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("$FreeBSD$"); 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 int err; 59 60 if (hastid) { 61 thr = db_lookup_thread(tid, false); 62 if (thr != NULL) { 63 err = kdb_thr_select(thr); 64 if (err != 0) { 65 db_printf("unable to switch to thread %ld\n", 66 (long)thr->td_tid); 67 return; 68 } 69 db_dot = PC_REGS(); 70 } else { 71 db_printf("%d: invalid thread\n", (int)tid); 72 return; 73 } 74 } 75 76 db_print_thread(); 77 db_print_loc_and_inst(PC_REGS()); 78 } 79 80 void 81 db_show_threads(db_expr_t addr, bool hasaddr, db_expr_t cnt, char *mod) 82 { 83 jmp_buf jb; 84 void *prev_jb; 85 struct thread *thr; 86 87 thr = kdb_thr_first(); 88 while (!db_pager_quit && thr != NULL) { 89 db_printf(" %6ld (%p) (stack %p) ", (long)thr->td_tid, thr, 90 (void *)thr->td_kstack); 91 prev_jb = kdb_jmpbuf(jb); 92 if (setjmp(jb) == 0) { 93 if (thr->td_proc->p_flag & P_INMEM) { 94 if (db_trace_thread(thr, 1) != 0) 95 db_printf("***\n"); 96 } else 97 db_printf("*** swapped out\n"); 98 } 99 kdb_jmpbuf(prev_jb); 100 thr = kdb_thr_next(thr); 101 } 102 } 103 104 /* 105 * Lookup a thread based on a db expression address. We assume that the 106 * address was parsed in hexadecimal. We reparse the address in decimal 107 * first and try to treat it as a thread ID to find an associated thread. 108 * If that fails and check_pid is true, we treat the decimal value as a 109 * PID. If that matches a process, we return the first thread in that 110 * process. Otherwise, we treat the addr as a pointer to a thread. 111 */ 112 struct thread * 113 db_lookup_thread(db_expr_t addr, bool check_pid) 114 { 115 struct thread *td; 116 db_expr_t decaddr; 117 118 /* 119 * If the parsed address was not a valid decimal expression, 120 * assume it is a thread pointer. 121 */ 122 decaddr = db_hex2dec(addr); 123 if (decaddr == -1) 124 return ((struct thread *)addr); 125 126 td = kdb_thr_lookup(decaddr); 127 if (td != NULL) 128 return (td); 129 if (check_pid) { 130 td = kdb_thr_from_pid(decaddr); 131 if (td != NULL) 132 return (td); 133 } 134 return ((struct thread *)addr); 135 } 136 137 /* 138 * Lookup a process based on a db expression address. We assume that the 139 * address was parsed in hexadecimal. We reparse the address in decimal 140 * first and try to treat it as a PID to find an associated process. 141 * If that fails we treat the addr as a pointer to a process. 142 */ 143 struct proc * 144 db_lookup_proc(db_expr_t addr) 145 { 146 db_expr_t decaddr; 147 struct proc *p; 148 149 decaddr = db_hex2dec(addr); 150 if (decaddr != -1) { 151 LIST_FOREACH(p, PIDHASH(decaddr), p_hash) { 152 if (p->p_pid == decaddr) 153 return (p); 154 } 155 } 156 return ((struct proc *)addr); 157 } 158