[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"

#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)
{
  win32_thread_info *th = (win32_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 = 1;
}

/* 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)
{
  win32_thread_info *th
    = (win32_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 (win32_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 (win32_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 = 0;
    }
}

static void
i386_thread_added (win32_thread_info *th)
{
  th->debug_registers_changed = 1;
}

static void
i386_single_step (win32_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,
			      win32_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,
			      win32_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
b811d2c2	1	/* Copyright (C) 2007-2020 Free Software Foundation, Inc.
68070c10 PA	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
a9762ec7	7	the Free Software Foundation; either version 3 of the License, or
68070c10 PA	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
a9762ec7	16	along with this program. If not, see <http://www.gnu.org/licenses/>. */
68070c10 PA	17
	18	#include "server.h"
	19	#include "win32-low.h"
df7e5265	20	#include "x86-low.h"
268a13a5	21	#include "gdbsupport/x86-xstate.h"
22916b07 YQ	22	#ifdef __x86_64__
	23	#include "arch/amd64.h"
	24	#endif
	25	#include "arch/i386.h"
cc4d742f	26	#include "tdesc.h"
190852c8	27	#include "x86-tdesc.h"
68070c10	28
54709339 PM	29	#ifndef CONTEXT_EXTENDED_REGISTERS
	30	#define CONTEXT_EXTENDED_REGISTERS 0
	31	#endif
	32
68070c10 PA	33	#define FCS_REGNUM 27
	34	#define FOP_REGNUM 31
	35
	36	#define FLAG_TRACE_BIT 0x100
	37
df7e5265	38	static struct x86_debug_reg_state debug_reg_state;
68070c10	39
0b360f19 SM	40	static void
0b360f19 SM	41	update_debug_registers (thread_info *thread)
a2abc7de	42	{
0b360f19	43	win32_thread_info th = (win32_thread_info ) thread_target_data (thread);
a2abc7de	44
0b360f19 SM	45	/* The actual update is done later just before resuming the lwp,
	46	we just mark that the registers need updating. */
	47	th->debug_registers_changed = 1;
a2abc7de	48	}
34b34921	49
aa5ca48f DE	50	/* Update the inferior's debug register REGNUM from STATE. */
aa5ca48f DE	51
42995dbd	52	static void
df7e5265	53	x86_dr_low_set_addr (int regnum, CORE_ADDR addr)
aa5ca48f	54	{
0a5b1e09	55	gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
964e4306	56
0b360f19 SM	57	/* Only update the threads of this process. */
0b360f19 SM	58	for_each_thread (current_thread->id.pid (), update_debug_registers);
964e4306 PA	59	}
964e4306 PA	60
aa5ca48f DE	61	/* Update the inferior's DR7 debug control register from STATE. */
aa5ca48f DE	62
42995dbd	63	static void
df7e5265	64	x86_dr_low_set_control (unsigned long control)
aa5ca48f	65	{
a2abc7de	66	/* Only update the threads of this process. */
