1 /* $NetBSD: fpu_emu.c,v 1.14 2005/12/11 12:18:42 christos Exp $ */ 2 3 /* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Eduardo Horvath and Simon Burge for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Copyright (c) 1992, 1993 40 * The Regents of the University of California. All rights reserved. 41 * 42 * This software was developed by the Computer Systems Engineering group 43 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 44 * contributed to Berkeley. 45 * 46 * All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the University of 49 * California, Lawrence Berkeley Laboratory. 50 * 51 * Redistribution and use in source and binary forms, with or without 52 * modification, are permitted provided that the following conditions 53 * are met: 54 * 1. Redistributions of source code must retain the above copyright 55 * notice, this list of conditions and the following disclaimer. 56 * 2. Redistributions in binary form must reproduce the above copyright 57 * notice, this list of conditions and the following disclaimer in the 58 * documentation and/or other materials provided with the distribution. 59 * 3. Neither the name of the University nor the names of its contributors 60 * may be used to endorse or promote products derived from this software 61 * without specific prior written permission. 62 * 63 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 64 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 65 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 66 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 67 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 68 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 69 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 70 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 71 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 72 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 73 * SUCH DAMAGE. 74 * 75 * @(#)fpu.c 8.1 (Berkeley) 6/11/93 76 */ 77 78 #include <sys/cdefs.h> 79 __FBSDID("$FreeBSD$"); 80 81 #include "opt_ddb.h" 82 83 #include <sys/param.h> 84 #include <sys/systm.h> 85 #include <sys/kdb.h> 86 #include <sys/kernel.h> 87 #include <sys/proc.h> 88 #include <sys/sysctl.h> 89 #include <sys/signal.h> 90 #include <sys/syslog.h> 91 #include <sys/signalvar.h> 92 93 #include <machine/fpu.h> 94 #include <machine/reg.h> 95 96 #include <powerpc/fpu/fpu_emu.h> 97 #include <powerpc/fpu/fpu_extern.h> 98 #include <powerpc/fpu/fpu_instr.h> 99 100 SYSCTL_NODE(_hw, OID_AUTO, fpu_emu, CTLFLAG_RW, 0, "FPU emulator"); 101 102 #define FPU_EMU_EVCNT_DECL(name) \ 103 static u_int fpu_emu_evcnt_##name; \ 104 SYSCTL_INT(_hw_fpu_emu, OID_AUTO, evcnt_##name, CTLFLAG_RD, \ 