root / linux-user / arm / nwfpe / fpa11_cpdt.c @ d084469c
History | View | Annotate | Download (9.3 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, target_ulong addr) |
| 33 |
{
|
| 34 |
FPA11 *fpa11 = GET_FPA11(); |
| 35 |
fpa11->fType[Fn] = typeSingle; |
| 36 |
/* FIXME - handle failure of get_user() */
|
| 37 |
get_user_u32(fpa11->fpreg[Fn].fSingle, addr); |
| 38 |
} |
| 39 |
|
| 40 |
static inline |
| 41 |
void loadDouble(const unsigned int Fn, target_ulong addr) |
| 42 |
{
|
| 43 |
FPA11 *fpa11 = GET_FPA11(); |
| 44 |
unsigned int *p; |
| 45 |
p = (unsigned int*)&fpa11->fpreg[Fn].fDouble; |
| 46 |
fpa11->fType[Fn] = typeDouble; |
| 47 |
#ifdef WORDS_BIGENDIAN
|
| 48 |
/* FIXME - handle failure of get_user() */
|
| 49 |
get_user_u32(p[0], addr); /* sign & exponent */ |
| 50 |
get_user_u32(p[1], addr + 4); |
| 51 |
#else
|
| 52 |
/* FIXME - handle failure of get_user() */
|
| 53 |
get_user_u32(p[0], addr + 4); |
| 54 |
get_user_u32(p[1], addr); /* sign & exponent */ |
| 55 |
#endif
|
| 56 |
} |
| 57 |
|
| 58 |
static inline |
| 59 |
void loadExtended(const unsigned int Fn, target_ulong addr) |
| 60 |
{
|
| 61 |
FPA11 *fpa11 = GET_FPA11(); |
| 62 |
unsigned int *p; |
| 63 |
p = (unsigned int*)&fpa11->fpreg[Fn].fExtended; |
| 64 |
fpa11->fType[Fn] = typeExtended; |
| 65 |
/* FIXME - handle failure of get_user() */
|
| 66 |
get_user_u32(p[0], addr); /* sign & exponent */ |
| 67 |
get_user_u32(p[1], addr + 8); /* ls bits */ |
| 68 |
get_user_u32(p[2], addr + 4); /* ms bits */ |
| 69 |
} |
| 70 |
|
| 71 |
static inline |
| 72 |
void loadMultiple(const unsigned int Fn, target_ulong addr) |
| 73 |
{
|
| 74 |
FPA11 *fpa11 = GET_FPA11(); |
| 75 |
register unsigned int *p; |
| 76 |
unsigned long x; |
| 77 |
|
| 78 |
p = (unsigned int*)&(fpa11->fpreg[Fn]); |
| 79 |
/* FIXME - handle failure of get_user() */
|
| 80 |
get_user_u32(x, addr); |
| 81 |
fpa11->fType[Fn] = (x >> 14) & 0x00000003; |
| 82 |
|
| 83 |
switch (fpa11->fType[Fn])
|
| 84 |
{
|
| 85 |
case typeSingle:
|
| 86 |
case typeDouble:
|
| 87 |
{
|
| 88 |
/* FIXME - handle failure of get_user() */
|
| 89 |
get_user_u32(p[0], addr + 8); /* Single */ |
| 90 |
get_user_u32(p[1], addr + 4); /* double msw */ |
| 91 |
p[2] = 0; /* empty */ |
| 92 |
} |
| 93 |
break;
|
| 94 |
|
| 95 |
case typeExtended:
|
| 96 |
{
|
| 97 |
/* FIXME - handle failure of get_user() */
|
| 98 |
get_user_u32(p[1], addr + 8); |
| 99 |
get_user_u32(p[2], addr + 4); /* msw */ |
| 100 |
p[0] = (x & 0x80003fff); |
| 101 |
} |
| 102 |
break;
|
| 103 |
} |
| 104 |
} |
| 105 |
|
| 106 |
static inline |
| 107 |
void storeSingle(const unsigned int Fn, target_ulong addr) |
| 108 |
{
|
| 109 |
FPA11 *fpa11 = GET_FPA11(); |
| 110 |
float32 val; |
| 111 |
