[deliverable/binutils-gdb.git] / gas / config / tc-v850.c

/* tc-v850.c -- Assembler code for the NEC V850
   Copyright (C) 1996, 1997 Free Software Foundation.

   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/v850.h"

/* Temporarily holds the reloc in a cons expression.  */
static bfd_reloc_code_real_type hold_cons_reloc;
\f
/* 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";
\f

const relax_typeS md_relax_table[] = {
  {0xff, -0x100, 2, 1},
  {0x1fffff, -0x200000, 6, 0},
};

/* start-sanitize-v850e */
static boolean support_v850e = false;
/* end-sanitize-v850e */
/* start-sanitize-v850eq */
static boolean support_v850eq = false;
/* end-sanitize-v850eq */

/* local functions */
static unsigned long v850_insert_operand
  PARAMS ((unsigned long insn, const struct v850_operand *operand,
           offsetT val, char *file, unsigned int line));


/* fixups */
#define MAX_INSN_FIXUPS (5)
struct v850_fixup
{
  expressionS exp;
  int opindex;
  bfd_reloc_code_real_type reloc;
};
struct v850_fixup fixups[MAX_INSN_FIXUPS];
static int fc;
\f
/* The target specific pseudo-ops which we support.  */
const pseudo_typeS md_pseudo_table[] =
{
  {"word", cons, 4},
  { NULL,       NULL,           0 }
};

/* Opcode hash table.  */
static struct hash_control *v850_hash;

/* This table is sorted. Suitable for searching by a binary search. */
static const struct reg_name pre_defined_registers[] =
{
  { "ep", 30 },                 /* ep - element ptr */
  { "gp", 4 },                  /* gp - global ptr */
  { "lp", 31 },                 /* lp - link ptr */
  { "r0", 0 },
  { "r1", 1 },
  { "r10", 10 },
  { "r11", 11 },
  { "r12", 12 },
  { "r13", 13 },
  { "r14", 14 },
  { "r15", 15 },
  { "r16", 16 },
  { "r17", 17 },
  { "r18", 18 },
  { "r19", 19 },
  { "r2", 2 },
  { "r20", 20 },
  { "r21", 21 },
  { "r22", 22 },
  { "r23", 23 },
  { "r24", 24 },
  { "r25", 25 },
  { "r26", 26 },
  { "r27", 27 },
  { "r28", 28 },
  { "r29", 29 },
  { "r3", 3 },
  { "r30", 30 },
  { "r31", 31 },
  { "r4", 4 },
  { "r5", 5 },
  { "r6", 6 },
  { "r7", 7 },
  { "r8", 8 },
  { "r9", 9 },
  { "sp", 3 },                  /* sp - stack ptr */
  { "tp", 5 },                  /* tp - text ptr */
  { "zero", 0 },
};
#define REG_NAME_CNT    (sizeof(pre_defined_registers) / sizeof(struct reg_name))


static const struct reg_name system_registers[] = 
{
  { "ecr", 4 },
  { "eipc", 0 },
  { "eipsw", 1 },
  { "fepc", 2 },
  { "fepsw", 3 },
  { "psw", 5 },
};
#define SYSREG_NAME_CNT (sizeof(system_registers) / sizeof(struct reg_name))

static const struct reg_name cc_names[] =
{
  { "c", 0x1 },
  { "ge", 0xe },
  { "gt", 0xf },
  { "h", 0xb },
  { "l", 0x1 },
  { "le", 0x7 },
  { "lt", 0x6 },
  { "n", 0x4 },
  { "nc", 0x9 },
  { "nh", 0x3 },
  { "nl", 0x9 },
  { "ns", 0xc },
  { "nv", 0x8 },
  { "nz", 0xa },
  { "p",  0xc },
  { "s", 0x4 },
  { "sa", 0xd },
  { "t", 0x5 },
  { "v", 0x0 },
  { "z", 0x2 },
};
#define CC_NAME_CNT     (sizeof(cc_names) / 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
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 (pre_defined_registers, 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;
      *input_line_pointer = c;  /* put back the delimiting char */
      return true;
    }
  else
    {
      /* reset the line as if we had not done anything */
      *input_line_pointer = c;   /* put back the delimiting char */
      input_line_pointer = start; /* reset input_line pointer */
      return false;
    }
}