105 &fpu_emu_evcnt_##name, 0, "") 106 107 #define FPU_EMU_EVCNT_INCR(name) fpu_emu_evcnt_##name++ 108 109 FPU_EMU_EVCNT_DECL(stfiwx); 110 FPU_EMU_EVCNT_DECL(fpstore); 111 FPU_EMU_EVCNT_DECL(fpload); 112 FPU_EMU_EVCNT_DECL(fcmpu); 113 FPU_EMU_EVCNT_DECL(frsp); 114 FPU_EMU_EVCNT_DECL(fctiw); 115 FPU_EMU_EVCNT_DECL(fcmpo); 116 FPU_EMU_EVCNT_DECL(mtfsb1); 117 FPU_EMU_EVCNT_DECL(fnegabs); 118 FPU_EMU_EVCNT_DECL(mcrfs); 119 FPU_EMU_EVCNT_DECL(mtfsb0); 120 FPU_EMU_EVCNT_DECL(fmr); 121 FPU_EMU_EVCNT_DECL(mtfsfi); 122 FPU_EMU_EVCNT_DECL(fnabs); 123 FPU_EMU_EVCNT_DECL(fabs); 124 FPU_EMU_EVCNT_DECL(mffs); 125 FPU_EMU_EVCNT_DECL(mtfsf); 126 FPU_EMU_EVCNT_DECL(fctid); 127 FPU_EMU_EVCNT_DECL(fcfid); 128 FPU_EMU_EVCNT_DECL(fdiv); 129 FPU_EMU_EVCNT_DECL(fsub); 130 FPU_EMU_EVCNT_DECL(fadd); 131 FPU_EMU_EVCNT_DECL(fsqrt); 132 FPU_EMU_EVCNT_DECL(fsel); 133 FPU_EMU_EVCNT_DECL(fpres); 134 FPU_EMU_EVCNT_DECL(fmul); 135 FPU_EMU_EVCNT_DECL(frsqrte); 136 FPU_EMU_EVCNT_DECL(fmulsub); 137 FPU_EMU_EVCNT_DECL(fmuladd); 138 FPU_EMU_EVCNT_DECL(fnmsub); 139 FPU_EMU_EVCNT_DECL(fnmadd); 140 141 /* FPSR exception masks */ 142 #define FPSR_EX_MSK (FPSCR_VX|FPSCR_OX|FPSCR_UX|FPSCR_ZX| \ 143 FPSCR_XX|FPSCR_VXSNAN|FPSCR_VXISI|FPSCR_VXIDI| \ 144 FPSCR_VXZDZ|FPSCR_VXIMZ|FPSCR_VXVC|FPSCR_VXSOFT|\ 145 FPSCR_VXSQRT|FPSCR_VXCVI) 146 #define FPSR_EX (FPSCR_VE|FPSCR_OE|FPSCR_UE|FPSCR_ZE|FPSCR_XE) 147 #define FPSR_EXOP (FPSR_EX_MSK&(~FPSR_EX)) 148 149 int fpe_debug = 0; 150 151 #ifdef DEBUG 152 vm_offset_t opc_disasm(vm_offset_t, int); 153 154 /* 155 * Dump a `fpn' structure. 156 */ 157 void 158 fpu_dumpfpn(struct fpn *fp) 159 { 160 static const char *class[] = { 161 "SNAN", "QNAN", "ZERO", "NUM", "INF" 162 }; 163 164 printf("%s %c.%x %x %x %xE%d", class[fp->fp_class + 2], 165 fp->fp_sign ? '-' : ' ', 166 fp->fp_mant[0], fp->fp_mant[1], 167 fp->fp_mant[2], fp->fp_mant[3], 168 fp->fp_exp); 169 } 170 #endif 171 172 /* 173 * fpu_execute returns the following error numbers (0 = no error): 174 */ 175 #define FPE 1 /* take a floating point exception */ 176 #define NOTFPU 2 /* not an FPU instruction */ 177 #define FAULT 3 178 179 180 /* 181 * Emulate a floating-point instruction. 182 * Return zero for success, else signal number. 183 * (Typically: zero, SIGFPE, SIGILL, SIGSEGV) 184 */ 185 int 186 fpu_emulate(struct trapframe *frame, struct fpreg *fpf) 187 { 188 static union instr insn; 189 static struct fpemu fe; 190 static int lastill = 0; 191 int sig; 192 193 /* initialize insn.is_datasize to tell it is *not* initialized */ 194 fe.fe_fpstate = fpf; 195 fe.fe_cx = 0; 196 197 /* always set this (to avoid a warning) */ 198 199 if (copyin((void *) (frame->srr0), &insn.i_int, sizeof (insn.i_int))) { 200 #ifdef