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/5.2/sys/powerpc/powerpc/trap.c 114305 2003-04-30 17:59:27Z jhb $"); 36 37 #include "opt_ddb.h" 38 #include "opt_ktrace.h" 39 40 #include <sys/param.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/user.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 #include <ddb/ddb.h> 77 78 #ifndef MULTIPROCESSOR 79 extern int intr_depth; 80 #endif 81 82 void trap(struct trapframe *); 83 84 static void trap_fatal(struct trapframe *frame); 85 static void printtrap(u_int vector, struct trapframe *frame, int isfatal, 86 int user); 87 static int trap_pfault(struct trapframe *frame, int user); 88 static int fix_unaligned(struct thread *td, struct trapframe *frame); 89 static int handle_onfault(struct trapframe *frame); 90 static void syscall(struct trapframe *frame); 91 92 static __inline void setusr(u_int); 93 94 int setfault(faultbuf); /* defined in locore.S */ 95 96 /* Why are these not defined in a header? */ 97 int badaddr(void *, size_t); 98 int badaddr_read(void *, size_t, int *); 99 100 #ifdef WITNESS 101 extern char *syscallnames[]; 102 #endif 103 104 struct powerpc_exception { 105 u_int vector; 106 char *name; 107 }; 108 109 static struct powerpc_exception powerpc_exceptions[] = { 110 { 0x0100, "system reset" }, 111 { 0x0200, "machine check" }, 112 { 0x0300, "data storage interrupt" }, 113 { 0x0400, "instruction storage interrupt" }, 114 { 0x0500, "external interrupt" }, 115 { 0x0600, "alignment" }, 116 { 0x0700, "program" }, 117 { 0x0800, "floating-point unavailable" }, 118 { 0x0900, "decrementer" }, 119 { 0x0c00, "system call" }, 120 { 0x0d00, "trace" }, 121 { 0x0e00, "floating-point assist" }, 122 { 0x0f00, "performance monitoring" }, 123 { 0x0f20, "altivec unavailable" }, 124 { 0x1000, "instruction tlb miss" }, 125 { 0x1100, "data load tlb miss" }, 126 { 0x1200, "data store tlb miss" }, 127 { 0x1300, "instruction breakpoint" }, 128 { 0x1400, "system management" }, 129 { 0x1600, "altivec assist" }, 130 { 0x1700, "thermal management" }, 131 { 0x2000, "run mode/trace" }, 132 { 0x3000, NULL } 133 }; 134 135 static const char * 136 trapname(u_int vector) 137 { 138 struct powerpc_exception *pe; 139 140 for (pe = powerpc_exceptions; pe->vector != 0x3000; pe++) { 141 if (pe->vector == vector) 142 return (pe->name); 143 } 144 145 return ("unknown"); 146 } 147 148 void 149 trap(struct trapframe *frame) 150 { 151 struct thread *td; 152 struct proc *p; 153 int sig, type, user; 154 u_int sticks, ucode; 155 156 atomic_add_int(&cnt.v_trap, 1); 157 158 td = PCPU_GET(curthread); 159 p = td->td_proc; 160 161 type = ucode = frame->exc; 162 sig = 0; 163 user = frame->srr1 & PSL_PR; 164 sticks = 0; 165 166 CTR3(KTR_TRAP, "trap: %s type=%s (%s)", p->p_comm, 167 trapname(type), user ? "user" : "kernel"); 168 169 if (user) { 170 sticks = td->td_sticks; 171 td->td_frame = frame; 172 if (td->td_ucred != p->p_ucred) 173 cred_update_thread(td); 174 175 /* User Mode Traps */ 176 switch (type) { 177 case EXC_RUNMODETRC: 178 case EXC_TRC: 179 frame->srr1 &= ~PSL_SE; 180 sig = SIGTRAP; 181 break; 182 183 case EXC_DSI: 184 case EXC_ISI: 185 sig = trap_pfault(frame, 1); 186 break; 187 188 case EXC_SC: 189 syscall(frame); 190 break; 191 192 