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/* vax-inst.h - GNU - Part of vax.c
Copyright (C) 1987, 1992 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/*
* This is part of vax-ins-parse.c & friends.
* We want to parse a vax instruction text into a tree defined here.
*/
#define VIT_MAX_OPERANDS (6) /* maximum number of operands in one */
/* single vax instruction */
struct vop /* vax instruction operand */
{
short int vop_ndx; /* -1, or index register. eg 7=[R7] */
short int vop_reg; /* -1, or register number. eg @I^#=0xF */
/* Helps distinguish "abs" from "abs(PC)". */
short int vop_mode; /* addressing mode 4 bits. eg I^#=0x9 */
char vop_short; /* operand displacement length as written */
/* ' '=none, "bilsw"=B^I^L^S^W^. */
char vop_access; /* 'b'branch ' 'no-instruction 'amrvw'norm */
char vop_width; /* Operand width, one of "bdfghloqw" */
char *vop_warn; /* warning message of this operand, if any */
char *vop_error; /* say if operand is inappropriate */
char *vop_expr_begin; /* Unparsed expression, 1st char ... */
char *vop_expr_end; /* ... last char. */
unsigned char vop_nbytes; /* number of bytes in datum */
};
typedef long vax_opcodeT; /* For initialising array of opcodes */
/* Some synthetic opcodes > 16 bits! */
#define VIT_OPCODE_SYNTHETIC 0x80000000 /* Not real hardware instruction. */
#define VIT_OPCODE_SPECIAL 0x40000000 /* Not normal branch optimising. */
/* Never set without ..._SYNTHETIC */
#define VAX_WIDTH_UNCONDITIONAL_JUMP '-' /* These are encoded into */
#define VAX_WIDTH_CONDITIONAL_JUMP '?' /* vop_width when vop_access == 'b' */
#define VAX_WIDTH_WORD_JUMP '!' /* and VIT_OPCODE_SYNTHETIC set. */
#define VAX_WIDTH_BYTE_JUMP ':' /* */
#define VAX_JMP (0x17) /* Useful for branch optimising. Jump instr*/
#define VAX_PC_RELATIVE_MODE (0xef) /* Use it after VAX_JMP */
#define VAX_ABSOLUTE_MODE (0x9F) /* Use as @#... */
#define VAX_BRB (0x11) /* Canonical branch. */
#define VAX_BRW (0x31) /* Another canonical branch */
#define VAX_WIDEN_WORD (0x20) /* Add this to byte branch to get word br. */
#define VAX_WIDEN_LONG (0x6) /* Add this to byte branch to get long jmp.*/
/* Needs VAX_PC_RELATIVE_MODE byte after it*/
struct vit /* vax instruction tree */
{
/* vit_opcode is char[] for portability. */
char vit_opcode[ sizeof (vax_opcodeT) ];
unsigned char vit_opcode_nbytes; /* How long is _opcode? (chars) */
unsigned char vit_operands;/* */
struct vop vit_operand[VIT_MAX_OPERANDS]; /* operands */
char * vit_error; /* "" or error text */
};
/* end of vax-inst.h */
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