1 /* vax-inst.h - GNU - Part of vax.c 2 Copyright 1987, 1992, 1995, 2000, 2002, 2005, 2007 3 Free Software Foundation, Inc. 4 5 This file is part of GAS, the GNU Assembler. 6 7 GAS is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3, or (at your option) 10 any later version. 11 12 GAS is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with GAS; see the file COPYING. If not, write to 19 the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ 20 21 /* 22 * This is part of vax-ins-parse.c & friends. 23 * We want to parse a vax instruction text into a tree defined here. 24 */ 25 26 #define VIT_MAX_OPERANDS (6) /* maximum number of operands in one */ 27 /* single vax instruction */ 28 29 struct vop /* vax instruction operand */ 30 { 31 short int vop_ndx; /* -1, or index register. eg 7=[R7] */ 32 short int vop_reg; /* -1, or register number. eg @I^#=0xF */ 33 /* Helps distinguish "abs" from "abs(PC)". */ 34 short int vop_mode; /* addressing mode 4 bits. eg I^#=0x9 */ 35 char vop_short; /* operand displacement length as written */ 36 /* ' '=none, "bilsw"=B^I^L^S^W^. */ 37 char vop_access; /* 'b'branch ' 'no-instruction 'amrvw'norm */ 38 char vop_width; /* Operand width, one of "bdfghloqw" */ 39 const char *vop_warn; /* warning message of this operand, if any */ 40 const char *vop_error; /* say if operand is inappropriate */ 41 char *vop_expr_begin; /* Unparsed expression, 1st char ... */ 42 char *vop_expr_end; /* ... last char. */ 43 unsigned char vop_nbytes; /* number of bytes in datum */ 44 }; 45 46 typedef long vax_opcodeT; /* For initialising array of opcodes */ 47 /* Some synthetic opcodes > 16 bits! */ 48 49 #define VIT_OPCODE_SYNTHETIC 0x80000000 /* Not real hardware instruction. */ 50 #define VIT_OPCODE_SPECIAL 0x40000000 /* Not normal branch optimising. */ 51 /* Never set without ..._SYNTHETIC */ 52 53 #define VAX_WIDTH_UNCONDITIONAL_JUMP '-' /* These are encoded into */ 54 #define VAX_WIDTH_CONDITIONAL_JUMP '?' /* vop_width when vop_access=='b' */ 55 #define VAX_WIDTH_WORD_JUMP '!' /* and VIT_OPCODE_SYNTHETIC set. */ 56 #define VAX_WIDTH_BYTE_JUMP ':' /* */ 57 58 #define VAX_JSB (0x16) /* Jump to subroutine */ 59 #define VAX_JMP (0x17) /* Useful for branch optimising. Jump instr*/ 60 #define VAX_PC_RELATIVE_MODE (0xef) /* Use it after VAX_JMP */ 61 #define VAX_ABSOLUTE_MODE (0x9F)/* Use as @#... */ 62 #define VAX_BRB (0x11) /* Canonical branch. */ 63 #define VAX_BRW (0x31) /* Another canonical branch */ 64 #define VAX_CALLS (0xFB) /* Call with arg list on stack */ 65 #define VAX_CALLG (0xFA) /* Call with arg list in memory */ 66 #define VAX_WIDEN_WORD (0x20) /* Add this to byte branch to get word br. */ 67 #define VAX_WIDEN_LONG (0x6) /* Add this to byte branch to get long jmp.*/ 68 /* Needs VAX_PC_RELATIVE_MODE byte after it*/ 69 #define VAX_CALLS (0xFB) /* Call with arg list on stack */ 70 #define VAX_CALLG (0xFA) /* Call with arg list in memory */ 71 72 struct vit /* vax instruction tree */ 73 { 74 /* vit_opcode is char[] for portability. */ 75 char vit_opcode[sizeof (vax_opcodeT)]; 76 unsigned char vit_opcode_nbytes; /* How long is _opcode? (chars) */ 77 unsigned char vit_operands; /* */ 78 struct vop vit_operand[VIT_MAX_OPERANDS]; /* operands */ 79 const char *vit_error; /* "" or error text */ 80 }; 81 82 /* end of vax-inst.h */ 83