Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powerpc/trap.c
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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: releng/6.1/sys/powerpc/powerpc/trap.c 148846 2005-08-08 07:02:12Z grehan $"); 36 37 #include "opt_ktrace.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/reboot.h> 47 #include <sys/syscall.h> 48 #include <sys/sysent.h> 49 #include <sys/systm.h> 50 #include <sys/uio.h> 51 #include <sys/signalvar.h> 52 #ifdef KTRACE 53 #include <sys/ktrace.h> 54 #endif 55 #include <sys/vmmeter.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/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 76 void trap(struct trapframe *); 77 78 static void trap_fatal(struct trapframe *frame); 79 static void printtrap(u_int vector, struct trapframe *frame, int isfatal, 80 int user); 81 static int trap_pfault(struct trapframe *frame, int user); 82 static int fix_unaligned(struct thread *td, struct trapframe *frame); 83 static int handle_onfault(struct trapframe *frame); 84 static void syscall(struct trapframe *frame); 85 86 static __inline void setusr(u_int); 87 88 int setfault(faultbuf); /* defined in locore.S */ 89 90 /* Why are these not defined in a header? */ 91 int badaddr(void *, size_t); 92 int badaddr_read(void *, size_t, int *); 93 94 extern char *syscallnames[]; 95 96 struct powerpc_exception { 97 u_int vector; 98 char *name; 99 }; 100 101 static struct powerpc_exception powerpc_exceptions[] = { 102 { 0x0100, "system reset" }, 103 { 0x0200, "machine check" }, 104 { 0x0300, "data storage interrupt" }, 105 { 0x0400, "instruction storage interrupt" }, 106 { 0x0500, "external interrupt" }, 107 { 0x0600, "alignment" }, 108 { 0x0700, "program" }, 109 { 0x0800, "floating-point unavailable" }, 110 { 0x0900, "decrementer" }, 111 { 0x0c00, "system call" }, 112 { 0x0d00, "trace" }, 113 { 0x0e00, "floating-point assist" }, 114 { 0x0f00, "performance monitoring" }, 115 { 0x0f20, "altivec unavailable" }, 116 { 0x1000, "instruction tlb miss" }, 117 { 0x1100, "data load tlb miss" }, 118 { 0x1200, "data store tlb miss" }, 119 { 0x1300, "instruction breakpoint" }, 120 { 0x1400, "system management" }, 121 { 0x1600, "altivec assist" }, 122 { 0x1700, "thermal management" }, 123 { 0x2000, "run mode/trace" }, 124 { 0x3000, NULL } 125 }; 126 127 static const char * 128 trapname(u_int vector) 129 { 130 struct powerpc_exception *pe; 131 132 for (pe = powerpc_exceptions; pe->vector != 0x3000; pe++) { 133 if (pe->vector == vector) 134 return (pe->name); 135 } 136 137 return ("unknown"); 138 } 139 140 void 141 trap(struct trapframe *frame) 142 { 143 struct thread *td; 144 struct proc *p; 145 int sig, type, user; 146 u_int sticks, ucode; 147 148 PCPU_LAZY_INC(cnt.v_trap); 149 150 td = PCPU_GET(curthread); 151 p = td->td_proc; 152 153 type = ucode = frame->exc; 154 sig = 0; 155 user = frame->srr1 & PSL_PR; 156 sticks = 0; 157 158 