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/* Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"

#include "windows-tdep.h"

#include "gdb_obstack.h"

#include "xml-support.h"

#include "gdbarch.h"

#include "target.h"

#include "value.h"

#include "inferior.h"

#include "command.h"

#include "gdbcmd.h"

#include "gdbthread.h"

struct cmd_list_element *info_w32_cmdlist;

typedef struct thread_information_block_32

  {

    uint32_t current_seh;                       /* %fs:0x0000 */

    uint32_t current_top_of_stack;              /* %fs:0x0004 */

    uint32_t current_bottom_of_stack;           /* %fs:0x0008 */

    uint32_t sub_system_tib;                    /* %fs:0x000c */

    uint32_t fiber_data;                        /* %fs:0x0010 */

    uint32_t arbitrary_data_slot;               /* %fs:0x0014 */

    uint32_t linear_address_tib;                /* %fs:0x0018 */

    uint32_t environment_pointer;               /* %fs:0x001c */

    uint32_t process_id;                        /* %fs:0x0020 */

    uint32_t current_thread_id;                 /* %fs:0x0024 */

    uint32_t active_rpc_handle;                 /* %fs:0x0028 */

    uint32_t thread_local_storage;              /* %fs:0x002c */

    uint32_t process_environment_block;         /* %fs:0x0030 */

    uint32_t last_error_number;                 /* %fs:0x0034 */

  }

thread_information_32;

typedef struct thread_information_block_64

  {

    uint64_t current_seh;                       /* %gs:0x0000 */

    uint64_t current_top_of_stack;              /* %gs:0x0008 */

    uint64_t current_bottom_of_stack;           /* %gs:0x0010 */

    uint64_t sub_system_tib;                    /* %gs:0x0018 */

    uint64_t fiber_data;                        /* %gs:0x0020 */

    uint64_t arbitrary_data_slot;               /* %gs:0x0028 */

    uint64_t linear_address_tib;                /* %gs:0x0030 */

    uint64_t environment_pointer;               /* %gs:0x0038 */

    uint64_t process_id;                        /* %gs:0x0040 */

    uint64_t current_thread_id;                 /* %gs:0x0048 */

    uint64_t active_rpc_handle;                 /* %gs:0x0050 */

    uint64_t thread_local_storage;              /* %gs:0x0058 */

    uint64_t process_environment_block;         /* %gs:0x0060 */

    uint64_t last_error_number;                 /* %gs:0x0068 */

  }

thread_information_64;

static const char* TIB_NAME[] =

  {

    " current_seh                 ",    /* %fs:0x0000 */

    " current_top_of_stack        ",    /* %fs:0x0004 */

    " current_bottom_of_stack     ",    /* %fs:0x0008 */

    " sub_system_tib              ",    /* %fs:0x000c */

    " fiber_data                  ",    /* %fs:0x0010 */

    " arbitrary_data_slot         ",    /* %fs:0x0014 */

    " linear_address_tib          ",    /* %fs:0x0018 */

    " environment_pointer         ",    /* %fs:0x001c */

    " process_id                  ",    /* %fs:0x0020 */

    " current_thread_id           ",    /* %fs:0x0024 */

    " active_rpc_handle           ",    /* %fs:0x0028 */

    " thread_local_storage        ",    /* %fs:0x002c */

    " process_environment_block   ",    /* %fs:0x0030 */

    " last_error_number           "     /* %fs:0x0034 */

  };

static const int MAX_TIB32 = sizeof (thread_information_32) / sizeof (uint32_t);

static const int MAX_TIB64 = sizeof (thread_information_64) / sizeof (uint64_t);

static const int FULL_TIB_SIZE = 0x1000;

static int maint_display_all_tib = 0;

/* Define Thread Local Base pointer type.  */

static struct type *

windows_get_tlb_type (struct gdbarch *gdbarch)

{

  static struct gdbarch *last_gdbarch = NULL;

  static struct type *last_tlb_type = NULL;

  struct type *dword_ptr_type, *dword32_type, *void_ptr_type;

  struct type *peb_ldr_type, *peb_ldr_ptr_type;

  struct type *peb_type, *peb_ptr_type, *list_type, *list_ptr_type;

  struct type *module_list_ptr_type;

  struct type *tib_type, *seh_type, *tib_ptr_type, *seh_ptr_type;

