Windows CE support.

1 files changed, 2034 insertions, 0 deletions

diff --git a/gdb/wince.c b/gdb/wince.c
new file mode 100644
index 0000000..bdd7c2f
--- /dev/null
+++ b/gdb/wince.c
@@ -0,0 +1,2034 @@
+/* Target-vector operations for controlling Windows CE child processes, for GDB.
+   Copyright 1999, 2000 Free Software Foundation, Inc.
+   Contributed by Cygnus Solutions, A Red Hat Company.
+
+   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 2 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 eve nthe 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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.
+ */
+
+/* by Christopher Faylor (cgf@cygnus.com) */
+
+/* We assume we're being built with and will be used for cygwin.  */
+
+#ifdef SHx
+#undef SH4
+#define SH4			/* Just to get all of the CONTEXT defines. */
+#endif
+
+#include "defs.h"
+#include "frame.h"		/* required by inferior.h */
+#include "inferior.h"
+#include "target.h"
+#include "wait.h"
+#include "gdbcore.h"
+#include "command.h"
+#include <signal.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <stdlib.h>
+
+#include <windows.h>
+#include <rapi.h>
+#include <netdb.h>
+#include <cygwin/in.h>
+#include <cygwin/socket.h>
+
+#include "buildsym.h"
+#include "symfile.h"
+#include "objfiles.h"
+#include "gdb_string.h"
+#include "gdbthread.h"
+#include "gdbcmd.h"
+#include <sys/param.h>
+#include "wince-stub.h"
+#include "dcache.h"
+
+/* The ui's event loop. */
+extern int (*ui_loop_hook) PARAMS ((int signo));
+
+/* If we're not using the old Cygwin header file set, define the
+   following which never should have been in the generic Win32 API
+   headers in the first place since they were our own invention... */
+#ifndef _GNU_H_WINDOWS_H
+#define FLAG_TRACE_BIT 0x100
+#ifdef CONTEXT_FLOATING_POINT
+#define CONTEXT_DEBUGGER0 (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
+#else
+#define CONTEXT_DEBUGGER0 (CONTEXT_FULL)
+#endif
+#endif
+
+#ifdef SH4
+#define CONTEXT_DEBUGGER ((CONTEXT_DEBUGGER0 & ~(CONTEXT_SH4 | CONTEXT_FLOATING_POINT)) | CONTEXT_SH3)
+#else
+#define CONTEXT_DEBUGGER CONTEXT_DEBUGGER0
+#endif
+/* The string sent by cygwin when it processes a signal.
+   FIXME: This should be in a cygwin include file. */
+#define CYGWIN_SIGNAL_STRING "cygwin: signal"
+
+#define CHECK(x)	check (x, __FILE__,__LINE__)
+#define DEBUG_EXEC(x)	if (debug_exec)		printf x
+#define DEBUG_EVENTS(x)	if (debug_events)	printf x
+#define DEBUG_MEM(x)	if (debug_memory)	printf x
+#define DEBUG_EXCEPT(x)	if (debug_exceptions)	printf x
+
+static int connection_initialized = 0;	/* True if we've initialized a RAPI session. */
+
+static DCACHE *remote_dcache;
+
+/* The directory where the stub and executable files are uploaded. */
+static const char *remote_directory = "\\gdb";
+
+/* The types automatic upload available. */
+static enum
+  {
+    UPLOAD_ALWAYS = 0,
+    UPLOAD_NEWER = 1,
+    UPLOAD_NEVER = 2
+  }
+upload_when = UPLOAD_NEWER;
+
+/* Valid options for 'set remoteupload'.  Note that options
+   must track upload_when enum. */
+static struct opts
+  {
+    const char *name;
+    int abbrev;
+  }
+upload_options[3] =
+{
+  {
+    "always", 1
+  }
+  ,
+  {
+    "newer", 3
+  }
+  ,
+  {
+    "never", 3
+  }
+};
+
+static char *remote_upload = NULL;	/* Set by set remoteupload */
+static int remote_add_host = 0;
+
+/* Forward declaration */
+extern struct target_ops child_ops;
+
+static int win32_child_thread_alive PARAMS ((int));
+void child_kill_inferior PARAMS ((void));
+
+static int last_sig = 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 thread_info_struct
+  {
+    struct thread_info_struct *next;
+    DWORD id;
+    HANDLE h;
+    char *name;
+    int suspend_count;
+    int stepped;		/* True if stepped. */
+    CORE_ADDR step_pc;
+    unsigned long step_instr;
+    unsigned long step_prev;
+    CONTEXT context;
+  }
+thread_info;
+
+static thread_info thread_head =
+{NULL};
+
+/* 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 thread_info *current_thread;	/* Info on currently selected thread */
+static thread_info *this_thread;	/* Info on thread returned by wait_for_debug_event */
+static DWORD main_thread_id;	/* Thread ID of the main thread */
+
+/* Counts of things. */
+static int exception_count = 0;
+static int event_count = 0;
+
+/* User options. */
+static int debug_exec = 0;	/* show execution */
+static int debug_events = 0;	/* show events from kernel */
+static int debug_memory = 0;	/* show target memory accesses */
+static int debug_exceptions = 0;	/* show target exceptions */
+
+/* An array of offset mappings into a Win32 Context structure.
+   This is a one-to-one mapping which is indexed by gdb's register
+   numbers.  It retrieves an offset into the context structure where
+   the 4 byte register is located.
+   An offset value of -1 indicates that Win32 does not provide this
+   register in it's CONTEXT structure.  regptr will return zero for this
+   register.
+
+   This is used by the regptr function. */
+#define context_offset(x) ((int)&(((PCONTEXT)NULL)->x))
+static const int mappings[NUM_REGS + 1] =
+{
+#ifdef __i386__
+  context_offset (Eax),
+  context_offset (Ecx),
+  context_offset (Edx),
+  context_offset (Ebx),
+  context_offset (Esp),
+  context_offset (Ebp),
+  context_offset (Esi),
+  context_offset (Edi),
+  context_offset (Eip),
+  context_offset (EFlags),
+  context_offset (SegCs),
+  context_offset (SegSs),
+  context_offset (SegDs),
+  context_offset (SegEs),
+  context_offset (SegFs),
+  context_offset (SegGs),
+  context_offset (FloatSave.RegisterArea[0 * 10]),
+  context_offset (FloatSave.RegisterArea[1 * 10]),
+  context_offset (FloatSave.RegisterArea[2 * 10]),
+  context_offset (FloatSave.RegisterArea[3 * 10]),
+  context_offset (FloatSave.RegisterArea[4 * 10]),
+  context_offset (FloatSave.RegisterArea[5 * 10]),
+  context_offset (FloatSave.RegisterArea[6 * 10]),
+  context_offset (FloatSave.RegisterArea[7 * 10]),
+#elif defined(SHx)
+  context_offset (R0),
+  context_offset (R1),
+  context_offset (R2),
+  context_offset (R3),
+  context_offset (R4),
+  context_offset (R5),
+  context_offset (R6),
+  context_offset (R7),
+  context_offset (R8),
+  context_offset (R9),
+  context_offset (R10),
+  context_offset (R11),
+  context_offset (R12),
+  context_offset (R13),
+  context_offset (R14),
+  context_offset (R15),
+  context_offset (Fir),
+  context_offset (PR),		/* Procedure Register */
+  context_offset (GBR),		/* Global Base Register */
+  context_offset (MACH),	/* Accumulate */
+  context_offset (MACL),	/* Multiply */
+  context_offset (Psr),
+  context_offset (Fpul),
+  context_offset (Fpscr),
+  context_offset (FRegs[0]),
+  context_offset (FRegs[1]),
+  context_offset (FRegs[2]),
+  context_offset (FRegs[3]),
+  context_offset (FRegs[4]),
+  context_offset (FRegs[5]),
+  context_offset (FRegs[6]),
+  context_offset (FRegs[7]),
+  context_offset (FRegs[8]),
+  context_offset (FRegs[9]),
+  context_offset (FRegs[10]),
+  context_offset (FRegs[11]),
+  context_offset (FRegs[12]),
+  context_offset (FRegs[13]),
+  context_offset (FRegs[14]),
+  context_offset (FRegs[15]),
+  context_offset (xFRegs[0]),
+  context_offset (xFRegs[1]),
+  context_offset (xFRegs[2]),
+  context_offset (xFRegs[3]),
+  context_offset (xFRegs[4]),
+  context_offset (xFRegs[5]),
