struct kthr *kt;
185	struct proc *p;
186	static char comm[MAXCOMLEN + 1];
187
188	kt = kgdb_thr_lookup_tid(tid);
189	if (kt == NULL)
190		return (NULL);
191	p = (struct proc *)kt->paddr;
192	if (kvm_read(kvm, (uintptr_t)&p->p_comm[0], &comm, sizeof(comm)) !=
193	    sizeof(comm))
194		return (NULL);
195
196	return (comm);
197}
198