1 /*- 2 * Copyright (c) 2004 Marcel Moolenaar 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 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 static db_expr_t hex2dec(db_expr_t expr); 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, boolean_t 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, boolean_t 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) ", (long)thr->td_tid, thr); 100 prev_jb = kdb_jmpbuf(jb); 101 if (setjmp(jb) == 0) { 102 if (db_trace_thread(thr, 1) != 0) 103 db_printf("***\n"); 104 } 105 kdb_jmpbuf(prev_jb); 106 thr = kdb_thr_next(thr); 107 } 108 } 109 110 /* 111 * Take the parsed expression value from the command line that was parsed 112 * as a hexadecimal value and convert it as if the expression was parsed 113 * as a decimal value. Returns -1 if the expression was not a valid 114 * decimal value. 115 */ 116 static db_expr_t 117 hex2dec(db_expr_t expr) 118 { 119 uintptr_t x, y; 120 db_expr_t val; 121 122 y = 1; 123 val = 0; 124 x = expr; 125 while (x != 0) { 126 if (x % 16 > 9) 127 return (-1); 128 val += (x % 16) * (y); 129 x >>= 4; 130 y *= 10; 131 } 132 return (val); 133 } 134 135 /* 136 * Lookup a thread 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 thread ID to find an associated thread. 139 * If that fails and check_pid is true, we terat the decimal value as a 140 * PID. If that matches a process, we return the first thread in that 141 * process. Otherwise, we treat the addr as a pointer to a thread. 142 */ 143 struct thread * 144 db_lookup_thread(db_expr_t addr, boolean_t check_pid) 145 { 146 struct thread *td; 147 db_expr_t decaddr; 148 struct proc *p; 149 150 /* 151 * If the parsed address was not a valid decimal expression, 152 * assume it is a thread pointer. 153 */ 154 decaddr = hex2dec(addr); 155 if (decaddr == -1) 156 return ((struct thread *)addr); 157 158 td = kdb_thr_lookup(decaddr); 159 if (td != NULL) 160 return (td); 161 if (check_pid) { 162 FOREACH_PROC_IN_SYSTEM(p) { 163 if (p->p_pid == decaddr) 164 return (FIRST_THREAD_IN_PROC(p)); 165 } 166 LIST_FOREACH(p, &zombproc, p_list) { 167 if (p->p_pid == decaddr) 168 return (FIRST_THREAD_IN_PROC(p)); 169 } 170 } 171 return ((struct thread *)addr); 172 } 173 174 /* 175 * Lookup a process based on a db expression address. We assume that the 176 * address was parsed in hexadecimal. We reparse the address in decimal 177 * first and try to treat it as a PID to find an associated process. 178 * If that fails we treat the addr as a pointer to a process. 179 */ 180 struct proc * 181 db_lookup_proc(db_expr_t addr) 182 { 183 db_expr_t decaddr; 184 struct proc *p; 185 186 decaddr = hex2dec(addr); 187 if (decaddr != -1) { 188 FOREACH_PROC_IN_SYSTEM(p) { 189 if (p->p_pid == decaddr) 190 return (p); 191 } 192 LIST_FOREACH(p, &zombproc, p_list) { 193 if (p->p_pid == decaddr) 194 return (p); 195 } 196 } 197 return ((struct proc *)addr); 198 } 199