gnu/usr.bin/gdb/kgdb/trgt.c

   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 }