1 /*- 2 * Copyright (c) 2014 Andrew Turner 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28 #include "opt_ddb.h" 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/asan.h> 33 #include <sys/kernel.h> 34 #include <sys/ktr.h> 35 #include <sys/lock.h> 36 #include <sys/msan.h> 37 #include <sys/mutex.h> 38 #include <sys/proc.h> 39 #include <sys/ptrace.h> 40 #include <sys/syscall.h> 41 #include <sys/sysent.h> 42 #ifdef KDB 43 #include <sys/kdb.h> 44 #endif 45 46 #include <vm/vm.h> 47 #include <vm/pmap.h> 48 #include <vm/vm_kern.h> 49 #include <vm/vm_map.h> 50 #include <vm/vm_param.h> 51 #include <vm/vm_extern.h> 52 53 #include <machine/frame.h> 54 #include <machine/md_var.h> 55 #include <machine/pcb.h> 56 #include <machine/pcpu.h> 57 #include <machine/undefined.h> 58 59 #ifdef KDTRACE_HOOKS 60 #include <sys/dtrace_bsd.h> 61 #endif 62 63 #ifdef VFP 64 #include <machine/vfp.h> 65 #endif 66 67 #ifdef KDB 68 #include <machine/db_machdep.h> 69 #endif 70 71 #ifdef DDB 72 #include <ddb/ddb.h> 73 #include <ddb/db_sym.h> 74 #endif 75 76 /* Called from exception.S */ 77 void do_el1h_sync(struct thread *, struct trapframe *); 78 void do_el0_sync(struct thread *, struct trapframe *); 79 void do_el0_error(struct trapframe *); 80 void do_serror(struct trapframe *); 81 void unhandled_exception(struct trapframe *); 82 83 static void print_gp_register(const char *name, uint64_t value); 84 static void print_registers(struct trapframe *frame); 85 86 int (*dtrace_invop_jump_addr)(struct trapframe *); 87 88 typedef void (abort_handler)(struct thread *, struct trapframe *, uint64_t, 89 uint64_t, int); 90 91 static abort_handler align_abort; 92 static abort_handler data_abort; 93 static abort_handler external_abort; 94 95 static abort_handler *abort_handlers[] = { 96 [ISS_DATA_DFSC_TF_L0] = data_abort, 97 [ISS_DATA_DFSC_TF_L1] = data_abort, 98 [ISS_DATA_DFSC_TF_L2] = data_abort, 99 [ISS_DATA_DFSC_TF_L3] = data_abort, 100 [ISS_DATA_DFSC_AFF_L1] = data_abort, 101 [ISS_DATA_DFSC_AFF_L2] = data_abort, 102 [ISS_DATA_DFSC_AFF_L3] = data_abort, 103 [ISS_DATA_DFSC_PF_L1] = data_abort, 104 [ISS_DATA_DFSC_PF_L2] = data_abort, 105 [ISS_DATA_DFSC_PF_L3] = data_abort, 106 [ISS_DATA_DFSC_ALIGN] = align_abort, 107 [ISS_DATA_DFSC_EXT] = external_abort, 108 [ISS_DATA_DFSC_EXT_L0] = external_abort, 109 [ISS_DATA_DFSC_EXT_L1] = external_abort, 110 [ISS_DATA_DFSC_EXT_L2] = external_abort, 111 [ISS_DATA_DFSC_EXT_L3] = external_abort, 112 [ISS_DATA_DFSC_ECC] = external_abort, 113 [ISS_DATA_DFSC_ECC_L0] = external_abort, 114 [ISS_DATA_DFSC_ECC_L1] = external_abort, 115 [ISS_DATA_DFSC_ECC_L2] = external_abort, 116 [ISS_DATA_DFSC_ECC_L3] = external_abort, 117 }; 118 119 static __inline void 120 call_trapsignal(struct thread *td, int sig, int code, void *addr, int trapno) 121 { 122 ksiginfo_t ksi; 123 124 ksiginfo_init_trap(&ksi); 125 ksi.ksi_signo = sig; 126 ksi.ksi_code = code; 127 ksi.ksi_addr = addr; 128 ksi.ksi_trapno = trapno; 129 trapsignal(td, &ksi); 130 } 131 132 int 133 cpu_fetch_syscall_args(struct