gdb/windows-tdep.c

   1 /* Copyright (C) 2008-2020 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 #include "gdbcore.h"
  37 #include "coff/internal.h"
  38 #include "libcoff.h"
  39 #include "solist.h"
  40
  41 #define CYGWIN_DLL_NAME "cygwin1.dll"
  42
  43 /* Windows signal numbers differ between MinGW flavors and between
  44    those and Cygwin.  The below enumerations were gleaned from the
  45    respective headers.  */
  46
  47 /* Signal numbers for the various MinGW flavors.  The ones marked with
  48    MinGW-w64 are defined by MinGW-w64, not by mingw.org's MinGW.  */
  49
  50 enum
  51 {
  52   WINDOWS_SIGHUP = 1,   /* MinGW-w64 */
  53   WINDOWS_SIGINT = 2,
  54   WINDOWS_SIGQUIT = 3,  /* MinGW-w64 */
  55   WINDOWS_SIGILL = 4,
  56   WINDOWS_SIGTRAP = 5,  /* MinGW-w64 */
  57   WINDOWS_SIGIOT = 6,   /* MinGW-w64 */
  58   WINDOWS_SIGEMT = 7,   /* MinGW-w64 */
  59   WINDOWS_SIGFPE = 8,
  60   WINDOWS_SIGKILL = 9,  /* MinGW-w64 */
  61   WINDOWS_SIGBUS = 10,  /* MinGW-w64 */
  62   WINDOWS_SIGSEGV = 11,
  63   WINDOWS_SIGSYS = 12,  /* MinGW-w64 */
  64   WINDOWS_SIGPIPE = 13, /* MinGW-w64 */
  65   WINDOWS_SIGALRM = 14, /* MinGW-w64 */
  66   WINDOWS_SIGTERM = 15,
  67   WINDOWS_SIGBREAK = 21,
  68   WINDOWS_SIGABRT = 22,
  69 };
  70
  71 /* Signal numbers for Cygwin.  */
  72
  73 enum
  74 {
  75   CYGWIN_SIGHUP = 1,
  76   CYGWIN_SIGINT = 2,
  77   CYGWIN_SIGQUIT = 3,
  78   CYGWIN_SIGILL = 4,
  79   CYGWIN_SIGTRAP = 5,
  80   CYGWIN_SIGABRT = 6,
  81   CYGWIN_SIGEMT = 7,
  82   CYGWIN_SIGFPE = 8,
  83   CYGWIN_SIGKILL = 9,
  84   CYGWIN_SIGBUS = 10,
  85   CYGWIN_SIGSEGV = 11,
  86   CYGWIN_SIGSYS = 12,
  87   CYGWIN_SIGPIPE = 13,
  88   CYGWIN_SIGALRM = 14,
  89   CYGWIN_SIGTERM = 15,
  90   CYGWIN_SIGURG = 16,
  91   CYGWIN_SIGSTOP = 17,
  92   CYGWIN_SIGTSTP = 18,
  93   CYGWIN_SIGCONT = 19,
  94   CYGWIN_SIGCHLD = 20,
  95   CYGWIN_SIGTTIN = 21,
  96   CYGWIN_SIGTTOU = 22,
  97   CYGWIN_SIGIO = 23,
  98   CYGWIN_SIGXCPU = 24,
  99   CYGWIN_SIGXFSZ = 25,
 100   CYGWIN_SIGVTALRM = 26,
 101   CYGWIN_SIGPROF = 27,
 102   CYGWIN_SIGWINCH = 28,
 103   CYGWIN_SIGLOST = 29,
 104   CYGWIN_SIGUSR1 = 30,
 105   CYGWIN_SIGUSR2 = 31,
 106 };
 107
 108 struct cmd_list_element *info_w32_cmdlist;
 109
 110 typedef struct thread_information_block_32
 111   {
 112     uint32_t current_seh;                       /* %fs:0x0000 */
 113     uint32_t current_top_of_stack;              /* %fs:0x0004 */
 114     uint32_t current_bottom_of_stack;           /* %fs:0x0008 */
 115     uint32_t sub_system_tib;                    /* %fs:0x000c */
 116     uint32_t fiber_data;                        /* %fs:0x0010 */
 117     uint32_t arbitrary_data_slot;               /* %fs:0x0014 */
 118     uint32_t linear_address_tib;                /* %fs:0x0018 */
 119     uint32_t environment_pointer;               /* %fs:0x001c */
 120     uint32_t process_id;                        /* %fs:0x0020 */
 121     uint32_t current_thread_id;                 /* %fs:0x0024 */
 122     uint32_t active_rpc_handle;                 /* %fs:0x0028 */
 123     uint32_t thread_local_storage;              /* %fs:0x002c */
 124     uint32_t process_environment_block;         /* %fs:0x0030 */
 125     uint32_t last_error_number;                 /* %fs:0x0034 */
 126   }
 127 thread_information_32;
 128
 129 typedef struct thread_information_block_64
 130   {
 131     uint64_t current_seh;                       /* %gs:0x0000 */
 132     uint64_t current_top_of_stack;              /* %gs:0x0008 */
 133     uint64_t current_bottom_of_stack;           /* %gs:0x0010 */
 134     uint64_t sub_system_tib;                    /* %gs:0x0018 */
 135     uint64_t fiber_data;                        /* %gs:0x0020 */
 136     uint64_t arbitrary_data_slot;               /* %gs:0x0028 */
 137     uint64_t linear_address_tib;                /* %gs:0x0030 */
 138     uint64_t environment_pointer;               /* %gs:0x0038 */
 139     uint64_t process_id;                        /* %gs:0x0040 */
 140     uint64_t current_thread_id;                 /* %gs:0x0048 */
 141     uint64_t active_rpc_handle;                 /* %gs:0x0050 */
 142     uint64_t thread_local_storage;              /* %gs:0x0058 */
 143     uint64_t process_environment_block;         /* %gs:0x0060 */
 144     uint64_t last_error_number;                 /* %gs:0x0068 */
 145   }
 146 thread_information_64;
 147
 148
 149 static const char* TIB_NAME[] =
 150   {
 151     " current_seh                 ",    /* %fs:0x0000 */
 152     " current_top_of_stack        ",    /* %fs:0x0004 */
 153     " current_bottom_of_stack     ",    /* %fs:0x0008 */
 154     " sub_system_tib              ",    /* %fs:0x000c */
 155     " fiber_data                  ",    /* %fs:0x0010 */
 156     " arbitrary_data_slot         ",    /* %fs:0x0014 */
 157     " linear_address_tib          ",    /* %fs:0x0018 */
 158     " environment_pointer         ",    /* %fs:0x001c */
 159     " process_id                  ",    /* %fs:0x0020 */
 160     " current_thread_id           ",    /* %fs:0x0024 */
 161     " active_rpc_handle           ",    /* %fs:0x0028 */
 162     " thread_local_storage        ",    /* %fs:0x002c */
 163     " process_environment_block   ",    /* %fs:0x0030 */
 164     " last_error_number           "     /* %fs:0x0034 */
 165   };
 166
 167 static const int MAX_TIB32 =
 168   sizeof (thread_information_32) / sizeof (uint32_t);
 169 static const int MAX_TIB64 =
 170   sizeof (thread_information_64) / sizeof (uint64_t);
 171 static const int FULL_TIB_SIZE = 0x1000;
