source: trunk/libs/newlib/src/include/opcode/tic80.h @ 482

Last change on this file since 482 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc

File size: 9.7 KB
Line 
1/* tic80.h -- Header file for TI TMS320C80 (MV) opcode table
2   Copyright 1996, 1997, 2003, 2010 Free Software Foundation, Inc.
3   Written by Fred Fish (fnf@cygnus.com), 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 3,
10   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 COPYING3.  If not, write to the Free
19   Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
20   MA 02110-1301, USA.  */
21
22#ifndef TIC80_H
23#define TIC80_H
24
25/* The opcode table is an array of struct tic80_opcode.  */
26
27struct tic80_opcode
28{
29  /* The opcode name.  */
30
31  const char *name;
32
33  /* The opcode itself.  Those bits which will be filled in with operands
34     are zeroes.  */
35
36  unsigned long opcode;
37
38  /* The opcode mask.  This is used by the disassembler.  This is a mask
39     containing ones indicating those bits which must match the opcode
40     field, and zeroes indicating those bits which need not match (and are
41     presumably filled in by operands).  */
42
43  unsigned long mask;
44
45  /* Special purpose flags for this opcode. */
46
47  unsigned char flags;
48
49  /* An array of operand codes.  Each code is an index into the operand
50     table.  They appear in the order which the operands must appear in
51     assembly code, and are terminated by a zero.  FIXME: Adjust size to
52     match actual requirements when TIc80 support is complete */
53
54  unsigned char operands[8];
55};
56
57/* The table itself is sorted by major opcode number, and is otherwise in
58   the order in which the disassembler should consider instructions.
59   FIXME: This isn't currently true. */
60
61extern const struct tic80_opcode tic80_opcodes[];
62extern const int tic80_num_opcodes;
63
64
65/* The operands table is an array of struct tic80_operand.  */
66
67struct tic80_operand
68{
69  /* The number of bits in the operand.  */
70
71  int bits;
72
73  /* How far the operand is left shifted in the instruction.  */
74
75  int shift;
76
77  /* Insertion function.  This is used by the assembler.  To insert an
78     operand value into an instruction, check this field.
79
80     If it is NULL, execute
81         i |= (op & ((1 << o->bits) - 1)) << o->shift;
82     (i is the instruction which we are filling in, o is a pointer to
83     this structure, and op is the opcode value; this assumes twos
84     complement arithmetic).
85
86     If this field is not NULL, then simply call it with the
87     instruction and the operand value.  It will return the new value
88     of the instruction.  If the ERRMSG argument is not NULL, then if
89     the operand value is illegal, *ERRMSG will be set to a warning
90     string (the operand will be inserted in any case).  If the
91     operand value is legal, *ERRMSG will be unchanged (most operands
92     can accept any value).  */
93
94  unsigned long (*insert)
95    (unsigned long instruction, long op, const char **errmsg);
96
97  /* Extraction function.  This is used by the disassembler.  To
98     extract this operand type from an instruction, check this field.
99
100     If it is NULL, compute
101         op = ((i) >> o->shift) & ((1 << o->bits) - 1);
102         if ((o->flags & TIC80_OPERAND_SIGNED) != 0
103             && (op & (1 << (o->bits - 1))) != 0)
104           op -= 1 << o->bits;
105     (i is the instruction, o is a pointer to this structure, and op
106     is the result; this assumes twos complement arithmetic).
107
108     If this field is not NULL, then simply call it with the
109     instruction value.  It will return the value of the operand.  If
110     the INVALID argument is not NULL, *INVALID will be set to
111     non-zero if this operand type can not actually be extracted from
112     this operand (i.e., the instruction does not match).  If the
113     operand is valid, *INVALID will not be changed.  */
114
115  long (*extract) (unsigned long instruction, int *invalid);
116
117  /* One bit syntax flags.  */
118
119  unsigned long flags;
120};
121
122/* Elements in the table are retrieved by indexing with values from
123   the operands field of the tic80_opcodes table.  */
124
125extern const struct tic80_operand tic80_operands[];
126
127
128/* Values defined for the flags field of a struct tic80_operand.
129
130   Note that flags for all predefined symbols, such as the general purpose
131   registers (ex: r10), control registers (ex: FPST), condition codes (ex:
132   eq0.b), bit numbers (ex: gt.b), etc are large enough that they can be
133   or'd into an int where the lower bits contain the actual numeric value
134   that correponds to this predefined symbol.  This way a single int can
135   contain both the value of the symbol and it's type.
136 */
137
138/* This operand must be an even register number.  Floating point numbers
139   for example are stored in even/odd register pairs. */
140
141#define TIC80_OPERAND_EVEN      (1 << 0)
142
143/* This operand must be an odd register number and must be one greater than
144   the register number of the previous operand.  I.E. the second register in
145   an even/odd register pair. */
146
147#define TIC80_OPERAND_ODD       (1 << 1)
148
149/* This operand takes signed values.  */
150
151#define TIC80_OPERAND_SIGNED    (1 << 2)
152
153/* This operand may be either a predefined constant name or a numeric value.
