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-rw-r--r--arch/arm/nwfpe/fpa11_cpdt.c392
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diff --git a/arch/arm/nwfpe/fpa11_cpdt.c b/arch/arm/nwfpe/fpa11_cpdt.c
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1/*
2 NetWinder Floating Point Emulator
3 (c) Rebel.com, 1998-1999
4 (c) Philip Blundell, 1998, 2001
5
6 Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21*/
22
23#include <linux/config.h>
24#include "fpa11.h"
25#include "softfloat.h"
26#include "fpopcode.h"
27#include "fpmodule.h"
28#include "fpmodule.inl"
29
30#include <asm/uaccess.h>
31
32static inline void loadSingle(const unsigned int Fn, const unsigned int __user *pMem)
33{
34 FPA11 *fpa11 = GET_FPA11();
35 fpa11->fType[Fn] = typeSingle;
36 get_user(fpa11->fpreg[Fn].fSingle, pMem);
37}
38
39static inline void loadDouble(const unsigned int Fn, const unsigned int __user *pMem)
40{
41 FPA11 *fpa11 = GET_FPA11();
42 unsigned int *p;
43 p = (unsigned int *) &fpa11->fpreg[Fn].fDouble;
44 fpa11->fType[Fn] = typeDouble;
45#ifdef __ARMEB__
46 get_user(p[0], &pMem[0]); /* sign & exponent */
47 get_user(p[1], &pMem[1]);
48#else
49 get_user(p[0], &pMem[1]);
50 get_user(p[1], &pMem[0]); /* sign & exponent */
51#endif
52}
53
54#ifdef CONFIG_FPE_NWFPE_XP
55static inline void loadExtended(const unsigned int Fn, const unsigned int __user *pMem)
56{
57 FPA11 *fpa11 = GET_FPA11();
58 unsigned int *p;
59 p = (unsigned int *) &fpa11->fpreg[Fn].fExtended;
60 fpa11->fType[Fn] = typeExtended;
61 get_user(p[0], &pMem[0]); /* sign & exponent */
62 get_user(p[1], &pMem[2]); /* ls bits */
63 get_user(p[2], &pMem[1]); /* ms bits */
64}
65#endif
66
67static inline void loadMultiple(const unsigned int Fn, const unsigned int __user *pMem)
68{
69 FPA11 *fpa11 = GET_FPA11();
70 register unsigned int *p;
71 unsigned long x;
72
73 p = (unsigned int *) &(fpa11->fpreg[Fn]);
74 get_user(x, &pMem[0]);
75 fpa11->fType[Fn] = (x >> 14) & 0x00000003;
76
77 switch (fpa11->fType[Fn]) {
78 case typeSingle:
79 case typeDouble:
80 {
81 get_user(p[0], &pMem[2]); /* Single */
82 get_user(p[1], &pMem[1]); /* double msw */
83 p[2] = 0; /* empty */
84 }
85 break;
86
87#ifdef CONFIG_FPE_NWFPE_XP
88 case typeExtended:
89 {
90 get_user(p[1], &pMem[2]);
91 get_user(p[2], &pMem[1]); /* msw */
92 p[0] = (x & 0x80003fff);
93 }
94 break;
95#endif
96 }
97}
98
99static inline void storeSingle(const unsigned int Fn, unsigned int __user *pMem)
100{
101 FPA11 *fpa11 = GET_FPA11();
102 union {
103 float32 f;
104 unsigned int i[1];
105 } val;
106
107 switch (fpa11->fType[Fn]) {
108 case typeDouble:
109 val.f = float64_to_float32(fpa11->fpreg[Fn].fDouble);
110 break;
111
112#ifdef CONFIG_FPE_NWFPE_XP
113 case typeExtended:
114 val.f = floatx80_to_float32(fpa11->fpreg[Fn].fExtended);
115 break;
116#endif
117
118 default:
119 val.f = fpa11->fpreg[Fn].fSingle;
120 }
121
122 put_user(val.i[0], pMem);
123}
124
125static inline void storeDouble(const unsigned int Fn, unsigned int __user *pMem)
126{
127 FPA11 *fpa11 = GET_FPA11();
