1 /* $NetBSD: db_xxx.c,v 1.80 2023/11/02 10:31:55 martin Exp $ */
2
3 /*
4 * Copyright (c) 1982, 1986, 1989, 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * from: kern_proc.c 8.4 (Berkeley) 1/4/94
32 */
33
34 /*
35 * Miscellaneous DDB functions that are intimate (xxx) with various
36 * data structures and functions used by the kernel (proc, callout).
37 */
38
39 #include <sys/cdefs.h>
40 __KERNEL_RCSID(0, "$NetBSD: db_xxx.c,v 1.80 2023/11/02 10:31:55 martin Exp $");
41
42 #ifdef _KERNEL_OPT
43 #include "opt_kgdb.h"
44 #include "opt_aio.h"
45 #include "opt_mqueue.h"
46 #endif
47
48 #ifndef _KERNEL
49 #include <stdbool.h>
50 #endif
51
52 #include <sys/param.h>
53 #include <sys/atomic.h>
54 #include <sys/systm.h>
55 #include <sys/kernel.h>
56 #include <sys/proc.h>
57 #include <sys/msgbuf.h>
58 #include <sys/callout.h>
59 #include <sys/file.h>
60 #include <sys/filedesc.h>
61 #include <sys/lockdebug.h>
62 #include <sys/signalvar.h>
63 #include <sys/resourcevar.h>
64 #include <sys/pool.h>
65 #include <sys/uio.h>
66 #include <sys/kauth.h>
67 #include <sys/mqueue.h>
68 #include <sys/vnode.h>
69 #include <sys/module.h>
70 #include <sys/cpu.h>
71 #include <sys/vmem.h>
72 #include <sys/condvar.h>
73 #include <sys/sleepq.h>
74 #include <sys/selinfo.h>
75
76 #include <ddb/ddb.h>
77 #include <ddb/db_user.h>
78
79 #ifdef KGDB
80 #include <sys/kgdb.h>
81 #endif
82
83 void
db_kill_proc(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)84 db_kill_proc(db_expr_t addr, bool haddr,
85 db_expr_t count, const char *modif)
86 {
87 #ifdef _KERNEL /* XXX CRASH(8) */
88 struct proc *p;
89 ksiginfo_t ksi;
90 db_expr_t pid, sig;
91 int t;
92
93 /* What pid? */
94 if (!db_expression(&pid)) {
95 db_error("pid?\n");
96 /*NOTREACHED*/
97 }
98 /* What sig? */
99 t = db_read_token();
100 if (t == tCOMMA) {
101 if (!db_expression(&sig)) {
102 db_error("sig?\n");
103 /*NOTREACHED*/
104 }
105 } else {
106 db_unread_token(t);
107 sig = 15;
108 }
109 if (db_read_token() != tEOL) {
110 db_error("?\n");
111 /*NOTREACHED*/
112 }
113 /* We might stop when the mutex is held or when not */
114 t = mutex_tryenter(&proc_lock);
115 #ifdef DIAGNOSTIC
116 if (!t) {
117 db_error("could not acquire proc_lock mutex\n");
118 /*NOTREACHED*/
119 }
120 #endif
121 p = proc_find((pid_t)pid);
122 if (p == NULL) {
123 if (t)
124 mutex_exit(&proc_lock);
125 db_error("no such proc\n");
126 /*NOTREACHED*/
127 }
128 KSI_INIT(&ksi);
129 ksi.ksi_signo = sig;
130 ksi.ksi_code = SI_USER;
131 ksi.ksi_pid = 0;
132 ksi.ksi_uid = 0;
133 mutex_enter(p->p_lock);
134 kpsignal2(p, &ksi);
135 mutex_exit(p->p_lock);
136 if (t)
137 mutex_exit(&proc_lock);
138 #else
139 db_kernelonly();
140 #endif
141 }
142
143 #ifdef KGDB
144 void
db_kgdb_cmd(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)145 db_kgdb_cmd(db_expr_t addr, bool haddr,
146 db_expr_t count, const char *modif)
147 {
148 kgdb_active++;
149 kgdb_trap(db_trap_type, DDB_REGS);
150 kgdb_active--;
151 }
152 #endif
153
154 void
