X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fwindows-nat.c;h=d04dc06f3bf7cd7bfd31f0addff2827f0af05729;hb=e758e19c596f8d0683f6c8ca750eb4e79071523d;hp=c4fde913af33bae7affd26a6ecc16362a02f8a1a;hpb=491144b5e21bbfd41969c175aebb663976f59058;p=deliverable%2Fbinutils-gdb.git

diff --git a/gdb/windows-nat.c b/gdb/windows-nat.c
index c4fde913af..d04dc06f3b 100644
--- a/gdb/windows-nat.c
+++ b/gdb/windows-nat.c
@@ -1,6 +1,6 @@
 /* Target-vector operations for controlling windows child processes, for GDB.
 
-   Copyright (C) 1995-2019 Free Software Foundation, Inc.
+   Copyright (C) 1995-2020 Free Software Foundation, Inc.
 
    Contributed by Cygnus Solutions, A Red Hat Company.
 
@@ -43,8 +43,8 @@
 #include <cygwin/version.h>
 #endif
 #include <algorithm>
+#include <vector>
 
-#include "buildsym-legacy.h"
 #include "filenames.h"
 #include "symfile.h"
 #include "objfiles.h"
@@ -69,17 +69,26 @@
 #include "inf-child.h"
 #include "gdbsupport/gdb_tilde_expand.h"
 #include "gdbsupport/pathstuff.h"
+#include "gdbsupport/gdb_wait.h"
+#include "nat/windows-nat.h"
+
+using namespace windows_nat;
 
 #define AdjustTokenPrivileges		dyn_AdjustTokenPrivileges
 #define DebugActiveProcessStop		dyn_DebugActiveProcessStop
 #define DebugBreakProcess		dyn_DebugBreakProcess
 #define DebugSetProcessKillOnExit	dyn_DebugSetProcessKillOnExit
 #define EnumProcessModules		dyn_EnumProcessModules
+#define EnumProcessModulesEx		dyn_EnumProcessModulesEx
 #define GetModuleInformation		dyn_GetModuleInformation
 #define LookupPrivilegeValueA		dyn_LookupPrivilegeValueA
 #define OpenProcessToken		dyn_OpenProcessToken
 #define GetConsoleFontSize		dyn_GetConsoleFontSize
 #define GetCurrentConsoleFont		dyn_GetCurrentConsoleFont
+#define Wow64SuspendThread		dyn_Wow64SuspendThread
+#define Wow64GetThreadContext		dyn_Wow64GetThreadContext
+#define Wow64SetThreadContext		dyn_Wow64SetThreadContext
+#define Wow64GetThreadSelectorEntry	dyn_Wow64GetThreadSelectorEntry
 
 typedef BOOL WINAPI (AdjustTokenPrivileges_ftype) (HANDLE, BOOL,
 						   PTOKEN_PRIVILEGES,
@@ -100,6 +109,12 @@ typedef BOOL WINAPI (EnumProcessModules_ftype) (HANDLE, HMODULE *, DWORD,
 						LPDWORD);
 static EnumProcessModules_ftype *EnumProcessModules;
 
+#ifdef __x86_64__
+typedef BOOL WINAPI (EnumProcessModulesEx_ftype) (HANDLE, HMODULE *, DWORD,
+						  LPDWORD, DWORD);
+static EnumProcessModulesEx_ftype *EnumProcessModulesEx;
+#endif
+
 typedef BOOL WINAPI (GetModuleInformation_ftype) (HANDLE, HMODULE,
 						  LPMODULEINFO, DWORD);
 static GetModuleInformation_ftype *GetModuleInformation;
@@ -117,6 +132,22 @@ static GetCurrentConsoleFont_ftype *GetCurrentConsoleFont;
 typedef COORD WINAPI (GetConsoleFontSize_ftype) (HANDLE, DWORD);
 static GetConsoleFontSize_ftype *GetConsoleFontSize;
 
+#ifdef __x86_64__
+typedef DWORD WINAPI (Wow64SuspendThread_ftype) (HANDLE);
+static Wow64SuspendThread_ftype *Wow64SuspendThread;
+
+typedef BOOL WINAPI (Wow64GetThreadContext_ftype) (HANDLE, PWOW64_CONTEXT);
+static Wow64GetThreadContext_ftype *Wow64GetThreadContext;
+
+typedef BOOL WINAPI (Wow64SetThreadContext_ftype) (HANDLE,
+						   const WOW64_CONTEXT *);
+static Wow64SetThreadContext_ftype *Wow64SetThreadContext;
+
+typedef BOOL WINAPI (Wow64GetThreadSelectorEntry_ftype) (HANDLE, DWORD,
+							 PLDT_ENTRY);
+static Wow64GetThreadSelectorEntry_ftype *Wow64GetThreadSelectorEntry;
+#endif
+
 #undef STARTUPINFO
 #undef CreateProcess
 #undef GetModuleFileNameEx
@@ -148,7 +179,7 @@ static GetConsoleFontSize_ftype *GetConsoleFontSize;
 static int have_saved_context;	/* True if we've saved context from a
 				   cygwin signal.  */
 #ifdef __CYGWIN__
-static CONTEXT saved_context;	/* Containes the saved context from a
+static CONTEXT saved_context;	/* Contains the saved context from a
 				   cygwin signal.  */
 #endif
 
@@ -179,19 +210,6 @@ static int debug_registers_used;
 static int windows_initialization_done;
 #define DR6_CLEAR_VALUE 0xffff0ff0
 
-/* The exception thrown by a program to tell the debugger the name of
-   a thread.  The exception record contains an ID of a thread and a
-   name to give it.  This exception has no documented name, but MSDN
-   dubs it "MS_VC_EXCEPTION" in one code example.  */
-#define MS_VC_EXCEPTION 0x406d1388
-
-typedef enum
-{
-  HANDLE_EXCEPTION_UNHANDLED = 0,
-  HANDLE_EXCEPTION_HANDLED,
-  HANDLE_EXCEPTION_IGNORED
-} handle_exception_result;
-
 /* The string sent by cygwin when it processes a signal.
    FIXME: This should be in a cygwin include file.  */
 #ifndef _CYGWIN_SIGNAL_STRING
@@ -210,39 +228,15 @@ static CORE_ADDR cygwin_get_dr (int i);
 static unsigned long cygwin_get_dr6 (void);
 static unsigned long cygwin_get_dr7 (void);
 
-static enum gdb_signal last_sig = GDB_SIGNAL_0;
-/* Set if a signal was received from the debugged process.  */
-
-/* Thread information structure used to track information that is
-   not available in gdb's thread structure.  */
-typedef struct windows_thread_info_struct
-  {
-    struct windows_thread_info_struct *next;
-    DWORD id;
-    HANDLE h;
-    CORE_ADDR thread_local_base;
-    char *name;
-    int suspended;
-    int reload_context;
-    CONTEXT context;
-    STACKFRAME sf;
-  }
-windows_thread_info;
-
-static windows_thread_info thread_head;
-
-/* The process and thread handles for the above context.  */
-
-static DEBUG_EVENT current_event;	/* The current debug event from
-					   WaitForDebugEvent */
-static HANDLE current_process_handle;	/* Currently executing process */
-static windows_thread_info *current_thread;	/* Info on currently selected thread */
+static std::vector<windows_thread_info *> thread_list;
 
 /* Counts of things.  */
-static int exception_count = 0;
-static int event_count = 0;
 static int saw_create;
 static int open_process_used = 0;
+#ifdef __x86_64__
+static bool wow64_process = false;
+static bool ignore_first_breakpoint = false;
+#endif
 
 /* User options.  */
 static bool new_console = false;
@@ -322,6 +316,16 @@ struct windows_nat_target final : public x86_nat_target<inf_child_target>
   void fetch_registers (struct regcache *, int) override;
   void store_registers (struct regcache *, int) override;
 
+  bool stopped_by_sw_breakpoint () override
+  {
+    return current_windows_thread->stopped_at_software_breakpoint;
+  }
+
+  bool supports_stopped_by_sw_breakpoint () override
+  {
+    return true;
+  }
+
   enum target_xfer_status xfer_partial (enum target_object object,
 					const char *annex,
 					gdb_byte *readbuf,
@@ -351,6 +355,8 @@ struct windows_nat_target final : public x86_nat_target<inf_child_target>
   bool get_tib_address (ptid_t ptid, CORE_ADDR *addr) override;
 
   const char *thread_name (struct thread_info *) override;
+
+  int get_windows_debug_event (int pid, struct target_waitstatus *ourstatus);
 };
 
 static windows_nat_target the_windows_nat_target;
@@ -358,15 +364,16 @@ static windows_nat_target the_windows_nat_target;
 /* Set the MAPPINGS static global to OFFSETS.
    See the description of MAPPINGS for more details.  */
 
-void
+static void
 windows_set_context_register_offsets (const int *offsets)
 {
   mappings = offsets;
 }
 
-/* See windows-nat.h.  */
+/* Set the function that should be used by this module to determine
+   whether a given register is a segment register or not.  */
 
-void
+static void
 windows_set_segment_register_p (segment_register_p_ftype *fun)
 {
   segment_register_p = fun;
@@ -380,44 +387,31 @@ check (BOOL ok, const char *file, int line)
 		     (unsigned) GetLastError ());
 }
 
