1  /* vax-inst.h - GNU - Part of vax.c
       2     Copyright (C) 1987-2023 Free Software Foundation, Inc.
       3  
       4     This file is part of GAS, the GNU Assembler.
       5  
       6     GAS is free software; you can redistribute it and/or modify
       7     it under the terms of the GNU General Public License as published by
       8     the Free Software Foundation; either version 3, or (at your option)
       9     any later version.
      10  
      11     GAS is distributed in the hope that it will be useful,
      12     but WITHOUT ANY WARRANTY; without even the implied warranty of
      13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14     GNU General Public License for more details.
      15  
      16     You should have received a copy of the GNU General Public License
      17     along with GAS; see the file COPYING.  If not, write to
      18     the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
      19  
      20  /*
      21   * This is part of vax-ins-parse.c & friends.
      22   * We want to parse a vax instruction text into a tree defined here.
      23   */
      24  
      25  #define VIT_MAX_OPERANDS (6)	/* maximum number of operands in one       */
      26  /* single vax instruction */
      27  
      28  struct vop			/* vax instruction operand                 */
      29  {
      30    short int vop_ndx;		/* -1, or index register. eg 7=[R7]	   */
      31    short int vop_reg;		/* -1, or register number. eg @I^#=0xF     */
      32    /* Helps distinguish "abs" from "abs(PC)".  */
      33    short int vop_mode;		/* addressing mode 4 bits. eg I^#=0x9	   */
      34    char vop_short;		/* operand displacement length as written  */
      35    /* ' '=none, "bilsw"=B^I^L^S^W^.           */
      36    char vop_access;		/* 'b'branch ' 'no-instruction 'amrvw'norm */
      37    char vop_width;		/* Operand width, one of "bdfghloqw"	   */
      38    const char *vop_warn;		/* warning message of this operand, if any */
      39    const char *vop_error;	/* say if operand is inappropriate         */
      40    char *vop_expr_begin;		/* Unparsed expression, 1st char ...	   */
      41    char *vop_expr_end;		/* ... last char.			   */
      42    unsigned char vop_nbytes;	/* number of bytes in datum		   */
      43  };
      44  
      45  typedef long vax_opcodeT;	/* For initialising array of opcodes	   */
      46  /* Some synthetic opcodes > 16 bits!       */
      47  
      48  #define VIT_OPCODE_SYNTHETIC 0x80000000	/* Not real hardware instruction.  */
      49  #define VIT_OPCODE_SPECIAL   0x40000000	/* Not normal branch optimising.   */
      50  /* Never set without ..._SYNTHETIC */
      51  
      52  #define VAX_WIDTH_UNCONDITIONAL_JUMP '-'	/* These are encoded into         */
      53  #define VAX_WIDTH_CONDITIONAL_JUMP   '?'	/* vop_width when vop_access=='b' */
      54  #define VAX_WIDTH_WORD_JUMP          '!'	/* and VIT_OPCODE_SYNTHETIC set.  */
      55  #define VAX_WIDTH_BYTE_JUMP	     ':'	/*                                */
      56  
      57  #define VAX_JSB (0x16)		/* Jump to subroutine			   */
      58  #define VAX_JMP (0x17)		/* Useful for branch optimising. Jump instr*/
      59  #define VAX_PC_RELATIVE_MODE (0xef)	/* Use it after VAX_JMP		   */
      60  #define VAX_ABSOLUTE_MODE (0x9F)/* Use as @#...			   */
      61  #define VAX_BRB (0x11)		/* Canonical branch.			   */
      62  #define VAX_BRW (0x31)		/* Another canonical branch		   */
      63  #define VAX_CALLS (0xFB)	/* Call with arg list on stack	           */
      64  #define VAX_CALLG (0xFA)	/* Call with arg list in memory		   */
      65  #define VAX_WIDEN_WORD (0x20)	/* Add this to byte branch to get word br.  */
      66  #define VAX_WIDEN_LONG (0x6)	/* Add this to byte branch to get long jmp.*/
      67  /* Needs VAX_PC_RELATIVE_MODE byte after it*/
      68  
      69  struct vit			/* vax instruction tree                    */
      70  {
      71    /* vit_opcode is char[] for portability.   */
      72    char vit_opcode[sizeof (vax_opcodeT)];
      73    unsigned char vit_opcode_nbytes;	/* How long is _opcode? (chars)	   */
      74    unsigned char vit_operands;	/*					   */
      75    struct vop vit_operand[VIT_MAX_OPERANDS];	/* operands             */
      76    const char *vit_error;	/* "" or error text */
      77  };
      78  
      79  /* end of vax-inst.h */