register unsigned int *p = (unsigned int*)&val; |
| 112 |
|
| 113 |
switch (fpa11->fType[Fn])
|
| 114 |
{
|
| 115 |
case typeDouble:
|
| 116 |
val = float64_to_float32(fpa11->fpreg[Fn].fDouble, &fpa11->fp_status); |
| 117 |
break;
|
| 118 |
|
| 119 |
case typeExtended:
|
| 120 |
val = floatx80_to_float32(fpa11->fpreg[Fn].fExtended, &fpa11->fp_status); |
| 121 |
break;
|
| 122 |
|
| 123 |
default: val = fpa11->fpreg[Fn].fSingle;
|
| 124 |
} |
| 125 |
|
| 126 |
/* FIXME - handle put_user() failures */
|
| 127 |
put_user_u32(p[0], addr);
|
| 128 |
} |
| 129 |
|
| 130 |
static inline |
| 131 |
void storeDouble(const unsigned int Fn, target_ulong addr) |
| 132 |
{
|
| 133 |
FPA11 *fpa11 = GET_FPA11(); |
| 134 |
float64 val; |
| 135 |
register unsigned int *p = (unsigned int*)&val; |
| 136 |
|
| 137 |
switch (fpa11->fType[Fn])
|
| 138 |
{
|
| 139 |
case typeSingle:
|
| 140 |
val = float32_to_float64(fpa11->fpreg[Fn].fSingle, &fpa11->fp_status); |
| 141 |
break;
|
| 142 |
|
| 143 |
case typeExtended:
|
| 144 |
val = floatx80_to_float64(fpa11->fpreg[Fn].fExtended, &fpa11->fp_status); |
| 145 |
break;
|
| 146 |
|
| 147 |
default: val = fpa11->fpreg[Fn].fDouble;
|
| 148 |
} |
| 149 |
/* FIXME - handle put_user() failures */
|
| 150 |
#ifdef WORDS_BIGENDIAN
|
| 151 |
put_user_u32(p[0], addr); /* msw */ |
| 152 |
put_user_u32(p[1], addr + 4); /* lsw */ |
| 153 |
#else
|
| 154 |
put_user_u32(p[1], addr); /* msw */ |
| 155 |
put_user_u32(p[0], addr + 4); /* lsw */ |
| 156 |
#endif
|
| 157 |
} |
| 158 |
|
| 159 |
static inline |
| 160 |
void storeExtended(const unsigned int Fn, target_ulong addr) |
| 161 |
{
|
| 162 |
FPA11 *fpa11 = GET_FPA11(); |
| 163 |
floatx80 val; |
| 164 |
register unsigned int *p = (unsigned int*)&val; |
| 165 |
|
| 166 |
switch (fpa11->fType[Fn])
|
| 167 |
{
|
| 168 |
case typeSingle:
|
| 169 |
val = float32_to_floatx80(fpa11->fpreg[Fn].fSingle, &fpa11->fp_status); |
| 170 |
break;
|
| 171 |
|
| 172 |
case typeDouble:
|
| 173 |
val = float64_to_floatx80(fpa11->fpreg[Fn].fDouble, &fpa11->fp_status); |
| 174 |
break;
|
| 175 |
|
| 176 |
default: val = fpa11->fpreg[Fn].fExtended;
|
| 177 |
} |
| 178 |
|
| 179 |
/* FIXME - handle put_user() failures */
|
| 180 |
put_user_u32(p[0], addr); /* sign & exp */ |
| 181 |
put_user_u32(p[1], addr + 8); |
| 182 |
put_user_u32(p[2], addr + 4); /* msw */ |
| 183 |
} |
| 184 |
|
| 185 |
static inline |
| 186 |
void storeMultiple(const unsigned int Fn, target_ulong addr) |
| 187 |
{
|
| 188 |
FPA11 *fpa11 = GET_FPA11(); |
| 189 |
register unsigned int nType, *p; |
| 190 |
|
| 191 |
p = (unsigned int*)&(fpa11->fpreg[Fn]); |
| 192 |
nType = fpa11->fType[Fn]; |
| 193 |
|
| 194 |
switch (nType)
|
| 195 |
{
|
| 196 |
case typeSingle:
|
| 197 |
case typeDouble:
|
| 198 |
{
