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/* vax-inst.h - GNU - Part of vax.c

   Copyright 1987, 1992, 1995, 2000, 2002, 2005, 2007

   Free Software Foundation, Inc.

   This file is part of GAS, the GNU Assembler.

   GAS is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3, or (at your option)

   any later version.

   GAS 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 GAS; see the file COPYING.  If not, write to

   the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */

/*

 * This is part of vax-ins-parse.c & friends.

 * We want to parse a vax instruction text into a tree defined here.

 */

#define VIT_MAX_OPERANDS (6)    /* maximum number of operands in one       */

/* single vax instruction */

struct vop                      /* vax instruction operand                 */

{

  short int vop_ndx;            /* -1, or index register. eg 7=[R7]        */

  short int vop_reg;            /* -1, or register number. eg @I^#=0xF     */

  /* Helps distinguish "abs" from "abs(PC)".  */

  short int vop_mode;           /* addressing mode 4 bits. eg I^#=0x9      */

  char vop_short;               /* operand displacement length as written  */

  /* ' '=none, "bilsw"=B^I^L^S^W^.           */

  char vop_access;              /* 'b'branch ' 'no-instruction 'amrvw'norm */

  char vop_width;               /* Operand width, one of "bdfghloqw"       */

  const char *vop_warn;         /* warning message of this operand, if any */

  const char *vop_error;        /* say if operand is inappropriate         */

  char *vop_expr_begin;         /* Unparsed expression, 1st char ...       */

  char *vop_expr_end;           /* ... last char.                          */

  unsigned char vop_nbytes;     /* number of bytes in datum                */

};

typedef long vax_opcodeT;       /* For initialising array of opcodes       */

/* Some synthetic opcodes > 16 bits!       */

#define VIT_OPCODE_SYNTHETIC 0x80000000 /* Not real hardware instruction.  */

#define VIT_OPCODE_SPECIAL   0x40000000 /* Not normal branch optimising.   */

/* Never set without ..._SYNTHETIC */

#define VAX_WIDTH_UNCONDITIONAL_JUMP '-'        /* These are encoded into         */

#define VAX_WIDTH_CONDITIONAL_JUMP   '?'        /* vop_width when vop_access=='b' */

#define VAX_WIDTH_WORD_JUMP          '!'        /* and VIT_OPCODE_SYNTHETIC set.  */

#define VAX_WIDTH_BYTE_JUMP          ':'        /*                                */

#define VAX_JSB (0x16)          /* Jump to subroutine                      */

#define VAX_JMP (0x17)          /* Useful for branch optimising. Jump instr*/

#define VAX_PC_RELATIVE_MODE (0xef)     /* Use it after VAX_JMP            */

#define VAX_ABSOLUTE_MODE (0x9F)/* Use as @#...                    */

#define VAX_BRB (0x11)          /* Canonical branch.                       */

#define VAX_BRW (0x31)          /* Another canonical branch                */

#define VAX_CALLS (0xFB)        /* Call with arg list on stack             */

#define VAX_CALLG (0xFA)        /* Call with arg list in memory            */

#define VAX_WIDEN_WORD (0x20)   /* Add this to byte branch to get word br.  */

#define VAX_WIDEN_LONG (0x6)    /* Add this to byte branch to get long jmp.*/

/* Needs VAX_PC_RELATIVE_MODE byte after it*/

struct vit                      /* vax instruction tree                    */

{

  /* vit_opcode is char[] for portability.   */

  char vit_opcode[sizeof (vax_opcodeT)];

  unsigned char vit_opcode_nbytes;      /* How long is _opcode? (chars)    */

  unsigned char vit_operands;   /*                                         */

  struct vop vit_operand[VIT_MAX_OPERANDS];     /* operands             */

  const char *vit_error;        /* "" or error text */

};

/* end of vax-inst.h */