tc-mn10200.c

基于4个mips核的noc设计

/* tc-mn10200.c -- Assembler code for the Matsushita 10200
   Copyright 1996, 1997, 1998, 1999, 2000, 2001
   Free Software Foundation, Inc.

   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 2, 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, 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <stdio.h>
#include <ctype.h>
#include "as.h"
#include "subsegs.h"
#include "opcode/mn10200.h"

/* Structure to hold information about predefined registers.  */
struct reg_name
{
  const char *name;
  int value;
};

/* Generic assembler global variables which must be defined by all
   targets.  */

/* Characters which always start a comment.  */
const char comment_chars[] = "#";

/* Characters which start a comment at the beginning of a line.  */
const char line_comment_chars[] = ";#";

/* Characters which may be used to separate multiple commands on a
   single line.  */
const char line_separator_chars[] = ";";

/* Characters which are used to indicate an exponent in a floating
   point number.  */
const char EXP_CHARS[] = "eE";

/* Characters which mean that a number is a floating point constant,
   as in 0d1.0.  */
const char FLT_CHARS[] = "dD";

const relax_typeS md_relax_table[] = {
  /* bCC relaxing  */
  {0x81, -0x7e, 2, 1},
  {0x8004, -0x7ffb, 5, 2},
  {0x800006, -0x7ffff9, 7, 0},
  /* bCCx relaxing  */
  {0x81, -0x7e, 3, 4},
  {0x8004, -0x7ffb, 6, 5},
  {0x800006, -0x7ffff9, 8, 0},
  /* jsr relaxing  */
  {0x8004, -0x7ffb, 3, 7},
  {0x800006, -0x7ffff9, 5, 0},
  /* jmp relaxing  */
  {0x81, -0x7e, 2, 9},
  {0x8004, -0x7ffb, 3, 10},
  {0x800006, -0x7ffff9, 5, 0},

};

/* Local functions.  */
static void mn10200_insert_operand PARAMS ((unsigned long *, unsigned long *,
					    const struct mn10200_operand *,
					    offsetT, char *, unsigned,
					    unsigned));
static unsigned long check_operand PARAMS ((unsigned long,
					    const struct mn10200_operand *,
					    offsetT));
static int reg_name_search PARAMS ((const struct reg_name *, int, const char *));
static boolean data_register_name PARAMS ((expressionS *expressionP));
static boolean address_register_name PARAMS ((expressionS *expressionP));
static boolean other_register_name PARAMS ((expressionS *expressionP));

/* Fixups.  */
#define MAX_INSN_FIXUPS (5)
struct mn10200_fixup
{
  expressionS exp;
  int opindex;
  bfd_reloc_code_real_type reloc;
};
struct mn10200_fixup fixups[MAX_INSN_FIXUPS];
static int fc;

const char *md_shortopts = "";
struct option md_longopts[] = {
  {NULL, no_argument, NULL, 0}
};
size_t md_longopts_size = sizeof (md_longopts);

/* The target specific pseudo-ops which we support.  */
const pseudo_typeS md_pseudo_table[] =
{
  { NULL,       NULL,           0 }
};

/* Opcode hash table.  */
static struct hash_control *mn10200_hash;

/* This table is sorted. Suitable for searching by a binary search.  */
static const struct reg_name data_registers[] =
{
  { "d0", 0 },
  { "d1", 1 },
  { "d2", 2 },
  { "d3", 3 },
};
#define DATA_REG_NAME_CNT				\
  (sizeof (data_registers) / sizeof (struct reg_name))

static const struct reg_name address_registers[] =
{
  { "a0", 0 },
  { "a1", 1 },
  { "a2", 2 },
  { "a3", 3 },
};
#define ADDRESS_REG_NAME_CNT					\
  (sizeof (address_registers) / sizeof (struct reg_name))

static const struct reg_name other_registers[] =
{
  { "mdr", 0 },
  { "psw", 0 },
};
#define OTHER_REG_NAME_CNT				\
  (sizeof (other_registers) / sizeof (struct reg_name))