0b360f19	67	for_each_thread (current_thread->id.pid (), update_debug_registers);
a2abc7de PA	68	}
	69
	70	/* Return the current value of a DR register of the current thread's
	71	context. */
	72
	73	static DWORD64
	74	win32_get_current_dr (int dr)
	75	{
c3de4d92	76	win32_thread_info *th
6afd337d	77	= (win32_thread_info *) thread_target_data (current_thread);
a2abc7de PA	78
	79	win32_require_context (th);
	80
	81	#define RET_DR(DR) \
	82	case DR: \
	83	return th->context.Dr ## DR
	84
	85	switch (dr)
	86	{
	87	RET_DR (0);
	88	RET_DR (1);
	89	RET_DR (2);
	90	RET_DR (3);
	91	RET_DR (6);
	92	RET_DR (7);
	93	}
	94
	95	#undef RET_DR
	96
	97	gdb_assert_not_reached ("unhandled dr");
	98	}
	99
	100	static CORE_ADDR
	101	x86_dr_low_get_addr (int regnum)
	102	{
	103	gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
	104
	105	return win32_get_current_dr (regnum - DR_FIRSTADDR);
aa5ca48f DE	106	}
aa5ca48f DE	107
42995dbd	108	static unsigned long
df7e5265	109	x86_dr_low_get_control (void)
964e4306	110	{
a2abc7de	111	return win32_get_current_dr (7);
964e4306 PA	112	}
964e4306 PA	113
aa5ca48f DE	114	/* Get the value of the DR6 debug status register from the inferior
	115	and record it in STATE. */
	116
42995dbd	117	static unsigned long
df7e5265	118	x86_dr_low_get_status (void)
aa5ca48f	119	{
a2abc7de	120	return win32_get_current_dr (6);
aa5ca48f DE	121	}
aa5ca48f DE	122
42995dbd	123	/* Low-level function vector. */
df7e5265	124	struct x86_dr_low_type x86_dr_low =
42995dbd	125	{
df7e5265 GB	126	x86_dr_low_set_control,
	127	x86_dr_low_set_addr,
	128	x86_dr_low_get_addr,
	129	x86_dr_low_get_status,
	130	x86_dr_low_get_control,
42995dbd GB	131	sizeof (void *),
	132	};
	133
802e8e6d	134	/* Breakpoint/watchpoint support. */
aa5ca48f DE	135
aa5ca48f DE	136	static int
802e8e6d PA	137	i386_supports_z_point_type (char z_type)
	138	{
	139	switch (z_type)
	140	{
	141	case Z_PACKET_WRITE_WP:
	142	case Z_PACKET_ACCESS_WP:
	143	return 1;
	144	default:
	145	return 0;
	146	}
	147	}
	148
	149	static int
	150	i386_insert_point (enum raw_bkpt_type type, CORE_ADDR addr,
	151	int size, struct raw_breakpoint *bp)
aa5ca48f DE	152	{
	153	switch (type)
	154	{
802e8e6d PA	155	case raw_bkpt_type_write_wp:
802e8e6d PA	156	case raw_bkpt_type_access_wp:
a4165e94	157	{
802e8e6d PA	158	enum target_hw_bp_type hw_type
802e8e6d PA	159	= raw_bkpt_type_to_target_hw_bp_type (type);
a4165e94	160
df7e5265 GB	161	return x86_dr_insert_watchpoint (&debug_reg_state,
df7e5265 GB	162	hw_type, addr, size);
a4165e94	163	}
aa5ca48f DE	164	default:
	165	/* Unsupported. */
	166	return 1;
	167	}
	168	}
	169
	170	static int
802e8e6d PA	171	i386_remove_point (enum raw_bkpt_type type, CORE_ADDR addr,
802e8e6d PA	172	int size, struct raw_breakpoint *bp)
aa5ca48f DE	173	{
	174	switch (type)
	175	{
802e8e6d PA	176	case raw_bkpt_type_write_wp:
802e8e6d PA	177	case raw_bkpt_type_access_wp:
a4165e94	178	{
802e8e6d PA	179	enum target_hw_bp_type hw_type
802e8e6d PA	180	= raw_bkpt_type_to_target_hw_bp_type (type);
