gdb/windows-tdep.c

   1 /* Copyright (C) 2008-2015 Free Software Foundation, Inc.
   2
   3    This file is part of GDB.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include "defs.h"
  19 #include "windows-tdep.h"
  20 #include "gdb_obstack.h"
  21 #include "xml-support.h"
  22 #include "gdbarch.h"
  23 #include "target.h"
  24 #include "value.h"
  25 #include "inferior.h"
  26 #include "command.h"
  27 #include "gdbcmd.h"
  28 #include "gdbthread.h"
  29 #include "objfiles.h"
  30 #include "symfile.h"
  31 #include "coff-pe-read.h"
  32 #include "gdb_bfd.h"
  33 #include "complaints.h"
  34 #include "solib.h"
  35 #include "solib-target.h"
  36
  37 struct cmd_list_element *info_w32_cmdlist;
  38
  39 typedef struct thread_information_block_32
  40   {
  41     uint32_t current_seh;                       /* %fs:0x0000 */
  42     uint32_t current_top_of_stack;              /* %fs:0x0004 */
  43     uint32_t current_bottom_of_stack;           /* %fs:0x0008 */
  44     uint32_t sub_system_tib;                    /* %fs:0x000c */
  45     uint32_t fiber_data;                        /* %fs:0x0010 */
  46     uint32_t arbitrary_data_slot;               /* %fs:0x0014 */
  47     uint32_t linear_address_tib;                /* %fs:0x0018 */
  48     uint32_t environment_pointer;               /* %fs:0x001c */
  49     uint32_t process_id;                        /* %fs:0x0020 */
  50     uint32_t current_thread_id;                 /* %fs:0x0024 */
  51     uint32_t active_rpc_handle;                 /* %fs:0x0028 */
  52     uint32_t thread_local_storage;              /* %fs:0x002c */
  53     uint32_t process_environment_block;         /* %fs:0x0030 */
  54     uint32_t last_error_number;                 /* %fs:0x0034 */
  55   }
  56 thread_information_32;
  57
  58 typedef struct thread_information_block_64
  59   {
  60     uint64_t current_seh;                       /* %gs:0x0000 */
  61     uint64_t current_top_of_stack;              /* %gs:0x0008 */
  62     uint64_t current_bottom_of_stack;           /* %gs:0x0010 */
  63     uint64_t sub_system_tib;                    /* %gs:0x0018 */
  64     uint64_t fiber_data;                        /* %gs:0x0020 */
  65     uint64_t arbitrary_data_slot;               /* %gs:0x0028 */
  66     uint64_t linear_address_tib;                /* %gs:0x0030 */
  67     uint64_t environment_pointer;               /* %gs:0x0038 */
  68     uint64_t process_id;                        /* %gs:0x0040 */
  69     uint64_t current_thread_id;                 /* %gs:0x0048 */
  70     uint64_t active_rpc_handle;                 /* %gs:0x0050 */
  71     uint64_t thread_local_storage;              /* %gs:0x0058 */
  72     uint64_t process_environment_block;         /* %gs:0x0060 */
  73     uint64_t last_error_number;                 /* %gs:0x0068 */
  74   }
  75 thread_information_64;
  76
  77
  78 static const char* TIB_NAME[] =
  79   {
  80     " current_seh                 ",    /* %fs:0x0000 */
  81     " current_top_of_stack        ",    /* %fs:0x0004 */
  82     " current_bottom_of_stack     ",    /* %fs:0x0008 */
  83     " sub_system_tib              ",    /* %fs:0x000c */
  84     " fiber_data                  ",    /* %fs:0x0010 */
  85     " arbitrary_data_slot         ",    /* %fs:0x0014 */
  86     " linear_address_tib          ",    /* %fs:0x0018 */
  87     " environment_pointer         ",    /* %fs:0x001c */
  88     " process_id                  ",    /* %fs:0x0020 */
  89     " current_thread_id           ",    /* %fs:0x0024 */
  90     " active_rpc_handle           ",    /* %fs:0x0028 */
  91     " thread_local_storage        ",    /* %fs:0x002c */
  92     " process_environment_block   ",    /* %fs:0x0030 */
  93     " last_error_number           "     /* %fs:0x0034 */
