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 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, bool 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) (stack %p) ", (long)thr->td_tid, thr, 100 (void *)thr->td_kstack); 101 prev_jb = kdb_jmpbuf(jb); 102 if (setjmp(jb) == 0) { 103 if (db_trace_thread(thr, 1) != 0) 104 db_printf("***\n"); 105 } 106 kdb_jmpbuf(prev_jb); 107 thr = kdb_thr_next(thr); 108 } 109 } 110 111 /* 112 * Lookup a thread based on a db expression address. We assume that the 113 * address was parsed in hexadecimal. We reparse the address in decimal 114 * first and try to treat it as a thread ID to find an associated thread. 115 * If that fails and check_pid is true, we treat the decimal value as a 116 * PID. If that matches a process, we return the first thread in that 117 * process. Otherwise, we treat the addr as a pointer to a thread. 118 */ 119 struct thread * 120 db_lookup_thread(db_expr_t addr, bool check_pid) 121 { 122 struct thread *td; 123 db_expr_t decaddr; 124 struct proc *p; 125 126 /* 127 * If the parsed address was not a valid decimal expression, 128 * assume it is a thread pointer. 129 */ 130 decaddr = db_hex2dec(addr); 131 if (decaddr == -1) 132 return ((struct thread *)addr); 133 134 td = kdb_thr_lookup(decaddr); 135 if (td != NULL) 136 return (td); 137 if (check_pid) { 138 FOREACH_PROC_IN_SYSTEM(p) { 139 if (p->p_pid == decaddr) 140 return (FIRST_THREAD_IN_PROC(p)); 141 } 142 LIST_FOREACH(p, &zombproc, p_list) { 143 if (p->p_pid == decaddr) 144 return (FIRST_THREAD_IN_PROC(p)); 145 } 146 } 147 return ((struct thread *)addr); 148 } 149 150 /* 151 * Lookup a process based on a db expression address. We assume that the 152 * address was parsed in hexadecimal. We reparse the address in decimal 153 * first and try to treat it as a PID to find an associated process. 154 * If that fails we treat the addr as a pointer to a process. 155 */ 156 struct proc * 157 db_lookup_proc(db_expr_t addr) 158 { 159 db_expr_t decaddr; 160 struct proc *p; 161 162 decaddr = db_hex2dec(addr); 163 if (decaddr != -1) { 164 FOREACH_PROC_IN_SYSTEM(p) { 165 if (p->p_pid == decaddr) 166 return (p); 167 } 168 LIST_FOREACH(p, &zombproc, p_list) { 169 if (p->p_pid == decaddr) 170 return (p); 171 } 172 } 173 return ((struct proc *)addr); 174 } 175