trap.c revision 271212
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 271212 2014-09-06 22:37:47Z jhibbits $"); 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/uio.h> 52#include <sys/signalvar.h> 53#include <sys/vmmeter.h> 54 55#include <security/audit/audit.h> 56 57#include <vm/vm.h> 58#include <vm/pmap.h> 59#include <vm/vm_extern.h> 60#include <vm/vm_param.h> 61#include <vm/vm_kern.h> 62#include <vm/vm_map.h> 63#include <vm/vm_page.h> 64 65#include <machine/_inttypes.h> 66#include <machine/altivec.h> 67#include <machine/cpu.h> 68#include <machine/db_machdep.h> 69#include <machine/fpu.h> 70#include <machine/frame.h> 71#include <machine/pcb.h> 72#include <machine/pmap.h> 73#include <machine/psl.h> 74#include <machine/trap.h> 75#include <machine/spr.h> 76#include <machine/sr.h> 77 78static void trap_fatal(struct trapframe *frame); 79static void printtrap(u_int vector, struct trapframe *frame, int isfatal, 80 int user); 81static int trap_pfault(struct trapframe *frame, int user); 82static int fix_unaligned(struct thread *td, struct trapframe *frame); 83static int handle_onfault(struct trapframe *frame); 84static void syscall(struct trapframe *frame); 85 86#ifdef __powerpc64__ 87 void handle_kernel_slb_spill(int, register_t, register_t); 88static int handle_user_slb_spill(pmap_t pm, vm_offset_t addr); 89extern int n_slbs; 90#endif 91 92struct powerpc_exception { 93 u_int vector; 94 char *name; 95}; 96 97#ifdef KDTRACE_HOOKS 98#include <sys/dtrace_bsd.h> 99 100int (*dtrace_invop_jump_addr)(struct trapframe *); 101#endif 102 103static struct powerpc_exception powerpc_exceptions[] = { 104 { 0x0100, "system reset" }, 105 { 0x0200, "machine check" }, 106 { 0x0300, "data storage interrupt" }, 107 { 0x0380, "data segment exception" }, 108 { 0x0400, "instruction storage interrupt" }, 109 { 0x0480, "instruction segment exception" }, 110 { 0x0500, "external interrupt" }, 111 { 0x0600, "alignment" }, 112 { 0x0700, "program" }, 113 { 0x0800, "floating-point unavailable" }, 114 { 0x0900, "decrementer" }, 115 { 0x0c00, "system call" }, 116 { 0x0d00, "trace" }, 117 { 0x0e00, "floating-point assist" }, 118 { 0x0f00, "performance monitoring" }, 119 { 0x0f20, "altivec unavailable" }, 120 { 0x1000, "instruction tlb miss" }, 121 { 0x1100, "data load tlb miss" }, 122 { 0x1200, "data store tlb miss" }, 123 { 0x1300, "instruction breakpoint" }, 124 { 0x1400, "system management" }, 125 { 0x1600, "altivec assist" }, 126 { 0x1700, "thermal management" }, 127 { 0x2000, "run mode/trace" }, 128 { 0x3000, NULL } 129}; 130 131static const char * 132trapname(u_int vector) 133{ 134 struct powerpc_exception *pe; 135 136 for (pe = powerpc_exceptions; pe->vector != 0x3000; pe++) { 137 if (pe->vector == vector) 138 return (pe->name); 139 } 140 141 return ("unknown"); 142} 143 144void 145trap(struct trapframe *frame) 146{ 147 struct thread *td; 148 struct