trap.c revision 269701
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: head/sys/powerpc/aim/trap.c 269701 2014-08-08 06:22:32Z jhibbits $"); 36 37#include <sys/param.h> 38#include <sys/kdb.h> 39#include <sys/proc.h> 40#include <sys/ktr.h> 41#include <sys/lock.h> 42#include <sys/mutex.h> 43#include <sys/pioctl.h> 44#include <sys/ptrace.h> 45#include <sys/reboot.h> 46#include <sys/syscall.h> 47#include <sys/sysent.h> 48#include <sys/systm.h> 49#include <sys/uio.h> 50#include <sys/signalvar.h> 51#include <sys/vmmeter.h> 52 53#include <security/audit/audit.h> 54 55#include <vm/vm.h> 56#include <vm/pmap.h> 57#include <vm/vm_extern.h> 58#include <vm/vm_param.h> 59#include <vm/vm_kern.h> 60#include <vm/vm_map.h> 61#include <vm/vm_page.h> 62 63#include <machine/_inttypes.h> 64#include <machine/altivec.h> 65#include <machine/cpu.h> 66#include <machine/db_machdep.h> 67#include <machine/fpu.h> 68#include <machine/frame.h> 69#include <machine/pcb.h> 70#include <machine/pmap.h> 71#include <machine/psl.h> 72#include <machine/trap.h> 73#include <machine/spr.h> 74#include <machine/sr.h> 75 76static void trap_fatal(struct trapframe *frame); 77static void printtrap(u_int vector, struct trapframe *frame, int isfatal, 78 int user); 79static int trap_pfault(struct trapframe *frame, int user); 80static int fix_unaligned(struct thread *td, struct trapframe *frame); 81static int handle_onfault(struct trapframe *frame); 82static void syscall(struct trapframe *frame); 83 84#ifdef __powerpc64__ 85 void handle_kernel_slb_spill(int, register_t, register_t); 86static int handle_user_slb_spill(pmap_t pm, vm_offset_t addr); 87extern int n_slbs; 88#endif 89 90struct powerpc_exception { 91 u_int vector; 92 char *name; 93}; 94 95#ifdef KDTRACE_HOOKS 96#include <sys/dtrace_bsd.h> 97 98int (*dtrace_invop_jump_addr)(struct trapframe *); 99#endif 100 101static struct powerpc_exception powerpc_exceptions[] = { 102 { 0x0100, "system reset" }, 103 { 0x0200, "machine check" }, 104 { 0x0300, "data storage interrupt" }, 105 { 0x0380, "data segment exception" }, 106 { 0x0400, "instruction storage interrupt" }, 107 { 0x0480, "instruction segment exception" }, 108 { 0x0500, "external interrupt" }, 109 { 0x0600, "alignment" }, 110 { 0x0700, "program" }, 111 { 0x0800, "floating-point unavailable" }, 112 { 0x0900, "decrementer" }, 113 { 0x0c00, "system call" }, 114 { 0x0d00, "trace" }, 115 { 0x0e00, "floating-point assist" }, 116 { 0x0f00, "performance monitoring" }, 117 { 0x0f20, "altivec unavailable" }, 118 { 0x1000, "instruction tlb miss" }, 119 { 0x1100, "data load tlb miss" }, 120 { 0x1200, "data store tlb miss" }, 121 { 0x1300, "instruction breakpoint" }, 122 { 0x1400, "system management" }, 123 { 0x1600, "altivec assist" }, 124 { 0x1700, "thermal management" }, 125 { 0x2000, "run mode/trace" }, 126 { 0x3000, NULL } 127}; 128 129static const char * 130trapname(u_int vector) 131{ 132 struct