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      1 /*	$NetBSD: db_disasm.h,v 1.8 2017/05/22 16:39:41 ragge Exp $ */
      2 /*
      3  * Copyright (c) 1996 Ludd, University of Lule}, Sweden.
      4  * All rights reserved.
      5  *
      6  * This code is derived from software contributed to Ludd by
      7  * Bertram Barth.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 
     31 
     32 #define SIZE_BYTE	 1		/* Byte */
     33 #define SIZE_WORD	 2		/* Word */
     34 #define SIZE_LONG 	 4		/* Longword */
     35 #define SIZE_QWORD	 8		/* Quadword */
     36 #define SIZE_OWORD	16		/* Octaword */
     37 
     38 /*
     39  * The VAX instruction set has a variable length instruction format which
     40  * may be as short as one byte and as long as needed depending on the type
     41  * of instruction. [...] Each instruction consists of an opcode followed
     42  * by zero to six operand specifiers whose number and type depend on the
     43  * opcode. All operand specidiers are, themselves, of the same format --
     44  * i.e. an address mode plus additional information.
     45  *
     46  * [VAX Architecture Handbook, p.52:  Instruction Format]
     47  */
     48 
     49 typedef const struct {
     50 	const char *mnemonic;
     51 	const char *argdesc;
     52 } vax_instr_t;
     53 
     54 extern vax_instr_t vax_inst[256];
     55 extern vax_instr_t vax_inst2[0x56];
     56 
     57 long skip_opcode(long);
     58 
     59 /*
     60  * reasonably simple macro to gather all the reserved two-byte opcodes
     61  * into only a few table entries...
     62  */
     63 #define	INDEX_OPCODE(x)	\
     64 	(((x) & 0xff00) == 0xfe00) ? 0 : \
     65 	((x) < 0xfd30) ? 0 : \
     66 	((x) < 0xfd80) ? (x) - 0xfd30 : \
     67 	((x) == 0xfd98) ? 0x50 : \
     68 	((x) == 0xfd99) ? 0x51 : \
     69 	((x) == 0xfdf6) ? 0x52 : \
     70 	((x) == 0xfdf7) ? 0x53 : \
     71 	((x) == 0xfffd) ? 0x54 : \
     72 	((x) == 0xfffe) ? 0x55 : 0
     73