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/param.h> 30 #include <sys/systm.h> 31 #include <sys/kdb.h> 32 #include <sys/proc.h> 33 34 #include <machine/pcb.h> 35 36 #include <ddb/ddb.h> 37 #include <ddb/db_command.h> 38 #include <ddb/db_sym.h> 39 40 void 41 db_print_thread(void) 42 { 43 pid_t pid; 44 45 pid = -1; 46 if (kdb_thread->td_proc != NULL) 47 pid = kdb_thread->td_proc->p_pid; 48 db_printf("[ thread pid %d tid %ld ]\n", pid, (long)kdb_thread->td_tid); 49 } 50 51 void 52 db_set_thread(db_expr_t tid, bool hastid, db_expr_t cnt, char *mod) 53 { 54 struct thread *thr; 55 int err; 56 57 if (hastid) { 58 thr = db_lookup_thread(tid, false); 59 if (thr != NULL) { 60 err = kdb_thr_select(thr); 61 if (err != 0) { 62 db_printf("unable to switch to thread %ld\n", 63 (long)thr->td_tid); 64 return; 65 } 66 db_dot = PC_REGS(); 67 } else { 68 db_printf("%d: invalid thread\n", (int)tid); 69 return; 70 } 71 } 72 73 db_print_thread(); 74 db_print_loc_and_inst(PC_REGS()); 75 } 76 77 void 78 db_show_threads(db_expr_t addr, bool hasaddr, db_expr_t cnt, char *mod) 79 { 80 jmp_buf jb; 81 void *prev_jb; 82 struct thread *thr; 83 84 thr = kdb_thr_first(); 85 while (!db_pager_quit && thr != NULL) { 86 db_printf(" %6ld (%p) (stack %p) ", (long)thr->td_tid, thr, 87 (void *)thr->td_kstack); 88 prev_jb = kdb_jmpbuf(jb); 89 if (setjmp(jb) == 0) { 90 if (thr->td_proc->p_flag & P_INMEM) { 91 if (db_trace_thread(thr, 1) != 0) 92 db_printf("***\n"); 93 } else 94 db_printf("*** swapped out\n"); 95 } 96 kdb_jmpbuf(prev_jb); 97 thr = kdb_thr_next(thr); 98 } 99 } 100 101 /* 102 * Lookup a thread based on a db expression address. We assume that the 103 * address was parsed in hexadecimal. We reparse the address in decimal 104 * first and try to treat it as a thread ID to find an associated thread. 105 * If that fails and check_pid is true, we treat the decimal value as a 106 * PID. If that matches a process, we return the first thread in that 107 * process. Otherwise, we treat the addr as a pointer to a thread. 108 */ 109 struct thread * 110 db_lookup_thread(db_expr_t addr, bool check_pid) 111 { 112 struct thread *td; 113 db_expr_t decaddr; 114 115 /* 116 * If the parsed address was not a valid decimal expression, 117 * assume it is a thread pointer. 118 */ 119 decaddr = db_hex2dec(addr); 120 if (decaddr == -1) 121 return ((struct thread *)addr); 122 123 td = kdb_thr_lookup(decaddr); 124 if (td != NULL) 125 return (td); 126 if (check_pid) { 127 td = kdb_thr_from_pid(decaddr); 128 if (td != NULL) 129 return (td); 130 } 131 return ((struct thread *)addr); 132 } 133 134 /* 135 * Lookup a process based on a db expression address. We assume that the 136 * address was parsed in hexadecimal. We reparse the address in decimal 137 * first and try to treat it as a PID to find an associated process. 138 * If that fails we treat the addr as a pointer to a process. 139 */ 140 struct proc * 141 db_lookup_proc(db_expr_t addr) 142 { 143 db_expr_t decaddr; 144 struct proc *p; 145 146 decaddr = db_hex2dec(addr); 147 if (decaddr != -1) { 148 LIST_FOREACH(p, PIDHASH(decaddr), p_hash) { 149 if (p->p_pid == decaddr) 150 return (p); 151 } 152 } 153 return ((struct proc *)addr); 154 } 155