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7a3c9336 C |
1 | /* v850.h -- Header file for NEC V850 opcode table |
2 | Copyright 1996 Free Software Foundation, Inc. | |
3 | Written by J.T. Conklin, Cygnus Support | |
4 | ||
5 | This file is part of GDB, GAS, and the GNU binutils. | |
6 | ||
7 | GDB, GAS, and the GNU binutils are free software; you can redistribute | |
8 | them and/or modify them under the terms of the GNU General Public | |
9 | License as published by the Free Software Foundation; either version | |
10 | 1, or (at your option) any later version. | |
11 | ||
12 | GDB, GAS, and the GNU binutils are distributed in the hope that they | |
13 | will be useful, but WITHOUT ANY WARRANTY; without even the implied | |
14 | warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
15 | the GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this file; see the file COPYING. If not, write to the Free | |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #ifndef V850_H | |
22 | #define V850_H | |
23 | ||
24 | /* The opcode table is an array of struct v850_opcode. */ | |
25 | ||
26 | struct v850_opcode | |
27 | { | |
28 | /* The opcode name. */ | |
29 | const char *name; | |
30 | ||
31 | /* The opcode itself. Those bits which will be filled in with | |
32 | operands are zeroes. */ | |
33 | unsigned long opcode; | |
34 | ||
35 | /* The opcode mask. This is used by the disassembler. This is a | |
36 | mask containing ones indicating those bits which must match the | |
37 | opcode field, and zeroes indicating those bits which need not | |
38 | match (and are presumably filled in by operands). */ | |
39 | unsigned long mask; | |
40 | ||
41 | /* An array of operand codes. Each code is an index into the | |
42 | operand table. They appear in the order which the operands must | |
43 | appear in assembly code, and are terminated by a zero. */ | |
44 | unsigned char operands[8]; | |
7e3670d6 FF |
45 | |
46 | /* Which (if any) operand is a memory operand. */ | |
47 | unsigned int memop; | |
7a3c9336 C |
48 | }; |
49 | ||
50 | /* The table itself is sorted by major opcode number, and is otherwise | |
51 | in the order in which the disassembler should consider | |
52 | instructions. */ | |
53 | extern const struct v850_opcode v850_opcodes[]; | |
54 | extern const int v850_num_opcodes; | |
55 | ||
56 | \f | |
7e3670d6 | 57 | /* The operands table is an array of struct v850_operand. */ |
7a3c9336 C |
58 | |
59 | struct v850_operand | |
60 | { | |
61 | /* The number of bits in the operand. */ | |
62 | int bits; | |
63 | ||
64 | /* How far the operand is left shifted in the instruction. */ | |
65 | int shift; | |
dd528aff | 66 | |
27021dd4 C |
67 | /* Insertion function. This is used by the assembler. To insert an |
68 | operand value into an instruction, check this field. | |
69 | ||
70 | If it is NULL, execute | |
71 | i |= (op & ((1 << o->bits) - 1)) << o->shift; | |
72 | (i is the instruction which we are filling in, o is a pointer to | |
73 | this structure, and op is the opcode value; this assumes twos | |
74 | complement arithmetic). | |
75 | ||
76 | If this field is not NULL, then simply call it with the | |
77 | instruction and the operand value. It will return the new value | |
78 | of the instruction. If the ERRMSG argument is not NULL, then if | |
79 | the operand value is illegal, *ERRMSG will be set to a warning | |
80 | string (the operand will be inserted in any case). If the | |
81 | operand value is legal, *ERRMSG will be unchanged (most operands | |
82 | can accept any value). */ | |
83 | unsigned long (*insert) PARAMS ((unsigned long instruction, long op, | |
84 | const char **errmsg)); | |
85 | ||
86 | /* Extraction function. This is used by the disassembler. To | |
87 | extract this operand type from an instruction, check this field. | |
88 | ||
89 | If it is NULL, compute | |
90 | op = ((i) >> o->shift) & ((1 << o->bits) - 1); | |
91 | if ((o->flags & PPC_OPERAND_SIGNED) != 0 | |
92 | && (op & (1 << (o->bits - 1))) != 0) | |
93 | op -= 1 << o->bits; | |
94 | (i is the instruction, o is a pointer to this structure, and op | |
95 | is the result; this assumes twos complement arithmetic). | |
96 | ||
97 | If this field is not NULL, then simply call it with the | |
98 | instruction value. It will return the value of the operand. If | |
99 | the INVALID argument is not NULL, *INVALID will be set to | |
100 | non-zero if this operand type can not actually be extracted from | |
101 | this operand (i.e., the instruction does not match). If the | |
102 | operand is valid, *INVALID will not be changed. */ | |
103 | long (*extract) PARAMS ((unsigned long instruction, int *invalid)); | |
104 | ||
105 | /* One bit syntax flags. */ | |
dd528aff | 106 | int flags; |
7a3c9336 C |
107 | }; |
108 | ||
109 | /* Elements in the table are retrieved by indexing with values from | |
110 | the operands field of the v850_opcodes table. */ | |
111 | ||
112 | extern const struct v850_operand v850_operands[]; | |
113 | ||
dd528aff | 114 | /* Values defined for the flags field of a struct v850_operand. */ |
dd528aff | 115 | |
27021dd4 C |
116 | /* This operand names a general purpose register */ |
117 | #define V850_OPERAND_REG 0x01 | |
dd528aff | 118 | |
27021dd4 C |
119 | /* This operand names a system register */ |
120 | #define V850_OPERAND_SRG 0x02 | |
121 | ||
122 | /* This operand names a condition code used in the setf instruction */ | |
123 | #define V850_OPERAND_CC 0x04 | |
124 | ||
125 | /* This operand takes signed values */ | |
126 | #define V850_OPERAND_SIGNED 0x08 | |
7a3c9336 | 127 | |
7e3670d6 FF |
128 | /* This operand is the ep register. */ |
129 | #define V850_OPERAND_EP 0x10 | |
130 | ||
131 | /* This operand is a PC displacement */ | |
132 | #define V850_OPERAND_DISP 0x20 | |
133 | ||
134 | /* This is a relaxable operand. Only used for D9->D22 branch relaxing | |
135 | right now. We may need others in the future (or maybe handle them like | |
136 | promoted operands on the mn10300?) */ | |
137 | #define V850_OPERAND_RELAX 0x40 | |
138 | ||
7a3c9336 | 139 | #endif /* V850_H */ |