2 NetWinder Floating Point Emulator
3 (c) Rebel.com, 1998-1999
4 (c) Philip Blundell, 1998
6 Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
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.
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.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, see <http://www.gnu.org/licenses/>.
23 #include "fpu/softfloat.h"
25 //#include "fpmodule.h"
26 //#include "fpmodule.inl"
28 //#include <asm/uaccess.h>
31 void loadSingle(const unsigned int Fn, target_ulong addr)
33 FPA11 *fpa11 = GET_FPA11();
34 fpa11->fType[Fn] = typeSingle;
35 /* FIXME - handle failure of get_user() */
36 get_user_u32(float32_val(fpa11->fpreg[Fn].fSingle), addr);
40 void loadDouble(const unsigned int Fn, target_ulong addr)
42 FPA11 *fpa11 = GET_FPA11();
44 p = (unsigned int*)&fpa11->fpreg[Fn].fDouble;
45 fpa11->fType[Fn] = typeDouble;
46 #ifdef HOST_WORDS_BIGENDIAN
47 /* FIXME - handle failure of get_user() */
48 get_user_u32(p[0], addr); /* sign & exponent */
49 get_user_u32(p[1], addr + 4);
51 /* FIXME - handle failure of get_user() */
52 get_user_u32(p[0], addr + 4);
53 get_user_u32(p[1], addr); /* sign & exponent */
58 void loadExtended(const unsigned int Fn, target_ulong addr)
60 FPA11 *fpa11 = GET_FPA11();
62 p = (unsigned int*)&fpa11->fpreg[Fn].fExtended;
63 fpa11->fType[Fn] = typeExtended;
64 /* FIXME - handle failure of get_user() */
65 get_user_u32(p[0], addr); /* sign & exponent */
66 get_user_u32(p[1], addr + 8); /* ls bits */
67 get_user_u32(p[2], addr + 4); /* ms bits */
71 void loadMultiple(const unsigned int Fn, target_ulong addr)
73 FPA11 *fpa11 = GET_FPA11();
74 register unsigned int *p;
77 p = (unsigned int*)&(fpa11->fpreg[Fn]);
78 /* FIXME - handle failure of get_user() */
79 get_user_u32(x, addr);
80 fpa11->fType[Fn] = (x >> 14) & 0x00000003;
82 switch (fpa11->fType[Fn])
87 /* FIXME - handle failure of get_user() */
88 get_user_u32(p[0], addr + 8); /* Single */
89 get_user_u32(p[1], addr + 4); /* double msw */
96 /* FIXME - handle failure of get_user() */
97 get_user_u32(p[1], addr + 8);
98 get_user_u32(p[2], addr + 4); /* msw */
99 p[0] = (x & 0x80003fff);
106 void storeSingle(const unsigned int Fn, target_ulong addr)
108 FPA11 *fpa11 = GET_FPA11();
110 register unsigned int *p = (unsigned int*)&val;
112 switch (fpa11->fType[Fn])
115 val = float64_to_float32(fpa11->fpreg[Fn].fDouble, &fpa11->fp_status);
119 val = floatx80_to_float32(fpa11->fpreg[Fn].fExtended, &fpa11->fp_status);
122 default: val = fpa11->fpreg[Fn].fSingle;
125 /* FIXME - handle put_user() failures */
126 put_user_u32(p[0], addr);
130 void storeDouble(const unsigned int Fn, target_ulong addr)
132 FPA11 *fpa11 = GET_FPA11();
134 register unsigned int *p = (unsigned int*)&val;
136 switch (fpa11->fType[Fn])
139 val = float32_to_float64(fpa11->fpreg[Fn].fSingle, &fpa11->fp_status);
143 val = floatx80_to_float64(fpa11->fpreg[Fn].fExtended, &fpa11->fp_status);
146 default: val = fpa11->fpreg[Fn].fDouble;
148 /* FIXME - handle put_user() failures */
149 #ifdef HOST_WORDS_BIGENDIAN
150 put_user_u32(p[0], addr); /* msw */
151 put_user_u32(p[1], addr + 4); /* lsw */
153 put_user_u32(p[1], addr); /* msw */
154 put_user_u32(p[0], addr + 4); /* lsw */
159 void storeExtended(const unsigned int Fn, target_ulong addr)
161 FPA11 *fpa11 = GET_FPA11();
163 register unsigned int *p = (unsigned int*)&val;
165 switch (fpa11->fType[Fn])
168 val = float32_to_floatx80(fpa11->fpreg[Fn].fSingle, &fpa11->fp_status);
172 val = float64_to_floatx80(fpa11->fpreg[Fn].fDouble, &fpa11->fp_status);
175 default: val = fpa11->fpreg[Fn].fExtended;
178 /* FIXME - handle put_user() failures */
179 put_user_u32(p[0], addr); /* sign & exp */