  94   };
  95
  96 static const int MAX_TIB32 =
  97   sizeof (thread_information_32) / sizeof (uint32_t);
  98 static const int MAX_TIB64 =
  99   sizeof (thread_information_64) / sizeof (uint64_t);
 100 static const int FULL_TIB_SIZE = 0x1000;
 101
 102 static int maint_display_all_tib = 0;
 103
 104 /* Define Thread Local Base pointer type.  */
 105
 106 static struct type *
 107 windows_get_tlb_type (struct gdbarch *gdbarch)
 108 {
 109   static struct gdbarch *last_gdbarch = NULL;
 110   static struct type *last_tlb_type = NULL;
 111   struct type *dword_ptr_type, *dword32_type, *void_ptr_type;
 112   struct type *peb_ldr_type, *peb_ldr_ptr_type;
 113   struct type *peb_type, *peb_ptr_type, *list_type, *list_ptr_type;
 114   struct type *module_list_ptr_type;
 115   struct type *tib_type, *seh_type, *tib_ptr_type, *seh_ptr_type;
 116
 117   /* Do not rebuild type if same gdbarch as last time.  */
 118   if (last_tlb_type && last_gdbarch == gdbarch)
 119     return last_tlb_type;
 120
 121   dword_ptr_type = arch_integer_type (gdbarch, gdbarch_ptr_bit (gdbarch),
 122                                  1, "DWORD_PTR");
 123   dword32_type = arch_integer_type (gdbarch, 32,
 124                                  1, "DWORD32");
 125   void_ptr_type = lookup_pointer_type (builtin_type (gdbarch)->builtin_void);
 126
 127   /* list entry */
 128
 129   list_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 130   TYPE_NAME (list_type) = xstrdup ("list");
 131
 132   list_ptr_type = arch_type (gdbarch, TYPE_CODE_PTR,
 133                             TYPE_LENGTH (void_ptr_type), NULL);
 134
 135   module_list_ptr_type = void_ptr_type;
 136
 137   append_composite_type_field (list_type, "forward_list",
 138                                module_list_ptr_type);
 139   append_composite_type_field (list_type, "backward_list",
 140                                module_list_ptr_type);
 141
 142   /* Structured Exception Handler */
 143
 144   seh_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 145   TYPE_NAME (seh_type) = xstrdup ("seh");
 146
 147   seh_ptr_type = arch_type (gdbarch, TYPE_CODE_PTR,
 148                             TYPE_LENGTH (void_ptr_type), NULL);
 149   TYPE_TARGET_TYPE (seh_ptr_type) = seh_type;
 150
 151   append_composite_type_field (seh_type, "next_seh", seh_ptr_type);
 152   append_composite_type_field (seh_type, "handler",
 153                                builtin_type (gdbarch)->builtin_func_ptr);
 154
 155   /* struct _PEB_LDR_DATA */
 156   peb_ldr_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 157   TYPE_NAME (peb_ldr_type) = xstrdup ("peb_ldr_data");
 158
 159   append_composite_type_field (peb_ldr_type, "length", dword32_type);
 160   append_composite_type_field (peb_ldr_type, "initialized", dword32_type);
 161   append_composite_type_field (peb_ldr_type, "ss_handle", void_ptr_type);
 162   append_composite_type_field (peb_ldr_type, "in_load_order", list_type);
 163   append_composite_type_field (peb_ldr_type, "in_memory_order", list_type);
 164   append_composite_type_field (peb_ldr_type, "in_init_order", list_type);
 165   append_composite_type_field (peb_ldr_type, "entry_in_progress",
 166                                void_ptr_type);
 167   peb_ldr_ptr_type = arch_type (gdbarch, TYPE_CODE_PTR,
 168                             TYPE_LENGTH (void_ptr_type), NULL);
 169   TYPE_TARGET_TYPE (peb_ldr_ptr_type) = peb_ldr_type;
 170
 171
 172   /* struct process environment block */
 173   peb_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 174   TYPE_NAME (peb_type) = xstrdup ("peb");
 175
 176   /* First bytes contain several flags.  */
 177   append_composite_type_field (peb_type, "flags", dword_ptr_type);
 178   append_composite_type_field (peb_type, "mutant", void_ptr_type);
