1 /* $NetBSD: db_xxx.c,v 1.75 2020/05/23 23:42:42 ad 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 1.75 2020/05/23 23:42:42 ad 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
73 #include <ddb/ddb.h>
74 #include <ddb/db_user.h>
75
76 #ifdef KGDB
77 #include <sys/kgdb.h>
78 #endif
79
80 void
db_kill_proc(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)81 db_kill_proc(db_expr_t addr, bool haddr,
82 db_expr_t count, const char *modif)
83 {
84 #ifdef _KERNEL /* XXX CRASH(8) */
85 struct proc *p;
86 ksiginfo_t ksi;
87 db_expr_t pid, sig;
88 int t;
89
90 /* What pid? */
91 if (!db_expression(&pid)) {
92 db_error("pid?\n");
93 /*NOTREACHED*/
94 }
95 /* What sig? */
96 t = db_read_token();
97 if (t == tCOMMA) {
98 if (!db_expression(&sig)) {
99 db_error("sig?\n");
100 /*NOTREACHED*/
101 }
102 } else {
103 db_unread_token(t);
104 sig = 15;
105 }
106 if (db_read_token() != tEOL) {
107 db_error("?\n");
108 /*NOTREACHED*/
109 }
110 /* We might stop when the mutex is held or when not */
111 t = mutex_tryenter(&proc_lock);
112 #ifdef DIAGNOSTIC
113 if (!t) {
114 db_error("could not acquire proc_lock mutex\n");
115 /*NOTREACHED*/
116 }
117 #endif
118 p = proc_find((pid_t)pid);
119 if (p == NULL) {
120 if (t)
121 mutex_exit(&proc_lock);
122 db_error("no such proc\n");
123 /*NOTREACHED*/
124 }
125 KSI_INIT(&ksi);
126 ksi.ksi_signo = sig;
127 ksi.ksi_code = SI_USER;
128 ksi.ksi_pid = 0;
129 ksi.ksi_uid = 0;
130 mutex_enter(p->p_lock);
131 kpsignal2(p, &ksi);
132 mutex_exit(p->p_lock);
133 if (t)
134 mutex_exit(&proc_lock);
135 #else
136 db_kernelonly();
137 #endif
138 }
139
140 #ifdef KGDB
141 void
db_kgdb_cmd(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)142 db_kgdb_cmd(db_expr_t addr, bool haddr,
143 db_expr_t count, const char *modif)
144 {
145 kgdb_active++;
146 kgdb_trap(db_trap_type, DDB_REGS);
147 kgdb_active--;
148 }
149 #endif
150
151 void
db_show_files_cmd(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)152 db_show_files_cmd(db_expr_t addr, bool haddr,
153 db_expr_t count, const char *modif)
154 {
155 #ifdef _KERNEL /* XXX CRASH(8) */
156 struct proc *p;
157 int i;
158 filedesc_t *fdp;
159 fdfile_t *ff;
160 file_t *fp;
161 struct vnode *vp;
162 bool full = false;
163 fdtab_t *dt;
164
165 if (!haddr) {
166 db_printf("usage: show files address\n");
167 db_printf("\taddress == an address of a proc structure\n");
168 return;
169 }
170
171 if (modif[0] == 'f')
172 full = true;
173
174 p = (struct proc *) (uintptr_t) addr;
175
176 fdp = p->p_fd;
177 dt = atomic_load_consume(&fdp->fd_dt);
178 for (i = 0; i < dt->dt_nfiles; i++) {
179 if ((ff = dt->dt_ff[i]) == NULL)
180 continue;
181
182 fp = atomic_load_consume(&ff->ff_file);
183
184 /* Only look at vnodes... */
185 if (fp != NULL && fp->f_type == DTYPE_VNODE
186 && fp->f_vnode != NULL) {
187 vp = fp->f_vnode;
188 vfs_vnode_print(vp, full, db_printf);
189
190 #ifdef LOCKDEBUG
191 db_printf("\nv_uobj.vmobjlock lock details:\n");
192 lockdebug_lock_print(vp->v_uobj.vmobjlock, db_printf);
193 db_printf("\n");
194 #endif
195 }
196 }
197 #endif
198 }
199
200 #ifdef AIO
201 void
db_show_aio_jobs(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)202 db_show_aio_jobs(db_expr_t addr, bool haddr,
