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/proc.h> 32#include <sys/sysctl.h> 33#include <sys/user.h> 34#include <err.h> 35#include <fcntl.h> 36#include <kvm.h> 37 38#include <defs.h> 39#include <readline/readline.h> 40#include <readline/tilde.h> 41#include <command.h> 42#include <exec.h> 43#include <frame-unwind.h> 44#include <gdb.h> 45#include <gdbcore.h> 46#include <gdbthread.h> 47#include <inferior.h> 48#include <language.h> 49#include <regcache.h> 50#include <solib.h> 51#include <target.h> 52#include <ui-out.h> 53 54#include "kgdb.h" 55 56static CORE_ADDR stoppcbs; 57 58static void kgdb_core_cleanup(void *); 59 60static char *vmcore; 61static struct target_ops kgdb_trgt_ops; 62 63kvm_t *kvm; 64static char kvm_err[_POSIX2_LINE_MAX]; 65 66#define KERNOFF (kgdb_kernbase ()) 67#define INKERNEL(x) ((x) >= KERNOFF) 68 69static CORE_ADDR 70kgdb_kernbase (void) 71{ 72 static CORE_ADDR kernbase; 73 struct minimal_symbol *sym; 74 75 if (kernbase == 0) { 76 sym = lookup_minimal_symbol ("kernbase", NULL, NULL); 77 if (sym == NULL) { 78 kernbase = KERNBASE; 79 } else { 80 kernbase = SYMBOL_VALUE_ADDRESS (sym); 81 } 82 } 83 return kernbase; 84} 85 86static void 87kgdb_trgt_open(char *filename, int from_tty) 88{ 89 struct cleanup *old_chain; 90 struct thread_info *ti; 91 struct kthr *kt; 92 kvm_t *nkvm; 93 char *temp; 94 int ontop; 95 96 target_preopen (from_tty); 97 if (!filename) 98 error ("No vmcore file specified."); 99 if (!exec_bfd) 100 error ("Can't open a vmcore without a kernel"); 101 102 filename = tilde_expand (filename); 103 if (filename[0] != '/') { 104 temp = concat (current_directory, "/", filename, NULL); 105 xfree(filename); 106 filename = temp; 107 } 108 109 old_chain = make_cleanup (xfree, filename); 110 111 nkvm = kvm_openfiles(bfd_get_filename(exec_bfd), filename, NULL, 112 write_files ? O_RDWR : O_RDONLY, kvm_err); 113 if (nkvm == NULL) 114 error ("Failed to open vmcore: %s", kvm_err); 115 116 /* Don't free the filename now and close any previous vmcore. */ 117 discard_cleanups(old_chain); 118 unpush_target(&kgdb_trgt_ops); 119 120 kvm = nkvm; 121 vmcore = filename; 122 old_chain = make_cleanup(kgdb_core_cleanup, NULL); 123 124 ontop = !push_target (&kgdb_trgt_ops); 125 discard_cleanups (old_chain); 126 127 kgdb_dmesg(); 128 129 init_thread_list(); 130 kt = kgdb_thr_init(); 131 while (kt != NULL) { 132 ti = add_thread(pid_to_ptid(kt->tid)); 133 kt = kgdb_thr_next(kt); 134 } 135 if (curkthr != 0) 136 inferior_ptid = pid_to_ptid(curkthr->tid); 137 138 if (ontop) { 139 /* XXX: fetch registers? */ 140 kld_init(); 141 flush_cached_frames(); 142 select_frame (get_current_frame()); 143 print_stack_frame(get_selected_frame(), 144 frame_relative_level(get_selected_frame()), 1); 145 } else 146 warning( 147 "you won't be able to access this vmcore until you terminate\n\ 148your %s; do ``info files''", target_longname); 149} 150 151static void 152kgdb_trgt_close(int quitting) 153{ 154 155 if (kvm != NULL) { 156 inferior_ptid = null_ptid; 157 CLEAR_SOLIB(); 158 if (kvm_close(kvm) != 0) 159 warning("cannot close \"%s\": %s", vmcore, 160 kvm_geterr(kvm)); 161 kvm = NULL; 162 xfree(vmcore); 163 vmcore = NULL; 164 if (kgdb_trgt_ops.to_sections) { 165 xfree(kgdb_trgt_ops.to_sections); 166 kgdb_trgt_ops.to_sections = NULL; 167 kgdb_trgt_ops.to_sections_end = NULL; 168 } 169 } 170} 171 172static void 173kgdb_core_cleanup(void *arg) 174{ 175 176 kgdb_trgt_close(0); 177} 178 179static void 180kgdb_trgt_detach(char *args, int from_tty) 181{ 182 183 if (args) 184 error ("Too many arguments"); 185 unpush_target(&kgdb_trgt_ops); 186 reinit_frame_cache(); 187 if (from_tty) 188 printf_filtered("No vmcore file now.\n"); 189} 190 191static char * 192kgdb_trgt_extra_thread_info(struct thread_info *ti) 193{ 194 195 return (kgdb_thr_extra_thread_info(ptid_get_pid(ti->ptid))); 196} 197 198static void 199kgdb_trgt_files_info(struct target_ops *target) 200{ 201 202 printf_filtered ("\t`%s', ", vmcore); 203 wrap_here (" "); 204 printf_filtered ("file type %s.