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/* tc-xc16x.c -- Assembler for the Infineon XC16X.

   Copyright 2006, 2007, 2009  Free Software Foundation, Inc.

   Contributed by KPIT Cummins Infosystems

   This file is part of GAS, the GNU Assembler.

   GAS 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, or (at your option)

   any later version.

   GAS 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 GAS; see the file COPYING.  If not, write to the Free

   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA

   02110-1301, USA.  */

#include "as.h"

#include "safe-ctype.h"

#include "subsegs.h"

#include "symcat.h"

#include "opcodes/xc16x-desc.h"

#include "opcodes/xc16x-opc.h"

#include "cgen.h"

#include "dwarf2dbg.h"

#ifdef OBJ_ELF

#include "elf/xc16x.h"

#endif

/* Structure to hold all of the different components describing

   an individual instruction.  */

typedef struct

{

  const CGEN_INSN *     insn;

  const CGEN_INSN *     orig_insn;

  CGEN_FIELDS           fields;

#if CGEN_INT_INSN_P

  CGEN_INSN_INT         buffer [1];

#define INSN_VALUE(buf) (*(buf))

#else

  unsigned char buffer [CGEN_MAX_INSN_SIZE];

#define INSN_VALUE(buf) (buf)

#endif

  char *                addr;

  fragS *               frag;

  int                   num_fixups;

  fixS *                fixups [GAS_CGEN_MAX_FIXUPS];

  int                   indices [MAX_OPERAND_INSTANCES];

}

xc16x_insn;

const char comment_chars[]        = ";";

const char line_comment_chars[]   = "#";

const char line_separator_chars[] = "";

const char EXP_CHARS[]            = "eE";

const char FLT_CHARS[]            = "dD";

#define XC16X_SHORTOPTS ""

const char * md_shortopts = XC16X_SHORTOPTS;

struct option md_longopts[] =

{

  {NULL, no_argument, NULL, 0}

};

size_t md_longopts_size = sizeof (md_longopts);

static void

xc16xlmode (int arg ATTRIBUTE_UNUSED)

{

 if (stdoutput != NULL)

  if (!bfd_set_arch_mach (stdoutput, bfd_arch_xc16x, bfd_mach_xc16xl))

    as_warn (_("could not set architecture and machine"));

}

static void

xc16xsmode (int arg ATTRIBUTE_UNUSED)

{

  if (!bfd_set_arch_mach (stdoutput, bfd_arch_xc16x, bfd_mach_xc16xs))

    as_warn (_("could not set architecture and machine"));

}

static void

xc16xmode (int arg ATTRIBUTE_UNUSED)

{

  if (!bfd_set_arch_mach (stdoutput, bfd_arch_xc16x, bfd_mach_xc16x))

    as_warn (_("could not set architecture and machine"));

}

/* The target specific pseudo-ops which we support.  */

const pseudo_typeS md_pseudo_table[] =

{

  { "word",     cons,           2 },

  {"xc16xl",  xc16xlmode,  0},

  {"xc16xs", xc16xsmode, 0},

  {"xc16x",  xc16xmode,  0},

  { NULL,       NULL,           0 }

};

void

md_begin (void)

{

  /* Initialize the `cgen' interface.  */

  /* Set the machine number and endian.  */

  gas_cgen_cpu_desc = xc16x_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0,

                                           CGEN_CPU_OPEN_ENDIAN,

                                           CGEN_ENDIAN_LITTLE,

                                           CGEN_CPU_OPEN_END);

  xc16x_cgen_init_asm (gas_cgen_cpu_desc);

  /* This is a callback from cgen to gas to parse operands.  */

  cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);

}

void

md_assemble (char *str)

{

  xc16x_insn insn;

  char *errmsg;

  /* Initialize GAS's cgen interface for a new instruction.  */

  gas_cgen_init_parse ();

  insn.insn = xc16x_cgen_assemble_insn

    (gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);

  if (!insn.insn)

    {

      as_bad ("%s", errmsg);

      return;

    }

  /* Doesn't really matter what we pass for RELAX_P here.  */

  gas_cgen_finish_insn (insn.insn, insn.buffer,

                        CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);

}

/* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.

   Returns BFD_RELOC_NONE if no reloc type can be found.

