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("$FreeBSD$"); 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/kernel.h> 50 #include <sys/uio.h> 51 #include <sys/signalvar.h> 52 #include <sys/vmmeter.h> 53 54 #include <security/audit/audit.h> 55 56 #include <vm/vm.h> 57 #include <vm/pmap.h> 58 #include <vm/vm_extern.h> 59 #include <vm/vm_param.h> 60 #include <vm/vm_kern.h> 61 #include <vm/vm_map.h> 62 #include <vm/vm_page.h> 63 64 #include <machine/_inttypes.h> 65 #include <machine/altivec.h> 66 #include <machine/cpu.h> 67 #include <machine/db_machdep.h> 68 #include <machine/fpu.h> 69 #include <machine/frame.h> 70 #include <machine/pcb.h> 71 #include <machine/pmap.h> 72 #include <machine/psl.h> 73 #include <machine/trap.h> 74 #include <machine/spr.h> 75 #include <machine/sr.h> 76 77 #define FAULTBUF_LR 0 78 #define FAULTBUF_R1 1 79 #define FAULTBUF_R2 2 80 #define FAULTBUF_CR 3 81 #define FAULTBUF_R13 4 82 83 static void trap_fatal(struct trapframe *frame); 84 static void printtrap(u_int vector, struct trapframe *frame, int isfatal, 85 int user); 86 static int trap_pfault(struct trapframe *frame, int user); 87 static int fix_unaligned(struct thread *td, struct trapframe *frame); 88 static int handle_onfault(struct trapframe *frame); 89 static void syscall(struct trapframe *frame); 90 91 #ifdef __powerpc64__ 92 void handle_kernel_slb_spill(int, register_t, register_t); 93 static int handle_user_slb_spill(pmap_t pm, vm_offset_t addr); 94 extern int n_slbs; 95 #endif 96 97 struct powerpc_exception { 98 u_int vector; 99 char *name; 100 }; 101 102 #ifdef KDTRACE_HOOKS 103 #include <sys/dtrace_bsd.h> 104 105 int (*dtrace_invop_jump_addr)(struct trapframe *); 106 #endif 107 108 static struct powerpc_exception powerpc_exceptions[] = { 109 { EXC_CRIT, "critical input" }, 110 { EXC_RST, "system reset" }, 111 { EXC_MCHK, "machine check" }, 112 { EXC_DSI, "data storage interrupt" }, 113 { EXC_DSE, "data segment exception" }, 114 { EXC_ISI, "instruction storage interrupt" }, 115 { EXC_ISE, "instruction segment exception" }, 116 { EXC_EXI, "external interrupt" }, 117 { EXC_ALI, "alignment" }, 118 { EXC_PGM, "program" }, 119 { EXC_FPU, "floating-point unavailable" }, 120 { EXC_APU, "auxiliary proc unavailable" }, 121 { EXC_DECR, "decrementer" }, 122 { EXC_FIT, "fixed-interval timer" }, 123 { EXC_WDOG, "watchdog timer" }, 124 { EXC_SC, "system call" }, 125 { EXC_TRC, "trace" }, 126 { EXC_FPA, "floating-point assist" }, 127 { EXC_DEBUG, "debug" }, 128 { EXC_PERF, "performance monitoring" }, 129 { EXC_VEC, "altivec unavailable" }, 130 { EXC_VSX, "vsx unavailable" }, 131 { EXC_ITMISS, "instruction tlb miss" }, 132 { EXC_DLMISS, "data load tlb miss" }, 133 { EXC_DSMISS, "data store tlb miss" }, 134 { EXC_BPT, "instruction breakpoint" }, 135 { EXC_SMI, "system management" }, 136 { EXC_VECAST_G4, "altivec assist" }, 137 { EXC_THRM, "thermal management" }, 138 { EXC_RUNMODETRC, "run mode/trace" }, 139 { EXC_LAST, NULL } 140 }; 141 142 static const char * 143 trapname(u_int vector) 144 { 145 struct powerpc_exception *pe; 146 147 for (pe = powerpc_exceptions; pe->vector != EXC_LAST; pe++) { 148 if (pe->vector == vector) 149 return (pe->name); 150 } 151 152 return ("unknown"); 153 } 154 155 void 156 trap(struct