thread *td) 134 { 135 struct proc *p; 136 syscallarg_t *ap, *dst_ap; 137 struct syscall_args *sa; 138 139 p = td->td_proc; 140 sa = &td->td_sa; 141 ap = td->td_frame->tf_x; 142 dst_ap = &sa->args[0]; 143 144 sa->code = td->td_frame->tf_x[8]; 145 sa->original_code = sa->code; 146 147 if (__predict_false(sa->code == SYS_syscall || sa->code == SYS___syscall)) { 148 sa->code = *ap++; 149 } else { 150 *dst_ap++ = *ap++; 151 } 152 153 if (__predict_false(sa->code >= p->p_sysent->sv_size)) 154 sa->callp = &nosys_sysent; 155 else 156 sa->callp = &p->p_sysent->sv_table[sa->code]; 157 158 KASSERT(sa->callp->sy_narg <= nitems(sa->args), 159 ("Syscall %d takes too many arguments", sa->code)); 160 161 memcpy(dst_ap, ap, (nitems(sa->args) - 1) * sizeof(*dst_ap)); 162 163 td->td_retval[0] = 0; 164 td->td_retval[1] = 0; 165 166 return (0); 167 } 168 169 #include "../../kern/subr_syscall.c" 170 171 /* 172 * Test for fault generated by given access instruction in 173 * bus_peek_<foo> or bus_poke_<foo> bus function. 174 */ 175 extern uint32_t generic_bs_peek_1f, generic_bs_peek_2f; 176 extern uint32_t generic_bs_peek_4f, generic_bs_peek_8f; 177 extern uint32_t generic_bs_poke_1f, generic_bs_poke_2f; 178 extern uint32_t generic_bs_poke_4f, generic_bs_poke_8f; 179 180 static bool 181 test_bs_fault(void *addr) 182 { 183 return (addr == &generic_bs_peek_1f || 184 addr == &generic_bs_peek_2f || 185 addr == &generic_bs_peek_4f || 186 addr == &generic_bs_peek_8f || 187 addr == &generic_bs_poke_1f || 188 addr == &generic_bs_poke_2f || 189 addr == &generic_bs_poke_4f || 190 addr == &generic_bs_poke_8f); 191 } 192 193 static void 194 svc_handler(struct thread *td, struct trapframe *frame) 195 { 196 197 if ((frame->tf_esr & ESR_ELx_ISS_MASK) == 0) { 198 syscallenter(td); 199 syscallret(td); 200 } else { 201 call_trapsignal(td, SIGILL, ILL_ILLOPN, (void *)frame->tf_elr, 202 ESR_ELx_EXCEPTION(frame->tf_esr)); 203 userret(td, frame); 204 } 205 } 206 207 static void 208 align_abort(struct thread *td, struct trapframe *frame, uint64_t esr, 209 uint64_t far, int lower) 210 { 211 if (!lower) { 212 print_registers(frame); 213 print_gp_register("far", far); 214 printf(" esr: 0x%.16lx\n", esr); 215 panic("Misaligned access from kernel space!"); 216 } 217 218 call_trapsignal(td, SIGBUS, BUS_ADRALN, (void *)frame->tf_elr, 219 ESR_ELx_EXCEPTION(frame->tf_esr)); 220 userret(td, frame); 221 } 222 223 224 static void 225 external_abort(struct thread *td, struct trapframe *frame, uint64_t esr, 226 uint64_t far, int lower) 227 { 228 if (lower) { 229 call_trapsignal(td, SIGBUS, BUS_OBJERR, (void *)far, 230 ESR_ELx_EXCEPTION(frame->tf_esr)); 231 userret(td, frame); 232 return; 233 } 234 235 /* 236 * Try to handle synchronous external aborts caused by 237 * bus_space_peek() and/or bus_space_poke() functions. 238 */ 239 if (test_bs_fault((void *)frame->tf_elr)) { 240 frame->tf_elr = (uint64_t)generic_bs_fault; 241 return; 242 } 243 244 print_registers(frame); 245 print_gp_register("far", far); 246 panic("Unhandled external data abort"); 247 } 248 249 /* 250 * It is unsafe to access the stack canary value stored in "td" until 251 * kernel map translation faults are handled, see the pmap_klookup() call below. 