CTR3(KTR_TRAP, "trap: %s type=%s (%s)", p->p_comm, 159 trapname(type), user ? "user" : "kernel"); 160 161 if (user) { 162 sticks = td->td_sticks; 163 td->td_frame = frame; 164 if (td->td_ucred != p->p_ucred) 165 cred_update_thread(td); 166 167 /* User Mode Traps */ 168 switch (type) { 169 case EXC_RUNMODETRC: 170 case EXC_TRC: 171 frame->srr1 &= ~PSL_SE; 172 sig = SIGTRAP; 173 break; 174 175 case EXC_DSI: 176 case EXC_ISI: 177 sig = trap_pfault(frame, 1); 178 break; 179 180 case EXC_SC: 181 syscall(frame); 182 break; 183 184 case EXC_FPU: 185 KASSERT((td->td_pcb->pcb_flags & PCB_FPU) != PCB_FPU, 186 ("FPU already enabled for thread")); 187 enable_fpu(td); 188 break; 189 190 #ifdef ALTIVEC 191 case EXC_VEC: 192 if ((vecthread = PCPU_GET(vecthread)) != NULL) { 193 KASSERT(vecthread != td, 194 ("altivec already enabled")); 195 save_vec(vecthread); 196 } 197 PCPU_SET(vecthread, td); 198 td->td_pcb->pcb_veccpu = PCPU_GET(cpuid); 199 enable_vec(td); 200 frame->srr1 |= PSL_VEC; 201 break; 202 #else 203 case EXC_VEC: 204 case EXC_VECAST: 205 sig = SIGILL; 206 break; 207 #endif /* ALTIVEC */ 208 209 case EXC_ALI: 210 if (fix_unaligned(td, frame) != 0) 211 sig = SIGBUS; 212 else 213 frame->srr0 += 4; 214 break; 215 216 case EXC_PGM: 217 /* XXX temporarily */ 218 /* XXX: Magic Number? */ 219 if (frame->srr1 & 0x0002000) 220 sig = SIGTRAP; 221 else 222 sig = SIGILL; 223 break; 224 225 default: 226 trap_fatal(frame); 227 } 228 } else { 229 /* Kernel Mode Traps */ 230 231 KASSERT(cold || td->td_ucred != NULL, 232 ("kernel trap doesn't have ucred")); 233 switch (type) { 234 case EXC_DSI: 235 if (trap_pfault(frame, 0) == 0) 236 return; 237 break; 238 case EXC_MCHK: 239 if (handle_onfault(frame)) 240 return; 241 break; 242 default: 243 break; 244 } 245 trap_fatal(frame); 246 } 247 248 #ifdef ALTIVEC 249 if (td != PCPU_GET(vecthread) || 250 td->td_pcb->pcb_veccpu != PCPU_GET(cpuid)) 251 frame->srr1 &= ~PSL_VEC; 252 #endif /* ALTIVEC */ 253 254 if (sig != 0) { 255 if (p->p_sysent->sv_transtrap != NULL) 256 sig = (p->p_sysent->sv_transtrap)(sig, type); 257 trapsignal(td, sig, ucode); 258 } 259 260 userret(td, frame, sticks); 261 mtx_assert(&Giant, MA_NOTOWNED); 262 } 263 264 static void 265 trap_fatal(struct trapframe *frame) 266 { 267 268 printtrap(frame->exc, frame, 1, (frame->srr1 & PSL_PR)); 269 #ifdef KDB 270 if ((debugger_on_panic || kdb_active) && 271 kdb_trap(frame->exc, 0, frame)) 272 return; 273 #endif 274 panic("%s trap", trapname(frame->exc)); 275 } 276 277 static void 278 printtrap(u_int vector, struct trapframe *frame, int isfatal, int user) 279 { 280 281 printf("\n"); 282 printf("%s %s trap:\n", isfatal ? "fatal" : "handled", 283 user ? "user" : "kernel"); 284 printf("\n"); 285 printf(" exception = 0x%x (%s)\n", vector >> 8, 286 trapname(vector)); 287 switch (vector) { 288 case EXC_DSI: 289 printf(" virtual address = 0x%x\n", frame->dar); 290 break; 291 case EXC_ISI: 292 printf(" virtual