trapframe *frame) 157 { 158 struct thread *td; 159 struct proc *p; 160 #ifdef KDTRACE_HOOKS 161 uint32_t inst; 162 #endif 163 int sig, type, user; 164 u_int ucode; 165 ksiginfo_t ksi; 166 167 PCPU_INC(cnt.v_trap); 168 169 td = curthread; 170 p = td->td_proc; 171 172 type = ucode = frame->exc; 173 sig = 0; 174 user = frame->srr1 & PSL_PR; 175 176 CTR3(KTR_TRAP, "trap: %s type=%s (%s)", td->td_name, 177 trapname(type), user ? "user" : "kernel"); 178 179 #ifdef KDTRACE_HOOKS 180 /* 181 * A trap can occur while DTrace executes a probe. Before 182 * executing the probe, DTrace blocks re-scheduling and sets 183 * a flag in its per-cpu flags to indicate that it doesn't 184 * want to fault. On returning from the probe, the no-fault 185 * flag is cleared and finally re-scheduling is enabled. 186 * 187 * If the DTrace kernel module has registered a trap handler, 188 * call it and if it returns non-zero, assume that it has 189 * handled the trap and modified the trap frame so that this 190 * function can return normally. 191 */ 192 if (dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, type) != 0) 193 return; 194 #endif 195 196 if (user) { 197 td->td_pticks = 0; 198 td->td_frame = frame; 199 if (td->td_ucred != p->p_ucred) 200 cred_update_thread(td); 201 202 /* User Mode Traps */ 203 switch (type) { 204 case EXC_RUNMODETRC: 205 case EXC_TRC: 206 frame->srr1 &= ~PSL_SE; 207 sig = SIGTRAP; 208 ucode = TRAP_TRACE; 209 break; 210 211 #ifdef __powerpc64__ 212 case EXC_ISE: 213 case EXC_DSE: 214 if (handle_user_slb_spill(&p->p_vmspace->vm_pmap, 215 (type == EXC_ISE) ? frame->srr0 : frame->dar) != 0){ 216 sig = SIGSEGV; 217 ucode = SEGV_MAPERR; 218 } 219 break; 220 #endif 221 case EXC_DSI: 222 case EXC_ISI: 223 sig = trap_pfault(frame, 1); 224 if (sig == SIGSEGV) 225 ucode = SEGV_MAPERR; 226 break; 227 228 case EXC_SC: 229 syscall(frame); 230 break; 231 232 case EXC_FPU: 233 KASSERT((td->td_pcb->pcb_flags & PCB_FPU) != PCB_FPU, 234 ("FPU already enabled for thread")); 235 enable_fpu(td); 236 break; 237 238 case EXC_VEC: 239 KASSERT((td->td_pcb->pcb_flags & PCB_VEC) != PCB_VEC, 240 ("Altivec already enabled for thread")); 241 enable_vec(td); 242 break; 243 244 case EXC_VSX: 245 KASSERT((td->td_pcb->pcb_flags & PCB_VSX) != PCB_VSX, 246 ("VSX already enabled for thread")); 247 if (!(td->td_pcb->pcb_flags & PCB_VEC)) 248 enable_vec(td); 249 if (!(td->td_pcb->pcb_flags & PCB_FPU)) 250 save_fpu(td); 251 td->td_pcb->pcb_flags |= PCB_VSX; 252 enable_fpu(td); 253 break; 254 255 case EXC_VECAST_G4: 256 case EXC_VECAST_G5: 257 /* 258 * We get a VPU assist exception for IEEE mode 259 * vector operations on denormalized floats. 260 * Emulating this is a giant pain, so for now, 261 * just switch off IEEE mode and treat them as 262 * zero. 263 */ 264 265 save_vec(td); 266 td->td_pcb->pcb_vec.vscr |= ALTIVEC_VSCR_NJ; 267 enable_vec(td); 268 break; 269 270 case EXC_ALI: 271 if (fix_unaligned(td, frame) != 0) { 272 sig = SIGBUS; 273 ucode = BUS_ADRALN; 274 } 275 else 276 frame->srr0 += 4; 277 break; 278 279 case EXC_DEBUG: /* Single stepping */ 280 mtspr(SPR_DBSR, mfspr(SPR_DBSR)); 281 frame->srr1 &= ~PSL_DE; 282 frame->cpu.booke.dbcr0 &= ~(DBCR0_IDM || DBCR0_IC); 283 sig = SIGTRAP; 284 ucode = TRAP_TRACE; 285 break; 286 287 case