[deliverable/binutils-gdb.git] / gdbserver / win32-i386-low.cc

/* Copyright (C) 2007-2020 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "server.h"
#include "win32-low.h"
#include "x86-low.h"
#include "gdbsupport/x86-xstate.h"
#ifdef __x86_64__
#include "arch/amd64.h"
#endif
#include "arch/i386.h"
#include "tdesc.h"
#include "x86-tdesc.h"

using namespace windows_nat;

#ifndef CONTEXT_EXTENDED_REGISTERS
#define CONTEXT_EXTENDED_REGISTERS 0
#endif

#define FCS_REGNUM 27
#define FOP_REGNUM 31

#define FLAG_TRACE_BIT 0x100

static struct x86_debug_reg_state debug_reg_state;

static void
update_debug_registers (thread_info *thread)
{
  windows_thread_info *th = (windows_thread_info *) thread_target_data (thread);

  /* The actual update is done later just before resuming the lwp,
     we just mark that the registers need updating.  */
  th->debug_registers_changed = true;
}

/* Update the inferior's debug register REGNUM from STATE.  */

static void
x86_dr_low_set_addr (int regnum, CORE_ADDR addr)
{
  gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);

  /* Only update the threads of this process.  */
  for_each_thread (current_thread->id.pid (), update_debug_registers);
}

/* Update the inferior's DR7 debug control register from STATE.  */

static void
x86_dr_low_set_control (unsigned long control)
{
  /* Only update the threads of this process.  */
  for_each_thread (current_thread->id.pid (), update_debug_registers);
}

/* Return the current value of a DR register of the current thread's
   context.  */

static DWORD64
win32_get_current_dr (int dr)
{
  windows_thread_info *th
    = (windows_thread_info *) thread_target_data (current_thread);

  win32_require_context (th);

#define RET_DR(DR)				\
  case DR:					\
    return th->context.Dr ## DR

  switch (dr)
    {
      RET_DR (0);
      RET_DR (1);
      RET_DR (2);
      RET_DR (3);
      RET_DR (6);
      RET_DR (7);
    }

#undef RET_DR

  gdb_assert_not_reached ("unhandled dr");
}

static CORE_ADDR
x86_dr_low_get_addr (int regnum)
{
  gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);

  return win32_get_current_dr (regnum - DR_FIRSTADDR);
}

static unsigned long
x86_dr_low_get_control (void)
{
  return win32_get_current_dr (7);
}

/* Get the value of the DR6 debug status register from the inferior
   and record it in STATE.  */

static unsigned long
x86_dr_low_get_status (void)
{
  return win32_get_current_dr (6);
}

/* Low-level function vector.  */
struct x86_dr_low_type x86_dr_low =
  {
    x86_dr_low_set_control,
    x86_dr_low_set_addr,
    x86_dr_low_get_addr,
    x86_dr_low_get_status,
    x86_dr_low_get_control,
    sizeof (void *),
  };

/* Breakpoint/watchpoint support.  */

static int
i386_supports_z_point_type (char z_type)
{
  switch (z_type)
    {
    case Z_PACKET_WRITE_WP:
    case Z_PACKET_ACCESS_WP:
      return 1;
    default:
      return 0;
    }
}

static int
i386_insert_point (enum raw_bkpt_type type, CORE_ADDR addr,
		   int size, struct raw_breakpoint *bp)
{
  switch (type)
    {
    case raw_bkpt_type_write_wp:
    case raw_bkpt_type_access_wp:
      {
	enum target_hw_bp_type hw_type
	  = raw_bkpt_type_to_target_hw_bp_type (type);

	return x86_dr_insert_watchpoint (&debug_reg_state,
					 hw_type, addr, size);
      }
    default:
      /* Unsupported.  */
      return 1;
    }
}

static int
i386_remove_point (enum raw_bkpt_type type, CORE_ADDR addr,
		   int size, struct raw_breakpoint *bp)
{
  switch (type)
    {
    case raw_bkpt_type_write_wp:
    case raw_bkpt_type_access_wp:
      {
	enum target_hw_bp_type hw_type
	  = raw_bkpt_type_to_target_hw_bp_type (type);

