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 /* Implementation of `gdbarch_gdb_signal_to_target' for Windows.  */
 606
 607 static int
 608 windows_gdb_signal_to_target (struct gdbarch *gdbarch, enum gdb_signal signal)
 609 {
 610   switch (signal)
 611     {
 612     case GDB_SIGNAL_0:
 613       return 0;
 614     case GDB_SIGNAL_HUP:
 615       return WINDOWS_SIGHUP;
 616     case GDB_SIGNAL_INT:
 617       return WINDOWS_SIGINT;
 618     case GDB_SIGNAL_QUIT:
 619       return WINDOWS_SIGQUIT;
 620     case GDB_SIGNAL_ILL:
 621       return WINDOWS_SIGILL;
 622     case GDB_SIGNAL_TRAP:
 623       return WINDOWS_SIGTRAP;
 624     case GDB_SIGNAL_ABRT:
 625       return WINDOWS_SIGABRT;
 626     case GDB_SIGNAL_EMT:
 627       return WINDOWS_SIGEMT;
 628     case GDB_SIGNAL_FPE:
 629       return WINDOWS_SIGFPE;
 630     case GDB_SIGNAL_KILL:
 631       return WINDOWS_SIGKILL;
 632     case GDB_SIGNAL_BUS:
 633       return WINDOWS_SIGBUS;
 634     case GDB_SIGNAL_SEGV:
 635       return WINDOWS_SIGSEGV;
 636     case GDB_SIGNAL_SYS:
 637       return WINDOWS_SIGSYS;
 638     case GDB_SIGNAL_PIPE:
 639       return WINDOWS_SIGPIPE;
 640     case GDB_SIGNAL_ALRM:
 641       return WINDOWS_SIGALRM;
 642     case GDB_SIGNAL_TERM:
 643       return WINDOWS_SIGTERM;
 644     }
 645   return -1;
 646 }
 647
 648 /* Implementation of `gdbarch_gdb_signal_to_target' for Cygwin.  */
 649
 650 static int
 651 cygwin_gdb_signal_to_target (struct gdbarch *gdbarch, enum gdb_signal signal)
 652 {
 653   switch (signal)
 654     {
 655     case GDB_SIGNAL_0:
 656       return 0;
 657     case GDB_SIGNAL_HUP:
 658       return CYGWIN_SIGHUP;
 659     case GDB_SIGNAL_INT:
 660       return CYGWIN_SIGINT;
 661     case GDB_SIGNAL_QUIT:
 662       return CYGWIN_SIGQUIT;
 663     case GDB_SIGNAL_ILL:
 664       return CYGWIN_SIGILL;
 665     case GDB_SIGNAL_TRAP:
 666       return CYGWIN_SIGTRAP;
 667     case GDB_SIGNAL_ABRT:
 668       return CYGWIN_SIGABRT;
 669     case GDB_SIGNAL_EMT:
 670       return CYGWIN_SIGEMT;
 671     case GDB_SIGNAL_FPE:
 672       return CYGWIN_SIGFPE;
 673     case GDB_SIGNAL_KILL:
 674       return CYGWIN_SIGKILL;
 675     case GDB_SIGNAL_BUS:
 676       return CYGWIN_SIGBUS;
 677     case GDB_SIGNAL_SEGV:
 678       return CYGWIN_SIGSEGV;
 679     case GDB_SIGNAL_SYS:
 680       return CYGWIN_SIGSYS;
 681     case GDB_SIGNAL_PIPE:
 682       return CYGWIN_SIGPIPE;
 683     case GDB_SIGNAL_ALRM:
 684       return CYGWIN_SIGALRM;
 685     case GDB_SIGNAL_TERM:
 686       return CYGWIN_SIGTERM;
 687     case GDB_SIGNAL_URG:
 688       return CYGWIN_SIGURG;
 689     case GDB_SIGNAL_STOP:
 690       return CYGWIN_SIGSTOP;
 691     case GDB_SIGNAL_TSTP:
 692       return CYGWIN_SIGTSTP;
 693     case GDB_SIGNAL_CONT:
 694       return CYGWIN_SIGCONT;
 695     case GDB_SIGNAL_CHLD:
 696       return CYGWIN_SIGCHLD;
 697     case GDB_SIGNAL_TTIN:
 698       return CYGWIN_SIGTTIN;
 699     case GDB_SIGNAL_TTOU:
 700       return CYGWIN_SIGTTOU;
 701     case GDB_SIGNAL_IO:
 702       return CYGWIN_SIGIO;
 703     case GDB_SIGNAL_XCPU:
 704       return CYGWIN_SIGXCPU;
 705     case GDB_SIGNAL_XFSZ:
 706       return CYGWIN_SIGXFSZ;
 707     case GDB_SIGNAL_VTALRM:
 708       return CYGWIN_SIGVTALRM;
 709     case GDB_SIGNAL_PROF:
 710       return CYGWIN_SIGPROF;
 711     case GDB_SIGNAL_WINCH:
 712       return CYGWIN_SIGWINCH;
 713     case GDB_SIGNAL_PWR:
 714       return CYGWIN_SIGLOST;
 715     case GDB_SIGNAL_USR1:
 716       return CYGWIN_SIGUSR1;
 717     case GDB_SIGNAL_USR2:
 718       return CYGWIN_SIGUSR2;
 719     }
 720   return -1;
 721 }
 722
 723 struct enum_value_name
 724 {
 725   uint32_t value;
 726   const char *name;
 727 };
 728
 729 /* Allocate a TYPE_CODE_ENUM type structure with its named values.  */
 730
