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/* Native-dependent code for AMD64.

   Copyright (C) 2003, 2004, 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 "defs.h"

#include "gdbarch.h"

#include "regcache.h"

#include "gdb_assert.h"

#include "gdb_string.h"

#include "i386-tdep.h"

#include "amd64-tdep.h"

/* The following bits of code help with implementing debugging 32-bit

   code natively on AMD64.  The idea is to define two mappings between

   the register number as used by GDB and the register set used by the

   host to represent the general-purpose registers; one for 32-bit

   code and one for 64-bit code.  The mappings are specified by the

   follwing variables and consist of an array of offsets within the

   register set indexed by register number, and the number of

   registers supported by the mapping.  We don't need mappings for the

   floating-point and SSE registers, since the difference between

   64-bit and 32-bit variants are negligable.  The difference in the

   number of SSE registers is already handled by the target code.  */

/* General-purpose register mapping for native 32-bit code.  */

int *amd64_native_gregset32_reg_offset;

int amd64_native_gregset32_num_regs = I386_NUM_GREGS;

/* General-purpose register mapping for native 64-bit code.  */

int *amd64_native_gregset64_reg_offset;

int amd64_native_gregset64_num_regs = AMD64_NUM_GREGS;

/* Return the offset of REGNUM within the appropriate native

   general-purpose register set.  */

static int

amd64_native_gregset_reg_offset (struct gdbarch *gdbarch, int regnum)

{

  int *reg_offset = amd64_native_gregset64_reg_offset;

  int num_regs = amd64_native_gregset64_num_regs;

  gdb_assert (regnum >= 0);

  if (gdbarch_ptr_bit (gdbarch) == 32)

    {

      reg_offset = amd64_native_gregset32_reg_offset;

      num_regs = amd64_native_gregset32_num_regs;

    }

  if (num_regs > gdbarch_num_regs (gdbarch))

    num_regs = gdbarch_num_regs (gdbarch);

  if (regnum < num_regs && regnum < gdbarch_num_regs (gdbarch))

    return reg_offset[regnum];

  return -1;

}

/* Return whether the native general-purpose register set supplies

   register REGNUM.  */

int

amd64_native_gregset_supplies_p (struct gdbarch *gdbarch, int regnum)

{

  return (amd64_native_gregset_reg_offset (gdbarch, regnum) != -1);

}

/* Supply register REGNUM, whose contents are stored in GREGS, to

   REGCACHE.  If REGNUM is -1, supply all appropriate registers.  */

void

amd64_supply_native_gregset (struct regcache *regcache,

                             const void *gregs, int regnum)

{

  const char *regs = gregs;

  struct gdbarch *gdbarch = get_regcache_arch (regcache);

  int num_regs = amd64_native_gregset64_num_regs;

  int i;

  if (gdbarch_ptr_bit (gdbarch) == 32)

    num_regs = amd64_native_gregset32_num_regs;

  if (num_regs > gdbarch_num_regs (gdbarch))

    num_regs = gdbarch_num_regs (gdbarch);

  for (i = 0; i < num_regs; i++)

    {

      if (regnum == -1 || regnum == i)

        {

          int offset = amd64_native_gregset_reg_offset (gdbarch, i);

          if (offset != -1)

            regcache_raw_supply (regcache, i, regs + offset);

        }

    }

}

/* Collect register REGNUM from REGCACHE and store its contents in

   GREGS.  If REGNUM is -1, collect and store all appropriate

   registers.  */

void

amd64_collect_native_gregset (const struct regcache *regcache,

                              void *gregs, int regnum)

{

  char *regs = gregs;

  struct gdbarch *gdbarch = get_regcache_arch (regcache);

  int num_regs = amd64_native_gregset64_num_regs;

  int i;

  if (gdbarch_ptr_bit (gdbarch) == 32)

    {

      num_regs = amd64_native_gregset32_num_regs;

      /* Make sure %eax, %ebx, %ecx, %edx, %esi, %edi, %ebp, %esp and

         %eip get zero-extended to 64 bits.  */

      for (i = 0; i <= I386_EIP_REGNUM; i++)

        {

          if (regnum == -1 || regnum == i)

            memset (regs + amd64_native_gregset_reg_offset (gdbarch, i), 0, 8);

        }

      /* Ditto for %cs, %ss, %ds, %es, %fs, and %gs.  */

      for (i = I386_CS_REGNUM; i <= I386_GS_REGNUM; i++)

        {

          if (regnum == -1 || regnum == i)

            memset (regs + amd64_native_gregset_reg_offset (gdbarch, i), 0, 8);

        }

    }

  if (num_regs > gdbarch_num_regs (gdbarch))

    num_regs = gdbarch_num_regs (gdbarch);

  for (i = 0; i < num_regs; i++)

    {

      if (regnum == -1 || regnum == i)

        {

          int offset = amd64_native_gregset_reg_offset (gdbarch, i);

          if (offset != -1)

            regcache_raw_collect (regcache, i, regs + offset);

        }

    }

}