root / target-arm / nwfpe / fpa11_cpdt.c @ afc7df11
History | View | Annotate | Download (8.7 kB)
1 |
/*
|
---|---|
2 |
NetWinder Floating Point Emulator
|
3 |
(c) Rebel.com, 1998-1999
|
4 |
(c) Philip Blundell, 1998
|
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 "fpa11.h" |
24 |
#include "softfloat.h" |
25 |
#include "fpopcode.h" |
26 |
//#include "fpmodule.h"
|
27 |
//#include "fpmodule.inl"
|
28 |
|
29 |
//#include <asm/uaccess.h>
|
30 |
|
31 |
static inline |
32 |
void loadSingle(const unsigned int Fn,const unsigned int *pMem) |
33 |
{ |
34 |
FPA11 *fpa11 = GET_FPA11(); |
35 |
fpa11->fType[Fn] = typeSingle; |
36 |
get_user(fpa11->fpreg[Fn].fSingle, pMem); |
37 |
} |
38 |
|
39 |
static inline |
40 |
void loadDouble(const unsigned int Fn,const unsigned int *pMem) |
41 |
{ |
42 |
FPA11 *fpa11 = GET_FPA11(); |
43 |
unsigned int *p; |
44 |
p = (unsigned int*)&fpa11->fpreg[Fn].fDouble; |
45 |
fpa11->fType[Fn] = typeDouble; |
46 |
#ifdef WORDS_BIGENDIAN
|
47 |
get_user(p[0], &pMem[0]); /* sign & exponent */ |
48 |
get_user(p[1], &pMem[1]); |
49 |
#else
|
50 |
get_user(p[0], &pMem[1]); |
51 |
get_user(p[1], &pMem[0]); /* sign & exponent */ |
52 |
#endif
|
53 |
} |
54 |
|
55 |
static inline |
56 |
void loadExtended(const unsigned int Fn,const unsigned int *pMem) |
57 |
{ |
58 |
FPA11 *fpa11 = GET_FPA11(); |
59 |
unsigned int *p; |
60 |
p = (unsigned int*)&fpa11->fpreg[Fn].fExtended; |
61 |
fpa11->fType[Fn] = typeExtended; |
62 |
get_user(p[0], &pMem[0]); /* sign & exponent */ |
63 |
get_user(p[1], &pMem[2]); /* ls bits */ |
64 |
get_user(p[2], &pMem[1]); /* ms bits */ |
65 |
} |
66 |
|
67 |
static inline |
68 |
void loadMultiple(const unsigned int Fn,const unsigned int *pMem) |
69 |
{ |
70 |
FPA11 *fpa11 = GET_FPA11(); |
71 |
register unsigned int *p; |
72 |
unsigned long x; |
73 |
|
74 |
p = (unsigned int*)&(fpa11->fpreg[Fn]); |
75 |
get_user(x, &pMem[0]);
|
76 |
fpa11->fType[Fn] = (x >> 14) & 0x00000003; |
77 |
|
78 |
switch (fpa11->fType[Fn])
|
79 |
{ |
80 |
case typeSingle:
|
81 |
case typeDouble:
|
82 |
{ |
83 |
get_user(p[0], &pMem[2]); /* Single */ |
84 |
get_user(p[1], &pMem[1]); /* double msw */ |
85 |
p[2] = 0; /* empty */ |
86 |
} |
87 |
break;
|
88 |
|
89 |
case typeExtended:
|
90 |
{ |
91 |
get_user(p[1], &pMem[2]); |
92 |
get_user(p[2], &pMem[1]); /* msw */ |
93 |
p[0] = (x & 0x80003fff); |
94 |
} |
95 |
break;
|
96 |
} |
97 |
} |
98 |
|
99 |
static inline |
100 |
void storeSingle(const unsigned int Fn,unsigned int *pMem) |
101 |
{ |
102 |
FPA11 *fpa11 = GET_FPA11(); |
103 |
float32 val; |
104 |
register unsigned int *p = (unsigned int*)&val; |
105 |
|
106 |
switch (fpa11->fType[Fn])
|
107 |
{ |
108 |
case typeDouble:
|
109 |
val = float64_to_float32(fpa11->fpreg[Fn].fDouble); |
110 |
break;
|
111 |
|
112 |
case typeExtended:
|
113 |
val = floatx80_to_float32(fpa11->fpreg[Fn].fExtended); |
114 |
break;
|
115 |
|
116 |
default: val = fpa11->fpreg[Fn].fSingle;
|
117 |
} |
118 |
|
119 |
put_user(p[0], pMem);
|
120 |
} |
121 |
|
122 |
static inline |
123 |
void storeDouble(const unsigned int Fn,unsigned int *pMem) |
124 |
{ |
125 |
FPA11 *fpa11 = GET_FPA11(); |
126 |
float64 val; |
127 |
register unsigned int *p = (unsigned int*)&val; |
128 |
|
129 |
switch (fpa11->fType[Fn])
|
130 |
{ |
131 |
case typeSingle:
|
132 |