128 union {
129 float64 f;
130 unsigned int i[2];
131 } val;
132
133 switch (fpa11->fType[Fn]) {
134 case typeSingle:
135 val.f = float32_to_float64(fpa11->fpreg[Fn].fSingle);
136 break;
137
138#ifdef CONFIG_FPE_NWFPE_XP
139 case typeExtended:
140 val.f = floatx80_to_float64(fpa11->fpreg[Fn].fExtended);
141 break;
142#endif
143
144 default:
145 val.f = fpa11->fpreg[Fn].fDouble;
146 }
147
148#ifdef __ARMEB__
149 put_user(val.i[0], &pMem[0]); /* msw */
150 put_user(val.i[1], &pMem[1]); /* lsw */
151#else
152 put_user(val.i[1], &pMem[0]); /* msw */
153 put_user(val.i[0], &pMem[1]); /* lsw */
154#endif
155}
156
157#ifdef CONFIG_FPE_NWFPE_XP
158static inline void storeExtended(const unsigned int Fn, unsigned int __user *pMem)
159{
160 FPA11 *fpa11 = GET_FPA11();
161 union {
162 floatx80 f;
163 unsigned int i[3];
164 } val;
165
166 switch (fpa11->fType[Fn]) {
167 case typeSingle:
168 val.f = float32_to_floatx80(fpa11->fpreg[Fn].fSingle);
169 break;
170
171 case typeDouble:
172 val.f = float64_to_floatx80(fpa11->fpreg[Fn].fDouble);
173 break;
174
175 default:
176 val.f = fpa11->fpreg[Fn].fExtended;
177 }
178
179 put_user(val.i[0], &pMem[0]); /* sign & exp */
180 put_user(val.i[1], &pMem[2]);
181 put_user(val.i[2], &pMem[1]); /* msw */
182}
183#endif
184
185static inline void storeMultiple(const unsigned int Fn, unsigned int __user *pMem)
186{
187 FPA11 *fpa11 = GET_FPA11();
188 register unsigned int nType, *p;
189
190 p = (unsigned int *) &(fpa11->fpreg[Fn]);
191 nType = fpa11->fType[Fn];
192
193 switch (nType) {
194 case typeSingle:
195 case typeDouble:
196 {
197 put_user(p[0], &pMem[2]); /* single */
198 put_user(p[1], &pMem[1]); /* double msw */
199 put_user(nType << 14, &pMem[0]);
200 }
201 break;
202
203#ifdef CONFIG_FPE_NWFPE_XP
204 case typeExtended:
205 {
206 put_user(p[2], &pMem[1]); /* msw */
207 put_user(p[1], &pMem[2]);
208 put_user((p[0] & 0x80003fff) | (nType << 14), &pMem[0]);
209 }
210 break;
211#endif
212 }
213}
214
215unsigned int PerformLDF(const unsigned int opcode)
216{
217 unsigned int __user *pBase, *pAddress, *pFinal;
218 unsigned int nRc = 1, write_back = WRITE_BACK(opcode);
219
220 pBase = (unsigned int __user *) readRegister(getRn(opcode));
221 if (REG_PC == getRn(opcode)) {
222 pBase += 2;
223 write_back = 0;
224 }
225
226 pFinal = pBase;
227 if (BIT_UP_SET(opcode))
228 pFinal += getOffset(opcode);
229 else
230 pFinal -= getOffset(opcode);
231
232 if (PREINDEXED(opcode))
233 pAddress = pFinal;
234 else
235 pAddress = pBase;
236
237 switch (opcode & MASK_TRANSFER_LENGTH) {
238 case TRANSFER_SINGLE:
239 loadSingle(getFd(opcode), pAddress);
240 break;
241 case TRANSFER_DOUBLE:
242 loadDouble(getFd(opcode), pAddress);
243 break;
244#ifdef CONFIG_FPE_NWFPE_XP
245 case TRANSFER_EXTENDED:
246 loadExtended(getFd(opcode), pAddress);
247 break;
248#endif
249 default:
250 nRc = 0;
251 }
252
253 if (write_back)
254 writeRegister(getRn(opcode), (unsigned long) pFinal);
255 return nRc;
256}
257
258unsigned int PerformSTF(const unsigned int opcode)
259{