	return x86_dr_remove_watchpoint (&debug_reg_state,
					 hw_type, addr, size);
      }
    default:
      /* Unsupported.  */
      return 1;
    }
}

static int
x86_stopped_by_watchpoint (void)
{
  return x86_dr_stopped_by_watchpoint (&debug_reg_state);
}

static CORE_ADDR
x86_stopped_data_address (void)
{
  CORE_ADDR addr;
  if (x86_dr_stopped_data_address (&debug_reg_state, &addr))
    return addr;
  return 0;
}

static void
i386_initial_stuff (void)
{
  x86_low_init_dregs (&debug_reg_state);
}

static void
i386_get_thread_context (windows_thread_info *th)
{
  /* Requesting the CONTEXT_EXTENDED_REGISTERS register set fails if
     the system doesn't support extended registers.  */
  static DWORD extended_registers = CONTEXT_EXTENDED_REGISTERS;

 again:
  th->context.ContextFlags = (CONTEXT_FULL
			      | CONTEXT_FLOATING_POINT
			      | CONTEXT_DEBUG_REGISTERS
			      | extended_registers);

  if (!GetThreadContext (th->h, &th->context))
    {
      DWORD e = GetLastError ();

      if (extended_registers && e == ERROR_INVALID_PARAMETER)
	{
	  extended_registers = 0;
	  goto again;
	}

      error ("GetThreadContext failure %ld\n", (long) e);
    }
}

static void
i386_prepare_to_resume (windows_thread_info *th)
{
  if (th->debug_registers_changed)
    {
      struct x86_debug_reg_state *dr = &debug_reg_state;

      win32_require_context (th);

      th->context.Dr0 = dr->dr_mirror[0];
      th->context.Dr1 = dr->dr_mirror[1];
      th->context.Dr2 = dr->dr_mirror[2];
      th->context.Dr3 = dr->dr_mirror[3];
      /* th->context.Dr6 = dr->dr_status_mirror;
	 FIXME: should we set dr6 also ?? */
      th->context.Dr7 = dr->dr_control_mirror;

      th->debug_registers_changed = false;
    }
}

static void
i386_thread_added (windows_thread_info *th)
{
  th->debug_registers_changed = true;
}

static void
i386_single_step (windows_thread_info *th)
{
  th->context.EFlags |= FLAG_TRACE_BIT;
}

#ifndef __x86_64__

/* 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.  In this case regptr will return
   a pointer into a dummy register.  */
#define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
static const int mappings[] = {
  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]),
  context_offset (FloatSave.ControlWord),
  context_offset (FloatSave.StatusWord),
  context_offset (FloatSave.TagWord),
  context_offset (FloatSave.ErrorSelector),
  context_offset (FloatSave.ErrorOffset),
  context_offset (FloatSave.DataSelector),
  context_offset (FloatSave.DataOffset),
  context_offset (FloatSave.ErrorSelector),
  /* XMM0-7 */
  context_offset (ExtendedRegisters[10 * 16]),
  context_offset (ExtendedRegisters[11 * 16]),
  context_offset (ExtendedRegisters[12 * 16]),
  context_offset (ExtendedRegisters[13 * 16]),
  context_offset (ExtendedRegisters[14 * 16]),
  context_offset (ExtendedRegisters[15 * 16]),
  context_offset (ExtendedRegisters[16 * 16]),
  context_offset (ExtendedRegisters[17 * 16]),
  /* MXCSR */
  context_offset (ExtendedRegisters[24])
};
#undef context_offset

