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 intr_enable(); 312 map = kernel_map; 313 } else { 314 intr_enable(); 315 map = &td->td_proc->p_vmspace->vm_map; 316 if (map == NULL) 317 map = kernel_map; 318 } 319 pcb = td->td_pcb; 320 321 /* 322 * Try to handle translation, access flag, and permission faults. 323 * Translation faults may occur as a result of the required 324 * break-before-make sequence used when promoting or demoting 325 * superpages. Such faults must not occur while holding the pmap lock, 326 * or pmap_fault() will recurse on that lock. 327 */ 328 if ((lower || map == kernel_map || pcb->pcb_onfault != 0) && 329 pmap_fault(map->pmap, esr, far) == KERN_SUCCESS) 330 return; 331 332 #ifdef INVARIANTS 333 if (td->td_md.md_spinlock_count != 0) { 334 print_registers(frame); 335 print_gp_register("far", far); 336 printf(" esr: 0x%.16lx\n", esr); 337 panic("data abort with spinlock held (spinlock count %d != 0)", 338 td->td_md.md_spinlock_count); 339 } 340 #endif 341 if (td->td_critnest != 0 || WITNESS_CHECK(WARN_SLEEPOK | 342 WARN_GIANTOK, NULL, "Kernel page fault") != 0) { 343 print_registers(frame); 344 print_gp_register("far", far); 345 printf(" esr: 0x%.16lx\n", esr); 346 panic("data abort in critical section or under mutex"); 347 } 348 349 switch (ESR_ELx_EXCEPTION(esr)) { 350 case EXCP_INSN_ABORT: 351 case EXCP_INSN_ABORT_L: 352 ftype = VM_PROT_EXECUTE; 353 break; 354 default: 355 /* 356 * If the exception was because of a read or cache operation 357 * pass a read fault type into the vm code. Cache operations 358 * need read permission but will set the WnR flag when the 359 * memory is unmapped. 360 */ 361 if ((esr & ISS_DATA_WnR) == 0 || (esr & ISS_DATA_CM) != 0) 362 ftype = VM_PROT_READ; 363 else 364 ftype = VM_PROT_WRITE; 365 break; 366 } 367 368 /* Fault in the page. */ 369 error = vm_fault_trap(map, far, ftype, VM_FAULT_NORMAL, &sig, &ucode); 370 if (error != KERN_SUCCESS) { 371 if (lower) { 372 call_trapsignal(td, sig, ucode, (void *)far, 373 ESR_ELx_EXCEPTION(esr)); 374 } else { 375 bad_far: 376 if (td->td_intr_nesting_level == 0 && 377 pcb->pcb_onfault != 0) { 378 frame->tf_x[0] = error; 379 frame->tf_elr = pcb->pcb_onfault; 380 return; 381 } 382 383 printf("Fatal data abort:\n"); 384 print_registers(frame); 385 print_gp_register("far", far); 386 printf(" esr: 0x%.16lx\n", esr); 387 388 #ifdef KDB 389 if (debugger_on_trap) { 390 kdb_why = KDB_WHY_TRAP; 391 handled = kdb_trap(ESR_ELx_EXCEPTION(esr), 0, 392 frame); 393 kdb_why = KDB_WHY_UNSET; 394 if (handled) 395 return; 396 } 397 #endif 398 panic("vm_fault failed: 0x%lx error %d", 399 frame->tf_elr, error); 400 } 401 } 402 403 if (lower) 404 userret(td, frame); 405 } 406 407 static void 408 print_gp_register(const char *name, uint64_t value) 409 { 410 #if defined(DDB) 411 c_db_sym_t sym; 412 const char *sym_name; 413 db_expr_t sym_value; 414 db_expr_t offset; 415 #endif 416 417 printf(" %s: 