+  context_offset (xFRegs[6]),
+  context_offset (xFRegs[7]),
+  context_offset (xFRegs[8]),
+  context_offset (xFRegs[9]),
+  context_offset (xFRegs[10]),
+  context_offset (xFRegs[11]),
+  context_offset (xFRegs[12]),
+  context_offset (xFRegs[13]),
+  context_offset (xFRegs[14]),
+  context_offset (xFRegs[15]),
+#elif defined(MIPS)
+  context_offset (IntZero),
+  context_offset (IntAt),
+  context_offset (IntV0),
+  context_offset (IntV1),
+  context_offset (IntA0),
+  context_offset (IntA1),
+  context_offset (IntA2),
+  context_offset (IntA3),
+  context_offset (IntT0),
+  context_offset (IntT1),
+  context_offset (IntT2),
+  context_offset (IntT3),
+  context_offset (IntT4),
+  context_offset (IntT5),
+  context_offset (IntT6),
+  context_offset (IntT7),
+  context_offset (IntS0),
+  context_offset (IntS1),
+  context_offset (IntS2),
+  context_offset (IntS3),
+  context_offset (IntS4),
+  context_offset (IntS5),
+  context_offset (IntS6),
+  context_offset (IntS7),
+  context_offset (IntT8),
+  context_offset (IntT9),
+  context_offset (IntK0),
+  context_offset (IntK1),
+  context_offset (IntGp),
+  context_offset (IntSp),
+  context_offset (IntS8),
+  context_offset (IntRa),
+  context_offset (Psr),
+  context_offset (IntLo),
+  context_offset (IntHi),
+  -1,				/* bad */
+  -1,				/* cause */
+  context_offset (Fir),
+  context_offset (FltF0),
+  context_offset (FltF1),
+  context_offset (FltF2),
+  context_offset (FltF3),
+  context_offset (FltF4),
+  context_offset (FltF5),
+  context_offset (FltF6),
+  context_offset (FltF7),
+  context_offset (FltF8),
+  context_offset (FltF9),
+  context_offset (FltF10),
+  context_offset (FltF11),
+  context_offset (FltF12),
+  context_offset (FltF13),
+  context_offset (FltF14),
+  context_offset (FltF15),
+  context_offset (FltF16),
+  context_offset (FltF17),
+  context_offset (FltF18),
+  context_offset (FltF19),
+  context_offset (FltF20),
+  context_offset (FltF21),
+  context_offset (FltF22),
+  context_offset (FltF23),
+  context_offset (FltF24),
+  context_offset (FltF25),
+  context_offset (FltF26),
+  context_offset (FltF27),
+  context_offset (FltF28),
+  context_offset (FltF29),
+  context_offset (FltF30),
+  context_offset (FltF31),
+  context_offset (Fsr),
+  context_offset (Fir),
+  -1,				/* fp */
+#elif defined(ARM)
+  context_offset (R0),
+  context_offset (R1),
+  context_offset (R2),
+  context_offset (R3),
+  context_offset (R4),
+  context_offset (R5),
+  context_offset (R6),
+  context_offset (R7),
+  context_offset (R8),
+  context_offset (R9),
+  context_offset (R10),
+  context_offset (R11),
+  context_offset (R12),
+  context_offset (Sp),
+  context_offset (Lr),
+  context_offset (Pc),
+  -1,
+  -1,
+  -1,
+  -1,
+  -1,
+  -1,
+  -1,
+  -1,
+  -1,
+  context_offset (Psr),
+#endif
+  -1
+};
+
+/* This vector maps the target's idea of an exception (extracted
+   from the DEBUG_EVENT structure) to GDB's idea. */
+
+struct xlate_exception
+  {
+    int them;
+    enum target_signal us;
+  };
+
+static const struct xlate_exception
+  xlate[] =
+{
+  {EXCEPTION_ACCESS_VIOLATION, TARGET_SIGNAL_SEGV},
+  {STATUS_STACK_OVERFLOW, TARGET_SIGNAL_SEGV},
+  {EXCEPTION_BREAKPOINT, TARGET_SIGNAL_TRAP},
+  {DBG_CONTROL_C, TARGET_SIGNAL_INT},
+  {EXCEPTION_SINGLE_STEP, TARGET_SIGNAL_TRAP},
+  {-1, -1}};
+
+/******************** Beginning of stub interface ********************/
+
+/* Stub interface description:
+
+   The Windows CE stub implements a crude RPC.  The hand-held device
+   connects to gdb using port 7000.  gdb and the stub then communicate
+   using packets where:
+
+   byte 0:              command id (e.g. Create Process)
+
+   byte 1-4:    DWORD
+
+   byte 1-2:    WORD
+
+   byte 1-2:    length
+   byte 3-n:    arbitrary memory.
+
+   The interface is deterministic, i.e., if the stub expects a DWORD then
+   the gdb server should send a DWORD.
+ */
+
+/* Note:  In the functions below, the `huh' parameter is a string passed from the
+   function containing a descriptive string concerning the current operation.
+   This is used for error reporting.
+
+   The 'what' parameter is a command id as found in wince-stub.h.
+
+   Hopefully, the rest of the parameters are self-explanatory.
+ */
+
+static int s;			/* communication socket */
+
+/* v-style interface for handling varying argyment list error messages.
+   Displays the error message in a dialog box and exits when user clicks
+   on OK. */
+static void
+vstub_error (LPCSTR fmt, va_list * args)
+{
+  char buf[4096];
+  vsprintf (buf, fmt, args);
+  s = -1;
+  error ("%s", buf);
+}
+
+/* The standard way to display an error message and exit. */
+static void
+stub_error (LPCSTR fmt,...)
+{
+  va_list args;
+  va_start (args, fmt);
+  vstub_error (fmt, args);
+}
+
+/* Standard "oh well" can't communicate error.  Someday this might attempt
+   synchronization. */
+static void
+attempt_resync (LPCSTR huh, int s)
+{
+  stub_error ("lost synchronization with target attempting %s", huh);
+}
+
+/* Read arbitrary stuff from a socket. */
+static int
+sockread (LPCSTR huh, int s, void *str, size_t n)
+{
+  for (;;)
+    {
+      if (recv (s, str, n, 0) == n)
+	return n;
+      attempt_resync (huh, s);
+    }
+}
+
+/* Write arbitrary stuff to a socket. */
+static int
+sockwrite (LPCSTR huh, const void *str, size_t n)
+{
+  for (;;)
+    {
+      if (send (s, str, n, 0) == n)
+	return n;
+      attempt_resync (huh, s);
+    }
+}
+
+/* Output an id/dword to the host */
+static void
+putdword (LPCSTR huh, gdb_wince_id what, DWORD n)
+{
+  if (sockwrite (huh, &what, sizeof (what)) != sizeof (what))
+    stub_error ("error writing record id to host for %s", huh);
+  if (sockwrite (huh, &n, sizeof (n)) != sizeof (n))
+    stub_error ("error writing %s to host.", huh);
+}
+
+/* Output an id/word to the host */
+static void
+putword (LPCSTR huh, gdb_wince_id what, WORD n)
+{
+  if (sockwrite (huh, &what, sizeof (what)) != sizeof (what))
+    stub_error ("error writing record id to host for %s", huh);
+  if (sockwrite (huh, &n, sizeof (n)) != sizeof (n))
+    stub_error ("error writing %s host.", huh);
+}
+
+/* Convenience define for outputting a "gdb_wince_len" type. */
+#define putlen(huh, what, n) putword((huh), (what), (gdb_wince_len) (n))
+
+/* Put an arbitrary block of memory to the gdb host.  This comes in
+   two chunks an id/dword representing the length and the stream of memory
+   itself. */
+static void
+putmemory (LPCSTR huh, gdb_wince_id what, const void *mem, gdb_wince_len len)
+{
+  putlen (huh, what, len);
+  if (((short) len > 0) && sockwrite (huh, mem, len) != len)
+    stub_error ("error writing %s to host.", huh);
+}
+
+/* Output the result of an operation to the host.  If res != 0, sends a block of
+   memory starting at mem of len bytes.  If res == 0, sends -GetLastError () and
+   avoids sending the mem. */
+static DWORD
+getdword (LPCSTR huh, gdb_wince_id what_this)
+{
+  DWORD n;
+  gdb_wince_id what;
+  do
+    if (sockread (huh, s, &what, sizeof (what)) != sizeof (what))
+      stub_error ("error getting record type from host - %s.", huh);
+  while (what_this != what);
+
+  if (sockread (huh, s, &n, sizeof (n)) != sizeof (n))
+    stub_error ("error getting %s from host.", huh);
+
+  return n;
+}
+
+/* Get a an ID (possibly) and a WORD from the host gdb.