/* reg_name_search does a binary search of the given register table
   to see if "name" is a valid regiter name.  Returns the register
   number from the array on success, or -1 on failure.  */

static int
reg_name_search (regs, regcount, name)
     const struct reg_name *regs;
     int regcount;
     const char *name;
{
  int middle, low, high;
  int cmp;

  low = 0;
  high = regcount - 1;

  do
    {
      middle = (low + high) / 2;
      cmp = strcasecmp (name, regs[middle].name);
      if (cmp < 0)
	high = middle - 1;
      else if (cmp > 0)
	low = middle + 1;
      else
	return regs[middle].value;
    }
  while (low <= high);
  return -1;
}

/* Summary of register_name().
 *
 * in: Input_line_pointer points to 1st char of operand.
 *
 * out: A expressionS.
 *	The operand may have been a register: in this case, X_op == O_register,
 *	X_add_number is set to the register number, and truth is returned.
 *	Input_line_pointer->(next non-blank) char after operand, or is in
 *	its original state.
 */

static boolean
data_register_name (expressionP)
     expressionS *expressionP;
{
  int reg_number;
  char *name;
  char *start;
  char c;

  /* Find the spelling of the operand.  */
  start = name = input_line_pointer;

  c = get_symbol_end ();
  reg_number = reg_name_search (data_registers, DATA_REG_NAME_CNT, name);

  /* Look to see if it's in the register table.  */
  if (reg_number >= 0)
    {
      expressionP->X_op = O_register;
      expressionP->X_add_number = reg_number;

      /* Make the rest nice.  */
      expressionP->X_add_symbol = NULL;
      expressionP->X_op_symbol = NULL;

      /* Put back the delimiting char.  */
      *input_line_pointer = c;
      return true;
    }
  else
    {
      /* Reset the line as if we had not done anything.  */
      /* Put back the delimiting char.  */
      *input_line_pointer = c;

      /* Reset input_line pointer.  */
      input_line_pointer = start;
      return false;
    }
}

/* Summary of register_name().
 *
 * in: Input_line_pointer points to 1st char of operand.
 *
 * out: A expressionS.
 *	The operand may have been a register: in this case, X_op == O_register,
 *	X_add_number is set to the register number, and truth is returned.
 *	Input_line_pointer->(next non-blank) char after operand, or is in
 *	its original state.
 */

static boolean
address_register_name (expressionP)
     expressionS *expressionP;
{
  int reg_number;
  char *name;
  char *start;
  char c;

  /* Find the spelling of the operand.  */
  start = name = input_line_pointer;

  c = get_symbol_end ();
  reg_number = reg_name_search (address_registers, ADDRESS_REG_NAME_CNT, name);

  /* Look to see if it's in the register table.  */
  if (reg_number >= 0)
    {
      expressionP->X_op = O_register;
      expressionP->X_add_number = reg_number;

      /* Make the rest nice.  */
      expressionP->X_add_symbol = NULL;
      expressionP->X_op_symbol = NULL;

      /* Put back the delimiting char.  */
      *input_line_pointer = c;
      return true;
    }
  else
    {
      /* Reset the line as if we had not done anything.  */
      /* Put back the delimiting char.  */
      *input_line_pointer = c;

      /* Reset input_line pointer.  */
      input_line_pointer = start;
      return false;
    }
}

/* Summary of register_name().
 *
 * in: Input_line_pointer points to 1st char of operand.
 *
 * out: A expressionS.
 *	The operand may have been a register: in this case, X_op == O_register,
 *	X_add_number is set to the register number, and truth is returned.
 *	Input_line_pointer->(next non-blank) char after operand, or is in
 *	its original state.
 */

static boolean
other_register_name (expressionP)
     expressionS *expressionP;
{
  int reg_number;
  char *name;
  char *start;
  char c;

  /* Find the spelling of the operand.  */
  start = name = input_line_pointer;

  c = get_symbol_end ();
  reg_number = reg_name_search (other_registers, OTHER_REG_NAME_CNT, name);

  /* Look to see if it's in the register table.  */
  if (reg_number >= 0)
    {
      expressionP->X_op = O_register;
      expressionP->X_add_number = reg_number;

