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/* Copyright (C) 2007, 2008, 2009, 2010 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 "i386-low.h"

#define FCS_REGNUM 27

#define FOP_REGNUM 31

#define FLAG_TRACE_BIT 0x100

/* Defined in auto-generated file reg-i386.c.  */

void init_registers_i386 (void);

static struct i386_debug_reg_state debug_reg_state;

static int debug_registers_changed = 0;

static int debug_registers_used = 0;

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

void

i386_dr_low_set_addr (const struct i386_debug_reg_state *state, int regnum)

{

  if (! (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR))

    fatal ("Invalid debug register %d", regnum);

  /* debug_reg_state.dr_mirror is already set.

     Just notify i386_set_thread_context, i386_thread_added

     that the registers need to be updated.  */

  debug_registers_changed = 1;

  debug_registers_used = 1;

}

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

void

i386_dr_low_set_control (const struct i386_debug_reg_state *state)

{

  /* debug_reg_state.dr_control_mirror is already set.

     Just notify i386_set_thread_context, i386_thread_added

     that the registers need to be updated.  */

  debug_registers_changed = 1;

  debug_registers_used = 1;

}

/* Get the value of the DR6 debug status register from the inferior

   and record it in STATE.  */

void

i386_dr_low_get_status (struct i386_debug_reg_state *state)

{

  /* We don't need to do anything here, the last call to thread_rec for

     current_event.dwThreadId id has already set it.  */

}

/* Watchpoint support.  */

static int

i386_insert_point (char type, CORE_ADDR addr, int len)

{

  switch (type)

    {

    case '2':

    case '3':

    case '4':

      return i386_low_insert_watchpoint (&debug_reg_state,

                                         type, addr, len);

    default:

      /* Unsupported.  */

      return 1;

    }

}

static int

i386_remove_point (char type, CORE_ADDR addr, int len)

{

  switch (type)

    {

    case '2':

    case '3':

    case '4':

      return i386_low_remove_watchpoint (&debug_reg_state,

                                         type, addr, len);

    default:

      /* Unsupported.  */

      return 1;

    }

}

static int

i386_stopped_by_watchpoint (void)

{

  return i386_low_stopped_by_watchpoint (&debug_reg_state);

}

static CORE_ADDR

i386_stopped_data_address (void)

{

  CORE_ADDR addr;

  if (i386_low_stopped_data_address (&debug_reg_state, &addr))

    return addr;

  return 0;

}

static void

i386_initial_stuff (void)

{

  i386_low_init_dregs (&debug_reg_state);

  debug_registers_changed = 0;

  debug_registers_used = 0;

}

static void

i386_get_thread_context (win32_thread_info *th, DEBUG_EVENT* current_event)

{

  /* 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);

    }

  debug_registers_changed = 0;

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

    {

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

      struct i386_debug_reg_state *dr = &debug_reg_state;

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

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

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

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

      dr->dr_status_mirror = th->context.Dr6;

      dr->dr_control_mirror = th->context.Dr7;

    }

}

static void

i386_set_thread_context (win32_thread_info *th, DEBUG_EVENT* current_event)

{

  if (debug_registers_changed)

    {

      struct i386_debug_reg_state *dr = &debug_reg_state;

      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;

    }

  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)

    {

      struct i386_debug_reg_state *dr = &debug_reg_state;

      th->context.ContextFlags = CONTEXT_DEBUG_REGISTERS;

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

      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;

      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 (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

struct win32_target_ops the_low_target = {

  init_registers_i386,

  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,

  &i386_win32_breakpoint,

  i386_win32_breakpoint_len,

  i386_insert_point,

  i386_remove_point,

  i386_stopped_by_watchpoint,

  i386_stopped_data_address

};