EXC_PGM: 288 /* Identify the trap reason */ 289 #ifdef AIM 290 if (frame->srr1 & EXC_PGM_TRAP) { 291 #else 292 if (frame->cpu.booke.esr & ESR_PTR) { 293 #endif 294 #ifdef KDTRACE_HOOKS 295 inst = fuword32((const void *)frame->srr0); 296 if (inst == 0x0FFFDDDD && 297 dtrace_pid_probe_ptr != NULL) { 298 struct reg regs; 299 fill_regs(td, ®s); 300 (*dtrace_pid_probe_ptr)(®s); 301 break; 302 } 303 #endif 304 sig = SIGTRAP; 305 ucode = TRAP_BRKPT; 306 } else { 307 sig = ppc_instr_emulate(frame, td->td_pcb); 308 if (sig == SIGILL) { 309 if (frame->srr1 & EXC_PGM_PRIV) 310 ucode = ILL_PRVOPC; 311 else if (frame->srr1 & EXC_PGM_ILLEGAL) 312 ucode = ILL_ILLOPC; 313 } else if (sig == SIGFPE) 314 ucode = FPE_FLTINV; /* Punt for now, invalid operation. */ 315 } 316 break; 317 318 case EXC_MCHK: 319 /* 320 * Note that this may not be recoverable for the user 321 * process, depending on the type of machine check, 322 * but it at least prevents the kernel from dying. 323 */ 324 sig = SIGBUS; 325 ucode = BUS_OBJERR; 326 break; 327 328 default: 329 trap_fatal(frame); 330 } 331 } else { 332 /* Kernel Mode Traps */ 333 334 KASSERT(cold || td->td_ucred != NULL, 335 ("kernel trap doesn't have ucred")); 336 switch (type) { 337 #ifdef KDTRACE_HOOKS 338 case EXC_PGM: 339 if (frame->srr1 & EXC_PGM_TRAP) { 340 if (*(uint32_t *)frame->srr0 == EXC_DTRACE) { 341 if (dtrace_invop_jump_addr != NULL) { 342 dtrace_invop_jump_addr(frame); 343 return; 344 } 345 } 346 } 347 break; 348 #endif 349 #ifdef __powerpc64__ 350 case EXC_DSE: 351 if ((frame->dar & SEGMENT_MASK) == USER_ADDR) { 352 __asm __volatile ("slbmte %0, %1" :: 353 "r"(td->td_pcb->pcb_cpu.aim.usr_vsid), 354 "r"(USER_SLB_SLBE)); 355 return; 356 } 357 break; 358 #endif 359 case EXC_DSI: 360 if (trap_pfault(frame, 0) == 0) 361 return; 362 break; 363 case EXC_MCHK: 364 if (handle_onfault(frame)) 365 return; 366 break; 367 default: 368 break; 369 } 370 trap_fatal(frame); 371 } 372 373 if (sig != 0) { 374 if (p->p_sysent->sv_transtrap != NULL) 375 sig = (p->p_sysent->sv_transtrap)(sig, type); 376 ksiginfo_init_trap(&ksi); 377 ksi.ksi_signo = sig; 378 ksi.ksi_code = (int) ucode; /* XXX, not POSIX */ 379 /* ksi.ksi_addr = ? */ 380 ksi.ksi_trapno = type; 381 trapsignal(td, &ksi); 382 } 383 384 userret(td, frame); 385 } 386 387 static void 388 trap_fatal(struct trapframe *frame) 389 { 390 391 printtrap(frame->exc, frame, 1, (frame->srr1 & PSL_PR)); 392 #ifdef KDB 393 if ((debugger_on_panic || kdb_active) && 394 kdb_trap(frame->exc, 0, frame)) 395 return; 396 #endif 397 panic("%s trap", trapname(frame->exc)); 398 } 399 400 static void 401 printtrap(u_int vector, struct trapframe *frame, int isfatal, int user) 402 { 403 404 printf("\n"); 405 printf("%s %s trap:\n", isfatal ? "fatal" : "handled", 406 user ? "user" : "kernel"); 407 printf("\n"); 408 printf(" exception = 0x%x (%s)\n", vector, trapname(vector)); 409 switch (vector) { 410 case EXC_DSE: 411 case EXC_DSI: 412 case EXC_DTMISS: 413 printf(" virtual address = 0x%" PRIxPTR "\n", frame->dar); 414 #ifdef AIM 415 printf(" dsisr = 0x%" PRIxPTR "\n", 416 frame->cpu.aim.dsisr); 417 #endif 418 break; 419 case EXC_ISE: 420 case EXC_ISI: 421 case EXC_ITMISS: 422 printf(" virtual address = 0x%" PRIxPTR "\n", frame->srr0); 423 break; 424 } 