val = float32_to_float64(fpa11->fpreg[Fn].fSingle); |
133 |
break;
|
134 |
|
135 |
case typeExtended:
|
136 |
val = floatx80_to_float64(fpa11->fpreg[Fn].fExtended); |
137 |
break;
|
138 |
|
139 |
default: val = fpa11->fpreg[Fn].fDouble;
|
140 |
} |
141 |
#ifdef WORDS_BIGENDIAN
|
142 |
put_user(p[0], &pMem[0]); /* msw */ |
143 |
put_user(p[1], &pMem[1]); /* lsw */ |
144 |
#else
|
145 |
put_user(p[1], &pMem[0]); /* msw */ |
146 |
put_user(p[0], &pMem[1]); /* lsw */ |
147 |
#endif
|
148 |
} |
149 |
|
150 |
static inline |
151 |
void storeExtended(const unsigned int Fn,unsigned int *pMem) |
152 |
{ |
153 |
FPA11 *fpa11 = GET_FPA11(); |
154 |
floatx80 val; |
155 |
register unsigned int *p = (unsigned int*)&val; |
156 |
|
157 |
switch (fpa11->fType[Fn])
|
158 |
{ |
159 |
case typeSingle:
|
160 |
val = float32_to_floatx80(fpa11->fpreg[Fn].fSingle); |
161 |
break;
|
162 |
|
163 |
case typeDouble:
|
164 |
val = float64_to_floatx80(fpa11->fpreg[Fn].fDouble); |
165 |
break;
|
166 |
|
167 |
default: val = fpa11->fpreg[Fn].fExtended;
|
168 |
} |
169 |
|
170 |
put_user(p[0], &pMem[0]); /* sign & exp */ |
171 |
put_user(p[1], &pMem[2]); |
172 |
put_user(p[2], &pMem[1]); /* msw */ |
173 |
} |
174 |
|
175 |
static inline |
176 |
void storeMultiple(const unsigned int Fn,unsigned int *pMem) |
177 |
{ |
178 |
FPA11 *fpa11 = GET_FPA11(); |
179 |
register unsigned int nType, *p; |
180 |
|
181 |
p = (unsigned int*)&(fpa11->fpreg[Fn]); |
182 |
nType = fpa11->fType[Fn]; |
183 |
|
184 |
switch (nType)
|
185 |
{ |
186 |
case typeSingle:
|
187 |
case typeDouble:
|
188 |
{ |
189 |
put_user(p[0], &pMem[2]); /* single */ |
190 |
put_user(p[1], &pMem[1]); /* double msw */ |
191 |
put_user(nType << 14, &pMem[0]); |
192 |
} |
193 |
break;
|
194 |
|
195 |
case typeExtended:
|
196 |
{ |
197 |
put_user(p[2], &pMem[1]); /* msw */ |
198 |
put_user(p[1], &pMem[2]); |
199 |
put_user((p[0] & 0x80003fff) | (nType << 14), &pMem[0]); |
200 |
} |
201 |
break;
|
202 |
} |
203 |
} |
204 |
|
205 |
unsigned int PerformLDF(const unsigned int opcode) |
206 |
{ |
207 |
unsigned int *pBase, *pAddress, *pFinal, nRc = 1, |
208 |
write_back = WRITE_BACK(opcode); |
209 |
|
210 |
//printk("PerformLDF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode));
|
211 |
|
212 |
pBase = (unsigned int*)readRegister(getRn(opcode)); |
213 |
if (REG_PC == getRn(opcode))
|
214 |
{ |
215 |
pBase += 2;
|
216 |
write_back = 0;
|
217 |
} |
218 |
|
219 |
pFinal = pBase; |
220 |
if (BIT_UP_SET(opcode))
|
221 |
pFinal += getOffset(opcode); |
222 |
else
|
223 |
pFinal -= getOffset(opcode); |
224 |
|
225 |
if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase; |
226 |
|
227 |
switch (opcode & MASK_TRANSFER_LENGTH)
|
228 |
{ |
229 |
case TRANSFER_SINGLE : loadSingle(getFd(opcode),pAddress); break; |
230 |
case TRANSFER_DOUBLE : loadDouble(getFd(opcode),pAddress); break; |
231 |
case TRANSFER_EXTENDED: loadExtended(getFd(opcode),pAddress); break; |
232 |
default: nRc = 0; |
233 |
} |
234 |
|
235 |
if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal); |
236 |
return nRc;
|
237 |
} |
238 |
|
239 |
unsigned int PerformSTF(const unsigned int opcode) |
240 |
{ |
241 |
unsigned int *pBase, *pAddress, *pFinal, nRc = 1, |
242 |
write_back = WRITE_BACK(opcode); |
243 |
|
244 |