powerpc_exception *pe; 133 134 for (pe = powerpc_exceptions; pe->vector != 0x3000; pe++) { 135 if (pe->vector == vector) 136 return (pe->name); 137 } 138 139 return ("unknown"); 140} 141 142void 143trap(struct trapframe *frame) 144{ 145 struct thread *td; 146 struct proc *p; 147#ifdef KDTRACE_HOOKS 148 uint32_t inst; 149#endif 150 int sig, type, user; 151 u_int ucode; 152 ksiginfo_t ksi; 153 154 PCPU_INC(cnt.v_trap); 155 156 td = curthread; 157 p = td->td_proc; 158 159 type = ucode = frame->exc; 160 sig = 0; 161 user = frame->srr1 & PSL_PR; 162 163 CTR3(KTR_TRAP, "trap: %s type=%s (%s)", td->td_name, 164 trapname(type), user ? "user" : "kernel"); 165 166#ifdef KDTRACE_HOOKS 167 /* 168 * A trap can occur while DTrace executes a probe. Before 169 * executing the probe, DTrace blocks re-scheduling and sets 170 * a flag in its per-cpu flags to indicate that it doesn't 171 * want to fault. On returning from the probe, the no-fault 172 * flag is cleared and finally re-scheduling is enabled. 173 * 174 * If the DTrace kernel module has registered a trap handler, 175 * call it and if it returns non-zero, assume that it has 176 * handled the trap and modified the trap frame so that this 177 * function can return normally. 178 */ 179 if (dtrace_trap_func != NULL && (*dtrace_trap_func)(frame)) 180 return; 181#endif 182 183 if (user) { 184 td->td_pticks = 0; 185 td->td_frame = frame; 186 if (td->td_ucred != p->p_ucred) 187 cred_update_thread(td); 188 189 /* User Mode Traps */ 190 switch (type) { 191 case EXC_RUNMODETRC: 192 case EXC_TRC: 193 frame->srr1 &= ~PSL_SE; 194 sig = SIGTRAP; 195 ucode = TRAP_TRACE; 196 break; 197 198#ifdef __powerpc64__ 199 case EXC_ISE: 200 case EXC_DSE: 201 if (handle_user_slb_spill(&p->p_vmspace->vm_pmap, 202 (type == EXC_ISE) ? frame->srr0 : 203 frame->cpu.aim.dar) != 0) { 204 sig = SIGSEGV; 205 ucode = SEGV_MAPERR; 206 } 207 break; 208#endif 209 case EXC_DSI: 210 case EXC_ISI: 211 sig = trap_pfault(frame, 1); 212 if (sig == SIGSEGV) 213 ucode = SEGV_MAPERR; 214 break; 215 216 case EXC_SC: 217 syscall(frame); 218 break; 219 220 case EXC_FPU: 221 KASSERT((td->td_pcb->pcb_flags & PCB_FPU) != PCB_FPU, 222 ("FPU already enabled for thread")); 223 enable_fpu(td); 224 break; 225 226 case EXC_VEC: 227 KASSERT((td->td_pcb->pcb_flags & PCB_VEC) != PCB_VEC, 228 ("Altivec already enabled for thread")); 229 enable_vec(td); 230 break; 231 232 case EXC_VECAST_G4: 233 case EXC_VECAST_G5: 234 /* 235 * We get a VPU assist exception for IEEE mode 236 * vector operations on denormalized floats. 