text: /*-
   * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   *
   * Copyright (c) 2004 Marcel Moolenaar
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD$");
  
  #include <sys/param.h>
  #include <sys/systm.h>
  #include <sys/kdb.h>
  #include <sys/proc.h>
  
  #include <machine/pcb.h>
  
  #include <ddb/ddb.h>
  #include <ddb/db_command.h>
  #include <ddb/db_sym.h>
  
  void
  db_print_thread(void)
  {
  	pid_t pid;
  
  	pid = -1;
  	if (kdb_thread->td_proc != NULL)
  		pid = kdb_thread->td_proc->p_pid;
  	db_printf("[ thread pid %d tid %ld ]\n", pid, (long)kdb_thread->td_tid);
  }
  
  void
  db_set_thread(db_expr_t tid, bool hastid, db_expr_t cnt, char *mod)
  {
  	struct thread *thr;
  	int err;
  
  	if (hastid) {
  		thr = db_lookup_thread(tid, false);
  		if (thr != NULL) {
  			err = kdb_thr_select(thr);
  			if (err != 0) {
  				db_printf("unable to switch to thread %ld\n",
  				    (long)thr->td_tid);
  				return;
  			}
  			db_dot = PC_REGS();
  		} else {
  			db_printf("%d: invalid thread\n", (int)tid);
  			return;
  		}
  	}
  
  	db_print_thread();
  	db_print_loc_and_inst(PC_REGS());
  }
  
  void
  db_show_threads(db_expr_t addr, bool hasaddr, db_expr_t cnt, char *mod)
  {
  	jmp_buf jb;
  	void *prev_jb;
  	struct thread *thr;
  
  	thr = kdb_thr_first();
  	while (!db_pager_quit && thr != NULL) {
  		db_printf("  %6ld (%p) (stack %p)  ", (long)thr->td_tid, thr,
  		    (void *)thr->td_kstack);
  		prev_jb = kdb_jmpbuf(jb);
  		if (setjmp(jb) == 0) {
  			if (db_trace_thread(thr, 1) != 0)
  				db_printf("***\n");
  		}
  		kdb_jmpbuf(prev_jb);
  		thr = kdb_thr_next(thr);
  	}
  }
  
  /*
   * Lookup a thread based on a db expression address.  We assume that the
   * address was parsed in hexadecimal.  We reparse the address in decimal
   * first and try to treat it as a thread ID to find an associated thread.
   * If that fails and check_pid is true, we treat the decimal value as a
   * PID.  If that matches a process, we return the first thread in that
   * process.  Otherwise, we treat the addr as a pointer to a thread.
   */
  struct thread *
  db_lookup_thread(db_expr_t addr, bool check_pid)
  {
  	struct thread *td;
  	db_expr_t decaddr;
  	struct proc *p;
  
  	/*
  	 * If the parsed address was not a valid decimal expression,
  	 * assume it is a thread pointer.
  	 */
  	decaddr = db_hex2dec(addr);
  	if (decaddr == -1)
  		return ((struct thread *)addr);
  
  	td = kdb_thr_lookup(decaddr);
  	if (td != NULL)
  		return (td);
  	if (check_pid) {
  		LIST_FOREACH(p, PIDHASH(decaddr), p_hash) {
  			if (p->p_pid == decaddr)
  				return (FIRST_THREAD_IN_PROC(p));
  		}
  	}
  	return ((struct thread *)addr);
  }
  
  /*
   * Lookup a process based on a db expression address.  We assume that the
   * address was parsed in hexadecimal.  We reparse the address in decimal
   * first and try to treat it as a PID to find an associated process.
   * If that fails we treat the addr as a pointer to a process.
   */
  struct proc *
  db_lookup_proc(db_expr_t addr)
  {
  	db_expr_t decaddr;
  	struct proc *p;
  
  	decaddr = db_hex2dec(addr);
  	if (decaddr != -1) {
  		LIST_FOREACH(p, PIDHASH(decaddr), p_hash) {
  			if (p->p_pid == decaddr)
  				return (p);
  		}
  	}
  	return ((struct proc *)addr);
  }
  