-/* Find a thread record given a thread id.  If GET_CONTEXT is not 0,
-   then also retrieve the context for this thread.  If GET_CONTEXT is
-   negative, then don't suspend the thread.  */
-static windows_thread_info *
-thread_rec (DWORD id, int get_context)
-{
-  windows_thread_info *th;
+/* See nat/windows-nat.h.  */
 
-  for (th = &thread_head; (th = th->next) != NULL;)
-    if (th->id == id)
+windows_thread_info *
+windows_nat::thread_rec (ptid_t ptid, thread_disposition_type disposition)
+{
+  for (windows_thread_info *th : thread_list)
+    if (th->tid == ptid.lwp ())
       {
-	if (!th->suspended && get_context)
+	if (!th->suspended)
 	  {
-	    if (get_context > 0 && id != current_event.dwThreadId)
+	    switch (disposition)
 	      {
-		if (SuspendThread (th->h) == (DWORD) -1)
-		  {
-		    DWORD err = GetLastError ();
-
-		    /* We get Access Denied (5) when trying to suspend
-		       threads that Windows started on behalf of the
-		       debuggee, usually when those threads are just
-		       about to exit.
-		       We can get Invalid Handle (6) if the main thread
-		       has exited.  */
-		    if (err != ERROR_INVALID_HANDLE
-			&& err != ERROR_ACCESS_DENIED)
-		      warning (_("SuspendThread (tid=0x%x) failed."
-				 " (winerr %u)"),
-			       (unsigned) id, (unsigned) err);
-		    th->suspended = -1;
-		  }
-		else
-		  th->suspended = 1;
+	      case DONT_INVALIDATE_CONTEXT:
+		/* Nothing.  */
+		break;
+	      case INVALIDATE_CONTEXT:
+		if (ptid.lwp () != current_event.dwThreadId)
+		  th->suspend ();
+		th->reload_context = true;
+		break;
+	      case DONT_SUSPEND:
+		th->reload_context = true;
+		th->suspended = -1;
+		break;
 	      }
-	    else if (get_context < 0)
-	      th->suspended = -1;
-	    th->reload_context = 1;
 	  }
 	return th;
       }
@@ -437,21 +431,21 @@ static windows_thread_info *
 windows_add_thread (ptid_t ptid, HANDLE h, void *tlb, bool main_thread_p)
 {
   windows_thread_info *th;
-  DWORD id;
-
-  gdb_assert (ptid.tid () != 0);
 
-  id = ptid.tid ();
+  gdb_assert (ptid.lwp () != 0);
 
-  if ((th = thread_rec (id, FALSE)))
+  if ((th = thread_rec (ptid, DONT_INVALIDATE_CONTEXT)))
     return th;
 
-  th = XCNEW (windows_thread_info);
-  th->id = id;
-  th->h = h;
-  th->thread_local_base = (CORE_ADDR) (uintptr_t) tlb;
-  th->next = thread_head.next;
-  thread_head.next = th;
+  CORE_ADDR base = (CORE_ADDR) (uintptr_t) tlb;
+#ifdef __x86_64__
+  /* For WOW64 processes, this is actually the pointer to the 64bit TIB,
+     and the 32bit TIB is exactly 2 pages after it.  */
+  if (wow64_process)
+    base += 0x2000;
+#endif
+  th = new windows_thread_info (ptid.lwp (), h, base);
+  thread_list.push_back (th);
 
   /* Add this new thread to the list of threads.
 
@@ -459,24 +453,43 @@ windows_add_thread (ptid_t ptid, HANDLE h, void *tlb, bool main_thread_p)
      the main thread silently (in reality, this thread is really
      more of a process to the user than a thread).  */
   if (main_thread_p)
-    add_thread_silent (ptid);
+    add_thread_silent (&the_windows_nat_target, ptid);
   else
-    add_thread (ptid);
+    add_thread (&the_windows_nat_target, ptid);
 
   /* Set the debug registers for the new thread if they are used.  */
   if (debug_registers_used)
     {
-      /* Only change the value of the debug registers.  */
-      th->context.ContextFlags = CONTEXT_DEBUG_REGISTERS;
-      CHECK (GetThreadContext (th->h, &th->context));
-      th->context.Dr0 = dr[0];
-      th->context.Dr1 = dr[1];
-      th->context.Dr2 = dr[2];
-      th->context.Dr3 = dr[3];
-      th->context.Dr6 = DR6_CLEAR_VALUE;
-      th->context.Dr7 = dr[7];
-      CHECK (SetThreadContext (th->h, &th->context));
-      th->context.ContextFlags = 0;
+#ifdef __x86_64__
+      if (wow64_process)
+	{
+	  /* Only change the value of the debug registers.  */
+	  th->wow64_context.ContextFlags = CONTEXT_DEBUG_REGISTERS;
+	  CHECK (Wow64GetThreadContext (th->h, &th->wow64_context));
+	  th->wow64_context.Dr0 = dr[0];
+	  th->wow64_context.Dr1 = dr[1];
+	  th->wow64_context.Dr2 = dr[2];
+	  th->wow64_context.Dr3 = dr[3];
+	  th->wow64_context.Dr6 = DR6_CLEAR_VALUE;
+	  th->wow64_context.Dr7 = dr[7];
+	  CHECK (Wow64SetThreadContext (th->h, &th->wow64_context));
+	  th->wow64_context.ContextFlags = 0;
+	}
+      else
+#endif
+	{
+	  /* Only change the value of the debug registers.  */
+	  th->context.ContextFlags = CONTEXT_DEBUG_REGISTERS;
+	  CHECK (GetThreadContext (th->h, &th->context));
+	  th->context.Dr0 = dr[0];
+	  th->context.Dr1 = dr[1];
+	  th->context.Dr2 = dr[2];
+	  th->context.Dr3 = dr[3];
+	  th->context.Dr6 = DR6_CLEAR_VALUE;
+	  th->context.Dr7 = dr[7];
+	  CHECK (SetThreadContext (th->h, &th->context));
+	  th->context.ContextFlags = 0;
+	}
     }
   return th;
 }
@@ -486,17 +499,13 @@ windows_add_thread (ptid_t ptid, HANDLE h, void *tlb, bool main_thread_p)
 static void
 windows_init_thread_list (void)
 {
-  windows_thread_info *th = &thread_head;
-
   DEBUG_EVENTS (("gdb: windows_init_thread_list\n"));
   init_thread_list ();
-  while (th->next != NULL)
-    {
-      windows_thread_info *here = th->next;
-      th->next = here->next;
-      xfree (here);
-    }
-  thread_head.next = NULL;
+
+  for (windows_thread_info *here : thread_list)
+    delete here;
+
+  thread_list.clear ();
 }
 
 /* Delete a thread from the list of threads.
@@ -509,18 +518,17 @@ windows_init_thread_list (void)
 static void
 windows_delete_thread (ptid_t ptid, DWORD exit_code, bool main_thread_p)
 {
-  windows_thread_info *th;
   DWORD id;
 
-  gdb_assert (ptid.tid () != 0);
+  gdb_assert (ptid.lwp () != 0);
 
-  id = ptid.tid ();
+  id = ptid.lwp ();
 
   /* Emit a notification about the thread being deleted.
 
      Note that no notification was printed when the main thread
      was created, and thus, unless in verbose mode, we should be
-     symetrical, and avoid that notification for the main thread
+     symmetrical, and avoid that notification for the main thread
      here as well.  */
 
   if (info_verbose)
@@ -530,19 +538,18 @@ windows_delete_thread (ptid_t ptid, DWORD exit_code, bool main_thread_p)
 		       target_pid_to_str (ptid).c_str (),
 		       (unsigned) exit_code);
 
-  delete_thread (find_thread_ptid (ptid));
+  delete_thread (find_thread_ptid (&the_windows_nat_target, ptid));
 
-  for (th = &thread_head;
-       th->next != NULL && th->next->id != id;
-       th = th->next)
-    continue;
+  auto iter = std::find_if (thread_list.begin (), thread_list.end (),
+			    [=] (windows_thread_info *th)
+			    {
+			      return th->tid == id;
+			    });
 
-  if (th->next != NULL)
+  if (iter != thread_list.end ())
     {
-      windows_thread_info *here = th->next;
-      th->next = here->next;
-      xfree (here->name);
-      xfree (here);
+      delete *iter;
+      thread_list.erase (iter);
     }
 }
 
@@ -563,10 +570,20 @@ windows_fetch_one_register (struct regcache *regcache,
   gdb_assert (r >= 0);
   gdb_assert (!th->reload_context);
 
-  char *context_offset = ((char *) &th->context) + mappings[r];
+  char *context_ptr = (char *) &th->context;
+#ifdef __x86_64__
+  if (wow64_process)
+    context_ptr = (char *) &th->wow64_context;
+#endif
+
+  char *context_offset = context_ptr + mappings[r];
   struct gdbarch *gdbarch = regcache->arch ();
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
+  gdb_assert (!gdbarch_read_pc_p (gdbarch));
+  gdb_assert (gdbarch_pc_regnum (gdbarch) >= 0);
+  gdb_assert (!gdbarch_write_pc_p (gdbarch));
+
   if (r == I387_FISEG_REGNUM (tdep))
     {
       long l = *((long *) context_offset) & 0xffff;
@@ -586,14 +603,35 @@ windows_fetch_one_register (struct regcache *regcache,
       regcache->raw_supply (r, (char *) &l);
     }
   else
-    regcache->raw_supply (r, context_offset);
+    {
+      if (th->stopped_at_software_breakpoint
+	  && r == gdbarch_pc_regnum (gdbarch))
+	{
+	  int size = register_size (gdbarch, r);
+	  if (size == 4)
+	    {
+	      uint32_t value;
+	      memcpy (&value, context_offset, size);
+	      value -= gdbarch_decr_pc_after_break (gdbarch);
+	      memcpy (context_offset, &value, size);
+	    }
+	  else
+	    {
+	      gdb_assert (size == 8);
+	      uint64_t value;
+	      memcpy (&value, context_offset, size);
+	      value -= gdbarch_decr_pc_after_break (gdbarch);
+	      memcpy (context_offset, &value, size);
+	    }
+	}
+      regcache->raw_supply (r, context_offset);
+    }
 }
 
 void
 windows_nat_target::fetch_registers (struct regcache *regcache, int r)
 {
-  DWORD pid = regcache->ptid ().tid ();
-  windows_thread_info *th = thread_rec (pid, TRUE);
+  windows_thread_info *th = thread_rec (regcache->ptid (), INVALIDATE_CONTEXT);
 