address = 0x%x\n", frame->srr0); 293 break; 294 } 295 printf(" srr0 = 0x%x\n", frame->srr0); 296 printf(" srr1 = 0x%x\n", frame->srr1); 297 printf(" curthread = %p\n", curthread); 298 if (curthread != NULL) 299 printf(" pid = %d, comm = %s\n", 300 curthread->td_proc->p_pid, curthread->td_proc->p_comm); 301 printf("\n"); 302 } 303 304 /* 305 * Handles a fatal fault when we have onfault state to recover. Returns 306 * non-zero if there was onfault recovery state available. 307 */ 308 static int 309 handle_onfault(struct trapframe *frame) 310 { 311 struct thread *td; 312 faultbuf *fb; 313 314 td = curthread; 315 fb = td->td_pcb->pcb_onfault; 316 if (fb != NULL) { 317 frame->srr0 = (*fb)[0]; 318 frame->fixreg[1] = (*fb)[1]; 319 frame->fixreg[2] = (*fb)[2]; 320 frame->fixreg[3] = 1; 321 frame->cr = (*fb)[3]; 322 bcopy(&(*fb)[4], &frame->fixreg[13], 323 19 * sizeof(register_t)); 324 return (1); 325 } 326 return (0); 327 } 328 329 void 330 syscall(struct trapframe *frame) 331 { 332 caddr_t params; 333 struct sysent *callp; 334 struct thread *td; 335 struct proc *p; 336 int error, n; 337 size_t narg; 338 register_t args[10]; 339 u_int code; 340 341 td = PCPU_GET(curthread); 342 p = td->td_proc; 343 344 PCPU_LAZY_INC(cnt.v_syscall); 345 346 if (p->p_flag & P_SA) 347 thread_user_enter(td); 348 349 code = frame->fixreg[0]; 350 params = (caddr_t)(frame->fixreg + FIRSTARG); 351 n = NARGREG; 352 353 if (p->p_sysent->sv_prepsyscall) { 354 /* 355 * The prep code is MP aware. 356 */ 357 (*p->p_sysent->sv_prepsyscall)(frame, args, &code, ¶ms); 358 } else if (code == SYS_syscall) { 359 /* 360 * code is first argument, 361 * followed by actual args. 362 */ 363 code = *(u_int *) params; 364 params += sizeof(register_t); 365 n -= 1; 366 } else if (code == SYS___syscall) { 367 /* 368 * Like syscall, but code is a quad, 369 * so as to maintain quad alignment 370 * for the rest of the args. 371 */ 372 params += sizeof(register_t); 373 code = *(u_int *) params; 374 params += sizeof(register_t); 375 n -= 2; 376 } 377 378 if (p->p_sysent->sv_mask) 379 code &= p->p_sysent->sv_mask; 380 381 if (code >= p->p_sysent->sv_size) 382 callp = &p->p_sysent->sv_table[0]; 383 else 384 callp = &p->p_sysent->sv_table[code]; 385 386 narg = callp->sy_narg & SYF_ARGMASK; 387 388 if (narg > n) { 389 bcopy(params, args, n * sizeof(register_t)); 390 error = copyin(MOREARGS(frame->fixreg[1]), args + n, 391 (narg - n) * sizeof(register_t)); 392 params = (caddr_t)args; 393 } else 394 error = 0; 395 396 CTR5(KTR_SYSC, "syscall: p=%s %s(%x %x %x)", p->p_comm, 397 syscallnames[code], 398 frame->fixreg[FIRSTARG], 399 frame->fixreg[FIRSTARG+1], 400 frame->fixreg[FIRSTARG+2]); 401 402 #ifdef KTRACE 403 if (KTRPOINT(td, KTR_SYSCALL)) 404 ktrsyscall(code, narg, (register_t *)params); 405 #endif 406 /* 407 * Try to run the syscall without Giant if the syscall is MP safe. 408 */ 409 if ((callp->sy_narg & SYF_MPSAFE) == 0) 