mirror of
https://github.com/autc04/Retro68.git
synced 2024-08-31 09:29:37 +00:00
80 lines
3.6 KiB
C
80 lines
3.6 KiB
C
/* vax-inst.h - GNU - Part of vax.c
|
|
Copyright (C) 1987-2017 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 3, 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, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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" */
|
|
const char *vop_warn; /* warning message of this operand, if any */
|
|
const 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_JSB (0x16) /* Jump to subroutine */
|
|
#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_CALLS (0xFB) /* Call with arg list on stack */
|
|
#define VAX_CALLG (0xFA) /* Call with arg list in memory */
|
|
#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 */
|
|
const char *vit_error; /* "" or error text */
|
|
};
|
|
|
|
/* end of vax-inst.h */
|