/* Summary of system_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
system_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 (system_registers, SYSREG_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;
      *input_line_pointer = c;  /* put back the delimiting char */
      return true;
    }
  else
    {
      /* reset the line as if we had not done anything */
      *input_line_pointer = c;   /* put back the delimiting char */
      input_line_pointer = start; /* reset input_line pointer */
      return false;
    }
}

/* Summary of cc_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
cc_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 (cc_names, CC_NAME_CNT, name);

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

      /* make the rest nice */
      expressionP->X_add_symbol = NULL;
      expressionP->X_op_symbol = NULL;
      *input_line_pointer = c;  /* put back the delimiting char */
      return true;
    }
  else
    {
      /* reset the line as if we had not done anything */
      *input_line_pointer = c;   /* put back the delimiting char */
      input_line_pointer = start; /* reset input_line pointer */
      return false;
    }
}

/* start-sanitize-v850e */
/* Summary of parse_register_list ().
 *
 * in: Input_line_pointer  points to 1st char of a list of registers.
 *     insn                is the partially constructed instruction.
 *     operand             is the operand being inserted.
 *
 * out: True if the parse completed successfully, False otherwise.
 *      If the parse completes the correct bit fields in the
 *      instruction will be filled in.
 */
static boolean
parse_register_list
(
  unsigned long *             insn,
  const struct v850_operand * operand
)
{
  static int  type1_regs[ 32 ] = { 30,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, 31, 29, 28, 23, 22, 21, 20, 27, 26, 25, 24 };
/* start-sanitize-v850eq */
  static int  type2_regs[ 32 ] = { 19, 18, 17, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 30, 31, 29, 28, 23, 22, 21, 20, 27, 26, 25, 24 };
  static int  type3_regs[ 32 ] = {  3,  2,  1,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 14, 15, 13, 12,  7,  6,  5,  4, 11, 10,  9,  8 };
/* end-sanitize-v850eq */
  int *       regs;

  /* Select a register array to parse. */
  switch (operand->shift)
    {
    case 0xffe00001: regs = type1_regs; break;
/* start-sanitize-v850eq */
    case 0xfff8000f: regs = type2_regs; break;
    case 0xfff8001f: regs = type3_regs; break;
/* end-sanitize-v850eq */
    default:
      fprintf (stderr, "unknown operand shift: %x\n", operand->shift );             
      return false;
    }

  /* Parse the register list until a terminator (comma or new-line) is found.  */
  for (;;)
    {
      expressionS exp;
      int         i;

      if (register_name (& exp))
        {
          /* Locate the given register in the list, and if it is there, insert the corresponding bit into the instruction.  */
          for (i = 0; i < 32; i++)
            {
              if (regs[ i ] == exp.X_add_number)
                {
                  * insn |= (1 << i);
                  break;
                }
            }

          if (i == 32)
            {
              as_bad( "unable to insert register r%d into list\n", exp.X_add_number );
              return false;
            }
        }
      else if (system_register_name (& exp))
        {
          if (regs == type1_regs)
            {
              as_bad ("system registers cannot be included in this register list" );
              return false;
            }
          else if (exp.X_add_number == 5)
            {
              if (regs == type2_regs)
                as_bad ("PSW cannot be included in this register list" );
              else
                * insn |= 0x8;
            }
          else
            * insn |= 0x80000;
        }
      else
        break;

      /* Skip white space.  */
      while (* input_line_pointer == ' ' || * input_line_pointer == '\t')
        ++ input_line_pointer;
    }

  return true;
}
/* end-sanitize-v850e */

CONST char * md_shortopts = "m:";

struct option md_longopts[] =
{
  {NULL, no_argument, NULL, 0}
};
size_t md_longopts_size = sizeof md_longopts; 


void
md_show_usage (stream)
  FILE *stream;
{
  fprintf (stream, "V850 options:\n");
/* start-sanitize-v850e */
  fprintf (stream, "  -mcpu=v850e    target the V850E processor\n");
/* end-sanitize-v850e */
/* start-sanitize-v850eq */
  fprintf (stream, "  -mcpu=v850eq   target the V850E processor with Quantum's extensions\n");
/* end-sanitize-v850eq */
} 

int
md_parse_option (c, arg)
     int    c;
     char * arg;
{
/* start-sanitize-v850e */
  if ((c == 'm') && arg != NULL && (strcmp (arg, "cpu=v850e") == 0))
    {
      support_v850e = true;
      return 1;
    }
/* end-sanitize-v850e */