+   Don't bother with the id if the main loop has already
+   read it. */
+static WORD
+getword (LPCSTR huh, gdb_wince_id what_this)
+{
+  WORD n;
+  gdb_wince_id what;
+  do
+    if (sockread (huh, s, &what, sizeof (what)) != sizeof (what))
+      stub_error ("error getting record type from host - %s.", huh);
+  while (what_this != what);
+
+  if (sockread (huh, s, &n, sizeof (n)) != sizeof (n))
+    stub_error ("error getting %s from host.", huh);
+
+  return n;
+}
+
+/* Handy defines for getting/putting various types of values. */
+#define gethandle(huh, what) (HANDLE) getdword ((huh), (what))
+#define getpvoid(huh, what) (LPVOID) getdword ((huh), (what))
+#define getlen(huh, what) (gdb_wince_len) getword ((huh), (what))
+#define puthandle(huh, what, h) putdword ((huh), (what), (DWORD) (h))
+#define putpvoid(huh, what, p) putdword ((huh), (what), (DWORD) (p))
+
+/* Retrieve the result of an operation from the stub.  If nbytes < 0) then nbytes
+   is actually an error and nothing else follows.  Use SetLastError to remember this.
+   if nbytes > 0, retrieve a block of *nbytes into buf.
+ */
+int
+getresult (LPCSTR huh, gdb_wince_id what, LPVOID buf, gdb_wince_len * nbytes)
+{
+  gdb_wince_len dummy;
+  if (nbytes == NULL)
+    nbytes = &dummy;
+
+  *nbytes = getlen (huh, what);
+
+  if ((short) *nbytes < 0)
+    {
+      SetLastError (-(short) *nbytes);
+      return 0;
+    }
+
+  if ((gdb_wince_len) sockread (huh, s, buf, *nbytes) != *nbytes)
+    stub_error ("couldn't read information from wince stub - %s", huh);
+
+  return 1;
+}
+
+/* Convert "narrow" string to "wide".  Manipulates a buffer ring of 8
+   buffers which hold the translated string.  This is an arbitrary limit
+   but it is approximately double the current needs of this module.
+ */
+LPWSTR
+towide (const char *s, gdb_wince_len * out_len)
+{
+  static int n = -1;
+  static LPWSTR outs[8] =
+  {NULL /*, NULL, etc. */ };
+  gdb_wince_len dummy;
+
+  if (!out_len)
+    out_len = &dummy;
+
+  /* First determine the length required to hold the converted string. */
+  *out_len = sizeof (WCHAR) * MultiByteToWideChar (CP_ACP, 0, s, -1, NULL, 0);
+  if (!*out_len)
+    return NULL;		/* The conversion failed */
+
+  if (++n >= (sizeof (outs) / sizeof (outs[0])))
+    n = 0;			/* wrap */
+
+  /* Allocate space for the converted string, reusing any previously allocated
+     space, if applicable. Note that if outs[n] is NULL, realloc will act as
+     a malloc (under cygwin, at least).
+   */
+  outs[n] = (LPWSTR) realloc (outs[n], *out_len);
+  memset (outs[n], 0, *out_len);
+  (void) MultiByteToWideChar (CP_ACP, 0, s, -1, outs[n], *out_len);
+  return outs[n];
+}
+
+/******************** Emulation routines start here. ********************
+
+  The functions below are modelled after their Win32 counterparts.  They are named
+  similarly to Win32 and take exactly the same arguments except where otherwise noted.
+  They communicate with the stub on the hand-held device by sending their arguments
+  over the socket and waiting for results from the socket.
+
+  There is one universal change.  In cases where a length is expected to be returned
+  in a DWORD, we use a gdb_wince_len type instead.  Currently this is an unsigned short
+  which is smaller than the standard Win32 DWORD.  This is done to minimize unnecessary
+  traffic since the connection to Windows CE can be slow.  To change this, modify the
+  typedef in wince-stub.h and change the putlen/getlen macros in this file and in
+  the stub.
+*/
+static int
+create_process (LPSTR exec_file, LPSTR args, DWORD flags, PROCESS_INFORMATION * pi)
+{
+  gdb_wince_len len;
+  LPWSTR buf;
+
+  buf = towide (exec_file, &len);
+  putmemory ("CreateProcess exec_file", GDB_CREATEPROCESS, buf, len);
+  buf = towide (args, &len);
+  putmemory ("CreateProcess args", GDB_CREATEPROCESS, buf, len);
+  putdword ("CreateProcess flags", GDB_CREATEPROCESS, flags);
+  return getresult ("CreateProcess result", GDB_CREATEPROCESS, pi, NULL);
+}
+
+/* Emulate TerminateProcess.  Don't bother with the second argument since CE
+   ignores it.
+ */
+static int
+terminate_process (HANDLE h)
+{
+  gdb_wince_result res;
+  if (s < 0)
+    return 1;
+  puthandle ("TerminateProcess handle", GDB_TERMINATEPROCESS, h);
+  return getresult ("TerminateProcess result", GDB_TERMINATEPROCESS, &res, NULL);
+}
+
+static int
+wait_for_debug_event (DEBUG_EVENT * ev, DWORD ms)
+{
+  if (s < 0)
+    return 1;
+  putdword ("WaitForDebugEvent ms", GDB_WAITFORDEBUGEVENT, ms);
+  return getresult ("WaitForDebugEvent event", GDB_WAITFORDEBUGEVENT, ev, NULL);
+}
+
+static int
+get_thread_context (HANDLE h, CONTEXT * c)
+{
+  if (s < 0)
+    return 1;
+  puthandle ("GetThreadContext handle", GDB_GETTHREADCONTEXT, h);
+  putdword ("GetThreadContext flags", GDB_GETTHREADCONTEXT, c->ContextFlags);
+  return getresult ("GetThreadContext context", GDB_GETTHREADCONTEXT, c, NULL);
+}
+
+static int
+set_thread_context (HANDLE h, CONTEXT * c)
+{
+  gdb_wince_result res;
+  if (s < 0)
+    return 1;
+  puthandle ("SetThreadContext handle", GDB_SETTHREADCONTEXT, h);
+  putmemory ("SetThreadContext context", GDB_SETTHREADCONTEXT, c, sizeof (*c));
+  return getresult ("SetThreadContext context", GDB_SETTHREADCONTEXT, &res, NULL);
+}
+
+static int
+read_process_memory (HANDLE h, LPCVOID where, LPVOID buf, gdb_wince_len len, gdb_wince_len * nbytes)
+{
+  if (s < 0)
+    return 1;
+  puthandle ("ReadProcessMemory handle", GDB_READPROCESSMEMORY, h);
+  putpvoid ("ReadProcessMemory location", GDB_READPROCESSMEMORY, where);
+  putlen ("ReadProcessMemory size", GDB_READPROCESSMEMORY, len);
+
+  return getresult ("ReadProcessMemory buf", GDB_READPROCESSMEMORY, buf, nbytes);
+}
+
+static int
+write_process_memory (HANDLE h, LPCVOID where, LPCVOID buf, gdb_wince_len len, gdb_wince_len * nbytes)
+{
+  if (s < 0)
+    return 1;
+  puthandle ("WriteProcessMemory handle", GDB_WRITEPROCESSMEMORY, h);
+  putpvoid ("WriteProcessMemory location", GDB_WRITEPROCESSMEMORY, where);
+  putmemory ("WriteProcProcessMemory buf", GDB_WRITEPROCESSMEMORY, buf, len);
+
+  return getresult ("WriteProcessMemory result", GDB_WRITEPROCESSMEMORY, nbytes, NULL);
+}
+
+static int
+remote_read_bytes (CORE_ADDR memaddr, char *myaddr, int len)
+{
+  gdb_wince_len nbytes;
+  if (!read_process_memory (current_process_handle, (LPCVOID) memaddr,
+			    (LPVOID) myaddr, len, &nbytes))
+    return -1;
+  return nbytes;
+}
+
+static int
+remote_write_bytes (CORE_ADDR memaddr, char *myaddr, int len)
+{
+  gdb_wince_len nbytes;
+  if (!write_process_memory (current_process_handle, (LPCVOID) memaddr,
+			     (LPCVOID) myaddr, len, &nbytes))
+    return -1;
+  return nbytes;
+}
+
+/* This is not a standard Win32 function.  It instructs the stub to return TRUE
+   if the thread referenced by HANDLE h is alive.
