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