/* start-sanitize-v850eq */
  if ((c == 'm') && arg != NULL && (strcmp (arg, "cpu=v850eq") == 0))
    {
      support_v850e = true;
      support_v850eq = true;
      return 1;
    }
/* end-sanitize-v850eq */

  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;
}


/* Very gross.  */
void
md_convert_frag (abfd, sec, fragP)
  bfd *abfd;
  asection *sec;
  fragS *fragP;
{
  subseg_change (sec, 0);
  if (fragP->fr_subtype == 0)
    {
      fix_new (fragP, fragP->fr_fix, 2, fragP->fr_symbol,
               fragP->fr_offset, 1, BFD_RELOC_UNUSED + (int)fragP->fr_opcode);
      fragP->fr_var = 0;
      fragP->fr_fix += 2;
    }
  else if (fragP->fr_subtype == 1)
    {
      /* Reverse the condition of the first branch.  */
      fragP->fr_literal[0] &= 0xf7;
      /* Mask off all the displacement bits.  */
      fragP->fr_literal[0] &= 0x8f;
      fragP->fr_literal[1] &= 0x07;
      /* Now set the displacement bits so that we branch
         around the unconditional branch.  */
      fragP->fr_literal[0] |= 0x30;

      /* Now create the unconditional branch + fixup to the final
         target.  */
      md_number_to_chars (&fragP->fr_literal[2], 0x00000780, 4);
      fix_new (fragP, fragP->fr_fix + 2, 4, fragP->fr_symbol,
               fragP->fr_offset, 1, BFD_RELOC_UNUSED + (int)fragP->fr_opcode + 1);
      fragP->fr_var = 0;
      fragP->fr_fix += 6;
    }
  else
    abort ();
}

valueT
md_section_align (seg, addr)
     asection *seg;
     valueT addr;
{
  int align = bfd_get_section_alignment (stdoutput, seg);
  return ((addr + (1 << align) - 1) & (-1 << align));
}

void
md_begin ()
{
  char *prev_name = "";
  register const struct v850_opcode *op;

  v850_hash = hash_new();

  /* Insert unique names into hash table.  The V850 instruction set
     has many identical opcode names that have different opcodes based
     on the operands.  This hash table then provides a quick index to
     the first opcode with a particular name in the opcode table.  */

  op     = v850_opcodes;
  while (op->name)
    {
      if (strcmp (prev_name, op->name)) 
        {
          prev_name = (char *) op->name;
          hash_insert (v850_hash, op->name, (char *) op);
        }
      op++;
    }
}

static bfd_reloc_code_real_type
v850_reloc_prefix ()
{
  if (strncmp(input_line_pointer, "hi0(", 4) == 0)
    {
      input_line_pointer += 3;
      return BFD_RELOC_HI16;
    }
  if (strncmp(input_line_pointer, "hi(", 3) == 0)
    {
      input_line_pointer += 2;
      return BFD_RELOC_HI16_S;
    }
  if (strncmp (input_line_pointer, "lo(", 3) == 0)
    {
      input_line_pointer += 2;
      return BFD_RELOC_LO16;
    }

  if (strncmp (input_line_pointer, "sdaoff(", 7) == 0)
    {
      input_line_pointer += 6;
      return BFD_RELOC_V850_SDA_OFFSET;
    }

  if (strncmp (input_line_pointer, "zdaoff(", 7) == 0)
    {
      input_line_pointer += 6;
      return BFD_RELOC_V850_ZDA_OFFSET;
    }

  if (strncmp (input_line_pointer, "tdaoff(", 7) == 0)
    {
      input_line_pointer += 6;
      return BFD_RELOC_V850_TDA_OFFSET;
    }

