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("$FreeBSD$");
   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 static db_expr_t hex2dec(db_expr_t expr);
   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, boolean_t 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, boolean_t 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)  ", (long)thr->td_tid, thr);
  100                 prev_jb = kdb_jmpbuf(jb);
  101                 if (setjmp(jb) == 0) {
  102                         if (db_trace_thread(thr, 1) != 0)
  103                                 db_printf("***\n");
  104                 }
  105                 kdb_jmpbuf(prev_jb);
  106                 thr = kdb_thr_next(thr);
  107         }
  108 }
  109 
  110 /*
  111  * Take the parsed expression value from the command line that was parsed
  112  * as a hexadecimal value and convert it as if the expression was parsed
  113  * as a decimal value.  Returns -1 if the expression was not a valid
  114  * decimal value.
  115  */
  116 static db_expr_t
  117 hex2dec(db_expr_t expr)
  118 {
  119         uintptr_t x, y;
  120         db_expr_t val;
  121 
  122         y = 1;
  123         val = 0;
  124         x = expr;
  125         while (x != 0) {
  126                 if (x % 16 > 9)
  127                         return (-1);
  128                 val += (x % 16) * (y);
  129                 x >>= 4;
  130                 y *= 10;
  131         }
  132         return (val);
  133 }
  134 
  135 /*
  136  * Lookup a thread based on a db expression address.  We assume that the
  137  * address was parsed in hexadecimal.  We reparse the address in decimal
  138  * first and try to treat it as a thread ID to find an associated thread.
  139  * If that fails and check_pid is true, we terat the decimal value as a
  140  * PID.  If that matches a process, we return the first thread in that
  141  * process.  Otherwise, we treat the addr as a pointer to a thread.
  142  */
  143 struct thread *
  144 db_lookup_thread(db_expr_t addr, boolean_t check_pid)
  145 {
  146         struct thread *td;
  147         db_expr_t decaddr;
  148         struct proc *p;
  149 
  150         /*
  151          * If the parsed address was not a valid decimal expression,
  152          * assume it is a thread pointer.
  153          */
  154         decaddr = hex2dec(addr);
  155         if (decaddr == -1)
  156                 return ((struct thread *)addr);
  157 
  158         td = kdb_thr_lookup(decaddr);
  159         if (td != NULL)
  160                 return (td);
  161         if (check_pid) {
  162                 FOREACH_PROC_IN_SYSTEM(p) {
  163                         if (p->p_pid == decaddr)
  164                                 return (FIRST_THREAD_IN_PROC(p));
  165                 }
  166                 LIST_FOREACH(p, &zombproc, p_list) {
  167                         if (p->p_pid == decaddr)
  168                                 return (FIRST_THREAD_IN_PROC(p));
  169                 }
  170         }
  171         return ((struct thread *)addr);
  172 }
  173 
  174 /*
  175  * Lookup a process based on a db expression address.  We assume that the
  176  * address was parsed in hexadecimal.  We reparse the address in decimal
  177  * first and try to treat it as a PID to find an associated process.
  178  * If that fails we treat the addr as a pointer to a process.
  179  */
  180 struct proc *
  181 db_lookup_proc(db_expr_t addr)
  182 {
  183         db_expr_t decaddr;
  184         struct proc *p;
  185 
  186         decaddr = hex2dec(addr);
  187         if (decaddr != -1) {
  188                 FOREACH_PROC_IN_SYSTEM(p) {
  189                         if (p->p_pid == decaddr)
  190                                 return (p);
  191                 }
  192                 LIST_FOREACH(p, &zombproc, p_list) {
  193                         if (p->p_pid == decaddr)
  194                                 return (p);
  195                 }
  196         }
  197         return ((struct proc *)addr);
  198 }

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