 172
 173 static bool maint_display_all_tib = false;
 174
 175 static struct gdbarch_data *windows_gdbarch_data_handle;
 176
 177 struct windows_gdbarch_data
 178 {
 179   struct type *siginfo_type;
 180   struct type *tib_ptr_type; /* Type of thread information block */
 181 };
 182
 183 /* Allocate windows_gdbarch_data for an arch.  */
 184
 185 static void *
 186 init_windows_gdbarch_data (struct gdbarch *gdbarch)
 187 {
 188   return GDBARCH_OBSTACK_ZALLOC (gdbarch, struct windows_gdbarch_data);
 189 }
 190
 191 /* Get windows_gdbarch_data of an arch.  */
 192
 193 static struct windows_gdbarch_data *
 194 get_windows_gdbarch_data (struct gdbarch *gdbarch)
 195 {
 196   return ((struct windows_gdbarch_data *)
 197           gdbarch_data (gdbarch, windows_gdbarch_data_handle));
 198 }
 199
 200 /* Define Thread Local Base pointer type.  */
 201
 202 static struct type *
 203 windows_get_tlb_type (struct gdbarch *gdbarch)
 204 {
 205   struct type *dword_ptr_type, *dword32_type, *void_ptr_type;
 206   struct type *peb_ldr_type, *peb_ldr_ptr_type;
 207   struct type *peb_type, *peb_ptr_type, *list_type;
 208   struct type *module_list_ptr_type;
 209   struct type *tib_type, *seh_type, *tib_ptr_type, *seh_ptr_type;
 210   struct type *word_type, *wchar_type, *wchar_ptr_type;
 211   struct type *uni_str_type, *rupp_type, *rupp_ptr_type;
 212
 213   windows_gdbarch_data *windows_gdbarch_data
 214     = get_windows_gdbarch_data (gdbarch);
 215   if (windows_gdbarch_data->tib_ptr_type != nullptr)
 216     return windows_gdbarch_data->tib_ptr_type;
 217
 218   dword_ptr_type = arch_integer_type (gdbarch, gdbarch_ptr_bit (gdbarch),
 219                                  1, "DWORD_PTR");
 220   dword32_type = arch_integer_type (gdbarch, 32,
 221                                  1, "DWORD32");
 222   word_type = arch_integer_type (gdbarch, 16,
 223                                  1, "WORD");
 224   wchar_type = arch_integer_type (gdbarch, 16,
 225                                   1, "wchar_t");
 226   void_ptr_type = lookup_pointer_type (builtin_type (gdbarch)->builtin_void);
 227   wchar_ptr_type = arch_pointer_type (gdbarch, gdbarch_ptr_bit (gdbarch),
 228                                       NULL, wchar_type);
 229
 230   /* list entry */
 231
 232   list_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 233   TYPE_NAME (list_type) = xstrdup ("list");
 234
 235   module_list_ptr_type = void_ptr_type;
 236
 237   append_composite_type_field (list_type, "forward_list",
 238                                module_list_ptr_type);
 239   append_composite_type_field (list_type, "backward_list",
 240                                module_list_ptr_type);
 241
 242   /* Structured Exception Handler */
 243
 244   seh_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 245   TYPE_NAME (seh_type) = xstrdup ("seh");
 246
 247   seh_ptr_type = arch_type (gdbarch, TYPE_CODE_PTR,
 248                             TYPE_LENGTH (void_ptr_type) * TARGET_CHAR_BIT,
 249                             NULL);
 250   TYPE_TARGET_TYPE (seh_ptr_type) = seh_type;
 251
 252   append_composite_type_field (seh_type, "next_seh", seh_ptr_type);
 253   append_composite_type_field (seh_type, "handler",
 254                                builtin_type (gdbarch)->builtin_func_ptr);
 255
 256   /* struct _PEB_LDR_DATA */
 257   peb_ldr_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 258   TYPE_NAME (peb_ldr_type) = xstrdup ("peb_ldr_data");
 259
 260   append_composite_type_field (peb_ldr_type, "length", dword32_type);
 261   append_composite_type_field (peb_ldr_type, "initialized", dword32_type);
 262   append_composite_type_field (peb_ldr_type, "ss_handle", void_ptr_type);
 263   append_composite_type_field (peb_ldr_type, "in_load_order", list_type);
 264   append_composite_type_field (peb_ldr_type, "in_memory_order", list_type);
 265   append_composite_type_field (peb_ldr_type, "in_init_order", list_type);
 266   append_composite_type_field (peb_ldr_type, "entry_in_progress",
 267                                void_ptr_type);
 268   peb_ldr_ptr_type = arch_type (gdbarch, TYPE_CODE_PTR,
 269                                 TYPE_LENGTH (void_ptr_type) * TARGET_CHAR_BIT,
 270                                 NULL);
 271   TYPE_TARGET_TYPE (peb_ldr_ptr_type) = peb_ldr_type;
 272
 273   /* struct UNICODE_STRING */
 274   uni_str_type = arch_composite_type (gdbarch, "unicode_string",
 275                                       TYPE_CODE_STRUCT);
 276
 277   append_composite_type_field (uni_str_type, "length", word_type);
 278   append_composite_type_field (uni_str_type, "maximum_length", word_type);
 279   append_composite_type_field_aligned (uni_str_type, "buffer",
 280                                        wchar_ptr_type,
 281                                        TYPE_LENGTH (wchar_ptr_type));
 282
 283   /* struct _RTL_USER_PROCESS_PARAMETERS */
 284   rupp_type = arch_composite_type (gdbarch, "rtl_user_process_parameters",
 285                                    TYPE_CODE_STRUCT);
 286
 287   append_composite_type_field (rupp_type, "maximum_length", dword32_type);
 288   append_composite_type_field (rupp_type, "length", dword32_type);
 289   append_composite_type_field (rupp_type, "flags", dword32_type);
 290   append_composite_type_field (rupp_type, "debug_flags", dword32_type);
 291   append_composite_type_field (rupp_type, "console_handle", void_ptr_type);
 292   append_composite_type_field (rupp_type, "console_flags", dword32_type);
 293   append_composite_type_field_aligned (rupp_type, "standard_input",