  /* Disgusting */
  if (strncmp(input_line_pointer, "(hi0(", 5) == 0)
    {
      input_line_pointer += 4;
      return BFD_RELOC_HI16;
    }
  if (strncmp(input_line_pointer, "(hi(", 4) == 0)
    {
      input_line_pointer += 3;
      return BFD_RELOC_HI16_S;
    }
  if (strncmp (input_line_pointer, "(lo(", 4) == 0)
    {
      input_line_pointer += 3;
      return BFD_RELOC_LO16;
    }

  if (strncmp (input_line_pointer, "(sdaoff(", 8) == 0)
    {
      input_line_pointer += 7;
      return BFD_RELOC_V850_SDA_OFFSET;
    }

  if (strncmp (input_line_pointer, "(zdaoff(", 8) == 0)
    {
      input_line_pointer += 7;
      return BFD_RELOC_V850_ZDA_OFFSET;
    }

  if (strncmp (input_line_pointer, "(tdaoff(", 8) == 0)
    {
      input_line_pointer += 7;
      return BFD_RELOC_V850_TDA_OFFSET;
    }

  return BFD_RELOC_UNUSED;
}

void
md_assemble (str) 
     char * str;
{
  char *                    s;
  char *                    start_of_operands;
  struct v850_opcode *      opcode;
  struct v850_opcode *      next_opcode;
  const unsigned char *     opindex_ptr;
  int                       next_opindex;
  int                       relaxable;
  unsigned long             insn;
  unsigned long             insn_size;
  char *                    f;
  int                       i;
  int                       match;
  bfd_reloc_code_real_type  reloc;
  boolean                   extra_data_after_insn = false;
  unsigned                  extra_data_len;
  unsigned long             extra_data;
  

  /* Get the opcode.  */
  for (s = str; *s != '\0' && ! isspace (*s); s++)
    continue;
  
  if (*s != '\0')
    *s++ = '\0';

  /* find the first opcode with the proper name */
  opcode = (struct v850_opcode *)hash_find (v850_hash, str);
  if (opcode == NULL)
    {
      as_bad ("Unrecognized opcode: `%s'", str);
      ignore_rest_of_line ();
      return;
    }

  str = s;
  while (isspace (*str))
    ++str;

  start_of_operands = str;

  for (;;)
    {
      const char * errmsg = NULL;

      relaxable = 0;
      fc = 0;
      match = 0;
      next_opindex = 0;
      insn = opcode->opcode;
      extra_data_after_insn = false;

      input_line_pointer = str = start_of_operands;

/* start-sanitize-v850e */
      if ((opcode->flags & V850E_INSTRUCTION) && ! support_v850e)
        {
          errmsg = "V850E instructions not allowed";
          goto error;
        }
/* end-sanitize-v850e */
      
/* start-sanitize-v850eq */
      if ((opcode->flags & V850EQ_INSTRUCTION) && ! support_v850eq)
        {
          errmsg = "V850EQ instructions not allowed";
          goto error;
        }
/* end-sanitize-v850eq */
      
      for (opindex_ptr = opcode->operands; *opindex_ptr != 0; opindex_ptr++)
        {
          const struct v850_operand * operand;
          char *                      hold;
          expressionS                 ex;

          if (next_opindex == 0)
            {
              operand = &v850_operands[*opindex_ptr];
            }
          else
            {
              operand = &v850_operands[next_opindex];
              next_opindex = 0;
            }

          errmsg = NULL;

          while (*str == ' ' || *str == ',' || *str == '[' || *str == ']')
            ++str;

          if (operand->flags & V850_OPERAND_RELAX)
            relaxable = 1;

          /* Gather the operand. */
          hold = input_line_pointer;
          input_line_pointer = str;
          
// fprintf (stderr, "operand: %s   index = %d, opcode = %s\n", input_line_pointer, opindex_ptr - opcode->operands, opcode->name );

          /* lo(), hi(), hi0(), etc... */
          if ((reloc = v850_reloc_prefix()) != BFD_RELOC_UNUSED)
            {
              expression (& ex);

              if (ex.X_op == O_constant)
                {
                  switch (reloc)
                    {
                    case BFD_RELOC_LO16:
                      {
                        /* Truncate, then sign extend the value.  */
                        int temp = ex.X_add_number & 0xffff;

                        /* XXX Assumes 32bit ints! */
                        temp = (temp << 16) >> 16;
                        ex.X_add_number = temp;
                        break;
                      }

                    case BFD_RELOC_HI16:
                      {
                        /* Truncate, then sign extend the value.  */
                        int temp = (ex.X_add_number >> 16) & 0xffff;