+ */
+static int
+thread_alive (HANDLE h)
+{
+  gdb_wince_result res;
+  if (s < 0)
+    return 1;
+  puthandle ("ThreadAlive handle", GDB_THREADALIVE, h);
+  return getresult ("ThreadAlive result", GDB_THREADALIVE, &res, NULL);
+}
+
+static int
+suspend_thread (HANDLE h)
+{
+  if (s < 0)
+    return 1;
+  puthandle ("SuspendThread handle", GDB_SUSPENDTHREAD, h);
+  return (int) getdword ("SuspendThread result", GDB_SUSPENDTHREAD);
+}
+
+static int
+resume_thread (HANDLE h)
+{
+  if (s < 0)
+    return 1;
+  puthandle ("ResumeThread handle", GDB_RESUMETHREAD, h);
+  return (int) getdword ("SuspendThread result", GDB_RESUMETHREAD);
+}
+
+static int
+continue_debug_event (DWORD pid, DWORD tid, DWORD status)
+{
+  gdb_wince_result res;
+  if (s < 0)
+    return 0;
+  putdword ("ContinueDebugEvent pid", GDB_CONTINUEDEBUGEVENT, pid);
+  putdword ("ContinueDebugEvent tid", GDB_CONTINUEDEBUGEVENT, tid);
+  putdword ("ContinueDebugEvent status", GDB_CONTINUEDEBUGEVENT, status);
+  return getresult ("ContinueDebugEvent result", GDB_CONTINUEDEBUGEVENT, &res, NULL);
+}
+
+static int
+close_handle (HANDLE h)
+{
+  gdb_wince_result res;
+  if (s < 0)
+    return 1;
+  puthandle ("CloseHandle handle", GDB_CLOSEHANDLE, h);
+  return (int) getresult ("CloseHandle result", GDB_CLOSEHANDLE, &res, NULL);
+}
+
+/* This is not a standard Win32 interface.  This function tells the stub
+   to terminate.
+ */
+static void
+stop_stub ()
+{
+  if (s < 0)
+    return;
+  (void) putdword ("Stopping gdb stub", GDB_STOPSTUB, 0);
+  s = -1;
+}
+
+/******************** End of emulation routines. ********************/
+/******************** End of stub interface ********************/
+
+/* Find a thread record given a thread id.
+   If get_context then also retrieve the context for this
+   thread. */
+static thread_info *
+thread_rec (DWORD id, int get_context)
+{
+  thread_info *th;
+
+  for (th = &thread_head; (th = th->next) != NULL;)
+    if (th->id == id)
+      {
+	if (!th->suspend_count && get_context)
+	  {
+	    if (get_context > 0 && th != this_thread)
+	      th->suspend_count = suspend_thread (th->h) + 1;
+	    else if (get_context < 0)
+	      th->suspend_count = -1;
+
+	    th->context.ContextFlags = CONTEXT_DEBUGGER;
+	    get_thread_context (th->h, &th->context);
+	  }
+	return th;
+      }
+
+  return NULL;
+}
+
+/* Add a thread to the thread list */
+static thread_info *
+child_add_thread (DWORD id, HANDLE h)
+{
+  thread_info *th;
+
+  if ((th = thread_rec (id, FALSE)))
+    return th;
+
+  th = (thread_info *) xmalloc (sizeof (*th));
+  memset (th, 0, sizeof (*th));
+  th->id = id;
+  th->h = h;
+  th->next = thread_head.next;
+  thread_head.next = th;
+  add_thread (id);
+  return th;
+}
+
+/* Clear out any old thread list and reintialize it to a
+   pristine state. */
+static void
+child_init_thread_list ()
+{
+  thread_info *th = &thread_head;
+
+  DEBUG_EVENTS (("gdb: child_init_thread_list\n"));
+  init_thread_list ();
+  while (th->next != NULL)
+    {
+      thread_info *here = th->next;
+      th->next = here->next;
+      (void) close_handle (here->h);
+      free (here);
+    }
+}
+
+/* Delete a thread from the list of threads */
+static void
+child_delete_thread (DWORD id)
+{
+  thread_info *th;
+
+  if (info_verbose)
+    printf_unfiltered ("[Deleting %s]\n", target_pid_to_str (id));
+  delete_thread (id);
+
+  for (th = &thread_head;
+       th->next != NULL && th->next->id != id;
+       th = th->next)
+    continue;
+
+  if (th->next != NULL)
+    {
+      thread_info *here = th->next;
+      th->next = here->next;
+      close_handle (here->h);
+      free (here);
+    }
+}
+
+static void
+check (BOOL ok, const char *file, int line)
+{
+  if (!ok)
+    printf_filtered ("error return %s:%d was %d\n", file, line, GetLastError ());
+}
+
+/* Return a pointer into a CONTEXT field indexed by gdb register number.
+   Return a pointer to an address pointing to zero if there is no
+   corresponding CONTEXT field for the given register number.
+ */
+static ULONG *
+regptr (LPCONTEXT c, int r)
+{
+  static ULONG zero = 0;
+  ULONG *p;
+  if (mappings[r] < 0)
+    p = &zero;
+  else
+    p = (ULONG *) (((char *) c) + mappings[r]);
+  return p;
+}
+
+static void
+do_child_fetch_inferior_registers (int r)
+{
+  if (r >= 0)
+    {
+      supply_register (r, (char *) regptr (&current_thread->context, r));
+    }
+  else
+    {
+      for (r = 0; r < NUM_REGS; r++)
+	do_child_fetch_inferior_registers (r);
+    }
+}
+
+static void
+child_fetch_inferior_registers (int r)
+{
+  current_thread = thread_rec (inferior_pid, TRUE);
+  do_child_fetch_inferior_registers (r);
+}
+
+static void
+do_child_store_inferior_registers (int r)
+{
+  if (r >= 0)
+    read_register_gen (r, ((char *) &current_thread->context) + mappings[r]);
+  else
+    {
+      for (r = 0; r < NUM_REGS; r++)
+	do_child_store_inferior_registers (r);
+    }
+}
+
+/* Store a new register value into the current thread context */
+static void
+child_store_inferior_registers (int r)
+{
+  current_thread = thread_rec (inferior_pid, TRUE);
+  do_child_store_inferior_registers (r);
+}
+
+/* Wait for child to do something.  Return pid of child, or -1 in case
+   of error; store status through argument pointer OURSTATUS.  */
+
+static int
+handle_load_dll (PTR dummy)
+{
+  LOAD_DLL_DEBUG_INFO *event = &current_event.u.LoadDll;
+  char dll_buf[MAX_PATH + 1];
+  char *p, *bufp, *imgp, *dll_name, *dll_basename;
+  int len;
+
+  dll_buf[0] = dll_buf[sizeof (dll_buf) - 1] = '\0';
+  if (!event->lpImageName)
+    return 1;
+
+  len = 0;
+  for (bufp = dll_buf, imgp = event->lpImageName;
+       bufp < dll_buf + sizeof (dll_buf);
+       bufp += 16, imgp += 16)
+    {
+      gdb_wince_len nbytes = 0;
+      (void) read_process_memory (current_process_handle,
+				  imgp, bufp, 16, &nbytes);
+
+      if (!nbytes && bufp == dll_buf)
+	return 1;		/* couldn't read it */
+      for (p = bufp; p < bufp + nbytes; p++)
+	{
+	  len++;
+	  if (*p == '\0')
+	    goto out;
+	  if (event->fUnicode)
+	    p++;
+	}
+      if (!nbytes)
+	break;
+    }
+
+out:
+  if (!len)
+    return 1;
+  dll_buf[len] = '\0';
+  dll_name = alloca (len);
+
+  if (!dll_name)
+    return 1;
+
+  if (!event->fUnicode)
+    memcpy (dll_name, dll_buf, len);
+  else
+    WideCharToMultiByte (CP_ACP, 0, (LPCWSTR) dll_buf, len,
+			 dll_name, len, 0, 0);
+
+  while ((p = strchr (dll_name, '\\')))
+    *p = '/';
+
+  /* FIXME!! It would be nice to define one symbol which pointed to the
+     front of the dll if we can't find any symbols. */
+
+  if (!(dll_basename = strrchr (dll_name, '/')))
+    dll_basename = dll_name;
+  else
+    dll_basename++;
+
+  /* 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.