 294                                        void_ptr_type,
 295                                        TYPE_LENGTH (void_ptr_type));
 296   append_composite_type_field (rupp_type, "standard_output", void_ptr_type);
 297   append_composite_type_field (rupp_type, "standard_error", void_ptr_type);
 298   append_composite_type_field (rupp_type, "current_directory", uni_str_type);
 299   append_composite_type_field (rupp_type, "current_directory_handle",
 300                                void_ptr_type);
 301   append_composite_type_field (rupp_type, "dll_path", uni_str_type);
 302   append_composite_type_field (rupp_type, "image_path_name", uni_str_type);
 303   append_composite_type_field (rupp_type, "command_line", uni_str_type);
 304   append_composite_type_field (rupp_type, "environment", void_ptr_type);
 305   append_composite_type_field (rupp_type, "starting_x", dword32_type);
 306   append_composite_type_field (rupp_type, "starting_y", dword32_type);
 307   append_composite_type_field (rupp_type, "count_x", dword32_type);
 308   append_composite_type_field (rupp_type, "count_y", dword32_type);
 309   append_composite_type_field (rupp_type, "count_chars_x", dword32_type);
 310   append_composite_type_field (rupp_type, "count_chars_y", dword32_type);
 311   append_composite_type_field (rupp_type, "fill_attribute", dword32_type);
 312   append_composite_type_field (rupp_type, "window_flags", dword32_type);
 313   append_composite_type_field (rupp_type, "show_window_flags", dword32_type);
 314   append_composite_type_field_aligned (rupp_type, "window_title",
 315                                        uni_str_type,
 316                                        TYPE_LENGTH (void_ptr_type));
 317   append_composite_type_field (rupp_type, "desktop_info", uni_str_type);
 318   append_composite_type_field (rupp_type, "shell_info", uni_str_type);
 319   append_composite_type_field (rupp_type, "runtime_data", uni_str_type);
 320
 321   rupp_ptr_type = arch_pointer_type (gdbarch, gdbarch_ptr_bit (gdbarch),
 322                                      NULL, rupp_type);
 323
 324
 325   /* struct process environment block */
 326   peb_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 327   TYPE_NAME (peb_type) = xstrdup ("peb");
 328
 329   /* First bytes contain several flags.  */
 330   append_composite_type_field (peb_type, "flags", dword_ptr_type);
 331   append_composite_type_field (peb_type, "mutant", void_ptr_type);
 332   append_composite_type_field (peb_type, "image_base_address", void_ptr_type);
 333   append_composite_type_field (peb_type, "ldr", peb_ldr_ptr_type);
 334   append_composite_type_field (peb_type, "process_parameters", rupp_ptr_type);
 335   append_composite_type_field (peb_type, "sub_system_data", void_ptr_type);
 336   append_composite_type_field (peb_type, "process_heap", void_ptr_type);
 337   append_composite_type_field (peb_type, "fast_peb_lock", void_ptr_type);
 338   peb_ptr_type = arch_type (gdbarch, TYPE_CODE_PTR,
 339                             TYPE_LENGTH (void_ptr_type) * TARGET_CHAR_BIT,
 340                             NULL);
 341   TYPE_TARGET_TYPE (peb_ptr_type) = peb_type;
 342
 343
 344   /* struct thread information block */
 345   tib_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 346   TYPE_NAME (tib_type) = xstrdup ("tib");
 347
 348   /* uint32_t current_seh;                      %fs:0x0000 */
 349   append_composite_type_field (tib_type, "current_seh", seh_ptr_type);
 350   /* uint32_t current_top_of_stack;             %fs:0x0004 */
 351   append_composite_type_field (tib_type, "current_top_of_stack",
 352                                void_ptr_type);
 353   /* uint32_t current_bottom_of_stack;          %fs:0x0008 */
 354   append_composite_type_field (tib_type, "current_bottom_of_stack",
 355                                void_ptr_type);
 356   /* uint32_t sub_system_tib;                   %fs:0x000c */
 357   append_composite_type_field (tib_type, "sub_system_tib", void_ptr_type);
 358
 359   /* uint32_t fiber_data;                       %fs:0x0010 */
 360   append_composite_type_field (tib_type, "fiber_data", void_ptr_type);
 361   /* uint32_t arbitrary_data_slot;              %fs:0x0014 */
 362   append_composite_type_field (tib_type, "arbitrary_data_slot", void_ptr_type);
 363   /* uint32_t linear_address_tib;               %fs:0x0018 */
 364   append_composite_type_field (tib_type, "linear_address_tib", void_ptr_type);
 365   /* uint32_t environment_pointer;              %fs:0x001c */
 366   append_composite_type_field (tib_type, "environment_pointer", void_ptr_type);
 367   /* uint32_t process_id;                       %fs:0x0020 */
 368   append_composite_type_field (tib_type, "process_id", dword_ptr_type);
 369   /* uint32_t current_thread_id;                %fs:0x0024 */
 370   append_composite_type_field (tib_type, "thread_id", dword_ptr_type);
 371   /* uint32_t active_rpc_handle;                %fs:0x0028 */
 372   append_composite_type_field (tib_type, "active_rpc_handle", dword_ptr_type);
 373   /* uint32_t thread_local_storage;             %fs:0x002c */
 374   append_composite_type_field (tib_type, "thread_local_storage",
 375                                void_ptr_type);
 376   /* uint32_t process_environment_block;        %fs:0x0030 */
 377   append_composite_type_field (tib_type, "process_environment_block",
 378                                peb_ptr_type);
 379   /* uint32_t last_error_number;                %fs:0x0034 */