   /* Check if TH exists.  Windows sometimes uses a non-existent
      thread id in its events.  */
@@ -614,6 +652,26 @@ windows_nat_target::fetch_registers (struct regcache *regcache, int r)
 	  have_saved_context = 0;
 	}
       else
+#endif
+#ifdef __x86_64__
+      if (wow64_process)
+	{
+	  th->wow64_context.ContextFlags = CONTEXT_DEBUGGER_DR;
+	  CHECK (Wow64GetThreadContext (th->h, &th->wow64_context));
+	  /* Copy dr values from that thread.
+	     But only if there were not modified since last stop.
+	     PR gdb/2388 */
+	  if (!debug_registers_changed)
+	    {
+	      dr[0] = th->wow64_context.Dr0;
+	      dr[1] = th->wow64_context.Dr1;
+	      dr[2] = th->wow64_context.Dr2;
+	      dr[3] = th->wow64_context.Dr3;
+	      dr[6] = th->wow64_context.Dr6;
+	      dr[7] = th->wow64_context.Dr7;
+	    }
+	}
+      else
 #endif
 	{
 	  th->context.ContextFlags = CONTEXT_DEBUGGER_DR;
@@ -631,7 +689,7 @@ windows_nat_target::fetch_registers (struct regcache *regcache, int r)
 	      dr[7] = th->context.Dr7;
 	    }
 	}
-      th->reload_context = 0;
+      th->reload_context = false;
     }
 
   if (r < 0)
@@ -653,7 +711,13 @@ windows_store_one_register (const struct regcache *regcache,
 {
   gdb_assert (r >= 0);
 
-  regcache->raw_collect (r, ((char *) &th->context) + mappings[r]);
+  char *context_ptr = (char *) &th->context;
+#ifdef __x86_64__
+  if (wow64_process)
+    context_ptr = (char *) &th->wow64_context;
+#endif
+
+  regcache->raw_collect (r, context_ptr + mappings[r]);
 }
 
 /* Store a new register value into the context of the thread tied to
@@ -662,8 +726,7 @@ windows_store_one_register (const struct regcache *regcache,
 void
 windows_nat_target::store_registers (struct regcache *regcache, int r)
 {
-  DWORD pid = regcache->ptid ().tid ();
-  windows_thread_info *th = thread_rec (pid, TRUE);
+  windows_thread_info *th = thread_rec (regcache->ptid (), INVALIDATE_CONTEXT);
 
   /* Check if TH exists.  Windows sometimes uses a non-existent
      thread id in its events.  */
@@ -677,23 +740,11 @@ windows_nat_target::store_registers (struct regcache *regcache, int r)
     windows_store_one_register (regcache, th, r);
 }
 
-/* Encapsulate the information required in a call to
-   symbol_file_add_args.  */
-struct safe_symbol_file_add_args
-{
-  char *name;
-  int from_tty;
-  section_addr_info *addrs;
-  int mainline;
-  int flags;
-  struct ui_file *err, *out;
-  struct objfile *ret;
-};
-
 /* Maintain a linked list of "so" information.  */
 struct lm_info_windows : public lm_info_base
 {
   LPVOID load_addr = 0;
+  CORE_ADDR text_offset = 0;
 };
 
 static struct so_list solib_start, *solib_end;
@@ -794,76 +845,20 @@ windows_make_so (const char *name, LPVOID load_addr)
 	 file header and the section alignment.  */
       cygwin_load_start = (CORE_ADDR) (uintptr_t) ((char *)
 						   load_addr + 0x1000);
-      cygwin_load_end = cygwin_load_start + bfd_section_size (abfd.get (),
-							      text);
+      cygwin_load_end = cygwin_load_start + bfd_section_size (text);
     }
 #endif
 
   return so;
 }
 
-static char *
-get_image_name (HANDLE h, void *address, int unicode)
-{
-#ifdef __CYGWIN__
-  static char buf[__PMAX];
-#else
-  static char buf[(2 * __PMAX) + 1];
-#endif
-  DWORD size = unicode ? sizeof (WCHAR) : sizeof (char);
-  char *address_ptr;
-  int len = 0;
-  char b[2];
-  SIZE_T done;
-
-  /* Attempt to read the name of the dll that was detected.
-     This is documented to work only when actively debugging
-     a program.  It will not work for attached processes.  */
-  if (address == NULL)
-    return NULL;
-
-  /* See if we could read the address of a string, and that the
-     address isn't null.  */
-  if (!ReadProcessMemory (h, address,  &address_ptr,
-			  sizeof (address_ptr), &done)
-      || done != sizeof (address_ptr) || !address_ptr)
-    return NULL;
-
-  /* Find the length of the string.  */
-  while (ReadProcessMemory (h, address_ptr + len++ * size, &b, size, &done)
-	 && (b[0] != 0 || b[size - 1] != 0) && done == size)
-    continue;
-
-  if (!unicode)
-    ReadProcessMemory (h, address_ptr, buf, len, &done);
-  else
-    {
-      WCHAR *unicode_address = (WCHAR *) alloca (len * sizeof (WCHAR));
-      ReadProcessMemory (h, address_ptr, unicode_address, len * sizeof (WCHAR),
-			 &done);
-#ifdef __CYGWIN__
-      wcstombs (buf, unicode_address, __PMAX);
-#else
-      WideCharToMultiByte (CP_ACP, 0, unicode_address, len, buf, sizeof buf,
-			   0, 0);
-#endif
-    }
+/* See nat/windows-nat.h.  */
 
-  return buf;
-}
-
-/* Handle a DLL load event, and return 1.
-
-   This function assumes that this event did not occur during inferior
-   initialization, where their event info may be incomplete (see
-   do_initial_windows_stuff and windows_add_all_dlls for more info
-   on how we handle DLL loading during that phase).  */
-
-static void
-handle_load_dll ()
+void
+windows_nat::handle_load_dll ()
 {
   LOAD_DLL_DEBUG_INFO *event = &current_event.u.LoadDll;
-  char *dll_name;
+  const char *dll_name;
 
   /* Try getting the DLL name via the lpImageName field of the event.
      Note that Microsoft documents this fields as strictly optional,
@@ -893,16 +888,10 @@ windows_free_so (struct so_list *so)
   xfree (so);
 }
 
-/* Handle a DLL unload event.
-   Return 1 if successful, or zero otherwise.
-
-   This function assumes that this event did not occur during inferior
-   initialization, where their event info may be incomplete (see
-   do_initial_windows_stuff and windows_add_all_dlls for more info
-   on how we handle DLL loading during that phase).  */
+/* See nat/windows-nat.h.  */
 
-static void
-handle_unload_dll ()
+void
+windows_nat::handle_unload_dll ()
 {
   LPVOID lpBaseOfDll = current_event.u.UnloadDll.lpBaseOfDll;
   struct so_list *so;
@@ -956,7 +945,14 @@ catch_errors (void (*func) ())
 static void
 windows_clear_solib (void)
 {
-  solib_start.next = NULL;
+  struct so_list *so;
+
+  for (so = solib_start.next; so; so = solib_start.next)
+    {
+      solib_start.next = so->next;
+      windows_free_so (so);
+    }
+
   solib_end = &solib_start;
 }
 
@@ -979,11 +975,10 @@ signal_event_command (const char *args, int from_tty)
   CloseHandle ((HANDLE) event_id);
 }
 