410 mtx_lock(&Giant); 411 412 if (error == 0) { 413 td->td_retval[0] = 0; 414 td->td_retval[1] = frame->fixreg[FIRSTARG + 1]; 415 416 STOPEVENT(p, S_SCE, narg); 417 418 error = (*callp->sy_call)(td, params); 419 420 CTR3(KTR_SYSC, "syscall: p=%s %s ret=%x", p->p_comm, 421 syscallnames[code], td->td_retval[0]); 422 } 423 switch (error) { 424 case 0: 425 if ((frame->fixreg[0] == SYS___syscall) && 426 (code != SYS_lseek)) { 427 /* 428 * 64-bit return, 32-bit syscall. Fixup byte order 429 */ 430 frame->fixreg[FIRSTARG] = 0; 431 frame->fixreg[FIRSTARG + 1] = td->td_retval[0]; 432 } else { 433 frame->fixreg[FIRSTARG] = td->td_retval[0]; 434 frame->fixreg[FIRSTARG + 1] = td->td_retval[1]; 435 } 436 /* XXX: Magic number */ 437 frame->cr &= ~0x10000000; 438 break; 439 case ERESTART: 440 /* 441 * Set user's pc back to redo the system call. 442 */ 443 frame->srr0 -= 4; 444 break; 445 case EJUSTRETURN: 446 /* nothing to do */ 447 break; 448 default: 449 if (p->p_sysent->sv_errsize) { 450 if (error >= p->p_sysent->sv_errsize) 451 error = -1; /* XXX */ 452 else 453 error = p->p_sysent->sv_errtbl[error]; 454 } 455 frame->fixreg[FIRSTARG] = error; 456 /* XXX: Magic number: Carry Flag Equivalent? */ 457 frame->cr |= 0x10000000; 458 break; 459 } 460 461 462 if ((callp->sy_narg & SYF_MPSAFE) == 0) 463 mtx_unlock(&Giant); 464 465 #ifdef KTRACE 466 if (KTRPOINT(td, KTR_SYSRET)) 467 ktrsysret(code, error, td->td_retval[0]); 468 #endif 469 470 /* 471 * Does the comment in the i386 code about errno apply here? 472 */ 473 STOPEVENT(p, S_SCX, code); 474 475 WITNESS_WARN(WARN_PANIC, NULL, "System call %s returning", 476 (code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???"); 477 mtx_assert(&sched_lock, MA_NOTOWNED); 478 mtx_assert(&Giant, MA_NOTOWNED); 479 } 480 481 static int 482 trap_pfault(struct trapframe *frame, int user) 483 { 484 vm_offset_t eva, va; 485 struct thread *td; 486 struct proc *p; 487 vm_map_t map; 488 vm_prot_t ftype; 489 int rv; 490 u_int user_sr; 491 492 td = curthread; 493 p = td->td_proc; 494 if (frame->exc == EXC_ISI) { 495 eva = frame->srr0; 496 ftype = VM_PROT_READ | VM_PROT_EXECUTE; 497 } else { 498 eva = frame->dar; 499 if (frame->dsisr & DSISR_STORE) 500 ftype = VM_PROT_WRITE; 501 else 502 ftype = VM_PROT_READ; 503 } 504 505 if (user) { 506 map = &p->p_vmspace->vm_map; 507 } else { 508 if ((eva >> ADDR_SR_SHFT) == USER_SR) { 509 if (p->p_vmspace == NULL) 510 return (SIGSEGV); 511 512 __asm ("mfsr %0, %1" 513 : "=r"(user_sr) 514 : "K"(USER_SR)); 515 eva &= ADDR_PIDX | ADDR_POFF; 516 eva |= user_sr << ADDR_SR_SHFT; 517 map = &p->p_vmspace->vm_map; 518 } else { 519 map = kernel_map; 520 } 521 } 522 va = trunc_page(eva); 523 524 if (map != kernel_map) { 525 /* 526 * Keep swapout from messing with us during this 527 * critical time. 528 */ 529 PROC_LOCK(p); 530 ++p->p_lock; 531 PROC_UNLOCK(p); 532 533 /* Fault in the user page: */ 534 rv = vm_fault(map, va, ftype, 535 (ftype & VM_PROT_WRITE) ? VM_FAULT_DIRTY 536 : VM_FAULT_NORMAL); 537 538 PROC_LOCK(p); 539 --p->p_lock; 540 PROC_UNLOCK(p); 541 } else { 542 /* 543 * Don't have to worry about process locking or stacks in the 544 * kernel. 