203 db_expr_t count, const char *modif)
204 {
205
206 aio_print_jobs(db_printf);
207 }
208 #endif
209
210 #ifdef MQUEUE
211 void
db_show_mqueue_cmd(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)212 db_show_mqueue_cmd(db_expr_t addr, bool haddr,
213 db_expr_t count, const char *modif)
214 {
215
216 #ifdef _KERNEL /* XXX CRASH(8) */
217 mqueue_print_list(db_printf);
218 #endif
219 }
220 #endif
221
222 void
db_show_module_cmd(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)223 db_show_module_cmd(db_expr_t addr, bool haddr,
224 db_expr_t count, const char *modif)
225 {
226
227 #ifdef _KERNEL /* XXX CRASH(8) */
228 module_print_list(db_printf);
229 #endif
230 }
231
232 void
db_show_all_pools(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)233 db_show_all_pools(db_expr_t addr, bool haddr,
234 db_expr_t count, const char *modif)
235 {
236
237 #ifdef _KERNEL /* XXX CRASH(8) */
238 pool_printall(modif, db_printf);
239 #endif
240 }
241
242 void
db_show_all_vmems(db_expr_t addr,bool have_addr,db_expr_t count,const char * modif)243 db_show_all_vmems(db_expr_t addr, bool have_addr,
244 db_expr_t count, const char *modif)
245 {
246
247 #ifdef _KERNEL /* XXX CRASH(8) */
248 vmem_printall(modif, db_printf);
249 #endif
250 }
251
252 void
db_dmesg(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)253 db_dmesg(db_expr_t addr, bool haddr, db_expr_t count, const char *modif)
254 {
255 struct kern_msgbuf mb, *mbp;
256 db_expr_t print;
257 int newl, skip, i;
258 char *p, *bufdata, ch;
259
260 if (!db_read_int("msgbufenabled")) {
261 db_printf("message buffer not available\n");
262 return;
263 }
264 mbp = (struct kern_msgbuf *)db_read_ptr("msgbufp");
265 db_read_bytes((db_addr_t)mbp, sizeof(mb), (char *)&mb);
266 if (mb.msg_magic != MSG_MAGIC) {
267 db_printf("message buffer not available\n");
268 return;
269 }
270
271 bufdata = &mbp->msg_bufc[0];
272
273 if (haddr && addr < mb.msg_bufs)
274 print = addr;
275 else
276 print = mb.msg_bufs;
277
278 for (newl = skip = i = 0, p = bufdata + mb.msg_bufx;
279 i < mb.msg_bufs; i++, p++) {
280 if (p == bufdata + mb.msg_bufs)
281 p = bufdata;
282 if (i < mb.msg_bufs - print) {
283 continue;
284 }
285 db_read_bytes((db_addr_t)p, sizeof(ch), &ch);
286 /* Skip "\n<.*>" syslog sequences. */
287 if (skip) {
288 if (ch == '>')
289 newl = skip = 0;
290 continue;
291 }
292 if (newl && ch == '<') {
293 skip = 1;
294 continue;
295 }
296 if (ch == '\0')
297 continue;
298 newl = ch == '\n';
299 db_printf("%c", ch);
300 }
301 if (!newl)
302 db_printf("\n");
303 }
304
305 void
db_show_sched_qs(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)306 db_show_sched_qs(db_expr_t addr, bool haddr,
307 db_expr_t count, const char *modif)
308 {
309
310 #ifdef _KERNEL /* XXX CRASH(8) */
311 sched_print_runqueue(db_printf);
312 #endif
313 }
314
315 void
db_show_panic(db_expr_t addr,bool haddr,db_expr_t count,const char * modif)316 db_show_panic(db_expr_t addr, bool haddr, db_expr_t count, const char *modif)
317 {
318 #ifdef _KERNEL /* XXX CRASH(8) */
319 int s;
320
321 s = splhigh();
322
323 db_printf("Panic string: %s\n", panicstr);
324
325 (void)splx(s);
326 #endif
327 }
328