260 unsigned int __user *pBase, *pAddress, *pFinal;
261 unsigned int nRc = 1, write_back = WRITE_BACK(opcode);
262
263 SetRoundingMode(ROUND_TO_NEAREST);
264
265 pBase = (unsigned int __user *) readRegister(getRn(opcode));
266 if (REG_PC == getRn(opcode)) {
267 pBase += 2;
268 write_back = 0;
269 }
270
271 pFinal = pBase;
272 if (BIT_UP_SET(opcode))
273 pFinal += getOffset(opcode);
274 else
275 pFinal -= getOffset(opcode);
276
277 if (PREINDEXED(opcode))
278 pAddress = pFinal;
279 else
280 pAddress = pBase;
281
282 switch (opcode & MASK_TRANSFER_LENGTH) {
283 case TRANSFER_SINGLE:
284 storeSingle(getFd(opcode), pAddress);
285 break;
286 case TRANSFER_DOUBLE:
287 storeDouble(getFd(opcode), pAddress);
288 break;
289#ifdef CONFIG_FPE_NWFPE_XP
290 case TRANSFER_EXTENDED:
291 storeExtended(getFd(opcode), pAddress);
292 break;
293#endif
294 default:
295 nRc = 0;
296 }
297
298 if (write_back)
299 writeRegister(getRn(opcode), (unsigned long) pFinal);
300 return nRc;
301}
302
303unsigned int PerformLFM(const unsigned int opcode)
304{
305 unsigned int __user *pBase, *pAddress, *pFinal;
306 unsigned int i, Fd, write_back = WRITE_BACK(opcode);
307
308 pBase = (unsigned int __user *) readRegister(getRn(opcode));
309 if (REG_PC == getRn(opcode)) {
310 pBase += 2;
311 write_back = 0;
312 }
313
314 pFinal = pBase;
315 if (BIT_UP_SET(opcode))
316 pFinal += getOffset(opcode);
317 else
318 pFinal -= getOffset(opcode);
319
320 if (PREINDEXED(opcode))
321 pAddress = pFinal;
322 else
323 pAddress = pBase;
324
325 Fd = getFd(opcode);
326 for (i = getRegisterCount(opcode); i > 0; i--) {
327 loadMultiple(Fd, pAddress);
328 pAddress += 3;
329 Fd++;
330 if (Fd == 8)
331 Fd = 0;
332 }
333
334 if (write_back)
335 writeRegister(getRn(opcode), (unsigned long) pFinal);
336 return 1;
337}
338
339unsigned int PerformSFM(const unsigned int opcode)
340{
341 unsigned int __user *pBase, *pAddress, *pFinal;
342 unsigned int i, Fd, write_back = WRITE_BACK(opcode);
343
344 pBase = (unsigned int __user *) readRegister(getRn(opcode));
345 if (REG_PC == getRn(opcode)) {
346 pBase += 2;
347 write_back = 0;
348 }
349
350 pFinal = pBase;
351 if (BIT_UP_SET(opcode))
352 pFinal += getOffset(opcode);
353 else
354 pFinal -= getOffset(opcode);
355
356 if (PREINDEXED(opcode))
357 pAddress = pFinal;
358 else
359 pAddress = pBase;
360
361 Fd = getFd(opcode);
362 for (i = getRegisterCount(opcode); i > 0; i--) {
363 storeMultiple(Fd, pAddress);
364 pAddress += 3;
365 Fd++;
366 if (Fd == 8)
367 Fd = 0;
368 }
369
370 if (write_back)
371 writeRegister(getRn(opcode), (unsigned long) pFinal);
372 return 1;
373}
374
375unsigned int EmulateCPDT(const unsigned int opcode)
376{
377 unsigned int nRc = 0;
378
379 if (LDF_OP(opcode)) {
380 nRc = PerformLDF(opcode);
381 } else if (LFM_OP(opcode)) {
382 nRc = PerformLFM(opcode);
383 } else if (STF_OP(opcode)) {
384 nRc = PerformSTF(opcode);
385 } else if (SFM_OP(opcode)) {
386 nRc = PerformSFM(opcode);
387 } else {
388 nRc = 0;
389 }
390
391 return nRc;
392}
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