 179   append_composite_type_field (peb_type, "image_base_address", void_ptr_type);
 180   append_composite_type_field (peb_type, "ldr", peb_ldr_ptr_type);
 181   append_composite_type_field (peb_type, "process_parameters", void_ptr_type);
 182   append_composite_type_field (peb_type, "sub_system_data", void_ptr_type);
 183   append_composite_type_field (peb_type, "process_heap", void_ptr_type);
 184   append_composite_type_field (peb_type, "fast_peb_lock", void_ptr_type);
 185   peb_ptr_type = arch_type (gdbarch, TYPE_CODE_PTR,
 186                             TYPE_LENGTH (void_ptr_type), NULL);
 187   TYPE_TARGET_TYPE (peb_ptr_type) = peb_type;
 188
 189
 190   /* struct thread information block */
 191   tib_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 192   TYPE_NAME (tib_type) = xstrdup ("tib");
 193
 194   /* uint32_t current_seh;                      %fs:0x0000 */
 195   append_composite_type_field (tib_type, "current_seh", seh_ptr_type);
 196   /* uint32_t current_top_of_stack;             %fs:0x0004 */
 197   append_composite_type_field (tib_type, "current_top_of_stack",
 198                                void_ptr_type);
 199   /* uint32_t current_bottom_of_stack;          %fs:0x0008 */
 200   append_composite_type_field (tib_type, "current_bottom_of_stack",
 201                                void_ptr_type);
 202   /* uint32_t sub_system_tib;                   %fs:0x000c */
 203   append_composite_type_field (tib_type, "sub_system_tib", void_ptr_type);
 204
 205   /* uint32_t fiber_data;                       %fs:0x0010 */
 206   append_composite_type_field (tib_type, "fiber_data", void_ptr_type);
 207   /* uint32_t arbitrary_data_slot;              %fs:0x0014 */
 208   append_composite_type_field (tib_type, "arbitrary_data_slot", void_ptr_type);
 209   /* uint32_t linear_address_tib;               %fs:0x0018 */
 210   append_composite_type_field (tib_type, "linear_address_tib", void_ptr_type);
 211   /* uint32_t environment_pointer;              %fs:0x001c */
 212   append_composite_type_field (tib_type, "environment_pointer", void_ptr_type);
 213   /* uint32_t process_id;                       %fs:0x0020 */
 214   append_composite_type_field (tib_type, "process_id", dword_ptr_type);
 215   /* uint32_t current_thread_id;                %fs:0x0024 */
 216   append_composite_type_field (tib_type, "thread_id", dword_ptr_type);
 217   /* uint32_t active_rpc_handle;                %fs:0x0028 */
 218   append_composite_type_field (tib_type, "active_rpc_handle", dword_ptr_type);
 219   /* uint32_t thread_local_storage;             %fs:0x002c */
 220   append_composite_type_field (tib_type, "thread_local_storage",
 221                                void_ptr_type);
 222   /* uint32_t process_environment_block;        %fs:0x0030 */
 223   append_composite_type_field (tib_type, "process_environment_block",
 224                                peb_ptr_type);
 225   /* uint32_t last_error_number;                %fs:0x0034 */
 226   append_composite_type_field (tib_type, "last_error_number", dword_ptr_type);
 227
 228   tib_ptr_type = arch_type (gdbarch, TYPE_CODE_PTR,
 229                             TYPE_LENGTH (void_ptr_type), NULL);
 230   TYPE_TARGET_TYPE (tib_ptr_type) = tib_type;
 231
 232   last_tlb_type = tib_ptr_type;
 233   last_gdbarch = gdbarch;
 234
 235   return tib_ptr_type;
 236 }
 237
 238 /* The $_tlb convenience variable is a bit special.  We don't know
 239    for sure the type of the value until we actually have a chance to
 240    fetch the data.  The type can change depending on gdbarch, so it is
 241    also dependent on which thread you have selected.  */
 242
 243 /* This function implements the lval_computed support for reading a
 244    $_tlb value.  */
 245
 246 static void