425 #ifdef BOOKE 426 printf(" esr = 0x%" PRIxPTR "\n", 427 frame->cpu.booke.esr); 428 #endif 429 printf(" srr0 = 0x%" PRIxPTR "\n", frame->srr0); 430 printf(" srr1 = 0x%" PRIxPTR "\n", frame->srr1); 431 printf(" lr = 0x%" PRIxPTR "\n", frame->lr); 432 printf(" curthread = %p\n", curthread); 433 if (curthread != NULL) 434 printf(" pid = %d, comm = %s\n", 435 curthread->td_proc->p_pid, curthread->td_name); 436 printf("\n"); 437 } 438 439 /* 440 * Handles a fatal fault when we have onfault state to recover. Returns 441 * non-zero if there was onfault recovery state available. 442 */ 443 static int 444 handle_onfault(struct trapframe *frame) 445 { 446 struct thread *td; 447 faultbuf *fb; 448 449 td = curthread; 450 fb = td->td_pcb->pcb_onfault; 451 if (fb != NULL) { 452 frame->srr0 = (*fb)[FAULTBUF_LR]; 453 frame->fixreg[1] = (*fb)[FAULTBUF_R1]; 454 frame->fixreg[2] = (*fb)[FAULTBUF_R2]; 455 frame->fixreg[3] = 1; 456 frame->cr = (*fb)[FAULTBUF_CR]; 457 bcopy(&(*fb)[FAULTBUF_R13], &frame->fixreg[13], 458 19 * sizeof(register_t)); 459 return (1); 460 } 461 return (0); 462 } 463 464 int 465 cpu_fetch_syscall_args(struct thread *td, struct syscall_args *sa) 466 { 467 struct proc *p; 468 struct trapframe *frame; 469 caddr_t params; 470 size_t argsz; 471 int error, n, i; 472 473 p = td->td_proc; 474 frame = td->td_frame; 475 476 sa->code = frame->fixreg[0]; 477 params = (caddr_t)(frame->fixreg + FIRSTARG); 478 n = NARGREG; 479 480 if (sa->code == SYS_syscall) { 481 /* 482 * code is first argument, 483 * followed by actual args. 484 */ 485 sa->code = *(register_t *) params; 486 params += sizeof(register_t); 487 n -= 1; 488 } else if (sa->code == SYS___syscall) { 489 /* 490 * Like syscall, but code is a quad, 491 * so as to maintain quad alignment 492 * for the rest of the args. 493 */ 494 if (SV_PROC_FLAG(p, SV_ILP32)) { 495 params += sizeof(register_t); 496 sa->code = *(register_t *) params; 497 params += sizeof(register_t); 498 n -= 2; 499 } else { 500 sa->code = *(register_t *) params; 501 params += sizeof(register_t); 502 n -= 1; 503 } 504 } 505 506 if (p->p_sysent->sv_mask) 507 sa->code &= p->p_sysent->sv_mask; 508 if (sa->code >= p->p_sysent->sv_size) 509 sa->callp = &p->p_sysent->sv_table[0]; 510 else 511 sa->callp = &p->p_sysent->sv_table[sa->code]; 512 513 sa->narg = sa->callp->sy_narg; 514 515 if (SV_PROC_FLAG(p, SV_ILP32)) { 516 argsz = sizeof(uint32_t); 517 518 for (i = 0; i < n; i++) 519 sa->args[i] = ((u_register_t *)(params))[i] & 520 0xffffffff; 521 } else { 522 argsz = sizeof(uint64_t); 523 524 for (i = 0; i < n; i++) 525 sa->args[i] = ((u_register_t *)(params))[i]; 526 } 527 528 if (sa->narg > n) 529 error = copyin(MOREARGS(frame->fixreg[1]), sa->args + n, 530 (sa->narg - n) * argsz); 531 else 532 error = 0; 533 534 #ifdef __powerpc64__ 535 if (SV_PROC_FLAG(p, SV_ILP32) && sa->narg > n) { 536 /* Expand the size of arguments copied from the stack */ 537 538 for (i = sa->narg; i >= n; i--) 539 sa->args[i] = ((uint32_t *)(&sa->args[n]))[i-n]; 540 } 541 #endif 542 543 if (error == 0) { 544 td->td_retval[0] = 0; 545 td->td_retval[1] = frame->fixreg[FIRSTARG + 1]; 546 } 547 return (error); 548 } 549 550 #include "../../kern/subr_syscall.c" 551 552 void 553 syscall(struct trapframe *frame) 554 { 555 struct thread *td; 556 struct syscall_args sa; 557 int error; 558 559 td = curthread; 560 td->td_frame = frame; 561 562 #ifdef __powerpc64__ 563 /* 564 * Speculatively restore last user SLB segment, which we know is 565 * invalid already, since we are likely to do copyin()/copyout(). 