| 1 | /* vax-inst.h - GNU - Part of vax.c
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| 2 | Copyright 1987, 1992, 1995, 2000 Free Software Foundation, Inc.
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| 3 |
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| 4 | This file is part of GAS, the GNU Assembler.
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| 5 |
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| 6 | GAS is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 2, or (at your option)
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| 9 | any later version.
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| 10 |
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| 11 | GAS is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with GAS; see the file COPYING. If not, write to
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| 18 | the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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| 19 |
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| 20 | /*
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| 21 | * This is part of vax-ins-parse.c & friends.
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| 22 | * We want to parse a vax instruction text into a tree defined here.
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| 23 | */
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| 24 |
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| 25 | #define VIT_MAX_OPERANDS (6) /* maximum number of operands in one */
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| 26 | /* single vax instruction */
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| 27 |
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| 28 | struct vop /* vax instruction operand */
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| 29 | {
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| 30 | short int vop_ndx; /* -1, or index register. eg 7=[R7] */
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| 31 | short int vop_reg; /* -1, or register number. eg @I^#=0xF */
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| 32 | /* Helps distinguish "abs" from "abs(PC)". */
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| 33 | short int vop_mode; /* addressing mode 4 bits. eg I^#=0x9 */
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| 34 | char vop_short; /* operand displacement length as written */
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| 35 | /* ' '=none, "bilsw"=B^I^L^S^W^. */
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| 36 | char vop_access; /* 'b'branch ' 'no-instruction 'amrvw'norm */
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| 37 | char vop_width; /* Operand width, one of "bdfghloqw" */
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| 38 | const char *vop_warn; /* warning message of this operand, if any */
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| 39 | const char *vop_error; /* say if operand is inappropriate */
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| 40 | char *vop_expr_begin; /* Unparsed expression, 1st char ... */
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| 41 | char *vop_expr_end; /* ... last char. */
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| 42 | unsigned char vop_nbytes; /* number of bytes in datum */
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| 43 | };
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| 44 |
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| 45 | typedef long vax_opcodeT; /* For initialising array of opcodes */
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| 46 | /* Some synthetic opcodes > 16 bits! */
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| 47 |
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| 48 | #define VIT_OPCODE_SYNTHETIC 0x80000000 /* Not real hardware instruction. */
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| 49 | #define VIT_OPCODE_SPECIAL 0x40000000 /* Not normal branch optimising. */
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| 50 | /* Never set without ..._SYNTHETIC */
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| 51 |
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| 52 | #define VAX_WIDTH_UNCONDITIONAL_JUMP '-' /* These are encoded into */
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| 53 | #define VAX_WIDTH_CONDITIONAL_JUMP '?' /* vop_width when vop_access=='b' */
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| 54 | #define VAX_WIDTH_WORD_JUMP '!' /* and VIT_OPCODE_SYNTHETIC set. */
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| 55 | #define VAX_WIDTH_BYTE_JUMP ':' /* */
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| 56 |
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| 57 | #define VAX_JSB (0x16) /* Jump to subroutine */
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| 58 | #define VAX_JMP (0x17) /* Useful for branch optimising. Jump instr*/
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| 59 | #define VAX_PC_RELATIVE_MODE (0xef) /* Use it after VAX_JMP */
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| 60 | #define VAX_ABSOLUTE_MODE (0x9F)/* Use as @#... */
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| 61 | #define VAX_BRB (0x11) /* Canonical branch. */
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| 62 | #define VAX_BRW (0x31) /* Another canonical branch */
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| 63 | #define VAX_CALLS (0xFB) /* Call with arg list on stack */
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| 64 | #define VAX_CALLG (0xFA) /* Call with arg list in memory */
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| 65 | #define VAX_WIDEN_WORD (0x20) /* Add this to byte branch to get word br. */
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| 66 | #define VAX_WIDEN_LONG (0x6) /* Add this to byte branch to get long jmp.*/
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| 67 | /* Needs VAX_PC_RELATIVE_MODE byte after it*/
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| 68 |
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| 69 | struct vit /* vax instruction tree */
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| 70 | {
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| 71 | /* vit_opcode is char[] for portability. */
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| 72 | char vit_opcode[sizeof (vax_opcodeT)];
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| 73 | unsigned char vit_opcode_nbytes; /* How long is _opcode? (chars) */
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| 74 | unsigned char vit_operands; /* */
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| 75 | struct vop vit_operand[VIT_MAX_OPERANDS]; /* operands */
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| 76 | const char *vit_error; /* "" or error text */
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| 77 | };
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| 78 |
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| 79 | /* end of vax-inst.h */
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