-/* Handle DEBUG_STRING output from child process.
-   Cygwin prepends its messages with a "cygwin:".  Interpret this as
-   a Cygwin signal.  Otherwise just print the string as a warning.  */
-static int
-handle_output_debug_string (struct target_waitstatus *ourstatus)
+/* See nat/windows-nat.h.  */
+
+int
+windows_nat::handle_output_debug_string (struct target_waitstatus *ourstatus)
 {
   gdb::unique_xmalloc_ptr<char> s;
   int retval = 0;
@@ -1047,7 +1042,14 @@ static int
 display_selector (HANDLE thread, DWORD sel)
 {
   LDT_ENTRY info;
-  if (GetThreadSelectorEntry (thread, sel, &info))
+  BOOL ret;
+#ifdef __x86_64__
+  if (wow64_process)
+    ret = Wow64GetThreadSelectorEntry (thread, sel, &info);
+  else
+#endif
+    ret = GetThreadSelectorEntry (thread, sel, &info);
+  if (ret)
     {
       int base, limit;
       printf_filtered ("0x%03x: ", (unsigned) sel);
@@ -1124,208 +1126,106 @@ display_selector (HANDLE thread, DWORD sel)
 static void
 display_selectors (const char * args, int from_tty)
 {
-  if (!current_thread)
+  if (!current_windows_thread)
     {
       puts_filtered ("Impossible to display selectors now.\n");
       return;
     }
   if (!args)
     {
-
-      puts_filtered ("Selector $cs\n");
-      display_selector (current_thread->h,
-	current_thread->context.SegCs);
-      puts_filtered ("Selector $ds\n");
-      display_selector (current_thread->h,
-	current_thread->context.SegDs);
-      puts_filtered ("Selector $es\n");
-      display_selector (current_thread->h,
-	current_thread->context.SegEs);
-      puts_filtered ("Selector $ss\n");
-      display_selector (current_thread->h,
-	current_thread->context.SegSs);
-      puts_filtered ("Selector $fs\n");
-      display_selector (current_thread->h,
-	current_thread->context.SegFs);
-      puts_filtered ("Selector $gs\n");
-      display_selector (current_thread->h,
-	current_thread->context.SegGs);
+#ifdef __x86_64__
+      if (wow64_process)
+	{
+	  puts_filtered ("Selector $cs\n");
+	  display_selector (current_windows_thread->h,
+			    current_windows_thread->wow64_context.SegCs);
+	  puts_filtered ("Selector $ds\n");
+	  display_selector (current_windows_thread->h,
+			    current_windows_thread->wow64_context.SegDs);
+	  puts_filtered ("Selector $es\n");
+	  display_selector (current_windows_thread->h,
+			    current_windows_thread->wow64_context.SegEs);
+	  puts_filtered ("Selector $ss\n");
+	  display_selector (current_windows_thread->h,
+			    current_windows_thread->wow64_context.SegSs);
+	  puts_filtered ("Selector $fs\n");
+	  display_selector (current_windows_thread->h,
+			    current_windows_thread->wow64_context.SegFs);
+	  puts_filtered ("Selector $gs\n");
+	  display_selector (current_windows_thread->h,
+			    current_windows_thread->wow64_context.SegGs);
+	}
+      else
+#endif
+	{
+	  puts_filtered ("Selector $cs\n");
+	  display_selector (current_windows_thread->h,
+			    current_windows_thread->context.SegCs);
+	  puts_filtered ("Selector $ds\n");
+	  display_selector (current_windows_thread->h,
+			    current_windows_thread->context.SegDs);
+	  puts_filtered ("Selector $es\n");
+	  display_selector (current_windows_thread->h,
+			    current_windows_thread->context.SegEs);
+	  puts_filtered ("Selector $ss\n");
+	  display_selector (current_windows_thread->h,
+			    current_windows_thread->context.SegSs);
+	  puts_filtered ("Selector $fs\n");
+	  display_selector (current_windows_thread->h,
+			    current_windows_thread->context.SegFs);
+	  puts_filtered ("Selector $gs\n");
+	  display_selector (current_windows_thread->h,
+			    current_windows_thread->context.SegGs);
+	}
     }
   else
     {
       int sel;
       sel = parse_and_eval_long (args);
       printf_filtered ("Selector \"%s\"\n",args);
-      display_selector (current_thread->h, sel);
+      display_selector (current_windows_thread->h, sel);
     }
 }
 
-#define DEBUG_EXCEPTION_SIMPLE(x)       if (debug_exceptions) \
-  printf_unfiltered ("gdb: Target exception %s at %s\n", x, \
-    host_address_to_string (\
-      current_event.u.Exception.ExceptionRecord.ExceptionAddress))
+/* See nat/windows-nat.h.  */
 
-static handle_exception_result
-handle_exception (struct target_waitstatus *ourstatus)
+bool
+windows_nat::handle_ms_vc_exception (const EXCEPTION_RECORD *rec)
 {
-  EXCEPTION_RECORD *rec = &current_event.u.Exception.ExceptionRecord;
-  DWORD code = rec->ExceptionCode;
-  handle_exception_result result = HANDLE_EXCEPTION_HANDLED;
-
-  ourstatus->kind = TARGET_WAITKIND_STOPPED;
-
-  /* Record the context of the current thread.  */
-  thread_rec (current_event.dwThreadId, -1);
-
-  switch (code)
+  if (rec->NumberParameters >= 3
+      && (rec->ExceptionInformation[0] & 0xffffffff) == 0x1000)
     {
-    case EXCEPTION_ACCESS_VIOLATION:
-      DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ACCESS_VIOLATION");
-      ourstatus->value.sig = GDB_SIGNAL_SEGV;
-#ifdef __CYGWIN__
-      {
-	/* See if the access violation happened within the cygwin DLL
-	   itself.  Cygwin uses a kind of exception handling to deal
-	   with passed-in invalid addresses.  gdb should not treat
-	   these as real SEGVs since they will be silently handled by
-	   cygwin.  A real SEGV will (theoretically) be caught by
-	   cygwin later in the process and will be sent as a
-	   cygwin-specific-signal.  So, ignore SEGVs if they show up
-	   within the text segment of the DLL itself.  */
-	const char *fn;
-	CORE_ADDR addr = (CORE_ADDR) (uintptr_t) rec->ExceptionAddress;
-
-	if ((!cygwin_exceptions && (addr >= cygwin_load_start
-				    && addr < cygwin_load_end))
-	    || (find_pc_partial_function (addr, &fn, NULL, NULL)
-		&& startswith (fn, "KERNEL32!IsBad")))
-	  return HANDLE_EXCEPTION_UNHANDLED;
-      }
-#endif
-      break;
-    case STATUS_STACK_OVERFLOW:
-      DEBUG_EXCEPTION_SIMPLE ("STATUS_STACK_OVERFLOW");
-      ourstatus->value.sig = GDB_SIGNAL_SEGV;
-      break;
-    case STATUS_FLOAT_DENORMAL_OPERAND:
-      DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_DENORMAL_OPERAND");
-      ourstatus->value.sig = GDB_SIGNAL_FPE;
-      break;
-    case EXCEPTION_ARRAY_BOUNDS_EXCEEDED:
-      DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ARRAY_BOUNDS_EXCEEDED");
-      ourstatus->value.sig = GDB_SIGNAL_FPE;
-      break;
-    case STATUS_FLOAT_INEXACT_RESULT:
-      DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_INEXACT_RESULT");
-      ourstatus->value.sig = GDB_SIGNAL_FPE;
-      break;
-    case STATUS_FLOAT_INVALID_OPERATION:
-      DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_INVALID_OPERATION");
-      ourstatus->value.sig = GDB_SIGNAL_FPE;
-      break;
-    case STATUS_FLOAT_OVERFLOW:
-      DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_OVERFLOW");
-      ourstatus->value.sig = GDB_SIGNAL_FPE;
-      break;
-    case STATUS_FLOAT_STACK_CHECK:
-      DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_STACK_CHECK");
-      ourstatus->value.sig = GDB_SIGNAL_FPE;
-      break;
-    case STATUS_FLOAT_UNDERFLOW:
-      DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_UNDERFLOW");
-      ourstatus->value.sig = GDB_SIGNAL_FPE;
-      break;
-    case STATUS_FLOAT_DIVIDE_BY_ZERO:
-      DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_DIVIDE_BY_ZERO");
-      ourstatus->value.sig = GDB_SIGNAL_FPE;
-      break;
-    case STATUS_INTEGER_DIVIDE_BY_ZERO:
-      DEBUG_EXCEPTION_SIMPLE ("STATUS_INTEGER_DIVIDE_BY_ZERO");
-      ourstatus->value.sig = GDB_SIGNAL_FPE;
-      break;
-    case STATUS_INTEGER_OVERFLOW:
-      DEBUG_EXCEPTION_SIMPLE ("STATUS_INTEGER_OVERFLOW");
-      ourstatus->value.sig = GDB_SIGNAL_FPE;
-      break;
-    case EXCEPTION_BREAKPOINT:
-      DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_BREAKPOINT");
-      ourstatus->value.sig = GDB_SIGNAL_TRAP;
-      break;
-    case DBG_CONTROL_C:
-      DEBUG_EXCEPTION_SIMPLE ("DBG_CONTROL_C");
-      ourstatus->value.sig = GDB_SIGNAL_INT;
-      break;
-    case DBG_CONTROL_BREAK:
-      DEBUG_EXCEPTION_SIMPLE ("DBG_CONTROL_BREAK");
-      ourstatus->value.sig = GDB_SIGNAL_INT;
-      break;
-    case EXCEPTION_SINGLE_STEP:
-      DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_SINGLE_STEP");
-      ourstatus->value.sig = GDB_SIGNAL_TRAP;
-      break;
-    case EXCEPTION_ILLEGAL_INSTRUCTION:
-      DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ILLEGAL_INSTRUCTION");
-      ourstatus->value.sig = GDB_SIGNAL_ILL;
-      break;
-    case EXCEPTION_PRIV_INSTRUCTION:
-      DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_PRIV_INSTRUCTION");
-      ourstatus->value.sig = GDB_SIGNAL_ILL;
-      break;
-    case EXCEPTION_NONCONTINUABLE_EXCEPTION:
-      DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_NONCONTINUABLE_EXCEPTION");
-      ourstatus->value.sig = GDB_SIGNAL_ILL;
-      break;
-    case MS_VC_EXCEPTION:
-      if (rec->NumberParameters >= 3
-	  && (rec->ExceptionInformation[0] & 0xffffffff) == 0x1000)
-	{
-	  DWORD named_thread_id;
-	  windows_thread_info *named_thread;
-	  CORE_ADDR thread_name_target;
+      DWORD named_thread_id;
+      windows_thread_info *named_thread;
+      CORE_ADDR thread_name_target;
 