case EXC_FPU: 193 KASSERT((td->td_pcb->pcb_flags & PCB_FPU) != PCB_FPU, 194 ("FPU already enabled for thread")); 195 enable_fpu(td); 196 break; 197 198 #ifdef ALTIVEC 199 case EXC_VEC: 200 if ((vecthread = PCPU_GET(vecthread)) != NULL) { 201 KASSERT(vecthread != td, 202 ("altivec already enabled")); 203 save_vec(vecthread); 204 } 205 PCPU_SET(vecthread, td); 206 td->td_pcb->pcb_veccpu = PCPU_GET(cpuid); 207 enable_vec(td); 208 frame->srr1 |= PSL_VEC; 209 break; 210 #endif /* ALTIVEC */ 211 212 case EXC_ALI: 213 if (fix_unaligned(td, frame) != 0) 214 sig = SIGBUS; 215 else 216 frame->srr0 += 4; 217 break; 218 219 case EXC_PGM: 220 /* XXX temporarily */ 221 /* XXX: Magic Number? */ 222 if (frame->srr1 & 0x0002000) 223 sig = SIGTRAP; 224 else 225 sig = SIGILL; 226 break; 227 228 default: 229 trap_fatal(frame); 230 } 231 } else { 232 /* Kernel Mode Traps */ 233 234 KASSERT(cold || td->td_ucred != NULL, 235 ("kernel trap doesn't have ucred")); 236 switch (type) { 237 case EXC_DSI: 238 if (trap_pfault(frame, 0) == 0) 239 return; 240 break; 241 case EXC_MCHK: 242 if (handle_onfault(frame)) 243 return; 244 break; 245 default: 246 trap_fatal(frame); 247 } 248 } 249 250 #ifdef ALTIVEC 251 if (td != PCPU_GET(vecthread) || 252 td->td_pcb->pcb_veccpu != PCPU_GET(cpuid)) 253 frame->srr1 &= ~PSL_VEC; 254 #endif /* ALTIVEC */ 255 256 if (sig != 0) { 257 if (p->p_sysent->sv_transtrap != NULL) 258 sig = (p->p_sysent->sv_transtrap)(sig, type); 259 trapsignal(td, sig, ucode); 260 } 261 262 userret(td, frame, sticks); 263 mtx_assert(&Giant, MA_NOTOWNED); 264 #ifdef DIAGNOSTIC 265 cred_free_thread(td); 266 #endif /* DIAGNOSTIC */ 267 } 268 269 static void 270 trap_fatal(struct trapframe *frame) 271 { 272 273 printtrap(frame->exc, frame, 1, (frame->srr1 & PSL_PR)); 274 #ifdef DDB 275 if ((debugger_on_panic || db_active) && kdb_trap(frame->exc, frame)) 276 return; 277 #endif 278 panic("%s trap", trapname(frame->exc)); 279 } 280 281 static void 282 printtrap(u_int vector, struct trapframe *frame, int isfatal, int user) 283 { 284 285 printf("\n"); 286 printf("%s %s trap:\n", isfatal ? "fatal" : "handled", 287 user ? "user" : "kernel"); 288 printf("\n"); 289 printf(" exception = 0x%x (%s)\n", vector >> 8, 290 trapname(vector)); 291 switch (vector) { 292 case EXC_DSI: 293 printf(" virtual address = 0x%x\n", frame->dar); 294 break; 295 case EXC_ISI: 296 printf(" virtual address = 0x%x\n", frame->srr0); 297 break; 298 } 299 printf(" srr0 = 0x%x\n", frame->srr0); 300 printf(" srr1 = 0x%x\n", frame->srr1); 301 printf(" curthread = %p\n", curthread); 302 if (curthread != NULL) 303 printf(" pid = %d, comm = %s\n", 304 curthread->td_proc->p_pid, curthread->td_proc->p_comm); 305 printf("\n"); 306 } 307 308 /* 309 * Handles a fatal fault when we have onfault state to recover. Returns 310 * non-zero if there was onfault recovery state available. 