 247 tlb_value_read (struct value *val)
 248 {
 249   CORE_ADDR tlb;
 250   struct type *type = check_typedef (value_type (val));
 251
 252   if (!target_get_tib_address (inferior_ptid, &tlb))
 253     error (_("Unable to read tlb"));
 254   store_typed_address (value_contents_raw (val), type, tlb);
 255 }
 256
 257 /* This function implements the lval_computed support for writing a
 258    $_tlb value.  */
 259
 260 static void
 261 tlb_value_write (struct value *v, struct value *fromval)
 262 {
 263   error (_("Impossible to change the Thread Local Base"));
 264 }
 265
 266 static const struct lval_funcs tlb_value_funcs =
 267   {
 268     tlb_value_read,
 269     tlb_value_write
 270   };
 271
 272
 273 /* Return a new value with the correct type for the tlb object of
 274    the current thread using architecture GDBARCH.  Return a void value
 275    if there's no object available.  */
 276
 277 static struct value *
 278 tlb_make_value (struct gdbarch *gdbarch, struct internalvar *var, void *ignore)
 279 {
 280   if (target_has_stack && !ptid_equal (inferior_ptid, null_ptid))
 281     {
 282       struct type *type = windows_get_tlb_type (gdbarch);
 283       return allocate_computed_value (type, &tlb_value_funcs, NULL);
 284     }
 285
 286   return allocate_value (builtin_type (gdbarch)->builtin_void);
 287 }
 288
 289
 290 /* Display thread information block of a given thread.  */
 291
 292 static int
 293 display_one_tib (ptid_t ptid)
 294 {
 295   gdb_byte *tib = NULL;
 296   gdb_byte *index;
 297   CORE_ADDR thread_local_base;
 298   ULONGEST i, val, max, max_name, size, tib_size;
 299   ULONGEST sizeof_ptr = gdbarch_ptr_bit (target_gdbarch ());
 300   enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
 301
 302   if (sizeof_ptr == 64)
 303     {
 304       size = sizeof (uint64_t);
 305       tib_size = sizeof (thread_information_64);
 306       max = MAX_TIB64;
 307     }
 308   else
 309     {
 310       size = sizeof (uint32_t);
 311       tib_size = sizeof (thread_information_32);
 312       max = MAX_TIB32;
 313     }
 314
 315   max_name = max;
 316
 317   if (maint_display_all_tib)
 318     {
 319       tib_size = FULL_TIB_SIZE;
 320       max = tib_size / size;
 321     }
 322
 323   tib = alloca (tib_size);
 324
 325   if (target_get_tib_address (ptid, &thread_local_base) == 0)
 326     {
 327       printf_filtered (_("Unable to get thread local base for %s\n"),
 328         target_pid_to_str (ptid));
 329       return -1;
 330     }
 331
 332   if (target_read (&current_target, TARGET_OBJECT_MEMORY,
 333                    NULL, tib, thread_local_base, tib_size) != tib_size)
 334     {
 335       printf_filtered (_("Unable to read thread information "
 336                          "block for %s at address %s\n"),
 337         target_pid_to_str (ptid),
 338         paddress (target_gdbarch (), thread_local_base));
 339       return -1;
 340     }
 341
 342   printf_filtered (_("Thread Information Block %s at %s\n"),
 343                    target_pid_to_str (ptid),
 344                    paddress (target_gdbarch (), thread_local_base));
 345
 346   index = (gdb_byte *) tib;
 347
 348   /* All fields have the size of a pointer, this allows to iterate
 349      using the same for loop for both layouts.  */
 350   for (i = 0; i < max; i++)
 351     {
 352       val = extract_unsigned_integer (index, size, byte_order);
 353       if (i < max_name)
 354         printf_filtered (_("%s is 0x%s\n"), TIB_NAME[i], phex (val, size));
 355       else if (val != 0)
 356         printf_filtered (_("TIB[0x%s] is 0x%s\n"), phex (i * size, 2),
 357                          phex (val, size));
 358       index += size;
 359     }
 360   return 1;
 361 }
 362
 363 /* Display thread information block of a thread specified by ARGS.
