gas/config/vax-inst.h

   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 */