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/* mmix.h -- Header file for MMIX opcode table

   Copyright (C) 2001 Free Software Foundation, Inc.

   Written by Hans-Peter Nilsson (hp@bitrange.com)

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.  */

/* We could have just a char*[] table indexed by the register number, but

   that would not allow for synonyms.  The table is terminated with an

   entry with a NULL name.  */

struct mmix_spec_reg

{

  const char *name;

  unsigned int number;

};

/* General indication of the type of instruction.  */

enum mmix_insn_type

 {

   mmix_type_pseudo,

   mmix_type_normal,

   mmix_type_branch,

   mmix_type_condbranch,

   mmix_type_memaccess_octa,

   mmix_type_memaccess_tetra,

   mmix_type_memaccess_wyde,

   mmix_type_memaccess_byte,

   mmix_type_memaccess_block,

   mmix_type_jsr

 };

/* Type of operands an instruction takes.  Use when parsing assembly code

   and disassembling.  */

enum mmix_operands_type

 {

   mmix_operands_none = 0,

   /* All operands are registers: "$X,$Y,$Z".  */

   mmix_operands_regs,

   /* "$X,YZ", like SETH.  */

   mmix_operands_reg_yz,

   /* The regular "$X,$Y,$Z|Z".

      The Z is optional; if only "$X,$Y" is given, then "$X,$Y,0" is

      assumed.  */

   mmix_operands_regs_z_opt,

   /* The regular "$X,$Y,$Z|Z".  */

   mmix_operands_regs_z,

   /* "Address"; only JMP.  Zero operands allowed unless GNU syntax.  */

   mmix_operands_jmp,

   /* "$X|X,$Y,$Z|Z": PUSHGO; like "3", but X can be expressed as an

      integer.  */

   mmix_operands_pushgo,

   /* Two registers or a register and a byte, like FLOT, possibly with

      rounding: "$X,$Z|Z" or "$X,ROUND_MODE,$Z|Z".  */

   mmix_operands_roundregs_z,

   /* "X,YZ", POP.  Unless GNU syntax, zero or one operand is allowed.  */

   mmix_operands_pop,

   /* Two registers, possibly with rounding: "$X,$Z" or

      "$X,ROUND_MODE,$Z".  */

   mmix_operands_roundregs,

   /* "XYZ", like SYNC.  */

   mmix_operands_sync,

   /* "X,$Y,$Z|Z", like SYNCD.  */

   mmix_operands_x_regs_z,

   /* "$X,Y,$Z|Z", like NEG and NEGU.  The Y field is optional, default 0.  */

   mmix_operands_neg,

   /* "$X,Address, like GETA or branches.  */

   mmix_operands_regaddr,

   /* "$X|X,Address, like PUSHJ.  */

   mmix_operands_pushj,

   /* "$X,spec_reg"; GET.  */

   mmix_operands_get,

   /* "spec_reg,$Z|Z"; PUT.  */

   mmix_operands_put,

   /* Two registers, "$X,$Y".  */

   mmix_operands_set,

   /* "$X,0"; SAVE.  */

   mmix_operands_save,

   /* "0,$Z"; UNSAVE. */

   mmix_operands_unsave,

   /* "X,Y,Z"; like SWYM or TRAP.  Zero (or 1 if GNU syntax) to three

      operands, interpreted as 0; XYZ; X, YZ and X, Y, Z.  */

   mmix_operands_xyz_opt,

   /* Just "Z", like RESUME.  Unless GNU syntax, the operand can be omitted

      and will then be assumed zero.  */

   mmix_operands_resume,

   /* These are specials to handle that pseudo-directives are specified

      like ordinary insns when being mmixal-compatible.  They signify the

      specific pseudo-directive rather than the operands type.  */

   /* LOC.  */

   mmix_operands_loc,

   /* PREFIX.  */

   mmix_operands_prefix,

   /* BYTE.  */

   mmix_operands_byte,

   /* WYDE.  */

   mmix_operands_wyde,

   /* TETRA.  */

   mmix_operands_tetra,

   /* OCTA.  */

   mmix_operands_octa,

   /* LOCAL.  */

   mmix_operands_local,

   /* BSPEC.  */

   mmix_operands_bspec,

   /* ESPEC.  */

   mmix_operands_espec,

 };

struct mmix_opcode

 {

   const char *name;

   unsigned long match;

   unsigned long lose;

   enum mmix_operands_type operands;

   /* This is used by the disassembly function.  */

   enum mmix_insn_type type;

 };

/* Declare the actual tables.  */

extern const struct mmix_opcode mmix_opcodes[];

/* This one is terminated with an entry with a NULL name.  */

extern const struct mmix_spec_reg mmix_spec_regs[];

/* Some insn values we use when padding and synthesizing address loads.  */

#define IMM_OFFSET_BIT 1

#define COND_INV_BIT 0x8

#define PRED_INV_BIT 0x10

#define PUSHGO_INSN_BYTE 0xbe

#define GO_INSN_BYTE 0x9e

#define SETL_INSN_BYTE 0xe3

#define INCML_INSN_BYTE 0xe6

#define INCMH_INSN_BYTE 0xe5

#define INCH_INSN_BYTE 0xe4

#define SWYM_INSN_BYTE 0xfd

/* We can have 256 - 32 (local registers) - 1 ($255 is not allocatable)

   global registers.  */

#define MAX_GREGS 223