The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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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/10.1/sys/ddb/db_thread.c 228568 2011-12-16 11:42:50Z kib $");
   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) (stack %p)  ", (long)thr->td_tid, thr,
   98                     (void *)thr->td_kstack);
   99                 prev_jb = kdb_jmpbuf(jb);
  100                 if (setjmp(jb) == 0) {
  101                         if (db_trace_thread(thr, 1) != 0)
  102                                 db_printf("***\n");
  103                 }
  104                 kdb_jmpbuf(prev_jb);
  105                 thr = kdb_thr_next(thr);
  106         }
  107 }
  108 
  109 /*
  110  * Lookup a thread based on a db expression address.  We assume that the
  111  * address was parsed in hexadecimal.  We reparse the address in decimal
  112  * first and try to treat it as a thread ID to find an associated thread.
  113  * If that fails and check_pid is true, we treat the decimal value as a
  114  * PID.  If that matches a process, we return the first thread in that
  115  * process.  Otherwise, we treat the addr as a pointer to a thread.
  116  */
  117 struct thread *
  118 db_lookup_thread(db_expr_t addr, boolean_t check_pid)
  119 {
  120         struct thread *td;
  121         db_expr_t decaddr;
  122         struct proc *p;
  123 
  124         /*
  125          * If the parsed address was not a valid decimal expression,
  126          * assume it is a thread pointer.
  127          */
  128         decaddr = db_hex2dec(addr);
  129         if (decaddr == -1)
  130                 return ((struct thread *)addr);
  131 
  132         td = kdb_thr_lookup(decaddr);
  133         if (td != NULL)
  134                 return (td);
  135         if (check_pid) {
  136                 FOREACH_PROC_IN_SYSTEM(p) {
  137                         if (p->p_pid == decaddr)
  138                                 return (FIRST_THREAD_IN_PROC(p));
  139                 }
  140                 LIST_FOREACH(p, &zombproc, p_list) {
  141                         if (p->p_pid == decaddr)
  142                                 return (FIRST_THREAD_IN_PROC(p));
  143                 }
  144         }
  145         return ((struct thread *)addr);
  146 }
  147 
  148 /*
  149  * Lookup a process based on a db expression address.  We assume that the
  150  * address was parsed in hexadecimal.  We reparse the address in decimal
  151  * first and try to treat it as a PID to find an associated process.
  152  * If that fails we treat the addr as a pointer to a process.
  153  */
  154 struct proc *
  155 db_lookup_proc(db_expr_t addr)
  156 {
  157         db_expr_t decaddr;
  158         struct proc *p;
  159 
  160         decaddr = db_hex2dec(addr);
  161         if (decaddr != -1) {
  162                 FOREACH_PROC_IN_SYSTEM(p) {
  163                         if (p->p_pid == decaddr)
  164                                 return (p);
  165                 }
  166                 LIST_FOREACH(p, &zombproc, p_list) {
  167                         if (p->p_pid == decaddr)
  168                                 return (p);
  169                 }
  170         }
  171         return ((struct proc *)addr);
  172 }

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