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1/*
2 NetWinder Floating Point Emulator
3 (c) Rebel.COM, 1998,1999
4
5 Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 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 program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20*/
21
22#ifndef __FPOPCODE_H__
23#define __FPOPCODE_H__
24
25/*
26ARM Floating Point Instruction Classes
27| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
28|c o n d|1 1 0 P|U|u|W|L| Rn |v| Fd |0|0|0|1| o f f s e t | CPDT
29|c o n d|1 1 0 P|U|w|W|L| Rn |x| Fd |0|0|0|1| o f f s e t | CPDT
30| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
31|c o n d|1 1 1 0|a|b|c|d|e| Fn |j| Fd |0|0|0|1|f|g|h|0|i| Fm | CPDO
32|c o n d|1 1 1 0|a|b|c|L|e| Fn | Rd |0|0|0|1|f|g|h|1|i| Fm | CPRT
33|c o n d|1 1 1 0|a|b|c|1|e| Fn |1|1|1|1|0|0|0|1|f|g|h|1|i| Fm | comparisons
34| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
35
36CPDT data transfer instructions
37 LDF, STF, LFM, SFM
38
39CPDO dyadic arithmetic instructions
40 ADF, MUF, SUF, RSF, DVF, RDF,
41 POW, RPW, RMF, FML, FDV, FRD, POL
42
43CPDO monadic arithmetic instructions
44 MVF, MNF, ABS, RND, SQT, LOG, LGN, EXP,
45 SIN, COS, TAN, ASN, ACS, ATN, URD, NRM
46
47CPRT joint arithmetic/data transfer instructions
48 FIX (arithmetic followed by load/store)
49 FLT (load/store followed by arithmetic)
50 CMF, CNF CMFE, CNFE (comparisons)
51 WFS, RFS (write/read floating point status register)
52 WFC, RFC (write/read floating point control register)
53
54cond condition codes
55P pre/post index bit: 0 = postindex, 1 = preindex
56U up/down bit: 0 = stack grows down, 1 = stack grows up
57W write back bit: 1 = update base register (Rn)
58L load/store bit: 0 = store, 1 = load
59Rn base register
60Rd destination/source register
61Fd floating point destination register
62Fn floating point source register
63Fm floating point source register or floating point constant
64
65uv transfer length (TABLE 1)
66wx register count (TABLE 2)
67abcd arithmetic opcode (TABLES 3 & 4)
68ef destination size (rounding precision) (TABLE 5)
69gh rounding mode (TABLE 6)
70j dyadic/monadic bit: 0 = dyadic, 1 = monadic
71i constant bit: 1 = constant (TABLE 6)
72*/
73
74/*
75TABLE 1
76+-------------------------+---+---+---------+---------+
77| Precision | u | v | FPSR.EP | length |
78+-------------------------+---+---+---------+---------+
79| Single | 0 ü 0 | x | 1 words |
80| Double | 1 ü 1 | x | 2 words |
81| Extended | 1 ü 1 | x | 3 words |
82| Packed decimal | 1 ü 1 | 0 | 3 words |
83| Expanded packed decimal | 1 ü 1 | 1 | 4 words |
84+-------------------------+---+---+---------+---------+
85Note: x = don't care
86*/
87
88/*
89TABLE 2
90+---+---+---------------------------------+
91| w | x | Number of registers to transfer |
92+---+---+---------------------------------+
93| 0 ü 1 | 1 |
94| 1 ü 0 | 2 |
95| 1 ü 1 | 3 |
96| 0 ü 0 | 4 |
97+---+---+---------------------------------+
98*/
99
100/*
101TABLE 3: Dyadic Floating Point Opcodes
102+---+---+---+---+----------+-----------------------+-----------------------+
103| a | b | c | d | Mnemonic | Description | Operation |
104+---+---+---+---+----------+-----------------------+-----------------------+
105| 0 | 0 | 0 | 0 | ADF | Add | Fd := Fn + Fm |
106| 0 | 0 | 0 | 1 | MUF | Multiply | Fd := Fn * Fm |
107| 0 | 0 | 1 | 0 | SUF | Subtract | Fd := Fn - Fm |
108| 0 | 0 | 1 | 1 | RSF | Reverse subtract | Fd := Fm - Fn |
109| 0 | 1 | 0 | 0 | DVF | Divide | Fd := Fn / Fm |
110| 0 | 1 | 0 | 1 | RDF | Reverse divide | Fd := Fm / Fn |
111| 0 | 1 | 1 | 0 | POW | Power | Fd := Fn ^ Fm |
112| 0 | 1 | 1 | 1 | RPW | Reverse power | Fd := Fm ^ Fn |
113| 1 | 0 | 0 | 0 | RMF | Remainder | Fd := IEEE rem(Fn/Fm) |
114| 1 | 0 | 0 | 1 | FML | Fast Multiply | Fd := Fn * Fm |
115| 1 | 0 | 1 | 0 | FDV | Fast Divide | Fd := Fn / Fm |
116| 1 | 0 | 1 | 1 | FRD | Fast reverse divide | Fd := Fm / Fn |
117| 1 | 1 | 0 | 0 | POL | Polar angle (ArcTan2) | Fd := arctan2(Fn,Fm) |
118| 1 | 1 | 0 | 1 | | undefined instruction | trap |
119| 1 | 1 | 1 | 0 | | undefined instruction | trap |
120| 1 | 1 | 1 | 1 | | undefined instruction | trap |
121+---+---+---+---+----------+-----------------------+-----------------------+
122Note: POW, RPW, POL are deprecated, and are available for backwards
123 compatibility only.