 731 static struct type *
 732 create_enum (struct gdbarch *gdbarch, int bit, const char *name,
 733              const struct enum_value_name *values, int count)
 734 {
 735   struct type *type;
 736   int i;
 737
 738   type = arch_type (gdbarch, TYPE_CODE_ENUM, bit, name);
 739   TYPE_NFIELDS (type) = count;
 740   TYPE_FIELDS (type) = (struct field *)
 741     TYPE_ZALLOC (type, sizeof (struct field) * count);
 742   TYPE_UNSIGNED (type) = 1;
 743
 744   for (i = 0; i < count; i++)
 745   {
 746     TYPE_FIELD_NAME (type, i) = values[i].name;
 747     SET_FIELD_ENUMVAL (TYPE_FIELD (type, i), values[i].value);
 748   }
 749
 750   return type;
 751 }
 752
 753 static const struct enum_value_name exception_values[] =
 754 {
 755   { 0x40000015, "FATAL_APP_EXIT" },
 756   { 0x40010005, "DBG_CONTROL_C" },
 757   { 0x40010008, "DBG_CONTROL_BREAK" },
 758   { 0x80000002, "DATATYPE_MISALIGNMENT" },
 759   { 0x80000003, "BREAKPOINT" },
 760   { 0x80000004, "SINGLE_STEP" },
 761   { 0xC0000005, "ACCESS_VIOLATION" },
 762   { 0xC0000006, "IN_PAGE_ERROR" },
 763   { 0xC000001D, "ILLEGAL_INSTRUCTION" },
 764   { 0xC0000025, "NONCONTINUABLE_EXCEPTION" },
 765   { 0xC0000026, "INVALID_DISPOSITION" },
 766   { 0xC000008C, "ARRAY_BOUNDS_EXCEEDED" },
 767   { 0xC000008D, "FLOAT_DENORMAL_OPERAND" },
 768   { 0xC000008E, "FLOAT_DIVIDE_BY_ZERO" },
 769   { 0xC000008F, "FLOAT_INEXACT_RESULT" },
 770   { 0xC0000090, "FLOAT_INVALID_OPERATION" },
 771   { 0xC0000091, "FLOAT_OVERFLOW" },
 772   { 0xC0000092, "FLOAT_STACK_CHECK" },
 773   { 0xC0000093, "FLOAT_UNDERFLOW" },
 774   { 0xC0000094, "INTEGER_DIVIDE_BY_ZERO" },
 775   { 0xC0000095, "INTEGER_OVERFLOW" },
 776   { 0xC0000096, "PRIV_INSTRUCTION" },
 777   { 0xC00000FD, "STACK_OVERFLOW" },
 778   { 0xC0000409, "FAST_FAIL" },
 779 };
 780
 781 static const struct enum_value_name violation_values[] =
 782 {
 783   { 0, "READ_ACCESS_VIOLATION" },
 784   { 1, "WRITE_ACCESS_VIOLATION" },
 785   { 8, "DATA_EXECUTION_PREVENTION_VIOLATION" },
 786 };
 787
 788 /* Implement the "get_siginfo_type" gdbarch method.  */
 789
 790 static struct type *
 791 windows_get_siginfo_type (struct gdbarch *gdbarch)
 792 {
 793   struct windows_gdbarch_data *windows_gdbarch_data;
 794   struct type *dword_type, *pvoid_type, *ulongptr_type;
 795   struct type *code_enum, *violation_enum;
 796   struct type *violation_type, *para_type, *siginfo_ptr_type, *siginfo_type;
 797
 798   windows_gdbarch_data = get_windows_gdbarch_data (gdbarch);
 799   if (windows_gdbarch_data->siginfo_type != NULL)
 800     return windows_gdbarch_data->siginfo_type;
 801
 802   dword_type = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch),
 803                                   1, "DWORD");
 804   pvoid_type = arch_pointer_type (gdbarch, gdbarch_ptr_bit (gdbarch), "PVOID",
 805                                   builtin_type (gdbarch)->builtin_void);
 806   ulongptr_type = arch_integer_type (gdbarch, gdbarch_ptr_bit (gdbarch),
 807                                      1, "ULONG_PTR");
 808
 809   /* ExceptionCode value names */
 810   code_enum = create_enum (gdbarch, gdbarch_int_bit (gdbarch),
 811                            "ExceptionCode", exception_values,
 812                            ARRAY_SIZE (exception_values));
 813
 814   /* ACCESS_VIOLATION type names */
 815   violation_enum = create_enum (gdbarch, gdbarch_ptr_bit (gdbarch),
 816                                 "ViolationType", violation_values,
 817                                 ARRAY_SIZE (violation_values));
 818
 819   /* ACCESS_VIOLATION information */
 820   violation_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);
 821   append_composite_type_field (violation_type, "Type", violation_enum);
 822   append_composite_type_field (violation_type, "Address", pvoid_type);
 823