252 * Thus, stack-smashing detection with per-thread canaries must be disabled in 253 * this function. 254 */ 255 static void NO_PERTHREAD_SSP 256 data_abort(struct thread *td, struct trapframe *frame, uint64_t esr, 257 uint64_t far, int lower) 258 { 259 struct vm_map *map; 260 struct pcb *pcb; 261 vm_prot_t ftype; 262 int error, sig, ucode; 263 #ifdef KDB 264 bool handled; 265 #endif 266 267 /* 268 * According to the ARMv8-A rev. A.g, B2.10.5 "Load-Exclusive 269 * and Store-Exclusive instruction usage restrictions", state 270 * of the exclusive monitors after data abort exception is unknown. 271 */ 272 clrex(); 273 274 #ifdef KDB 275 if (kdb_active) { 276 kdb_reenter(); 277 return; 278 } 279 #endif 280 281 if (lower) { 282 map = &td->td_proc->p_vmspace->vm_map; 283 } else if (!ADDR_IS_CANONICAL(far)) { 284 /* We received a TBI/PAC/etc. fault from the kernel */ 285 error = KERN_INVALID_ADDRESS; 286 pcb = td->td_pcb; 287 goto bad_far; 288 } else if (ADDR_IS_KERNEL(far)) { 289 /* 290 * Handle a special case: the data abort was caused by accessing 291 * a thread structure while its mapping was being promoted or 292 * demoted, as a consequence of the break-before-make rule. It 293 * is not safe to enable interrupts or dereference "td" before 294 * this case is handled. 295 * 296 * In principle, if pmap_klookup() fails, there is no need to 297 * call pmap_fault() below, but avoiding that call is not worth 298 * the effort. 299 */ 300 if (ESR_ELx_EXCEPTION(esr) == EXCP_DATA_ABORT) { 301 switch (esr & ISS_DATA_DFSC_MASK) { 302 case ISS_DATA_DFSC_TF_L0: 303 case ISS_DATA_DFSC_TF_L1: 304 case ISS_DATA_DFSC_TF_L2: 305 case ISS_DATA_DFSC_TF_L3: 306 if (pmap_klookup(far, NULL)) 307 return; 308 break; 309 } 310 } 311 if (td->td_md.md_spinlock_count == 0 && 312 (frame->tf_spsr & PSR_DAIF_INTR) != PSR_DAIF_INTR) { 313 MPASS((frame->tf_spsr & PSR_DAIF_INTR) == 0); 314 intr_enable(); 315 } 316 map = kernel_map; 317 } else { 318 if (td->td_md.md_spinlock_count == 0 && 319 (frame->tf_spsr & PSR_DAIF_INTR) != PSR_DAIF_INTR) { 320 MPASS((frame->tf_spsr & PSR_DAIF_INTR) == 0); 321 intr_enable(); 322 } 323 map = &td->td_proc->p_vmspace->vm_map; 324 if (map == NULL) 325 map = kernel_map; 326 } 327 pcb = td->td_pcb; 328 329 /* 330 * Try to handle translation, access flag, and permission faults. 331 * Translation faults may occur as a result of the required 332 * break-before-make sequence used when promoting or demoting 333 * superpages. Such faults must not occur while holding the pmap lock, 334 * or pmap_fault() will recurse on that lock. 335 */ 336 if ((lower || map == kernel_map || pcb->pcb_onfault != 0) && 337 pmap_fault(map->pmap, esr, far) == KERN_SUCCESS) 338 return; 339 340 #ifdef INVARIANTS 341 if (td->td_md.md_spinlock_count != 0) { 342 print_registers(frame); 343 print_gp_register("far", far); 