db_thread.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2004 Marcel Moolenaar
    5  * 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  *
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/12.0/sys/ddb/db_thread.c 326267 2017-11-27 15:14:46Z pfg $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/kdb.h>
   35 #include <sys/proc.h>
   36 
   37 #include <machine/pcb.h>
   38 
   39 #include <ddb/ddb.h>
   40 #include <ddb/db_command.h>
   41 #include <ddb/db_sym.h>
   42 
   43 void
   44 db_print_thread(void)
   45 {
   46         pid_t pid;
   47 
   48         pid = -1;
   49         if (kdb_thread->td_proc != NULL)
   50                 pid = kdb_thread->td_proc->p_pid;
   51         db_printf("[ thread pid %d tid %ld ]\n", pid, (long)kdb_thread->td_tid);
   52 }
   53 
   54 void
   55 db_set_thread(db_expr_t tid, bool hastid, db_expr_t cnt, char *mod)
   56 {
   57         struct thread *thr;
   58         db_expr_t radix;
   59         int err;
   60 
   61         /*
   62          * We parse our own arguments. We don't like the default radix.
   63          */
   64         radix = db_radix;
   65         db_radix = 10;
   66         hastid = db_expression(&tid);
   67         db_radix = radix;
   68         db_skip_to_eol();
   69 
   70         if (hastid) {
   71                 thr = kdb_thr_lookup(tid);
   72                 if (thr != NULL) {
   73                         err = kdb_thr_select(thr);
   74                         if (err != 0) {
   75                                 db_printf("unable to switch to thread %ld\n",
   76                                     (long)thr->td_tid);
   77                                 return;
   78                         }
   79                         db_dot = PC_REGS();
   80                 } else {
   81                         db_printf("%d: invalid thread\n", (int)tid);
   82                         return;
   83                 }
   84         }
   85 
   86         db_print_thread();
   87         db_print_loc_and_inst(PC_REGS());
   88 }
   89 
   90 void
   91 db_show_threads(db_expr_t addr, bool hasaddr, db_expr_t cnt, char *mod)
   92 {
   93         jmp_buf jb;
   94         void *prev_jb;
   95         struct thread *thr;
   96 
   97         thr = kdb_thr_first();
   98         while (!db_pager_quit && thr != NULL) {
   99                 db_printf("  %6ld (%p) (stack %p)  ", (long)thr->td_tid, thr,
  100                     (void *)thr->td_kstack);
  101                 prev_jb = kdb_jmpbuf(jb);
  102                 if (setjmp(jb) == 0) {
  103                         if (db_trace_thread(thr, 1) != 0)
  104                                 db_printf("***\n");
  105                 }
  106                 kdb_jmpbuf(prev_jb);
  107                 thr = kdb_thr_next(thr);
  108         }
  109 }
  110 
  111 /*
  112  * Lookup a thread based on a db expression address.  We assume that the
  113  * address was parsed in hexadecimal.  We reparse the address in decimal
  114  * first and try to treat it as a thread ID to find an associated thread.
  115  * If that fails and check_pid is true, we treat the decimal value as a
  116  * PID.  If that matches a process, we return the first thread in that
  117  * process.  Otherwise, we treat the addr as a pointer to a thread.
  118  */
  119 struct thread *
  120 db_lookup_thread(db_expr_t addr, bool check_pid)
  121 {
  122         struct thread *td;
  123         db_expr_t decaddr;
  124         struct proc *p;
  125 
  126         /*
  127          * If the parsed address was not a valid decimal expression,
  128          * assume it is a thread pointer.
  129          */
  130         decaddr = db_hex2dec(addr);
  131         if (decaddr == -1)
  132                 return ((struct thread *)addr);
  133 
  134         td = kdb_thr_lookup(decaddr);
  135         if (td != NULL)
  136                 return (td);
  137         if (check_pid) {
  138                 FOREACH_PROC_IN_SYSTEM(p) {
  139                         if (p->p_pid == decaddr)
  140                                 return (FIRST_THREAD_IN_PROC(p));
  141                 }
  142                 LIST_FOREACH(p, &zombproc, p_list) {
  143                         if (p->p_pid == decaddr)
  144                                 return (FIRST_THREAD_IN_PROC(p));
  145                 }
  146         }
  147         return ((struct thread *)addr);
  148 }
  149 
  150 /*
  151  * Lookup a process based on a db expression address.  We assume that the
  152  * address was parsed in hexadecimal.  We reparse the address in decimal
  153  * first and try to treat it as a PID to find an associated process.
  154  * If that fails we treat the addr as a pointer to a process.
  155  */
  156 struct proc *
  157 db_lookup_proc(db_expr_t addr)
  158 {
  159         db_expr_t decaddr;
  160         struct proc *p;
  161 
  162         decaddr = db_hex2dec(addr);
  163         if (decaddr != -1) {
  164                 FOREACH_PROC_IN_SYSTEM(p) {
  165                         if (p->p_pid == decaddr)
  166                                 return (p);
  167                 }
  168                 LIST_FOREACH(p, &zombproc, p_list) {
  169                         if (p->p_pid == decaddr)
  170                                 return (p);
  171                 }
  172         }
  173         return ((struct proc *)addr);
  174 }

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FreeBSD/Linux Kernel Cross Reference sys/ddb/db_thread.c

FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_thread.c