#else /* __x86_64__ */

#define context_offset(x) (offsetof (CONTEXT, x))
static const int mappings[] =
{
  context_offset (Rax),
  context_offset (Rbx),
  context_offset (Rcx),
  context_offset (Rdx),
  context_offset (Rsi),
  context_offset (Rdi),
  context_offset (Rbp),
  context_offset (Rsp),
  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 (Rip),
  context_offset (EFlags),
  context_offset (SegCs),
  context_offset (SegSs),
  context_offset (SegDs),
  context_offset (SegEs),
  context_offset (SegFs),
  context_offset (SegGs),
  context_offset (FloatSave.FloatRegisters[0]),
  context_offset (FloatSave.FloatRegisters[1]),
  context_offset (FloatSave.FloatRegisters[2]),
  context_offset (FloatSave.FloatRegisters[3]),
  context_offset (FloatSave.FloatRegisters[4]),
  context_offset (FloatSave.FloatRegisters[5]),
  context_offset (FloatSave.FloatRegisters[6]),
  context_offset (FloatSave.FloatRegisters[7]),
  context_offset (FloatSave.ControlWord),
  context_offset (FloatSave.StatusWord),
  context_offset (FloatSave.TagWord),
  context_offset (FloatSave.ErrorSelector),
  context_offset (FloatSave.ErrorOffset),
  context_offset (FloatSave.DataSelector),
  context_offset (FloatSave.DataOffset),
  context_offset (FloatSave.ErrorSelector)
  /* XMM0-7 */ ,
  context_offset (Xmm0),
  context_offset (Xmm1),
  context_offset (Xmm2),
  context_offset (Xmm3),
  context_offset (Xmm4),
  context_offset (Xmm5),
  context_offset (Xmm6),
  context_offset (Xmm7),
  context_offset (Xmm8),
  context_offset (Xmm9),
  context_offset (Xmm10),
  context_offset (Xmm11),
  context_offset (Xmm12),
  context_offset (Xmm13),
  context_offset (Xmm14),
  context_offset (Xmm15),
  /* MXCSR */
  context_offset (FloatSave.MxCsr)
};
#undef context_offset

#endif /* __x86_64__ */

/* Fetch register from gdbserver regcache data.  */
static void
i386_fetch_inferior_register (struct regcache *regcache,
			      windows_thread_info *th, int r)
{
  char *context_offset = (char *) &th->context + mappings[r];

  long l;
  if (r == FCS_REGNUM)
    {
      l = *((long *) context_offset) & 0xffff;
      supply_register (regcache, r, (char *) &l);
    }
  else if (r == FOP_REGNUM)
    {
      l = (*((long *) context_offset) >> 16) & ((1 << 11) - 1);
      supply_register (regcache, r, (char *) &l);
    }
  else
    supply_register (regcache, r, context_offset);
}

/* Store a new register value into the thread context of TH.  */
static void
i386_store_inferior_register (struct regcache *regcache,
			      windows_thread_info *th, int r)
{
  char *context_offset = (char *) &th->context + mappings[r];
  collect_register (regcache, r, context_offset);
}

static const unsigned char i386_win32_breakpoint = 0xcc;
#define i386_win32_breakpoint_len 1

static void
i386_arch_setup (void)
{
  struct target_desc *tdesc;

#ifdef __x86_64__
  tdesc = amd64_create_target_description (X86_XSTATE_SSE_MASK, false,
					   false, false);
  const char **expedite_regs = amd64_expedite_regs;
#else
  tdesc = i386_create_target_description (X86_XSTATE_SSE_MASK, false, false);
  const char **expedite_regs = i386_expedite_regs;
#endif

  init_target_desc (tdesc, expedite_regs);