344 printf(" esr: 0x%.16lx\n", esr); 345 panic("data abort with spinlock held (spinlock count %d != 0)", 346 td->td_md.md_spinlock_count); 347 } 348 #endif 349 if ((td->td_pflags & TDP_NOFAULTING) == 0 && 350 (td->td_critnest != 0 || WITNESS_CHECK(WARN_SLEEPOK | 351 WARN_GIANTOK, NULL, "Kernel page fault") != 0)) { 352 print_registers(frame); 353 print_gp_register("far", far); 354 printf(" esr: 0x%.16lx\n", esr); 355 panic("data abort in critical section or under mutex"); 356 } 357 358 switch (ESR_ELx_EXCEPTION(esr)) { 359 case EXCP_INSN_ABORT: 360 case EXCP_INSN_ABORT_L: 361 ftype = VM_PROT_EXECUTE; 362 break; 363 default: 364 /* 365 * If the exception was because of a read or cache operation 366 * pass a read fault type into the vm code. Cache operations 367 * need read permission but will set the WnR flag when the 368 * memory is unmapped. 369 */ 370 if ((esr & ISS_DATA_WnR) == 0 || (esr & ISS_DATA_CM) != 0) 371 ftype = VM_PROT_READ; 372 else 373 ftype = VM_PROT_WRITE; 374 break; 375 } 376 377 /* Fault in the page. */ 378 error = vm_fault_trap(map, far, ftype, VM_FAULT_NORMAL, &sig, &ucode); 379 if (error != KERN_SUCCESS) { 380 if (lower) { 381 call_trapsignal(td, sig, ucode, (void *)far, 382 ESR_ELx_EXCEPTION(esr)); 383 } else { 384 bad_far: 385 if (td->td_intr_nesting_level == 0 && 386 pcb->pcb_onfault != 0) { 387 frame->tf_elr = pcb->pcb_onfault; 388 return; 389 } 390 391 printf("Fatal data abort:\n"); 392 print_registers(frame); 393 print_gp_register("far", far); 394 printf(" esr: 0x%.16lx\n", esr); 395 396 #ifdef KDB 397 if (debugger_on_trap) { 398 kdb_why = KDB_WHY_TRAP; 399 handled = kdb_trap(ESR_ELx_EXCEPTION(esr), 0, 400 frame); 401 kdb_why = KDB_WHY_UNSET; 402 if (handled) 403 return; 404 } 405 #endif 406 panic("vm_fault failed: 0x%lx error %d", 407 frame->tf_elr, error); 408 } 409 } 410 411 if (lower) 412 userret(td, frame); 413 } 414 415 static void 416 print_gp_register(const char *name, uint64_t value) 417 { 418 #if defined(DDB) 419 c_db_sym_t sym; 420 const char *sym_name; 421 db_expr_t sym_value; 422 db_expr_t offset; 423 #endif 424 425 printf(" %s: 0x%.16lx", name, value); 426 #if defined(DDB) 427 /* If this looks like a kernel address try to find the symbol */ 428 if (value >= VM_MIN_KERNEL_ADDRESS) { 429 sym = db_search_symbol(value, DB_STGY_ANY, &offset); 430 if (sym != C_DB_SYM_NULL) { 431 db_symbol_values(sym, &sym_name, &sym_value); 432 printf(" (%s + 0x%lx)", sym_name, offset); 433 } 434 } 435 #endif 436 printf("\n"); 437 } 438 439 static void 440 print_registers(struct trapframe *frame) 441 { 442 char name[4]; 443 u_int reg; 444 445 for (reg = 0; reg < nitems(frame->tf_x); reg++) { 446 snprintf(name, sizeof(name), "%sx%d", (reg < 10) ? " " : "", 447 reg); 448 print_gp_register(name, frame->tf_x[reg]); 449 } 450 printf(" sp: 0x%.16lx\n", frame->tf_sp); 451 print_gp_register(" lr", frame->tf_lr); 452 print_gp_register("elr", frame->tf_elr); 453 printf("spsr: 0x%.16lx\n", frame->tf_spsr); 454 } 455 456 #ifdef VFP 457 static void 