 824   /* Unnamed union of the documented field ExceptionInformation,
 825      and the alternative AccessViolationInformation (which displays
 826      human-readable values for ExceptionCode ACCESS_VIOLATION).  */
 827   para_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_UNION);
 828   append_composite_type_field (para_type, "ExceptionInformation",
 829                                lookup_array_range_type (ulongptr_type, 0, 14));
 830   append_composite_type_field (para_type, "AccessViolationInformation",
 831                                violation_type);
 832
 833   siginfo_type = arch_composite_type (gdbarch, "EXCEPTION_RECORD",
 834                                       TYPE_CODE_STRUCT);
 835   siginfo_ptr_type = arch_pointer_type (gdbarch, gdbarch_ptr_bit (gdbarch),
 836                                         NULL, siginfo_type);
 837
 838   /* ExceptionCode is documented as type DWORD, but here a helper
 839      enum type is used instead to display a human-readable value.  */
 840   append_composite_type_field (siginfo_type, "ExceptionCode", code_enum);
 841   append_composite_type_field (siginfo_type, "ExceptionFlags", dword_type);
 842   append_composite_type_field (siginfo_type, "ExceptionRecord",
 843                                siginfo_ptr_type);
 844   append_composite_type_field (siginfo_type, "ExceptionAddress",
 845                                pvoid_type);
 846   append_composite_type_field (siginfo_type, "NumberParameters", dword_type);
 847   /* The 64-bit variant needs some padding.  */
 848   append_composite_type_field_aligned (siginfo_type, "",
 849                                        para_type, TYPE_LENGTH (ulongptr_type));
 850
 851   windows_gdbarch_data->siginfo_type = siginfo_type;
 852
 853   return siginfo_type;
 854 }
 855
 856 /* Implement the "solib_create_inferior_hook" target_so_ops method.  */
 857
 858 static void
 859 windows_solib_create_inferior_hook (int from_tty)
 860 {
 861   CORE_ADDR exec_base = 0;
 862
 863   /* Find base address of main executable in
 864      TIB->process_environment_block->image_base_address.  */
 865   struct gdbarch *gdbarch = target_gdbarch ();
 866   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 867   int ptr_bytes;
 868   int peb_offset;  /* Offset of process_environment_block in TIB.  */
 869   int base_offset; /* Offset of image_base_address in PEB.  */
 870   if (gdbarch_ptr_bit (gdbarch) == 32)
 871     {
 872       ptr_bytes = 4;
 873       peb_offset = 48;
 874       base_offset = 8;
 875     }
 876   else
 877     {
 878       ptr_bytes = 8;
 879       peb_offset = 96;
 880       base_offset = 16;
 881     }
 882   CORE_ADDR tlb;
 883   gdb_byte buf[8];
 884   if (target_has_execution
 885       && target_get_tib_address (inferior_ptid, &tlb)
 886       && !target_read_memory (tlb + peb_offset, buf, ptr_bytes))
 887     {
 888       CORE_ADDR peb = extract_unsigned_integer (buf, ptr_bytes, byte_order);
 889       if (!target_read_memory (peb + base_offset, buf, ptr_bytes))
 890         exec_base = extract_unsigned_integer (buf, ptr_bytes, byte_order);
 891     }
 892
 893   /* Rebase executable if the base address changed because of ASLR.  */
 894   if (symfile_objfile != nullptr && exec_base != 0)
 895     {
 896       CORE_ADDR vmaddr = pe_data (exec_bfd)->pe_opthdr.ImageBase;
 897       if (vmaddr != exec_base)
 898         objfile_rebase (symfile_objfile, exec_base - vmaddr);
 899     }
 900 }
 901
 902 static struct target_so_ops windows_so_ops;
 903
 904 /* Common parts for gdbarch initialization for the Windows and Cygwin OS
 905    ABIs.  */
 906
 907 static void
 908 windows_init_abi_common (struct gdbarch_info info, struct gdbarch *gdbarch)
 909 {
 910   set_gdbarch_wchar_bit (gdbarch, 16);
 911   set_gdbarch_wchar_signed (gdbarch, 0);
 912
 913   /* Canonical paths on this target look like