  win32_tdesc = tdesc;
}

struct win32_target_ops the_low_target = {
  i386_arch_setup,
  sizeof (mappings) / sizeof (mappings[0]),
  i386_initial_stuff,
  i386_get_thread_context,
  i386_prepare_to_resume,
  i386_thread_added,
  i386_fetch_inferior_register,
  i386_store_inferior_register,
  i386_single_step,
  &i386_win32_breakpoint,
  i386_win32_breakpoint_len,
  i386_supports_z_point_type,
  i386_insert_point,
  i386_remove_point,
  x86_stopped_by_watchpoint,
  x86_stopped_data_address
};
Commit	Line	Data
	1	/* Copyright (C) 2007-2020 Free Software Foundation, Inc.
	2
	3	This file is part of GDB.
	4
	5	This program is free software; you can redistribute it and/or modify
	6	it under the terms of the GNU General Public License as published by
	7	the Free Software Foundation; either version 3 of the License, or
	8	(at your option) any later version.
	9
	10	This program is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	GNU General Public License for more details.
	14
	15	You should have received a copy of the GNU General Public License
	16	along with this program. If not, see <http://www.gnu.org/licenses/>. */
	17
	18	#include "server.h"
	19	#include "win32-low.h"
	20	#include "x86-low.h"
	21	#include "gdbsupport/x86-xstate.h"
	22	#ifdef __x86_64__
	23	#include "arch/amd64.h"
	24	#endif
	25	#include "arch/i386.h"
	26	#include "tdesc.h"
	27	#include "x86-tdesc.h"
	28
	29	using namespace windows_nat;
	30
	31	#ifndef CONTEXT_EXTENDED_REGISTERS
	32	#define CONTEXT_EXTENDED_REGISTERS 0
	33	#endif
	34
	35	#define FCS_REGNUM 27
	36	#define FOP_REGNUM 31
	37
	38	#define FLAG_TRACE_BIT 0x100
	39
	40	static struct x86_debug_reg_state debug_reg_state;
	41
	42	static void
	43	update_debug_registers (thread_info *thread)
	44	{
	45	windows_thread_info th = (windows_thread_info ) thread_target_data (thread);
	46
	47	/* The actual update is done later just before resuming the lwp,
	48	we just mark that the registers need updating. */
	49	th->debug_registers_changed = true;
	50	}
	51
	52	/* Update the inferior's debug register REGNUM from STATE. */
	53
	54	static void
	55	x86_dr_low_set_addr (int regnum, CORE_ADDR addr)
	56	{
	57	gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
	58
	59	/* Only update the threads of this process. */
	60	for_each_thread (current_thread->id.pid (), update_debug_registers);
	61	}
	62
	63	/* Update the inferior's DR7 debug control register from STATE. */
	64
	65	static void
	66	x86_dr_low_set_control (unsigned long control)
	67	{
	68	/* Only update the threads of this process. */
	69	for_each_thread (current_thread->id.pid (), update_debug_registers);
	70	}
	71
	72	/* Return the current value of a DR register of the current thread's
	73	context. */
	74
	75	static DWORD64
	76	win32_get_current_dr (int dr)
	77	{
	78	windows_thread_info *th
	79	= (windows_thread_info *) thread_target_data (current_thread);
	80
	81	win32_require_context (th);
	82
	83	#define RET_DR(DR) \
	84	case DR: \
	85	return th->context.Dr ## DR
	86
	87	switch (dr)
	88	{
	89	RET_DR (0);
	90	RET_DR (1);
	91	RET_DR (2);
	92	RET_DR (3);
	93	RET_DR (6);
	94	RET_DR (7);
	95	}
	96
	97	#undef RET_DR
	98
	99	gdb_assert_not_reached ("unhandled dr");
	100	}
	101
	102	static CORE_ADDR
	103	x86_dr_low_get_addr (int regnum)
	104	{
	105	gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
	106
	107	return win32_get_current_dr (regnum - DR_FIRSTADDR);
	108	}
	109
	110	static unsigned long
	111	x86_dr_low_get_control (void)