566 */ 567 __asm __volatile ("slbmte %0, %1; isync" :: 568 "r"(td->td_pcb->pcb_cpu.aim.usr_vsid), "r"(USER_SLB_SLBE)); 569 #endif 570 571 error = syscallenter(td, &sa); 572 syscallret(td, error, &sa); 573 } 574 575 #ifdef __powerpc64__ 576 /* Handle kernel SLB faults -- runs in real mode, all seat belts off */ 577 void 578 handle_kernel_slb_spill(int type, register_t dar, register_t srr0) 579 { 580 struct slb *slbcache; 581 uint64_t slbe, slbv; 582 uint64_t esid, addr; 583 int i; 584 585 addr = (type == EXC_ISE) ? srr0 : dar; 586 slbcache = PCPU_GET(slb); 587 esid = (uintptr_t)addr >> ADDR_SR_SHFT; 588 slbe = (esid << SLBE_ESID_SHIFT) | SLBE_VALID; 589 590 /* See if the hardware flushed this somehow (can happen in LPARs) */ 591 for (i = 0; i < n_slbs; i++) 592 if (slbcache[i].slbe == (slbe | (uint64_t)i)) 593 return; 594 595 /* Not in the map, needs to actually be added */ 596 slbv = kernel_va_to_slbv(addr); 597 if (slbcache[USER_SLB_SLOT].slbe == 0) { 598 for (i = 0; i < n_slbs; i++) { 599 if (i == USER_SLB_SLOT) 600 continue; 601 if (!(slbcache[i].slbe & SLBE_VALID)) 602 goto fillkernslb; 603 } 604 605 if (i == n_slbs) 606 slbcache[USER_SLB_SLOT].slbe = 1; 607 } 608 609 /* Sacrifice a random SLB entry that is not the user entry */ 610 i = mftb() % n_slbs; 611 if (i == USER_SLB_SLOT) 612 i = (i+1) % n_slbs; 613 614 fillkernslb: 615 /* Write new entry */ 616 slbcache[i].slbv = slbv; 617 slbcache[i].slbe = slbe | (uint64_t)i; 618 619 /* Trap handler will restore from cache on exit */ 620 } 621 622 static int 623 handle_user_slb_spill(pmap_t pm, vm_offset_t addr) 624 { 625 struct slb *user_entry; 626 uint64_t esid; 627 int i; 628 629 esid = (uintptr_t)addr >> ADDR_SR_SHFT; 630 631 PMAP_LOCK(pm); 632 user_entry = user_va_to_slb_entry(pm, addr); 633 634 if (user_entry == NULL) { 635 /* allocate_vsid auto-spills it */ 636 (void)allocate_user_vsid(pm, esid, 0); 637 } else { 638 /* 639 * Check that another CPU has not already mapped this. 640 * XXX: Per-thread SLB caches would be better. 641 */ 642 for (i = 0; i < pm->pm_slb_len; i++) 643 if (pm->pm_slb[i] == user_entry) 644 break; 645 646 if (i == pm->pm_slb_len) 647 slb_insert_user(pm, user_entry); 648 } 649 PMAP_UNLOCK(pm); 650 651 return (0); 652 } 653 #endif 654 655 static int 656 trap_pfault(struct trapframe *frame, int user) 657 { 658 vm_offset_t eva, va; 659 struct thread *td; 660 struct proc *p; 661 vm_map_t map; 662 vm_prot_t ftype; 663 int rv; 664 #ifdef AIM 665 register_t user_sr; 666 #endif 667 668 td = curthread; 669 p = td->td_proc; 670 if (frame->exc == EXC_ISI) { 671 eva = frame->srr0; 672 ftype = VM_PROT_EXECUTE; 673 if (frame->srr1 & SRR1_ISI_PFAULT) 674 ftype |= VM_PROT_READ; 675 } else { 676 eva = frame->dar; 677 #ifdef BOOKE 678 if (frame->cpu.booke.esr & ESR_ST) 679 #else 680 if (frame->cpu.aim.dsisr & DSISR_STORE) 681 #endif 682 ftype = VM_PROT_WRITE; 683 else 684 ftype = VM_PROT_READ; 685 } 686 687 if (user) { 688 KASSERT(p->p_vmspace != NULL, ("trap_pfault: vmspace NULL")); 689 map = &p->p_vmspace->vm_map; 690 } else { 691 #ifdef BOOKE 692 if (eva < VM_MAXUSER_ADDRESS) { 693 #else 694 if ((eva >> ADDR_SR_SHFT) == (USER_ADDR >> ADDR_SR_SHFT)) { 695 #endif 696 if (p->p_vmspace == NULL) 697 return (SIGSEGV); 698 699 map = &p->p_vmspace->vm_map; 700 701 #ifdef AIM 702 user_sr = td->td_pcb->pcb_cpu.aim.usr_segm; 703 eva &= ADDR_PIDX | ADDR_POFF; 704 eva |= user_sr << ADDR_SR_SHFT; 705 #endif 706 } else { 707 map = kernel_map; 708 } 709 } 710 va = trunc_page(eva); 711 712 if (map != kernel_map) { 713 /* 714 * Keep swapout from messing with us during this 715 * critical time. 716 */ 717 PROC_LOCK(p); 718 ++p->p_lock; 719 PROC_UNLOCK(p); 720 721 /* Fault in the user page: */ 722 rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL); 723 724 PROC_LOCK(p); 725 --p->p_lock; 726 PROC_UNLOCK(p); 727 /* 728 * XXXDTRACE: add dtrace_doubletrap_func here? 729 */ 730 } else { 731 /* 732 * Don't have to worry about process locking or stacks in the 733 * kernel. 734 */ 735 rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL); 736 } 737 738 if (rv == KERN_SUCCESS) 739 return (0); 740 741 if (!user && handle_onfault(frame)) 742 return (0); 743 744 return (SIGSEGV); 745 } 746 747 /* 748 * For now, this only deals with the particular unaligned access case 749 * that gcc tends to generate. Eventually it should handle all of the 750 * possibilities that can happen on a 32-bit PowerPC in big-endian mode. 751 */ 752 753 static int 754 fix_unaligned(struct thread *td, struct trapframe *frame) 755 { 756 struct thread *fputhread; 757 int indicator, reg; 758 double *fpr; 759 760 indicator = EXC_ALI_OPCODE_INDICATOR(frame->cpu.aim.dsisr); 761 762 switch (indicator) { 763 case EXC_ALI_LFD: 764 case EXC_ALI_STFD: 765 reg = EXC_ALI_RST(frame->cpu.aim.dsisr); 766 fpr = &td->td_pcb->pcb_fpu.fpr[reg].fpr; 767 fputhread = PCPU_GET(fputhread); 768 769 /* Juggle the FPU to ensure that we've initialized 770 * the FPRs, and that their current state is in 771 * the PCB. 772 */ 773 if (fputhread != td) { 774 if (fputhread) 775 save_fpu(fputhread); 776 enable_fpu(td); 777 } 778 save_fpu(td); 779 780 if (indicator == EXC_ALI_LFD) { 781 if (copyin((void *)frame->dar, fpr, 782 sizeof(double)) != 0) 783 return (-1); 784 enable_fpu(td); 785 } else { 786 if (copyout(fpr, (void *)frame->dar, 787 sizeof(double)) != 0) 788 return (-1); 789 } 790 return (0); 791 break; 792 } 793 794 return (-1); 795 } 796 797 #ifdef KDB 798 int db_trap_glue(struct trapframe *); /* Called from trap_subr.S */ 799 800 int 801 db_trap_glue(struct trapframe *frame) 802 { 803 if (!(frame->srr1 & PSL_PR) 804 && (frame->exc == EXC_TRC || frame->exc == EXC_RUNMODETRC 805 #ifdef AIM 806 || (frame->exc == EXC_PGM 807 && (frame->srr1 & 0x20000)) 808 #else 809 || (frame->exc == EXC_DEBUG) 810 #endif 811 || frame->exc == EXC_BPT 812 || frame->exc == EXC_DSI)) { 813 int type = frame->exc; 814 815 /* Ignore DTrace traps. */ 816 if (*(uint32_t *)frame->srr0 == EXC_DTRACE) 817 return (0); 818 #ifdef AIM 819 if (type == EXC_PGM && (frame->srr1 & 0x20000)) { 820 #else 821 if (frame->cpu.booke.esr & ESR_PTR) { 822 #endif 823 type = T_BREAKPOINT; 824 } 825 return (kdb_trap(type, 0, frame)); 826 } 827 828 return (0); 829 } 830 #endif 831