 914      `c:\Program Files\Foo App\mydll.dll', for example.  */
 915   set_gdbarch_has_dos_based_file_system (gdbarch, 1);
 916
 917   set_gdbarch_iterate_over_objfiles_in_search_order
 918     (gdbarch, windows_iterate_over_objfiles_in_search_order);
 919
 920   windows_so_ops = solib_target_so_ops;
 921   windows_so_ops.solib_create_inferior_hook
 922     = windows_solib_create_inferior_hook;
 923   set_solib_ops (gdbarch, &windows_so_ops);
 924
 925   set_gdbarch_get_siginfo_type (gdbarch, windows_get_siginfo_type);
 926 }
 927
 928 /* See windows-tdep.h.  */
 929 void
 930 windows_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 931 {
 932   windows_init_abi_common (info, gdbarch);
 933   set_gdbarch_gdb_signal_to_target (gdbarch, windows_gdb_signal_to_target);
 934 }
 935
 936 /* See windows-tdep.h.  */
 937
 938 void
 939 cygwin_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 940 {
 941   windows_init_abi_common (info, gdbarch);
 942   set_gdbarch_gdb_signal_to_target (gdbarch, cygwin_gdb_signal_to_target);
 943 }
 944
 945 /* Implementation of `tlb' variable.  */
 946
 947 static const struct internalvar_funcs tlb_funcs =
 948 {
 949   tlb_make_value,
 950   NULL,
 951   NULL
 952 };
 953
 954 /* Layout of an element of a PE's Import Directory Table.  Based on:
 955
 956      https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#import-directory-table
 957  */
 958
 959 struct pe_import_directory_entry
 960 {
 961   uint32_t import_lookup_table_rva;
 962   uint32_t timestamp;
 963   uint32_t forwarder_chain;
 964   uint32_t name_rva;
 965   uint32_t import_address_table_rva;
 966 };
 967
 968 gdb_static_assert (sizeof (pe_import_directory_entry) == 20);
 969
 970 /* See windows-tdep.h.  */
 971
 972 bool
 973 is_linked_with_cygwin_dll (bfd *abfd)
 974 {
 975   /* The list of DLLs a PE is linked to is in the .idata section.  See:
 976
 977      https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#the-idata-section
 978    */
 979   asection *idata_section = bfd_get_section_by_name (abfd, ".idata");
 980   if (idata_section == nullptr)
 981     return false;
 982
 983   bfd_size_type idata_section_size = bfd_section_size (idata_section);
 984   internal_extra_pe_aouthdr *pe_extra = &pe_data (abfd)->pe_opthdr;
 985   bfd_vma import_table_va = pe_extra->DataDirectory[PE_IMPORT_TABLE].VirtualAddress;
 986   bfd_vma idata_section_va = bfd_section_vma (idata_section);
 987
 988   /* The section's virtual address as reported by BFD has the image base applied,
 989      remove it.  */
 990   gdb_assert (idata_section_va >= pe_extra->ImageBase);
 991   idata_section_va -= pe_extra->ImageBase;
 992
 993   bfd_vma idata_section_end_va = idata_section_va + idata_section_size;
 994
 995   /* Make sure that the import table is indeed within the .idata section's range.  */
 996   if (import_table_va < idata_section_va
 997       || import_table_va >= idata_section_end_va)
 998     {
 999       warning (_("\
1000 %s: import table's virtual address (0x%" BFD_VMA_FMT "x) is outside .idata \
1001 section's range [0x%" BFD_VMA_FMT "x, 0x%" BFD_VMA_FMT "x[."),
1002                bfd_get_filename (abfd), import_table_va, idata_section_va,
1003                idata_section_end_va);
1004       return false;
1005     }
1006
1007   /* The import table starts at this offset into the .idata section.  */
1008   bfd_vma import_table_offset_in_sect = import_table_va - idata_section_va;
1009
1010   /* Get the section's data.  */
1011   gdb::byte_vector idata_contents;
1012   if (!gdb_bfd_get_full_section_contents (abfd, idata_section, &idata_contents))
1013     {
1014       warning (_("%s: failed to get contents of .idata section."),
1015                bfd_get_filename (abfd));
1016       return false;
1017     }
1018