a4165e94	181
df7e5265 GB	182	return x86_dr_remove_watchpoint (&debug_reg_state,
df7e5265 GB	183	hw_type, addr, size);
a4165e94	184	}
aa5ca48f DE	185	default:
	186	/* Unsupported. */
	187	return 1;
	188	}
	189	}
	190
	191	static int
df7e5265	192	x86_stopped_by_watchpoint (void)
aa5ca48f	193	{
df7e5265	194	return x86_dr_stopped_by_watchpoint (&debug_reg_state);
aa5ca48f DE	195	}
	196
	197	static CORE_ADDR
df7e5265	198	x86_stopped_data_address (void)
aa5ca48f DE	199	{
aa5ca48f DE	200	CORE_ADDR addr;
df7e5265	201	if (x86_dr_stopped_data_address (&debug_reg_state, &addr))
aa5ca48f DE	202	return addr;
	203	return 0;
	204	}
	205
68070c10	206	static void
34b34921	207	i386_initial_stuff (void)
68070c10	208	{
df7e5265	209	x86_low_init_dregs (&debug_reg_state);
68070c10 PA	210	}
	211
	212	static void
a2abc7de	213	i386_get_thread_context (win32_thread_info *th)
68070c10	214	{
912cf4ba PA	215	/* Requesting the CONTEXT_EXTENDED_REGISTERS register set fails if
	216	the system doesn't support extended registers. */
	217	static DWORD extended_registers = CONTEXT_EXTENDED_REGISTERS;
34b34921	218
912cf4ba PA	219	again:
	220	th->context.ContextFlags = (CONTEXT_FULL
	221	\| CONTEXT_FLOATING_POINT
	222	\| CONTEXT_DEBUG_REGISTERS
	223	\| extended_registers);
	224
	225	if (!GetThreadContext (th->h, &th->context))
	226	{
	227	DWORD e = GetLastError ();
	228
	229	if (extended_registers && e == ERROR_INVALID_PARAMETER)
	230	{
	231	extended_registers = 0;
	232	goto again;
	233	}
	234
	235	error ("GetThreadContext failure %ld\n", (long) e);
	236	}
68070c10 PA	237	}
	238
	239	static void
a2abc7de	240	i386_prepare_to_resume (win32_thread_info *th)
68070c10	241	{
a2abc7de	242	if (th->debug_registers_changed)
34b34921	243	{
df7e5265	244	struct x86_debug_reg_state *dr = &debug_reg_state;
a2abc7de PA	245
	246	win32_require_context (th);
	247
aa5ca48f DE	248	th->context.Dr0 = dr->dr_mirror[0];
	249	th->context.Dr1 = dr->dr_mirror[1];
	250	th->context.Dr2 = dr->dr_mirror[2];
	251	th->context.Dr3 = dr->dr_mirror[3];
8d26e50c	252	/* th->context.Dr6 = dr->dr_status_mirror;
34b34921	253	FIXME: should we set dr6 also ?? */
8d26e50c	254	th->context.Dr7 = dr->dr_control_mirror;
34b34921	255
a2abc7de PA	256	th->debug_registers_changed = 0;
a2abc7de PA	257	}
68070c10 PA	258	}
68070c10 PA	259
68070c10	260	static void
34b34921	261	i386_thread_added (win32_thread_info *th)
68070c10	262	{
a2abc7de	263	th->debug_registers_changed = 1;
68070c10 PA	264	}
	265
	266	static void
34b34921	267	i386_single_step (win32_thread_info *th)
68070c10 PA	268	{
	269	th->context.EFlags \|= FLAG_TRACE_BIT;
	270	}
	271
1c07cc19	272	#ifndef __x86_64__
54709339	273
68070c10 PA	274	/* An array of offset mappings into a Win32 Context structure.
	275	This is a one-to-one mapping which is indexed by gdb's register
	276	numbers. It retrieves an offset into the context structure where
	277	the 4 byte register is located.