+
+     FIXME: Is this the real reason that we need the 0x1000 ? */
+
+  printf_unfiltered ("%x:%s", event->lpBaseOfDll, dll_name);
+#if 0				/* FIXME:  Need to use RAPI stuff to read the file someday. */
+  {
+    struct section_addr_info section_addrs;
+    memset (&section_addrs, 0, sizeof (section_addrs));
+    section_addrs.text_addr = (int) event->lpBaseOfDll + 0x1000;
+    symbol_file_add (dll_name, 0, &section_addrs, 0, OBJF_SHARED);
+  }
+#endif
+  printf_unfiltered ("\n");
+
+  return 1;
+}
+
+/* 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 void
+handle_output_debug_string (struct target_waitstatus *ourstatus)
+{
+  char p[256];
+  char s[255];
+  char *q;
+  gdb_wince_len nbytes_read;
+  gdb_wince_len nbytes = current_event.u.DebugString.nDebugStringLength;
+
+  if (nbytes > 255)
+    nbytes = 255;
+
+  memset (p, 0, sizeof (p));
+  if (!read_process_memory (current_process_handle,
+			    current_event.u.DebugString.lpDebugStringData,
+			    &p, nbytes, &nbytes_read)
+      || !*p)
+    return;
+
+  memset (s, 0, sizeof (s));
+  WideCharToMultiByte (CP_ACP, 0, (LPCWSTR) p, (int) nbytes_read, s,
+		       sizeof (s) - 1, NULL, NULL);
+  q = strchr (s, '\n');
+  if (q != NULL)
+    {
+      *q = '\0';
+      if (*--q = '\r')
+	*q = '\0';
+    }
+
+  warning (s);
+  return;
+}
+
+/* Handle target exceptions. */
+static int
+handle_exception (struct target_waitstatus *ourstatus)
+{
+  thread_info *th;
+
+  if (current_event.u.Exception.dwFirstChance)
+    return 0;
+
+  ourstatus->kind = TARGET_WAITKIND_STOPPED;
+
+  /* Record the context of the current thread */
+  th = thread_rec (current_event.dwThreadId, -1);
+
+  switch (current_event.u.Exception.ExceptionRecord.ExceptionCode)
+    {
+    case EXCEPTION_ACCESS_VIOLATION:
+      DEBUG_EXCEPT (("gdb: Target exception ACCESS_VIOLATION at 0x%08x\n",
+		     (unsigned) current_event.u.Exception.ExceptionRecord.ExceptionAddress));
+      ourstatus->value.sig = TARGET_SIGNAL_SEGV;
+      break;
+    case STATUS_STACK_OVERFLOW:
+      DEBUG_EXCEPT (("gdb: Target exception STACK_OVERFLOW at 0x%08x\n",
+		     (unsigned) current_event.u.Exception.ExceptionRecord.ExceptionAddress));
+      ourstatus->value.sig = TARGET_SIGNAL_SEGV;
+      break;
+    case EXCEPTION_BREAKPOINT:
+      DEBUG_EXCEPT (("gdb: Target exception BREAKPOINT at 0x%08x\n",
+		     (unsigned) current_event.u.Exception.ExceptionRecord.ExceptionAddress));
+      ourstatus->value.sig = TARGET_SIGNAL_TRAP;
+      break;
+    case DBG_CONTROL_C:
+      DEBUG_EXCEPT (("gdb: Target exception CONTROL_C at 0x%08x\n",
+		     (unsigned) current_event.u.Exception.ExceptionRecord.ExceptionAddress));
+      ourstatus->value.sig = TARGET_SIGNAL_INT;
+      /* User typed CTRL-C.  Continue with this status */
+      last_sig = SIGINT;	/* FIXME - should check pass state */
+      break;
+    case EXCEPTION_SINGLE_STEP:
+      DEBUG_EXCEPT (("gdb: Target exception SINGLE_STEP at 0x%08x\n",
+		     (unsigned) current_event.u.Exception.ExceptionRecord.ExceptionAddress));
+      ourstatus->value.sig = TARGET_SIGNAL_TRAP;
+      break;
+    default:
+      /* This may be a structured exception handling exception.  In
+         that case, we want to let the program try to handle it, and
+         only break if we see the exception a second time.  */
+
+      printf_unfiltered ("gdb: unknown target exception 0x%08x at 0x%08x\n",
+		    current_event.u.Exception.ExceptionRecord.ExceptionCode,
+		current_event.u.Exception.ExceptionRecord.ExceptionAddress);
+      ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
+      break;
+    }
+  exception_count++;
+  return 1;
+}
+
+/* Resume all artificially suspended threads if we are continuing
+   execution */
+static BOOL
+child_continue (DWORD continue_status, int id)
+{
+  int i;
+  thread_info *th;
+  BOOL res;
+
+  DEBUG_EVENTS (("ContinueDebugEvent (cpid=%d, ctid=%d, DBG_CONTINUE);\n",
+		 (unsigned) current_event.dwProcessId, (unsigned) current_event.dwThreadId));
+  res = continue_debug_event (current_event.dwProcessId,
+			      current_event.dwThreadId,
+			      continue_status);
+  if (res)
+    for (th = &thread_head; (th = th->next) != NULL;)
+      if (((id == -1) || (id == th->id)) && th->suspend_count)
+	{
+	  for (i = 0; i < th->suspend_count; i++)
+	    (void) resume_thread (th->h);
+	  th->suspend_count = 0;
+	}
+
+  return res;
+}
+
+/* Get the next event from the child.  Return 1 if the event requires
+   handling by WFI (or whatever).
+ */
+static int
+get_child_debug_event (int pid, struct target_waitstatus *ourstatus, DWORD * event_code, int *retval)
+{
+  BOOL debug_event;
+  DWORD continue_status;
+  int breakout = 1;
+
+  if (!(debug_event = wait_for_debug_event (&current_event, 1000)))
+    {
+      breakout = *retval = *event_code = 0;
+      goto out;
+    }
+
+  this_thread = thread_rec (current_event.dwThreadId, FALSE);
+  event_count++;
+  continue_status = DBG_CONTINUE;
+  *retval = 0;
+  switch (*event_code = current_event.dwDebugEventCode)
+    {
+    case CREATE_THREAD_DEBUG_EVENT:
+      DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%x code=%s)\n",
+		     (unsigned) current_event.dwProcessId,
+		     (unsigned) current_event.dwThreadId,
+		     "CREATE_THREAD_DEBUG_EVENT"));
+      /* Record the existence of this thread */
+      child_add_thread (current_event.dwThreadId,
+			current_event.u.CreateThread.hThread);
+      if (info_verbose)
+	printf_unfiltered ("[New %s]\n",
+			   target_pid_to_str (current_event.dwThreadId));
+      break;
+
+    case EXIT_THREAD_DEBUG_EVENT:
+      DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
+		     (unsigned) current_event.dwProcessId,
+		     (unsigned) current_event.dwThreadId,
+		     "EXIT_THREAD_DEBUG_EVENT"));
+      child_delete_thread (current_event.dwThreadId);
+      break;
+
+    case CREATE_PROCESS_DEBUG_EVENT:
+      DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
+		     (unsigned) current_event.dwProcessId,
+		     (unsigned) current_event.dwThreadId,
+		     "CREATE_PROCESS_DEBUG_EVENT"));
+      current_process_handle = current_event.u.CreateProcessInfo.hProcess;
+
+      main_thread_id = inferior_pid = current_event.dwThreadId;
+      /* Add the main thread */
+      current_thread = child_add_thread (inferior_pid,
+				 current_event.u.CreateProcessInfo.hThread);
+      break;
+
+    case EXIT_PROCESS_DEBUG_EVENT:
+      DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
+		     (unsigned) current_event.dwProcessId,
+		     (unsigned) current_event.dwThreadId,
+		     "EXIT_PROCESS_DEBUG_EVENT"));
+      ourstatus->kind = TARGET_WAITKIND_EXITED;
+      ourstatus->value.integer = current_event.u.ExitProcess.dwExitCode;
+      close_handle (current_process_handle);
+      *retval = current_event.dwProcessId;
+      goto out;
+
+    case LOAD_DLL_DEBUG_EVENT:
+      DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
+		     (unsigned) current_event.dwProcessId,
+		     (unsigned) current_event.dwThreadId,
+		     "LOAD_DLL_DEBUG_EVENT"));
+      catch_errors (handle_load_dll, NULL, (char *) "", RETURN_MASK_ALL);
+      registers_changed ();	/* mark all regs invalid */
+      break;
+
+    case UNLOAD_DLL_DEBUG_EVENT:
+      DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
+		     (unsigned) current_event.dwProcessId,
+		     (unsigned) current_event.dwThreadId,
+		     "UNLOAD_DLL_DEBUG_EVENT"));
+      break;			/* FIXME: don't know what to do here */
+
+    case EXCEPTION_DEBUG_EVENT:
+      DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
+		     (unsigned) current_event.dwProcessId,
+		     (unsigned) current_event.dwThreadId,
+		     "EXCEPTION_DEBUG_EVENT"));
+      if (handle_exception (ourstatus))
+	{
+	  char buf[32];
+	  *retval = current_event.dwThreadId;
+	  remote_read_bytes (read_pc (), buf, sizeof (buf));
+	  dcache_xfer_memory (remote_dcache, read_pc (), buf, sizeof (buf), 0);
+	  goto out;
+	}
+      continue_status = DBG_EXCEPTION_NOT_HANDLED;
+      break;
+
+    case OUTPUT_DEBUG_STRING_EVENT:	/* message from the kernel */
+      DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
+		     (unsigned) current_event.dwProcessId,
+		     (unsigned) current_event.dwThreadId,
+		     "OUTPUT_DEBUG_STRING_EVENT"));
+      handle_output_debug_string (ourstatus);
+      break;
+    default:
+      printf_unfiltered ("gdb: kernel event for pid=%d tid=%d\n",
+			 current_event.dwProcessId,
+			 current_event.dwThreadId);
+      printf_unfiltered ("                 unknown event code %d\n",
+			 current_event.dwDebugEventCode);
+      break;
+    }
+
+  breakout = 0;
+  CHECK (child_continue (continue_status, -1));
+
+out:
+  return breakout;
+}
+
+/* Wait for interesting events to occur in the target process. */
+static int
+child_wait (int pid, struct target_waitstatus *ourstatus)
+{
+  DWORD event_code;
+  int retval;
+
+  /* We loop when we get a non-standard exception rather than return
+     with a SPURIOUS because resume can try and step or modify things,
+     which needs a current_thread->h.  But some of these exceptions mark
+     the birth or death of threads, which mean that the current thread
+     isn't necessarily what you think it is. */
+
+  while (1)
+    if (get_child_debug_event (pid, ourstatus, &event_code, &retval))
+      return retval;
+    else
+      {
+	int detach = 0;
+
+	if (ui_loop_hook != NULL)
+	  detach = ui_loop_hook (0);
+
+	if (detach)
+	  child_kill_inferior ();
+      }
+}
+
+/* Print status information about what we're accessing.  */
+
+static void
+child_files_info (ignore)
+     struct target_ops *ignore;
+{
+  printf_unfiltered ("\tUsing the running image of child %s.\n",
+		     target_pid_to_str (inferior_pid));
+}
+
+/* ARGSUSED */
+static void
+child_open (arg, from_tty)
+     char *arg;
+     int from_tty;
+{
+  error ("Use the \"run\" command to start a child process.");
+}
+
+#define FACTOR (0x19db1ded53ea710LL)
+#define NSPERSEC 10000000
+
+/* Convert a Win32 time to "UNIX" format. */
+long
+to_time_t (FILETIME * ptr)
+{
+  /* A file time is the number of 100ns since jan 1 1601
+     stuffed into two long words.
