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/* alpha-dis.c -- Disassemble Alpha AXP instructions

   Copyright 1996, 1999 Free Software Foundation, Inc.

   Contributed by Richard Henderson <rth@tamu.edu>,

   patterned after the PPC opcode handling written by Ian Lance Taylor.

This file is part of GDB, GAS, and the GNU binutils.

GDB, GAS, and the GNU binutils are free software; you can redistribute

them and/or modify them 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.

GDB, GAS, and the GNU binutils are distributed in the hope that they

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 file; 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 "ansidecl.h"

#include "sysdep.h"

#include "dis-asm.h"

#include "opcode/alpha.h"

/* OSF register names.  */

static const char * const osf_regnames[64] =

{

  "v0", "t0", "t1", "t2", "t3", "t4", "t5", "t6",

  "t7", "s0", "s1", "s2", "s3", "s4", "s5", "fp",

  "a0", "a1", "a2", "a3", "a4", "a5", "t8", "t9",

  "t10", "t11", "ra", "t12", "at", "gp", "sp", "zero",

  "$f0", "$f1", "$f2", "$f3", "$f4", "$f5", "$f6", "$f7",

  "$f8", "$f9", "$f10", "$f11", "$f12", "$f13", "$f14", "$f15",

  "$f16", "$f17", "$f18", "$f19", "$f20", "$f21", "$f22", "$f23",

  "$f24", "$f25", "$f26", "$f27", "$f28", "$f29", "$f30", "$f31"

};

/* VMS register names.  */

static const char * const vms_regnames[64] =

{

  "R0", "R1", "R2", "R3", "R4", "R5", "R6", "R7",

  "R8", "R9", "R10", "R11", "R12", "R13", "R14", "R15",

  "R16", "R17", "R18", "R19", "R20", "R21", "R22", "R23",

  "R24", "AI", "RA", "PV", "AT", "FP", "SP", "RZ",

  "F0", "F1", "F2", "F3", "F4", "F5", "F6", "F7",

  "F8", "F9", "F10", "F11", "F12", "F13", "F14", "F15",

  "F16", "F17", "F18", "F19", "F20", "F21", "F22", "F23",

  "F24", "F25", "F26", "F27", "F28", "F29", "F30", "FZ"

};

/* Disassemble Alpha instructions.  */

int

print_insn_alpha (memaddr, info)

     bfd_vma memaddr;

     struct disassemble_info *info;

{

  static const struct alpha_opcode *opcode_index[AXP_NOPS+1];

  const char * const * regnames;

  const struct alpha_opcode *opcode, *opcode_end;

  const unsigned char *opindex;

  unsigned insn, op, isa_mask;

  int need_comma;

  /* Initialize the majorop table the first time through */

  if (!opcode_index[0])

    {

      opcode = alpha_opcodes;

      opcode_end = opcode + alpha_num_opcodes;

      for (op = 0; op < AXP_NOPS; ++op)

        {

          opcode_index[op] = opcode;

          while (opcode < opcode_end && op == AXP_OP (opcode->opcode))

            ++opcode;

        }

      opcode_index[op] = opcode;

    }

  if (info->flavour == bfd_target_evax_flavour)

    regnames = vms_regnames;

  else

    regnames = osf_regnames;

  isa_mask = AXP_OPCODE_NOPAL;

  switch (info->mach)

    {

    case bfd_mach_alpha_ev4:

      isa_mask |= AXP_OPCODE_EV4;

      break;

    case bfd_mach_alpha_ev5:

      isa_mask |= AXP_OPCODE_EV5;

      break;

    case bfd_mach_alpha_ev6:

      isa_mask |= AXP_OPCODE_EV6;

      break;

    }

  /* Read the insn into a host word */

  {

    bfd_byte buffer[4];

    int status = (*info->read_memory_func) (memaddr, buffer, 4, info);

    if (status != 0)

      {

        (*info->memory_error_func) (status, memaddr, info);

        return -1;

      }

    insn = bfd_getl32 (buffer);

  }

  /* Get the major opcode of the instruction.  */

  op = AXP_OP (insn);

  /* Find the first match in the opcode table.  */

  opcode_end = opcode_index[op+1];

  for (opcode = opcode_index[op]; opcode < opcode_end; ++opcode)

    {

      if ((insn & opcode->mask) != opcode->opcode)

        continue;

      if (!(opcode->flags & isa_mask))

        continue;

      /* Make two passes over the operands.  First see if any of them

         have extraction functions, and, if they do, make sure the

         instruction is valid.  */

      {

        int invalid = 0;

        for (opindex = opcode->operands; *opindex != 0; opindex++)

          {

            const struct alpha_operand *operand = alpha_operands + *opindex;

            if (operand->extract)

              (*operand->extract) (insn, &invalid);

          }

        if (invalid)

          continue;

      }

      /* The instruction is valid.  */

      goto found;

    }

  /* No instruction found */

  (*info->fprintf_func) (info->stream, ".long %#08x", insn);

  return 4;

found:

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

  if (opcode->operands[0] != 0)

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

  /* Now extract and print the operands.  */

  need_comma = 0;

  for (opindex = opcode->operands; *opindex != 0; opindex++)

    {

      const struct alpha_operand *operand = alpha_operands + *opindex;

      int value;

      /* Operands that are marked FAKE are simply ignored.  We

         already made sure that the extract function considered

         the instruction to be valid.  */

      if ((operand->flags & AXP_OPERAND_FAKE) != 0)

        continue;

      /* Extract the value from the instruction.  */

      if (operand->extract)

        value = (*operand->extract) (insn, (int *) NULL);

      else

        {

          value = (insn >> operand->shift) & ((1 << operand->bits) - 1);

          if (operand->flags & AXP_OPERAND_SIGNED)

            {

              int signbit = 1 << (operand->bits - 1);

              value = (value ^ signbit) - signbit;

            }

        }

      if (need_comma &&

          ((operand->flags & (AXP_OPERAND_PARENS|AXP_OPERAND_COMMA))

           != AXP_OPERAND_PARENS))

        {

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

        }

      if (operand->flags & AXP_OPERAND_PARENS)

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

      /* Print the operand as directed by the flags.  */

      if (operand->flags & AXP_OPERAND_IR)

        (*info->fprintf_func) (info->stream, "%s", regnames[value]);

      else if (operand->flags & AXP_OPERAND_FPR)

        (*info->fprintf_func) (info->stream, "%s", regnames[value+32]);

      else if (operand->flags & AXP_OPERAND_RELATIVE)

        (*info->print_address_func) (memaddr + 4 + value, info);

      else if (operand->flags & AXP_OPERAND_SIGNED)

        (*info->fprintf_func) (info->stream, "%d", value);

      else

        (*info->fprintf_func) (info->stream, "%#x", value);

      if (operand->flags & AXP_OPERAND_PARENS)

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

      need_comma = 1;

    }

  return 4;

}