\n", "FreeBSD kernel vmcore"); 205} 206 207static void 208kgdb_trgt_find_new_threads(void) 209{ 210 struct target_ops *tb; 211 212 if (kvm != NULL) 213 return; 214 215 tb = find_target_beneath(&kgdb_trgt_ops); 216 if (tb->to_find_new_threads != NULL) 217 tb->to_find_new_threads(); 218} 219 220static char * 221kgdb_trgt_pid_to_str(ptid_t ptid) 222{ 223 static char buf[33]; 224 225 snprintf(buf, sizeof(buf), "Thread %d", ptid_get_pid(ptid)); 226 return (buf); 227} 228 229static int 230kgdb_trgt_thread_alive(ptid_t ptid) 231{ 232 return (kgdb_thr_lookup_tid(ptid_get_pid(ptid)) != NULL); 233} 234 235static int 236kgdb_trgt_xfer_memory(CORE_ADDR memaddr, char *myaddr, int len, int write, 237 struct mem_attrib *attrib, struct target_ops *target) 238{ 239 struct target_ops *tb; 240 241 if (kvm != NULL) { 242 if (len == 0) 243 return (0); 244 if (!write) 245 return (kvm_read(kvm, memaddr, myaddr, len)); 246 else 247 return (kvm_write(kvm, memaddr, myaddr, len)); 248 } 249 tb = find_target_beneath(target); 250 return (tb->to_xfer_memory(memaddr, myaddr, len, write, attrib, tb)); 251} 252 253static int 254kgdb_trgt_ignore_breakpoints(CORE_ADDR addr, char *contents) 255{ 256 257 return 0; 258} 259 260static void 261kgdb_switch_to_thread(int tid) 262{ 263 char buf[16]; 264 int thread_id; 265 266 thread_id = pid_to_thread_id(pid_to_ptid(tid)); 267 if (thread_id == 0) 268 error ("invalid tid"); 269 snprintf(buf, sizeof(buf), "%d", thread_id); 270 gdb_thread_select(uiout, buf); 271} 272 273static void 274kgdb_set_proc_cmd (char *arg, int from_tty) 275{ 276 CORE_ADDR addr; 277 struct kthr *thr; 278 279 if (!arg) 280 error_no_arg ("proc address for the new context"); 281 282 if (kvm == NULL) 283 error ("only supported for core file target"); 284 285 addr = (CORE_ADDR) parse_and_eval_address (arg); 286 287 if (!INKERNEL (addr)) { 288 thr = kgdb_thr_lookup_pid((int)addr); 289 if (thr == NULL) 290 error ("invalid pid"); 291 } else { 292 thr = kgdb_thr_lookup_paddr(addr); 293 if (thr == NULL) 294 error("invalid proc address"); 295 } 296 kgdb_switch_to_thread(thr->tid); 297} 298 299static void 300kgdb_set_tid_cmd (char *arg, int from_tty) 301{ 302 CORE_ADDR addr; 303 struct kthr *thr; 304 305 if (!arg) 306 error_no_arg ("TID or thread address for the new context"); 307 308 addr = (CORE_ADDR) parse_and_eval_address (arg); 309 310 if (kvm != NULL && INKERNEL (addr)) { 311 thr = kgdb_thr_lookup_taddr(addr); 312 if (thr == NULL) 313 error("invalid thread address"); 314 addr = thr->tid; 315 } 316 kgdb_switch_to_thread(addr); 317} 318 319int fbsdcoreops_suppress_target = 1; 320 321void 322initialize_kgdb_target(void) 323{ 324 325 kgdb_trgt_ops.to_magic = OPS_MAGIC; 326 kgdb_trgt_ops.to_shortname = "kernel"; 327 kgdb_trgt_ops.to_longname = "kernel core dump file"; 328 kgdb_trgt_ops.to_doc = 329 "Use a vmcore file as a target. Specify the filename of the vmcore file."; 330 kgdb_trgt_ops.to_stratum = core_stratum; 331 kgdb_trgt_ops.to_has_memory = 1; 332 kgdb_trgt_ops.to_has_registers = 1; 333 kgdb_trgt_ops.to_has_stack = 1; 334 335 kgdb_trgt_ops.to_open = kgdb_trgt_open; 336 kgdb_trgt_ops.to_close = kgdb_trgt_close; 337 kgdb_trgt_ops.to_attach = find_default_attach; 338 kgdb_trgt_ops.to_detach = kgdb_trgt_detach; 339 kgdb_trgt_ops.to_extra_thread_info = kgdb_trgt_extra_thread_info; 340 kgdb_trgt_ops.to_fetch_registers = kgdb_trgt_fetch_registers; 341 kgdb_trgt_ops.to_files_info = kgdb_trgt_files_info; 342 kgdb_trgt_ops.to_find_new_threads = kgdb_trgt_find_new_threads; 343 kgdb_trgt_ops.to_pid_to_str = kgdb_trgt_pid_to_str; 344 kgdb_trgt_ops.to_store_registers = kgdb_trgt_store_registers; 345 kgdb_trgt_ops.to_thread_alive = kgdb_trgt_thread_alive; 346 kgdb_trgt_ops.to_xfer_memory = kgdb_trgt_xfer_memory; 347 kgdb_trgt_ops.to_insert_breakpoint = kgdb_trgt_ignore_breakpoints; 348 kgdb_trgt_ops.to_remove_breakpoint = kgdb_trgt_ignore_breakpoints; 349 350 add_target(&kgdb_trgt_ops); 351 352 add_com ("proc", class_obscure, kgdb_set_proc_cmd, 353 "Set current process context"); 354 add_com ("tid", class_obscure, kgdb_set_tid_cmd, 355 "Set current thread context"); 356} 357 358CORE_ADDR 359kgdb_trgt_stop_pcb(u_int cpuid, u_int pcbsz) 360{ 361 static int once = 0; 362 363 if (stoppcbs == 0 && !once) { 364 once = 1; 365 stoppcbs = kgdb_lookup("stoppcbs"); 366 } 367 if (stoppcbs == 0) 368 return 0; 369 370 return (stoppcbs + pcbsz * cpuid); 371} 372