311 */ 312 static int 313 handle_onfault(struct trapframe *frame) 314 { 315 struct thread *td; 316 faultbuf *fb; 317 318 td = curthread; 319 fb = td->td_pcb->pcb_onfault; 320 if (fb != NULL) { 321 frame->srr0 = (*fb)[0]; 322 frame->fixreg[1] = (*fb)[1]; 323 frame->fixreg[2] = (*fb)[2]; 324 frame->cr = (*fb)[3]; 325 bcopy(&(*fb)[4], &frame->fixreg[13], 326 19 * sizeof(register_t)); 327 return (1); 328 } 329 return (0); 330 } 331 332 void 333 syscall(struct trapframe *frame) 334 { 335 caddr_t params; 336 struct sysent *callp; 337 struct thread *td; 338 struct proc *p; 339 int error, n; 340 size_t narg; 341 register_t args[10]; 342 u_int code; 343 344 td = PCPU_GET(curthread); 345 p = td->td_proc; 346 347 atomic_add_int(&cnt.v_syscall, 1); 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 #ifdef KTRACE 397 if (KTRPOINT(td, KTR_SYSCALL)) 398 ktrsyscall(code, narg, (register_t *)params); 399 #endif 400 /* 401 * Try to run the syscall without Giant if the syscall is MP safe. 402 */ 403 if ((callp->sy_narg & SYF_MPSAFE) == 0) 404 mtx_lock(&Giant); 405 406 if (error == 0) { 407 td->td_retval[0] = 0; 408 td->td_retval[1] = frame->fixreg[FIRSTARG + 1]; 409 410 STOPEVENT(p, S_SCE, narg); 411 412 error = (*callp->sy_call)(td, params); 413 } 414 switch (error) { 415 case 0: 416 if ((frame->fixreg[0] == SYS___syscall) && 417 (code != SYS_lseek)) { 418 /* 419 * 64-bit return, 32-bit syscall. Fixup byte order 420 */ 421 frame->fixreg[FIRSTARG] = 0; 422 frame->fixreg[FIRSTARG + 1] = td->td_retval[0]; 423 } else { 424 frame->fixreg[FIRSTARG] = td->td_retval[0]; 425 frame->fixreg[FIRSTARG + 1] = td->td_retval[1]; 426 } 427 /* XXX: Magic number */ 428 frame->cr &= ~0x10000000; 429 break; 430 case ERESTART: 431 /* 432 * Set user's pc back to redo the system call. 433 */ 434 frame->srr0 -= 4; 435 break; 436 case EJUSTRETURN: 437 /* nothing to do */ 438 break; 439 default: 440 if (p->p_sysent->sv_errsize) { 441 if (error >= p->p_sysent->sv_errsize) 442 error = -1; /* XXX */ 443 else 444 error = p->p_sysent->sv_errtbl[error]; 445 } 446 frame->fixreg[FIRSTARG] = error; 447 /* XXX: Magic number: Carry Flag Equivalent? */ 448 frame->cr |= 0x10000000; 449 break; 450 } 451 452 453 if ((callp->sy_narg & SYF_MPSAFE) == 0) 454 mtx_unlock(&Giant); 455 456 #ifdef KTRACE 457 if (KTRPOINT(td, KTR_SYSRET)) 458 ktrsysret(code, error, td->td_retval[0]); 459 #endif 460 461 /* 462 * Does the comment in the i386 code about errno apply here? 463 */ 464 STOPEVENT(p, S_SCX, code); 465 466 WITNESS_WARN(WARN_PANIC, NULL, "System call %s returning", 467 (code >= 0 && code < SYS_MAXSYSCALL) ? syscallnames[code] : "???"); 468 mtx_assert(&sched_lock, MA_NOTOWNED); 469 mtx_assert(&Giant, MA_NOTOWNED); 470 } 471 472 static int 473 trap_pfault(struct trapframe *frame, int user) 474 { 475 vm_offset_t eva, va; 476 struct thread *td; 477 struct proc *p; 478 vm_map_t map; 479 vm_prot_t ftype; 480 int rv; 481 u_int user_sr; 482 483 td = curthread; 484 p = td->td_proc; 485 if (frame->exc == EXC_ISI) { 486 eva = frame->srr0; 487 ftype = VM_PROT_READ | VM_PROT_EXECUTE; 488 } else { 489 eva = frame->dar; 490 if (frame->dsisr & DSISR_STORE) 491 ftype = VM_PROT_WRITE; 492 else 493 ftype = VM_PROT_READ; 494 } 495 496 if (user) { 497 map = &p->p_vmspace->vm_map; 498 } else { 499 if ((eva >> ADDR_SR_SHFT) == USER_SR) { 500 if (p->p_vmspace == NULL) 501 return (SIGSEGV); 502 503 __asm ("mfsr %0, %1" 504 : "=r"(user_sr) 505 : "K"(USER_SR)); 506 eva &= ADDR_PIDX | ADDR_POFF; 507 eva |= user_sr << ADDR_SR_SHFT; 508 map = &p->p_vmspace->vm_map; 509 } else { 510 map = kernel_map; 511 } 512 } 513 