-	  DEBUG_EXCEPTION_SIMPLE ("MS_VC_EXCEPTION");
+      thread_name_target = rec->ExceptionInformation[1];
+      named_thread_id = (DWORD) (0xffffffff & rec->ExceptionInformation[2]);
 
-	  thread_name_target = rec->ExceptionInformation[1];
-	  named_thread_id = (DWORD) (0xffffffff & rec->ExceptionInformation[2]);
+      if (named_thread_id == (DWORD) -1)
+	named_thread_id = current_event.dwThreadId;
 
-	  if (named_thread_id == (DWORD) -1)
-	    named_thread_id = current_event.dwThreadId;
+      named_thread = thread_rec (ptid_t (current_event.dwProcessId,
+					 named_thread_id, 0),
+				 DONT_INVALIDATE_CONTEXT);
+      if (named_thread != NULL)
+	{
+	  int thread_name_len;
+	  gdb::unique_xmalloc_ptr<char> thread_name;
 
-	  named_thread = thread_rec (named_thread_id, 0);
-	  if (named_thread != NULL)
+	  thread_name_len = target_read_string (thread_name_target,
+						&thread_name, 1025, NULL);
+	  if (thread_name_len > 0)
 	    {
-	      int thread_name_len;
-	      gdb::unique_xmalloc_ptr<char> thread_name;
-
-	      thread_name_len = target_read_string (thread_name_target,
-						    &thread_name, 1025, NULL);
-	      if (thread_name_len > 0)
-		{
-		  thread_name.get ()[thread_name_len - 1] = '\0';
-		  xfree (named_thread->name);
-		  named_thread->name = thread_name.release ();
-		}
+	      thread_name.get ()[thread_name_len - 1] = '\0';
+	      named_thread->name = std::move (thread_name);
 	    }
-	  ourstatus->value.sig = GDB_SIGNAL_TRAP;
-	  result = HANDLE_EXCEPTION_IGNORED;
-	  break;
 	}
-	/* treat improperly formed exception as unknown */
-	/* FALLTHROUGH */
-    default:
-      /* Treat unhandled first chance exceptions specially.  */
-      if (current_event.u.Exception.dwFirstChance)
-	return HANDLE_EXCEPTION_UNHANDLED;
-      printf_unfiltered ("gdb: unknown target exception 0x%08x at %s\n",
-	(unsigned) current_event.u.Exception.ExceptionRecord.ExceptionCode,
-	host_address_to_string (
-	  current_event.u.Exception.ExceptionRecord.ExceptionAddress));
-      ourstatus->value.sig = GDB_SIGNAL_UNKNOWN;
-      break;
+
+      return true;
     }
-  exception_count++;
-  last_sig = ourstatus->value.sig;
-  return result;
+
+  return false;
 }
 
 /* Resume thread specified by ID, or all artificially suspended
@@ -1335,51 +1235,85 @@ handle_exception (struct target_waitstatus *ourstatus)
 static BOOL
 windows_continue (DWORD continue_status, int id, int killed)
 {
-  windows_thread_info *th;
   BOOL res;
 
-  DEBUG_EVENTS (("ContinueDebugEvent (cpid=%d, ctid=0x%x, %s);\n",
-		  (unsigned) current_event.dwProcessId,
-		  (unsigned) current_event.dwThreadId,
-		  continue_status == DBG_CONTINUE ?
-		  "DBG_CONTINUE" : "DBG_EXCEPTION_NOT_HANDLED"));
+  desired_stop_thread_id = id;
+
+  if (matching_pending_stop (debug_events))
+    return TRUE;
 
-  for (th = &thread_head; (th = th->next) != NULL;)
-    if ((id == -1 || id == (int) th->id)
-	&& th->suspended)
+  for (windows_thread_info *th : thread_list)
+    if (id == -1 || id == (int) th->tid)
       {
-	if (debug_registers_changed)
+	if (!th->suspended)
+	  continue;
+#ifdef __x86_64__
+	if (wow64_process)
 	  {
-	    th->context.ContextFlags |= CONTEXT_DEBUG_REGISTERS;
-	    th->context.Dr0 = dr[0];
-	    th->context.Dr1 = dr[1];
-	    th->context.Dr2 = dr[2];
-	    th->context.Dr3 = dr[3];
-	    th->context.Dr6 = DR6_CLEAR_VALUE;
-	    th->context.Dr7 = dr[7];
+	    if (debug_registers_changed)
+	      {
+		th->wow64_context.ContextFlags |= CONTEXT_DEBUG_REGISTERS;
+		th->wow64_context.Dr0 = dr[0];
+		th->wow64_context.Dr1 = dr[1];
+		th->wow64_context.Dr2 = dr[2];
+		th->wow64_context.Dr3 = dr[3];
+		th->wow64_context.Dr6 = DR6_CLEAR_VALUE;
+		th->wow64_context.Dr7 = dr[7];
+	      }
+	    if (th->wow64_context.ContextFlags)
+	      {
+		DWORD ec = 0;
+
+		if (GetExitCodeThread (th->h, &ec)
+		    && ec == STILL_ACTIVE)
+		  {
+		    BOOL status = Wow64SetThreadContext (th->h,
+							 &th->wow64_context);
+
+		    if (!killed)
+		      CHECK (status);
+		  }
+		th->wow64_context.ContextFlags = 0;
+	      }
 	  }
-	if (th->context.ContextFlags)
+	else
+#endif
 	  {
-	    DWORD ec = 0;
-
-	    if (GetExitCodeThread (th->h, &ec)
-		&& ec == STILL_ACTIVE)
+	    if (debug_registers_changed)
 	      {
-		BOOL status = SetThreadContext (th->h, &th->context);
+		th->context.ContextFlags |= CONTEXT_DEBUG_REGISTERS;
+		th->context.Dr0 = dr[0];
+		th->context.Dr1 = dr[1];
+		th->context.Dr2 = dr[2];
+		th->context.Dr3 = dr[3];
+		th->context.Dr6 = DR6_CLEAR_VALUE;
+		th->context.Dr7 = dr[7];
+	      }
+	    if (th->context.ContextFlags)
+	      {
+		DWORD ec = 0;
+
+		if (GetExitCodeThread (th->h, &ec)
+		    && ec == STILL_ACTIVE)
+		  {
+		    BOOL status = SetThreadContext (th->h, &th->context);
 
-		if (!killed)
-		  CHECK (status);
+		    if (!killed)
+		      CHECK (status);
+		  }
+		th->context.ContextFlags = 0;
 	      }
-	    th->context.ContextFlags = 0;
 	  }
-	if (th->suspended > 0)
-	  (void) ResumeThread (th->h);
-	th->suspended = 0;
+	th->resume ();
+      }
+    else
+      {
+	/* When single-stepping a specific thread, other threads must
+	   be suspended.  */
+	th->suspend ();
       }
 
-  res = ContinueDebugEvent (current_event.dwProcessId,
-			    current_event.dwThreadId,
-			    continue_status);
+  res = continue_last_debug_event (continue_status, debug_events);
 
   if (!res)
     error (_("Failed to resume program execution"
@@ -1405,9 +1339,9 @@ fake_create_process (void)
        (unsigned) GetLastError ());
       /*  We can not debug anything in that case.  */
     }
-  current_thread
-    = windows_add_thread (ptid_t (current_event.dwProcessId, 0,
-				  current_event.dwThreadId),
+  current_windows_thread
+    = windows_add_thread (ptid_t (current_event.dwProcessId,
+				  current_event.dwThreadId, 0),
 			  current_event.u.CreateThread.hThread,
 			  current_event.u.CreateThread.lpThreadLocalBase,
 			  true /* main_thread_p */);
@@ -1463,35 +1397,66 @@ windows_nat_target::resume (ptid_t ptid, int step, enum gdb_signal sig)
 
   last_sig = GDB_SIGNAL_0;
 
-  DEBUG_EXEC (("gdb: windows_resume (pid=%d, tid=%ld, step=%d, sig=%d);\n",
-	       ptid.pid (), ptid.tid (), step, sig));
+  DEBUG_EXEC (("gdb: windows_resume (pid=%d, tid=0x%x, step=%d, sig=%d);\n",
+	       ptid.pid (), (unsigned) ptid.lwp (), step, sig));
 
   /* Get context for currently selected thread.  */
-  th = thread_rec (inferior_ptid.tid (), FALSE);
+  th = thread_rec (inferior_ptid, DONT_INVALIDATE_CONTEXT);
   if (th)
     {
-      if (step)
+#ifdef __x86_64__
+      if (wow64_process)
 	{
-	  /* Single step by setting t bit.  */
-	  struct regcache *regcache = get_current_regcache ();
-	  struct gdbarch *gdbarch = regcache->arch ();
-	  fetch_registers (regcache, gdbarch_ps_regnum (gdbarch));
-	  th->context.EFlags |= FLAG_TRACE_BIT;
-	}
+	  if (step)
+	    {
+	      /* Single step by setting t bit.  */
+	      struct regcache *regcache = get_current_regcache ();
+	      struct gdbarch *gdbarch = regcache->arch ();
+	      fetch_registers (regcache, gdbarch_ps_regnum (gdbarch));
+	      th->wow64_context.EFlags |= FLAG_TRACE_BIT;
+	    }
 
