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 * $FreeBSD: src/gnu/usr.bin/gdb/kgdb/trgt.c,v 1.12 2008/05/01 20:36:48 jhb Exp $ 27 */ 28 29 #include <sys/cdefs.h> 30 31 #include <sys/param.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 #include <observer.h> 54 #include <arch-utils.h> 55 56 #include "kgdb.h" 57 58 static void kgdb_core_cleanup(void *); 59 60 static char *vmcore; 61 static struct target_ops kgdb_trgt_ops; 62 63 kvm_t *kvm; 64 static char kvm_err[_POSIX2_LINE_MAX]; 65 66 #define KERNOFF (kgdb_kernbase ()) 67 #define INKERNEL(x) ((x) >= KERNOFF) 68 69 static CORE_ADDR 70 kgdb_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 86 static void 87 kgdb_trgt_open(char *filename, int from_tty) 88 { 89 struct cleanup *old_chain; 90 struct kthr *kt; 91 struct inferior *inf8; 92 struct program_space *pspace; 93 kvm_t *nkvm; 94 char *temp; 95 int first_inferior = 1; 96 struct gdbarch_info info; 97 struct gdbarch *kgdbarch; 98 99 target_preopen (from_tty); 100 if (!filename) 101 error ("No vmcore file specified."); 102 if (!exec_bfd) 103 error ("Can't open a vmcore without a kernel"); 104 105 filename = tilde_expand (filename); 106 if (filename[0] != '/') { 107 temp = concat (current_directory, "/", filename, NULL); 108 xfree(filename); 109 filename = temp; 110 } 111 112 old_chain = make_cleanup (xfree, filename); 113 114 nkvm = kvm_openfiles(bfd_get_filename(exec_bfd), filename, NULL, 115 write_files ? O_RDWR : O_RDONLY, kvm_err); 116 if (nkvm == NULL) 117 error ("Failed to open vmcore: %s", kvm_err); 118 119 /* Don't free the filename now and close any previous vmcore. */ 120 discard_cleanups(old_chain); 121 unpush_target(&kgdb_trgt_ops); 122 123 kvm = nkvm; 124 vmcore = filename; 125 old_chain = make_cleanup(kgdb_core_cleanup, NULL); 126 127 push_target (&kgdb_trgt_ops); 128 discard_cleanups (old_chain); 129 130 kgdb_dmesg(); 131 132 gdbarch_info_init (&info); 133 #if defined (__i386__) 134 info.bfd_arch_info = bfd_scan_arch ("i386"); 135 #elif defined (__x86_64__) 136 info.bfd_arch_info = bfd_scan_arch ("i386:x86-64"); 137 #else 138 #error platform not recognized 139 #endif 140 info.byte_order = BFD_ENDIAN_LITTLE; 141 gdbarch_info_fill (&info); 142 kgdbarch = gdbarch_find_by_info (info); 143 144 init_thread_list(); 145 kt = kgdb_thr_init(); 146 while (kt != NULL) { 147 if (!in_inferior_list(kt->pid)) { 148 if (first_inferior) { 149 first_inferior = 0; 150 inf8 = current_inferior(); 151 inf8->pid = kt->pid; 152 inf8->attach_flag = 1; 153 inferior_appeared (inf8, kt->pid); 154 pspace = current_program_space; 155 pspace->ebfd = 0; 156 pspace->ebfd_mtime = 0; 157 } else { 158 inf8 = add_inferior(kt->pid); 159 inf8->attach_flag = 0; 160 pspace = add_program_space(new_address_space()); 161 pspace->symfile_object_file = symfile_objfile; 162 pspace->objfiles = object_files; 163 } 164 inf8->pspace = pspace; 165 inf8->aspace = pspace->aspace; 166 inf8->fake_pid_p = 0; 167 inf8->gdbarch = kgdbarch; 168 } 169 add_thread(ptid_build(kt->pid, kt->lwpid, kt->tid)); 170 kt = kgdb_thr_next(kt); 171 } 172 if (curkthr != 0) 173 inferior_ptid = ptid_build(curkthr->pid, curkthr->lwpid, 174 curkthr->tid); 175 176 frame_unwind_prepend_unwinder(kgdbarch, &kgdb_trgt_trapframe_unwind); 177 178 kld_init(kgdbarch); 179 reinit_frame_cache(); 180 select_frame (get_current_frame()); 181 print_stack_frame(get_selected_frame(NULL), 0, SRC_AND_LOC); 182 } 183 184 static void 185 kgdb_trgt_close(int quitting) 186 { 187 188 if (kvm != NULL) { 189 inferior_ptid = null_ptid; 190 clear_solib(); 191 if (kvm_close(kvm) != 0) 192 warning("cannot close \"%s\": %s", vmcore, 193 kvm_geterr(kvm)); 194 kvm = NULL; 195 xfree(vmcore); 196 vmcore = NULL; 197 } 198 } 199 200 static void 201 kgdb_core_cleanup(void *arg) 202 { 203 204 kgdb_trgt_close(0); 205 } 206 207 static void 208 kgdb_trgt_detach(struct target_ops *target, char *args, int from_tty) 209 { 210 211 if (args) 212 error ("Too many arguments"); 213 unpush_target(target); 214 reinit_frame_cache(); 215 if (from_tty) 216 printf_filtered("No vmcore file now.