va = trunc_page(eva); 514 515 mtx_lock(&Giant); 516 if (map != kernel_map) { 517 /* 518 * Keep swapout from messing with us during this 519 * critical time. 520 */ 521 PROC_LOCK(p); 522 ++p->p_lock; 523 PROC_UNLOCK(p); 524 525 /* Fault in the user page: */ 526 rv = vm_fault(map, va, ftype, 527 (ftype & VM_PROT_WRITE) ? VM_FAULT_DIRTY 528 : VM_FAULT_NORMAL); 529 530 PROC_LOCK(p); 531 --p->p_lock; 532 PROC_UNLOCK(p); 533 } else { 534 /* 535 * Don't have to worry about process locking or stacks in the 536 * kernel. 537 */ 538 rv = vm_fault(map, va, ftype, VM_FAULT_NORMAL); 539 } 540 mtx_unlock(&Giant); 541 542 if (rv == KERN_SUCCESS) 543 return (0); 544 545 if (!user && handle_onfault(frame)) 546 return (0); 547 548 return (SIGSEGV); 549 } 550 551 static __inline void 552 setusr(u_int content) 553 { 554 __asm __volatile ("isync; mtsr %0,%1; isync" 555 :: "n"(USER_SR), "r"(content)); 556 } 557 558 int 559 badaddr(void *addr, size_t size) 560 { 561 return (badaddr_read(addr, size, NULL)); 562 } 563 564 int 565 badaddr_read(void *addr, size_t size, int *rptr) 566 { 567 struct thread *td; 568 faultbuf env; 569 int x; 570 571 /* Get rid of any stale machine checks that have been waiting. */ 572 __asm __volatile ("sync; isync"); 573 574 td = PCPU_GET(curthread); 575 576 if (setfault(env)) { 577 td->td_pcb->pcb_onfault = 0; 578 __asm __volatile ("sync"); 579 return 1; 580 } 581 582 __asm __volatile ("sync"); 583 584 switch (size) { 585 case 1: 586 x = *(volatile int8_t *)addr; 587 break; 588 case 2: 589 x = *(volatile int16_t *)addr; 590 break; 591 case 4: 592 x = *(volatile int32_t *)addr; 593 break; 594 default: 595 panic("badaddr: invalid size (%d)", size); 596 } 597 598 /* Make sure we took the machine check, if we caused one. */ 599 __asm __volatile ("sync; isync"); 600 601 td->td_pcb->pcb_onfault = 0; 602 __asm __volatile ("sync"); /* To be sure. */ 603 604 /* Use the value to avoid reorder. */ 605 if (rptr) 606 *rptr = x; 607 608 return (0); 609 } 610 611 /* 612 * For now, this only deals with the particular unaligned access case 613 * that gcc tends to generate. Eventually it should handle all of the 614 * possibilities that can happen on a 32-bit PowerPC in big-endian mode. 615 */ 616 617 static int 618 fix_unaligned(struct thread *td, struct trapframe *frame) 619 { 620 struct thread *fputhread; 621 int indicator, reg; 622 double *fpr; 623 624 indicator = EXC_ALI_OPCODE_INDICATOR(frame->dsisr); 625 626 switch (indicator) { 627 case EXC_ALI_LFD: 628 case EXC_ALI_STFD: 629 reg = EXC_ALI_RST(frame->dsisr); 630 fpr = &td->td_pcb->pcb_fpu.fpr[reg]; 631 fputhread = PCPU_GET(fputhread); 632 633 /* Juggle the FPU to ensure that we've initialized 634 * the FPRs, and that their current state is in 635 * the PCB. 636 */ 637 if (fputhread != td) { 638 if (fputhread) 639 save_fpu(fputhread); 640 enable_fpu(td); 641 } 642 save_fpu(td); 643 644 if (indicator == EXC_ALI_LFD) { 645 if (copyin((void *)frame->dar, fpr, 646 sizeof(double)) != 0) 647 return -1; 648 enable_fpu(td); 649 } else { 650 if (copyout(fpr, (void *)frame->dar, 651 sizeof(double)) != 0) 652 return -1; 653 } 654 return 0; 655 break; 656 } 657 658 return -1; 659 }
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