1 /* vax-inst.h - GNU - Part of vax.c
2 Copyright 1987, 1992, 1995, 2000, 2002 Free Software Foundation, Inc.
4 This file is part of GAS, the GNU Assembler.
6 GAS is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GAS is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GAS; see the file COPYING. If not, write to
18 the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
21 * This is part of vax-ins-parse.c & friends.
22 * We want to parse a vax instruction text into a tree defined here.
25 #define VIT_MAX_OPERANDS (6) /* maximum number of operands in one */
26 /* single vax instruction */
28 struct vop
/* vax instruction operand */
30 short int vop_ndx
; /* -1, or index register. eg 7=[R7] */
31 short int vop_reg
; /* -1, or register number. eg @I^#=0xF */
32 /* Helps distinguish "abs" from "abs(PC)". */
33 short int vop_mode
; /* addressing mode 4 bits. eg I^#=0x9 */
34 char vop_short
; /* operand displacement length as written */
35 /* ' '=none, "bilsw"=B^I^L^S^W^. */
36 char vop_access
; /* 'b'branch ' 'no-instruction 'amrvw'norm */
37 char vop_width
; /* Operand width, one of "bdfghloqw" */
38 const char *vop_warn
; /* warning message of this operand, if any */
39 const char *vop_error
; /* say if operand is inappropriate */
40 char *vop_expr_begin
; /* Unparsed expression, 1st char ... */
41 char *vop_expr_end
; /* ... last char. */
42 unsigned char vop_nbytes
; /* number of bytes in datum */
45 typedef long vax_opcodeT
; /* For initialising array of opcodes */
46 /* Some synthetic opcodes > 16 bits! */
48 #define VIT_OPCODE_SYNTHETIC 0x80000000 /* Not real hardware instruction. */
49 #define VIT_OPCODE_SPECIAL 0x40000000 /* Not normal branch optimising. */
50 /* Never set without ..._SYNTHETIC */
52 #define VAX_WIDTH_UNCONDITIONAL_JUMP '-' /* These are encoded into */
53 #define VAX_WIDTH_CONDITIONAL_JUMP '?' /* vop_width when vop_access=='b' */
54 #define VAX_WIDTH_WORD_JUMP '!' /* and VIT_OPCODE_SYNTHETIC set. */
55 #define VAX_WIDTH_BYTE_JUMP ':' /* */
57 #define VAX_JSB (0x16) /* Jump to subroutine */
58 #define VAX_JMP (0x17) /* Useful for branch optimising. Jump instr*/
59 #define VAX_PC_RELATIVE_MODE (0xef) /* Use it after VAX_JMP */
60 #define VAX_ABSOLUTE_MODE (0x9F)/* Use as @#... */
61 #define VAX_BRB (0x11) /* Canonical branch. */
62 #define VAX_BRW (0x31) /* Another canonical branch */
63 #define VAX_CALLS (0xFB) /* Call with arg list on stack */
64 #define VAX_CALLG (0xFA) /* Call with arg list in memory */
65 #define VAX_WIDEN_WORD (0x20) /* Add this to byte branch to get word br. */
66 #define VAX_WIDEN_LONG (0x6) /* Add this to byte branch to get long jmp.*/
67 /* Needs VAX_PC_RELATIVE_MODE byte after it*/
69 struct vit
/* vax instruction tree */
71 /* vit_opcode is char[] for portability. */
72 char vit_opcode
[sizeof (vax_opcodeT
)];
73 unsigned char vit_opcode_nbytes
; /* How long is _opcode? (chars) */
74 unsigned char vit_operands
; /* */
75 struct vop vit_operand
[VIT_MAX_OPERANDS
]; /* operands */
76 const char *vit_error
; /* "" or error text */
79 /* end of vax-inst.h */
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