osprey/cygnus/opcodes/d30v-dis.c

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/* Disassemble D30V instructions.
   Copyright 1997, 1998, 2000, 2001 Free Software Foundation, Inc.

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 2 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; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include <stdio.h>
#include "sysdep.h"
#include "opcode/d30v.h"
#include "dis-asm.h"
#include "opintl.h"

#define PC_MASK 0xFFFFFFFF

static int lookup_opcode PARAMS ((struct d30v_insn *insn, long num, int is_long));
static void print_insn PARAMS ((struct disassemble_info *info, bfd_vma memaddr, long long num,
         struct d30v_insn *insn, int is_long, int show_ext));
static int extract_value PARAMS ((long long num, struct d30v_operand *oper, int is_long));

int
print_insn_d30v (memaddr, info)
     bfd_vma memaddr;
     struct disassemble_info *info;
{
  int status, result;
  bfd_byte buffer[12];
  unsigned long in1, in2;
  struct d30v_insn insn;
  long long num;

  insn.form = (struct d30v_format *) NULL;

  info->bytes_per_line = 8;
  info->bytes_per_chunk = 4;
  info->display_endian = BFD_ENDIAN_BIG;

  status = (*info->read_memory_func) (memaddr, buffer, 4, info);
  if (status != 0)
    {
      (*info->memory_error_func) (status, memaddr, info);
      return -1;
    }
  in1 = bfd_getb32 (buffer);

  status = (*info->read_memory_func) (memaddr + 4, buffer, 4, info);
  if (status != 0)
    {
      info->bytes_per_line = 8;
      if (!(result = lookup_opcode (&insn, in1, 0)))
  (*info->fprintf_func) (info->stream, ".long\t0x%x", in1);
      else
  print_insn (info, memaddr, (long long) in1, &insn, 0, result);
      return 4;
    }
  in2 = bfd_getb32 (buffer);

  if (in1 & in2 & FM01)
    {
      /* LONG instruction.  */
      if (!(result = lookup_opcode (&insn, in1, 1)))
  {
    (*info->fprintf_func) (info->stream, ".long\t0x%x,0x%x", in1, in2);
    return 8;
  }
      num = (long long) in1 << 32 | in2;
      print_insn (info, memaddr, num, &insn, 1, result);
    }
  else
    {
      num = in1;
      if (!(result = lookup_opcode (&insn, in1, 0)))
  (*info->fprintf_func) (info->stream, ".long\t0x%x", in1);
      else
  print_insn (info, memaddr, num, &insn, 0, result);

      switch (((in1 >> 31) << 1) | (in2 >> 31))
  {
  case 0:
    (*info->fprintf_func) (info->stream, "\t||\t");
    break;
  case 1:
    (*info->fprintf_func) (info->stream, "\t->\t");
    break;
  case 2:
    (*info->fprintf_func) (info->stream, "\t<-\t");
  default:
    break;
  }

      insn.form = (struct d30v_format *) NULL;
      num = in2;
      if (!(result = lookup_opcode (&insn, in2, 0)))
  (*info->fprintf_func) (info->stream, ".long\t0x%x", in2);
      else
  print_insn (info, memaddr, num, &insn, 0, result);
    }
  return 8;
}

/* Return 0 if lookup fails,
   1 if found and only one form,
   2 if found and there are short and long forms.  */

static int
lookup_opcode (insn, num, is_long)
     struct d30v_insn *insn;
     long num;
     int is_long;
{
  int i = 0, index;
  struct d30v_format *f;
  struct d30v_opcode *op = (struct d30v_opcode *) d30v_opcode_table;
  int op1 = (num >> 25) & 0x7;
  int op2 = (num >> 20) & 0x1f;
  int mod = (num >> 18) & 0x3;

  /* Find the opcode.  */
  do
    {
      if ((op->op1 == op1) && (op->op2 == op2))
  break;
      op++;
    }
  while (op->name);

  if (!op || !op->name)
    return 0;

  while (op->op1 == op1 && op->op2 == op2)
    {
      /* Scan through all the formats for the opcode.  */
      index = op->format[i++];
      do
  {
    f = (struct d30v_format *) &d30v_format_table[index];
    while (f->form == index)
      {
        if ((!is_long || f->form >= LONG) && (f->modifier == mod))
    {
      insn->form = f;
      break;
    }
        f++;
      }
    if (insn->form)
      break;
  }
      while ((index = op->format[i++]) != 0);
      if (insn->form)
  break;
      op++;
      i = 0;
    }
  if (insn->form == NULL)
    return 0;

  insn->op = op;
  insn->ecc = (num >> 28) & 0x7;
  if (op->format[1])
    return 2;
  else
    return 1;
}

static void
print_insn (info, memaddr, num, insn, is_long, show_ext)
     struct disassemble_info *info;
     bfd_vma memaddr;
     long long num;
     struct d30v_insn *insn;
     int is_long;
     int show_ext;
{
  int val, opnum, need_comma = 0;
  struct d30v_operand *oper;
  int i, match, opind = 0, need_paren = 0, found_control = 0;

  (*info->fprintf_func) (info->stream, "%s", insn->op->name);

  /* Check for CMP or CMPU.  */
  if (d30v_operand_table[insn->form->operands[0]].flags & OPERAND_NAME)
    {
      opind++;
      val =
  extract_value (num,
           (struct d30v_operand *) &d30v_operand_table[insn->form->operands[0]],
           is_long);
      (*info->fprintf_func) (info->stream, "%s", d30v_cc_names[val]);
    }