\n"); 217 } 218 219 static char * 220 kgdb_trgt_extra_thread_info(struct thread_info *ti) 221 { 222 223 return (kgdb_thr_extra_thread_info(ptid_get_tid(ti->ptid))); 224 } 225 226 static void 227 kgdb_trgt_files_info(struct target_ops *target) 228 { 229 230 printf_filtered ("\t`%s', ", vmcore); 231 wrap_here (" "); 232 printf_filtered ("file type %s.\n", "DragonFly kernel vmcore"); 233 } 234 235 static void 236 kgdb_trgt_find_new_threads(struct target_ops *target_ops) 237 { 238 struct target_ops *tb; 239 240 if (kvm != NULL) 241 return; 242 243 tb = find_target_beneath(target_ops); 244 if (tb->to_find_new_threads != NULL) 245 tb->to_find_new_threads(target_ops); 246 } 247 248 static char * 249 kgdb_trgt_pid_to_str(struct target_ops *target_ops __unused, ptid_t ptid) 250 { 251 return (kgdb_thr_pid_to_str(ptid)); 252 } 253 254 static int 255 kgdb_trgt_thread_alive(struct target_ops *target_ops __unused, ptid_t ptid) 256 { 257 return (kgdb_thr_lookup_tid(ptid_get_tid(ptid)) != NULL); 258 } 259 260 static LONGEST 261 kgdb_trgt_xfer_partial(struct target_ops *ops, enum target_object object, 262 const char *annex, gdb_byte *readbuf, 263 const gdb_byte *writebuf, 264 ULONGEST offset, LONGEST len) 265 { 266 if (kvm != NULL) { 267 if (len == 0) 268 return (0); 269 if (writebuf != NULL) 270 return (kvm_write(kvm, offset, writebuf, len)); 271 if (readbuf != NULL) 272 return (kvm_read(kvm, offset, readbuf, len)); 273 } 274 return (ops->beneath->to_xfer_partial(ops->beneath, object, annex, 275 readbuf, writebuf, offset, len)); 276 } 277 278 static void 279 kgdb_switch_to_thread(struct kthr *thr) 280 { 281 char buf[16]; 282 CORE_ADDR thread_id; 283 char *err; 284 285 thread_id = thr->tid; 286 if (thread_id == 0) 287 error ("invalid tid"); 288 snprintf(buf, sizeof(buf), "%lu", thread_id); 289 if (!gdb_thread_select(current_uiout, buf, &err)) 290 error ("%s", err); 291 } 292 293 static void 294 kgdb_set_proc_cmd (char *arg, int from_tty) 295 { 296 CORE_ADDR addr; 297 struct kthr *thr; 298 299 if (!arg) 300 error_no_arg ("proc address for the new context"); 301 302 if (kvm == NULL) 303 error ("only supported for core file target"); 304 305 addr = (CORE_ADDR) parse_and_eval_address (arg); 306 307 if (!INKERNEL (addr)) { 308 thr = kgdb_thr_lookup_pid((int)addr); 309 if (thr == NULL) 310 error ("invalid pid"); 311 } else { 312 thr = kgdb_thr_lookup_paddr(addr); 313 if (thr == NULL) 314 error("invalid proc address"); 315 } 316 kgdb_switch_to_thread(thr); 317 } 318 319 static void 320 kgdb_set_tid_cmd (char *arg, int from_tty) 321 { 322 CORE_ADDR addr; 323 struct kthr *thr; 324 325 if (!arg) 326 error_no_arg ("Thread address for the new context"); 327 328 addr = (CORE_ADDR) parse_and_eval_address (arg); 329 thr = kgdb_thr_lookup_taddr(addr); 330 331 if (thr == NULL) 332 error("invalid thread address"); 333 334 kgdb_switch_to_thread(thr); 335 } 336 337 int fbsdcoreops_suppress_target = 1; 338 339 void 340 initialize_kgdb_target(void) 341 { 342 kgdb_trgt_ops.to_magic = OPS_MAGIC; 343 kgdb_trgt_ops.to_shortname = "kernel"; 344 kgdb_trgt_ops.to_longname = "kernel core dump file"; 345 kgdb_trgt_ops.to_doc = 346 "Use a vmcore file as a target. Specify the filename of the vmcore file."; 347 kgdb_trgt_ops.to_stratum = process_stratum; 348 kgdb_trgt_ops.to_has_registers = default_child_has_registers; 349 kgdb_trgt_ops.to_has_memory = default_child_has_memory; 350 kgdb_trgt_ops.to_has_stack = default_child_has_stack; 351 352 kgdb_trgt_ops.to_open = kgdb_trgt_open; 353 kgdb_trgt_ops.to_close = kgdb_trgt_close; 354 kgdb_trgt_ops.to_attach = find_default_attach; 355 kgdb_trgt_ops.to_detach = kgdb_trgt_detach; 356 kgdb_trgt_ops.to_extra_thread_info = kgdb_trgt_extra_thread_info; 357 kgdb_trgt_ops.to_fetch_registers = kgdb_trgt_fetch_registers; 358 kgdb_trgt_ops.to_files_info = kgdb_trgt_files_info; 359 kgdb_trgt_ops.to_find_new_threads = kgdb_trgt_find_new_threads; 360 kgdb_trgt_ops.to_pid_to_str = kgdb_trgt_pid_to_str; 361 /* 362 kgdb_trgt_ops.to_store_registers = NULL; 363 */ 364 kgdb_trgt_ops.to_thread_alive = kgdb_trgt_thread_alive; 365 kgdb_trgt_ops.to_xfer_partial = kgdb_trgt_xfer_partial; 366 add_target(&kgdb_trgt_ops); 367 368 add_com ("proc", class_obscure, kgdb_set_proc_cmd, 369 "Set current process context"); 370 add_com ("tid", class_obscure, kgdb_set_tid_cmd, 371 "Set current thread context"); 372 } 373