trap.c revision 275794
1/*- 2 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 3 * Copyright (C) 1995, 1996 TooLs GmbH. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by TooLs GmbH. 17 * 4. The name of TooLs GmbH may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * $NetBSD: trap.c,v 1.58 2002/03/04 04:07:35 dbj Exp $ 32 */ 33 34#include <sys/cdefs.h> 35__FBSDID("$FreeBSD: stable/10/sys/powerpc/aim/trap.c 275794 2014-12-15 10:46:07Z kib $"); 36 37#include "opt_kdtrace.h" 38 39#include <sys/param.h> 40#include <sys/kdb.h> 41#include <sys/proc.h> 42#include <sys/ktr.h> 43#include <sys/lock.h> 44#include <sys/mutex.h> 45#include <sys/pioctl.h> 46#include <sys/ptrace.h> 47#include <sys/reboot.h> 48#include <sys/syscall.h> 49#include <sys/sysent.h> 50#include <sys/systm.h> 51#include <sys/kernel.h> 52#include <sys/uio.h> 53#include <sys/signalvar.h> 54#include <sys/vmmeter.h> 55 56#include <security/audit/audit.h> 57 58#include <vm/vm.h> 59#include <vm/pmap.h> 60#include <vm/vm_extern.h> 61#include <vm/vm_param.h> 62#include <vm/vm_kern.h> 63#include <vm/vm_map.h> 64#include <vm/vm_page.h> 65 66#include <machine/_inttypes.h> 67#include <machine/altivec.h> 68#include <machine/cpu.h> 69#include <machine/db_machdep.h> 70#include <machine/fpu.h> 71#include <machine/frame.h> 72#include <machine/pcb.h> 73#include <machine/pmap.h> 74#include <machine/psl.h> 75#include <machine/trap.h> 76#include <machine/spr.h> 77#include <machine/sr.h> 78 79static void trap_fatal(struct trapframe *frame); 80static void printtrap(u_int vector, struct trapframe *frame, int isfatal, 81 int user); 82static int trap_pfault(struct trapframe *frame, int user); 83static int fix_unaligned(struct thread *td, struct trapframe *frame); 84static int handle_onfault(struct trapframe *frame); 85static void syscall(struct trapframe *frame); 86 87#ifdef __powerpc64__ 88 void handle_kernel_slb_spill(int, register_t, register_t); 89static int handle_user_slb_spill(pmap_t pm, vm_offset_t addr); 90extern int n_slbs; 91#endif 92 93struct powerpc_exception { 94 u_int vector; 95 char *name; 96}; 97 98#ifdef KDTRACE_HOOKS 99#include <sys/dtrace_bsd.h> 100 101int (*dtrace_invop_jump_addr)(struct trapframe *); 102#endif 103 104static struct powerpc_exception powerpc_exceptions[] = { 105 { 0x0100, "system reset" }, 106 { 0x0200, "machine check" }, 107 { 0x0300, "data storage interrupt" }, 108 { 0x0380, "data segment exception" }, 109 { 0x0400, "instruction storage interrupt" }, 110 { 0x0480, "instruction segment exception" }, 111 { 0x0500, "external interrupt" }, 112 { 0x0600, "alignment" }, 113 { 0x0700, "program" }, 114 { 0x0800, "floating-point unavailable" }, 115 { 0x0900, "decrementer" }, 116 { 0x0c00, "system call" }, 117 { 0x0d00, "trace" }, 118 { 0x0e00, "floating-point assist" }, 119 { 0x0f00, "performance monitoring" }, 120 { 0x0f20, "altivec unavailable" }, 121 { 0x1000, "instruction tlb miss" }, 122 { 0x1100, "data load tlb miss" }, 123 { 0x1200, "data store tlb