2 * Copyright (c) 2004 Marcel Moolenaar
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
26 * $FreeBSD: src/gnu/usr.bin/gdb/kgdb/kthr.c,v 1.3 2005/09/10 18:25:53 marcel Exp $
27 * $DragonFly: src/gnu/usr.bin/gdb/kgdb/kthr.c,v 1.5 2008/01/14 21:36:38 corecode Exp $
30 #include <sys/cdefs.h>
32 #include <sys/param.h>
33 #include <machine/globaldata.h>
35 #include <sys/types.h>
36 #include <sys/signal.h>
44 #include <frame-unwind.h>
48 static uintptr_t dumppcb;
51 static struct kthr *first;
66 struct mdglobaldata gd;
68 uintptr_t addr, paddr, prvspace;
71 addr = lookup("_ncpus");
74 kvm_read(kvm, addr, &ncpus, sizeof(ncpus));
76 dumppcb = lookup("_dumppcb");
80 prvspace = lookup("CPU_prvspace");
84 addr = lookup("_dumpthread");
86 kvm_read(kvm, addr, &dumptid, sizeof(dumptid));
89 * XXX Well then. We don't know who dumped us.
90 * We could do some fancy stack matching, but
91 * I doubt this will work. For now just use
94 * Actually we don't even know if we were dumped
95 * or if we are life. Find out by querying "dumping".
99 addr = lookup("_dumping");
100 kvm_read(kvm, addr, &dumping, sizeof(dumping));
102 kvm_read(kvm, prvspace +
103 offsetof(struct privatespace, mdglobaldata),
104 &gd, sizeof(struct mdglobaldata));
105 dumptid = (intptr_t)gd.mi.gd_curthread;
107 /* We must be a live system */
112 for (cpu = 0; cpu < ncpus; cpu++) {
113 kvm_read(kvm, prvspace +
114 cpu * sizeof(struct privatespace) +
115 offsetof(struct privatespace, mdglobaldata),
116 &gd, sizeof(struct mdglobaldata));
118 addr = (uintptr_t)TAILQ_FIRST(&gd.mi.gd_tdallq);
120 if (kvm_read(kvm, addr, &td, sizeof(td)) != sizeof(td)) {
121 warnx("kvm_read: %s, while accessing thread",
125 kt = malloc(sizeof(*kt));
128 kt->tid = addr; /* XXX do we have tids? */
129 kt->pcb = (kt->tid == dumptid) ? dumppcb :
130 (uintptr_t)td.td_pcb;
131 kt->kstack = (uintptr_t)td.td_kstack;
132 if (td.td_proc != NULL) {
133 paddr = (uintptr_t)td.td_proc;
134 if (kvm_read(kvm, paddr, &p, sizeof(p)) != sizeof(p))
135 warnx("kvm_read: %s", kvm_geterr(kvm));
140 * XXX for some stupid reason, gdb uses pid == -1
141 * as a marker for "dead" threads, so we have to
142 * hook all kernel threads on a different pid :/
147 * We are a kernel thread, so our td_pcb is
148 * not used anyways. An exception is the
150 * kt->pcb == 0 is a marker for
151 * "non-dumping kernel thread".
153 if (kt->tid != dumptid)
157 addr = (uintptr_t)TAILQ_NEXT(&td, td_allq);
161 curkthr = kgdb_thr_lookup_tid(dumptid);
168 kgdb_thr_lookup_tid(int tid)
173 while (kt != NULL && kt->tid != tid)
179 kgdb_thr_lookup_taddr(uintptr_t taddr)
184 while (kt != NULL && kt->kaddr != taddr)
190 kgdb_thr_lookup_pid(int pid)
195 while (kt != NULL && kt->pid != pid)
201 kgdb_thr_lookup_paddr(uintptr_t paddr)
206 while (kt != NULL && kt->paddr != paddr)
212 kgdb_thr_next(struct kthr *kt)
218 kgdb_thr_select(struct kthr *kt)
228 kgdb_thr_extra_thread_info(int tid)
231 static char comm[MAXCOMLEN + 1];
233 kt = kgdb_thr_lookup_tid(tid);
236 if (kvm_read(kvm, kt->kaddr + offsetof(struct thread, td_comm), &comm,
237 sizeof(comm)) != sizeof(comm))