	112	{
	113	return win32_get_current_dr (7);
	114	}
	115
	116	/* Get the value of the DR6 debug status register from the inferior
	117	and record it in STATE. */
	118
	119	static unsigned long
	120	x86_dr_low_get_status (void)
	121	{
	122	return win32_get_current_dr (6);
	123	}
	124
	125	/* Low-level function vector. */
	126	struct x86_dr_low_type x86_dr_low =
	127	{
	128	x86_dr_low_set_control,
	129	x86_dr_low_set_addr,
	130	x86_dr_low_get_addr,
	131	x86_dr_low_get_status,
	132	x86_dr_low_get_control,
	133	sizeof (void *),
	134	};
	135
	136	/* Breakpoint/watchpoint support. */
	137
	138	static int
	139	i386_supports_z_point_type (char z_type)
	140	{
	141	switch (z_type)
	142	{
	143	case Z_PACKET_WRITE_WP:
	144	case Z_PACKET_ACCESS_WP:
	145	return 1;
	146	default:
	147	return 0;
	148	}
	149	}
	150
	151	static int
	152	i386_insert_point (enum raw_bkpt_type type, CORE_ADDR addr,
	153	int size, struct raw_breakpoint *bp)
	154	{
	155	switch (type)
	156	{
	157	case raw_bkpt_type_write_wp:
	158	case raw_bkpt_type_access_wp:
	159	{
	160	enum target_hw_bp_type hw_type
	161	= raw_bkpt_type_to_target_hw_bp_type (type);
	162
	163	return x86_dr_insert_watchpoint (&debug_reg_state,
	164	hw_type, addr, size);
	165	}
	166	default:
	167	/* Unsupported. */
	168	return 1;
	169	}
	170	}
	171
	172	static int
	173	i386_remove_point (enum raw_bkpt_type type, CORE_ADDR addr,
	174	int size, struct raw_breakpoint *bp)
	175	{
	176	switch (type)
	177	{
	178	case raw_bkpt_type_write_wp:
	179	case raw_bkpt_type_access_wp:
	180	{
	181	enum target_hw_bp_type hw_type
	182	= raw_bkpt_type_to_target_hw_bp_type (type);
	183
	184	return x86_dr_remove_watchpoint (&debug_reg_state,
	185	hw_type, addr, size);
	186	}
	187	default:
	188	/* Unsupported. */
	189	return 1;
	190	}
	191	}
	192
	193	static int
	194	x86_stopped_by_watchpoint (void)
	195	{
	196	return x86_dr_stopped_by_watchpoint (&debug_reg_state);
	197	}
	198
	199	static CORE_ADDR
	200	x86_stopped_data_address (void)
	201	{
	202	CORE_ADDR addr;
	203	if (x86_dr_stopped_data_address (&debug_reg_state, &addr))
	204	return addr;
	205	return 0;
	206	}
	207
	208	static void
	209	i386_initial_stuff (void)
	210	{
	211	x86_low_init_dregs (&debug_reg_state);
	212	}
	213
	214	static void
	215	i386_get_thread_context (windows_thread_info *th)
	216	{
	217	/* Requesting the CONTEXT_EXTENDED_REGISTERS register set fails if
	218	the system doesn't support extended registers. */
	219	static DWORD extended_registers = CONTEXT_EXTENDED_REGISTERS;
	220
	221	again:
	222	th->context.ContextFlags = (CONTEXT_FULL
	223	\| CONTEXT_FLOATING_POINT
	224	\| CONTEXT_DEBUG_REGISTERS
	225	\| extended_registers);
	226
	227	if (!GetThreadContext (th->h, &th->context))
	228	{
	229	DWORD e = GetLastError ();
	230
	231	if (extended_registers && e == ERROR_INVALID_PARAMETER)
	232	{
	233	extended_registers = 0;
	234	goto again;
	235	}
	236
	237	error ("GetThreadContext failure %ld\n", (long) e);
	238	}
	239	}
	240
	241	static void
	242	i386_prepare_to_resume (windows_thread_info *th)
	243	{
	244	if (th->debug_registers_changed)
	245	{
	246	struct x86_debug_reg_state *dr = &debug_reg_state;
	247
	248	win32_require_context (th);
	249
	250	th->context.Dr0 = dr->dr_mirror[0];
	251	th->context.Dr1 = dr->dr_mirror[1];
	252	th->context.Dr2 = dr->dr_mirror[2];
	253	th->context.Dr3 = dr->dr_mirror[3];
	254	/* th->context.Dr6 = dr->dr_status_mirror;
	255	FIXME: should we set dr6 also ?? */