1019   gdb_assert (idata_contents.size () == idata_section_size);
1020
1021   const gdb_byte *iter = idata_contents.data () + import_table_offset_in_sect;
1022   const gdb_byte *end = idata_contents.data () + idata_section_size;
1023   const pe_import_directory_entry null_dir_entry = { 0 };
1024
1025   /* Iterate through all directory entries.  */
1026   while (true)
1027     {
1028       /* Is there enough space left in the section for another entry?  */
1029       if (iter + sizeof (pe_import_directory_entry) > end)
1030         {
1031           warning (_("%s: unexpected end of .idata section."),
1032                    bfd_get_filename (abfd));
1033           break;
1034         }
1035
1036       pe_import_directory_entry *dir_entry = (pe_import_directory_entry *) iter;
1037
1038       /* Is it the end of list marker?  */
1039       if (memcmp (dir_entry, &null_dir_entry,
1040                   sizeof (pe_import_directory_entry)) == 0)
1041         break;
1042
1043       bfd_vma name_va = dir_entry->name_rva;
1044
1045       /* If the name's virtual address is smaller than the section's virtual
1046          address, there's a problem.  */
1047       if (name_va < idata_section_va || name_va >= idata_section_end_va)
1048         {
1049           warning (_("\
1050 %s: name's virtual address (0x%" BFD_VMA_FMT "x) is outside .idata section's \
1051 range [0x%" BFD_VMA_FMT "x, 0x%" BFD_VMA_FMT "x[."),
1052                    bfd_get_filename (abfd), name_va, idata_section_va,
1053                    idata_section_end_va);
1054           break;
1055         }
1056
1057       const gdb_byte *name = &idata_contents[name_va - idata_section_va];
1058
1059       /* Make sure we don't overshoot the end of the section with the streq.  */
1060       if (name + sizeof (CYGWIN_DLL_NAME) > end)
1061         continue;
1062
1063       /* Finally, check if this is the dll name we are looking for.  */
1064       if (streq ((const char *) name, CYGWIN_DLL_NAME))
1065         return true;
1066
1067       iter += sizeof (pe_import_directory_entry);
1068     }
1069
1070     return false;
1071 }
1072
1073 void _initialize_windows_tdep ();
1074 void
1075 _initialize_windows_tdep ()
1076 {
1077   windows_gdbarch_data_handle
1078     = gdbarch_data_register_post_init (init_windows_gdbarch_data);
1079
1080   add_basic_prefix_cmd ("w32", class_info,
1081                         _("Print information specific to Win32 debugging."),
1082                         &info_w32_cmdlist, "info w32 ", 0, &infolist);
1083
1084   add_cmd ("thread-information-block", class_info, display_tib,
1085            _("Display thread information block."),
1086            &info_w32_cmdlist);
1087   add_alias_cmd ("tib", "thread-information-block", class_info, 1,
1088                  &info_w32_cmdlist);
1089
1090   add_setshow_boolean_cmd ("show-all-tib", class_maintenance,
1091                            &maint_display_all_tib, _("\
1092 Set whether to display all non-zero fields of thread information block."), _("\
1093 Show whether to display all non-zero fields of thread information block."), _("\
1094 Use \"on\" to enable, \"off\" to disable.\n\
1095 If enabled, all non-zero fields of thread information block are displayed,\n\
1096 even if their meaning is unknown."),
1097                            NULL,
1098                            show_maint_show_all_tib,
1099                            &maintenance_set_cmdlist,
1100                            &maintenance_show_cmdlist);
1101
1102   /* Explicitly create without lookup, since that tries to create a
1103      value with a void typed value, and when we get here, gdbarch
1104      isn't initialized yet.  At this point, we're quite sure there
1105      isn't another convenience variable of the same name.  */
1106   create_internalvar_type_lazy ("_tlb", &tlb_funcs, NULL);
1107 }