237 * Emulating this is a giant pain, so for now, 238 * just switch off IEEE mode and treat them as 239 * zero. 240 */ 241 242 save_vec(td); 243 td->td_pcb->pcb_vec.vscr |= ALTIVEC_VSCR_NJ; 244 enable_vec(td); 245 break; 246 247 case EXC_ALI: 248 if (fix_unaligned(td, frame) != 0) { 249 sig = SIGBUS; 250 ucode = BUS_ADRALN; 251 } 252 else 253 frame->srr0 += 4; 254 break; 255 256 case EXC_PGM: 257 /* Identify the trap reason */ 258 if (frame->srr1 & EXC_PGM_TRAP) { 259#ifdef KDTRACE_HOOKS 260 inst = fuword32((const void *)frame->srr0); 261 if (inst == 0x0FFFDDDD && dtrace_pid_probe_ptr != NULL) { 262 struct reg regs; 263 fill_regs(td, ®s); 264 (*dtrace_pid_probe_ptr)(®s); 265 break; 266 } 267#endif 268 sig = SIGTRAP; 269 ucode = TRAP_BRKPT; 270 } else { 271 sig = ppc_instr_emulate(frame, td->td_pcb); 272 if (sig == SIGILL) { 273 if (frame->srr1 & EXC_PGM_PRIV) 274 ucode = ILL_PRVOPC; 275 else if (frame->srr1 & EXC_PGM_ILLEGAL) 276 ucode = ILL_ILLOPC; 277 } else if (sig == SIGFPE) 278 ucode = FPE_FLTINV; /* Punt for now, invalid operation. */ 279 } 280 break; 281 282 case EXC_MCHK: 283 /* 284 * Note that this may not be recoverable for the user 285 * process, depending on the type of machine check, 286 * but it at least prevents the kernel from dying. 287 */ 288 sig = SIGBUS; 289 ucode = BUS_OBJERR; 290 break; 291 292 default: 293 trap_fatal(frame); 294 } 295 } else { 296 /* Kernel Mode Traps */ 297 298 KASSERT(cold || td->td_ucred != NULL, 299 ("kernel trap doesn't have ucred")); 300 switch (type) { 301#ifdef KDTRACE_HOOKS 302 case EXC_PGM: 303 if (frame->srr1 & EXC_PGM_TRAP) { 304 if (*(uint32_t *)frame->srr0 == 0x7c810808) { 305 if (dtrace_invop_jump_addr != NULL) { 306 dtrace_invop_jump_addr(frame); 307 return; 308 } 309 } 310 } 311 break; 312#endif 313#ifdef __powerpc64__ 314 case EXC_DSE: 315 if ((frame->cpu.aim.dar & SEGMENT_MASK) == USER_ADDR) { 316 __asm __volatile ("slbmte %0, %1" :: 317 "r"(td->td_pcb->pcb_cpu.aim.usr_vsid), 318 "r"(USER_SLB_SLBE)); 319 return; 320 } 321 break; 322#endif 323 case EXC_DSI: 324 if (trap_pfault(frame, 0) == 0) 325 return; 326 break; 327 case EXC_MCHK: 328 if (handle_onfault(frame)) 329 return; 330 break; 331 default: 332 break; 333 } 334 trap_fatal(frame); 335 } 336 337 if (sig != 0) { 338 if (p->p_sysent->sv_transtrap != NULL) 339 sig = (p->p_sysent->sv_transtrap)(sig, type); 340 ksiginfo_init_trap(&ksi); 341 ksi.ksi_signo = sig; 342 ksi.ksi_code = (int) ucode; /* XXX, not POSIX */ 343 /* ksi.ksi_addr = ? */ 344 ksi.ksi_trapno = type; 345 trapsignal(td, &ksi); 346 } 347 348 userret(td, frame); 349} 350 351static void 352trap_fatal(struct trapframe *frame) 353{ 354 355 printtrap(frame->exc, frame, 1, (frame->srr1 & PSL_PR)); 356#ifdef KDB 357 if ((debugger_on_panic || kdb_active) && 358 kdb_trap(frame->exc, 0, frame)) 359 return; 360#endif 361 panic("%s trap", trapname(frame->exc)); 362} 363 364static void 365printtrap(u_int vector, struct trapframe *frame, int isfatal, int user) 366{ 367 368 printf("\n"); 369 printf("%s %s trap:\n", isfatal ? "fatal" : "handled", 370 user ? "user" : "kernel"); 371 printf("\n"); 372 printf(" exception = 0x%x (%s)\n", vector, trapname(vector)); 373 switch (vector) { 374 case EXC_DSE: 375 case EXC_DSI: 376 printf(" virtual address = 0x%" PRIxPTR "\n", 377 