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1 | /* vax-inst.h - GNU - Part of vax.c |
2 | Copyright (C) 1987 Free Software Foundation, Inc. |
3 | |
4 | This file is part of GAS, the GNU Assembler. |
5 | |
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 1, or (at your option) |
9 | any later version. |
10 | |
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. |
15 | |
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, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
19 | |
20 | /* |
21 | * This is part of vax-ins-parse.c & friends. |
22 | * We want to parse a vax instruction text into a tree defined here. |
23 | */ |
24 | |
25 | #define VIT_MAX_OPERANDS (6) /* maximum number of operands in one */ |
26 | /* single vax instruction */ |
27 | |
28 | struct vop /* vax instruction operand */ |
29 | { |
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 | char * vop_warn; /* warning message of this operand, if any */ |
39 | 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 */ |
43 | }; |
44 | |
45 | |
46 | typedef long vax_opcodeT; /* For initialising array of opcodes */ |
47 | /* Some synthetic opcodes > 16 bits! */ |
48 | |
49 | #define VIT_OPCODE_SYNTHETIC 0x80000000 /* Not real hardware instruction. */ |
50 | #define VIT_OPCODE_SPECIAL 0x40000000 /* Not normal branch optimising. */ |
51 | /* Never set without ..._SYNTHETIC */ |
52 | |
53 | #define VAX_WIDTH_UNCONDITIONAL_JUMP '-' /* These are encoded into */ |
54 | #define VAX_WIDTH_CONDITIONAL_JUMP '?' /* vop_width when vop_access=='b' */ |
55 | #define VAX_WIDTH_WORD_JUMP '!' /* and VIT_OPCODE_SYNTHETIC set. */ |
56 | #define VAX_WIDTH_BYTE_JUMP ':' /* */ |
57 | |
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_WIDEN_WORD (0x20) /* Add this to byte branch to get word br. */ |
64 | #define VAX_WIDEN_LONG (0x6) /* Add this to byte branch to get long jmp.*/ |
65 | /* Needs VAX_PC_RELATIVE_MODE byte after it*/ |
66 | |
67 | struct vit /* vax instruction tree */ |
68 | { |
69 | /* vit_opcode is char[] for portability. */ |
70 | char vit_opcode [ sizeof (vax_opcodeT) ]; |
71 | unsigned char vit_opcode_nbytes; /* How long is _opcode? (chars) */ |
72 | unsigned char vit_operands;/* */ |
73 | struct vop vit_operand[VIT_MAX_OPERANDS]; /* operands */ |
74 | char * vit_error; /* "" or error text */ |
75 | }; |
76 | |
77 | /* end: vax-inst.h */ |