	278	An offset value of -1 indicates that Win32 does not provide this
	279	register in it's CONTEXT structure. In this case regptr will return
	280	a pointer into a dummy register. */
	281	#define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
	282	static const int mappings[] = {
	283	context_offset (Eax),
	284	context_offset (Ecx),
	285	context_offset (Edx),
	286	context_offset (Ebx),
	287	context_offset (Esp),
	288	context_offset (Ebp),
	289	context_offset (Esi),
	290	context_offset (Edi),
	291	context_offset (Eip),
	292	context_offset (EFlags),
	293	context_offset (SegCs),
	294	context_offset (SegSs),
	295	context_offset (SegDs),
	296	context_offset (SegEs),
	297	context_offset (SegFs),
	298	context_offset (SegGs),
	299	context_offset (FloatSave.RegisterArea[0 * 10]),
	300	context_offset (FloatSave.RegisterArea[1 * 10]),
	301	context_offset (FloatSave.RegisterArea[2 * 10]),
	302	context_offset (FloatSave.RegisterArea[3 * 10]),
	303	context_offset (FloatSave.RegisterArea[4 * 10]),
	304	context_offset (FloatSave.RegisterArea[5 * 10]),
	305	context_offset (FloatSave.RegisterArea[6 * 10]),
	306	context_offset (FloatSave.RegisterArea[7 * 10]),
	307	context_offset (FloatSave.ControlWord),
	308	context_offset (FloatSave.StatusWord),
	309	context_offset (FloatSave.TagWord),
	310	context_offset (FloatSave.ErrorSelector),
	311	context_offset (FloatSave.ErrorOffset),
	312	context_offset (FloatSave.DataSelector),
	313	context_offset (FloatSave.DataOffset),
	314	context_offset (FloatSave.ErrorSelector),
	315	/* XMM0-7 */
	316	context_offset (ExtendedRegisters[10 * 16]),
	317	context_offset (ExtendedRegisters[11 * 16]),
	318	context_offset (ExtendedRegisters[12 * 16]),
	319	context_offset (ExtendedRegisters[13 * 16]),
	320	context_offset (ExtendedRegisters[14 * 16]),
	321	context_offset (ExtendedRegisters[15 * 16]),
	322	context_offset (ExtendedRegisters[16 * 16]),
	323	context_offset (ExtendedRegisters[17 * 16]),
	324	/* MXCSR */
	325	context_offset (ExtendedRegisters[24])
	326	};
	327	#undef context_offset
	328
1c07cc19	329	#else /* __x86_64__ */
54709339 PM	330
	331	#define context_offset(x) (offsetof (CONTEXT, x))
	332	static const int mappings[] =
	333	{
	334	context_offset (Rax),
	335	context_offset (Rbx),
	336	context_offset (Rcx),
	337	context_offset (Rdx),
	338	context_offset (Rsi),
	339	context_offset (Rdi),
	340	context_offset (Rbp),
	341	context_offset (Rsp),
	342	context_offset (R8),
	343	context_offset (R9),
	344	context_offset (R10),
	345	context_offset (R11),
	346	context_offset (R12),
	347	context_offset (R13),
	348	context_offset (R14),
	349	context_offset (R15),
	350	context_offset (Rip),
	351	context_offset (EFlags),
	352	context_offset (SegCs),
	353	context_offset (SegSs),
	354	context_offset (SegDs),
	355	context_offset (SegEs),
	356	context_offset (SegFs),
	357	context_offset (SegGs),
	358	context_offset (FloatSave.FloatRegisters[0]),
	359	context_offset (FloatSave.FloatRegisters[1]),
	360	context_offset (FloatSave.FloatRegisters[2]),
	361	context_offset (FloatSave.FloatRegisters[3]),
	362	context_offset (FloatSave.FloatRegisters[4]),
	363	context_offset (FloatSave.FloatRegisters[5]),
	364	context_offset (FloatSave.FloatRegisters[6]),
	365	context_offset (FloatSave.FloatRegisters[7]),
	366	context_offset (FloatSave.ControlWord),
	367	context_offset (FloatSave.StatusWord),
	368	context_offset (FloatSave.TagWord),
	369	context_offset (FloatSave.ErrorSelector),