frame->cpu.aim.dar); 378 printf(" dsisr = 0x%" PRIxPTR "\n", 379 frame->cpu.aim.dsisr); 380 break; 381 case EXC_ISE: 382 case EXC_ISI: 383 printf(" virtual address = 0x%" PRIxPTR "\n", frame->srr0); 384 break; 385 } 386 printf(" srr0 = 0x%" PRIxPTR "\n", frame->srr0); 387 printf(" srr1 = 0x%" PRIxPTR "\n", frame->srr1); 388 printf(" lr = 0x%" PRIxPTR "\n", frame->lr); 389 printf(" curthread = %p\n", curthread); 390 if (curthread != NULL) 391 printf(" pid = %d, comm = %s\n", 392 curthread->td_proc->p_pid, curthread->td_name); 393 printf("\n"); 394} 395 396/* 397 * Handles a fatal fault when we have onfault state to recover. Returns 398 * non-zero if there was onfault recovery state available. 399 */ 400static int 401handle_onfault(struct trapframe *frame) 402{ 403 struct thread *td; 404 faultbuf *fb; 405 406 td = curthread; 407 fb = td->td_pcb->pcb_onfault; 408 if (fb != NULL) { 409 frame->srr0 = (*fb)[0]; 410 frame->fixreg[1] = (*fb)[1]; 411 frame->fixreg[2] = (*fb)[2]; 412 frame->fixreg[3] = 1; 413 frame->cr = (*fb)[3]; 414 bcopy(&(*fb)[4], &frame->fixreg[13], 415 19 * sizeof(register_t)); 416 return (1); 417 } 418 return (0); 419} 420 421int 422cpu_fetch_syscall_args(struct thread *td, struct syscall_args *sa) 423{ 424 struct proc *p; 425 struct trapframe *frame; 426 caddr_t params; 427 size_t argsz; 428 int error, n, i; 429 430 p = td->td_proc; 431 frame = td->td_frame; 432 433 sa->code = frame->fixreg[0]; 434 params = (caddr_t)(frame->fixreg + FIRSTARG); 435 n = NARGREG; 436 437 if (sa->code == SYS_syscall) { 438 /* 439 * code is first argument, 440 * followed by actual args. 441 */ 442 sa->code = *(register_t *) params; 443 params += sizeof(register_t); 444 n -= 1; 445 } else if (sa->code == SYS___syscall) { 446 /* 447 * Like syscall, but code is a quad, 448 * so as to maintain quad alignment 449 * for the rest of the args. 450 */ 451 if (SV_PROC_FLAG(p, SV_ILP32)) { 452 params += sizeof(register_t); 453 sa->code = *(register_t *) params; 454 params += sizeof(register_t); 455 n -= 2; 456 } else { 457 sa->code = *(register_t *) params; 458 params += sizeof(register_t); 459 n -= 1; 460 } 461 } 462 463 if (p->p_sysent->sv_mask) 464 sa->code &= p->p_sysent->sv_mask; 465 if (sa->code >= p->p_sysent->sv_size) 466 sa->callp = &p->p_sysent->sv_table[0]; 467 else 468 sa->callp = &p->p_sysent->sv_table[sa->code]; 469 470 sa->narg = sa->callp->sy_narg; 471 472 if (SV_PROC_FLAG(p, SV_ILP32)) { 473 argsz = sizeof(uint32_t); 474 475 for (i = 0; i < n; i++) 476 sa->args[i] = ((u_register_t *)(params))[i] & 477 0xffffffff; 478 } else { 479 argsz = sizeof(uint64_t); 480 481 for (i = 0; i < n; i++) 482 sa->args[i] = ((u_register_t *)(params))[i]; 483 } 484 485 if (sa->narg > n) 486 error = copyin(MOREARGS(frame->fixreg[1]), sa->args + n, 487 (sa->narg - n) * argsz); 488 else 489 error = 0; 490 491#ifdef __powerpc64__ 492 if (SV_PROC_FLAG(p, SV_ILP32) && sa->narg > n) { 493 /* Expand