-      if (th->context.ContextFlags)
+	  if (th->wow64_context.ContextFlags)
+	    {
+	      if (debug_registers_changed)
+		{
+		  th->wow64_context.Dr0 = dr[0];
+		  th->wow64_context.Dr1 = dr[1];
+		  th->wow64_context.Dr2 = dr[2];
+		  th->wow64_context.Dr3 = dr[3];
+		  th->wow64_context.Dr6 = DR6_CLEAR_VALUE;
+		  th->wow64_context.Dr7 = dr[7];
+		}
+	      CHECK (Wow64SetThreadContext (th->h, &th->wow64_context));
+	      th->wow64_context.ContextFlags = 0;
+	    }
+	}
+      else
+#endif
 	{
-	  if (debug_registers_changed)
+	  if (step)
 	    {
-	      th->context.Dr0 = dr[0];
-	      th->context.Dr1 = dr[1];
-	      th->context.Dr2 = dr[2];
-	      th->context.Dr3 = dr[3];
-	      th->context.Dr6 = DR6_CLEAR_VALUE;
-	      th->context.Dr7 = dr[7];
+	      /* Single step by setting t bit.  */
+	      struct regcache *regcache = get_current_regcache ();
+	      struct gdbarch *gdbarch = regcache->arch ();
+	      fetch_registers (regcache, gdbarch_ps_regnum (gdbarch));
+	      th->context.EFlags |= FLAG_TRACE_BIT;
+	    }
+
+	  if (th->context.ContextFlags)
+	    {
+	      if (debug_registers_changed)
+		{
+		  th->context.Dr0 = dr[0];
+		  th->context.Dr1 = dr[1];
+		  th->context.Dr2 = dr[2];
+		  th->context.Dr3 = dr[3];
+		  th->context.Dr6 = DR6_CLEAR_VALUE;
+		  th->context.Dr7 = dr[7];
+		}
+	      CHECK (SetThreadContext (th->h, &th->context));
+	      th->context.ContextFlags = 0;
 	    }
-	  CHECK (SetThreadContext (th->h, &th->context));
-	  th->context.ContextFlags = 0;
 	}
     }
 
@@ -1501,7 +1466,7 @@ windows_nat_target::resume (ptid_t ptid, int step, enum gdb_signal sig)
   if (resume_all)
     windows_continue (continue_status, -1, 0);
   else
-    windows_continue (continue_status, ptid.tid (), 0);
+    windows_continue (continue_status, ptid.lwp (), 0);
 }
 
 /* Ctrl-C handler used when the inferior is not run in the same console.  The
@@ -1530,24 +1495,63 @@ ctrl_c_handler (DWORD event_type)
   return TRUE;
 }
 
+/* A wrapper for WaitForDebugEvent that sets "last_wait_event"
+   appropriately.  */
+static BOOL
+wait_for_debug_event (DEBUG_EVENT *event, DWORD timeout)
+{
+  BOOL result = WaitForDebugEvent (event, timeout);
+  if (result)
+    last_wait_event = *event;
+  return result;
+}
+
 /* Get the next event from the child.  Returns a non-zero thread id if the event
    requires handling by WFI (or whatever).  */
-static int
-get_windows_debug_event (struct target_ops *ops,
-			 int pid, struct target_waitstatus *ourstatus)
+
+int
+windows_nat_target::get_windows_debug_event (int pid,
+					     struct target_waitstatus *ourstatus)
 {
   BOOL debug_event;
   DWORD continue_status, event_code;
   windows_thread_info *th;
-  static windows_thread_info dummy_thread_info;
+  static windows_thread_info dummy_thread_info (0, 0, 0);
   DWORD thread_id = 0;
 
+  /* If there is a relevant pending stop, report it now.  See the
+     comment by the definition of "pending_stops" for details on why
+     this is needed.  */
+  for (auto iter = pending_stops.begin ();
+       iter != pending_stops.end ();
+       ++iter)
+    {
+      if (desired_stop_thread_id == -1
+	  || desired_stop_thread_id == iter->thread_id)
+	{
+	  thread_id = iter->thread_id;
+	  *ourstatus = iter->status;
+	  current_event = iter->event;
+
+	  inferior_ptid = ptid_t (current_event.dwProcessId, thread_id, 0);
+	  current_windows_thread = thread_rec (inferior_ptid,
+					       INVALIDATE_CONTEXT);
+	  current_windows_thread->reload_context = 1;
+
+	  DEBUG_EVENTS (("get_windows_debug_event - "
+			 "pending stop found in 0x%x (desired=0x%x)\n",
+			 thread_id, desired_stop_thread_id));
+
+	  pending_stops.erase (iter);
+	  return thread_id;
+	}
+    }
+
   last_sig = GDB_SIGNAL_0;
 
-  if (!(debug_event = WaitForDebugEvent (&current_event, 1000)))
+  if (!(debug_event = wait_for_debug_event (&current_event, 1000)))
     goto out;
 
-  event_count++;
   continue_status = DBG_CONTINUE;
 
   event_code = current_event.dwDebugEventCode;
@@ -1564,8 +1568,7 @@ get_windows_debug_event (struct target_ops *ops,
 		     "CREATE_THREAD_DEBUG_EVENT"));
       if (saw_create != 1)
 	{
-	  struct inferior *inf;
-	  inf = find_inferior_pid (current_event.dwProcessId);
+	  inferior *inf = find_inferior_pid (this, current_event.dwProcessId);
 	  if (!saw_create && inf->attach_flag)
 	    {
 	      /* Kludge around a Windows bug where first event is a create
@@ -1580,7 +1583,7 @@ get_windows_debug_event (struct target_ops *ops,
       /* Record the existence of this thread.  */
       thread_id = current_event.dwThreadId;
       th = windows_add_thread
-        (ptid_t (current_event.dwProcessId, 0, current_event.dwThreadId),
+        (ptid_t (current_event.dwProcessId, current_event.dwThreadId, 0),
 	 current_event.u.CreateThread.hThread,
 	 current_event.u.CreateThread.lpThreadLocalBase,
 	 false /* main_thread_p */);
@@ -1592,8 +1595,8 @@ get_windows_debug_event (struct target_ops *ops,
 		     (unsigned) current_event.dwProcessId,
 		     (unsigned) current_event.dwThreadId,
 		     "EXIT_THREAD_DEBUG_EVENT"));
-      windows_delete_thread (ptid_t (current_event.dwProcessId, 0,
-				     current_event.dwThreadId),
+      windows_delete_thread (ptid_t (current_event.dwProcessId,
+				     current_event.dwThreadId, 0),
 			     current_event.u.ExitThread.dwExitCode,
 			     false /* main_thread_p */);
       th = &dummy_thread_info;
@@ -1611,8 +1614,8 @@ get_windows_debug_event (struct target_ops *ops,
       current_process_handle = current_event.u.CreateProcessInfo.hProcess;
       /* Add the main thread.  */
       th = windows_add_thread
-        (ptid_t (current_event.dwProcessId, 0,
-		 current_event.dwThreadId),
+        (ptid_t (current_event.dwProcessId,
+		 current_event.dwThreadId, 0),
 	 current_event.u.CreateProcessInfo.hThread,
 	 current_event.u.CreateProcessInfo.lpThreadLocalBase,
 	 true /* main_thread_p */);
@@ -1633,11 +1636,26 @@ get_windows_debug_event (struct target_ops *ops,
 	}
       else if (saw_create == 1)
 	{
-	  windows_delete_thread (ptid_t (current_event.dwProcessId, 0,
-					 current_event.dwThreadId),
+	  windows_delete_thread (ptid_t (current_event.dwProcessId,
+					 current_event.dwThreadId, 0),
 				 0, true /* main_thread_p */);
-	  ourstatus->kind = TARGET_WAITKIND_EXITED;
-	  ourstatus->value.integer = current_event.u.ExitProcess.dwExitCode;
+	  DWORD exit_status = current_event.u.ExitProcess.dwExitCode;
+	  /* If the exit status looks like a fatal exception, but we
+	     don't recognize the exception's code, make the original
+	     exit status value available, to avoid losing
+	     information.  */
+	  int exit_signal
+	    = WIFSIGNALED (exit_status) ? WTERMSIG (exit_status) : -1;
+	  if (exit_signal == -1)
+	    {
+	      ourstatus->kind = TARGET_WAITKIND_EXITED;
+	      ourstatus->value.integer = exit_status;
+	    }
+	  else
+	    {
+	      ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
+	      ourstatus->value.sig = gdb_signal_from_host (exit_signal);
+	    }
 	  thread_id = current_event.dwThreadId;
 	}
       break;
@@ -1676,7 +1694,7 @@ get_windows_debug_event (struct target_ops *ops,
 		     "EXCEPTION_DEBUG_EVENT"));
       if (saw_create != 1)
 	break;
-      switch (handle_exception (ourstatus))
+      switch (handle_exception (ourstatus, debug_exceptions))
 	{
 	case HANDLE_EXCEPTION_UNHANDLED:
 	default:
@@ -1714,14 +1732,36 @@ get_windows_debug_event (struct target_ops *ops,
 