  /* Do not rebuild type if same gdbarch as last time.  */

  if (last_tlb_type && last_gdbarch == gdbarch)

    return last_tlb_type;

  dword_ptr_type = arch_integer_type (gdbarch, gdbarch_ptr_bit (gdbarch),

                                 1, "DWORD_PTR");

  dword32_type = arch_integer_type (gdbarch, 32,

                                 1, "DWORD32");

  void_ptr_type = lookup_pointer_type (builtin_type (gdbarch)->builtin_void);

  /* list entry */

  list_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);

  TYPE_NAME (list_type) = xstrdup ("list");

  list_ptr_type = arch_type (gdbarch, TYPE_CODE_PTR,

                            TYPE_LENGTH (void_ptr_type), NULL);

  module_list_ptr_type = void_ptr_type;

  append_composite_type_field (list_type, "forward_list", module_list_ptr_type);

  append_composite_type_field (list_type, "backward_list",

                               module_list_ptr_type);

  /* Structured Exception Handler */

  seh_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);

  TYPE_NAME (seh_type) = xstrdup ("seh");

  seh_ptr_type = arch_type (gdbarch, TYPE_CODE_PTR,

                            TYPE_LENGTH (void_ptr_type), NULL);

  TYPE_TARGET_TYPE (seh_ptr_type) = seh_type;

  append_composite_type_field (seh_type, "next_seh", seh_ptr_type);

  append_composite_type_field (seh_type, "handler",

                               builtin_type (gdbarch)->builtin_func_ptr);

  /* struct _PEB_LDR_DATA */

  peb_ldr_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);

  TYPE_NAME (peb_ldr_type) = xstrdup ("peb_ldr_data");

  append_composite_type_field (peb_ldr_type, "length", dword32_type);

  append_composite_type_field (peb_ldr_type, "initialized", dword32_type);

  append_composite_type_field (peb_ldr_type, "ss_handle", void_ptr_type);

  append_composite_type_field (peb_ldr_type, "in_load_order", list_type);

  append_composite_type_field (peb_ldr_type, "in_memory_order", list_type);

  append_composite_type_field (peb_ldr_type, "in_init_order", list_type);

  append_composite_type_field (peb_ldr_type, "entry_in_progress",

                               void_ptr_type);

  peb_ldr_ptr_type = arch_type (gdbarch, TYPE_CODE_PTR,

                            TYPE_LENGTH (void_ptr_type), NULL);

  TYPE_TARGET_TYPE (peb_ldr_ptr_type) = peb_ldr_type;

  /* struct process environment block */

  peb_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);

  TYPE_NAME (peb_type) = xstrdup ("peb");

  /* First bytes contain several flags.  */

  append_composite_type_field (peb_type, "flags", dword_ptr_type);

  append_composite_type_field (peb_type, "mutant", void_ptr_type);

  append_composite_type_field (peb_type, "image_base_address", void_ptr_type);

  append_composite_type_field (peb_type, "ldr", peb_ldr_ptr_type);

  append_composite_type_field (peb_type, "process_parameters", void_ptr_type);

  append_composite_type_field (peb_type, "sub_system_data", void_ptr_type);

  append_composite_type_field (peb_type, "process_heap", void_ptr_type);

  append_composite_type_field (peb_type, "fast_peb_lock", void_ptr_type);

  peb_ptr_type = arch_type (gdbarch, TYPE_CODE_PTR,

                            TYPE_LENGTH (void_ptr_type), NULL);

  TYPE_TARGET_TYPE (peb_ptr_type) = peb_type;

  /* struct thread information block */

  tib_type = arch_composite_type (gdbarch, NULL, TYPE_CODE_STRUCT);

  TYPE_NAME (tib_type) = xstrdup ("tib");

  /* uint32_t current_seh;                      %fs:0x0000 */

  append_composite_type_field (tib_type, "current_seh", seh_ptr_type);

  /* uint32_t current_top_of_stack;             %fs:0x0004 */

  append_composite_type_field (tib_type, "current_top_of_stack", void_ptr_type);

  /* uint32_t current_bottom_of_stack;          %fs:0x0008 */

  append_composite_type_field (tib_type, "current_bottom_of_stack",

                               void_ptr_type);

  /* uint32_t sub_system_tib;                   %fs:0x000c */

  append_composite_type_field (tib_type, "sub_system_tib", void_ptr_type);

  /* uint32_t fiber_data;                       %fs:0x0010 */

  append_composite_type_field (tib_type, "fiber_data", void_ptr_type);