458 fpe_trap(struct thread *td, void *addr, uint32_t exception) 459 { 460 int code; 461 462 code = FPE_FLTIDO; 463 if ((exception & ISS_FP_TFV) != 0) { 464 if ((exception & ISS_FP_IOF) != 0) 465 code = FPE_FLTINV; 466 else if ((exception & ISS_FP_DZF) != 0) 467 code = FPE_FLTDIV; 468 else if ((exception & ISS_FP_OFF) != 0) 469 code = FPE_FLTOVF; 470 else if ((exception & ISS_FP_UFF) != 0) 471 code = FPE_FLTUND; 472 else if ((exception & ISS_FP_IXF) != 0) 473 code = FPE_FLTRES; 474 } 475 call_trapsignal(td, SIGFPE, code, addr, exception); 476 } 477 #endif 478 479 /* 480 * See the comment above data_abort(). 481 */ 482 void NO_PERTHREAD_SSP 483 do_el1h_sync(struct thread *td, struct trapframe *frame) 484 { 485 uint32_t exception; 486 uint64_t esr, far; 487 int dfsc; 488 489 kasan_mark(frame, sizeof(*frame), sizeof(*frame), 0); 490 kmsan_mark(frame, sizeof(*frame), KMSAN_STATE_INITED); 491 492 far = frame->tf_far; 493 /* Read the esr register to get the exception details */ 494 esr = frame->tf_esr; 495 exception = ESR_ELx_EXCEPTION(esr); 496 497 #ifdef KDTRACE_HOOKS 498 if (dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, exception)) 499 return; 500 #endif 501 502 CTR4(KTR_TRAP, "%s: exception=%lu, elr=0x%lx, esr=0x%lx", 503 __func__, exception, frame->tf_elr, esr); 504 505 /* 506 * Enable debug exceptions if we aren't already handling one. They will 507 * be masked again in the exception handler's epilogue. 508 */ 509 switch (exception) { 510 case EXCP_BRK: 511 case EXCP_BRKPT_EL1: 512 case EXCP_WATCHPT_EL1: 513 case EXCP_SOFTSTP_EL1: 514 break; 515 default: 516 dbg_enable(); 517 break; 518 } 519 520 switch (exception) { 521 case EXCP_FP_SIMD: 522 case EXCP_TRAP_FP: 523 #ifdef VFP 524 if ((td->td_pcb->pcb_fpflags & PCB_FP_KERN) != 0) { 525 vfp_restore_state(); 526 } else 527 #endif 528 { 529 print_registers(frame); 530 printf(" esr: 0x%.16lx\n", esr); 531 panic("VFP exception in the kernel"); 532 } 533 break; 534 case EXCP_INSN_ABORT: 535 case EXCP_DATA_ABORT: 536 dfsc = esr & ISS_DATA_DFSC_MASK; 537 if (dfsc < nitems(abort_handlers) && 538 abort_handlers[dfsc] != NULL) { 539 abort_handlers[dfsc](td, frame, esr, far, 0); 540 } else { 541 print_registers(frame); 542 print_gp_register("far", far); 543 printf(" esr: 0x%.16lx\n", esr); 544 panic("Unhandled EL1 %s abort: 0x%x", 545 exception == EXCP_INSN_ABORT ? "instruction" : 546 "data", dfsc); 547 } 548 break; 549 case EXCP_BRK: 550 #ifdef KDTRACE_HOOKS 551 if ((esr & ESR_ELx_ISS_MASK) == 0x40d /* BRK_IMM16_VAL */ && 552 dtrace_invop_jump_addr != NULL && 553 dtrace_invop_jump_addr(frame) == 0) 554 break; 555 #endif 556 #ifdef KDB 557 kdb_trap(exception, 0, frame); 558 #else 559 panic("No debugger in kernel."); 560 #endif 561 break; 562 case EXCP_BRKPT_EL1: 563 case EXCP_WATCHPT_EL1: 564 case EXCP_SOFTSTP_EL1: 565 #ifdef KDB 566 kdb_trap(exception, 0, frame); 567 #else 568 panic("No debugger in kernel."); 569 #endif 570 break; 571 case EXCP_FPAC: 572 /* We can see this if the authentication on PAC fails */ 573 