ppcopc.h

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/*
 *      HT Editor
 *      ppcopc.cc
 *
 *      Copyright (C) 1999-2002 Sebastian Biallas (sb@web-productions.de)
 *      Copyright 1994 Free Software Foundation, Inc.
 *      Written by Ian Lance Taylor, Cygnus Support
 *
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License version 2 as
 *      published by the Free Software Foundation.
 *
 *      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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef __PPC_OPC_H__
#define __PPC_OPC_H__

#include "global.h"

/* The opcode table is an array of struct powerpc_opcode.  */
struct powerpc_opcode
{
  /* The opcode name.  */
  const char *name;

  /* The opcode itself.  Those bits which will be filled in with
     operands are zeroes.  */
  uint32 opcode;

  /* The opcode mask.  This is used by the disassembler.  This is a
     mask containing ones indicating those bits which must match the
     opcode field, and zeroes indicating those bits which need not
     match (and are presumably filled in by operands).  */
  uint32 mask;

  /* One bit flags for the opcode.  These are used to indicate which
     specific processors support the instructions.  The defined values
     are listed below.  */
  uint32 flags;

  /* An array of operand codes.  Each code is an index into the
     operand table.  They appear in the order which the operands must
     appear in assembly code, and are terminated by a zero.  */
  byte operands[8];
};

/* The table itself is sorted by major opcode number, and is otherwise
   in the order in which the disassembler should consider
   instructions.  */
extern const struct powerpc_opcode powerpc_opcodes[];
extern const int powerpc_num_opcodes;

/* Values defined for the flags field of a struct powerpc_opcode.  */

/* Opcode is defined for the PowerPC architecture.  */
#define PPC_OPCODE_PPC (01)

/* Opcode is defined for the POWER (RS/6000) architecture.  */
#define PPC_OPCODE_POWER (02)

/* Opcode is defined for the POWER2 (Rios 2) architecture.  */
#define PPC_OPCODE_POWER2 (04)

/* Opcode is only defined on 32 bit architectures.  */
#define PPC_OPCODE_32 (010)

/* Opcode is only defined on 64 bit architectures.  */
#define PPC_OPCODE_64 (020)

/* Opcode is supported by the Motorola PowerPC 601 processor.  The 601
   is assumed to support all PowerPC (PPC_OPCODE_PPC) instructions,
   but it also supports many additional POWER instructions.  */
#define PPC_OPCODE_601 (040)

/* A macro to extract the major opcode from an instruction.  */
#define PPC_OP(i) (((i) >> 26) & 0x3f)

/* The operands table is an array of struct powerpc_operand.  */

struct powerpc_operand
{
  /* The number of bits in the operand.  */
  byte bits;

  /* How far the operand is left shifted in the instruction.  */
  byte shift;

  /* Extraction function.  This is used by the disassembler.  To
     extract this operand type from an instruction, check this field.

     If it is NULL, compute
         op = ((i) >> o->shift) & ((1 << o->bits) - 1);
         if ((o->flags & PPC_OPERAND_SIGNED) != 0
             && (op & (1 << (o->bits - 1))) != 0)
           op -= 1 << o->bits;
     (i is the instruction, o is a pointer to this structure, and op
     is the result; this assumes twos complement arithmetic).

     If this field is not NULL, then simply call it with the
     instruction value.  It will return the value of the operand.  If
     the INVALID argument is not NULL, *INVALID will be set to
     non-zero if this operand type can not actually be extracted from
     this operand (i.e., the instruction does not match).  If the
     operand is valid, *INVALID will not be changed.  */
  uint32 (*extract)(uint32 instruction, bool *invalid);

  /* One bit syntax flags.  */
  uint32 flags;
};

/* Elements in the table are retrieved by indexing with values from
   the operands field of the powerpc_opcodes table.  */

extern const struct powerpc_operand powerpc_operands[];

/* Values defined for the flags field of a struct powerpc_operand.  */

/* This operand takes signed values.  */
#define PPC_OPERAND_SIGNED (01)

/* This operand takes signed values, but also accepts a full positive
   range of values when running in 32 bit mode.  That is, if bits is
   16, it takes any value from -0x8000 to 0xffff.  In 64 bit mode,
   this flag is ignored.  */
#define PPC_OPERAND_SIGNOPT (02)

/* This operand does not actually exist in the assembler input.  This
   is used to support extended mnemonics such as mr, for which two
   operands fields are identical.  The assembler should call the
   insert function with any op value.  The disassembler should call
   the extract function, ignore the return value, and check the value
   placed in the valid argument.  */
#define PPC_OPERAND_FAKE (04)

/* The next operand should be wrapped in parentheses rather than
   separated from this one by a comma.  This is used for the load and
   store instructions which want their operands to look like
       reg,displacement(reg)
   */
#define PPC_OPERAND_PARENS (010)

/* This operand may use the symbolic names for the CR fields, which
   are
       lt  0    gt  1   eq  2   so  3   un  3
       cr0 0    cr1 1   cr2 2   cr3 3
       cr4 4    cr5 5   cr6 6   cr7 7
   These may be combined arithmetically, as in cr2*4+gt.  These are
   only supported on the PowerPC, not the POWER.  */
#define PPC_OPERAND_CR (020)

/* This operand names a register.  The disassembler uses this to print
   register names with a leading 'r'.  */
#define PPC_OPERAND_GPR (040)

/* This operand names a floating point register.  The disassembler
   prints these with a leading 'f'.  */
#define PPC_OPERAND_FPR (0100)

/* This operand is a relative branch displacement.  The disassembler
   prints these symbolically if possible.  */
#define PPC_OPERAND_RELATIVE (0200)

/* This operand is an absolute branch address.  The disassembler
   prints these symbolically if possible.  */
#define PPC_OPERAND_ABSOLUTE (0400)

/* This operand is optional, and is zero if omitted.  This is used for
   the optional BF and L fields in the comparison instructions.  The
   assembler must count the number of operands remaining on the line,
   and the number of operands remaining for the opcode, and decide
   whether this operand is present or not.  The disassembler should
   print this operand out only if it is not zero.  */
#define PPC_OPERAND_OPTIONAL (01000)

/* This flag is only used with PPC_OPERAND_OPTIONAL.  If this operand
   is omitted, then for the next operand use this operand value plus
   1, ignoring the next operand field for the opcode.  This wretched
   hack is needed because the Power rotate instructions can take
   either 4 or 5 operands.  The disassembler should print this operand
   out regardless of the PPC_OPERAND_OPTIONAL field.  */
#define PPC_OPERAND_NEXT (02000)

/* This operand should be regarded as a negative number for the
   purposes of overflow checking (i.e., the normal most negative
   number is disallowed and one more than the normal most positive
   number is allowed).  This flag will only be set for a signed
   operand.  */
#define PPC_OPERAND_NEGATIVE (04000)

#endif

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