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 1.12 2008/05/01 20:36:48 jhb Exp $
29 #include <sys/cdefs.h>
31 #include <sys/param.h>
32 #include <machine/globaldata.h>
34 #include <sys/types.h>
35 #include <sys/signal.h>
44 #include <frame-unwind.h>
49 static CORE_ADDR dumppcb;
50 static CORE_ADDR dumptid;
52 static struct kthr *first;
55 #define LIVESYS_DUMPTID 10
58 kgdb_lookup(const char *sym)
62 nl[0].n_name = (char *)(CORE_ADDR)sym;
64 if (kvm_nlist(kvm, nl) != 0)
66 return (nl[0].n_value);
81 struct mdglobaldata gd;
83 CORE_ADDR addr, paddr, prvspace, gdptr;
86 while (first != NULL) {
92 addr = kgdb_lookup("_ncpus");
95 kvm_read(kvm, addr, &ncpus, sizeof(ncpus));
97 dumppcb = kgdb_lookup("_dumppcb");
101 prvspace = kgdb_lookup("_CPU_prvspace");
105 addr = kgdb_lookup("_dumpthread");
107 kvm_read(kvm, addr, &dumptid, sizeof(dumptid));
110 * XXX Well then. We don't know who dumped us.
111 * We could do some fancy stack matching, but
112 * I doubt this will work. For now just use
115 * Actually we don't even know if we were dumped
116 * or if we are live. Find out by querying "dumping".
120 addr = kgdb_lookup("_dumping");
121 kvm_read(kvm, addr, &dumping, sizeof(dumping));
123 kvm_read(kvm, prvspace + 0, &gdptr, sizeof(gdptr));
124 kvm_read(kvm, gdptr +
125 offsetof(struct privatespace, mdglobaldata),
126 &gd, sizeof(struct mdglobaldata));
127 dumptid = (CORE_ADDR)gd.mi.gd_curthread;
129 /* We must be a live system */
130 dumptid = LIVESYS_DUMPTID;
134 for (cpu = 0; cpu < ncpus; cpu++) {
135 kvm_read(kvm, prvspace + cpu * sizeof(void *),
136 &gdptr, sizeof(gdptr));
137 kvm_read(kvm, gdptr +
138 offsetof(struct privatespace, mdglobaldata),
139 &gd, sizeof(struct mdglobaldata));
141 addr = (uintptr_t)TAILQ_FIRST(&gd.mi.gd_tdallq);
143 if (kvm_read(kvm, addr, &td, sizeof(td)) != sizeof(td)) {
144 warnx("kvm_read: %s, while accessing thread",
148 kt = malloc(sizeof(*kt));
152 kt->pcb = (kt->tid == dumptid) ? dumppcb :
153 (uintptr_t)td.td_pcb;
154 kt->kstack = (uintptr_t)td.td_kstack;
155 if (td.td_proc != NULL) {
156 paddr = (uintptr_t)td.td_proc;
157 if (kvm_read(kvm, paddr, &p, sizeof(p)) != sizeof(p))
158 warnx("kvm_read: %s", kvm_geterr(kvm));
161 addr = (uintptr_t)td.td_lwp;
162 if (kvm_read(kvm, addr, &lwp, sizeof(lwp)) != sizeof(lwp))
163 warnx("kvm_read: %s", kvm_geterr(kvm));
164 kt->lwpid = lwp.lwp_tid;
167 * XXX for some stupid reason, gdb uses pid == -1
168 * as a marker for "dead" threads, so we have to
169 * hook all kernel threads on a different pid :/
174 * We are a kernel thread, so our td_pcb is
175 * not used anyways. An exception is the
177 * kt->pcb == 0 is a marker for
178 * "non-dumping kernel thread".
180 if (kt->tid != dumptid)
184 addr = (uintptr_t)TAILQ_NEXT(&td, td_allq);
188 curkthr = kgdb_thr_lookup_tid(dumptid);
195 kgdb_thr_lookup_tid(CORE_ADDR tid)
200 while (kt != NULL && kt->tid != tid)
206 kgdb_thr_lookup_taddr(uintptr_t taddr)
211 while (kt != NULL && kt->kaddr != taddr)
217 kgdb_thr_lookup_pid(int pid)
222 while (kt != NULL && kt->pid != pid)
228 kgdb_thr_lookup_paddr(uintptr_t paddr)
233 while (kt != NULL && kt->paddr != paddr)
239 kgdb_thr_next(struct kthr *kt)
245 kgdb_thr_select(struct kthr *kt)
255 kgdb_thr_extra_thread_info(CORE_ADDR tid)
257 #if 0 /* Information already provided */
261 char comm[MAXCOMLEN + 1];
263 kt = kgdb_thr_lookup_tid(tid);
267 snprintf(buf, sizeof(buf), "PID=%d", kt->pid);
268 p = (struct proc *)kt->paddr;
269 if (kvm_read(kvm, (uintptr_t)&p->p_comm[0], &comm, sizeof(comm)) ==
271 strlcat(buf, ": ", sizeof(buf));
272 strlcat(buf, comm, sizeof(buf));
280 kgdb_thr_pid_to_str(ptid_t ptid)
282 char comm[MAXCOMLEN + 1];
289 tid = ptid_get_tid(ptid);
291 kt = kgdb_thr_lookup_pid(ptid_get_pid(ptid));
293 kt = kgdb_thr_lookup_tid(tid);
301 snprintf(buf, sizeof(buf), "pid %d", kt->pid);
304 snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
307 p = (struct proc *)kt->paddr;
308 if (kvm_read(kvm, (uintptr_t)&p->p_comm[0], &comm, sizeof(comm)) !=
312 strlcat(buf, ", ", sizeof(buf));
313 strlcat(buf, comm, sizeof(buf));
315 strcpy(buf, "kernel");
318 t = (struct thread *)kt->kaddr;
319 if (kvm_read(kvm, (uintptr_t)&t->td_comm[0], &comm,
320 sizeof(comm)) == sizeof(comm)) {
321 strlcat(buf, " ", sizeof(buf));
322 strlcat(buf, comm, sizeof(buf));