  /* uint32_t arbitrary_data_slot;              %fs:0x0014 */

  append_composite_type_field (tib_type, "arbitrary_data_slot", void_ptr_type);

  /* uint32_t linear_address_tib;               %fs:0x0018 */

  append_composite_type_field (tib_type, "linear_address_tib", void_ptr_type);

  /* uint32_t environment_pointer;              %fs:0x001c */

  append_composite_type_field (tib_type, "environment_pointer", void_ptr_type);

  /* uint32_t process_id;                       %fs:0x0020 */

  append_composite_type_field (tib_type, "process_id", dword_ptr_type);

  /* uint32_t current_thread_id;                %fs:0x0024 */

  append_composite_type_field (tib_type, "thread_id", dword_ptr_type);

  /* uint32_t active_rpc_handle;                %fs:0x0028 */

  append_composite_type_field (tib_type, "active_rpc_handle", dword_ptr_type);

  /* uint32_t thread_local_storage;             %fs:0x002c */

  append_composite_type_field (tib_type, "thread_local_storage", void_ptr_type);

  /* uint32_t process_environment_block;        %fs:0x0030 */

  append_composite_type_field (tib_type, "process_environment_block",

                               peb_ptr_type);

  /* uint32_t last_error_number;                %fs:0x0034 */

  append_composite_type_field (tib_type, "last_error_number", dword_ptr_type);

  tib_ptr_type = arch_type (gdbarch, TYPE_CODE_PTR,

                            TYPE_LENGTH (void_ptr_type), NULL);

  TYPE_TARGET_TYPE (tib_ptr_type) = tib_type;

  last_tlb_type = tib_ptr_type;

  last_gdbarch = gdbarch;

  return tib_ptr_type;

}

/* The $_tlb convenience variable is a bit special.  We don't know

   for sure the type of the value until we actually have a chance to

   fetch the data.  The type can change depending on gdbarch, so it is

   also dependent on which thread you have selected.  */

/* This function implements the lval_computed support for reading a

   $_tlb value.  */

static void

tlb_value_read (struct value *val)

{

  CORE_ADDR tlb;

  struct type *type = check_typedef (value_type (val));

  if (!target_get_tib_address (inferior_ptid, &tlb))

    error (_("Unable to read tlb"));

  store_typed_address (value_contents_raw (val), type, tlb);

}

/* This function implements the lval_computed support for writing a

   $_tlb value.  */

static void

tlb_value_write (struct value *v, struct value *fromval)

{

  error (_("Impossible to change the Thread Local Base"));

}

static struct lval_funcs tlb_value_funcs =

  {

    tlb_value_read,

    tlb_value_write

  };

/* Return a new value with the correct type for the tlb object of

   the current thread using architecture GDBARCH.  Return a void value

   if there's no object available.  */

static struct value *

tlb_make_value (struct gdbarch *gdbarch, struct internalvar *var)

{

  if (target_has_stack && !ptid_equal (inferior_ptid, null_ptid))

    {

      struct type *type = windows_get_tlb_type (gdbarch);

      return allocate_computed_value (type, &tlb_value_funcs, NULL);

    }

  return allocate_value (builtin_type (gdbarch)->builtin_void);

}

/* Display thread information block of a given thread.  */

static int

display_one_tib (ptid_t ptid)

{

  gdb_byte *tib = NULL;

  gdb_byte *index;

  CORE_ADDR thread_local_base;

  ULONGEST i, val, max, max_name, size, tib_size;

  ULONGEST sizeof_ptr = gdbarch_ptr_bit (target_gdbarch);

  enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch);

  if (sizeof_ptr == 64)

    {

      size = sizeof (uint64_t);

      tib_size = sizeof (thread_information_64);

      max = MAX_TIB64;

    }

  else

    {

      size = sizeof (uint32_t);

      tib_size = sizeof (thread_information_32);

      max = MAX_TIB32;

    }

  max_name = max;

  if (maint_display_all_tib)

    {

      tib_size = FULL_TIB_SIZE;

      max = tib_size / size;

    }

  tib = alloca (tib_size);

  if (target_get_tib_address (ptid, &thread_local_base) == 0)

    {

      printf_filtered (_("Unable to get thread local base for %s\n"),

        target_pid_to_str (ptid));

      return -1;

    }

  if (target_read (&current_target, TARGET_OBJECT_MEMORY,

                   NULL, tib, thread_local_base, tib_size) != tib_size)