+     A time_t is the number of seconds since jan 1 1970.  */
+
+  long rem;
+  long long x = ((long long) ptr->dwHighDateTime << 32) + ((unsigned) ptr->dwLowDateTime);
+  x -= FACTOR;			/* number of 100ns between 1601 and 1970 */
+  rem = x % ((long long) NSPERSEC);
+  rem += (NSPERSEC / 2);
+  x /= (long long) NSPERSEC;	/* number of 100ns in a second */
+  x += (long long) (rem / NSPERSEC);
+  return x;
+}
+
+/* Upload a file to the remote device depending on the user's
+   'set remoteupload' specification. */
+char *
+upload_to_device (const char *to, const char *from)
+{
+  HANDLE h;
+  const char *dir = remote_directory ? : "\\gdb";
+  int len;
+  static char *remotefile = NULL;
+  LPWSTR wstr;
+  char *p;
+  DWORD err;
+  const char *in_to = to;
+  FILETIME ctime, atime, wtime;
+  struct stat st;
+  int fd;
+
+  /* Look for a path separator and only use trailing part. */
+  while ((p = strpbrk (to, "/\\")) != NULL)
+    to = p + 1;
+
+  if (!*to)
+    error ("no filename found to upload - %s.", in_to);
+
+  len = strlen (dir) + strlen (to) + 2;
+  remotefile = (char *) realloc (remotefile, len);
+  strcpy (remotefile, dir);
+  strcat (remotefile, "\\");
+  strcat (remotefile, to);
+
+  if (upload_when == UPLOAD_NEVER)
+    return remotefile;		/* Don't bother uploading. */
+
+  /* Open the source. */
+  if ((fd = openp (getenv ("PATH"), TRUE, (char *) from, O_RDONLY, 0, NULL)) < 0)
+    error ("couldn't open %s", from);
+
+  /* Get the time for later comparison. */
+  if (fstat (fd, &st))
+    st.st_mtime = (time_t) - 1;
+
+  /* Always attempt to create the directory on the remote system. */
+  wstr = towide (dir, NULL);
+  (void) CeCreateDirectory (wstr, NULL);
+
+  /* Attempt to open the remote file, creating it if it doesn't exist. */
+  wstr = towide (remotefile, NULL);
+  h = CeCreateFile (wstr, GENERIC_READ | GENERIC_WRITE, 0, NULL,
+		    OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
+
+  /* Some kind of problem? */
+  err = CeGetLastError ();
+  if (h == NULL)
+    error ("error creating file to \"%s\".  Windows error %d.",
+	   remotefile, err);
+
+  /* See if we need to upload the file. */
+  if (upload_when == UPLOAD_ALWAYS ||
+      err != ERROR_ALREADY_EXISTS ||
+      !CeGetFileTime (h, &ctime, &atime, &wtime) ||
+      to_time_t (&wtime) < st.st_mtime)
+    {
+      DWORD nbytes;
+      char buf[4096];
+      int n;
+
+      /* Upload the file. */
+      while ((n = read (fd, buf, sizeof (buf))) > 0)
+	if (!CeWriteFile (h, buf, (DWORD) n, &nbytes, NULL))
+	  error ("error writing to remote device - %d.",
+		 CeGetLastError ());
+    }
+
+  close (fd);
+  CeCloseHandle (h);
+
+  return remotefile;
+}
+
+/* Initialize the connection to the remote device. */
+static void
+wince_initialize ()
+{
+  int tmp;
+  char args[256];
+  char *hostname;
+  struct sockaddr_in sin;
+  char *stub_file_name;
+  int s0;
+  PROCESS_INFORMATION pi;
+
+  if (!connection_initialized)
+    switch (CeRapiInit ())
+      {
+      case 0:
+	connection_initialized = 1;
+	break;
+      default:
+	CeRapiUninit ();
+	error ("Can't initialize connection to remote device.\n");
+	break;
+      }
+
+  /* Upload the stub to the handheld device. */
+  stub_file_name = upload_to_device ("wince-stub.exe", WINCE_STUB);
+  strcpy (args, stub_file_name);
+
+  if (remote_add_host)
+    {
+      strcat (args, " ");
+      hostname = strchr (args, '\0');
+      if (gethostname (hostname, sizeof (args) - strlen (args)))
+	error ("couldn't get hostname of this system.");
+    }
+
+  /* Get a socket. */
+  if ((s0 = socket (AF_INET, SOCK_STREAM, 0)) < 0)
+    stub_error ("Couldn't connect to host system.");
+
+  /* Allow rapid reuse of the port. */
+  tmp = 1;
+  (void) setsockopt (s0, SOL_SOCKET, SO_REUSEADDR, (char *) &tmp, sizeof (tmp));
+
+
+  /* Set up the information for connecting to the host gdb process. */
+  memset (&sin, 0, sizeof (sin));
+  sin.sin_family = AF_INET;
+  sin.sin_port = htons (7000);	/* FIXME: This should be configurable */
+
+  if (bind (s0, (struct sockaddr *) &sin, sizeof (sin)))
+    error ("couldn't bind socket");
+
+  if (listen (s0, 1))
+    error ("Couldn't open socket for listening.\n");
+
+  /* Start up the stub on the remote device. */
+  if (!CeCreateProcess (towide (stub_file_name, NULL), towide (args, NULL),
+			NULL, NULL, 0, 0, NULL, NULL, NULL, &pi))
+    error ("Unable to start remote stub '%s'.  Windows CE error %d.",
+	   stub_file_name, CeGetLastError ());
+
+  /* Wait for a connection */
+
+  if ((s = accept (s0, NULL, NULL)) < 0)
+    error ("couldn't set up server for connection.");
+
+  close (s0);
+}
+
+/* Start an inferior win32 child process and sets inferior_pid to its pid.
+   EXEC_FILE is the file to run.
+   ALLARGS is a string containing the arguments to the program.
