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

     Copyright 1994, 1995, 2000, 2001, 2002, 2003, 2004, 2005, 2006
     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, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */

  #include <asm/cputable.h>

  #include "nonstdio.h"
  #include "ansidecl.h"
  #include "ppc.h"

  #include "dis-asm.h"

  
  /* Print a PowerPC or POWER instruction.  */
  
  int

  print_insn_powerpc (unsigned long insn, unsigned long memaddr)

  {
    const struct powerpc_opcode *opcode;
    const struct powerpc_opcode *opcode_end;
    unsigned long op;

    int dialect;

    dialect = PPC_OPCODE_PPC | PPC_OPCODE_CLASSIC | PPC_OPCODE_COMMON

  	      | PPC_OPCODE_64 | PPC_OPCODE_POWER4 | PPC_OPCODE_ALTIVEC;

    if (cpu_has_feature(CPU_FTRS_POWER5))
      dialect |= PPC_OPCODE_POWER5;
  
    if (cpu_has_feature(CPU_FTRS_CELL))
      dialect |= PPC_OPCODE_CELL | PPC_OPCODE_ALTIVEC;
  
    if (cpu_has_feature(CPU_FTRS_POWER6))
      dialect |= PPC_OPCODE_POWER5 | PPC_OPCODE_POWER6 | PPC_OPCODE_ALTIVEC;

    /* 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;
   again:
    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, dialect, &invalid);
  	}
        if (invalid)
  	continue;
  
        /* The instruction is valid.  */
        printf("%s", opcode->name);
        if (opcode->operands[0] != 0)
  	printf("\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, dialect, &invalid);
  	  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)
  	    {
  	      printf(",");
  	      need_comma = 0;
  	    }
  
  	  /* Print the operand as directed by the flags.  */

  	  if ((operand->flags & PPC_OPERAND_GPR) != 0
  	      || ((operand->flags & PPC_OPERAND_GPR_0) != 0 && value != 0))

  	    printf("r%ld", value);
  	  else if ((operand->flags & PPC_OPERAND_FPR) != 0)
  	    printf("f%ld", value);
  	  else if ((operand->flags & PPC_OPERAND_VR) != 0)
  	    printf("v%ld", value);
  	  else if ((operand->flags & PPC_OPERAND_RELATIVE) != 0)
  	    print_address (memaddr + value);
  	  else if ((operand->flags & PPC_OPERAND_ABSOLUTE) != 0)
  	    print_address (value & 0xffffffff);
  	  else if ((operand->flags & PPC_OPERAND_CR) == 0
  		   || (dialect & PPC_OPCODE_PPC) == 0)
  	    printf("%ld", value);
  	  else
  	    {
  	      if (operand->bits == 3)

  		printf("cr%ld", value);

  	      else
  		{
  		  static const char *cbnames[4] = { "lt", "gt", "eq", "so" };
  		  int cr;
  		  int cc;
  
  		  cr = value >> 2;
  		  if (cr != 0)
  		    printf("4*cr%d+", cr);
  		  cc = value & 3;
  		  printf("%s", cbnames[cc]);
  		}
  	    }
  
  	  if (need_paren)
  	    {
  	      printf(")");
  	      need_paren = 0;
  	    }
  
  	  if ((operand->flags & PPC_OPERAND_PARENS) == 0)
  	    need_comma = 1;
  	  else
  	    {
  	      printf("(");
  	      need_paren = 1;
  	    }
  	}
  
        /* We have found and printed an instruction; return.  */
        return 4;
      }
  
    if ((dialect & PPC_OPCODE_ANY) != 0)
      {
        dialect = ~PPC_OPCODE_ANY;
        goto again;
      }
  
    /* We could not find a match.  */
    printf(".long 0x%lx", insn);
  
    return 4;
  }