the size of arguments copied from the stack */ 494 495 for (i = sa->narg; i >= n; i--) 496 sa->args[i] = ((uint32_t *)(&sa->args[n]))[i-n]; 497 } 498#endif 499 500 if (error == 0) { 501 td->td_retval[0] = 0; 502 td->td_retval[1] = frame->fixreg[FIRSTARG + 1]; 503 } 504 return (error); 505} 506 507#include "../../kern/subr_syscall.c" 508 509void 510syscall(struct trapframe *frame) 511{ 512 struct thread *td; 513 struct syscall_args sa; 514 int error; 515 516 td = curthread; 517 td->td_frame = frame; 518 519#ifdef __powerpc64__ 520 /* 521 * Speculatively restore last user SLB segment, which we know is 522 * invalid already, since we are likely to do copyin()/copyout(). 523 */ 524 __asm __volatile ("slbmte %0, %1; isync" :: 525 "r"(td->td_pcb->pcb_cpu.aim.usr_vsid), "r"(USER_SLB_SLBE)); 526#endif 527 528 error = syscallenter(td, &sa); 529 syscallret(td, error, &sa); 530} 531 532#ifdef __powerpc64__ 533/* Handle kernel SLB faults -- runs in real mode, all seat belts off */ 534void 535handle_kernel_slb_spill(int type, register_t dar, register_t srr0) 536{ 537 struct slb *slbcache; 538 uint64_t slbe, slbv; 539 uint64_t esid, addr; 540 int i; 541 542 addr = (type == EXC_ISE) ? srr0 : dar; 543 slbcache = PCPU_GET(slb); 544 esid = (uintptr_t)addr >> ADDR_SR_SHFT; 545 slbe = (esid << SLBE_ESID_SHIFT) | SLBE_VALID; 546 547 /* See if the hardware flushed this somehow (can happen in LPARs) */ 548 for (i = 0; i < n_slbs; i++) 549 if (slbcache[i].slbe == (slbe | (uint64_t)i)) 550 return; 551 552 /* Not in the map, needs to actually be added */ 553 slbv = kernel_va_to_slbv(addr); 554 if (slbcache[USER_SLB_SLOT].slbe == 0) { 555 for (i = 0; i < n_slbs; i++) { 556 if (i == USER_SLB_SLOT) 557 continue; 558 if (!(slbcache[i].slbe & SLBE_VALID)) 559 goto fillkernslb; 560 } 561 562 if (i == n_slbs) 563 slbcache[USER_SLB_SLOT].slbe = 1; 564 } 565 566 /* Sacrifice a random SLB entry that is not the user entry */ 567 i = mftb() % n_slbs; 568 if (i == USER_SLB_SLOT) 569 i = (i+1) % n_slbs; 570 571fillkernslb: 572 /* Write new entry */ 573 slbcache[i].slbv = slbv; 574 slbcache[i].slbe = slbe | (uint64_t)i; 575 576 /* Trap handler will restore from cache on exit */ 577} 578 579static int 580handle_user_slb_spill(pmap_t pm, vm_offset_t addr) 581{ 582 struct slb *user_entry; 583 uint64_t esid; 584 int i; 585 586 esid = (uintptr_t)addr >> ADDR_SR_SHFT; 587 588 PMAP_LOCK(pm); 589 user_entry = user_va_to_slb_entry(pm, addr); 590 591 if (user_entry == NULL) { 592 /* allocate_vsid auto-spills it */ 593 (void)allocate_user_vsid(pm, esid, 0); 594 } else { 595 /* 596 * Check that another CPU has not already mapped this. 597 * XXX: Per-thread SLB caches would be better. 