//printk("PerformSTF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode));
|
245 |
SetRoundingMode(ROUND_TO_NEAREST); |
246 |
|
247 |
pBase = (unsigned int*)readRegister(getRn(opcode)); |
248 |
if (REG_PC == getRn(opcode))
|
249 |
{ |
250 |
pBase += 2;
|
251 |
write_back = 0;
|
252 |
} |
253 |
|
254 |
pFinal = pBase; |
255 |
if (BIT_UP_SET(opcode))
|
256 |
pFinal += getOffset(opcode); |
257 |
else
|
258 |
pFinal -= getOffset(opcode); |
259 |
|
260 |
if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase; |
261 |
|
262 |
switch (opcode & MASK_TRANSFER_LENGTH)
|
263 |
{ |
264 |
case TRANSFER_SINGLE : storeSingle(getFd(opcode),pAddress); break; |
265 |
case TRANSFER_DOUBLE : storeDouble(getFd(opcode),pAddress); break; |
266 |
case TRANSFER_EXTENDED: storeExtended(getFd(opcode),pAddress); break; |
267 |
default: nRc = 0; |
268 |
} |
269 |
|
270 |
if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal); |
271 |
return nRc;
|
272 |
} |
273 |
|
274 |
unsigned int PerformLFM(const unsigned int opcode) |
275 |
{ |
276 |
unsigned int i, Fd, *pBase, *pAddress, *pFinal, |
277 |
write_back = WRITE_BACK(opcode); |
278 |
|
279 |
pBase = (unsigned int*)readRegister(getRn(opcode)); |
280 |
if (REG_PC == getRn(opcode))
|
281 |
{ |
282 |
pBase += 2;
|
283 |
write_back = 0;
|
284 |
} |
285 |
|
286 |
pFinal = pBase; |
287 |
if (BIT_UP_SET(opcode))
|
288 |
pFinal += getOffset(opcode); |
289 |
else
|
290 |
pFinal -= getOffset(opcode); |
291 |
|
292 |
if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase; |
293 |
|
294 |
Fd = getFd(opcode); |
295 |
for (i=getRegisterCount(opcode);i>0;i--) |
296 |
{ |
297 |
loadMultiple(Fd,pAddress); |
298 |
pAddress += 3; Fd++;
|
299 |
if (Fd == 8) Fd = 0; |
300 |
} |
301 |
|
302 |
if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal); |
303 |
return 1; |
304 |
} |
305 |
|
306 |
unsigned int PerformSFM(const unsigned int opcode) |
307 |
{ |
308 |
unsigned int i, Fd, *pBase, *pAddress, *pFinal, |
309 |
write_back = WRITE_BACK(opcode); |
310 |
|
311 |
pBase = (unsigned int*)readRegister(getRn(opcode)); |
312 |
if (REG_PC == getRn(opcode))
|
313 |
{ |
314 |
pBase += 2;
|
315 |
write_back = 0;
|
316 |
} |
317 |
|
318 |
pFinal = pBase; |
319 |
if (BIT_UP_SET(opcode))
|
320 |
pFinal += getOffset(opcode); |
321 |
else
|
322 |
pFinal -= getOffset(opcode); |
323 |
|
324 |
if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase; |
325 |
|
326 |
Fd = getFd(opcode); |
327 |
for (i=getRegisterCount(opcode);i>0;i--) |
328 |
{ |
329 |
storeMultiple(Fd,pAddress); |
330 |
pAddress += 3; Fd++;
|
331 |
if (Fd == 8) Fd = 0; |
332 |
} |
333 |
|
334 |
if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal); |
335 |
return 1; |
336 |
} |
337 |
|
338 |
#if 1 |
339 |
unsigned int EmulateCPDT(const unsigned int opcode) |
340 |
{ |
341 |
unsigned int nRc = 0; |
342 |
|
343 |
//printk("EmulateCPDT(0x%08x)\n",opcode);
|
344 |
|
345 |
if (LDF_OP(opcode))
|
346 |
{ |
347 |
nRc = PerformLDF(opcode); |
348 |
} |
349 |
else if (LFM_OP(opcode)) |
350 |
{ |
351 |
nRc = PerformLFM(opcode); |
352 |
} |
353 |
else if (STF_OP(opcode)) |
354 |
{ |
355 |
nRc = PerformSTF(opcode); |
356 |
} |
357 |
else if (SFM_OP(opcode)) |
358 |
{ |
359 |
nRc = PerformSFM(opcode); |
360 |
} |
361 |
else
|
362 |
{ |
363 |
nRc = 0;
|
364 |
} |
365 |
|
366 |
return nRc;
|
367 |
} |
368 |
#endif
|