 364    If ARGS is empty, display thread information block of current_thread
 365    if current_thread is non NULL.
 366    Otherwise ARGS is parsed and converted to a integer that should
 367    be the windows ThreadID (not the internal GDB thread ID).  */
 368
 369 static void
 370 display_tib (char * args, int from_tty)
 371 {
 372   if (args)
 373     {
 374       struct thread_info *tp;
 375       int gdb_id = value_as_long (parse_and_eval (args));
 376
 377       tp = find_thread_id (gdb_id);
 378
 379       if (!tp)
 380         error (_("Thread ID %d not known."), gdb_id);
 381
 382       if (!target_thread_alive (tp->ptid))
 383         error (_("Thread ID %d has terminated."), gdb_id);
 384
 385       display_one_tib (tp->ptid);
 386     }
 387   else if (!ptid_equal (inferior_ptid, null_ptid))
 388     display_one_tib (inferior_ptid);
 389 }
 390
 391 void
 392 windows_xfer_shared_library (const char* so_name, CORE_ADDR load_addr,
 393                              struct gdbarch *gdbarch, struct obstack *obstack)
 394 {
 395   char *p;
 396   struct bfd * dll;
 397   CORE_ADDR text_offset;
 398
 399   obstack_grow_str (obstack, "<library name=\"");
 400   p = xml_escape_text (so_name);
 401   obstack_grow_str (obstack, p);
 402   xfree (p);
 403   obstack_grow_str (obstack, "\"><segment address=\"");
 404   dll = gdb_bfd_open_maybe_remote (so_name);
 405   /* The following calls are OK even if dll is NULL.
 406      The default value 0x1000 is returned by pe_text_section_offset
 407      in that case.  */
 408   text_offset = pe_text_section_offset (dll);
 409   gdb_bfd_unref (dll);
 410   obstack_grow_str (obstack, paddress (gdbarch, load_addr + text_offset));
 411   obstack_grow_str (obstack, "\"/></library>");
 412 }
 413
 414 /* Implement the "iterate_over_objfiles_in_search_order" gdbarch
 415    method.  It searches all objfiles, starting with CURRENT_OBJFILE
 416    first (if not NULL).
 417
 418    On Windows, the system behaves a little differently when two
 419    objfiles each define a global symbol using the same name, compared
 420    to other platforms such as GNU/Linux for instance.  On GNU/Linux,
 421    all instances of the symbol effectively get merged into a single
 422    one, but on Windows, they remain distinct.
 423
 424    As a result, it usually makes sense to start global symbol searches
 425    with the current objfile before expanding it to all other objfiles.
