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/* Copyright (C) 2007, 2008 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"

#define FCS_REGNUM 27

#define FOP_REGNUM 31

#define FLAG_TRACE_BIT 0x100

static unsigned dr[8];

static int debug_registers_changed = 0;

static int debug_registers_used = 0;

static void

i386_initial_stuff (void)

{

  memset (&dr, 0, sizeof (dr));

  debug_registers_changed = 0;

  debug_registers_used = 0;

}

static void

i386_get_thread_context (win32_thread_info *th, DEBUG_EVENT* current_event)

{

  th->context.ContextFlags = \

    CONTEXT_FULL | \

    CONTEXT_FLOATING_POINT | \

    CONTEXT_EXTENDED_REGISTERS | \

    CONTEXT_DEBUG_REGISTERS;

  GetThreadContext (th->h, &th->context);

  debug_registers_changed = 0;

  if (th->tid == current_event->dwThreadId)

    {

      /* Copy dr values from the current thread.  */

      dr[0] = th->context.Dr0;

      dr[1] = th->context.Dr1;

      dr[2] = th->context.Dr2;

      dr[3] = th->context.Dr3;

      dr[6] = th->context.Dr6;

      dr[7] = th->context.Dr7;

    }

}

static void

i386_set_thread_context (win32_thread_info *th, DEBUG_EVENT* current_event)

{

  if (debug_registers_changed)

    {

      th->context.Dr0 = dr[0];

      th->context.Dr1 = dr[1];

      th->context.Dr2 = dr[2];

      th->context.Dr3 = dr[3];

      /* th->context.Dr6 = dr[6];

         FIXME: should we set dr6 also ?? */

      th->context.Dr7 = dr[7];

    }

  SetThreadContext (th->h, &th->context);

}

static void

i386_thread_added (win32_thread_info *th)

{

  /* Set the debug registers for the new thread if they are used.  */

  if (debug_registers_used)

    {

      th->context.ContextFlags = CONTEXT_DEBUG_REGISTERS;

      GetThreadContext (th->h, &th->context);

      th->context.Dr0 = dr[0];

      th->context.Dr1 = dr[1];

      th->context.Dr2 = dr[2];

      th->context.Dr3 = dr[3];

      /* th->context.Dr6 = dr[6];

         FIXME: should we set dr6 also ?? */

      th->context.Dr7 = dr[7];

      SetThreadContext (th->h, &th->context);

      th->context.ContextFlags = 0;

    }

}

static void

i386_single_step (win32_thread_info *th)

{

  th->context.EFlags |= FLAG_TRACE_BIT;

}

/* 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

/* Fetch register from gdbserver regcache data.  */

static void

i386_fetch_inferior_register (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 (r, (char *) &l);

    }

  else if (r == FOP_REGNUM)

    {

      l = (*((long *) context_offset) >> 16) & ((1 << 11) - 1);

      supply_register (r, (char *) &l);

    }

  else

    supply_register (r, context_offset);

}

/* Store a new register value into the thread context of TH.  */

static void

i386_store_inferior_register (win32_thread_info *th, int r)

{

  char *context_offset = (char *) &th->context + mappings[r];

  collect_register (r, context_offset);

}

struct win32_target_ops the_low_target = {

  sizeof (mappings) / sizeof (mappings[0]),

  i386_initial_stuff,

  i386_get_thread_context,

  i386_set_thread_context,

  i386_thread_added,

  i386_fetch_inferior_register,

  i386_store_inferior_register,

  i386_single_step,

  NULL, /* breakpoint */

  0, /* breakpoint_len */

  "i386" /* arch_string */

};