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/* ppc-dis.c -- Disassemble PowerPC instructions

   Copyright 1994 Free Software Foundation, Inc.

   Written by Ian Lance Taylor, Cygnus Support

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/ppc.h"

/* This file provides several disassembler functions, all of which use

   the disassembler interface defined in dis-asm.h.  Several functions

   are provided because this file handles disassembly for the PowerPC

   in both big and little endian mode and also for the POWER (RS/6000)

   chip.  */

static int print_insn_powerpc PARAMS ((bfd_vma, struct disassemble_info *,

                                       int bigendian, int dialect));

/* Print a big endian PowerPC instruction.  For convenience, also

   disassemble instructions supported by the Motorola PowerPC 601.  */

int

print_insn_big_powerpc (memaddr, info)

     bfd_vma memaddr;

     struct disassemble_info *info;

{

  return print_insn_powerpc (memaddr, info, 1,

                             PPC_OPCODE_PPC | PPC_OPCODE_601);

}

/* Print a little endian PowerPC instruction.  For convenience, also

   disassemble instructions supported by the Motorola PowerPC 601.  */

int

print_insn_little_powerpc (memaddr, info)

     bfd_vma memaddr;

     struct disassemble_info *info;

{

  return print_insn_powerpc (memaddr, info, 0,

                             PPC_OPCODE_PPC | PPC_OPCODE_601);

}

/* Print a POWER (RS/6000) instruction.  */

int

print_insn_rs6000 (memaddr, info)

     bfd_vma memaddr;

     struct disassemble_info *info;

{

  return print_insn_powerpc (memaddr, info, 1, PPC_OPCODE_POWER);

}

/* Print a PowerPC or POWER instruction.  */

static int

print_insn_powerpc (memaddr, info, bigendian, dialect)

     bfd_vma memaddr;

     struct disassemble_info *info;

     int bigendian;

     int dialect;

{

  bfd_byte buffer[4];

  int status;

  unsigned long insn;

  const struct powerpc_opcode *opcode;

  const struct powerpc_opcode *opcode_end;

  unsigned long op;

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

  if (status != 0)

    {

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

      return -1;

    }

  if (bigendian)

    insn = bfd_getb32 (buffer);

  else

    insn = bfd_getl32 (buffer);

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

  op = PPC_OP (insn);

  /* Find the first match in the opcode table.  We could speed this up

     a bit by doing a binary search on the major opcode.  */

  opcode_end = powerpc_opcodes + powerpc_num_opcodes;

  for (opcode = powerpc_opcodes; opcode < opcode_end; opcode++)

    {

      unsigned long table_op;

      const unsigned char *opindex;

      const struct powerpc_operand *operand;

      int invalid;

      int need_comma;

      int need_paren;

      table_op = PPC_OP (opcode->opcode);

      if (op < table_op)

        break;

      if (op > table_op)

        continue;

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

          || (opcode->flags & dialect) == 0)

        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.  */

      invalid = 0;

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

        {

          operand = powerpc_operands + *opindex;

          if (operand->extract)

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

        }

      if (invalid)

        continue;

      /* The instruction is valid.  */

      (*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;

      need_paren = 0;

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

        {

          long value;

          operand = powerpc_operands + *opindex;

          /* 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 & PPC_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 & PPC_OPERAND_SIGNED) != 0

                  && (value & (1 << (operand->bits - 1))) != 0)

                value -= 1 << operand->bits;

            }

          /* If the operand is optional, and the value is zero, don't

             print anything.  */

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

              && (operand->flags & PPC_OPERAND_NEXT) == 0

              && value == 0)

            continue;

          if (need_comma)

            {

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

              need_comma = 0;

            }

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

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

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

          else if ((operand->flags & PPC_OPERAND_FPR) != 0)

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

          else if ((operand->flags & PPC_OPERAND_RELATIVE) != 0)

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

          else if ((operand->flags & PPC_OPERAND_ABSOLUTE) != 0)

            (*info->print_address_func) ((bfd_vma) value & 0xffffffff, info);

          else if ((operand->flags & PPC_OPERAND_CR) == 0

                   || (dialect & PPC_OPCODE_PPC) == 0)

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

          else

            {

              if (operand->bits == 3)

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

              else

                {

                  static const char *cbnames[4] = { "lt", "gt", "eq", "so" };

                  int cr;

                  int cc;

                  cr = value >> 2;

                  if (cr != 0)

                    (*info->fprintf_func) (info->stream, "4*cr%d", cr);

                  cc = value & 3;

                  if (cc != 0)

                    {

                      if (cr != 0)

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

                      (*info->fprintf_func) (info->stream, "%s", cbnames[cc]);

                    }

                }

            }

          if (need_paren)

            {

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

              need_paren = 0;

            }

          if ((operand->flags & PPC_OPERAND_PARENS) == 0)

            need_comma = 1;

          else

            {

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

              need_paren = 1;

            }

        }

      /* We have found and printed an instruction; return.  */

      return 4;

    }

  /* We could not find a match.  */

  (*info->fprintf_func) (info->stream, ".long 0x%lx", insn);

  return 4;

}