124*/
125
126/*
127TABLE 4: Monadic Floating Point Opcodes
128+---+---+---+---+----------+-----------------------+-----------------------+
129| a | b | c | d | Mnemonic | Description | Operation |
130+---+---+---+---+----------+-----------------------+-----------------------+
131| 0 | 0 | 0 | 0 | MVF | Move | Fd := Fm |
132| 0 | 0 | 0 | 1 | MNF | Move negated | Fd := - Fm |
133| 0 | 0 | 1 | 0 | ABS | Absolute value | Fd := abs(Fm) |
134| 0 | 0 | 1 | 1 | RND | Round to integer | Fd := int(Fm) |
135| 0 | 1 | 0 | 0 | SQT | Square root | Fd := sqrt(Fm) |
136| 0 | 1 | 0 | 1 | LOG | Log base 10 | Fd := log10(Fm) |
137| 0 | 1 | 1 | 0 | LGN | Log base e | Fd := ln(Fm) |
138| 0 | 1 | 1 | 1 | EXP | Exponent | Fd := e ^ Fm |
139| 1 | 0 | 0 | 0 | SIN | Sine | Fd := sin(Fm) |
140| 1 | 0 | 0 | 1 | COS | Cosine | Fd := cos(Fm) |
141| 1 | 0 | 1 | 0 | TAN | Tangent | Fd := tan(Fm) |
142| 1 | 0 | 1 | 1 | ASN | Arc Sine | Fd := arcsin(Fm) |
143| 1 | 1 | 0 | 0 | ACS | Arc Cosine | Fd := arccos(Fm) |
144| 1 | 1 | 0 | 1 | ATN | Arc Tangent | Fd := arctan(Fm) |
145| 1 | 1 | 1 | 0 | URD | Unnormalized round | Fd := int(Fm) |
146| 1 | 1 | 1 | 1 | NRM | Normalize | Fd := norm(Fm) |
147+---+---+---+---+----------+-----------------------+-----------------------+
148Note: LOG, LGN, EXP, SIN, COS, TAN, ASN, ACS, ATN are deprecated, and are
149 available for backwards compatibility only.