180 put_user_u32(p[1], addr + 8);
181 put_user_u32(p[2], addr + 4); /* msw */
185 void storeMultiple(const unsigned int Fn, target_ulong addr)
187 FPA11 *fpa11 = GET_FPA11();
188 register unsigned int nType, *p;
190 p = (unsigned int*)&(fpa11->fpreg[Fn]);
191 nType = fpa11->fType[Fn];
198 put_user_u32(p[0], addr + 8); /* single */
199 put_user_u32(p[1], addr + 4); /* double msw */
200 put_user_u32(nType << 14, addr);
206 put_user_u32(p[2], addr + 4); /* msw */
207 put_user_u32(p[1], addr + 8);
208 put_user_u32((p[0] & 0x80003fff) | (nType << 14), addr);
214 static unsigned int PerformLDF(const unsigned int opcode)
216 target_ulong pBase, pAddress, pFinal;
217 unsigned int nRc = 1,
218 write_back = WRITE_BACK(opcode);
220 //printk("PerformLDF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode));
222 pBase = readRegister(getRn(opcode));
223 if (ARM_REG_PC == getRn(opcode))
230 if (BIT_UP_SET(opcode))
231 pFinal += getOffset(opcode) * 4;
233 pFinal -= getOffset(opcode) * 4;
235 if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase;
237 switch (opcode & MASK_TRANSFER_LENGTH)
239 case TRANSFER_SINGLE : loadSingle(getFd(opcode),pAddress); break;
240 case TRANSFER_DOUBLE : loadDouble(getFd(opcode),pAddress); break;
241 case TRANSFER_EXTENDED: loadExtended(getFd(opcode),pAddress); break;
245 if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
249 static unsigned int PerformSTF(const unsigned int opcode)
251 target_ulong pBase, pAddress, pFinal;
252 unsigned int nRc = 1,
253 write_back = WRITE_BACK(opcode);
255 //printk("PerformSTF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode));
256 SetRoundingMode(ROUND_TO_NEAREST);
258 pBase = readRegister(getRn(opcode));
259 if (ARM_REG_PC == getRn(opcode))
266 if (BIT_UP_SET(opcode))
267 pFinal += getOffset(opcode) * 4;
269 pFinal -= getOffset(opcode) * 4;
271 if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase;
273 switch (opcode & MASK_TRANSFER_LENGTH)
275 case TRANSFER_SINGLE : storeSingle(getFd(opcode),pAddress); break;
276 case TRANSFER_DOUBLE : storeDouble(getFd(opcode),pAddress); break;
277 case TRANSFER_EXTENDED: storeExtended(getFd(opcode),pAddress); break;
281 if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
285 static unsigned int PerformLFM(const unsigned int opcode)
288 write_back = WRITE_BACK(opcode);
289 target_ulong pBase, pAddress, pFinal;
291 pBase = readRegister(getRn(opcode));
292 if (ARM_REG_PC == getRn(opcode))
299 if (BIT_UP_SET(opcode))
300 pFinal += getOffset(opcode) * 4;
302 pFinal -= getOffset(opcode) * 4;
304 if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase;
307 for (i=getRegisterCount(opcode);i>0;i--)
309 loadMultiple(Fd,pAddress);
310 pAddress += 12; Fd++;
314 if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
318 static unsigned int PerformSFM(const unsigned int opcode)
321 write_back = WRITE_BACK(opcode);
322 target_ulong pBase, pAddress, pFinal;
324 pBase = readRegister(getRn(opcode));
325 if (ARM_REG_PC == getRn(opcode))
332 if (BIT_UP_SET(opcode))
333 pFinal += getOffset(opcode) * 4;
335 pFinal -= getOffset(opcode) * 4;
337 if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase;
340 for (i=getRegisterCount(opcode);i>0;i--)
342 storeMultiple(Fd,pAddress);
343 pAddress += 12; Fd++;
347 if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
352 unsigned int EmulateCPDT(const unsigned int opcode)
354 unsigned int nRc = 0;
356 //printk("EmulateCPDT(0x%08x)\n",opcode);
360 nRc = PerformLDF(opcode);
362 else if (LFM_OP(opcode))
364 nRc = PerformLFM(opcode);
366 else if (STF_OP(opcode))
368 nRc = PerformSTF(opcode);
370 else if (SFM_OP(opcode))
372 nRc = PerformSFM(opcode);