   if (!thread_id || saw_create != 1)
     {
-      CHECK (windows_continue (continue_status, -1, 0));
+      CHECK (windows_continue (continue_status, desired_stop_thread_id, 0));
+    }
+  else if (desired_stop_thread_id != -1 && desired_stop_thread_id != thread_id)
+    {
+      /* Pending stop.  See the comment by the definition of
+	 "pending_stops" for details on why this is needed.  */
+      DEBUG_EVENTS (("get_windows_debug_event - "
+		     "unexpected stop in 0x%x (expecting 0x%x)\n",
+		     thread_id, desired_stop_thread_id));
+
+      if (current_event.dwDebugEventCode == EXCEPTION_DEBUG_EVENT
+	  && (current_event.u.Exception.ExceptionRecord.ExceptionCode
+	      == EXCEPTION_BREAKPOINT)
+	  && windows_initialization_done)
+	{
+	  ptid_t ptid = ptid_t (current_event.dwProcessId, thread_id, 0);
+	  th = thread_rec (ptid, INVALIDATE_CONTEXT);
+	  th->stopped_at_software_breakpoint = true;
+	}
+      pending_stops.push_back ({thread_id, *ourstatus, current_event});
+      thread_id = 0;
+      CHECK (windows_continue (continue_status, desired_stop_thread_id, 0));
     }
   else
     {
-      inferior_ptid = ptid_t (current_event.dwProcessId, 0, thread_id);
-      current_thread = th;
-      if (!current_thread)
-	current_thread = thread_rec (thread_id, TRUE);
+      inferior_ptid = ptid_t (current_event.dwProcessId, thread_id, 0);
+      current_windows_thread = th;
+      if (!current_windows_thread)
+	current_windows_thread = thread_rec (inferior_ptid,
+					     INVALIDATE_CONTEXT);
     }
 
 out:
@@ -1772,11 +1812,25 @@ windows_nat_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
 	     the user tries to resume the execution in the inferior.
 	     This is a classic race that we should try to fix one day.  */
       SetConsoleCtrlHandler (&ctrl_c_handler, TRUE);
-      retval = get_windows_debug_event (this, pid, ourstatus);
+      retval = get_windows_debug_event (pid, ourstatus);
       SetConsoleCtrlHandler (&ctrl_c_handler, FALSE);
 
       if (retval)
-	return ptid_t (current_event.dwProcessId, 0, retval);
+	{
+	  ptid_t result = ptid_t (current_event.dwProcessId, retval, 0);
+
+	  if (current_windows_thread != nullptr)
+	    {
+	      current_windows_thread->stopped_at_software_breakpoint = false;
+	      if (current_event.dwDebugEventCode == EXCEPTION_DEBUG_EVENT
+		  && (current_event.u.Exception.ExceptionRecord.ExceptionCode
+		      == EXCEPTION_BREAKPOINT)
+		  && windows_initialization_done)
+		current_windows_thread->stopped_at_software_breakpoint = true;
+	    }
+
+	  return result;
+	}
       else
 	{
 	  int detach = 0;
@@ -1801,28 +1855,82 @@ windows_add_all_dlls (void)
   HMODULE *hmodules;
   int i;
 
-  if (EnumProcessModules (current_process_handle, &dummy_hmodule,
-			  sizeof (HMODULE), &cb_needed) == 0)
-    return;
+#ifdef __x86_64__
+  if (wow64_process)
+    {
+      if (EnumProcessModulesEx (current_process_handle, &dummy_hmodule,
+				sizeof (HMODULE), &cb_needed,
+				LIST_MODULES_32BIT) == 0)
+	return;
+    }
+  else
+#endif
+    {
+      if (EnumProcessModules (current_process_handle, &dummy_hmodule,
+			      sizeof (HMODULE), &cb_needed) == 0)
+	return;
+    }
 
   if (cb_needed < 1)
     return;
 
   hmodules = (HMODULE *) alloca (cb_needed);
-  if (EnumProcessModules (current_process_handle, hmodules,
-			  cb_needed, &cb_needed) == 0)
-    return;
+#ifdef __x86_64__
+  if (wow64_process)
+    {
+      if (EnumProcessModulesEx (current_process_handle, hmodules,
+				cb_needed, &cb_needed,
+				LIST_MODULES_32BIT) == 0)
+	return;
+    }
+  else
+#endif
+    {
+      if (EnumProcessModules (current_process_handle, hmodules,
+			      cb_needed, &cb_needed) == 0)
+	return;
+    }
 
+  char system_dir[__PMAX];
+  char syswow_dir[__PMAX];
+  size_t system_dir_len = 0;
+  bool convert_syswow_dir = false;
+#ifdef __x86_64__
+  if (wow64_process)
+#endif
+    {
+      /* This fails on 32bit Windows because it has no SysWOW64 directory,
+	 and in this case a path conversion isn't necessary.  */
+      UINT len = GetSystemWow64DirectoryA (syswow_dir, sizeof (syswow_dir));
+      if (len > 0)
+	{
+	  /* Check that we have passed a large enough buffer.  */
+	  gdb_assert (len < sizeof (syswow_dir));
+
+	  len = GetSystemDirectoryA (system_dir, sizeof (system_dir));
+	  /* Error check.  */
+	  gdb_assert (len != 0);
+	  /* Check that we have passed a large enough buffer.  */
+	  gdb_assert (len < sizeof (system_dir));
+
+	  strcat (system_dir, "\\");
+	  strcat (syswow_dir, "\\");
+	  system_dir_len = strlen (system_dir);
+
+	  convert_syswow_dir = true;
+	}
+
+    }
   for (i = 1; i < (int) (cb_needed / sizeof (HMODULE)); i++)
     {
       MODULEINFO mi;
 #ifdef __USEWIDE
       wchar_t dll_name[__PMAX];
-      char name[__PMAX];
+      char dll_name_mb[__PMAX];
 #else
       char dll_name[__PMAX];
-      char *name;
 #endif
+      const char *name;
       if (GetModuleInformation (current_process_handle, hmodules[i],
 				&mi, sizeof (mi)) == 0)
 	continue;
@@ -1830,10 +1938,23 @@ windows_add_all_dlls (void)
 			       dll_name, sizeof (dll_name)) == 0)
 	continue;
 #ifdef __USEWIDE
-      wcstombs (name, dll_name, __PMAX);
+      wcstombs (dll_name_mb, dll_name, __PMAX);
+      name = dll_name_mb;
 #else
       name = dll_name;
 #endif
+      /* Convert the DLL path of 32bit processes returned by
+	 GetModuleFileNameEx from the 64bit system directory to the
+	 32bit syswow64 directory if necessary.  */
+      std::string syswow_dll_path;
+      if (convert_syswow_dir
+	  && strncasecmp (name, system_dir, system_dir_len) == 0
+	  && strchr (name + system_dir_len, '\\') == nullptr)
+	{
+	  syswow_dll_path = syswow_dir;
+	  syswow_dll_path += name + system_dir_len;
+	  name = syswow_dll_path.c_str();
+	}
 
       solib_end->next = windows_make_so (name, mi.lpBaseOfDll);
       solib_end = solib_end->next;
@@ -1847,8 +1968,6 @@ do_initial_windows_stuff (struct target_ops *ops, DWORD pid, int attaching)
   struct inferior *inf;
 
   last_sig = GDB_SIGNAL_0;
-  event_count = 0;
-  exception_count = 0;
   open_process_used = 0;
   debug_registers_changed = 0;
   debug_registers_used = 0;
@@ -1866,6 +1985,21 @@ do_initial_windows_stuff (struct target_ops *ops, DWORD pid, int attaching)
   clear_proceed_status (0);
   init_wait_for_inferior ();
 
+#ifdef __x86_64__
+  ignore_first_breakpoint = !attaching && wow64_process;
+
+  if (!wow64_process)
+    {
+      windows_set_context_register_offsets (amd64_mappings);
+      windows_set_segment_register_p (amd64_windows_segment_register_p);
+    }
+  else
+#endif
+    {
+      windows_set_context_register_offsets (i386_mappings);
+      windows_set_segment_register_p (i386_windows_segment_register_p);
+    }
+
   inf = current_inferior ();
   inferior_appeared (inf, pid);
   inf->attach_flag = attaching;
@@ -1999,13 +2133,14 @@ windows_nat_target::attach (const char *args, int from_tty)
 #endif
 
   if (!ok)
-    error (_("Can't attach to process."));
+    error (_("Can't attach to process %u (error %u)"),
+	   (unsigned) pid, (unsigned) GetLastError ());
 
   DebugSetProcessKillOnExit (FALSE);
 
   if (from_tty)
     {
-      char *exec_file = (char *) get_exec_file (0);
+      const char *exec_file = get_exec_file (0);
 
       if (exec_file)
 	printf_unfiltered ("Attaching to program `%s', %s\n", exec_file,
@@ -2015,6 +2150,17 @@ windows_nat_target::attach (const char *args, int from_tty)
 			   target_pid_to_str (ptid_t (pid)).c_str ());
     }
 