	370	context_offset (FloatSave.ErrorOffset),
	371	context_offset (FloatSave.DataSelector),
	372	context_offset (FloatSave.DataOffset),
	373	context_offset (FloatSave.ErrorSelector)
	374	/* XMM0-7 */ ,
	375	context_offset (Xmm0),
	376	context_offset (Xmm1),
	377	context_offset (Xmm2),
	378	context_offset (Xmm3),
	379	context_offset (Xmm4),
	380	context_offset (Xmm5),
	381	context_offset (Xmm6),
	382	context_offset (Xmm7),
	383	context_offset (Xmm8),
	384	context_offset (Xmm9),
	385	context_offset (Xmm10),
	386	context_offset (Xmm11),
	387	context_offset (Xmm12),
	388	context_offset (Xmm13),
	389	context_offset (Xmm14),
	390	context_offset (Xmm15),
	391	/* MXCSR */
	392	context_offset (FloatSave.MxCsr)
	393	};
394	#undef context_offset
395
1c07cc19	396	#endif /* __x86_64__ */
54709339	397
34b34921 PA	398	/* Fetch register from gdbserver regcache data. */
34b34921 PA	399	static void
442ea881 PA	400	i386_fetch_inferior_register (struct regcache *regcache,
442ea881 PA	401	win32_thread_info *th, int r)
34b34921 PA	402	{
	403	char context_offset = (char ) &th->context + mappings[r];
	404
	405	long l;
	406	if (r == FCS_REGNUM)
	407	{
	408	l = ((long ) context_offset) & 0xffff;
442ea881	409	supply_register (regcache, r, (char *) &l);
34b34921 PA	410	}
	411	else if (r == FOP_REGNUM)
	412	{
	413	l = (((long ) context_offset) >> 16) & ((1 << 11) - 1);
442ea881	414	supply_register (regcache, r, (char *) &l);
34b34921 PA	415	}
34b34921 PA	416	else
442ea881	417	supply_register (regcache, r, context_offset);
34b34921 PA	418	}
	419
	420	/* Store a new register value into the thread context of TH. */
	421	static void
442ea881 PA	422	i386_store_inferior_register (struct regcache *regcache,
442ea881 PA	423	win32_thread_info *th, int r)
34b34921 PA	424	{
34b34921 PA	425	char context_offset = (char ) &th->context + mappings[r];
442ea881	426	collect_register (regcache, r, context_offset);
34b34921 PA	427	}
34b34921 PA	428
912cf4ba PA	429	static const unsigned char i386_win32_breakpoint = 0xcc;
	430	#define i386_win32_breakpoint_len 1
	431
54709339	432	static void
3aee8918	433	i386_arch_setup (void)
54709339	434	{
cc4d742f SM	435	struct target_desc *tdesc;
cc4d742f SM	436
1c07cc19	437	#ifdef __x86_64__
cc4d742f	438	tdesc = amd64_create_target_description (X86_XSTATE_SSE_MASK, false,
de52b960	439	false, false);
190852c8	440	const char **expedite_regs = amd64_expedite_regs;
54709339	441	#else
1163a4b7	442	tdesc = i386_create_target_description (X86_XSTATE_SSE_MASK, false, false);
190852c8	443	const char **expedite_regs = i386_expedite_regs;
54709339	444	#endif
cc4d742f	445
190852c8	446	init_target_desc (tdesc, expedite_regs);
cc4d742f SM	447
cc4d742f SM	448	win32_tdesc = tdesc;
54709339 PM	449	}
54709339 PM	450
68070c10	451	struct win32_target_ops the_low_target = {
3aee8918	452	i386_arch_setup,
68070c10	453	sizeof (mappings) / sizeof (mappings[0]),
34b34921 PA	454	i386_initial_stuff,
34b34921 PA	455	i386_get_thread_context,
a2abc7de	456	i386_prepare_to_resume,
34b34921 PA	457	i386_thread_added,
	458	i386_fetch_inferior_register,
	459	i386_store_inferior_register,
	460	i386_single_step,
912cf4ba PA	461	&i386_win32_breakpoint,
912cf4ba PA	462	i386_win32_breakpoint_len,
802e8e6d	463	i386_supports_z_point_type,
aa5ca48f DE	464	i386_insert_point,
aa5ca48f DE	465	i386_remove_point,
df7e5265 GB	466	x86_stopped_by_watchpoint,
df7e5265 GB	467	x86_stopped_data_address
68070c10	468	};