598 */ 599 for (i = 0; i < pm->pm_slb_len; i++) 600 if (pm->pm_slb[i] == user_entry) 601 break; 602 603 if (i == pm->pm_slb_len) 604 slb_insert_user(pm, user_entry); 605 } 606 PMAP_UNLOCK(pm); 607 608 return (0); 609} 610#endif 611 612static int 613trap_pfault(struct trapframe *frame, int user) 614{ 615 vm_offset_t eva, va; 616 struct thread *td; 617 struct proc *p; 618 vm_map_t map; 619 vm_prot_t ftype; 620 int rv; 621 register_t user_sr; 622 623 td = curthread; 624 p = td->td_proc; 625 if (frame->exc == EXC_ISI) { 626 eva = frame->srr0; 627 ftype = VM_PROT_EXECUTE; 628 if (frame->srr1 & SRR1_ISI_PFAULT) 629 ftype |= VM_PROT_READ; 630 } else { 631 eva = frame->cpu.aim.dar; 632 if (frame->cpu.aim.dsisr & DSISR_STORE) 633 ftype = VM_PROT_WRITE; 634 else 635 ftype = VM_PROT_READ; 636 } 637 638 if (user) { 639 map = &p->p_vmspace->vm_map; 640 } else { 641 if ((eva >> ADDR_SR_SHFT) == (USER_ADDR >> ADDR_SR_SHFT)) { 642 if (p->p_vmspace == NULL) 643 return (SIGSEGV); 644 645 map = &p->p_vmspace->vm_map; 646 647 user_sr = td->td_pcb->pcb_cpu.aim.usr_segm; 648 eva &= ADDR_PIDX | ADDR_POFF; 649 eva |= user_sr << ADDR_SR_SHFT; 650 } else { 651 map = kernel_map; 652 } 653 } 654 va = trunc_page(eva); 655 656 if (map != kernel_map) { 657 /* 658 * Keep swapout from messing with us during this 659 * critical time. 660 */ 661 PROC_LOCK(p); 662 ++p->p_lock; 663 PROC_UNLOCK(p); 664 665 /* Fault in the user page: */ 666 rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL); 667 668 PROC_LOCK(p); 669 --p->p_lock; 670 PROC_UNLOCK(p); 671 /* 672 * XXXDTRACE: add dtrace_doubletrap_func here? 673 */ 674 } else { 675 /* 676 * Don't have to worry about process locking or stacks in the 677 * kernel. 678 */ 679 rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL); 680 } 681 682 if (rv == KERN_SUCCESS) 683 return (0); 684 685 if (!user && handle_onfault(frame)) 686 return (0); 687 688 return (SIGSEGV); 689} 690 691/* 692 * For now, this only deals with the particular unaligned access case 693 * that gcc tends to generate. Eventually it should handle all of the 694 * possibilities that can happen on a 32-bit PowerPC in big-endian mode. 695 */ 696 697static int 698fix_unaligned(struct thread *td, struct trapframe *frame) 699{ 700 struct thread *fputhread; 701 int indicator, reg; 702 double *fpr; 703 704 indicator = EXC_ALI_OPCODE_INDICATOR(frame->cpu.aim.dsisr); 705 706 switch (indicator) { 707 case EXC_ALI_LFD: 708 case EXC_ALI_STFD: 709 reg = EXC_ALI_RST(frame->cpu.aim.dsisr); 710 fpr = &td->td_pcb->pcb_fpu.fpr[reg]; 711 fputhread = PCPU_GET(fputhread); 712 713 /* Juggle the FPU to ensure that we've initialized 714 * the FPRs, and that their current state is in 715 * the PCB. 716 */ 717 if (fputhread != td) { 718 if (fputhread) 719 save_fpu(fputhread); 720 enable_fpu(td); 721 } 722 save_fpu(td); 723 724 if (indicator == EXC_ALI_LFD) { 725 if (copyin((void *)frame->cpu.aim.dar, fpr, 726 sizeof(double)) != 0) 727 return -1; 728 enable_fpu(td); 729 } else { 730 if (copyout(fpr, (void *)frame->cpu.aim.dar, 731 sizeof(double)) != 0) 732 return -1; 733 } 734 return 0; 735 break; 736 } 737 738 return -1; 739} 740 741