+   ENV is the environment vector to pass.  Errors reported with error().  */
+static void
+child_create_inferior (char *exec_file, char *args, char **env)
+{
+  PROCESS_INFORMATION pi;
+  struct target_waitstatus dummy;
+  int ret;
+  DWORD flags, event_code;
+  char *exec_and_args;
+
+  if (!exec_file)
+    error ("No executable specified, use `target exec'.\n");
+
+  flags = DEBUG_PROCESS;
+
+  wince_initialize ();		/* Make sure we've got a connection. */
+  if (!remote_dcache)
+    remote_dcache = dcache_init (remote_read_bytes, remote_write_bytes);
+  else
+    dcache_flush (remote_dcache);
+
+  exec_file = upload_to_device (exec_file, exec_file);
+
+  while (*args == ' ')
+    args++;
+
+  /* Allocate space for "command<sp>args" */
+  if (*args == '\0')
+    {
+      exec_and_args = alloca (strlen (exec_file) + 1);
+      strcpy (exec_and_args, exec_file);
+    }
+  else
+    {
+      exec_and_args = alloca (strlen (exec_file + strlen (args) + 2));
+      sprintf (exec_and_args, "%s %s", exec_file, args);
+    }
+
+  memset (&pi, 0, sizeof (pi));
+  /* Execute the process */
+  if (!create_process (exec_file, exec_and_args, flags, &pi))
+    error ("Error creating process %s, (error %d)\n", exec_file, GetLastError ());
+
+  exception_count = 0;
+  event_count = 0;
+
+  current_process_handle = pi.hProcess;
+  current_event.dwProcessId = pi.dwProcessId;
+  memset (&current_event, 0, sizeof (current_event));
+  inferior_pid = current_event.dwThreadId = pi.dwThreadId;
+  push_target (&child_ops);
+  child_init_thread_list ();
+  child_add_thread (pi.dwThreadId, pi.hThread);
+  init_wait_for_inferior ();
+  clear_proceed_status ();
+  target_terminal_init ();
+  target_terminal_inferior ();
+
+
+  /* Run until process and threads are loaded */
+  do
+    get_child_debug_event (inferior_pid, &dummy, &event_code, &ret);
+  while (event_code != CREATE_PROCESS_DEBUG_EVENT);
+
+  proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0);
+}
+
+/* Chile has gone bye-bye. */
+static void
+child_mourn_inferior ()
+{
+  (void) child_continue (DBG_CONTINUE, -1);
+  unpush_target (&child_ops);
+  stop_stub ();
+  CeRapiUninit ();
+  connection_initialized = 0;
+  generic_mourn_inferior ();
+}
+
+/* Move memory from child to/from gdb. */
+int
+child_xfer_memory (CORE_ADDR memaddr, char *our, int len,
+		   int write, struct target_ops *target)
+{
+  if (len <= 0)
+    return 0;
+  return dcache_xfer_memory (remote_dcache, memaddr, our, len, write);
+}
+
+/* Terminate the process and wait for child to tell us it has completed. */
+void
+child_kill_inferior (void)
+{
+  CHECK (terminate_process (current_process_handle));
+
+  for (;;)
+    {
+      if (!child_continue (DBG_CONTINUE, -1))
+	break;
+      if (!wait_for_debug_event (&current_event, INFINITE))
+	break;
+      if (current_event.dwDebugEventCode == EXIT_PROCESS_DEBUG_EVENT)
+	break;
+    }
+
+  CHECK (close_handle (current_process_handle));
+  close_handle (current_thread->h);
+  target_mourn_inferior ();	/* or just child_mourn_inferior? */
+}
+
+#ifdef MIPS
+static void
+undoSStep (thread_info * th)
+{
+  if (th->stepped)
+    {
+      memory_remove_breakpoint (th->step_pc, (void *) &th->step_prev);
+      th->stepped = 0;
+    }
+}
+
+void
+wince_software_single_step (unsigned int ignore, int insert_breakpoints_p)
+{
+  unsigned long pc;
+  thread_info *th = current_thread;	/* Info on currently selected thread */
+  CORE_ADDR mips_next_pc (CORE_ADDR pc);
+
+  if (!insert_breakpoints_p)
+    {
+      undoSStep (th);
+      return;
+    }
+
+  th->stepped = 1;
+  pc = read_register (PC_REGNUM);
+  th->step_pc = mips_next_pc (pc);
+  th->step_prev = 0;
+  memory_insert_breakpoint (th->step_pc, (void *) &th->step_prev);
+}
+#elif SHx
+/* Hitachi SH architecture instruction encoding masks */
+
+#define COND_BR_MASK   0xff00
+#define UCOND_DBR_MASK 0xe000
+#define UCOND_RBR_MASK 0xf0df
+#define TRAPA_MASK     0xff00
+
+#define COND_DISP      0x00ff
+#define UCOND_DISP     0x0fff
+#define UCOND_REG      0x0f00
+
+/* Hitachi SH instruction opcodes */
+
+#define BF_INSTR       0x8b00
+#define BT_INSTR       0x8900
+#define BRA_INSTR      0xa000
+#define BSR_INSTR      0xb000
+#define JMP_INSTR      0x402b
+#define JSR_INSTR      0x400b
+#define RTS_INSTR      0x000b
+#define RTE_INSTR      0x002b
+#define TRAPA_INSTR    0xc300
+#define SSTEP_INSTR    0xc3ff
+
+
+#define T_BIT_MASK     0x0001
+
+/* Undo the effect of a previous doSStep.  If we single stepped,
+   restore the old instruction. */
+
+static void
+undoSStep (thread_info * th)
+{
+  if (th->stepped)
+    {
+      gdb_wince_len done;
+      write_process_memory (current_process_handle, (LPVOID) th->step_pc,
+			  (LPVOID) & th->step_instr, sizeof (short), &done);
+      if (done != sizeof (short))
+	  error ("error unsetting single step.");
+      th->stepped = 0;
+    }
+}
+
+/* Single step (in a painstaking fashion) by inspecting the current
+   instruction and setting a breakpoint on the "next" instruction
+   which would be executed.  This code hails from sh-stub.c.
+ */
+void
+wince_software_single_step (unsigned int ignore, int insert_breakpoints_p)
+{
+  thread_info *th = current_thread;	/* Info on currently selected thread */
+
+  if (!insert_breakpoints_p)
+    undoSStep (th);
+  else
+    {
+      short *instrMem;
+      int displacement;
+      int reg;
+      unsigned short opcode;
+      gdb_wince_len done;
+      LPCONTEXT c = &th->context;
+
+      instrMem = (short *) c->Fir;
+
+      read_process_memory (current_process_handle, (LPCVOID) c->Fir, &opcode,
+			   sizeof (opcode), &done);
+      if (done != sizeof (opcode))
+	error ("couldn't retrieve opcode");
+      th->stepped = 1;
+
+      if ((opcode & COND_BR_MASK) == BT_INSTR)
+	{
+	  if (c->Psr & T_BIT_MASK)
+	    {
+	      displacement = (opcode & COND_DISP) << 1;
+	      if (displacement & 0x80)
+		displacement |= 0xffffff00;
+	      /*
+	         * Remember PC points to second instr.
+	         * after PC of branch ... so add 4
+	       */
+	      instrMem = (short *) (c->Fir + displacement + 4);
+	    }
+	  else
+	    instrMem += 1;
+	}
+      else if ((opcode & COND_BR_MASK) == BF_INSTR)
+	{
+	  if (c->Psr & T_BIT_MASK)
+	    instrMem += 1;
+	  else
+	    {
+	      displacement = (opcode & COND_DISP) << 1;
+	      if (displacement & 0x80)
+		displacement |= 0xffffff00;
+	      /*
+	         * Remember PC points to second instr.
+	         * after PC of branch ... so add 4
+	       */
+	      instrMem = (short *) (c->Fir + displacement + 4);
+	    }
+	}
+      else if ((opcode & UCOND_DBR_MASK) == BRA_INSTR)
+	{
+	  displacement = (opcode & UCOND_DISP) << 1;
+	  if (displacement & 0x0800)
+	    displacement |= 0xfffff000;
+
+	  /*
+	     * Remember PC points to second instr.
+	     * after PC of branch ... so add 4
+	   */
+	  instrMem = (short *) (c->Fir + displacement + 4);
+	}
+      else if ((opcode & UCOND_RBR_MASK) == JSR_INSTR)
+	{
+	  reg = (char) ((opcode & UCOND_REG) >> 8);
+
+	  instrMem = (short *) *regptr (c, reg);
+	}
+      else if (opcode == RTS_INSTR)
+	instrMem = (short *) c->PR;
+      else if (opcode == RTE_INSTR)
+	instrMem = (short *) *regptr (c, 15);
+      else if ((opcode & TRAPA_MASK) == TRAPA_INSTR)
+	instrMem = (short *) ((opcode & ~TRAPA_MASK) << 2);
+      else
+	instrMem += 1;
+
+      th->step_pc = (CORE_ADDR) instrMem;
+
+      read_process_memory (current_process_handle, (LPVOID) instrMem,
+			   (LPVOID) & th->step_instr, sizeof (short), &done);
+      opcode = SSTEP_INSTR;
+      write_process_memory (current_process_handle, (LPVOID) instrMem,
+			    (LPVOID) & opcode, sizeof (short), &done);
+    }
+}
+#elif defined (ARM)
+/* Single step (in a painstaking fashion) by inspecting the current
+   instruction and setting a breakpoint on the "next" instruction
+   which would be executed.  This code hails from sh-stub.c.