 380   append_composite_type_field (tib_type, "last_error_number", dword_ptr_type);
 381
 382   tib_ptr_type = arch_type (gdbarch, TYPE_CODE_PTR,
 383                             TYPE_LENGTH (void_ptr_type) * TARGET_CHAR_BIT,
 384                             NULL);
 385   TYPE_TARGET_TYPE (tib_ptr_type) = tib_type;
 386
 387   windows_gdbarch_data->tib_ptr_type = tib_ptr_type;
 388
 389   return tib_ptr_type;
 390 }
 391
 392 /* The $_tlb convenience variable is a bit special.  We don't know
 393    for sure the type of the value until we actually have a chance to
 394    fetch the data.  The type can change depending on gdbarch, so it is
 395    also dependent on which thread you have selected.  */
 396
 397 /* This function implements the lval_computed support for reading a
 398    $_tlb value.  */
 399
 400 static void
 401 tlb_value_read (struct value *val)
 402 {
 403   CORE_ADDR tlb;
 404   struct type *type = check_typedef (value_type (val));
 405
 406   if (!target_get_tib_address (inferior_ptid, &tlb))
 407     error (_("Unable to read tlb"));
 408   store_typed_address (value_contents_raw (val), type, tlb);
 409 }
 410
 411 /* This function implements the lval_computed support for writing a
 412    $_tlb value.  */
 413
 414 static void
 415 tlb_value_write (struct value *v, struct value *fromval)
 416 {
 417   error (_("Impossible to change the Thread Local Base"));
 418 }
 419
 420 static const struct lval_funcs tlb_value_funcs =
 421   {
 422     tlb_value_read,
 423     tlb_value_write
 424   };
 425
 426
 427 /* Return a new value with the correct type for the tlb object of
 428    the current thread using architecture GDBARCH.  Return a void value
 429    if there's no object available.  */
 430
 431 static struct value *
 432 tlb_make_value (struct gdbarch *gdbarch, struct internalvar *var, void *ignore)
 433 {
 434   if (target_has_stack && inferior_ptid != null_ptid)
 435     {
 436       struct type *type = windows_get_tlb_type (gdbarch);
 437       return allocate_computed_value (type, &tlb_value_funcs, NULL);
 438     }
 439
 440   return allocate_value (builtin_type (gdbarch)->builtin_void);
 441 }
 442
 443
 444 /* Display thread information block of a given thread.  */
 445
 446 static int
 447 display_one_tib (ptid_t ptid)
 448 {
 449   gdb_byte *tib = NULL;
 450   gdb_byte *index;
 451   CORE_ADDR thread_local_base;
 452   ULONGEST i, val, max, max_name, size, tib_size;
 453   ULONGEST sizeof_ptr = gdbarch_ptr_bit (target_gdbarch ());
 454   enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
 455
 456   if (sizeof_ptr == 64)
 457     {
 458       size = sizeof (uint64_t);
 459       tib_size = sizeof (thread_information_64);
 460       max = MAX_TIB64;
 461     }
 462   else
 463     {
 464       size = sizeof (uint32_t);
 465       tib_size = sizeof (thread_information_32);
 466       max = MAX_TIB32;
 467     }
 468
 469   max_name = max;
 470
 471   if (maint_display_all_tib)
 472     {
 473       tib_size = FULL_TIB_SIZE;
 474       max = tib_size / size;
 475     }
 476
 477   tib = (gdb_byte *) alloca (tib_size);
 478
 479   if (target_get_tib_address (ptid, &thread_local_base) == 0)
 480     {
 481       printf_filtered (_("Unable to get thread local base for %s\n"),
 482                        target_pid_to_str (ptid).c_str ());
 483       return -1;
 484     }
 485
 486   if (target_read (current_top_target (), TARGET_OBJECT_MEMORY,
 487                    NULL, tib, thread_local_base, tib_size) != tib_size)
 488     {
 489       printf_filtered (_("Unable to read thread information "
 490                          "block for %s at address %s\n"),
 491                        target_pid_to_str (ptid).c_str (),
 492                        paddress (target_gdbarch (), thread_local_base));
 493       return -1;
 494     }
 495
 496   printf_filtered (_("Thread Information Block %s at %s\n"),
 497                    target_pid_to_str (ptid).c_str (),
 498                    paddress (target_gdbarch (), thread_local_base));
 499
 500   index = (gdb_byte *) tib;
 501
 502   /* All fields have the size of a pointer, this allows to iterate
 503      using the same for loop for both layouts.  */
 504   for (i = 0; i < max; i++)
 505     {
 506       val = extract_unsigned_integer (index, size, byte_order);
 507       if (i < max_name)
 508         printf_filtered (_("%s is 0x%s\n"), TIB_NAME[i], phex (val, size));
 509       else if (val != 0)
 510         printf_filtered (_("TIB[0x%s] is 0x%s\n"), phex (i * size, 2),
 511                          phex (val, size));
 512       index += size;
 513     }
 514   return 1;
 515 }
 516
 517 /* Display thread information block of the current thread.  */
 518
 519 static void
 520 display_tib (const char * args, int from_tty)
 521 {
 522   if (inferior_ptid != null_ptid)
 523     display_one_tib (inferior_ptid);
 524 }
 525
 526 void
 527 windows_xfer_shared_library (const char* so_name, CORE_ADDR load_addr,
 528                              CORE_ADDR *text_offset_cached,
 529                              struct gdbarch *gdbarch, struct obstack *obstack)
 530 {
 531   CORE_ADDR text_offset = text_offset_cached ? *text_offset_cached : 0;
 532
 533   obstack_grow_str (obstack, "<library name=\"");
 534   std::string p = xml_escape_text (so_name);
 535   obstack_grow_str (obstack, p.c_str ());
 536   obstack_grow_str (obstack, "\"><segment address=\"");
 537
 538   if (!text_offset)
 539     {
 540       gdb_bfd_ref_ptr dll (gdb_bfd_open (so_name, gnutarget, -1));
 541       /* The following calls are OK even if dll is NULL.