DEBUG 201 printf("fpu_emulate: fault reading opcode\n"); 202 #endif 203 return SIGSEGV; 204 } 205 206 DPRINTF(FPE_EX, ("fpu_emulate: emulating insn %x at %p\n", 207 insn.i_int, (void *)frame->srr0)); 208 209 210 if ((insn.i_any.i_opcd == OPC_TWI) || 211 ((insn.i_any.i_opcd == OPC_integer_31) && 212 (insn.i_x.i_xo == OPC31_TW))) { 213 /* Check for the two trap insns. */ 214 DPRINTF(FPE_EX, ("fpu_emulate: SIGTRAP\n")); 215 return (SIGTRAP); 216 } 217 sig = 0; 218 switch (fpu_execute(frame, &fe, &insn)) { 219 case 0: 220 DPRINTF(FPE_EX, ("fpu_emulate: success\n")); 221 frame->srr0 += 4; 222 break; 223 224 case FPE: 225 DPRINTF(FPE_EX, ("fpu_emulate: SIGFPE\n")); 226 sig = SIGFPE; 227 break; 228 229 case FAULT: 230 DPRINTF(FPE_EX, ("fpu_emulate: SIGSEGV\n")); 231 sig = SIGSEGV; 232 break; 233 234 case NOTFPU: 235 default: 236 DPRINTF(FPE_EX, ("fpu_emulate: SIGILL\n")); 237 #ifdef DEBUG 238 if (fpe_debug & FPE_EX) { 239 printf("fpu_emulate: illegal insn %x at %p:", 240 insn.i_int, (void *) (frame->srr0)); 241 opc_disasm(frame->srr0, insn.i_int); 242 } 243 #endif 244 /* 245 * XXXX retry an illegal insn once due to cache issues. 246 */ 247 if (lastill == frame->srr0) { 248 sig = SIGILL; 249 #ifdef DEBUG 250 if (fpe_debug & FPE_EX) 251 kdb_enter(KDB_WHY_UNSET, "illegal instruction"); 252 #endif 253 } 254 lastill = frame->srr0; 255 break; 256 } 257 258 return (sig); 259 } 260 261 /* 262 * Execute an FPU instruction (one that runs entirely in the FPU; not 263 * FBfcc or STF, for instance). On return, fe->fe_fs->fs_fsr will be 264 * modified to reflect the setting the hardware would have left. 265 * 266 * Note that we do not catch all illegal opcodes, so you can, for instance, 267 * multiply two integers this way. 268 */ 269 int 270 fpu_execute(struct trapframe *tf, struct fpemu *fe, union instr *insn) 271 { 272 struct fpn *fp; 273 union instr instr = *insn; 274 int *a; 275 vm_offset_t addr; 276 int ra, rb, rc, rt, type, mask, fsr, cx, bf, setcr; 277 unsigned int cond; 278 struct fpreg *fs; 279 280 /* Setup work. */ 281 fp = NULL; 282 fs = fe->fe_fpstate; 283 fe->fe_fpscr = ((int *)&fs->fpscr)[1]; 284 285 /* 286 * On PowerPC all floating point values are stored in registers 287 * as doubles, even when used for single precision operations. 288 */ 289 type = FTYPE_DBL; 290 cond = instr.i_any.i_rc; 291 setcr = 0; 292 bf = 0; /* XXX gcc */ 293 294 #if defined(DDB) && defined(DEBUG) 295 if (fpe_debug & FPE_EX) { 296 vm_offset_t loc = tf->srr0; 297 298 printf("Trying to emulate: %p ", (void *)loc); 299 opc_disasm(loc, instr.i_int); 300 } 301 #endif 302 303 /* 304 * `Decode' and execute instruction. 