                        /* XXX Assumes 32bit ints! */
                        temp = (temp << 16) >> 16;
                        ex.X_add_number = temp;
                        break;
                      }

                    case BFD_RELOC_HI16_S:
                      {
                        /* Truncate, then sign extend the value.  */
                        int temp = (ex.X_add_number >> 16) & 0xffff;

                        temp += (ex.X_add_number >> 15) & 1;

                        /* XXX Assumes 32bit ints! */
                        temp = (temp << 16) >> 16;
                        ex.X_add_number = temp;
                        break;
                      }

                    default:
                      break;
                    }

                  insn = v850_insert_operand (insn, operand, ex.X_add_number,
                                              (char *) NULL, 0);
                }
              else
                {
                  if (fc > MAX_INSN_FIXUPS)
                    as_fatal ("too many fixups");

                  /* Adjust any offsets for sst.{h,w}/sld.{h,w} instructions */
                  if (operand->flags & V850_OPERAND_ADJUST_SHORT_MEMORY)
                    ex.X_add_number >>= 1;

                  fixups[fc].exp = ex;
                  fixups[fc].opindex = *opindex_ptr;
                  fixups[fc].reloc = reloc;
                  fc++;
                }
            }
          else
            {
              errmsg = NULL;
              
              if ((operand->flags & V850_OPERAND_REG) != 0) 
                {
                  if (!register_name (& ex))
                    {
                      errmsg = "invalid register name";
                    }
                }
              else if ((operand->flags & V850_OPERAND_SRG) != 0) 
                {
                  if (!system_register_name (& ex))
                    {
                      errmsg = "invalid system register name";
                    }
                }
              else if ((operand->flags & V850_OPERAND_EP) != 0)
                {
                  char * start = input_line_pointer;
                  char   c     = get_symbol_end ();
                  
                  if (strcmp (start, "ep") != 0 && strcmp (start, "r30") != 0)
                    {
                      /* Put things back the way we found them.  */
                      *input_line_pointer = c;
                      input_line_pointer = start;
                      errmsg = "expected EP register";
                      goto error;
                    }
                  
                  *input_line_pointer = c;
                  str = input_line_pointer;
                  input_line_pointer = hold;
              
                  while (*str == ' ' || *str == ',' || *str == '[' || *str == ']')
                    ++str;
                  continue;
                }
              else if ((operand->flags & V850_OPERAND_CC) != 0) 
                {
                  if (!cc_name (& ex))
                    {
                      errmsg = "invalid condition code name";
                    }
                }
              else if (operand->flags & V850E_PUSH_POP) 
                {
                  if (! parse_register_list (& insn, operand))
                    {
                      errmsg = "invalid register list";
                    }
                  
                  /* The parse_register_list() function has already done everything, so fake a dummy expression.  */
                  ex.X_op         = O_constant;
                  ex.X_add_number = 0;
                }
              else if (operand->flags & V850E_IMMEDIATE16) 
                {
                  expression (& ex);

                  if (ex.X_op != O_constant)
                    errmsg = "constant expression expected";
                  else if (ex.X_add_number & 0xffff0000)
                    {
                      if (ex.X_add_number & 0xffff)
                        errmsg = "constant too big to fit into instruction";
                      else if ((insn & 0x001fffc0) == 0x00130780)
                        ex.X_add_number >>= 16;
                      else
                        errmsg = "constant too big to fit into instruction";
                    }
                  
                  extra_data_after_insn = true;
                  extra_data_len        = 2;
                  extra_data            = ex.X_add_number;
                  ex.X_add_number       = 0;
                }
              else if (operand->flags & V850E_IMMEDIATE32) 
                {
                  expression (& ex);
                  
                  if (ex.X_op != O_constant)
                    errmsg = "constant expression expected";
                  