proc *p; 149#ifdef KDTRACE_HOOKS 150 uint32_t inst; 151#endif 152 int sig, type, user; 153 u_int ucode; 154 ksiginfo_t ksi; 155 156 PCPU_INC(cnt.v_trap); 157 158 td = curthread; 159 p = td->td_proc; 160 161 type = ucode = frame->exc; 162 sig = 0; 163 user = frame->srr1 & PSL_PR; 164 165 CTR3(KTR_TRAP, "trap: %s type=%s (%s)", td->td_name, 166 trapname(type), user ? "user" : "kernel"); 167 168#ifdef KDTRACE_HOOKS 169 /* 170 * A trap can occur while DTrace executes a probe. Before 171 * executing the probe, DTrace blocks re-scheduling and sets 172 * a flag in it's per-cpu flags to indicate that it doesn't 173 * want to fault. On returning from the probe, the no-fault 174 * flag is cleared and finally re-scheduling is enabled. 175 * 176 * If the DTrace kernel module has registered a trap handler, 177 * call it and if it returns non-zero, assume that it has 178 * handled the trap and modified the trap frame so that this 179 * function can return normally. 180 */ 181 /* 182 * XXXDTRACE: add pid probe handler here (if ever) 183 */ 184 if (dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, type)) 185 return; 186#endif 187 188 if (user) { 189 td->td_pticks = 0; 190 td->td_frame = frame; 191 if (td->td_ucred != p->p_ucred) 192 cred_update_thread(td); 193 194 /* User Mode Traps */ 195 switch (type) { 196 case EXC_RUNMODETRC: 197 case EXC_TRC: 198 frame->srr1 &= ~PSL_SE; 199 sig = SIGTRAP; 200 ucode = TRAP_TRACE; 201 break; 202 203#ifdef __powerpc64__ 204 case EXC_ISE: 205 case EXC_DSE: 206 if (handle_user_slb_spill(&p->p_vmspace->vm_pmap, 207 (type == EXC_ISE) ? frame->srr0 : 208 frame->cpu.aim.dar) != 0) { 209 sig = SIGSEGV; 210 ucode = SEGV_MAPERR; 211 } 212 break; 213#endif 214 case EXC_DSI: 215 case EXC_ISI: 216 sig = trap_pfault(frame, 1); 217 if (sig == SIGSEGV) 218 ucode = SEGV_MAPERR; 219 break; 220 221 case EXC_SC: 222 syscall(frame); 223 break; 224 225 case EXC_FPU: 226 KASSERT((td->td_pcb->pcb_flags & PCB_FPU) != PCB_FPU, 227 ("FPU already enabled for thread")); 228 enable_fpu(td); 229 break; 230 231 case EXC_VEC: 232 KASSERT((td->td_pcb->pcb_flags & PCB_VEC) != PCB_VEC, 233 ("Altivec already enabled for thread")); 234 enable_vec(td); 235 break; 236 237 case EXC_VECAST_G4: 238 case EXC_VECAST_G5: 239 /* 240 * We get a VPU assist exception for IEEE mode 241 * vector operations on denormalized floats. 242 * Emulating this is a giant pain, so for now, 243 * just switch off IEEE mode and treat them as 244 * zero. 245 */ 246 247 save_vec(td); 248 td->td_pcb->pcb_vec.vscr |= ALTIVEC_VSCR_NJ; 249 enable_vec(td); 250 break; 251 252 case EXC_ALI: 253 if (fix_unaligned(td, frame) != 0) { 254 sig = SIGBUS; 255 ucode = BUS_ADRALN; 256 } 257 else 258 frame->srr0 += 4; 259 break; 260 261 case EXC_PGM: 262 /* Identify the trap reason */ 263 if (frame->srr1 & EXC_PGM_TRAP) { 264#ifdef KDTRACE_HOOKS 265 inst = fuword32((const void *)frame->srr0); 266 if (inst == 0x0FFFDDDD && dtrace_pid_probe_ptr != NULL) { 267 struct reg regs; 268 fill_regs(td, ®s); 269 (*dtrace_pid_probe_ptr)(®s); 270 break; 271 } 272#endif 273 sig = SIGTRAP; 274 ucode = TRAP_BRKPT; 275 } else { 276 sig = ppc_instr_emulate(frame, td->td_pcb); 277 if (sig == SIGILL) { 278 if (frame->srr1 & EXC_PGM_PRIV) 279 ucode = ILL_PRVOPC; 280 else if (frame->srr1 & EXC_PGM_ILLEGAL) 281 ucode = ILL_ILLOPC; 282 } else if (sig == SIGFPE) 283 ucode = FPE_FLTINV; /* Punt for now, invalid operation. */ 284 } 285 break; 286 287 case EXC_MCHK: 288 /* 289 * Note that this may not be recoverable for the user 290 * process, depending on the type of machine check, 291 * but it at least prevents the kernel from dying. 292 */ 293 sig = SIGBUS; 294 ucode = BUS_OBJERR; 295 break; 296 297 default: 298 trap_fatal(frame); 299 } 300 } else { 301 /* Kernel Mode Traps */ 302 303 KASSERT(cold || td->td_ucred != NULL, 304 ("kernel trap doesn't have ucred")); 305 switch (type) { 306#ifdef KDTRACE_HOOKS 307 case EXC_PGM: 308 if (frame->srr1 & EXC_PGM_TRAP) { 309 if (*(uint32_t *)frame->srr0 == 0x7c810808) { 310 if (dtrace_invop_jump_addr != NULL) { 311 dtrace_invop_jump_addr(frame); 312 return; 313 } 314 } 315 } 316 break; 317#endif 318#ifdef __powerpc64__ 319 case EXC_DSE: 320 if ((frame->cpu.aim.dar & SEGMENT_MASK) == USER_ADDR) { 321 __asm __volatile ("slbmte %0, %1" :: 322 "r"(td->td_pcb->pcb_cpu.aim.usr_vsid), 323 "r"(USER_SLB_SLBE)); 324 return; 325 } 326 break; 327#endif 328 case EXC_DSI: 329 if (trap_pfault(frame, 0) == 0) 330 return; 331 break; 332 case EXC_MCHK: 333 if (handle_onfault(frame)) 334 return; 335 break; 336 default: 337 break; 338 } 339 trap_fatal(frame); 340 } 341 342 if (sig != 0) { 343 if (p->p_sysent->sv_transtrap != NULL) 344 sig = (p->p_sysent->sv_transtrap)(sig, type); 345 ksiginfo_init_trap(&ksi); 346 ksi.ksi_signo = sig; 347 ksi.ksi_code = (int) ucode; /* XXX, not POSIX */ 348 /* ksi.ksi_addr = ? */ 349 ksi.ksi_trapno = type; 350 trapsignal(td, &ksi); 351 } 352 353 userret(td, frame); 354} 355 356static void 357trap_fatal(struct trapframe *frame) 358{ 359 360 printtrap(frame->exc, frame, 1, (frame->srr1 & PSL_PR)); 361#ifdef KDB 362 if ((debugger_on_panic || kdb_active) && 363 kdb_trap(frame->exc, 0, frame)) 364 return; 365#endif 366 panic("%s trap", trapname(frame->exc)); 367} 368 369static void 370printtrap(u_int vector, struct trapframe *frame, int isfatal, int user) 371{ 372 373 printf("\n"); 374 printf("%s %s trap:\n", isfatal ? "fatal" : "handled", 375 user ? "user" : "kernel"); 376 printf("\n"); 377 printf(" exception = 0x%x (%s)\n", vector, trapname(vector)); 378 switch (vector) { 379 case EXC_DSE: 380 case EXC_DSI: 381 printf(" virtual address = 0x%" PRIxPTR "\n", 382 frame->cpu.aim.dar); 383 printf(" dsisr = 0x%" PRIxPTR "\n", 384 frame->cpu.aim.dsisr); 385 break; 386 case EXC_ISE: 