  /* Add in ".s" or ".l".  */
  if (show_ext == 2)
    {
      if (is_long)
  (*info->fprintf_func) (info->stream, ".l");
      else
  (*info->fprintf_func) (info->stream, ".s");
    }

  if (insn->ecc)
    (*info->fprintf_func) (info->stream, "/%s", d30v_ecc_names[insn->ecc]);

  (*info->fprintf_func) (info->stream, "\t");

  while ((opnum = insn->form->operands[opind++]) != 0)
    {
      int bits;
      oper = (struct d30v_operand *) &d30v_operand_table[opnum];
      bits = oper->bits;
      if (oper->flags & OPERAND_SHIFT)
  bits += 3;

      if (need_comma
    && oper->flags != OPERAND_PLUS
    && oper->flags != OPERAND_MINUS)
  {
    need_comma = 0;
    (*info->fprintf_func) (info->stream, ", ");
  }

      if (oper->flags == OPERAND_ATMINUS)
  {
    (*info->fprintf_func) (info->stream, "@-");
    continue;
  }
      if (oper->flags == OPERAND_MINUS)
  {
    (*info->fprintf_func) (info->stream, "-");
    continue;
  }
      if (oper->flags == OPERAND_PLUS)
  {
    (*info->fprintf_func) (info->stream, "+");
    continue;
  }
      if (oper->flags == OPERAND_ATSIGN)
  {
    (*info->fprintf_func) (info->stream, "@");
    continue;
  }
      if (oper->flags == OPERAND_ATPAR)
  {
    (*info->fprintf_func) (info->stream, "@(");
    need_paren = 1;
    continue;
  }

      if (oper->flags == OPERAND_SPECIAL)
  continue;

      val = extract_value (num, oper, is_long);

      if (oper->flags & OPERAND_REG)
  {
    match = 0;
    if (oper->flags & OPERAND_CONTROL)
      {
        struct d30v_operand *oper3 =
    (struct d30v_operand *) &d30v_operand_table[insn->form->operands[2]];
        int id = extract_value (num, oper3, is_long);
        found_control = 1;
        switch (id)
    {
    case 0:
      val |= OPERAND_CONTROL;
      break;
    case 1:
    case 2:
      val = OPERAND_CONTROL + MAX_CONTROL_REG + id;
      break;
    case 3:
      val |= OPERAND_FLAG;
      break;
    default:
      fprintf (stderr, "illegal id (%d)\n", id);
    }
      }
    else if (oper->flags & OPERAND_ACC)
      val |= OPERAND_ACC;
    else if (oper->flags & OPERAND_FLAG)
      val |= OPERAND_FLAG;
    for (i = 0; i < reg_name_cnt (); i++)
      {
        if (val == pre_defined_registers[i].value)
    {
      if (pre_defined_registers[i].pname)
        (*info->fprintf_func)
          (info->stream, "%s", pre_defined_registers[i].pname);
      else
        (*info->fprintf_func)
          (info->stream, "%s", pre_defined_registers[i].name);
      match = 1;
      break;
    }
      }
    if (match == 0)
      {
        /* This would only get executed if a register was not in
     the register table.  */
        (*info->fprintf_func)
    (info->stream, _("<unknown register %d>"), val & 0x3F);
      }
  }
      /* repeati has a relocation, but its first argument is a plain
   immediate.  OTOH instructions like djsri have a pc-relative
   delay target, but an absolute jump target.  Therefore, a test
   of insn->op->reloc_flag is not specific enough; we must test
   if the actual operand we are handling now is pc-relative.  */
      else if (oper->flags & OPERAND_PCREL)
  {
    int neg = 0;

    /* IMM6S3 is unsigned.  */
    if (oper->flags & OPERAND_SIGNED || bits == 32)
      {
        long max;
        max = (1 << (bits - 1));
        if (val & max)
    {
      if (bits == 32)
        val = -val;
      else
        val = -val & ((1 << bits) - 1);
      neg = 1;
    }
      }
    if (neg)
      {
        (*info->fprintf_func) (info->stream, "-%x\t(", val);
        (*info->print_address_func) ((memaddr - val) & PC_MASK, info);
        (*info->fprintf_func) (info->stream, ")");
      }
    else
      {
        (*info->fprintf_func) (info->stream, "%x\t(", val);
        (*info->print_address_func) ((memaddr + val) & PC_MASK, info);
        (*info->fprintf_func) (info->stream, ")");
      }
  }
      else if (insn->op->reloc_flag == RELOC_ABS)
  {
    (*info->print_address_func) (val, info);
  }
      else
  {
    if (oper->flags & OPERAND_SIGNED)
      {
        int max = (1 << (bits - 1));
        if (val & max)
    {
      val = -val;
      if (bits < 32)
        val &= ((1 << bits) - 1);
      (*info->fprintf_func) (info->stream, "-");
    }
      }
    (*info->fprintf_func) (info->stream, "0x%x", val);
  }
      /* If there is another operand, then write a comma and space.  */
      if (insn->form->operands[opind] && !(found_control && opind == 2))
  need_comma = 1;
    }
  if (need_paren)
    (*info->fprintf_func) (info->stream, ")");
}

static int
extract_value (num, oper, is_long)
     long long num;
     struct d30v_operand *oper;
     int is_long;
{
  int val;
  int shift = 12 - oper->position;
  int mask = (0xFFFFFFFF >> (32 - oper->bits));

  if (is_long)
    {
      if (oper->bits == 32)
  {
    /* Piece together 32-bit constant.  */
    val = ((num & 0x3FFFF)
     | ((num & 0xFF00000) >> 2)
     | ((num & 0x3F00000000LL) >> 6));
  }
      else
  val = (num >> (32 + shift)) & mask;
    }
  else
    val = (num >> shift) & mask;

  if (oper->flags & OPERAND_SHIFT)
    val <<= 3;

  return val;
}

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