+#ifdef __x86_64__
+  HANDLE h = OpenProcess (PROCESS_QUERY_INFORMATION, FALSE, pid);
+  if (h != NULL)
+    {
+      BOOL wow64;
+      if (IsWow64Process (h, &wow64))
+	wow64_process = wow64;
+      CloseHandle (h);
+    }
+#endif
+
   do_initial_windows_stuff (this, pid, 1);
   target_terminal::ours ();
 }
@@ -2069,9 +2215,21 @@ windows_get_exec_module_filename (char *exe_name_ret, size_t exe_name_max_len)
   DWORD cbNeeded;
 
   cbNeeded = 0;
-  if (!EnumProcessModules (current_process_handle, &dh_buf,
-			   sizeof (HMODULE), &cbNeeded) || !cbNeeded)
-    return 0;
+#ifdef __x86_64__
+  if (wow64_process)
+    {
+      if (!EnumProcessModulesEx (current_process_handle, &dh_buf,
+				 sizeof (HMODULE), &cbNeeded,
+				 LIST_MODULES_32BIT) || !cbNeeded)
+	return 0;
+    }
+  else
+#endif
+    {
+      if (!EnumProcessModules (current_process_handle, &dh_buf,
+			       sizeof (HMODULE), &cbNeeded) || !cbNeeded)
+	return 0;
+    }
 
   /* We know the executable is always first in the list of modules,
      which we just fetched.  So no need to fetch more.  */
@@ -2725,7 +2883,7 @@ windows_nat_target::create_inferior (const char *exec_file,
 	redirect_inferior_handles (allargs, allargs_copy,
 				   &fd_inp, &fd_out, &fd_err);
       if (errno)
-	warning (_("Error in redirection: %s."), strerror (errno));
+	warning (_("Error in redirection: %s."), safe_strerror (errno));
       else
 	errno = e;
       allargs_len = strlen (allargs_copy);
@@ -2829,6 +2987,12 @@ windows_nat_target::create_inferior (const char *exec_file,
     error (_("Error creating process %s, (error %u)."),
 	   exec_file, (unsigned) GetLastError ());
 
+#ifdef __x86_64__
+  BOOL wow64;
+  if (IsWow64Process (pi.hProcess, &wow64))
+    wow64_process = wow64;
+#endif
+
   CloseHandle (pi.hThread);
   CloseHandle (pi.hProcess);
 
@@ -2852,6 +3016,7 @@ windows_nat_target::mourn_inferior ()
       CHECK (CloseHandle (current_process_handle));
       open_process_used = 0;
     }
+  siginfo_er.ExceptionCode = 0;
   inf_child_target::mourn_inferior ();
 }
 
@@ -2915,7 +3080,7 @@ windows_nat_target::kill ()
     {
       if (!windows_continue (DBG_CONTINUE, -1, 1))
 	break;
-      if (!WaitForDebugEvent (&current_event, INFINITE))
+      if (!wait_for_debug_event (&current_event, INFINITE))
 	break;
       if (current_event.dwDebugEventCode == EXIT_PROCESS_DEBUG_EVENT)
 	break;
@@ -2935,8 +3100,8 @@ windows_nat_target::close ()
 std::string
 windows_nat_target::pid_to_str (ptid_t ptid)
 {
-  if (ptid.tid () != 0)
-    return string_printf ("Thread %d.0x%lx", ptid.pid (), ptid.tid ());
+  if (ptid.lwp () != 0)
+    return string_printf ("Thread %d.0x%lx", ptid.pid (), ptid.lwp ());
 
   return normal_pid_to_str (ptid);
 }
@@ -2964,6 +3129,7 @@ windows_xfer_shared_libraries (struct target_ops *ops,
 
       windows_xfer_shared_library (so->so_name, (CORE_ADDR)
 				   (uintptr_t) li->load_addr,
+				   &li->text_offset,
 				   target_gdbarch (), &obstack);
     }
   obstack_grow_str0 (&obstack, "</library-list>\n");
@@ -2984,6 +3150,51 @@ windows_xfer_shared_libraries (struct target_ops *ops,
   return len != 0 ? TARGET_XFER_OK : TARGET_XFER_EOF;
 }
 
+/* Helper for windows_nat_target::xfer_partial that handles signal info.  */
+
+static enum target_xfer_status
+windows_xfer_siginfo (gdb_byte *readbuf, ULONGEST offset, ULONGEST len,
+		      ULONGEST *xfered_len)
+{
+  char *buf = (char *) &siginfo_er;
+  size_t bufsize = sizeof (siginfo_er);
+
+#ifdef __x86_64__
+  EXCEPTION_RECORD32 er32;
+  if (wow64_process)
+    {
+      buf = (char *) &er32;
+      bufsize = sizeof (er32);
+
+      er32.ExceptionCode = siginfo_er.ExceptionCode;
+      er32.ExceptionFlags = siginfo_er.ExceptionFlags;
+      er32.ExceptionRecord = (uintptr_t) siginfo_er.ExceptionRecord;
+      er32.ExceptionAddress = (uintptr_t) siginfo_er.ExceptionAddress;
+      er32.NumberParameters = siginfo_er.NumberParameters;
+      int i;
+      for (i = 0; i < EXCEPTION_MAXIMUM_PARAMETERS; i++)
+	er32.ExceptionInformation[i] = siginfo_er.ExceptionInformation[i];
+    }
+#endif
+
+  if (siginfo_er.ExceptionCode == 0)
+    return TARGET_XFER_E_IO;
+
+  if (readbuf == nullptr)
+    return TARGET_XFER_E_IO;
+
+  if (offset > bufsize)
+    return TARGET_XFER_E_IO;
+
+  if (offset + len > bufsize)
+    len = bufsize - offset;
+
+  memcpy (readbuf, buf + offset, len);
+  *xfered_len = len;
+
+  return TARGET_XFER_OK;
+}
+
 enum target_xfer_status
 windows_nat_target::xfer_partial (enum target_object object,
 				  const char *annex, gdb_byte *readbuf,
@@ -2999,6 +3210,9 @@ windows_nat_target::xfer_partial (enum target_object object,
       return windows_xfer_shared_libraries (this, object, annex, readbuf,
 					    writebuf, offset, len, xfered_len);
 
+    case TARGET_OBJECT_SIGNAL_INFO:
+      return windows_xfer_siginfo (readbuf, offset, len, xfered_len);
+
     default:
       if (beneath () == NULL)
 	{
@@ -3021,7 +3235,7 @@ windows_nat_target::get_tib_address (ptid_t ptid, CORE_ADDR *addr)
 {
   windows_thread_info *th;
 
-  th = thread_rec (ptid.tid (), 0);
+  th = thread_rec (ptid, DONT_INVALIDATE_CONTEXT);
   if (th == NULL)
     return false;
 
@@ -3034,7 +3248,7 @@ windows_nat_target::get_tib_address (ptid_t ptid, CORE_ADDR *addr)
 ptid_t
 windows_nat_target::get_ada_task_ptid (long lwp, long thread)
 {
-  return ptid_t (inferior_ptid.pid (), 0, lwp);
+  return ptid_t (inferior_ptid.pid (), lwp, 0);
 }
 
 /* Implementation of the to_thread_name method.  */
@@ -3042,12 +3256,13 @@ windows_nat_target::get_ada_task_ptid (long lwp, long thread)
 const char *
 windows_nat_target::thread_name (struct thread_info *thr)
 {
-  return thread_rec (thr->ptid.tid (), 0)->name;
+  return thread_rec (thr->ptid, DONT_INVALIDATE_CONTEXT)->name.get ();
 }
 
 
+void _initialize_windows_nat ();
 void
-_initialize_windows_nat (void)
+_initialize_windows_nat ()
 {
   x86_dr_low.set_control = cygwin_set_dr7;
   x86_dr_low.set_addr = cygwin_set_dr;
@@ -3200,16 +3415,15 @@ cygwin_get_dr7 (void)
 bool
 windows_nat_target::thread_alive (ptid_t ptid)
 {
-  int tid;
-
-  gdb_assert (ptid.tid () != 0);
-  tid = ptid.tid ();
+  gdb_assert (ptid.lwp () != 0);
 
-  return WaitForSingleObject (thread_rec (tid, FALSE)->h, 0) != WAIT_OBJECT_0;
+  return (WaitForSingleObject (thread_rec (ptid, DONT_INVALIDATE_CONTEXT)->h, 0)
+	  != WAIT_OBJECT_0);
 }
 
+void _initialize_check_for_gdb_ini ();
 void
-_initialize_check_for_gdb_ini (void)
+_initialize_check_for_gdb_ini ()
 {
   char *homedir;
   if (inhibit_gdbinit)
@@ -3305,8 +3519,9 @@ bad_GetConsoleFontSize (HANDLE w, DWORD nFont)
 /* Load any functions which may not be available in ancient versions
    of Windows.  */
 
+void _initialize_loadable ();
 void
-_initialize_loadable (void)
+_initialize_loadable ()
 {
   HMODULE hm = NULL;
 
@@ -3322,6 +3537,12 @@ _initialize_loadable (void)
       GPA (hm, GetConsoleFontSize);
       GPA (hm, DebugActiveProcessStop);
       GPA (hm, GetCurrentConsoleFont);
+#ifdef __x86_64__
+      GPA (hm, Wow64SuspendThread);
+      GPA (hm, Wow64GetThreadContext);
+      GPA (hm, Wow64SetThreadContext);
+      GPA (hm, Wow64GetThreadSelectorEntry);
+#endif
     }
 
   /* Set variables to dummy versions of these processes if the function
@@ -3344,6 +3565,9 @@ _initialize_loadable (void)
   if (hm)
     {
       GPA (hm, EnumProcessModules);
+#ifdef __x86_64__
+      GPA (hm, EnumProcessModulesEx);
+#endif
       GPA (hm, GetModuleInformation);
       GetModuleFileNameEx = (GetModuleFileNameEx_ftype *)
         GetProcAddress (hm, GetModuleFileNameEx_name);