154   An example would be a condition code like "eq0.b" which has the numeric
155   value 0x2. */
156
157#define TIC80_OPERAND_NUM       (1 << 3)
158
159/* This operand should be wrapped in parentheses rather than separated
160   from the previous one by a comma.  This is used for various
161   instructions, like the load and store instructions, which want
162   their operands to look like "displacement(reg)" */
163
164#define TIC80_OPERAND_PARENS    (1 << 4)
165
166/* This operand is a PC relative branch offset.  The disassembler prints
167   these symbolically if possible.  Note that the offsets are taken as word
168   offsets. */
169
170#define TIC80_OPERAND_PCREL     (1 << 5)
171
172/* This flag is a hint to the disassembler for using hex as the prefered
173   printing format, even for small positive or negative immediate values.
174   Normally values in the range -999 to 999 are printed as signed decimal
175   values and other values are printed in hex. */
176
177#define TIC80_OPERAND_BITFIELD  (1 << 6)
178
179/* This operand may have a ":m" modifier specified by bit 17 in a short
180   immediate form instruction. */
181
182#define TIC80_OPERAND_M_SI      (1 << 7)
183
184/* This operand may have a ":m" modifier specified by bit 15 in a long
185   immediate or register form instruction. */
186
187#define TIC80_OPERAND_M_LI      (1 << 8)
188
189/* This operand may have a ":s" modifier specified in bit 11 in a long
190   immediate or register form instruction. */
191
192#define TIC80_OPERAND_SCALED    (1 << 9)
193
194/* This operand is a floating point value */
195
196#define TIC80_OPERAND_FLOAT     (1 << 10)
197
198/* This operand is an byte offset from a base relocation. The lower
199 two bits of the final relocated address are ignored when the value is
200 written to the program counter. */
201
202#define TIC80_OPERAND_BASEREL   (1 << 11)
203
204/* This operand is an "endmask" field for a shift instruction.
205   It is treated special in that it can have values of 0-32,
206   where 0 and 32 result in the same instruction.  The assembler
207   must be able to accept both endmask values.  This disassembler
208   has no way of knowing from the instruction which value was
209   given at assembly time, so it just uses '0'. */
210
211#define TIC80_OPERAND_ENDMASK   (1 << 12)
212
213/* This operand is one of the 32 general purpose registers.
214   The disassembler prints these with a leading 'r'. */
215
216#define TIC80_OPERAND_GPR       (1 << 27)
217
218/* This operand is a floating point accumulator register.
219   The disassembler prints these with a leading 'a'. */
220
221#define TIC80_OPERAND_FPA       ( 1 << 28)
222
223/* This operand is a control register number, either numeric or
224   symbolic (like "EIF", "EPC", etc).
225   The disassembler prints these symbolically. */
226
227#define TIC80_OPERAND_CR        (1 << 29)
228
229/* This operand is a condition code, either numeric or
230   symbolic (like "eq0.b", "ne0.w", etc).
231   The disassembler prints these symbolically. */
232
233#define TIC80_OPERAND_CC        (1 << 30)
234
235/* This operand is a bit number, either numeric or
236   symbolic (like "eq.b", "or.f", etc).
237   The disassembler prints these symbolically.
238   Note that they appear in the instruction in 1's complement relative
239   to the values given in the manual. */
240
241#define TIC80_OPERAND_BITNUM    (1 << 31)
242
243/* This mask is used to strip operand bits from an int that contains
244   both operand bits and a numeric value in the lsbs. */
245
246#define TIC80_OPERAND_MASK      (TIC80_OPERAND_GPR | TIC80_OPERAND_FPA | TIC80_OPERAND_CR | TIC80_OPERAND_CC | TIC80_OPERAND_BITNUM)
247
248
249/* Flag bits for the struct tic80_opcode flags field. */
250
251#define TIC80_VECTOR            01      /* Is a vector instruction */
252#define TIC80_NO_R0_DEST        02      /* Register r0 cannot be a destination register */
253
254
255/* The opcodes library contains a table that allows translation from predefined
256   symbol names to numeric values, and vice versa. */
257
258/* Structure to hold information about predefined symbols.  */
259
260struct predefined_symbol
261{
262  char *name;           /* name to recognize */
263  int value;
264};
265
266#define PDS_NAME(pdsp) ((pdsp) -> name)
267#define PDS_VALUE(pdsp) ((pdsp) -> value)
268
269/* Translation array.  */
270extern const struct predefined_symbol tic80_predefined_symbols[];
271/* How many members in the array.  */
272extern const int tic80_num_predefined_symbols;
273
274/* Translate value to symbolic name.  */
275const char *tic80_value_to_symbol (int val, int class);
276
277/* Translate symbolic name to value.  */
278int tic80_symbol_to_value (char *name, int class);
279
280const struct predefined_symbol *tic80_next_predefined_symbol
281  (const struct predefined_symbol *);
282
283#endif /* TIC80_H */
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