    {

      printf_filtered (_("Unable to read thread information block for %s at \

address %s\n"),

        target_pid_to_str (ptid),

        paddress (target_gdbarch, thread_local_base));

      return -1;

    }

  printf_filtered (_("Thread Information Block %s at %s\n"),

                   target_pid_to_str (ptid),

                   paddress (target_gdbarch, thread_local_base));

  index = (gdb_byte *) tib;

  /* All fields have the size of a pointer, this allows to iterate

     using the same for loop for both layouts.  */

  for (i = 0; i < max; i++)

    {

      val = extract_unsigned_integer (index, size, byte_order);

      if (i < max_name)

        printf_filtered (_("%s is 0x%s\n"), TIB_NAME[i], phex (val, size));

      else if (val != 0)

        printf_filtered (_("TIB[0x%s] is 0x%s\n"), phex (i * size, 2),

                         phex (val, size));

      index += size;

    }

  return 1;

}

/* Display thread information block of a thread specified by ARGS.

   If ARGS is empty, display thread information block of current_thread

   if current_thread is non NULL.

   Otherwise ARGS is parsed and converted to a integer that should

   be the windows ThreadID (not the internal GDB thread ID).  */

static void

display_tib (char * args, int from_tty)

{

  if (args)

    {

      struct thread_info *tp;

      int gdb_id = value_as_long (parse_and_eval (args));

      tp = find_thread_id (gdb_id);

      if (!tp)

        error (_("Thread ID %d not known."), gdb_id);

      if (!target_thread_alive (tp->ptid))

        error (_("Thread ID %d has terminated."), gdb_id);

      display_one_tib (tp->ptid);

    }

  else if (!ptid_equal (inferior_ptid, null_ptid))

    display_one_tib (inferior_ptid);

}

void

windows_xfer_shared_library (const char* so_name, CORE_ADDR load_addr,

                             struct gdbarch *gdbarch, struct obstack *obstack)

{

  char *p;

  obstack_grow_str (obstack, "<library name=\"");

  p = xml_escape_text (so_name);

  obstack_grow_str (obstack, p);

  xfree (p);

  obstack_grow_str (obstack, "\"><segment address=\"");

  /* The symbols in a dll are offset by 0x1000, which is the the

     offset from 0 of the first byte in an image - because of the file

     header and the section alignment. */

  obstack_grow_str (obstack, paddress (gdbarch, load_addr + 0x1000));

  obstack_grow_str (obstack, "\"/></library>");

}

static void

show_maint_show_all_tib (struct ui_file *file, int from_tty,

                struct cmd_list_element *c, const char *value)

{

  fprintf_filtered (file, _("Show all non-zero elements of Thread Information \

Block is %s.\n"), value);

}

static void

info_w32_command (char *args, int from_tty)

{

  help_list (info_w32_cmdlist, "info w32 ", class_info, gdb_stdout);

}

static int w32_prefix_command_valid = 0;

void

init_w32_command_list (void)

{

  if (!w32_prefix_command_valid)

    {

      add_prefix_cmd ("w32", class_info, info_w32_command,

                      _("Print information specific to Win32 debugging."),

                      &info_w32_cmdlist, "info w32 ", 0, &infolist);

      w32_prefix_command_valid = 1;

    }

}

void

_initialize_windows_tdep (void)

{

  init_w32_command_list ();

  add_cmd ("thread-information-block", class_info, display_tib,

           _("Display thread information block."),

           &info_w32_cmdlist);

  add_alias_cmd ("tib", "thread-information-block", class_info, 1,

                 &info_w32_cmdlist);

  add_setshow_boolean_cmd ("show-all-tib", class_maintenance,

                           &maint_display_all_tib, _("\

Set whether to display all non-zero fields of thread information block."), _("\

Show whether to display all non-zero fields of thread information block."), _("\

Use \"on\" to enable, \"off\" to disable.\n\

If enabled, all non-zero fields of thread information block are displayed,\n\

even if their meaning is unknown."),

                           NULL,

                           show_maint_show_all_tib,

                           &maintenance_set_cmdlist,

                           &maintenance_show_cmdlist);

  /* Explicitly create without lookup, since that tries to create a

     value with a void typed value, and when we get here, gdbarch

     isn't initialized yet.  At this point, we're quite sure there

     isn't another convenience variable of the same name.  */

  create_internalvar_type_lazy ("_tlb", tlb_make_value);

}