                  extra_data_after_insn = true;
                  extra_data_len        = 4;
                  extra_data            = ex.X_add_number;
                  ex.X_add_number       = 0;
                }
              else if (register_name (&ex)
                       && (operand->flags & V850_OPERAND_REG) == 0)
                {
                  errmsg = "syntax error: register not expected";
                }
              else if (system_register_name (&ex)
                       && (operand->flags & V850_OPERAND_SRG) == 0)
                {
                  errmsg = "syntax error: system register not expected";
                }
              else if (cc_name (&ex)
                       && (operand->flags & V850_OPERAND_CC) == 0)
                {
                  errmsg = "syntax error: condition code not expected";
                }
              else
                {
                  expression (& ex);
/* start-sanitize-v850e */
                  /* Special case:
                     If we are assembling a MOV instruction (or a CALLT.... :-)
                     and the immediate value does not fit into the bits available
                     and we are supporting V850e instructions
                     then create a fake error so that the next MOV instruction
                      will be selected.  This one has a 32 bit immediate field.  */

                  if (((insn & 0x07e0) == 0x0200)
                      && ex.X_op == O_constant
                      && (ex.X_add_number < (- (1 << (operand->bits - 1))) || ex.X_add_number > ((1 << operand->bits) - 1))
                      && support_v850e)
                    errmsg = "use bigger instruction";
/* end-sanitize-v850e */
                }

              if (errmsg)
                goto error;
                  
              switch (ex.X_op) 
                {
                case O_illegal:
                  errmsg = "illegal operand";
                  goto error;
                case O_absent:
                  errmsg = "missing operand";
                  goto error;
                case O_register:
                  if ((operand->flags & (V850_OPERAND_REG | V850_OPERAND_SRG)) == 0)
                    {
                      errmsg = "invalid operand";
                      goto error;
                    }
#if 0
                  if (ex.X_add_number == 0
                      && (operand->shift == 11))
                    {
                      as_warn ("register 0 being used as destination of instruction" );
                    }
#endif    
                  insn = v850_insert_operand (insn, operand, ex.X_add_number,
                                              (char *) NULL, 0);
                  break;

                case O_constant:
                  insn = v850_insert_operand (insn, operand, ex.X_add_number,
                                              (char *) NULL, 0);
                  break;

                default:
                  /* We need to generate a fixup for this expression.  */
                  if (fc >= MAX_INSN_FIXUPS)
                    as_fatal ("too many fixups");
                  fixups[fc].exp = ex;
                  fixups[fc].opindex = *opindex_ptr;
                  fixups[fc].reloc = BFD_RELOC_UNUSED;
                  ++fc;
                  break;
                }
            }

          str = input_line_pointer;
          input_line_pointer = hold;

          while (*str == ' ' || *str == ',' || *str == '[' || *str == ']'
                 || *str == ')')
            ++str;
        }
      match = 1;

    error:
      if (match == 0)
        {
          next_opcode = opcode + 1;
          if (next_opcode->opcode != 0 && !strcmp(next_opcode->name, opcode->name))
            {
              opcode = next_opcode;
              continue;
            }
          
          as_bad ("%s", errmsg);
          ignore_rest_of_line ();
          return;
        }
      break;
    }
      
  while (isspace (*str))
    ++str;

  if (*str != '\0')
    as_bad ("junk at end of line: `%s'", str);

  input_line_pointer = str;

  /* Write out the instruction.

     Four byte insns have an opcode with the two high bits on.  */ 
  if (relaxable && fc > 0)
    {
      f = frag_var (rs_machine_dependent, 6, 4, 0,
                    fixups[0].exp.X_add_symbol,
                    fixups[0].exp.X_add_number,
                    (char *)fixups[0].opindex);
      insn_size = 2;
      md_number_to_chars (f, insn, insn_size);
      md_number_to_chars (f + 2, 0, 4);
      fc = 0;
    }
  else 
    {
      if ((insn & 0x0600) == 0x0600)
        insn_size = 4;
      else
        insn_size = 2;

      /* Special case: 32 bit MOV */
      if ((insn & 0xffe0) == 0x0620)
        insn_size = 2;
      
      f = frag_more (insn_size);
      
      md_number_to_chars (f, insn, insn_size);

      if (extra_data_after_insn)
        {
          f = frag_more (extra_data_len);
          md_number_to_chars (f, extra_data, extra_data_len);

          extra_data_after_insn = false;
        }
    }

  /* Create any fixups.  At this point we do not use a
     bfd_reloc_code_real_type, but instead just use the
     BFD_RELOC_UNUSED plus the operand index.  This lets us easily
     handle fixups for any operand type, although that is admittedly
     not a very exciting feature.  We pick a BFD reloc type in
     md_apply_fix.  */
  for (i = 0; i < fc; i++)
    {
      const struct v850_operand *operand;

      operand = &v850_operands[fixups[i].opindex];
      if (fixups[i].reloc != BFD_RELOC_UNUSED)
        {
          reloc_howto_type *reloc_howto = bfd_reloc_type_lookup (stdoutput, fixups[i].reloc);
          int size;
          int offset;
          fixS *fixP;

          if (!reloc_howto)
            abort();
          
          size = bfd_get_reloc_size (reloc_howto);