545 */ 546 rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL); 547 } 548 549 if (rv == KERN_SUCCESS) 550 return (0); 551 552 if (!user && handle_onfault(frame)) 553 return (0); 554 555 return (SIGSEGV); 556 } 557 558 static __inline void 559 setusr(u_int content) 560 { 561 __asm __volatile ("isync; mtsr %0,%1; isync" 562 :: "n"(USER_SR), "r"(content)); 563 } 564 565 int 566 badaddr(void *addr, size_t size) 567 { 568 return (badaddr_read(addr, size, NULL)); 569 } 570 571 int 572 badaddr_read(void *addr, size_t size, int *rptr) 573 { 574 struct thread *td; 575 faultbuf env; 576 int x; 577 578 /* Get rid of any stale machine checks that have been waiting. */ 579 __asm __volatile ("sync; isync"); 580 581 td = PCPU_GET(curthread); 582 583 if (setfault(env)) { 584 td->td_pcb->pcb_onfault = 0; 585 __asm __volatile ("sync"); 586 return 1; 587 } 588 589 __asm __volatile ("sync"); 590 591 switch (size) { 592 case 1: 593 x = *(volatile int8_t *)addr; 594 break; 595 case 2: 596 x = *(volatile int16_t *)addr; 597 break; 598 case 4: 599 x = *(volatile int32_t *)addr; 600 break; 601 default: 602 panic("badaddr: invalid size (%d)", size); 603 } 604 605 /* Make sure we took the machine check, if we caused one. */ 606 __asm __volatile ("sync; isync"); 607 608 td->td_pcb->pcb_onfault = 0; 609 __asm __volatile ("sync"); /* To be sure. */ 610 611 /* Use the value to avoid reorder. */ 612 if (rptr) 613 *rptr = x; 614 615 return (0); 616 } 617 618 /* 619 * For now, this only deals with the particular unaligned access case 620 * that gcc tends to generate. Eventually it should handle all of the 621 * possibilities that can happen on a 32-bit PowerPC in big-endian mode. 622 */ 623 624 static int 625 fix_unaligned(struct thread *td, struct trapframe *frame) 626 { 627 struct thread *fputhread; 628 int indicator, reg; 629 double *fpr; 630 631 indicator = EXC_ALI_OPCODE_INDICATOR(frame->dsisr); 632 633 switch (indicator) { 634 case EXC_ALI_LFD: 635 case EXC_ALI_STFD: 636 reg = EXC_ALI_RST(frame->dsisr); 637 fpr = &td->td_pcb->pcb_fpu.fpr[reg]; 638 fputhread = PCPU_GET(fputhread); 639 640 /* Juggle the FPU to ensure that we've initialized 641 * the FPRs, and that their current state is in 642 * the PCB. 643 */ 644 if (fputhread != td) { 645 if (fputhread) 646 save_fpu(fputhread); 647 enable_fpu(td); 648 } 649 save_fpu(td); 650 651 if (indicator == EXC_ALI_LFD) { 652 if (copyin((void *)frame->dar, fpr, 653 sizeof(double)) != 0) 654 return -1; 655 enable_fpu(td); 656 } else { 657 if (copyout(fpr, (void *)frame->dar, 658 sizeof(double)) != 0) 659 return -1; 660 } 661 return 0; 662 break; 663 } 664 665 return -1; 666 }
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