387 case EXC_ISI: 388 printf(" virtual address = 0x%" PRIxPTR "\n", frame->srr0); 389 break; 390 } 391 printf(" srr0 = 0x%" PRIxPTR "\n", frame->srr0); 392 printf(" srr1 = 0x%" PRIxPTR "\n", frame->srr1); 393 printf(" lr = 0x%" PRIxPTR "\n", frame->lr); 394 printf(" curthread = %p\n", curthread); 395 if (curthread != NULL) 396 printf(" pid = %d, comm = %s\n", 397 curthread->td_proc->p_pid, curthread->td_name); 398 printf("\n"); 399} 400 401/* 402 * Handles a fatal fault when we have onfault state to recover. Returns 403 * non-zero if there was onfault recovery state available. 404 */ 405static int 406handle_onfault(struct trapframe *frame) 407{ 408 struct thread *td; 409 faultbuf *fb; 410 411 td = curthread; 412 fb = td->td_pcb->pcb_onfault; 413 if (fb != NULL) { 414 frame->srr0 = (*fb)[0]; 415 frame->fixreg[1] = (*fb)[1]; 416 frame->fixreg[2] = (*fb)[2]; 417 frame->fixreg[3] = 1; 418 frame->cr = (*fb)[3]; 419 bcopy(&(*fb)[4], &frame->fixreg[13], 420 19 * sizeof(register_t)); 421 return (1); 422 } 423 return (0); 424} 425 426int 427cpu_fetch_syscall_args(struct thread *td, struct syscall_args *sa) 428{ 429 struct proc *p; 430 struct trapframe *frame; 431 caddr_t params; 432 size_t argsz; 433 int error, n, i; 434 435 p = td->td_proc; 436 frame = td->td_frame; 437 438 sa->code = frame->fixreg[0]; 439 params = (caddr_t)(frame->fixreg + FIRSTARG); 440 n = NARGREG; 441 442 if (sa->code == SYS_syscall) { 443 /* 444 * code is first argument, 445 * followed by actual args. 446 */ 447 sa->code = *(register_t *) params; 448 params += sizeof(register_t); 449 n -= 1; 450 } else if (sa->code == SYS___syscall) { 451 /* 452 * Like syscall, but code is a quad, 453 * so as to maintain quad alignment 454 * for the rest of the args. 455 */ 456 if (SV_PROC_FLAG(p, SV_ILP32)) { 457 params += sizeof(register_t); 458 sa->code = *(register_t *) params; 459 params += sizeof(register_t); 460 n -= 2; 461 } else { 462 sa->code = *(register_t *) params; 463 params += sizeof(register_t); 464 n -= 1; 465 } 466 } 467 468 if (p->p_sysent->sv_mask) 469 sa->code &= p->p_sysent->sv_mask; 470 if (sa->code >= p->p_sysent->sv_size) 471 sa->callp = &p->p_sysent->sv_table[0]; 472 else 473 sa->callp = &p->p_sysent->sv_table[sa->code]; 474 475 sa->narg = sa->callp->sy_narg; 476 477 if (SV_PROC_FLAG(p, SV_ILP32)) { 478 argsz = sizeof(uint32_t); 479 480 for (i = 0; i < n; i++) 481 sa->args[i] = ((u_register_t *)(params))[i] & 482 0xffffffff; 483 } else { 484 argsz = sizeof(uint64_t); 485 486 for (i = 0; i < n; i++) 487 sa->args[i] = ((u_register_t *)(params))[i]; 488 } 489 490 if (sa->narg > n) 491 error = copyin(MOREARGS(frame->fixreg[1]), sa->args + n, 492 (sa->narg - n) * argsz); 493 else 494 error = 0; 495 496#ifdef __powerpc64__ 497 if (SV_PROC_FLAG(p, SV_ILP32) && sa->narg > n) { 498 /* Expand the size of arguments copied from the stack */ 499 500 for (i = sa->narg; i >= n; i--) 501 sa->args[i] = ((uint32_t *)(&sa->args[n]))[i-n]; 502 } 503#endif 504 505 if (error == 0) { 506 td->td_retval[0] = 0; 507 td->td_retval[1] = frame->fixreg[FIRSTARG + 1]; 508 } 509 return (error); 510} 511 512#include "../../kern/subr_syscall.c" 513 514void 515syscall(struct trapframe *frame) 516{ 517 struct thread *td; 518 struct syscall_args sa; 519 int error; 520 521 td = curthread; 522 td->td_frame = frame; 523 524#ifdef __powerpc64__ 525 /* 526 * Speculatively restore last user SLB segment, which we know is 527 * invalid already, since we are likely to do copyin()/copyout(). 528 */ 529 __asm __volatile ("slbmte %0, %1; isync" :: 530 "r"(td->td_pcb->pcb_cpu.aim.usr_vsid), "r"(USER_SLB_SLBE)); 531#endif 532 533 error = syscallenter(td, &sa); 534 syscallret(td, error, &sa); 535} 536 537#ifdef __powerpc64__ 538/* Handle kernel SLB faults -- runs in real mode, all seat belts off */ 539void 540handle_kernel_slb_spill(int type, register_t dar, register_t srr0) 541{ 542 struct slb *slbcache; 543 uint64_t slbe, slbv; 544 uint64_t esid, addr; 545 int i; 546 547 addr = (type == EXC_ISE) ? srr0 : dar; 548 slbcache = PCPU_GET(slb); 549 esid = (uintptr_t)addr >> ADDR_SR_SHFT; 550 slbe = (esid << SLBE_ESID_SHIFT) | SLBE_VALID; 551 552 /* See if the hardware flushed this somehow (can happen in LPARs) */ 553 for (i = 0; i < n_slbs; i++) 554 if (slbcache[i].slbe == (slbe | (uint64_t)i)) 555 return; 556 557 /* Not in the map, needs to actually be added */ 558 slbv = kernel_va_to_slbv(addr); 559 if (slbcache[USER_SLB_SLOT].slbe == 0) { 560 for (i = 0; i < n_slbs; i++) { 561 if (i == USER_SLB_SLOT) 562 continue; 563 if (!(slbcache[i].slbe & SLBE_VALID)) 564 goto fillkernslb; 565 } 566 567 if (i == n_slbs) 568 slbcache[USER_SLB_SLOT].slbe = 1; 569 } 570 571 /* Sacrifice a random SLB entry that is not the user entry */ 572 i = mftb() % n_slbs; 573 if (i == USER_SLB_SLOT) 574 i = (i+1) % n_slbs; 575 576fillkernslb: 577 /* Write new entry */ 578 slbcache[i].slbv = slbv; 579 slbcache[i].slbe = slbe | (uint64_t)i; 580 581 /* Trap handler will restore from cache on exit */ 582} 583 584static int 585handle_user_slb_spill(pmap_t pm, vm_offset_t addr) 586{ 587 struct slb *user_entry; 588 uint64_t esid; 589 int i; 590 591 esid = (uintptr_t)addr >> ADDR_SR_SHFT; 592 593 PMAP_LOCK(pm); 594 user_entry = user_va_to_slb_entry(pm, addr); 595 596 if (user_entry == NULL) { 597 /* allocate_vsid auto-spills it */ 598 (void)allocate_user_vsid(pm, esid, 0); 599 } else { 600 /* 601 * Check that another CPU has not already mapped this. 602 * XXX: Per-thread SLB caches would be better. 