305 */ 306 307 if ((instr.i_any.i_opcd >= OPC_LFS && instr.i_any.i_opcd <= OPC_STFDU) || 308 instr.i_any.i_opcd == OPC_integer_31) { 309 /* 310 * Handle load/store insns: 311 * 312 * Convert to/from single if needed, calculate addr, 313 * and update index reg if needed. 314 */ 315 double buf; 316 size_t size = sizeof(float); 317 int store, update; 318 319 cond = 0; /* ld/st never set condition codes */ 320 321 322 if (instr.i_any.i_opcd == OPC_integer_31) { 323 if (instr.i_x.i_xo == OPC31_STFIWX) { 324 FPU_EMU_EVCNT_INCR(stfiwx); 325 326 /* Store as integer */ 327 ra = instr.i_x.i_ra; 328 rb = instr.i_x.i_rb; 329 DPRINTF(FPE_INSN, ("reg %d has %x reg %d has %x\n", 330 ra, tf->fixreg[ra], rb, tf->fixreg[rb])); 331 332 addr = tf->fixreg[rb]; 333 if (ra != 0) 334 addr += tf->fixreg[ra]; 335 rt = instr.i_x.i_rt; 336 a = (int *)&fs->fpreg[rt]; 337 DPRINTF(FPE_INSN, 338 ("fpu_execute: Store INT %x at %p\n", 339 a[1], (void *)addr)); 340 if (copyout(&a[1], (void *)addr, sizeof(int))) 341 return (FAULT); 342 return (0); 343 } 344 345 if ((instr.i_x.i_xo & OPC31_FPMASK) != OPC31_FPOP) 346 /* Not an indexed FP load/store op */ 347 return (NOTFPU); 348 349 store = (instr.i_x.i_xo & 0x80); 350 if (instr.i_x.i_xo & 0x40) 351 size = sizeof(double); 352 else 353 type = FTYPE_SNG; 354 update = (instr.i_x.i_xo & 0x20); 355 356 /* calculate EA of load/store */ 357 ra = instr.i_x.i_ra; 358 rb = instr.i_x.i_rb; 359 DPRINTF(FPE_INSN, ("reg %d has %x reg %d has %x\n", 360 ra, tf->fixreg[ra], rb, tf->fixreg[rb])); 361 addr = tf->fixreg[rb]; 362 if (ra != 0) 363 addr += tf->fixreg[ra]; 364 rt = instr.i_x.i_rt; 365 } else { 366 store = instr.i_d.i_opcd & 0x4; 367 if (instr.i_d.i_opcd & 0x2) 368 size = sizeof(double); 369 else 370 type = FTYPE_SNG; 371 update = instr.i_d.i_opcd & 0x1; 372 373 /* calculate EA of load/store */ 374 ra = instr.i_d.i_ra; 375 addr = instr.i_d.i_d; 376 DPRINTF(FPE_INSN, ("reg %d has %x displ %x\n", 377 ra, tf->fixreg[ra], addr)); 378 if (ra != 0) 379 addr += tf->fixreg[ra]; 380 rt = instr.i_d.i_rt; 381 } 382 383 if (update && ra == 0) 384 return (NOTFPU); 385 386 if (store) { 387 /* Store */ 388 FPU_EMU_EVCNT_INCR(fpstore); 389 if (type != FTYPE_DBL) { 390 DPRINTF(FPE_INSN, 391 ("fpu_execute: Store SNG at %p\n", 392 (void *)addr)); 393 fpu_explode(fe, fp = &fe->fe_f1, FTYPE_DBL, rt); 394 fpu_implode(fe, fp, type, (void *)&buf); 395 if (copyout(&buf, (void *)addr, size)) 396 return (FAULT); 397 } else { 398 DPRINTF(FPE_INSN, 399 ("fpu_execute: Store DBL at %p\n", 400 (void *)addr)); 401 if (copyout(&fs->fpreg[rt], (void *)addr, size)) 402 return (FAULT); 403 } 404 } else { 405 /* Load */ 406 FPU_EMU_EVCNT_INCR(fpload); 407 DPRINTF(FPE_INSN, ("fpu_execute: Load from %p\n", 408 (void *)addr)); 409 if (copyin((const void *)addr, &fs->fpreg[rt], size)) 410 return (FAULT); 411 if (type != FTYPE_DBL) { 412 fpu_explode(fe, fp = &fe->fe_f1, type, rt); 413 fpu_implode(fe, fp, FTYPE_DBL, 414 (u_int *)&fs->fpreg[rt]); 415 } 416 } 417 if (update) 418 tf->fixreg[ra] = addr; 419 /* Complete. */ 420 return (0); 421 #ifdef notyet 422 } else if (instr.i_any.i_opcd == OPC_load_st_62) { 423 /* These are 64-bit extenstions */ 424 return (NOTFPU); 425 #endif 426 } else if (instr.i_any.i_opcd == OPC_sp_fp_59 || 427 instr.i_any.i_opcd == OPC_dp_fp_63) { 428 429 430 if (instr.i_any.i_opcd == OPC_dp_fp_63 && 431 !(instr.i_a.i_xo & OPC63M_MASK)) { 432 /* Format X */ 433 rt = instr.i_x.i_rt; 434 ra = instr.i_x.i_ra; 435 rb = instr.i_x.i_rb; 436 437 438 /* One of the special opcodes.... */ 439 switch (instr.i_x.i_xo) { 440 case OPC63_FCMPU: 441 FPU_EMU_EVCNT_INCR(fcmpu); 442 DPRINTF(FPE_INSN, ("fpu_execute: FCMPU\n")); 443 rt >>= 2; 444 fpu_explode(fe, &fe->fe_f1, type, ra); 445 fpu_explode(fe, &fe->fe_f2, type, rb); 446 fpu_compare(fe, 0); 447 /* Make sure we do the condition regs. */ 448 cond = 0; 449 /* N.B.: i_rs is already left shifted by two. */ 450 bf = instr.i_x.i_rs & 0xfc; 451 setcr = 1; 452 break; 453 454 case OPC63_FRSP: 455 /* 456 * Convert to single: 457 * 458 * PowerPC uses this to round a double 459 * precision value to single precision, 460 * but values in registers are always 461 * stored in double precision format. 462 */ 463 FPU_EMU_EVCNT_INCR(frsp); 464 DPRINTF(FPE_INSN, ("fpu_execute: FRSP\n")); 465 fpu_explode(fe, fp = &fe->fe_f1, FTYPE_DBL, rb); 466 fpu_implode(fe, fp, FTYPE_SNG, 467 (u_int *)&fs->fpreg[rt]); 468 fpu_explode(fe, fp = &fe->fe_f1, FTYPE_SNG, rt); 469 type = FTYPE_DBL; 470 break; 471 case OPC63_FCTIW: 472 case OPC63_FCTIWZ: 473 FPU_EMU_EVCNT_INCR(fctiw); 474 DPRINTF(FPE_INSN, ("fpu_execute: FCTIW\n")); 475 fpu_explode(fe, fp = &fe->fe_f1, type, rb); 476 type = FTYPE_INT; 477 break; 478 case OPC63_FCMPO: 479 FPU_EMU_EVCNT_INCR(fcmpo); 480 DPRINTF(FPE_INSN, ("fpu_execute: FCMPO\n")); 481 rt >>= 2; 482 fpu_explode(fe, &fe->fe_f1, type, ra); 483 fpu_explode(fe, &fe->fe_f2, type, rb); 484 fpu_compare(fe, 1); 485 /* Make sure we do the condition regs. */ 486 cond = 0; 487 /* N.B.: i_rs is already left shifted by two. */ 488 bf = instr.i_x.i_rs & 0xfc; 489 setcr = 1; 490 break; 491 case OPC63_MTFSB1: 492 FPU_EMU_EVCNT_INCR(mtfsb1); 493 DPRINTF(FPE_INSN, ("fpu_execute: MTFSB1\n")); 494 fe->fe_fpscr |= 495 (~(FPSCR_VX|FPSR_EX) & (1<<(31-rt))); 496 break; 497 case OPC63_FNEG: 498 FPU_EMU_EVCNT_INCR(fnegabs); 499 DPRINTF(FPE_INSN, ("fpu_execute: FNEGABS\n")); 500 memcpy(&fs->fpreg[rt], &fs->fpreg[rb], 501 sizeof(double)); 502 a = (int *)&fs->fpreg[rt]; 503 *a ^= (1 << 31); 504 break; 505 case OPC63_MCRFS: 506 FPU_EMU_EVCNT_INCR(mcrfs); 507 DPRINTF(FPE_INSN, ("fpu_execute: MCRFS\n")); 508 cond = 0; 509 rt &= 0x1c; 510 ra &= 0x1c; 511 /* Extract the bits we want */ 512 mask = (fe->fe_fpscr >> (28 - ra)) & 0xf; 513 /* Clear the bits we copied. */ 514 fe->fe_cx = 515 (FPSR_EX_MSK | (0xf << (28 - ra))); 516 fe->fe_fpscr &= fe->fe_cx; 517 /* Now shove them in the right part of cr */ 518 tf->cr &= ~(0xf << (28 - rt)); 519 tf->cr |= (mask << (28 - rt)); 520 break; 521 case OPC63_MTFSB0: 522 FPU_EMU_EVCNT_INCR(mtfsb0); 523 DPRINTF(FPE_INSN, ("fpu_execute: MTFSB0\n")); 524 fe->fe_fpscr &= 525 ((FPSCR_VX|FPSR_EX) & ~(1<<(31-rt))); 526 break; 527 case OPC63_FMR: 528 FPU_EMU_EVCNT_INCR(fmr); 529 DPRINTF(FPE_INSN, ("fpu_execute: FMR\n")); 530 memcpy(&fs->fpreg[rt], &fs->fpreg[rb], 531 sizeof(double)); 532 break; 533 case OPC63_MTFSFI: 534 FPU_EMU_EVCNT_INCR(mtfsfi); 535 DPRINTF(FPE_INSN, ("fpu_execute: MTFSFI\n")); 536 rb >>= 1; 537 rt &= 0x1c; /* Already left-shifted 4 */ 538 fe->fe_cx = rb << (28 - rt); 539 mask = 0xf<<(28 - rt); 540 fe->fe_fpscr = (fe->fe_fpscr & ~mask) | 541 fe->fe_cx; 542 /* XXX weird stuff about OX, FX, FEX, and VX should be handled */ 543 break; 544 case OPC63_FNABS: 545 FPU_EMU_EVCNT_INCR(fnabs); 546 DPRINTF(FPE_INSN, ("fpu_execute: FABS\n")); 547 memcpy(&fs->fpreg[rt], &fs->fpreg[rb], 548 sizeof(double)); 549 a = (int *)&fs->fpreg[rt]; 550 *a |= (1 << 31); 551 break; 552 case OPC63_FABS: 553 FPU_EMU_EVCNT_INCR(fabs); 554 DPRINTF(FPE_INSN, ("fpu_execute: FABS\n")); 555 memcpy(&fs->fpreg[rt], &fs->fpreg[rb], 556 sizeof(double)); 557 a = (int *)&fs->fpreg[rt]; 558 *a &= ~(1 << 31); 559 break; 560 case OPC63_MFFS: 561 FPU_EMU_EVCNT_INCR(mffs); 562 DPRINTF(FPE_INSN, ("fpu_execute: MFFS\n")); 563 memcpy(&fs->fpreg[rt], &fs->fpscr, 564 sizeof(fs->fpscr)); 565 break; 566 case OPC63_MTFSF: 567 FPU_EMU_EVCNT_INCR(mtfsf); 568 DPRINTF(FPE_INSN, ("fpu_execute: MTFSF\n")); 569 if ((rt = instr.i_xfl.i_flm) == -1) 570 mask = -1; 571 else { 572 mask = 0; 573 /* Convert 1 bit -> 4 bits */ 574 for (ra = 0; ra < 8; ra ++) 575 if (rt & (1<<ra)) 576 mask |= (0xf<<(4*ra)); 577 } 578 a = (int *)&fs->fpreg[rt]; 579 fe->fe_cx = mask & a[1]; 580 fe->fe_fpscr = (fe->fe_fpscr&~mask) | 581 (fe->fe_cx); 582 /* XXX weird stuff about OX, FX, FEX, and VX should be handled */ 583 break; 584 case OPC63_FCTID: 585 case OPC63_FCTIDZ: 586 FPU_EMU_EVCNT_INCR(fctid); 587 DPRINTF(FPE_INSN, ("fpu_execute: FCTID\n")); 588 fpu_explode(fe, fp = &fe->fe_f1, type, rb); 589 type = FTYPE_LNG; 590 break; 591 case OPC63_FCFID: 592 FPU_EMU_EVCNT_INCR(fcfid); 593 DPRINTF(FPE_INSN, ("fpu_execute: FCFID\n")); 594 type = FTYPE_LNG; 595 fpu_explode(fe, fp = &fe->fe_f1, type, rb); 596 type = FTYPE_DBL; 597 break; 598 default: 599 return (NOTFPU); 600 break; 601 } 602 } else { 603 /* Format A */ 604 rt = instr.i_a.i_frt; 605 ra = instr.i_a.i_fra; 606 rb = instr.i_a.i_frb; 607 rc = instr.i_a.i_frc; 608 609 type = FTYPE_SNG; 610 if (instr.i_any.i_opcd & 0x4) 611 type = FTYPE_DBL; 612 switch ((unsigned int)instr.i_a.i_xo) { 613 case OPC59_FDIVS: 614 FPU_EMU_EVCNT_INCR(fdiv); 615 DPRINTF(FPE_INSN, ("fpu_execute: FDIV\n")); 616 fpu_explode(fe, &fe->fe_f1, type, ra); 617 fpu_explode(fe, &fe->fe_f2, type, rb); 618 fp = fpu_div(fe); 619 break; 620 case OPC59_FSUBS: 621 FPU_EMU_EVCNT_INCR(fsub); 622 DPRINTF(FPE_INSN, ("fpu_execute: FSUB\n")); 623 fpu_explode(fe, &fe->fe_f1, type, ra); 624 fpu_explode(fe, &fe->fe_f2, type, rb); 625 fp = fpu_sub(fe); 626 break; 627 case OPC59_FADDS: 628 FPU_EMU_EVCNT_INCR(fadd); 629 DPRINTF(FPE_INSN, ("fpu_execute: FADD\n")); 630 fpu_explode(fe, &fe->fe_f1, type, ra); 631 fpu_explode(fe, &fe->fe_f2, type, rb); 632 fp = fpu_add(fe); 633 break; 634 case OPC59_FSQRTS: 635 FPU_EMU_EVCNT_INCR(fsqrt); 636 DPRINTF(FPE_INSN, ("fpu_execute: FSQRT\n")); 637 fpu_explode(fe, &fe->fe_f1, type, rb); 638 fp = fpu_sqrt(fe); 639 break; 640 case OPC63M_FSEL: 641 FPU_EMU_EVCNT_INCR(fsel); 642 DPRINTF(FPE_INSN, ("fpu_execute: FSEL\n")); 643 a = (int *)&fe->fe_fpstate->fpreg[ra]; 644 if ((*a & 0x80000000) && (*a & 0x7fffffff)) 645 /* fra < 0 */ 646 rc = rb; 647 DPRINTF(FPE_INSN, ("f%d => f%d\n", rc, rt)); 648 memcpy(&fs->fpreg[rt], &fs->fpreg[rc], 649 sizeof(double)); 650 break; 651 case OPC59_FRES: 652 FPU_EMU_EVCNT_INCR(fpres); 653 DPRINTF(FPE_INSN, ("fpu_execute: FPRES\n")); 654 fpu_explode(fe, &fe->fe_f1, type, rb); 655 fp = fpu_sqrt(fe); 656 /* now we've gotta overwrite the dest reg */ 657 *((int *)&fe->fe_fpstate->fpreg[rt]) = 1; 658 fpu_explode(fe, &fe->fe_f1, FTYPE_INT, rt); 659 fpu_div(fe); 660 break; 661 case OPC59_FMULS: 662 FPU_EMU_EVCNT_INCR(fmul); 663 DPRINTF(FPE_INSN, ("fpu_execute: FMUL\n")); 664 fpu_explode(fe, &fe->fe_f1, type, ra); 665 fpu_explode(fe, &fe->fe_f2, type, rc); 666 fp = fpu_mul(fe); 667 break; 668 case OPC63M_FRSQRTE: 669 /* Reciprocal sqrt() estimate */ 670 FPU_EMU_EVCNT_INCR(frsqrte); 671 DPRINTF(FPE_INSN, ("fpu_execute: FRSQRTE\n")); 672 fpu_explode(fe, &fe->fe_f1, type, rb); 673 fp = fpu_sqrt(fe); 674 fe->fe_f2 = *fp; 675 /* now we've gotta overwrite the dest reg */ 676 *((int *)&fe->fe_fpstate->fpreg[rt]) = 1; 677 fpu_explode(fe, &fe->fe_f1, FTYPE_INT, rt); 678 fpu_div(fe); 679 break; 680 case OPC59_FMSUBS: 681 FPU_EMU_EVCNT_INCR(fmulsub); 682 DPRINTF(FPE_INSN, ("fpu_execute: FMULSUB\n")); 683 fpu_explode(fe, &fe->fe_f1, type, ra); 684 fpu_explode(fe, &fe->fe_f2, type, rc); 