          /* The "size" of a TDA_OFFSET reloc varies depending
             on what kind of instruction it's used in!  */
          if (reloc_howto->type == 11 && insn_size > 2)
            size = 2;

          if (size < 1 || size > 4)
            abort();

          offset = 4 - size;
          fixP = fix_new_exp (frag_now, f - frag_now->fr_literal + offset, size,
                              &fixups[i].exp, 
                              reloc_howto->pc_relative,
                              fixups[i].reloc);

          switch (fixups[i].reloc)
            {
            case BFD_RELOC_LO16:
            case BFD_RELOC_HI16:
            case BFD_RELOC_HI16_S:
              fixP->fx_no_overflow = 1;
              break;
            }
        }
      else
        {
          fix_new_exp (frag_now, f - frag_now->fr_literal, 4,
                       &fixups[i].exp,
                       1 /* FIXME: V850_OPERAND_RELATIVE ??? */,
                       ((bfd_reloc_code_real_type)
                        (fixups[i].opindex + (int) BFD_RELOC_UNUSED)));
        }
    }
}


/* if while processing a fixup, a reloc really needs to be created */
/* then it is done here */
                 
arelent *
tc_gen_reloc (seg, fixp)
     asection *seg;
     fixS *fixp;
{
  arelent *reloc;
  reloc = (arelent *) xmalloc (sizeof (arelent));
  reloc->sym_ptr_ptr = &fixp->fx_addsy->bsym;
  reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
  reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type);
  if (reloc->howto == (reloc_howto_type *) NULL)
    {
      as_bad_where (fixp->fx_file, fixp->fx_line,
                    "reloc %d not supported by object file format", (int)fixp->fx_r_type);
      return NULL;
    }
  reloc->addend = fixp->fx_addnumber;
  /*  printf("tc_gen_reloc: addr=%x  addend=%x\n", reloc->address, reloc->addend); */
  return reloc;
}

/* Assume everything will fit in two bytes, then expand as necessary.  */
int
md_estimate_size_before_relax (fragp, seg)
     fragS *fragp;
     asection *seg;
{
  fragp->fr_var = 4;
  return 2;
} 


long
md_pcrel_from (fixp)
     fixS *fixp;
{
  /* If the symbol is undefined, or in a section other than our own,
     then let the linker figure it out.  */
  if (fixp->fx_addsy != (symbolS *) NULL && ! S_IS_DEFINED (fixp->fx_addsy))
    {
      /* The symbol is undefined.  Let the linker figure it out.  */
      return 0;
    }
  return fixp->fx_frag->fr_address + fixp->fx_where;
}

int
md_apply_fix3 (fixp, valuep, seg)
     fixS *fixp;
     valueT *valuep;
     segT seg;
{
  valueT value;
  char *where;

  if (fixp->fx_addsy == (symbolS *) NULL)
    {
      value = *valuep;
      fixp->fx_done = 1;
    }
  else if (fixp->fx_pcrel)
    value = *valuep;
  else
    {
      value = fixp->fx_offset;
      if (fixp->fx_subsy != (symbolS *) NULL)
        {
          if (S_GET_SEGMENT (fixp->fx_subsy) == absolute_section)
            value -= S_GET_VALUE (fixp->fx_subsy);
          else
            {
              /* We don't actually support subtracting a symbol.  */
              as_bad_where (fixp->fx_file, fixp->fx_line,
                            "expression too complex");
            }
        }
    }

  /* printf("md_apply_fix: value=0x%x  type=%d\n",  value, fixp->fx_r_type); */

  if ((int) fixp->fx_r_type >= (int) BFD_RELOC_UNUSED)
    {
      int opindex;
      const struct v850_operand *operand;
      char *where;
      unsigned long insn;

      opindex = (int) fixp->fx_r_type - (int) BFD_RELOC_UNUSED;
      operand = &v850_operands[opindex];

      /* Fetch the instruction, insert the fully resolved operand
         value, and stuff the instruction back again.

