1 /* vax-inst.h - GNU - Part of vax.c 2 Copyright (C) 1987-2024 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 #define VAX_CALLS (0xFB) /* Call with arg list on stack */ 69 #define VAX_CALLG (0xFA) /* Call with arg list in memory */ 70 71 struct vit /* vax instruction tree */ 72 { 73 /* vit_opcode is char[] for portability. */ 74 char vit_opcode[sizeof (vax_opcodeT)]; 75 unsigned char vit_opcode_nbytes; /* How long is _opcode? (chars) */ 76 unsigned char vit_operands; /* */ 77 struct vop vit_operand[VIT_MAX_OPERANDS]; /* operands */ 78 const char *vit_error; /* "" or error text */ 79 }; 80 81 /* end of vax-inst.h */ 82