1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 #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, bool hastid, db_expr_t cnt, char *mod) 54 { 55 struct thread *thr; 56 int err; 57 58 if (hastid) { 59 thr = db_lookup_thread(tid, false); 60 if (thr != NULL) { 61 err = kdb_thr_select(thr); 62 if (err != 0) { 63 db_printf("unable to switch to thread %ld\n", 64 (long)thr->td_tid); 65 return; 66 } 67 db_dot = PC_REGS(); 68 } else { 69 db_printf("%d: invalid thread\n", (int)tid); 70 return; 71 } 72 } 73 74 db_print_thread(); 75 db_print_loc_and_inst(PC_REGS()); 76 } 77 78 void 79 db_show_threads(db_expr_t addr, bool hasaddr, db_expr_t cnt, char *mod) 80 { 81 jmp_buf jb; 82 void *prev_jb; 83 struct thread *thr; 84 85 thr = kdb_thr_first(); 86 while (!db_pager_quit && thr != NULL) { 87 db_printf(" %6ld (%p) (stack %p) ", (long)thr->td_tid, thr, 88 (void *)thr->td_kstack); 89 prev_jb = kdb_jmpbuf(jb); 90 if (setjmp(jb) == 0) { 91 if (thr->td_proc->p_flag & P_INMEM) { 92 if (db_trace_thread(thr, 1) != 0) 93 db_printf("***\n"); 94 } else 95 db_printf("*** swapped out\n"); 96 } 97 kdb_jmpbuf(prev_jb); 98 thr = kdb_thr_next(thr); 99 } 100 } 101 102 /* 103 * Lookup a thread based on a db expression address. We assume that the 104 * address was parsed in hexadecimal. We reparse the address in decimal 105 * first and try to treat it as a thread ID to find an associated thread. 106 * If that fails and check_pid is true, we treat the decimal value as a 107 * PID. If that matches a process, we return the first thread in that 108 * process. Otherwise, we treat the addr as a pointer to a thread. 109 */ 110 struct thread * 111 db_lookup_thread(db_expr_t addr, bool check_pid) 112 { 113 struct thread *td; 114 db_expr_t decaddr; 115 116 /* 117 * If the parsed address was not a valid decimal expression, 118 * assume it is a thread pointer. 119 */ 120 decaddr = db_hex2dec(addr); 121 if (decaddr == -1) 122 return ((struct thread *)addr); 123 124 td = kdb_thr_lookup(decaddr); 125 if (td != NULL) 126 return (td); 127 if (check_pid) { 128 td = kdb_thr_from_pid(decaddr); 129 if (td != NULL) 130 return (td); 131 } 132 return ((struct thread *)addr); 133 } 134 135 /* 136 * Lookup a process 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 PID to find an associated process. 139 * If that fails we treat the addr as a pointer to a process. 140 */ 141 struct proc * 142 db_lookup_proc(db_expr_t addr) 143 { 144 db_expr_t decaddr; 145 struct proc *p; 146 147 decaddr = db_hex2dec(addr); 148 if (decaddr != -1) { 149 LIST_FOREACH(p, PIDHASH(decaddr), p_hash) { 150 if (p->p_pid == decaddr) 151 return (p); 152 } 153 } 154 return ((struct proc *)addr); 155 } 156