kthr.c revision 132624 
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 132624 2004-07-25 05:29:15Z 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 "kgdb.h"
41
42static uintptr_t dumppcb;
43static int dumptid;
44
45static struct kthr *first;
46struct kthr *curkthr;
47
48static uintptr_t
49lookup(const char *sym)
50{
51	struct nlist nl[2];
52
53	nl[0].n_name = (char *)(uintptr_t)sym;
54	nl[1].n_name = NULL;
55	if (kvm_nlist(kvm, nl) != 0) {
56		warnx("kvm_nlist(%s): %s", sym, kvm_geterr(kvm));
57		return (0);
58	}
59	return (nl[0].n_value);
60}
61
62struct kthr *
63kgdb_thr_first(void)
64{
65	return (first);
66}
67
68struct kthr *
69kgdb_thr_init(void)
70{
71	struct proc p;
72	struct thread td;
73	struct kthr *kt;
74	uintptr_t addr, paddr;
75
76	addr = lookup("_allproc");
77	if (addr == 0)
78		return (NULL);
79	kvm_read(kvm, addr, &paddr, sizeof(paddr));
80
81	dumppcb = lookup("_dumppcb");
82	if (dumppcb == 0)
83		return (NULL);
84
85	addr = lookup("_dumptid");
86	if (addr != 0)
87		kvm_read(kvm, addr, &dumptid, sizeof(dumptid));
88	else
89		dumptid = -1;
90
91	while (paddr != 0) {
92		if (kvm_read(kvm, paddr, &p, sizeof(p)) != sizeof(p))
93			warnx("kvm_read: %s", kvm_geterr(kvm));
94		addr = (uintptr_t)TAILQ_FIRST(&p.p_threads);
95		while (addr != 0) {
96			if (kvm_read(kvm, addr, &td, sizeof(td)) != sizeof(td))
97				warnx("kvm_read: %s", kvm_geterr(kvm));
98			kt = malloc(sizeof(*kt));
99			kt->next = first;
100			kt->kaddr = addr;
101			kt->pcb = (td.td_tid == dumptid) ? dumppcb :
102			    (uintptr_t)td.td_pcb;
103			kt->kstack = td.td_kstack;
104			kt->tid = td.td_tid;
105			first = kt;
106			addr = (uintptr_t)TAILQ_NEXT(&td, td_plist);
107		}
108		paddr = (uintptr_t)LIST_NEXT(&p, p_list);
109	}
110	curkthr = kgdb_thr_lookup(dumptid);
111	if (curkthr == NULL)
112		curkthr = first;
113	return (first);
114}
115
116struct kthr *
117kgdb_thr_lookup(int tid)
118{
119	struct kthr *kt;
120
121	kt = first;
122	while (kt != NULL && kt->tid != tid)
123		kt = kt->next;
124	return (kt);
125}
126
127struct kthr *
128kgdb_thr_next(struct kthr *kt)
129{
130	return (kt->next);
131}
132
133struct kthr *
134kgdb_thr_select(struct kthr *kt)
135{
136	struct kthr *pcur;
137
138	pcur = curkthr;
139	curkthr = kt;
140	return (pcur);
141}
142