 542          The default value 0x1000 is returned by pe_text_section_offset
 543          in that case.  */
 544       text_offset = pe_text_section_offset (dll.get ());
 545       if (text_offset_cached)
 546         *text_offset_cached = text_offset;
 547     }
 548
 549   obstack_grow_str (obstack, paddress (gdbarch, load_addr + text_offset));
 550   obstack_grow_str (obstack, "\"/></library>");
 551 }
 552
 553 /* Implement the "iterate_over_objfiles_in_search_order" gdbarch
 554    method.  It searches all objfiles, starting with CURRENT_OBJFILE
 555    first (if not NULL).
 556
 557    On Windows, the system behaves a little differently when two
 558    objfiles each define a global symbol using the same name, compared
 559    to other platforms such as GNU/Linux for instance.  On GNU/Linux,
 560    all instances of the symbol effectively get merged into a single
 561    one, but on Windows, they remain distinct.
 562
 563    As a result, it usually makes sense to start global symbol searches
 564    with the current objfile before expanding it to all other objfiles.
 565    This helps for instance when a user debugs some code in a DLL that
 566    refers to a global variable defined inside that DLL.  When trying
 567    to print the value of that global variable, it would be unhelpful
 568    to print the value of another global variable defined with the same
 569    name, but in a different DLL.  */
 570
 571 static void
 572 windows_iterate_over_objfiles_in_search_order
 573   (struct gdbarch *gdbarch,
 574    iterate_over_objfiles_in_search_order_cb_ftype *cb,
 575    void *cb_data, struct objfile *current_objfile)
 576 {
 577   int stop;
 578
 579   if (current_objfile)
 580     {
 581       stop = cb (current_objfile, cb_data);
 582       if (stop)
 583         return;
 584     }
 585
 586   for (objfile *objfile : current_program_space->objfiles ())
 587     {
 588       if (objfile != current_objfile)
 589         {
 590           stop = cb (objfile, cb_data);
 591           if (stop)
 592             return;
 593         }
 594     }
 595 }
 596
 597 static void
 598 show_maint_show_all_tib (struct ui_file *file, int from_tty,
 599                 struct cmd_list_element *c, const char *value)
 600 {
 601   fprintf_filtered (file, _("Show all non-zero elements of "
 602                             "Thread Information Block is %s.\n"), value);
 603 }
 604
 605
 606 static int w32_prefix_command_valid = 0;
 607 void
 608 init_w32_command_list (void)
 609 {
 610   if (!w32_prefix_command_valid)
 611     {
 612       add_basic_prefix_cmd
 613         ("w32", class_info,
 614          _("Print information specific to Win32 debugging."),
 615          &info_w32_cmdlist, "info w32 ", 0, &infolist);
 616       w32_prefix_command_valid = 1;
 617     }
 618 }
 619
 620 /* Implementation of `gdbarch_gdb_signal_to_target' for Windows.  */
 621
 622 static int
 623 windows_gdb_signal_to_target (struct gdbarch *gdbarch, enum gdb_signal signal)
 624 {
 625   switch (signal)
 626     {
 627     case GDB_SIGNAL_0:
 628       return 0;
 629     case GDB_SIGNAL_HUP:
 630       return WINDOWS_SIGHUP;
 631     case GDB_SIGNAL_INT:
 632       return WINDOWS_SIGINT;
 633     case GDB_SIGNAL_QUIT:
 634       return WINDOWS_SIGQUIT;
 635     case GDB_SIGNAL_ILL:
 636       return WINDOWS_SIGILL;
 637     case GDB_SIGNAL_TRAP:
 638       return WINDOWS_SIGTRAP;
 639     case GDB_SIGNAL_ABRT:
 640       return WINDOWS_SIGABRT;
 641     case GDB_SIGNAL_EMT:
 642       return WINDOWS_SIGEMT;
 643     case GDB_SIGNAL_FPE:
 644       return WINDOWS_SIGFPE;
 645     case GDB_SIGNAL_KILL:
 646       return WINDOWS_SIGKILL;
 647     case GDB_SIGNAL_BUS:
 648       return WINDOWS_SIGBUS;
 649     case GDB_SIGNAL_SEGV:
 650       return WINDOWS_SIGSEGV;
 651     case GDB_SIGNAL_SYS:
 652       return WINDOWS_SIGSYS;
 653     case GDB_SIGNAL_PIPE:
 654       return WINDOWS_SIGPIPE;
 655     case GDB_SIGNAL_ALRM:
 656       return WINDOWS_SIGALRM;
 657     case GDB_SIGNAL_TERM:
 658       return WINDOWS_SIGTERM;
 659     }
 660   return -1;
 661 }
 662
 663 /* Implementation of `gdbarch_gdb_signal_to_target' for Cygwin.  */
 664
 665 static int
 666 cygwin_gdb_signal_to_target (struct gdbarch *gdbarch, enum gdb_signal signal)
 667 {
 668   switch (signal)
 669     {
 670     case GDB_SIGNAL_0:
 671       return 0;
 672     case GDB_SIGNAL_HUP:
 673       return CYGWIN_SIGHUP;
 674     case GDB_SIGNAL_INT:
 675       return CYGWIN_SIGINT;
 676     case GDB_SIGNAL_QUIT:
 677       return CYGWIN_SIGQUIT;
 678     case GDB_SIGNAL_ILL:
 679       return CYGWIN_SIGILL;
 680     case GDB_SIGNAL_TRAP:
 681       return CYGWIN_SIGTRAP;
 682     case GDB_SIGNAL_ABRT:
 683       return CYGWIN_SIGABRT;
 684     case GDB_SIGNAL_EMT:
 685       return CYGWIN_SIGEMT;
 686     case GDB_SIGNAL_FPE:
 687       return CYGWIN_SIGFPE;
 688     case GDB_SIGNAL_KILL:
 689       return CYGWIN_SIGKILL;
 690     case GDB_SIGNAL_BUS:
 691       return CYGWIN_SIGBUS;
 692     case GDB_SIGNAL_SEGV:
 693       return CYGWIN_SIGSEGV;
 694     case GDB_SIGNAL_SYS:
 695       return CYGWIN_SIGSYS;
 696     case GDB_SIGNAL_PIPE:
 697       return CYGWIN_SIGPIPE;
 698     case GDB_SIGNAL_ALRM:
 699       return CYGWIN_SIGALRM;
 700     case GDB_SIGNAL_TERM:
 701       return CYGWIN_SIGTERM;
 702     case GDB_SIGNAL_URG:
 703       return CYGWIN_SIGURG;
 704     case GDB_SIGNAL_STOP:
 705       return CYGWIN_SIGSTOP;
 706     case GDB_SIGNAL_TSTP:
 707       return CYGWIN_SIGTSTP;
 708     case GDB_SIGNAL_CONT:
 709       return CYGWIN_SIGCONT;
 710     case GDB_SIGNAL_CHLD:
 711       return CYGWIN_SIGCHLD;
 712     case GDB_SIGNAL_TTIN:
 713       return CYGWIN_SIGTTIN;
 714     case GDB_SIGNAL_TTOU:
 715       return CYGWIN_SIGTTOU;
 716     case GDB_SIGNAL_IO:
 717       return CYGWIN_SIGIO;
 718     case GDB_SIGNAL_XCPU:
 719       return CYGWIN_SIGXCPU;
 720     case GDB_SIGNAL_XFSZ:
 721       return CYGWIN_SIGXFSZ;
 722     case GDB_SIGNAL_VTALRM:
 723       return CYGWIN_SIGVTALRM;
 724     case GDB_SIGNAL_PROF:
 725       return CYGWIN_SIGPROF;
 726     case GDB_SIGNAL_WINCH:
 727       return CYGWIN_SIGWINCH;
 728     case GDB_SIGNAL_PWR:
 729       return CYGWIN_SIGLOST;
 730     case GDB_SIGNAL_USR1:
 731       return CYGWIN_SIGUSR1;
 732     case GDB_SIGNAL_USR2:
 733       return CYGWIN_SIGUSR2;
 734     }
 735   return -1;
 736 }
 737
 738 struct enum_value_name
 739 {
 740   uint32_t value;
 741   const char *name;
 742 };
 743
 744 /* Allocate a TYPE_CODE_ENUM type structure with its named values.  */
 745
 746 static struct type *
 747 create_enum (struct gdbarch *gdbarch, int bit, const char *name,
 748              const struct enum_value_name *values, int count)
 749 {
 750   struct type *type;
 751   int i;
 752
 753   type = arch_type (gdbarch, TYPE_CODE_ENUM, bit, name);
 754   TYPE_NFIELDS (type) = count;
 755   TYPE_FIELDS (type) = (struct field *)
 756     TYPE_ZALLOC (type, sizeof (struct field) * count);
 757   TYPE_UNSIGNED (type) = 1;
 758
 759   for (i = 0; i < count; i++)
 760   {
 761     TYPE_FIELD_NAME (type, i) = values[i].name;
 762     SET_FIELD_ENUMVAL (TYPE_FIELD (type, i), values[i].value);
 763   }
 764
 765   return type;
 766 }
 767
 768 static const struct enum_value_name exception_values[] =
 769 {
 770   { 0x40000015, "FATAL_APP_EXIT" },
 771   { 0x40010005, "DBG_CONTROL_C" },
 772   { 0x40010008, "DBG_CONTROL_BREAK" },
 773   { 0x80000002, "DATATYPE_MISALIGNMENT" },
 774   { 0x80000003, "BREAKPOINT" },
 775   { 0x80000004, "SINGLE_STEP" },
 776   { 0xC0000005, "ACCESS_VIOLATION" },
 777   { 0xC0000006, "IN_PAGE_ERROR" },
 778   { 0xC000001D, "ILLEGAL_INSTRUCTION" },
 779   { 0xC0000025, "NONCONTINUABLE_EXCEPTION" },
 780   { 0xC0000026, "INVALID_DISPOSITION" },
 781   { 0xC000008C, "ARRAY_BOUNDS_EXCEEDED" },
 782   { 0xC000008D, "FLOAT_DENORMAL_OPERAND" },
 783   { 0xC000008E, "FLOAT_DIVIDE_BY_ZERO" },
 784   { 0xC000008F, "FLOAT_INEXACT_RESULT" },
 785   { 0xC0000090, "FLOAT_INVALID_OPERATION" },
 786   { 0xC0000091, "FLOAT_OVERFLOW" },
 787   { 0xC0000092, "FLOAT_STACK_CHECK" },
 788   { 0xC0000093, "FLOAT_UNDERFLOW" },
 789   { 0xC0000094, "INTEGER_DIVIDE_BY_ZERO" },
 790   { 0xC0000095, "INTEGER_OVERFLOW" },
 791   { 0xC0000096, "PRIV_INSTRUCTION" },
 792   { 0xC00000FD, "STACK_OVERFLOW" },
 793   { 0xC0000409, "FAST_FAIL" },
 794 };
 795
 796 static const struct enum_value_name violation_values[] =
 797 {
 798   { 0, "READ_ACCESS_VIOLATION" },
 799   { 1, "WRITE_ACCESS_VIOLATION" },
 800   { 8, "DATA_EXECUTION_PREVENTION_VIOLATION" },
 801 };
 802
 803 /* Implement the "get_siginfo_type" gdbarch method.  */
 804
 805 static struct type *
 806 windows_get_siginfo_type (struct gdbarch *gdbarch)
 807 {
 808   struct windows_gdbarch_data *windows_gdbarch_data;
 809   struct type *dword_type, *pvoid_type, *ulongptr_type;
 810   struct type *code_enum, *violation_enum;
 811   struct type *violation_type, *para_type, *siginfo_ptr_type, *siginfo_type;
 812
 813   windows_gdbarch_data = get_windows_gdbarch_data (gdbarch);
 814   if (windows_gdbarch_data->siginfo_type != NULL)
 815     return windows_gdbarch_data->siginfo_type;
 816
 817   dword_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch),
 818                                   1, "DWORD");
 819   pvoid_type = arch_pointer_type (gdbarch, gdbarch_ptr_bit (gdbarch), "PVOID",
 820                                   builtin_type (gdbarch)->builtin_void);
 821   ulongptr_type = arch_integer_type (gdbarch, gdbarch_ptr_bit (gdbarch),
 822                                      1, "ULONG_PTR");
 823
 824   /* ExceptionCode value names */
 825   code_enum = create_enum (gdbarch, gdbarch_int_bit (gdbarch),
 826                            "ExceptionCode", exception_values,
 827                            ARRAY_SIZE (exception_values));
 828
 829   /* ACCESS_VIOLATION type names */
 830   violation_enum = create_enum (gdbarch, gdbarch_ptr_bit (gdbarch),
 831                                 "ViolationType", violation_values,
 832                                 ARRAY_SIZE (violation_values));
 833
 834   /* ACCESS_VIOLATION information */
 835   violation_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 836   append_composite_type_field (violation_type, "Type", violation_enum);
 837   append_composite_type_field (violation_type, "Address", pvoid_type);
 838
 839   /* Unnamed union of the documented field ExceptionInformation,
 840      and the alternative AccessViolationInformation (which displays
 841      human-readable values for ExceptionCode ACCESS_VIOLATION).  */
 842   para_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION);
 843   append_composite_type_field (para_type, "ExceptionInformation",
 844                                lookup_array_range_type (ulongptr_type, 0, 14));