150*/
151
152/*
153TABLE 5
154+-------------------------+---+---+
155| Rounding Precision | e | f |
156+-------------------------+---+---+
157| IEEE Single precision | 0 ü 0 |
158| IEEE Double precision | 0 ü 1 |
159| IEEE Extended precision | 1 ü 0 |
160| undefined (trap) | 1 ü 1 |
161+-------------------------+---+---+
162*/
163
164/*
165TABLE 5
166+---------------------------------+---+---+
167| Rounding Mode | g | h |
168+---------------------------------+---+---+
169| Round to nearest (default) | 0 ü 0 |
170| Round toward plus infinity | 0 ü 1 |
171| Round toward negative infinity | 1 ü 0 |
172| Round toward zero | 1 ü 1 |
173+---------------------------------+---+---+
174*/
175
176/*
177===
178=== Definitions for load and store instructions
179===
180*/
181
182/* bit masks */
183#define BIT_PREINDEX 0x01000000
184#define BIT_UP 0x00800000
185#define BIT_WRITE_BACK 0x00200000
186#define BIT_LOAD 0x00100000
187
188/* masks for load/store */
189#define MASK_CPDT 0x0c000000 /* data processing opcode */
190#define MASK_OFFSET 0x000000ff
191#define MASK_TRANSFER_LENGTH 0x00408000
192#define MASK_REGISTER_COUNT MASK_TRANSFER_LENGTH
193#define MASK_COPROCESSOR 0x00000f00
194
195/* Tests for transfer length */
196#define TRANSFER_SINGLE 0x00000000
197#define TRANSFER_DOUBLE 0x00008000
198#define TRANSFER_EXTENDED 0x00400000
199#define TRANSFER_PACKED MASK_TRANSFER_LENGTH
200
201/* Get the coprocessor number from the opcode. */
202#define getCoprocessorNumber(opcode) ((opcode & MASK_COPROCESSOR) >> 8)
203
204/* Get the offset from the opcode. */
205#define getOffset(opcode) (opcode & MASK_OFFSET)
206
207/* Tests for specific data transfer load/store opcodes. */
208#define TEST_OPCODE(opcode,mask) (((opcode) & (mask)) == (mask))
209
210#define LOAD_OP(opcode) TEST_OPCODE((opcode),MASK_CPDT | BIT_LOAD)
211#define STORE_OP(opcode) ((opcode & (MASK_CPDT | BIT_LOAD)) == MASK_CPDT)
212
213#define LDF_OP(opcode) (LOAD_OP(opcode) && (getCoprocessorNumber(opcode) == 1))
214#define LFM_OP(opcode) (LOAD_OP(opcode) && (getCoprocessorNumber(opcode) == 2))
215#define STF_OP(opcode) (STORE_OP(opcode) && (getCoprocessorNumber(opcode) == 1))
216#define SFM_OP(opcode) (STORE_OP(opcode) && (getCoprocessorNumber(opcode) == 2))
217
218#define PREINDEXED(opcode) ((opcode & BIT_PREINDEX) != 0)
219#define POSTINDEXED(opcode) ((opcode & BIT_PREINDEX) == 0)
220#define BIT_UP_SET(opcode) ((opcode & BIT_UP) != 0)
221#define BIT_UP_CLEAR(opcode) ((opcode & BIT_DOWN) == 0)
222#define WRITE_BACK(opcode) ((opcode & BIT_WRITE_BACK) != 0)
223#define LOAD(opcode) ((opcode & BIT_LOAD) != 0)
224#define STORE(opcode) ((opcode & BIT_LOAD) == 0)
225
226/*
227===
228=== Definitions for arithmetic instructions
229===
230*/
231/* bit masks */
232#define BIT_MONADIC 0x00008000
233#define BIT_CONSTANT 0x00000008
234
235#define CONSTANT_FM(opcode) ((opcode & BIT_CONSTANT) != 0)
236#define MONADIC_INSTRUCTION(opcode) ((opcode & BIT_MONADIC) != 0)
237
238/* instruction identification masks */
239#define MASK_CPDO 0x0e000000 /* arithmetic opcode */
240#define MASK_ARITHMETIC_OPCODE 0x00f08000
241#define MASK_DESTINATION_SIZE 0x00080080
242
243/* dyadic arithmetic opcodes. */
244#define ADF_CODE 0x00000000
245#define MUF_CODE 0x00100000
246#define SUF_CODE 0x00200000
247#define RSF_CODE 0x00300000
248#define DVF_CODE 0x00400000
249#define RDF_CODE 0x00500000
250#define POW_CODE 0x00600000
251#define RPW_CODE 0x00700000
252#define RMF_CODE 0x00800000
253#define FML_CODE 0x00900000
254#define FDV_CODE 0x00a00000
255#define FRD_CODE 0x00b00000
256#define POL_CODE 0x00c00000
257/* 0x00d00000 is an invalid dyadic arithmetic opcode */
258/* 0x00e00000 is an invalid dyadic arithmetic opcode */
259/* 0x00f00000 is an invalid dyadic arithmetic opcode */
260
261/* monadic arithmetic opcodes. */
262#define MVF_CODE 0x00008000