db_show_files_cmd(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)155 db_show_files_cmd(db_expr_t addr, bool haddr,
156 db_expr_t count, const char *modif)
157 {
158 #ifdef _KERNEL /* XXX CRASH(8) */
159 struct proc *p;
160 int i;
161 filedesc_t *fdp;
162 fdfile_t *ff;
163 file_t *fp;
164 struct vnode *vp;
165 bool full = false;
166 fdtab_t *dt;
167
168 if (!haddr) {
169 db_printf("usage: show files address\n");
170 db_printf("\taddress == an address of a proc structure\n");
171 return;
172 }
173
174 if (modif[0] == 'f')
175 full = true;
176
177 p = (struct proc *) (uintptr_t) addr;
178
179 fdp = p->p_fd;
180 dt = atomic_load_consume(&fdp->fd_dt);
181 for (i = 0; i < dt->dt_nfiles; i++) {
182 if ((ff = dt->dt_ff[i]) == NULL)
183 continue;
184
185 fp = atomic_load_consume(&ff->ff_file);
186
187 /* Only look at vnodes... */
188 if (fp != NULL && fp->f_type == DTYPE_VNODE
189 && fp->f_vnode != NULL) {
190 vp = fp->f_vnode;
191 vfs_vnode_print(vp, full, db_printf);
192
193 #ifdef LOCKDEBUG
194 db_printf("\nv_uobj.vmobjlock lock details:\n");
195 lockdebug_lock_print(vp->v_uobj.vmobjlock, db_printf);
196 db_printf("\n");
197 #endif
198 }
199 }
200 #endif
201 }
202
203 #ifdef AIO
204 void
db_show_aio_jobs(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)205 db_show_aio_jobs(db_expr_t addr, bool haddr,
206 db_expr_t count, const char *modif)
207 {
208
209 aio_print_jobs(db_printf);
210 }
211 #endif
212
213 #ifdef MQUEUE
214 void
db_show_mqueue_cmd(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)215 db_show_mqueue_cmd(db_expr_t addr, bool haddr,
216 db_expr_t count, const char *modif)
217 {
218
219 #ifdef _KERNEL /* XXX CRASH(8) */
220 mqueue_print_list(db_printf);
221 #endif
222 }
223 #endif
224
225 void
db_show_module_cmd(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)226 db_show_module_cmd(db_expr_t addr, bool haddr,
227 db_expr_t count, const char *modif)
228 {
229
230 #ifdef _KERNEL /* XXX CRASH(8) */
231 module_print_list(db_printf);
232 #endif
233 }
234
235 void
db_show_all_pools(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)236 db_show_all_pools(db_expr_t addr, bool haddr,
237 db_expr_t count, const char *modif)
238 {
239
240 #ifdef _KERNEL /* XXX CRASH(8) */
241 pool_printall(modif, db_printf);
242 #endif
243 }
244
245 void
db_show_all_vmems(db_expr_t addr,bool have_addr,db_expr_t count,const char * modif)246 db_show_all_vmems(db_expr_t addr, bool have_addr,
247 db_expr_t count, const char *modif)
248 {
249
250 #ifdef _KERNEL /* XXX CRASH(8) */
251 vmem_printall(modif, db_printf);
252 #endif
253 }
254
255 void
db_dmesg(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)256 db_dmesg(db_expr_t addr, bool haddr, db_expr_t count, const char *modif)
257 {
258 struct kern_msgbuf mb, *mbp;
259 db_expr_t print;
260 int newl, skip, i;
261 char *p, *bufdata, ch;
262
263 if (!db_read_int("msgbufenabled")) {
264 db_printf("message buffer not available\n");
265 return;
266 }
267 mbp = (struct kern_msgbuf *)db_read_ptr("msgbufp");
268 db_read_bytes((db_addr_t)mbp, sizeof(mb), (char *)&mb);
269 if (mb.msg_magic != MSG_MAGIC) {