 845   append_composite_type_field (para_type, "AccessViolationInformation",
 846                                violation_type);
 847
 848   siginfo_type = arch_composite_type (gdbarch, "EXCEPTION_RECORD",
 849                                       TYPE_CODE_STRUCT);
 850   siginfo_ptr_type = arch_pointer_type (gdbarch, gdbarch_ptr_bit (gdbarch),
 851                                         NULL, siginfo_type);
 852
 853   /* ExceptionCode is documented as type DWORD, but here a helper
 854      enum type is used instead to display a human-readable value.  */
 855   append_composite_type_field (siginfo_type, "ExceptionCode", code_enum);
 856   append_composite_type_field (siginfo_type, "ExceptionFlags", dword_type);
 857   append_composite_type_field (siginfo_type, "ExceptionRecord",
 858                                siginfo_ptr_type);
 859   append_composite_type_field (siginfo_type, "ExceptionAddress",
 860                                pvoid_type);
 861   append_composite_type_field (siginfo_type, "NumberParameters", dword_type);
 862   /* The 64-bit variant needs some padding.  */
 863   append_composite_type_field_aligned (siginfo_type, "",
 864                                        para_type, TYPE_LENGTH (ulongptr_type));
 865
 866   windows_gdbarch_data->siginfo_type = siginfo_type;
 867
 868   return siginfo_type;
 869 }
 870
 871 /* Implement the "solib_create_inferior_hook" target_so_ops method.  */
 872
 873 static void
 874 windows_solib_create_inferior_hook (int from_tty)
 875 {
 876   CORE_ADDR exec_base = 0;
 877
 878   /* Find base address of main executable in
 879      TIB->process_environment_block->image_base_address.  */
 880   struct gdbarch *gdbarch = target_gdbarch ();
 881   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 882   int ptr_bytes;
 883   int peb_offset;  /* Offset of process_environment_block in TIB.  */
 884   int base_offset; /* Offset of image_base_address in PEB.  */
 885   if (gdbarch_ptr_bit (gdbarch) == 32)
 886     {
 887       ptr_bytes = 4;
 888       peb_offset = 48;
 889       base_offset = 8;
 890     }
 891   else
 892     {
 893       ptr_bytes = 8;
 894       peb_offset = 96;
 895       base_offset = 16;
 896     }
 897   CORE_ADDR tlb;
 898   gdb_byte buf[8];
 899   if (target_has_execution
 900       && target_get_tib_address (inferior_ptid, &tlb)
 901       && !target_read_memory (tlb + peb_offset, buf, ptr_bytes))
 902     {
 903       CORE_ADDR peb = extract_unsigned_integer (buf, ptr_bytes, byte_order);
 904       if (!target_read_memory (peb + base_offset, buf, ptr_bytes))
 905         exec_base = extract_unsigned_integer (buf, ptr_bytes, byte_order);
 906     }
 907
 908   /* Rebase executable if the base address changed because of ASLR.  */
 909   if (symfile_objfile != nullptr && exec_base != 0)
 910     {
 911       CORE_ADDR vmaddr = pe_data (exec_bfd)->pe_opthdr.ImageBase;
 912       if (vmaddr != exec_base)
 913         objfile_rebase (symfile_objfile, exec_base - vmaddr);
 914     }
 915 }
 916
 917 static struct target_so_ops windows_so_ops;
 918
 919 /* Common parts for gdbarch initialization for the Windows and Cygwin OS
 920    ABIs.  */
 921
 922 static void
 923 windows_init_abi_common (struct gdbarch_info info, struct gdbarch *gdbarch)
 924 {
 925   set_gdbarch_wchar_bit (gdbarch, 16);
 926   set_gdbarch_wchar_signed (gdbarch, 0);
 927
 928   /* Canonical paths on this target look like
 929      `c:\Program Files\Foo App\mydll.dll', for example.  */
 930   set_gdbarch_has_dos_based_file_system (gdbarch, 1);
 931
 932   set_gdbarch_iterate_over_objfiles_in_search_order
 933     (gdbarch, windows_iterate_over_objfiles_in_search_order);
 934
 935   windows_so_ops = solib_target_so_ops;
 936   windows_so_ops.solib_create_inferior_hook
 937     = windows_solib_create_inferior_hook;
 938   set_solib_ops (gdbarch, &windows_so_ops);
 939
 940   set_gdbarch_get_siginfo_type (gdbarch, windows_get_siginfo_type);
 941 }
 942
 943 /* See windows-tdep.h.  */
 944 void
 945 windows_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 946 {
 947   windows_init_abi_common (info, gdbarch);
 948   set_gdbarch_gdb_signal_to_target (gdbarch, windows_gdb_signal_to_target);
 949 }
 950
 951 /* See windows-tdep.h.  */
 952
 953 void
 954 cygwin_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 955 {
 956   windows_init_abi_common (info, gdbarch);
 957   set_gdbarch_gdb_signal_to_target (gdbarch, cygwin_gdb_signal_to_target);
 958 }
 959
 960 /* Implementation of `tlb' variable.  */
 961
 962 static const struct internalvar_funcs tlb_funcs =
 963 {
 964   tlb_make_value,
 965   NULL,
 966   NULL
 967 };
 968
 969 /* Layout of an element of a PE's Import Directory Table.  Based on:
 970
 971      https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#import-directory-table
 972  */
 973
 974 struct pe_import_directory_entry
 975 {
 976   uint32_t import_lookup_table_rva;
 977   uint32_t timestamp;
 978   uint32_t forwarder_chain;
 979   uint32_t name_rva;
 980   uint32_t import_address_table_rva;
 981 };
 982
 983 gdb_static_assert (sizeof (pe_import_directory_entry) == 20);
 984
 985 /* See windows-tdep.h.  */
 986
 987 bool
 988 is_linked_with_cygwin_dll (bfd *abfd)
 989 {
 990   /* The list of DLLs a PE is linked to is in the .idata section.  See:
 991
 992      https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#the-idata-section
 993    */
 994   asection *idata_section = bfd_get_section_by_name (abfd, ".idata");