263#define MNF_CODE 0x00108000
264#define ABS_CODE 0x00208000
265#define RND_CODE 0x00308000
266#define SQT_CODE 0x00408000
267#define LOG_CODE 0x00508000
268#define LGN_CODE 0x00608000
269#define EXP_CODE 0x00708000
270#define SIN_CODE 0x00808000
271#define COS_CODE 0x00908000
272#define TAN_CODE 0x00a08000
273#define ASN_CODE 0x00b08000
274#define ACS_CODE 0x00c08000
275#define ATN_CODE 0x00d08000
276#define URD_CODE 0x00e08000
277#define NRM_CODE 0x00f08000
278
279/*
280===
281=== Definitions for register transfer and comparison instructions
282===
283*/
284
285#define MASK_CPRT 0x0e000010 /* register transfer opcode */
286#define MASK_CPRT_CODE 0x00f00000
287#define FLT_CODE 0x00000000
288#define FIX_CODE 0x00100000
289#define WFS_CODE 0x00200000
290#define RFS_CODE 0x00300000
291#define WFC_CODE 0x00400000
292#define RFC_CODE 0x00500000
293#define CMF_CODE 0x00900000
294#define CNF_CODE 0x00b00000
295#define CMFE_CODE 0x00d00000
296#define CNFE_CODE 0x00f00000
297
298/*
299===
300=== Common definitions
301===
302*/
303
304/* register masks */
305#define MASK_Rd 0x0000f000
306#define MASK_Rn 0x000f0000
307#define MASK_Fd 0x00007000
308#define MASK_Fm 0x00000007
309#define MASK_Fn 0x00070000
310
311/* condition code masks */
312#define CC_MASK 0xf0000000
313#define CC_NEGATIVE 0x80000000
314#define CC_ZERO 0x40000000
315#define CC_CARRY 0x20000000
316#define CC_OVERFLOW 0x10000000
317#define CC_EQ 0x00000000
318#define CC_NE 0x10000000
319#define CC_CS 0x20000000
320#define CC_HS CC_CS
321#define CC_CC 0x30000000
322#define CC_LO CC_CC
323#define CC_MI 0x40000000
324#define CC_PL 0x50000000
325#define CC_VS 0x60000000
326#define CC_VC 0x70000000
327#define CC_HI 0x80000000
328#define CC_LS 0x90000000
329#define CC_GE 0xa0000000
330#define CC_LT 0xb0000000
331#define CC_GT 0xc0000000
332#define CC_LE 0xd0000000
333#define CC_AL 0xe0000000
334#define CC_NV 0xf0000000
335
336/* rounding masks/values */
337#define MASK_ROUNDING_MODE 0x00000060
338#define ROUND_TO_NEAREST 0x00000000
339#define ROUND_TO_PLUS_INFINITY 0x00000020
340#define ROUND_TO_MINUS_INFINITY 0x00000040
341#define ROUND_TO_ZERO 0x00000060
342
343#define MASK_ROUNDING_PRECISION 0x00080080
344#define ROUND_SINGLE 0x00000000
345#define ROUND_DOUBLE 0x00000080
346#define ROUND_EXTENDED 0x00080000
347
348/* Get the condition code from the opcode. */
349#define getCondition(opcode) (opcode >> 28)
350
351/* Get the source register from the opcode. */
352#define getRn(opcode) ((opcode & MASK_Rn) >> 16)
353
354/* Get the destination floating point register from the opcode. */
355#define getFd(opcode) ((opcode & MASK_Fd) >> 12)
356
357/* Get the first source floating point register from the opcode. */
358#define getFn(opcode) ((opcode & MASK_Fn) >> 16)
359
360/* Get the second source floating point register from the opcode. */
361#define getFm(opcode) (opcode & MASK_Fm)
362
363/* Get the destination register from the opcode. */
364#define getRd(opcode) ((opcode & MASK_Rd) >> 12)
365
366/* Get the rounding mode from the opcode. */
367#define getRoundingMode(opcode) ((opcode & MASK_ROUNDING_MODE) >> 5)
368
369static inline const floatx80 getExtendedConstant(const unsigned int nIndex)
370{
371 extern const floatx80 floatx80Constant[];
372 return floatx80Constant[nIndex];
373}
374
375static inline const float64 getDoubleConstant(const unsigned int nIndex)
376{
377 extern const float64 float64Constant[];
378 return float64Constant[nIndex];
379}
380
381static inline const float32 getSingleConstant(const unsigned int nIndex)
382{
383 extern const float32 float32Constant[];
384 return float32Constant[nIndex];
385}
386
387extern unsigned int getRegisterCount(const unsigned int opcode);
388extern unsigned int getDestinationSize(const unsigned int opcode);
389
390#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-11 21:07:47 -0500