         Note the instruction has been stored in little endian
         format!  */
      where = fixp->fx_frag->fr_literal + fixp->fx_where;

      insn = bfd_getl32((unsigned char *) where);
      insn = v850_insert_operand (insn, operand, (offsetT) value,
                                  fixp->fx_file, fixp->fx_line);
      bfd_putl32((bfd_vma) insn, (unsigned char *) where);

      if (fixp->fx_done)
        {
          /* Nothing else to do here. */
          return 1;
        }

      /* Determine a BFD reloc value based on the operand information.  
         We are only prepared to turn a few of the operands into relocs. */

      if (operand->bits == 22)
        fixp->fx_r_type = BFD_RELOC_V850_22_PCREL;
      else if (operand->bits == 9)
        fixp->fx_r_type = BFD_RELOC_V850_9_PCREL;
      else
        {
          as_bad_where(fixp->fx_file, fixp->fx_line,
                       "unresolved expression that must be resolved");
          fixp->fx_done = 1;
          return 1;
        }
    }
  else if (fixp->fx_done)
    {
      /* We still have to insert the value into memory!  */
      where = fixp->fx_frag->fr_literal + fixp->fx_where;
      if (fixp->fx_size == 1)
        *where = value & 0xff;
      if (fixp->fx_size == 2)
        bfd_putl16(value & 0xffff, (unsigned char *) where);
      if (fixp->fx_size == 4)
        bfd_putl32(value, (unsigned char *) where);
    }

  fixp->fx_addnumber = value;
  return 1;
}

\f
/* Insert an operand value into an instruction.  */

static unsigned long
v850_insert_operand (insn, operand, val, file, line)
     unsigned long insn;
     const struct v850_operand * operand;
     offsetT val;
     char *file;
     unsigned int line;
{
  if (operand->bits != 32)
    {
      long min, max;
      offsetT test;

      if ((operand->flags & V850_OPERAND_SIGNED) != 0)
        {
          max = (1 << (operand->bits - 1)) - 1;
          min = - (1 << (operand->bits - 1));
        }
      else
        {
          max = (1 << operand->bits) - 1;
          min = 0;
        }

      test = val;

      if (test < (offsetT) min || test > (offsetT) max)
        {
          const char * err =
            "operand out of range (%s not between %ld and %ld)";
          char buf[100];

          sprint_value (buf, test);
          if (file == (char *) NULL)
            as_warn (err, buf, min, max);
          else
            as_warn_where (file, line, err, buf, min, max);
        }
    }

  if (operand->insert)
    {
      const char * message = NULL;
      
      insn = (*operand->insert) (insn, val, & message);
      if (message != NULL)
        {
          if (file == (char *) NULL)
            as_warn (message);
          else
            as_warn_where (file, line, message);
        }
    }
  else
    insn |= (((long) val & ((1 << operand->bits) - 1)) << operand->shift);
  
  return insn;
}

/* Parse a cons expression.  We have to handle hi(), lo(), etc
   on the v850.  */
void
parse_cons_expression_v850 (exp)
  expressionS *exp;
{
  /* See if there's a reloc prefix like hi() we have to handle.  */
  hold_cons_reloc = v850_reloc_prefix ();

  /* Do normal expression parsing.  */
  expression (exp);
}

/* Create a fixup for a cons expression.  If parse_cons_expression_v850
   found a reloc prefix, then we use that reloc, else we choose an
   appropriate one based on the size of the expression.  */
void
cons_fix_new_v850 (frag, where, size, exp)
     fragS *frag;
     int where;
     int size;
     expressionS *exp;
{
  if (hold_cons_reloc == BFD_RELOC_UNUSED)
    {
      if (size == 4)
        hold_cons_reloc = BFD_RELOC_32;
      if (size == 2)
        hold_cons_reloc = BFD_RELOC_16;
      if (size == 1)
        hold_cons_reloc = BFD_RELOC_8;
    }

  if (exp != NULL)
    fix_new_exp (frag, where, size, exp, 0, hold_cons_reloc);
  else
    fix_new (frag, where, size, NULL, 0, 0, hold_cons_reloc);
}