	256	th->context.Dr7 = dr->dr_control_mirror;
	257
	258	th->debug_registers_changed = false;
	259	}
	260	}
	261
	262	static void
	263	i386_thread_added (windows_thread_info *th)
	264	{
	265	th->debug_registers_changed = true;
	266	}
	267
	268	static void
	269	i386_single_step (windows_thread_info *th)
	270	{
	271	th->context.EFlags \|= FLAG_TRACE_BIT;
	272	}
	273
	274	#ifndef __x86_64__
	275
	276	/* An array of offset mappings into a Win32 Context structure.
	277	This is a one-to-one mapping which is indexed by gdb's register
	278	numbers. It retrieves an offset into the context structure where
	279	the 4 byte register is located.
	280	An offset value of -1 indicates that Win32 does not provide this
	281	register in it's CONTEXT structure. In this case regptr will return
	282	a pointer into a dummy register. */
	283	#define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
	284	static const int mappings[] = {
	285	context_offset (Eax),
	286	context_offset (Ecx),
	287	context_offset (Edx),
	288	context_offset (Ebx),
	289	context_offset (Esp),
	290	context_offset (Ebp),
	291	context_offset (Esi),
	292	context_offset (Edi),
	293	context_offset (Eip),
	294	context_offset (EFlags),
	295	context_offset (SegCs),
	296	context_offset (SegSs),
	297	context_offset (SegDs),
	298	context_offset (SegEs),
	299	context_offset (SegFs),
	300	context_offset (SegGs),
	301	context_offset (FloatSave.RegisterArea[0 * 10]),
	302	context_offset (FloatSave.RegisterArea[1 * 10]),
	303	context_offset (FloatSave.RegisterArea[2 * 10]),
	304	context_offset (FloatSave.RegisterArea[3 * 10]),
	305	context_offset (FloatSave.RegisterArea[4 * 10]),
	306	context_offset (FloatSave.RegisterArea[5 * 10]),
	307	context_offset (FloatSave.RegisterArea[6 * 10]),
	308	context_offset (FloatSave.RegisterArea[7 * 10]),
	309	context_offset (FloatSave.ControlWord),
	310	context_offset (FloatSave.StatusWord),
	311	context_offset (FloatSave.TagWord),
	312	context_offset (FloatSave.ErrorSelector),
	313	context_offset (FloatSave.ErrorOffset),
	314	context_offset (FloatSave.DataSelector),
	315	context_offset (FloatSave.DataOffset),
	316	context_offset (FloatSave.ErrorSelector),
	317	/* XMM0-7 */
	318	context_offset (ExtendedRegisters[10 * 16]),
	319	context_offset (ExtendedRegisters[11 * 16]),
	320	context_offset (ExtendedRegisters[12 * 16]),
	321	context_offset (ExtendedRegisters[13 * 16]),
	322	context_offset (ExtendedRegisters[14 * 16]),
	323	context_offset (ExtendedRegisters[15 * 16]),
	324	context_offset (ExtendedRegisters[16 * 16]),
	325	context_offset (ExtendedRegisters[17 * 16]),
	326	/* MXCSR */
	327	context_offset (ExtendedRegisters[24])
	328	};
	329	#undef context_offset
	330
	331	#else /* __x86_64__ */
	332
	333	#define context_offset(x) (offsetof (CONTEXT, x))
	334	static const int mappings[] =
	335	{
	336	context_offset (Rax),
	337	context_offset (Rbx),
	338	context_offset (Rcx),
	339	context_offset (Rdx),
	340	context_offset (Rsi),
	341	context_offset (Rdi),
	342	context_offset (Rbp),
	343	context_offset (Rsp),
	344	context_offset (R8),
	345	context_offset (R9),
	346	context_offset (R10),
	347	context_offset (R11),
	348	context_offset (R12),
	349	context_offset (R13),
	350	context_offset (R14),
	351	context_offset (R15),
	352	context_offset (Rip),
	353	context_offset (EFlags),
	354	context_offset (SegCs),
	355	context_offset (SegSs),
	356	context_offset (SegDs),
	357	context_offset (SegEs),
	358	context_offset (SegFs),
	359	context_offset (SegGs),