print_registers(frame); 574 print_gp_register("far", far); 575 panic("FPAC kernel exception"); 576 break; 577 case EXCP_UNKNOWN: 578 if (undef_insn(1, frame)) 579 break; 580 print_registers(frame); 581 print_gp_register("far", far); 582 panic("Undefined instruction: %08x", 583 *(uint32_t *)frame->tf_elr); 584 break; 585 case EXCP_BTI: 586 print_registers(frame); 587 print_gp_register("far", far); 588 panic("Branch Target exception"); 589 break; 590 default: 591 print_registers(frame); 592 print_gp_register("far", far); 593 panic("Unknown kernel exception 0x%x esr_el1 0x%lx", exception, 594 esr); 595 } 596 } 597 598 void 599 do_el0_sync(struct thread *td, struct trapframe *frame) 600 { 601 pcpu_bp_harden bp_harden; 602 uint32_t exception; 603 uint64_t esr, far; 604 int dfsc; 605 606 /* Check we have a sane environment when entering from userland */ 607 KASSERT((uintptr_t)get_pcpu() >= VM_MIN_KERNEL_ADDRESS, 608 ("Invalid pcpu address from userland: %p (tpidr 0x%lx)", 609 get_pcpu(), READ_SPECIALREG(tpidr_el1))); 610 611 kasan_mark(frame, sizeof(*frame), sizeof(*frame), 0); 612 kmsan_mark(frame, sizeof(*frame), KMSAN_STATE_INITED); 613 614 far = frame->tf_far; 615 esr = frame->tf_esr; 616 exception = ESR_ELx_EXCEPTION(esr); 617 if (exception == EXCP_INSN_ABORT_L && far > VM_MAXUSER_ADDRESS) { 618 /* 619 * Userspace may be trying to train the branch predictor to 620 * attack the kernel. If we are on a CPU affected by this 621 * call the handler to clear the branch predictor state. 622 */ 623 bp_harden = PCPU_GET(bp_harden); 624 if (bp_harden != NULL) 625 bp_harden(); 626 } 627 intr_enable(); 628 629 CTR4(KTR_TRAP, "%s: exception=%lu, elr=0x%lx, esr=0x%lx", 630 __func__, exception, frame->tf_elr, esr); 631 632 switch (exception) { 633 case EXCP_FP_SIMD: 634 #ifdef VFP 635 vfp_restore_state(); 636 #else 637 panic("VFP exception in userland"); 638 #endif 639 break; 640 case EXCP_TRAP_FP: 641 #ifdef VFP 642 fpe_trap(td, (void *)frame->tf_elr, esr); 643 userret(td, frame); 644 #else 645 panic("VFP exception in userland"); 646 #endif 647 break; 648 case EXCP_SVE: 649 /* Returns true if this thread can use SVE */ 650 if (!sve_restore_state(td)) 651 call_trapsignal(td, SIGILL, ILL_ILLTRP, 652 (void *)frame->tf_elr, exception); 653 userret(td, frame); 654 break; 655 case EXCP_SVC32: 656 case EXCP_SVC64: 657 svc_handler(td, frame); 658 break; 659 case EXCP_INSN_ABORT_L: 660 case EXCP_DATA_ABORT_L: 661 case EXCP_DATA_ABORT: 662 dfsc = esr & ISS_DATA_DFSC_MASK; 663 if (dfsc < nitems(abort_handlers) && 664 abort_handlers[dfsc] != NULL) 665 abort_handlers[dfsc](td, frame, esr, far, 1); 666 else { 667 print_registers(frame); 668 print_gp_register("far", far); 669 printf(" esr: 0x%.16lx\n", esr); 670 panic("Unhandled EL0 %s abort: 0x%x", 671 exception == EXCP_INSN_ABORT_L ? "instruction" : 672 "data", dfsc); 673 } 674 break; 675 case EXCP_UNKNOWN: 676 if (!undef_insn(0, frame)) 677 call_trapsignal(td, SIGILL, ILL_ILLTRP, (void *)far, 678 exception); 679 userret(td, frame); 680 break; 