miss" }, 124 { 0x1300, "instruction breakpoint" }, 125 { 0x1400, "system management" }, 126 { 0x1600, "altivec assist" }, 127 { 0x1700, "thermal management" }, 128 { 0x2000, "run mode/trace" }, 129 { 0x3000, NULL } 130}; 131 132static const char * 133trapname(u_int vector) 134{ 135 struct powerpc_exception *pe; 136 137 for (pe = powerpc_exceptions; pe->vector != 0x3000; pe++) { 138 if (pe->vector == vector) 139 return (pe->name); 140 } 141 142 return ("unknown"); 143} 144 145void 146trap(struct trapframe *frame) 147{ 148 struct thread *td; 149 struct proc *p; 150#ifdef KDTRACE_HOOKS 151 uint32_t inst; 152#endif 153 int sig, type, user; 154 u_int ucode; 155 ksiginfo_t ksi; 156 157 PCPU_INC(cnt.v_trap); 158 159 td = curthread; 160 p = td->td_proc; 161 162 type = ucode = frame->exc; 163 sig = 0; 164 user = frame->srr1 & PSL_PR; 165 166 CTR3(KTR_TRAP, "trap: %s type=%s (%s)", td->td_name, 167 trapname(type), user ? "user" : "kernel"); 168 169#ifdef KDTRACE_HOOKS 170 /* 171 * A trap can occur while DTrace executes a probe. Before 172 * executing the probe, DTrace blocks re-scheduling and sets 173 * a flag in it's per-cpu flags to indicate that it doesn't 174 * want to fault. On returning from the probe, the no-fault 175 * flag is cleared and finally re-scheduling is enabled. 176 * 177 * If the DTrace kernel module has registered a trap handler, 178 * call it and if it returns non-zero, assume that it has 179 * handled the trap and modified the trap frame so that this 180 * function can return normally. 181 */ 182 /* 183 * XXXDTRACE: add pid probe handler here (if ever) 184 */ 185 if (dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, type)) 186 return; 187#endif 188 189 if (user) { 190 td->td_pticks = 0; 191 td->td_frame = frame; 192 if (td->td_ucred != p->p_ucred) 193 cred_update_thread(td); 194 195 /* User Mode Traps */ 196 switch (type) { 197 case EXC_RUNMODETRC: 198 case EXC_TRC: 199 frame->srr1 &= ~PSL_SE; 200 sig = SIGTRAP; 201 ucode = TRAP_TRACE; 202 break; 203 204#ifdef __powerpc64__ 205 case EXC_ISE: 206 case EXC_DSE: 207 if (handle_user_slb_spill(&p->p_vmspace->vm_pmap, 208 (type == EXC_ISE) ? frame->srr0 : 209 frame->cpu.aim.dar) != 0) { 210 sig = SIGSEGV; 211 ucode = SEGV_MAPERR; 212 } 213 break; 214#endif 215 case EXC_DSI: 216 case EXC_ISI: 217 sig = trap_pfault(frame, 1); 218 if (sig == SIGSEGV) 219 ucode = SEGV_MAPERR; 220 break; 221 222 case EXC_SC: 223 syscall(frame); 224 break; 225 226 case EXC_FPU: 227 KASSERT((td->td_pcb->pcb_flags & PCB_FPU) != PCB_FPU, 228 ("FPU already enabled for thread")); 229 enable_fpu(td); 230 break; 231 232 case EXC_VEC: 233 KASSERT((td->td_pcb->pcb_flags & PCB_VEC) != PCB_VEC, 234 ("Altivec already enabled for thread")); 235 enable_vec(td); 236 break; 237 238 case EXC_VECAST_G4: 239 case EXC_VECAST_G5: 240 /* 241 * We get a VPU assist exception for IEEE mode 242 * vector operations on denormalized floats. 