 426    This helps for instance when a user debugs some code in a DLL that
 427    refers to a global variable defined inside that DLL.  When trying
 428    to print the value of that global variable, it would be unhelpful
 429    to print the value of another global variable defined with the same
 430    name, but in a different DLL.  */
 431
 432 static void
 433 windows_iterate_over_objfiles_in_search_order
 434   (struct gdbarch *gdbarch,
 435    iterate_over_objfiles_in_search_order_cb_ftype *cb,
 436    void *cb_data, struct objfile *current_objfile)
 437 {
 438   int stop;
 439   struct objfile *objfile;
 440
 441   if (current_objfile)
 442     {
 443       stop = cb (current_objfile, cb_data);
 444       if (stop)
 445         return;
 446     }
 447
 448   ALL_OBJFILES (objfile)
 449     {
 450       if (objfile != current_objfile)
 451         {
 452           stop = cb (objfile, cb_data);
 453           if (stop)
 454             return;
 455         }
 456     }
 457 }
 458
 459 static void
 460 show_maint_show_all_tib (struct ui_file *file, int from_tty,
 461                 struct cmd_list_element *c, const char *value)
 462 {
 463   fprintf_filtered (file, _("Show all non-zero elements of "
 464                             "Thread Information Block is %s.\n"), value);
 465 }
 466
 467 static void
 468 info_w32_command (char *args, int from_tty)
 469 {
 470   help_list (info_w32_cmdlist, "info w32 ", class_info, gdb_stdout);
 471 }
 472
 473 static int w32_prefix_command_valid = 0;
 474 void
 475 init_w32_command_list (void)
 476 {
 477   if (!w32_prefix_command_valid)
 478     {
 479       add_prefix_cmd ("w32", class_info, info_w32_command,
 480                       _("Print information specific to Win32 debugging."),
 481                       &info_w32_cmdlist, "info w32 ", 0, &infolist);
 482       w32_prefix_command_valid = 1;
 483     }
 484 }
 485
 486 /* To be called from the various GDB_OSABI_CYGWIN handlers for the
 487    various Windows architectures and machine types.  */
 488
 489 void
 490 windows_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 491 {
 492   /* Canonical paths on this target look like
 493      `c:\Program Files\Foo App\mydll.dll', for example.  */
 494   set_gdbarch_has_dos_based_file_system (gdbarch, 1);
 495
 496   set_gdbarch_iterate_over_objfiles_in_search_order
 497     (gdbarch, windows_iterate_over_objfiles_in_search_order);
 498
 499   set_solib_ops (gdbarch, &solib_target_so_ops);
 500 }
 501
 502 /* Provide a prototype to silence -Wmissing-prototypes.  */
 503 extern initialize_file_ftype _initialize_windows_tdep;
 504
 505 /* Implementation of `tlb' variable.  */
 506
 507 static const struct internalvar_funcs tlb_funcs =
 508 {
 509   tlb_make_value,
 510   NULL,
 511   NULL
 512 };
 513
 514 void
 515 _initialize_windows_tdep (void)
 516 {
 517   init_w32_command_list ();
 518   add_cmd ("thread-information-block", class_info, display_tib,
 519            _("Display thread information block."),
 520            &info_w32_cmdlist);
 521   add_alias_cmd ("tib", "thread-information-block", class_info, 1,
 522                  &info_w32_cmdlist);
 523
 524   add_setshow_boolean_cmd ("show-all-tib", class_maintenance,
 525                            &maint_display_all_tib, _("\
 526 Set whether to display all non-zero fields of thread information block."), _("\
 527 Show whether to display all non-zero fields of thread information block."), _("\
 528 Use \"on\" to enable, \"off\" to disable.\n\
 529 If enabled, all non-zero fields of thread information block are displayed,\n\
 530 even if their meaning is unknown."),
 531                            NULL,
 532                            show_maint_show_all_tib,
 533                            &maintenance_set_cmdlist,
 534                            &maintenance_show_cmdlist);
 535
 536   /* Explicitly create without lookup, since that tries to create a
 537      value with a void typed value, and when we get here, gdbarch
 538      isn't initialized yet.  At this point, we're quite sure there
 539      isn't another convenience variable of the same name.  */
 540   create_internalvar_type_lazy ("_tlb", &tlb_funcs, NULL);
 541 }