	360	context_offset (FloatSave.FloatRegisters[0]),
	361	context_offset (FloatSave.FloatRegisters[1]),
	362	context_offset (FloatSave.FloatRegisters[2]),
	363	context_offset (FloatSave.FloatRegisters[3]),
	364	context_offset (FloatSave.FloatRegisters[4]),
	365	context_offset (FloatSave.FloatRegisters[5]),
	366	context_offset (FloatSave.FloatRegisters[6]),
	367	context_offset (FloatSave.FloatRegisters[7]),
	368	context_offset (FloatSave.ControlWord),
	369	context_offset (FloatSave.StatusWord),
	370	context_offset (FloatSave.TagWord),
	371	context_offset (FloatSave.ErrorSelector),
	372	context_offset (FloatSave.ErrorOffset),
	373	context_offset (FloatSave.DataSelector),
	374	context_offset (FloatSave.DataOffset),
	375	context_offset (FloatSave.ErrorSelector)
	376	/* XMM0-7 */ ,
	377	context_offset (Xmm0),
	378	context_offset (Xmm1),
	379	context_offset (Xmm2),
	380	context_offset (Xmm3),
	381	context_offset (Xmm4),
	382	context_offset (Xmm5),
	383	context_offset (Xmm6),
	384	context_offset (Xmm7),
	385	context_offset (Xmm8),
	386	context_offset (Xmm9),
	387	context_offset (Xmm10),
	388	context_offset (Xmm11),
	389	context_offset (Xmm12),
	390	context_offset (Xmm13),
	391	context_offset (Xmm14),
	392	context_offset (Xmm15),
	393	/* MXCSR */
	394	context_offset (FloatSave.MxCsr)
	395	};
	396	#undef context_offset
	397
	398	#endif /* __x86_64__ */
	399
	400	/* Fetch register from gdbserver regcache data. */
	401	static void
	402	i386_fetch_inferior_register (struct regcache *regcache,
	403	windows_thread_info *th, int r)
	404	{
	405	char context_offset = (char ) &th->context + mappings[r];
	406
	407	long l;
	408	if (r == FCS_REGNUM)
	409	{
	410	l = ((long ) context_offset) & 0xffff;
	411	supply_register (regcache, r, (char *) &l);
	412	}
	413	else if (r == FOP_REGNUM)
	414	{
	415	l = (((long ) context_offset) >> 16) & ((1 << 11) - 1);
	416	supply_register (regcache, r, (char *) &l);
	417	}
	418	else
	419	supply_register (regcache, r, context_offset);
	420	}
	421
	422	/* Store a new register value into the thread context of TH. */
	423	static void
	424	i386_store_inferior_register (struct regcache *regcache,
	425	windows_thread_info *th, int r)
	426	{
	427	char context_offset = (char ) &th->context + mappings[r];
	428	collect_register (regcache, r, context_offset);
	429	}
	430
	431	static const unsigned char i386_win32_breakpoint = 0xcc;
	432	#define i386_win32_breakpoint_len 1
	433
	434	static void
	435	i386_arch_setup (void)
	436	{
	437	struct target_desc *tdesc;
	438
	439	#ifdef __x86_64__
	440	tdesc = amd64_create_target_description (X86_XSTATE_SSE_MASK, false,
	441	false, false);
	442	const char **expedite_regs = amd64_expedite_regs;
	443	#else
	444	tdesc = i386_create_target_description (X86_XSTATE_SSE_MASK, false, false);
	445	const char **expedite_regs = i386_expedite_regs;
	446	#endif
	447
	448	init_target_desc (tdesc, expedite_regs);
	449
	450	win32_tdesc = tdesc;
	451	}
	452
	453	struct win32_target_ops the_low_target = {
	454	i386_arch_setup,
	455	sizeof (mappings) / sizeof (mappings[0]),
	456	i386_initial_stuff,
	457	i386_get_thread_context,
	458	i386_prepare_to_resume,
	459	i386_thread_added,
	460	i386_fetch_inferior_register,
	461	i386_store_inferior_register,
	462	i386_single_step,
	463	&i386_win32_breakpoint,
	464	i386_win32_breakpoint_len,
	465	i386_supports_z_point_type,
	466	i386_insert_point,
	467	i386_remove_point,
	468	x86_stopped_by_watchpoint,
	469	x86_stopped_data_address
	470	};