685 fp = fpu_mul(fe); 686 fe->fe_f1 = *fp; 687 fpu_explode(fe, &fe->fe_f2, type, rb); 688 fp = fpu_sub(fe); 689 break; 690 case OPC59_FMADDS: 691 FPU_EMU_EVCNT_INCR(fmuladd); 692 DPRINTF(FPE_INSN, ("fpu_execute: FMULADD\n")); 693 fpu_explode(fe, &fe->fe_f1, type, ra); 694 fpu_explode(fe, &fe->fe_f2, type, rc); 695 fp = fpu_mul(fe); 696 fe->fe_f1 = *fp; 697 fpu_explode(fe, &fe->fe_f2, type, rb); 698 fp = fpu_add(fe); 699 break; 700 case OPC59_FNMSUBS: 701 FPU_EMU_EVCNT_INCR(fnmsub); 702 DPRINTF(FPE_INSN, ("fpu_execute: FNMSUB\n")); 703 fpu_explode(fe, &fe->fe_f1, type, ra); 704 fpu_explode(fe, &fe->fe_f2, type, rc); 705 fp = fpu_mul(fe); 706 fe->fe_f1 = *fp; 707 fpu_explode(fe, &fe->fe_f2, type, rb); 708 fp = fpu_sub(fe); 709 /* Negate */ 710 fp->fp_sign ^= 1; 711 break; 712 case OPC59_FNMADDS: 713 FPU_EMU_EVCNT_INCR(fnmadd); 714 DPRINTF(FPE_INSN, ("fpu_execute: FNMADD\n")); 715 fpu_explode(fe, &fe->fe_f1, type, ra); 716 fpu_explode(fe, &fe->fe_f2, type, rc); 717 fp = fpu_mul(fe); 718 fe->fe_f1 = *fp; 719 fpu_explode(fe, &fe->fe_f2, type, rb); 720 fp = fpu_add(fe); 721 /* Negate */ 722 fp->fp_sign ^= 1; 723 break; 724 default: 725 return (NOTFPU); 726 break; 727 } 728 } 729 } else { 730 return (NOTFPU); 731 } 732 733 /* 734 * ALU operation is complete. Collapse the result and then check 735 * for exceptions. If we got any, and they are enabled, do not 736 * alter the destination register, just stop with an exception. 737 * Otherwise set new current exceptions and accrue. 738 */ 739 if (fp) 740 fpu_implode(fe, fp, type, (u_int *)&fs->fpreg[rt]); 741 cx = fe->fe_cx; 742 fsr = fe->fe_fpscr; 743 if (cx != 0) { 744 fsr &= ~FPSCR_FX; 745 if ((cx^fsr)&FPSR_EX_MSK) 746 fsr |= FPSCR_FX; 747 mask = fsr & FPSR_EX; 748 mask <<= (25-3); 749 if (cx & mask) 750 fsr |= FPSCR_FEX; 751 if (cx & FPSCR_FPRF) { 752 /* Need to replace CC */ 753 fsr &= ~FPSCR_FPRF; 754 } 755 if (cx & (FPSR_EXOP)) 756 fsr |= FPSCR_VX; 757 fsr |= cx; 758 DPRINTF(FPE_INSN, ("fpu_execute: cx %x, fsr %x\n", cx, fsr)); 759 } 760 761 if (cond) { 762 cond = fsr & 0xf0000000; 763 /* Isolate condition codes */ 764 cond >>= 28; 765 /* Move fpu condition codes to cr[1] */ 766 tf->cr &= (0x0f000000); 767 tf->cr |= (cond<<24); 768 DPRINTF(FPE_INSN, ("fpu_execute: cr[1] <= %x\n", cond)); 769 } 770 771 if (setcr) { 772 cond = fsr & FPSCR_FPCC; 773 /* Isolate condition codes */ 774 cond <<= 16; 775 /* Move fpu condition codes to cr[1] */ 776 tf->cr &= ~(0xf0000000>>bf); 777 tf->cr |= (cond>>bf); 778 DPRINTF(FPE_INSN, ("fpu_execute: cr[%d] (cr=%x) <= %x\n", bf/4, tf->cr, cond)); 779 } 780 781 ((int *)&fs->fpscr)[1] = fsr; 782 if (fsr & FPSCR_FEX) 783 return(FPE); 784 return (0); /* success */ 785 } 786