|
| 199 |
put_user_u32(p[0], addr + 8); /* single */ |
| 200 |
put_user_u32(p[1], addr + 4); /* double msw */ |
| 201 |
put_user_u32(nType << 14, addr);
|
| 202 |
} |
| 203 |
break;
|
| 204 |
|
| 205 |
case typeExtended:
|
| 206 |
{
|
| 207 |
put_user_u32(p[2], addr + 4); /* msw */ |
| 208 |
put_user_u32(p[1], addr + 8); |
| 209 |
put_user_u32((p[0] & 0x80003fff) | (nType << 14), addr); |
| 210 |
} |
| 211 |
break;
|
| 212 |
} |
| 213 |
} |
| 214 |
|
| 215 |
static unsigned int PerformLDF(const unsigned int opcode) |
| 216 |
{
|
| 217 |
target_ulong pBase, pAddress, pFinal; |
| 218 |
unsigned int nRc = 1, |
| 219 |
write_back = WRITE_BACK(opcode); |
| 220 |
|
| 221 |
//printk("PerformLDF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode));
|
| 222 |
|
| 223 |
pBase = readRegister(getRn(opcode)); |
| 224 |
if (REG_PC == getRn(opcode))
|
| 225 |
{
|
| 226 |
pBase += 8;
|
| 227 |
write_back = 0;
|
| 228 |
} |
| 229 |
|
| 230 |
pFinal = pBase; |
| 231 |
if (BIT_UP_SET(opcode))
|
| 232 |
pFinal += getOffset(opcode) * 4;
|
| 233 |
else
|
| 234 |
pFinal -= getOffset(opcode) * 4;
|
| 235 |
|
| 236 |
if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase; |
| 237 |
|
| 238 |
switch (opcode & MASK_TRANSFER_LENGTH)
|
| 239 |
{
|
| 240 |
case TRANSFER_SINGLE : loadSingle(getFd(opcode),pAddress); break; |
| 241 |
case TRANSFER_DOUBLE : loadDouble(getFd(opcode),pAddress); break; |
| 242 |
case TRANSFER_EXTENDED: loadExtended(getFd(opcode),pAddress); break; |
| 243 |
default: nRc = 0; |
| 244 |
} |
| 245 |
|
| 246 |
if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal); |
| 247 |
return nRc;
|
| 248 |
} |
| 249 |
|
| 250 |
static unsigned int PerformSTF(const unsigned int opcode) |
| 251 |
{
|
| 252 |
target_ulong pBase, pAddress, pFinal; |
| 253 |
unsigned int nRc = 1, |
| 254 |
write_back = WRITE_BACK(opcode); |
| 255 |
|
| 256 |
//printk("PerformSTF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode));
|
| 257 |
SetRoundingMode(ROUND_TO_NEAREST); |
| 258 |
|
| 259 |
pBase = readRegister(getRn(opcode)); |
| 260 |
if (REG_PC == getRn(opcode))
|
| 261 |
{
|
| 262 |
pBase += 8;
|
| 263 |
write_back = 0;
|
| 264 |
} |
| 265 |
|
| 266 |
pFinal = pBase; |
| 267 |
if (BIT_UP_SET(opcode))
|
| 268 |
pFinal += getOffset(opcode) * 4;
|
| 269 |
else
|
| 270 |
pFinal -= getOffset(opcode) * 4;
|
| 271 |
|
| 272 |
if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase; |
| 273 |
|
| 274 |
switch (opcode & MASK_TRANSFER_LENGTH)
|
| 275 |
{
|
| 276 |
case TRANSFER_SINGLE : storeSingle(getFd(opcode),pAddress); break; |
| 277 |
case TRANSFER_DOUBLE : storeDouble(getFd(opcode),pAddress); break; |
| 278 |
case TRANSFER_EXTENDED: storeExtended(getFd(opcode),pAddress); break; |
| 279 |
default: nRc = 0; |