   *FIXP may be modified if desired.  */

bfd_reloc_code_real_type

md_cgen_lookup_reloc (const CGEN_INSN *insn ATTRIBUTE_UNUSED,

                      const CGEN_OPERAND *operand,

                      fixS *fixP)

{

  switch (operand->type)

    {

    case XC16X_OPERAND_REL:

      fixP->fx_where += 1;

      fixP->fx_pcrel = 1;

      return BFD_RELOC_8_PCREL;

    case XC16X_OPERAND_CADDR:

      fixP->fx_where += 2;

      return BFD_RELOC_16;

    case XC16X_OPERAND_UIMM7:

      fixP->fx_where += 1;

      fixP->fx_pcrel = 1;

      return BFD_RELOC_8_PCREL;

    case XC16X_OPERAND_UIMM16:

    case XC16X_OPERAND_MEMORY:

      fixP->fx_where += 2;

      return BFD_RELOC_16;

    case XC16X_OPERAND_UPOF16:

      fixP->fx_where += 2;

      return BFD_RELOC_XC16X_POF;

    case XC16X_OPERAND_UPAG16:

      fixP->fx_where += 2;

      return BFD_RELOC_XC16X_PAG;

    case XC16X_OPERAND_USEG8:

      fixP->fx_where += 1;

      return BFD_RELOC_XC16X_SEG;

    case XC16X_OPERAND_USEG16:

    case  XC16X_OPERAND_USOF16:

      fixP->fx_where += 2;

      return BFD_RELOC_XC16X_SOF;

    default : /* Avoid -Wall warning.  */

      break;

    }

  fixP->fx_where += 2;

  return BFD_RELOC_XC16X_SOF;

}

/* Write a value out to the object file, using the appropriate endianness.  */

void

md_number_to_chars (char * buf, valueT val, int n)

{

  number_to_chars_littleendian (buf, val, n);

}

void

md_show_usage (FILE * stream)

{

  fprintf (stream, _(" XC16X specific command line options:\n"));

}

int

md_parse_option (int c ATTRIBUTE_UNUSED,

                 char *arg ATTRIBUTE_UNUSED)

{

  return 0;

}

char *

md_atof (int type, char *litP, int *sizeP)

{

  return ieee_md_atof (type, litP, sizeP, FALSE);

}

valueT

md_section_align (segT segment, valueT size)

{

  int align = bfd_get_section_alignment (stdoutput, segment);

  return ((size + (1 << align) - 1) & (-1 << align));

}

symbolS *

md_undefined_symbol (char *name ATTRIBUTE_UNUSED)

{

  return NULL;

}

int

md_estimate_size_before_relax (fragS *fragP ATTRIBUTE_UNUSED,

                               segT segment_type ATTRIBUTE_UNUSED)

{

  printf (_("call to md_estimate_size_before_relax \n"));

  abort ();

}

long

md_pcrel_from (fixS *fixP)

{

  long temp_val;

  temp_val=fixP->fx_size + fixP->fx_where + fixP->fx_frag->fr_address;

  return temp_val;

}

long

md_pcrel_from_section (fixS *fixP, segT sec)

{

  if (fixP->fx_addsy != (symbolS *) NULL

      && (! S_IS_DEFINED (fixP->fx_addsy)

          || S_GET_SEGMENT (fixP->fx_addsy) != sec

          || S_IS_EXTERNAL (fixP->fx_addsy)

          || S_IS_WEAK (fixP->fx_addsy)))

    {

      return 0;

    }

  return md_pcrel_from (fixP);

}

arelent *

tc_gen_reloc (asection *section ATTRIBUTE_UNUSED, fixS *fixp)

{

  arelent *rel;

  bfd_reloc_code_real_type r_type;

  if (fixp->fx_addsy && fixp->fx_subsy)

    {

      if ((S_GET_SEGMENT (fixp->fx_addsy) != S_GET_SEGMENT (fixp->fx_subsy))

          || S_GET_SEGMENT (fixp->fx_addsy) == undefined_section)

        {

          as_bad_where (fixp->fx_file, fixp->fx_line,

                        _("Difference of symbols in different sections is not supported"));

          return NULL;

        }

    }

  rel = xmalloc (sizeof (arelent));

  rel->sym_ptr_ptr = xmalloc (sizeof (asymbol *));

  *rel->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);

  rel->address = fixp->fx_frag->fr_address + fixp->fx_where;

  rel->addend = fixp->fx_offset;

  r_type = fixp->fx_r_type;

#define DEBUG 0

#if DEBUG

  fprintf (stderr, "%s\n", bfd_get_reloc_code_name (r_type));

  fflush (stderr);

#endif

  rel->howto = bfd_reloc_type_lookup (stdoutput, r_type);

   if (rel->howto == NULL)

    {

      as_bad_where (fixp->fx_file, fixp->fx_line,

                    _("Cannot represent relocation type %s"),

                    bfd_get_reloc_code_name (r_type));

      return NULL;

    }

  return rel;

}

void

md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED)

{

  if (!strstr (seg->name,".debug"))

    {

      if (*valP < 128)

        *valP /= 2;

      if (*valP>268435455)

        {

          *valP = *valP * (-1);

          *valP /= 2;

          *valP = 256 - (*valP);

        }

    }

  gas_cgen_md_apply_fix (fixP, valP, seg);

  return;

}

void

md_convert_frag (bfd *headers ATTRIBUTE_UNUSED,

                 segT seg ATTRIBUTE_UNUSED,

                 fragS *fragP ATTRIBUTE_UNUSED)

{

  printf (_("call to md_convert_frag \n"));

  abort ();

}