/* Register names and numbers for S/390 DWARF.

   Copyright (C) 2006 Red Hat, Inc.

   This file is part of elfutils.

   This file is free software; you can redistribute it and/or modify

   it under the terms of either

     * the GNU Lesser General Public License as published by the Free

       Software Foundation; either version 3 of the License, or (at

       your option) any later version

   or

     * the GNU General Public License as published by the Free

       Software Foundation; either version 2 of the License, or (at

       your option) any later version

   or both in parallel, as here.

   elfutils 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 copies of the GNU General Public License and

   the GNU Lesser General Public License along with this program.  If

   not, see <http://www.gnu.org/licenses/>.  */

#ifdef HAVE_CONFIG_H

# include <config.h>

#endif

#include <string.h>

#include <dwarf.h>

#define BACKEND s390_

#include "libebl_CPU.h"

/*

zseries (64)

0-15	gpr0-gpr15	x

16-19	fpr[0246]

20-24	fpr[13578]

25-27	fpr1[024]

28	fpr9

29-31	fpr1[135]

32-47	cr0-cr15	x

48-63	ar0-ar15	x

64	psw_mask

65	psw_address

*/

ssize_t

s390_register_info (Ebl *ebl __attribute__ ((unused)),

		    int regno, char *name, size_t namelen,

		    const char **prefix, const char **setname,

		    int *bits, int *type)

{

  if (name == NULL)

    return 66;

  if (regno < 0 || regno > 65 || namelen < 7)

    return -1;

  *prefix = "%";

  *bits = ebl->class == ELFCLASS64 ? 64 : 32;

  *type = DW_ATE_unsigned;

  if (regno < 16)

    {

      *setname = "integer";

      *type = DW_ATE_signed;

    }

  else if (regno < 32)

    {

      *setname = "FPU";

      *type = DW_ATE_float;

      *bits = 64;

    }

  else if (regno < 48 || regno > 63)

    *setname = "control";

  else

    {

      *setname = "access";

      *bits = 32;

    }

  switch (regno)

    {

    case 0 ... 9:

      name[0] = 'r';

      name[1] = regno + '0';

      namelen = 2;

      break;

    case 10 ... 15:

      name[0] = 'r';

      name[1] = '1';

      name[2] = regno - 10 + '0';

      namelen = 3;

      break;

    case 16 ... 31:

      name[0] = 'f';

      regno = (regno & 8) | ((regno & 4) >> 2) | ((regno & 3) << 1);

      namelen = 1;

      if (regno >= 10)

	{

	  regno -= 10;

	  name[namelen++] = '1';

	}

      name[namelen++] = regno + '0';

      break;

    case 32 + 0 ... 32 + 9:

    case 48 + 0 ... 48 + 9:

      name[0] = regno < 48 ? 'c' : 'a';

      name[1] = (regno & 15) + '0';

      namelen = 2;

      break;

    case 32 + 10 ... 32 + 15:

    case 48 + 10 ... 48 + 15:

      name[0] = regno < 48 ? 'c' : 'a';

      name[1] = '1';

      name[2] = (regno & 15) - 10 + '0';

      namelen = 3;

      break;

    case 64:

      return stpcpy (name, "pswm") + 1 - name;

    case 65:

      *type = DW_ATE_address;

      return stpcpy (name, "pswa") + 1 - name;

    default:

      *setname = NULL;

      return 0;

    }

  name[namelen++] = '\0';

  return namelen;

}