243 * Emulating this is a giant pain, so for now, 244 * just switch off IEEE mode and treat them as 245 * zero. 246 */ 247 248 save_vec(td); 249 td->td_pcb->pcb_vec.vscr |= ALTIVEC_VSCR_NJ; 250 enable_vec(td); 251 break; 252 253 case EXC_ALI: 254 if (fix_unaligned(td, frame) != 0) { 255 sig = SIGBUS; 256 ucode = BUS_ADRALN; 257 } 258 else 259 frame->srr0 += 4; 260 break; 261 262 case EXC_PGM: 263 /* Identify the trap reason */ 264 if (frame->srr1 & EXC_PGM_TRAP) { 265#ifdef KDTRACE_HOOKS 266 inst = fuword32((const void *)frame->srr0); 267 if (inst == 0x0FFFDDDD && dtrace_pid_probe_ptr != NULL) { 268 struct reg regs; 269 fill_regs(td, ®s); 270 (*dtrace_pid_probe_ptr)(®s); 271 break; 272 } 273#endif 274 sig = SIGTRAP; 275 ucode = TRAP_BRKPT; 276 } else { 277 sig = ppc_instr_emulate(frame, td->td_pcb); 278 if (sig == SIGILL) { 279 if (frame->srr1 & EXC_PGM_PRIV) 280 ucode = ILL_PRVOPC; 281 else if (frame->srr1 & EXC_PGM_ILLEGAL) 282 ucode = ILL_ILLOPC; 283 } else if (sig == SIGFPE) 284 ucode = FPE_FLTINV; /* Punt for now, invalid operation. */ 285 } 286 break; 287 288 case EXC_MCHK: 289 /* 290 * Note that this may not be recoverable for the user 291 * process, depending on the type of machine check, 292 * but it at least prevents the kernel from dying. 293 */ 294 sig = SIGBUS; 295 ucode = BUS_OBJERR; 296 break; 297 298 default: 299 trap_fatal(frame); 300 } 301 } else { 302 /* Kernel Mode Traps */ 303 304 KASSERT(cold || td->td_ucred != NULL, 305 ("kernel trap doesn't have ucred")); 306 switch (type) { 307#ifdef KDTRACE_HOOKS 308 case EXC_PGM: 309 if (frame->srr1 & EXC_PGM_TRAP) { 310 if (*(uint32_t *)frame->srr0 == 0x7c810808) { 311 if (dtrace_invop_jump_addr != NULL) { 312 dtrace_invop_jump_addr(frame); 313 return; 314 } 315 } 316 } 317 break; 318#endif 319#ifdef __powerpc64__ 320 case EXC_DSE: 321 if ((frame->cpu.aim.dar & SEGMENT_MASK) == USER_ADDR) { 322 __asm __volatile ("slbmte %0, %1" :: 323 "r"(td->td_pcb->pcb_cpu.aim.usr_vsid), 324 "r"(USER_SLB_SLBE)); 325 return; 326 } 327 break; 328#endif 329 case EXC_DSI: 330 if (trap_pfault(frame, 0) == 0) 331 return; 332 break; 333 case EXC_MCHK: 334 if (handle_onfault(frame)) 335 return; 336 break; 337 default: 338 break; 339 } 340 trap_fatal(frame); 341 } 342 343 if (sig != 0) { 344 if (p->p_sysent->sv_transtrap != NULL) 345 sig = (p->p_sysent->sv_transtrap)(sig, type); 346 ksiginfo_init_trap(&ksi); 347 ksi.ksi_signo = sig; 348 ksi.ksi_code = (int) ucode; /* XXX, not POSIX */ 349 /* ksi.ksi_addr = ? */ 350 ksi.ksi_trapno = type; 351 trapsignal(td, &ksi); 352 } 353 354 userret(td, frame); 355} 356 357static void 358trap_fatal(struct trapframe *frame) 359{ 360 361 printtrap(frame->exc, frame, 1, (frame->srr1 & PSL_PR)); 362#ifdef KDB 363 if ((debugger_on_panic || kdb_active) && 364 kdb_trap(frame->exc, 0, frame)) 365 return; 366#endif 367 panic("%s trap", trapname(frame->exc)); 368} 369 370static void 371printtrap(u_int vector, struct trapframe *frame, int isfatal, int user) 372{ 373 374 printf("\n"); 375 printf("%s %s trap:\n", isfatal ? "fatal" : "handled", 376 user ? "user" : "kernel"); 377 printf("\n"); 378 printf(" exception = 0x%x (%s)\n", vector, trapname(vector)); 379 switch (vector) { 380 case EXC_DSE: 381 case EXC_DSI: 382 printf(" virtual address = 0x%" PRIxPTR "\n", 383 frame->cpu.aim.dar); 384 printf(" dsisr = 0x%" PRIxPTR "\n", 385 frame->cpu.aim.dsisr); 386 break; 387 case EXC_ISE: 388 case EXC_ISI: 389 printf(" virtual address = 0x%" PRIxPTR "\n", frame->srr0); 390 break; 391 } 392 printf(" srr0 = 0x%" PRIxPTR "\n", frame->srr0); 393 printf(" srr1 = 0x%" PRIxPTR "\n", frame->srr1); 394 printf(" lr = 0x%" PRIxPTR "\n", frame->lr); 395 printf(" curthread = %p\n", curthread); 396 if (curthread != NULL) 397 printf(" pid = %d, comm = %s\n", 398 curthread->td_proc->p_pid, curthread->td_name); 399 printf("\n"); 400} 401 402/* 403 * Handles a fatal fault when we have onfault state to recover. Returns 404 * non-zero if there was onfault recovery state available. 405 */ 406static int 407handle_onfault(struct trapframe *frame) 408{ 409 struct thread *td; 410 faultbuf *fb; 411 412 td = curthread; 413 fb = td->td_pcb->pcb_onfault; 414 if (fb != NULL) { 415 frame->srr0 = (*fb)[0]; 416 frame->fixreg[1] = (*fb)[1]; 417 frame->fixreg[2] = (*fb)[2]; 418 frame->fixreg[3] = 1; 419 frame->cr = (*fb)[3]; 420 bcopy(&(*fb)[4], &frame->fixreg[13], 421 19 * sizeof(register_t)); 422 return (1); 423 } 424 return (0); 425} 426 427int 428cpu_fetch_syscall_args(struct thread *td, struct syscall_args *sa) 429{ 430 struct proc *p; 431 struct trapframe *frame; 432 caddr_t params; 433 size_t argsz; 434 int error, n, i; 435 436 p = td->td_proc; 437 frame = td->td_frame; 438 439 sa->code = frame->fixreg[0]; 440 params = (caddr_t)(frame->fixreg + FIRSTARG); 441 n = NARGREG; 442 443 if (sa->code == SYS_syscall) { 444 /* 445 * code is first argument, 446 * followed by actual args. 447 */ 448 sa->code = *(register_t *) params; 449 params += sizeof(register_t); 450 n -= 1; 451 } else if (sa->code == SYS___syscall) { 452 /* 453 * Like syscall, but code is a quad, 454 * so as to maintain quad alignment 455 * for the rest of the args. 456 */ 457 if (SV_PROC_FLAG(p, SV_ILP32)) { 458 params += sizeof(register_t); 459 sa->code = *(register_t *) params; 460 params += sizeof(register_t); 461 n -= 2; 462 } else { 463 sa->code = *(register_t *) params; 464 params += sizeof(register_t); 465 n -= 1; 466 } 467 } 468 469 if (p->p_sysent->sv_mask) 470 sa->code &= p->p_sysent->sv_mask; 471 if (sa->code >= p->p_sysent->sv_size) 472 sa->callp = &p->p_sysent->sv_table[0]; 473 else 474 sa->callp = &p->p_sysent->sv_table[sa->code]; 475 476 sa->narg = sa->callp->sy_narg; 477 478 if (SV_PROC_FLAG(p, SV_ILP32)) { 479 argsz = sizeof(uint32_t); 480 481 for (i = 0; i < n; i++) 482 sa->args[i] = ((u_register_t *)(params))[i] & 483 0xffffffff; 484 } else { 485 argsz = sizeof(uint64_t); 486 487 for (i = 0; i < n; i++) 488 sa->args[i] = ((u_register_t *)(params))[i]; 489 } 490 491 if (sa->narg > n) 492 error = copyin(MOREARGS(frame->fixreg[1]), sa->args + n, 