| 1 | /* vax-inst.h - GNU - Part of vax.c |
| 2 | Copyright (C) 1987-2020 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 */ |