270 db_printf("message buffer not available\n");
271 return;
272 }
273
274 bufdata = &mbp->msg_bufc[0];
275
276 if (haddr && addr < mb.msg_bufs)
277 print = addr;
278 else
279 print = mb.msg_bufs;
280
281 for (newl = skip = i = 0, p = bufdata + mb.msg_bufx;
282 i < mb.msg_bufs; i++, p++) {
283 if (p == bufdata + mb.msg_bufs)
284 p = bufdata;
285 if (i < mb.msg_bufs - print) {
286 continue;
287 }
288 db_read_bytes((db_addr_t)p, sizeof(ch), &ch);
289 /* Skip "\n<.*>" syslog sequences. */
290 if (skip) {
291 if (ch == '>')
292 newl = skip = 0;
293 continue;
294 }
295 if (newl && ch == '<') {
296 skip = 1;
297 continue;
298 }
299 if (ch == '\0')
300 continue;
301 newl = ch == '\n';
302 db_printf("%c", ch);
303 }
304 if (!newl)
305 db_printf("\n");
306 }
307
308 void
db_show_sched_qs(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)309 db_show_sched_qs(db_expr_t addr, bool haddr,
310 db_expr_t count, const char *modif)
311 {
312
313 #ifdef _KERNEL /* XXX CRASH(8) */
314 sched_print_runqueue(db_printf);
315 #endif
316 }
317
318 void
db_show_panic(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)319 db_show_panic(db_expr_t addr, bool haddr, db_expr_t count, const char *modif)
320 {
321 #ifdef _KERNEL /* XXX CRASH(8) */
322 int s;
323
324 s = splhigh();
325
326 db_printf("Panic string: %s\n", panicstr);
327
328 (void)splx(s);
329 #endif
330 }
331
332 void
db_show_condvar(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)333 db_show_condvar(db_expr_t addr, bool haddr, db_expr_t count, const char *modif)
334 {
335 kcondvar_t *cv = (kcondvar_t *)(uintptr_t)addr;
336 char buf[9], *wmesg;
337
338 /* XXX messing with kcondvar_t guts without defs */
339 db_read_bytes((db_addr_t)&cv->cv_opaque[1], sizeof(wmesg),
340 (char *)&wmesg);
341 db_read_bytes((db_addr_t)wmesg, sizeof(buf) - 1, buf);
342 buf[sizeof(buf) - 1] = '\0';
343 db_printf("wmesg=%s ", buf);
344 db_show_sleepq((db_addr_t)&cv->cv_opaque[0], false, 0, modif);
345 }
346
347 void
db_show_sleepq(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)348 db_show_sleepq(db_expr_t addr, bool haddr, db_expr_t count, const char *modif)
349 {
350 sleepq_t sq;
351 lwp_t *lp;
352
353 db_read_bytes(addr, sizeof(lp), (char *)&sq);
354 db_printf("sleepq=");
355 if ((lp = LIST_FIRST(&sq)) == NULL) {
356 db_printf("<empty>");
357 }
358 while (lp != NULL) {
359 db_printf("%p", lp);
360 db_read_bytes((db_addr_t)&lp->l_sleepchain.le_next, sizeof(lp),
361 (char *)&lp);
362 if (lp != NULL)
363 db_printf(",");
364 }
365 db_printf("\n");
366 }
367
368 void
db_show_selinfo(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)369 db_show_selinfo(db_expr_t addr, bool haddr, db_expr_t count, const char *modif)
370 {
371 struct selinfo sel;
372
373 db_read_bytes(addr, sizeof(sel), (char *)&sel);
374
375 db_printf("collision=%llx klist=%p cluster=%p lwp=%p fdinfo=%lx "
376 "sel_chain=%p\n", (long long)sel.sel_collision,
377 SLIST_FIRST(&sel.sel_klist), sel.sel_cluster, sel.sel_lwp,
378 (long)sel.sel_fdinfo, sel.sel_chain.sle_next);
379 }
380