xref: /src/external/gpl3/gdb.old/dist/bfd/cpu-aarch64.c

/* BFD support for AArch64.
   Copyright 2009, 2010, 2011, 2012  Free Software Foundation, Inc.
   Contributed by ARM Ltd.

   This file is part of BFD, the Binary File Descriptor library.

   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; see the file COPYING3. If not,
   see <http://www.gnu.org/licenses/>.  */

#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "libiberty.h"

/* This routine is provided two arch_infos and works out which Aarch64
   machine which would be compatible with both and returns a pointer
   to its info structure.  */

static const bfd_arch_info_type *
compatible (const bfd_arch_info_type * a, const bfd_arch_info_type * b)
{
  /* If a & b are for different architecture we can do nothing.  */
  if (a->arch != b->arch)
    return NULL;

  /* If a & b are for the same machine then all is well.  */
  if (a->mach == b->mach)
    return a;

  /* Don't allow mixing ilp32 with lp64.  */
  if ((a->mach & bfd_mach_aarch64_ilp32) != (b->mach & bfd_mach_aarch64_ilp32))
    return NULL;

  /* Otherwise if either a or b is the 'default' machine
     then it can be polymorphed into the other.  */
  if (a->the_default)
    return b;

  if (b->the_default)
    return a;

  /* So far all newer cores are
     supersets of previous cores.  */
  if (a->mach < b->mach)
    return b;
  else if (a->mach > b->mach)
    return a;

  /* Never reached!  */
  return NULL;
}

static struct
{
  unsigned int mach;
  char *name;
}
processors[] =
{
  /* These two are example CPUs supported in GCC, once we have real
     CPUs they will be removed.  */
  { bfd_mach_aarch64, "example-1" },
  { bfd_mach_aarch64, "example-2" }
};

static bfd_boolean
scan (const struct bfd_arch_info *info, const char *string)
{
  int i;

  /* First test for an exact match.  */
  if (strcasecmp (string, info->printable_name) == 0)
    return TRUE;

  /* Next check for a processor name instead of an Architecture name.  */
  for (i = sizeof (processors) / sizeof (processors[0]); i--;)
    {
      if (strcasecmp (string, processors[i].name) == 0)
	break;
    }

  if (i != -1 && info->mach == processors[i].mach)
    return TRUE;

  /* Finally check for the default architecture.  */
  if (strcasecmp (string, "aarch64") == 0)
    return info->the_default;

  return FALSE;
}

#define N(NUMBER, PRINT, DEFAULT, NEXT)				\
  { 64, 64, 8, bfd_arch_aarch64, NUMBER,			\
    "aarch64", PRINT, 4, DEFAULT, compatible, scan,		\
    bfd_arch_default_fill, NEXT }

static const bfd_arch_info_type bfd_aarch64_arch_ilp32 =
  N (bfd_mach_aarch64_ilp32, "aarch64:ilp32", FALSE, NULL);

const bfd_arch_info_type bfd_aarch64_arch =
  N (0, "aarch64", TRUE, &bfd_aarch64_arch_ilp32);

bfd_boolean
bfd_is_aarch64_special_symbol_name (const char *name, int type)
{
  if (!name || name[0] != '$')
    return FALSE;
  if (name[1] == 'x' || name[1] == 'd')
    type &= BFD_AARCH64_SPECIAL_SYM_TYPE_MAP;
  else if (name[1] == 'm' || name[1] == 'f' || name[1] == 'p')
    type &= BFD_AARCH64_SPECIAL_SYM_TYPE_TAG;
  else
    return FALSE;

  return (type != 0 && (name[2] == 0 || name[2] == '.'));
}