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

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    1 /*-
    2  * Copyright (c) 2004 Marcel Moolenaar
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  *
    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.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/8.2/sys/ddb/db_thread.c 209692 2010-07-04 12:27:18Z bz $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kdb.h>
   33 #include <sys/proc.h>
   34 
   35 #include <machine/pcb.h>
   36 
   37 #include <ddb/ddb.h>
   38 #include <ddb/db_command.h>
   39 #include <ddb/db_sym.h>
   40 
   41 void
   42 db_print_thread(void)
   43 {
   44         pid_t pid;
   45 
   46         pid = -1;
   47         if (kdb_thread->td_proc != NULL)
   48                 pid = kdb_thread->td_proc->p_pid;
   49         db_printf("[thread pid %d tid %ld ]\n", pid, (long)kdb_thread->td_tid);
   50 }
   51 
   52 void
   53 db_set_thread(db_expr_t tid, boolean_t hastid, db_expr_t cnt, char *mod)
   54 {
   55         struct thread *thr;
   56         db_expr_t radix;
   57         int err;
   58 
   59         /*
   60          * We parse our own arguments. We don't like the default radix.
   61          */
   62         radix = db_radix;
   63         db_radix = 10;
   64         hastid = db_expression(&tid);
   65         db_radix = radix;
   66         db_skip_to_eol();
   67 
   68         if (hastid) {
   69                 thr = kdb_thr_lookup(tid);
   70                 if (thr != NULL) {
   71                         err = kdb_thr_select(thr);
   72                         if (err != 0) {
   73                                 db_printf("unable to switch to thread %ld\n",
   74                                     (long)thr->td_tid);
   75                                 return;
   76                         }
   77                         db_dot = PC_REGS();
   78                 } else {
   79                         db_printf("%d: invalid thread\n", (int)tid);
   80                         return;
   81                 }
   82         }
   83 
   84         db_print_thread();
   85         db_print_loc_and_inst(PC_REGS());
   86 }
   87 
   88 void
   89 db_show_threads(db_expr_t addr, boolean_t hasaddr, db_expr_t cnt, char *mod)
   90 {
   91         jmp_buf jb;
   92         void *prev_jb;
   93         struct thread *thr;
   94 
   95         thr = kdb_thr_first();
   96         while (!db_pager_quit && thr != NULL) {
   97                 db_printf("  %6ld (%p)  ", (long)thr->td_tid, thr);
   98                 prev_jb = kdb_jmpbuf(jb);
   99                 if (setjmp(jb) == 0) {
  100                         if (db_trace_thread(thr, 1) != 0)
  101                                 db_printf("***\n");
  102                 }
  103                 kdb_jmpbuf(prev_jb);
  104                 thr = kdb_thr_next(thr);
  105         }
  106 }
  107 
  108 /*
  109  * Lookup a thread based on a db expression address.  We assume that the
  110  * address was parsed in hexadecimal.  We reparse the address in decimal
  111  * first and try to treat it as a thread ID to find an associated thread.
  112  * If that fails and check_pid is true, we terat the decimal value as a
  113  * PID.  If that matches a process, we return the first thread in that
  114  * process.  Otherwise, we treat the addr as a pointer to a thread.
  115  */
  116 struct thread *
  117 db_lookup_thread(db_expr_t addr, boolean_t check_pid)
  118 {
  119         struct thread *td;
  120         db_expr_t decaddr;
  121         struct proc *p;
  122 
  123         /*
  124          * If the parsed address was not a valid decimal expression,
  125          * assume it is a thread pointer.
  126          */
  127         decaddr = db_hex2dec(addr);
  128         if (decaddr == -1)
  129                 return ((struct thread *)addr);
  130 
  131         td = kdb_thr_lookup(decaddr);
  132         if (td != NULL)
  133                 return (td);
  134         if (check_pid) {
  135                 FOREACH_PROC_IN_SYSTEM(p) {
  136                         if (p->p_pid == decaddr)
  137                                 return (FIRST_THREAD_IN_PROC(p));
  138                 }
  139                 LIST_FOREACH(p, &zombproc, p_list) {
  140                         if (p->p_pid == decaddr)
  141                                 return (FIRST_THREAD_IN_PROC(p));
  142                 }
  143         }
  144         return ((struct thread *)addr);
  145 }
  146 
  147 /*
  148  * Lookup a process based on a db expression address.  We assume that the
  149  * address was parsed in hexadecimal.  We reparse the address in decimal
  150  * first and try to treat it as a PID to find an associated process.
  151  * If that fails we treat the addr as a pointer to a process.
  152  */
  153 struct proc *
  154 db_lookup_proc(db_expr_t addr)
  155 {
  156         db_expr_t decaddr;
  157         struct proc *p;
  158 
  159         decaddr = db_hex2dec(addr);
  160         if (decaddr != -1) {
  161                 FOREACH_PROC_IN_SYSTEM(p) {
  162                         if (p->p_pid == decaddr)
  163                                 return (p);
  164                 }
  165                 LIST_FOREACH(p, &zombproc, p_list) {
  166                         if (p->p_pid == decaddr)
  167                                 return (p);
  168                 }
  169         }
  170         return ((struct proc *)addr);
  171 }

Cache object: 292867a4ffd9932d8cf47dcfbdd0ef87


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