      /* Make the rest nice.  */
      expressionP->X_add_symbol = NULL;
      expressionP->X_op_symbol = NULL;

      /* Put back the delimiting char.  */
      *input_line_pointer = c;
      return true;
    }
  else
    {
      /* Reset the line as if we had not done anything.  */
      /* Put back the delimiting char.  */
      *input_line_pointer = c;

      /* Reset input_line pointer.  */
      input_line_pointer = start;
      return false;
    }
}

void
md_show_usage (stream)
     FILE *stream;
{
  fprintf (stream, _("MN10200 options:\n\
none yet\n"));
}

int
md_parse_option (c, arg)
     int c;
     char *arg;
{
  return 0;
}

symbolS *
md_undefined_symbol (name)
     char *name;
{
  return 0;
}

char *
md_atof (type, litp, sizep)
     int type;
     char *litp;
     int *sizep;
{
  int prec;
  LITTLENUM_TYPE words[4];
  char *t;
  int i;

  switch (type)
    {
    case 'f':
      prec = 2;
      break;

    case 'd':
      prec = 4;
      break;

    default:
      *sizep = 0;
      return _("bad call to md_atof");
    }

  t = atof_ieee (input_line_pointer, type, words);
  if (t)
    input_line_pointer = t;

  *sizep = prec * 2;

  for (i = prec - 1; i >= 0; i--)
    {
      md_number_to_chars (litp, (valueT) words[i], 2);
      litp += 2;
    }

  return NULL;
}

void
md_convert_frag (abfd, sec, fragP)
     bfd *abfd;
     asection *sec;
     fragS *fragP;
{
  static unsigned long label_count = 0;
  char buf[40];

  subseg_change (sec, 0);
  if (fragP->fr_subtype == 0)
    {
      fix_new (fragP, fragP->fr_fix + 1, 1, fragP->fr_symbol,
	       fragP->fr_offset, 1, BFD_RELOC_8_PCREL);
      fragP->fr_var = 0;
      fragP->fr_fix += 2;
    }
  else if (fragP->fr_subtype == 1)
    {
      /* Reverse the condition of the first branch.  */
      int offset = fragP->fr_fix;
      int opcode = fragP->fr_literal[offset] & 0xff;

      switch (opcode)
	{
	case 0xe8:
	  opcode = 0xe9;
	  break;
	case 0xe9:
	  opcode = 0xe8;
	  break;
	case 0xe0:
	  opcode = 0xe2;
	  break;
	case 0xe2:
	  opcode = 0xe0;
	  break;
	case 0xe3:
	  opcode = 0xe1;
	  break;
	case 0xe1:
	  opcode = 0xe3;
	  break;
	case 0xe4:
	  opcode = 0xe6;
	  break;
	case 0xe6:
	  opcode = 0xe4;
	  break;
	case 0xe7:
	  opcode = 0xe5;
	  break;
	case 0xe5:
	  opcode = 0xe7;
	  break;
	default:
	  abort ();
	}
      fragP->fr_literal[offset] = opcode;

      /* Create a fixup for the reversed conditional branch.  */
      sprintf (buf, ".%s_%d", FAKE_LABEL_NAME, label_count++);
      fix_new (fragP, fragP->fr_fix + 1, 1,
	       symbol_new (buf, sec, 0, fragP->fr_next),
	       fragP->fr_offset, 1, BFD_RELOC_8_PCREL);

      /* Now create the unconditional branch + fixup to the
	 final target.  */
      fragP->fr_literal[offset + 2] = 0xfc;
      fix_new (fragP, fragP->fr_fix + 3, 2, fragP->fr_symbol,
	       fragP->fr_offset, 1, BFD_RELOC_16_PCREL);
      fragP->fr_var = 0;
      fragP->fr_fix += 5;
    }
  else if (fragP->fr_subtype == 2)
    {
      /* Reverse the condition of the first branch.  */
      int offset = fragP->fr_fix;
      int opcode = fragP->fr_literal[offset] & 0xff;

      switch (opcode)
	{