493 (sa->narg - n) * argsz); 494 else 495 error = 0; 496 497#ifdef __powerpc64__ 498 if (SV_PROC_FLAG(p, SV_ILP32) && sa->narg > n) { 499 /* Expand the size of arguments copied from the stack */ 500 501 for (i = sa->narg; i >= n; i--) 502 sa->args[i] = ((uint32_t *)(&sa->args[n]))[i-n]; 503 } 504#endif 505 506 if (error == 0) { 507 td->td_retval[0] = 0; 508 td->td_retval[1] = frame->fixreg[FIRSTARG + 1]; 509 } 510 return (error); 511} 512 513#include "../../kern/subr_syscall.c" 514 515void 516syscall(struct trapframe *frame) 517{ 518 struct thread *td; 519 struct syscall_args sa; 520 int error; 521 522 td = curthread; 523 td->td_frame = frame; 524 525#ifdef __powerpc64__ 526 /* 527 * Speculatively restore last user SLB segment, which we know is 528 * invalid already, since we are likely to do copyin()/copyout(). 529 */ 530 __asm __volatile ("slbmte %0, %1; isync" :: 531 "r"(td->td_pcb->pcb_cpu.aim.usr_vsid), "r"(USER_SLB_SLBE)); 532#endif 533 534 error = syscallenter(td, &sa); 535 syscallret(td, error, &sa); 536} 537 538#ifdef __powerpc64__ 539/* Handle kernel SLB faults -- runs in real mode, all seat belts off */ 540void 541handle_kernel_slb_spill(int type, register_t dar, register_t srr0) 542{ 543 struct slb *slbcache; 544 uint64_t slbe, slbv; 545 uint64_t esid, addr; 546 int i; 547 548 addr = (type == EXC_ISE) ? srr0 : dar; 549 slbcache = PCPU_GET(slb); 550 esid = (uintptr_t)addr >> ADDR_SR_SHFT; 551 slbe = (esid << SLBE_ESID_SHIFT) | SLBE_VALID; 552 553 /* See if the hardware flushed this somehow (can happen in LPARs) */ 554 for (i = 0; i < n_slbs; i++) 555 if (slbcache[i].slbe == (slbe | (uint64_t)i)) 556 return; 557 558 /* Not in the map, needs to actually be added */ 559 slbv = kernel_va_to_slbv(addr); 560 if (slbcache[USER_SLB_SLOT].slbe == 0) { 561 for (i = 0; i < n_slbs; i++) { 562 if (i == USER_SLB_SLOT) 563 continue; 564 if (!(slbcache[i].slbe & SLBE_VALID)) 565 goto fillkernslb; 566 } 567 568 if (i == n_slbs) 569 slbcache[USER_SLB_SLOT].slbe = 1; 570 } 571 572 /* Sacrifice a random SLB entry that is not the user entry */ 573 i = mftb() % n_slbs; 574 if (i == USER_SLB_SLOT) 575 i = (i+1) % n_slbs; 576 577fillkernslb: 578 /* Write new entry */ 579 slbcache[i].slbv = slbv; 580 slbcache[i].slbe = slbe | (uint64_t)i; 581 582 /* Trap handler will restore from cache on exit */ 583} 584 585static int 586handle_user_slb_spill(pmap_t pm, vm_offset_t addr) 587{ 588 struct slb *user_entry; 589 uint64_t esid; 590 int i; 591 592 esid = (uintptr_t)addr >> ADDR_SR_SHFT; 593 594 PMAP_LOCK(pm); 595 user_entry = user_va_to_slb_entry(pm, addr); 596 597 if (user_entry == NULL) { 598 /* allocate_vsid auto-spills it */ 599 (void)allocate_user_vsid(pm, esid, 0); 600 } else { 601 /* 602 * Check that another CPU has not already mapped this. 603 * XXX: Per-thread SLB caches would be better. 