681 case EXCP_FPAC: 682 call_trapsignal(td, SIGILL, ILL_ILLOPN, (void *)frame->tf_elr, 683 exception); 684 userret(td, frame); 685 break; 686 case EXCP_SP_ALIGN: 687 call_trapsignal(td, SIGBUS, BUS_ADRALN, (void *)frame->tf_sp, 688 exception); 689 userret(td, frame); 690 break; 691 case EXCP_PC_ALIGN: 692 call_trapsignal(td, SIGBUS, BUS_ADRALN, (void *)frame->tf_elr, 693 exception); 694 userret(td, frame); 695 break; 696 case EXCP_BRKPT_EL0: 697 case EXCP_BRK: 698 #ifdef COMPAT_FREEBSD32 699 case EXCP_BRKPT_32: 700 #endif /* COMPAT_FREEBSD32 */ 701 call_trapsignal(td, SIGTRAP, TRAP_BRKPT, (void *)frame->tf_elr, 702 exception); 703 userret(td, frame); 704 break; 705 case EXCP_WATCHPT_EL0: 706 call_trapsignal(td, SIGTRAP, TRAP_TRACE, (void *)far, 707 exception); 708 userret(td, frame); 709 break; 710 case EXCP_MSR: 711 /* 712 * The CPU can raise EXCP_MSR when userspace executes an mrs 713 * instruction to access a special register userspace doesn't 714 * have access to. 715 */ 716 if (!undef_insn(0, frame)) 717 call_trapsignal(td, SIGILL, ILL_PRVOPC, 718 (void *)frame->tf_elr, exception); 719 userret(td, frame); 720 break; 721 case EXCP_SOFTSTP_EL0: 722 PROC_LOCK(td->td_proc); 723 if ((td->td_dbgflags & TDB_STEP) != 0) { 724 td->td_frame->tf_spsr &= ~PSR_SS; 725 td->td_pcb->pcb_flags &= ~PCB_SINGLE_STEP; 726 WRITE_SPECIALREG(mdscr_el1, 727 READ_SPECIALREG(mdscr_el1) & ~MDSCR_SS); 728 } 729 PROC_UNLOCK(td->td_proc); 730 call_trapsignal(td, SIGTRAP, TRAP_TRACE, 731 (void *)frame->tf_elr, exception); 732 userret(td, frame); 733 break; 734 case EXCP_BTI: 735 call_trapsignal(td, SIGILL, ILL_ILLOPC, (void *)frame->tf_elr, 736 exception); 737 userret(td, frame); 738 break; 739 default: 740 call_trapsignal(td, SIGBUS, BUS_OBJERR, (void *)frame->tf_elr, 741 exception); 742 userret(td, frame); 743 break; 744 } 745 746 KASSERT( 747 (td->td_pcb->pcb_fpflags & ~(PCB_FP_USERMASK|PCB_FP_SVEVALID)) == 0, 748 ("Kernel VFP flags set while entering userspace")); 749 KASSERT( 750 td->td_pcb->pcb_fpusaved == &td->td_pcb->pcb_fpustate, 751 ("Kernel VFP state in use when entering userspace")); 752 } 753 754 /* 755 * TODO: We will need to handle these later when we support ARMv8.2 RAS. 756 */ 757 void 758 do_serror(struct trapframe *frame) 759 { 760 uint64_t esr, far; 761 762 kasan_mark(frame, sizeof(*frame), sizeof(*frame), 0); 763 kmsan_mark(frame, sizeof(*frame), KMSAN_STATE_INITED); 764 765 far = frame->tf_far; 766 esr = frame->tf_esr; 767 768 print_registers(frame); 769 print_gp_register("far", far); 770 printf(" esr: 0x%.16lx\n", esr); 771 panic("Unhandled System Error"); 772 } 773 774 void 775 unhandled_exception(struct trapframe *frame) 776 { 777 uint64_t esr, far; 778 779 kasan_mark(frame, sizeof(*frame), sizeof(*frame), 0); 780 kmsan_mark(frame, sizeof(*frame), KMSAN_STATE_INITED); 781 782 far = frame->tf_far; 783 esr = frame->tf_esr; 784 785 print_registers(frame); 786 print_gp_register("far", far); 787 printf(" esr: 0x%.16lx\n", esr); 788 panic("Unhandled exception"); 789 } 790