 995   if (idata_section == nullptr)
 996     return false;
 997
 998   bfd_size_type idata_section_size = bfd_section_size (idata_section);
 999   internal_extra_pe_aouthdr *pe_extra = &pe_data (abfd)->pe_opthdr;
1000   bfd_vma import_table_va = pe_extra->DataDirectory[PE_IMPORT_TABLE].VirtualAddress;
1001   bfd_vma idata_section_va = bfd_section_vma (idata_section);
1002
1003   /* The section's virtual address as reported by BFD has the image base applied,
1004      remove it.  */
1005   gdb_assert (idata_section_va >= pe_extra->ImageBase);
1006   idata_section_va -= pe_extra->ImageBase;
1007
1008   bfd_vma idata_section_end_va = idata_section_va + idata_section_size;
1009
1010   /* Make sure that the import table is indeed within the .idata section's range.  */
1011   if (import_table_va < idata_section_va
1012       || import_table_va >= idata_section_end_va)
1013     {
1014       warning (_("\
1015 %s: import table's virtual address (0x%" BFD_VMA_FMT "x) is outside .idata \
1016 section's range [0x%" BFD_VMA_FMT "x, 0x%" BFD_VMA_FMT "x[."),
1017                bfd_get_filename (abfd), import_table_va, idata_section_va,
1018                idata_section_end_va);
1019       return false;
1020     }
1021
1022   /* The import table starts at this offset into the .idata section.  */
1023   bfd_vma import_table_offset_in_sect = import_table_va - idata_section_va;
1024
1025   /* Get the section's data.  */
1026   gdb::byte_vector idata_contents;
1027   if (!gdb_bfd_get_full_section_contents (abfd, idata_section, &idata_contents))
1028     {
1029       warning (_("%s: failed to get contents of .idata section."),
1030                bfd_get_filename (abfd));
1031       return false;
1032     }
1033
1034   gdb_assert (idata_contents.size () == idata_section_size);
1035
1036   const gdb_byte *iter = idata_contents.data () + import_table_offset_in_sect;
1037   const gdb_byte *end = idata_contents.data () + idata_section_size;
1038   const pe_import_directory_entry null_dir_entry = { 0 };
1039
1040   /* Iterate through all directory entries.  */
1041   while (true)
1042     {
1043       /* Is there enough space left in the section for another entry?  */
1044       if (iter + sizeof (pe_import_directory_entry) > end)
1045         {
1046           warning (_("%s: unexpected end of .idata section."),
1047                    bfd_get_filename (abfd));
1048           break;
1049         }
1050
1051       pe_import_directory_entry *dir_entry = (pe_import_directory_entry *) iter;
1052
1053       /* Is it the end of list marker?  */
1054       if (memcmp (dir_entry, &null_dir_entry,
1055                   sizeof (pe_import_directory_entry)) == 0)
1056         break;
1057
1058       bfd_vma name_va = dir_entry->name_rva;
1059
1060       /* If the name's virtual address is smaller than the section's virtual
1061          address, there's a problem.  */
1062       if (name_va < idata_section_va || name_va >= idata_section_end_va)
1063         {
1064           warning (_("\
1065 %s: name's virtual address (0x%" BFD_VMA_FMT "x) is outside .idata section's \
1066 range [0x%" BFD_VMA_FMT "x, 0x%" BFD_VMA_FMT "x[."),
1067                    bfd_get_filename (abfd), name_va, idata_section_va,
1068                    idata_section_end_va);
1069           break;
1070         }
1071
1072       const gdb_byte *name = &idata_contents[name_va - idata_section_va];
1073
1074       /* Make sure we don't overshoot the end of the section with the streq.  */
1075       if (name + sizeof (CYGWIN_DLL_NAME) > end)
1076         continue;
1077
1078       /* Finally, check if this is the dll name we are looking for.  */
1079       if (streq ((const char *) name, CYGWIN_DLL_NAME))
1080         return true;
1081
1082       iter += sizeof (pe_import_directory_entry);
1083     }
1084
1085     return false;
1086 }
1087
1088 void _initialize_windows_tdep ();
1089 void
1090 _initialize_windows_tdep ()
1091 {
1092   windows_gdbarch_data_handle
1093     = gdbarch_data_register_post_init (init_windows_gdbarch_data);
1094
1095   init_w32_command_list ();
1096   add_cmd ("thread-information-block", class_info, display_tib,
1097            _("Display thread information block."),
1098            &info_w32_cmdlist);
1099   add_alias_cmd ("tib", "thread-information-block", class_info, 1,
1100                  &info_w32_cmdlist);
1101
1102   add_setshow_boolean_cmd ("show-all-tib", class_maintenance,
1103                            &maint_display_all_tib, _("\
1104 Set whether to display all non-zero fields of thread information block."), _("\
1105 Show whether to display all non-zero fields of thread information block."), _("\
1106 Use \"on\" to enable, \"off\" to disable.\n\
1107 If enabled, all non-zero fields of thread information block are displayed,\n\
1108 even if their meaning is unknown."),
1109                            NULL,
1110                            show_maint_show_all_tib,
1111                            &maintenance_set_cmdlist,
1112                            &maintenance_show_cmdlist);
1113
1114   /* Explicitly create without lookup, since that tries to create a
1115      value with a void typed value, and when we get here, gdbarch
1116      isn't initialized yet.  At this point, we're quite sure there
1117      isn't another convenience variable of the same name.  */
1118   create_internalvar_type_lazy ("_tlb", &tlb_funcs, NULL);
1119 }