604 */ 605 for (i = 0; i < pm->pm_slb_len; i++) 606 if (pm->pm_slb[i] == user_entry) 607 break; 608 609 if (i == pm->pm_slb_len) 610 slb_insert_user(pm, user_entry); 611 } 612 PMAP_UNLOCK(pm); 613 614 return (0); 615} 616#endif 617 618static int 619trap_pfault(struct trapframe *frame, int user) 620{ 621 vm_offset_t eva, va; 622 struct thread *td; 623 struct proc *p; 624 vm_map_t map; 625 vm_prot_t ftype; 626 int rv; 627 register_t user_sr; 628 629 td = curthread; 630 p = td->td_proc; 631 if (frame->exc == EXC_ISI) { 632 eva = frame->srr0; 633 ftype = VM_PROT_EXECUTE; 634 if (frame->srr1 & SRR1_ISI_PFAULT) 635 ftype |= VM_PROT_READ; 636 } else { 637 eva = frame->cpu.aim.dar; 638 if (frame->cpu.aim.dsisr & DSISR_STORE) 639 ftype = VM_PROT_WRITE; 640 else 641 ftype = VM_PROT_READ; 642 } 643 644 if (user) { 645 map = &p->p_vmspace->vm_map; 646 } else { 647 if ((eva >> ADDR_SR_SHFT) == (USER_ADDR >> ADDR_SR_SHFT)) { 648 if (p->p_vmspace == NULL) 649 return (SIGSEGV); 650 651 map = &p->p_vmspace->vm_map; 652 653 user_sr = td->td_pcb->pcb_cpu.aim.usr_segm; 654 eva &= ADDR_PIDX | ADDR_POFF; 655 eva |= user_sr << ADDR_SR_SHFT; 656 } else { 657 map = kernel_map; 658 } 659 } 660 va = trunc_page(eva); 661 662 if (map != kernel_map) { 663 /* 664 * Keep swapout from messing with us during this 665 * critical time. 666 */ 667 PROC_LOCK(p); 668 ++p->p_lock; 669 PROC_UNLOCK(p); 670 671 /* Fault in the user page: */ 672 rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL); 673 674 PROC_LOCK(p); 675 --p->p_lock; 676 PROC_UNLOCK(p); 677 /* 678 * XXXDTRACE: add dtrace_doubletrap_func here? 679 */ 680 } else { 681 /* 682 * Don't have to worry about process locking or stacks in the 683 * kernel. 684 */ 685 rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL); 686 } 687 688 if (rv == KERN_SUCCESS) 689 return (0); 690 691 if (!user && handle_onfault(frame)) 692 return (0); 693 694 return (SIGSEGV); 695} 696 697/* 698 * For now, this only deals with the particular unaligned access case 699 * that gcc tends to generate. Eventually it should handle all of the 700 * possibilities that can happen on a 32-bit PowerPC in big-endian mode. 701 */ 702 703static int 704fix_unaligned(struct thread *td, struct trapframe *frame) 705{ 706 struct thread *fputhread; 707 int indicator, reg; 708 double *fpr; 709 710 indicator = EXC_ALI_OPCODE_INDICATOR(frame->cpu.aim.dsisr); 711 712 switch (indicator) { 713 case EXC_ALI_LFD: 714 case EXC_ALI_STFD: 715 reg = EXC_ALI_RST(frame->cpu.aim.dsisr); 716 fpr = &td->td_pcb->pcb_fpu.fpr[reg]; 717 fputhread = PCPU_GET(fputhread); 718 719 /* Juggle the FPU to ensure that we've initialized 720 * the FPRs, and that their current state is in 721 * the PCB. 722 */ 723 if (fputhread != td) { 724 if (fputhread) 725 save_fpu(fputhread); 726 enable_fpu(td); 727 } 728 save_fpu(td); 729 730 if (indicator == EXC_ALI_LFD) { 731 if (copyin((void *)frame->cpu.aim.dar, fpr, 732 sizeof(double)) != 0) 733 return -1; 734 enable_fpu(td); 735 } else { 736 if (copyout(fpr, (void *)frame->cpu.aim.dar, 737 sizeof(double)) != 0) 738 return -1; 739 } 740 return 0; 741 break; 742 } 743 744 return -1; 745} 746 747