| 280 |
} |
| 281 |
|
| 282 |
if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal); |
| 283 |
return nRc;
|
| 284 |
} |
| 285 |
|
| 286 |
static unsigned int PerformLFM(const unsigned int opcode) |
| 287 |
{
|
| 288 |
unsigned int i, Fd, |
| 289 |
write_back = WRITE_BACK(opcode); |
| 290 |
target_ulong pBase, pAddress, pFinal; |
| 291 |
|
| 292 |
pBase = readRegister(getRn(opcode)); |
| 293 |
if (REG_PC == getRn(opcode))
|
| 294 |
{
|
| 295 |
pBase += 8;
|
| 296 |
write_back = 0;
|
| 297 |
} |
| 298 |
|
| 299 |
pFinal = pBase; |
| 300 |
if (BIT_UP_SET(opcode))
|
| 301 |
pFinal += getOffset(opcode) * 4;
|
| 302 |
else
|
| 303 |
pFinal -= getOffset(opcode) * 4;
|
| 304 |
|
| 305 |
if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase; |
| 306 |
|
| 307 |
Fd = getFd(opcode); |
| 308 |
for (i=getRegisterCount(opcode);i>0;i--) |
| 309 |
{
|
| 310 |
loadMultiple(Fd,pAddress); |
| 311 |
pAddress += 12; Fd++;
|
| 312 |
if (Fd == 8) Fd = 0; |
| 313 |
} |
| 314 |
|
| 315 |
if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal); |
| 316 |
return 1; |
| 317 |
} |
| 318 |
|
| 319 |
static unsigned int PerformSFM(const unsigned int opcode) |
| 320 |
{
|
| 321 |
unsigned int i, Fd, |
| 322 |
write_back = WRITE_BACK(opcode); |
| 323 |
target_ulong pBase, pAddress, pFinal; |
| 324 |
|
| 325 |
pBase = readRegister(getRn(opcode)); |
| 326 |
if (REG_PC == getRn(opcode))
|
| 327 |
{
|
| 328 |
pBase += 8;
|
| 329 |
write_back = 0;
|
| 330 |
} |
| 331 |
|
| 332 |
pFinal = pBase; |
| 333 |
if (BIT_UP_SET(opcode))
|
| 334 |
pFinal += getOffset(opcode) * 4;
|
| 335 |
else
|
| 336 |
pFinal -= getOffset(opcode) * 4;
|
| 337 |
|
| 338 |
if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase; |
| 339 |
|
| 340 |
Fd = getFd(opcode); |
| 341 |
for (i=getRegisterCount(opcode);i>0;i--) |
| 342 |
{
|
| 343 |
storeMultiple(Fd,pAddress); |
| 344 |
pAddress += 12; Fd++;
|
| 345 |
if (Fd == 8) Fd = 0; |
| 346 |
} |
| 347 |
|
| 348 |
if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal); |
| 349 |
return 1; |
| 350 |
} |
| 351 |
|
| 352 |
#if 1 |
| 353 |
unsigned int EmulateCPDT(const unsigned int opcode) |
| 354 |
{
|
| 355 |
unsigned int nRc = 0; |
| 356 |
|
| 357 |
//printk("EmulateCPDT(0x%08x)\n",opcode);
|
| 358 |
|
| 359 |
if (LDF_OP(opcode))
|
| 360 |
{
|
| 361 |
nRc = PerformLDF(opcode); |
| 362 |
} |
| 363 |
else if (LFM_OP(opcode)) |
| 364 |
{
|
| 365 |
nRc = PerformLFM(opcode); |
| 366 |
} |
| 367 |
else if (STF_OP(opcode)) |
| 368 |
{
|
| 369 |
nRc = PerformSTF(opcode); |
| 370 |
} |
| 371 |
else if (SFM_OP(opcode)) |
| 372 |
{
|
| 373 |
nRc = PerformSFM(opcode); |
| 374 |
} |
| 375 |
else
|
| 376 |
{
|
| 377 |
nRc = 0;
|
| 378 |
} |
| 379 |
|
| 380 |
return nRc;
|
| 381 |
} |
| 382 |
#endif
|