+ */
+static void
+undoSStep (thread_info * th)
+{
+  if (th->stepped)
+    {
+      memory_remove_breakpoint (th->step_pc, (void *) &th->step_prev);
+      th->stepped = 0;
+    }
+}
+
+void
+wince_software_single_step (unsigned int ignore, int insert_breakpoints_p)
+{
+  unsigned long pc;
+  thread_info *th = current_thread;	/* Info on currently selected thread */
+  CORE_ADDR mips_next_pc (CORE_ADDR pc);
+
+  if (!insert_breakpoints_p)
+    {
+      undoSStep (th);
+      return;
+    }
+
+  th->stepped = 1;
+  pc = read_register (PC_REGNUM);
+  th->step_pc = arm_get_next_pc (pc);
+  th->step_prev = 0;
+  memory_insert_breakpoint (th->step_pc, (void *) &th->step_prev);
+}
+#endif
+
+/* Resume the child after an exception. */
+void
+child_resume (int pid, int step, enum target_signal sig)
+{
+  thread_info *th;
+  DWORD continue_status = last_sig > 0 && last_sig < NSIG ?
+  DBG_EXCEPTION_NOT_HANDLED : DBG_CONTINUE;
+
+  DEBUG_EXEC (("gdb: child_resume (pid=%d, step=%d, sig=%d);\n",
+	       pid, step, sig));
+
+  /* Get context for currently selected thread */
+  th = thread_rec (current_event.dwThreadId, FALSE);
+
+  if (th->context.ContextFlags)
+    {
+      CHECK (set_thread_context (th->h, &th->context));
+      th->context.ContextFlags = 0;
+    }
+
+  dcache_flush (remote_dcache);
+
+  /* Allow continuing with the same signal that interrupted us.
+     Otherwise complain. */
+  if (sig && sig != last_sig)
+    fprintf_unfiltered (gdb_stderr, "Can't send signals to the child.  signal %d\n", sig);
+
+  last_sig = 0;
+  child_continue (continue_status, pid);
+}
+
+static void
+child_prepare_to_store ()
+{
+  /* Do nothing, since we can store individual regs */
+}
+
+static int
+child_can_run ()
+{
+  return 1;
+}
+
+static void
+child_close ()
+{
+  DEBUG_EVENTS (("gdb: child_close, inferior_pid=%d\n", inferior_pid));
+}
+
+/* Explicitly upload file to remotedir */
+
+static void
+child_load (char *file, int from_tty)
+{
+  upload_to_device (file, file);
+}
+
+struct target_ops child_ops;
+
+static void
+init_child_ops (void)
+{
+  memset (&child_ops, 0, sizeof (child_ops));
+  child_ops.to_shortname = (char *) "child";
+  child_ops.to_longname = (char *) "Windows CE process";
+  child_ops.to_doc = (char *) "Windows CE process (started by the \"run\" command).";
+  child_ops.to_open = child_open;
+  child_ops.to_close = child_close;
+  child_ops.to_resume = child_resume;
+  child_ops.to_wait = child_wait;
+  child_ops.to_fetch_registers = child_fetch_inferior_registers;
+  child_ops.to_store_registers = child_store_inferior_registers;
+  child_ops.to_prepare_to_store = child_prepare_to_store;
+  child_ops.to_xfer_memory = child_xfer_memory;
+  child_ops.to_files_info = child_files_info;
+  child_ops.to_insert_breakpoint = memory_insert_breakpoint;
+  child_ops.to_remove_breakpoint = memory_remove_breakpoint;
+  child_ops.to_terminal_init = terminal_init_inferior;
+  child_ops.to_terminal_inferior = terminal_inferior;
+  child_ops.to_terminal_ours_for_output = terminal_ours_for_output;
+  child_ops.to_terminal_ours = terminal_ours;
+  child_ops.to_terminal_info = child_terminal_info;
+  child_ops.to_kill = child_kill_inferior;
+  child_ops.to_load = child_load;
+  child_ops.to_create_inferior = child_create_inferior;
+  child_ops.to_mourn_inferior = child_mourn_inferior;
+  child_ops.to_can_run = child_can_run;
+  child_ops.to_thread_alive = win32_child_thread_alive;
+  child_ops.to_stratum = process_stratum;
+  child_ops.to_has_all_memory = 1;
+  child_ops.to_has_memory = 1;
+  child_ops.to_has_stack = 1;
+  child_ops.to_has_registers = 1;
+  child_ops.to_has_execution = 1;
+  child_ops.to_sections = 0;
+  child_ops.to_sections_end = 0;
+  child_ops.to_magic = OPS_MAGIC;
+}
+
+
+/* Handle 'set remoteupload' parameter. */
+
+#define replace_upload(what) \
+      upload_when = UPLOAD_NEWER; \
+      remote_upload = realloc (remote_upload, strlen (upload_options[upload_when].name)); \
+      strcpy (remote_upload, upload_options[upload_when].name);
+
+static void
+set_upload_type (char *ignore, int from_tty)
+{
+  int i, len;
+  char *bad_option;
+
+  if (!remote_upload || !remote_upload[0])
+    {
+      replace_upload (UPLOAD_NEWER);
+      if (from_tty)
+	printf_unfiltered ("Upload upload_options are: always, newer, never.\n");
+      return;
+    }
+
+  len = strlen (remote_upload);
+  for (i = 0; i < (sizeof (upload_options) / sizeof (upload_options[0])); i++)
+    if (len >= upload_options[i].abbrev &&
+	strncasecmp (remote_upload, upload_options[i].name, len) == 0)
+      {
+	remote_upload = (char *) upload_options[i].name;
+	upload_when = i;
+	return;
+      }
+
+  bad_option = remote_upload;
+  replace_upload (UPLOAD_NEWER);
+  error ("Unknown upload type: %s.", bad_option);
+}
+
+void
+_initialize_inftarg ()
+{
+  struct cmd_list_element *set;
+  init_child_ops ();
+
+  add_show_from_set
+    (add_set_cmd ((char *) "remotedirectory", no_class,
+		  var_string_noescape, (char *) &remote_directory,
+		  (char *) "Set directory for remote upload.\n",
+		  &setlist),
+     &showlist);
+  remote_directory = xstrdup (remote_directory);
+
+  set = add_set_cmd ((char *) "remoteupload", no_class,
+		     var_string_noescape, (char *) &remote_upload,
+	       (char *) "Set how to upload executables to remote device.\n",
+		     &setlist);
+  add_show_from_set (set, &showlist);
+  set->function.cfunc = set_upload_type;
+  set_upload_type (NULL, 0);
+  set_dcache_state (1);
+
+  add_show_from_set
+    (add_set_cmd ((char *) "debugexec", class_support, var_boolean,
+		  (char *) &debug_exec,
+	      (char *) "Set whether to display execution in child process.",
+		  &setlist),
+     &showlist);
+
+  add_show_from_set
+    (add_set_cmd ((char *) "remoteaddhost", class_support, var_boolean,
+		  (char *) &remote_add_host,
+		  (char *) "Set whether to add this host to remote stub arguments for\n
+debugging over a network.", &setlist),
+     &showlist);
+
+  add_show_from_set
+    (add_set_cmd ((char *) "debugevents", class_support, var_boolean,
+		  (char *) &debug_events,
+	  (char *) "Set whether to display kernel events in child process.",
+		  &setlist),
+     &showlist);
+
+  add_show_from_set
+    (add_set_cmd ((char *) "debugmemory", class_support, var_boolean,
+		  (char *) &debug_memory,
+	(char *) "Set whether to display memory accesses in child process.",
+		  &setlist),
+     &showlist);
+
+  add_show_from_set
+    (add_set_cmd ((char *) "debugexceptions", class_support, var_boolean,
+		  (char *) &debug_exceptions,
+      (char *) "Set whether to display kernel exceptions in child process.",
+		  &setlist),
+     &showlist);
+
+  add_target (&child_ops);
+}
+
+/* Determine if the thread referenced by "pid" is alive
+   by "polling" it.  If WaitForSingleObject returns WAIT_OBJECT_0
+   it means that the pid has died.  Otherwise it is assumed to be alive. */
+static int
+win32_child_thread_alive (int pid)
+{
+  return thread_alive (thread_rec (pid, FALSE)->h);
+}
+
+/* Convert pid to printable format. */
+char *
+cygwin_pid_to_str (int pid)
+{
+  static char buf[80];
+  if (pid == current_event.dwProcessId)
+    sprintf (buf, "process %d", pid);
+  else
+    sprintf (buf, "thread %d.0x%x", (unsigned) current_event.dwProcessId, pid);
+  return buf;
+}