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db_xxx.c revision 1.74 
      1 /*	$NetBSD: db_xxx.c,v 1.74 2020/03/10 15:58:37 christos 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 1.74 2020/03/10 15:58:37 christos 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
     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
    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
    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
    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
    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
    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
    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
    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
    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
    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
    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