603 */ 604 for (i = 0; i < pm->pm_slb_len; i++) 605 if (pm->pm_slb[i] == user_entry) 606 break; 607 608 if (i == pm->pm_slb_len) 609 slb_insert_user(pm, user_entry); 610 } 611 PMAP_UNLOCK(pm); 612 613 return (0); 614} 615#endif 616 617static int 618trap_pfault(struct trapframe *frame, int user) 619{ 620 vm_offset_t eva, va; 621 struct thread *td; 622 struct proc *p; 623 vm_map_t map; 624 vm_prot_t ftype; 625 int rv; 626 register_t user_sr; 627 628 td = curthread; 629 p = td->td_proc; 630 if (frame->exc == EXC_ISI) { 631 eva = frame->srr0; 632 ftype = VM_PROT_EXECUTE; 633 if (frame->srr1 & SRR1_ISI_PFAULT) 634 ftype |= VM_PROT_READ; 635 } else { 636 eva = frame->cpu.aim.dar; 637 if (frame->cpu.aim.dsisr & DSISR_STORE) 638 ftype = VM_PROT_WRITE; 639 else 640 ftype = VM_PROT_READ; 641 } 642 643 if (user) { 644 map = &p->p_vmspace->vm_map; 645 } else { 646 if ((eva >> ADDR_SR_SHFT) == (USER_ADDR >> ADDR_SR_SHFT)) { 647 if (p->p_vmspace == NULL) 648 return (SIGSEGV); 649 650 map = &p->p_vmspace->vm_map; 651 652 user_sr = td->td_pcb->pcb_cpu.aim.usr_segm; 653 eva &= ADDR_PIDX | ADDR_POFF; 654 eva |= user_sr << ADDR_SR_SHFT; 655 } else { 656 map = kernel_map; 657 } 658 } 659 va = trunc_page(eva); 660 661 if (map != kernel_map) { 662 /* 663 * Keep swapout from messing with us during this 664 * critical time. 665 */ 666 PROC_LOCK(p); 667 ++p->p_lock; 668 PROC_UNLOCK(p); 669 670 /* Fault in the user page: */ 671 rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL); 672 673 PROC_LOCK(p); 674 --p->p_lock; 675 PROC_UNLOCK(p); 676 /* 677 * XXXDTRACE: add dtrace_doubletrap_func here? 678 */ 679 } else { 680 /* 681 * Don't have to worry about process locking or stacks in the 682 * kernel. 683 */ 684 rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL); 685 } 686 687 if (rv == KERN_SUCCESS) 688 return (0); 689 690 if (!user && handle_onfault(frame)) 691 return (0); 692 693 return (SIGSEGV); 694} 695 696/* 697 * For now, this only deals with the particular unaligned access case 698 * that gcc tends to generate. Eventually it should handle all of the 699 * possibilities that can happen on a 32-bit PowerPC in big-endian mode. 700 */ 701 702static int 703fix_unaligned(struct thread *td, struct trapframe *frame) 704{ 705 struct thread *fputhread; 706 int indicator, reg; 707 double *fpr; 708 709 indicator = EXC_ALI_OPCODE_INDICATOR(frame->cpu.aim.dsisr); 710 711 switch (indicator) { 712 case EXC_ALI_LFD: 713 case EXC_ALI_STFD: 714 reg = EXC_ALI_RST(frame->cpu.aim.dsisr); 715 fpr = &td->td_pcb->pcb_fpu.fpr[reg]; 716 fputhread = PCPU_GET(fputhread); 717 718 /* Juggle the FPU to ensure that we've initialized 719 * the FPRs, and that their current state is in 720 * the PCB. 721 */ 722 if (fputhread != td) { 723 if (fputhread) 724 save_fpu(fputhread); 725 enable_fpu(td); 726 } 727 save_fpu(td); 728 729 if (indicator == EXC_ALI_LFD) { 730 if (copyin((void *)frame->cpu.aim.dar, fpr, 731 sizeof(double)) != 0) 732 return -1; 733 enable_fpu(td); 734 } else { 735 if (copyout(fpr, (void *)frame->cpu.aim.dar, 736 sizeof(double)) != 0) 737 return -1; 738 } 739 return 0; 740 break; 741 } 742 743 return -1; 744} 745 746