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 int pager_quit; 97 98 db_setup_paging(db_simple_pager, &pager_quit, db_lines_per_page); 99 100 pager_quit = 0; 101 thr = kdb_thr_first(); 102 while (!pager_quit && thr != NULL) { 103 db_printf(" %6ld (%p) ", (long)thr->td_tid, thr); 104 prev_jb = kdb_jmpbuf(jb); 105 if (setjmp(jb) == 0) { 106 if (db_trace_thread(thr, 1) != 0) 107 db_printf("***\n"); 108 } 109 kdb_jmpbuf(prev_jb); 110 thr = kdb_thr_next(thr); 111 } 112 } 113 114 /* 115 * Take the parsed expression value from the command line that was parsed 116 * as a hexadecimal value and convert it as if the expression was parsed 117 * as a decimal value. Returns -1 if the expression was not a valid 118 * decimal value. 119 */ 120 static db_expr_t 121 hex2dec(db_expr_t expr) 122 { 123 uintptr_t x, y; 124 db_expr_t val; 125 126 y = 1; 127 val = 0; 128 x = expr; 129 while (x != 0) { 130 if (x % 16 > 9) 131 return (-1); 132 val += (x % 16) * (y); 133 x >>= 4; 134 y *= 10; 135 } 136 return (val); 137 } 138 139 /* 140 * Lookup a thread based on a db expression address. We assume that the 141 * address was parsed in hexadecimal. We reparse the address in decimal 142 * first and try to treat it as a thread ID to find an associated thread. 143 * If that fails and check_pid is true, we terat the decimal value as a 144 * PID. If that matches a process, we return the first thread in that 145 * process. Otherwise, we treat the addr as a pointer to a thread. 146 */ 147 struct thread * 148 db_lookup_thread(db_expr_t addr, boolean_t check_pid) 149 { 150 struct thread *td; 151 db_expr_t decaddr; 152 struct proc *p; 153 154 /* 155 * If the parsed address was not a valid decimal expression, 156 * assume it is a thread pointer. 157 */ 158 decaddr = hex2dec(addr); 159 if (decaddr == -1) 160 return ((struct thread *)addr); 161 162 td = kdb_thr_lookup(decaddr); 163 if (td != NULL) 164 return (td); 165 if (check_pid) { 166 LIST_FOREACH(p, &allproc, p_list) { 167 if (p->p_pid == decaddr) 168 return (FIRST_THREAD_IN_PROC(p)); 169 } 170 LIST_FOREACH(p, &zombproc, p_list) { 171 if (p->p_pid == decaddr) 172 return (FIRST_THREAD_IN_PROC(p)); 173 } 174 } 175 return ((struct thread *)addr); 176 } 177 178 /* 179 * Lookup a process based on a db expression address. We assume that the 180 * address was parsed in hexadecimal. We reparse the address in decimal 181 * first and try to treat it as a PID to find an associated process. 182 * If that fails we treat the addr as a pointer to a process. 183 */ 184 struct proc * 185 db_lookup_proc(db_expr_t addr) 186 { 187 db_expr_t decaddr; 188 struct proc *p; 189 190 decaddr = hex2dec(addr); 191 if (decaddr != -1) { 192 LIST_FOREACH(p, &allproc, p_list) { 193 if (p->p_pid == decaddr) 194 return (p); 195 } 196 LIST_FOREACH(p, &zombproc, p_list) { 197 if (p->p_pid == decaddr) 198 return (p); 199 } 200 } 201 return ((struct proc *)addr); 202 } 203