0x%.16lx", name, value); 418 #if defined(DDB) 419 /* If this looks like a kernel address try to find the symbol */ 420 if (value >= VM_MIN_KERNEL_ADDRESS) { 421 sym = db_search_symbol(value, DB_STGY_ANY, &offset); 422 if (sym != C_DB_SYM_NULL) { 423 db_symbol_values(sym, &sym_name, &sym_value); 424 printf(" (%s + 0x%lx)", sym_name, offset); 425 } 426 } 427 #endif 428 printf("\n"); 429 } 430 431 static void 432 print_registers(struct trapframe *frame) 433 { 434 char name[4]; 435 u_int reg; 436 437 for (reg = 0; reg < nitems(frame->tf_x); reg++) { 438 snprintf(name, sizeof(name), "%sx%d", (reg < 10) ? " " : "", 439 reg); 440 print_gp_register(name, frame->tf_x[reg]); 441 } 442 printf(" sp: 0x%.16lx\n", frame->tf_sp); 443 print_gp_register(" lr", frame->tf_lr); 444 print_gp_register("elr", frame->tf_elr); 445 printf("spsr: 0x%.16lx\n", frame->tf_spsr); 446 } 447 448 #ifdef VFP 449 static void 450 fpe_trap(struct thread *td, void *addr, uint32_t exception) 451 { 452 int code; 453 454 code = FPE_FLTIDO; 455 if ((exception & ISS_FP_TFV) != 0) { 456 if ((exception & ISS_FP_IOF) != 0) 457 code = FPE_FLTINV; 458 else if ((exception & ISS_FP_DZF) != 0) 459 code = FPE_FLTDIV; 460 else if ((exception & ISS_FP_OFF) != 0) 461 code = FPE_FLTOVF; 462 else if ((exception & ISS_FP_UFF) != 0) 463 code = FPE_FLTUND; 464 else if ((exception & ISS_FP_IXF) != 0) 465 code = FPE_FLTRES; 466 } 467 call_trapsignal(td, SIGFPE, code, addr, exception); 468 } 469 #endif 470 471 /* 472 * See the comment above data_abort(). 473 */ 474 void NO_PERTHREAD_SSP 475 do_el1h_sync(struct thread *td, struct trapframe *frame) 476 { 477 uint32_t exception; 478 uint64_t esr, far; 479 int dfsc; 480 481 kasan_mark(frame, sizeof(*frame), sizeof(*frame), 0); 482 kmsan_mark(frame, sizeof(*frame), KMSAN_STATE_INITED); 483 484 far = frame->tf_far; 485 /* Read the esr register to get the exception details */ 486 esr = frame->tf_esr; 487 exception = ESR_ELx_EXCEPTION(esr); 488 489 #ifdef KDTRACE_HOOKS 490 if (dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, exception)) 491 return; 492 #endif 493 494 CTR4(KTR_TRAP, "%s: exception=%lu, elr=0x%lx, esr=0x%lx", 495 __func__, exception, frame->tf_elr, esr); 496 497 /* 498 * Enable debug exceptions if we aren't already handling one. They will 499 * be masked again in the exception handler's epilogue. 500 */ 501 switch (exception) { 502 case EXCP_BRK: 503 case EXCP_WATCHPT_EL1: 504 case EXCP_SOFTSTP_EL1: 505 break; 506 default: 507 dbg_enable(); 508 break; 509 } 510 511 switch (exception) { 512 case EXCP_FP_SIMD: 513 case EXCP_TRAP_FP: 514 #ifdef VFP 515 if ((td->td_pcb->pcb_fpflags & PCB_FP_KERN) != 0) { 516 vfp_restore_state(); 517 } else 518 #endif 519 { 520 print_registers(frame); 521 printf(" esr: 0x%.16lx\n", esr); 522 panic("VFP exception in the kernel"); 523 } 524 break; 525 case EXCP_INSN_ABORT: 526 case EXCP_DATA_ABORT: 527 dfsc = esr & ISS_DATA_DFSC_MASK; 528 if (dfsc < nitems(abort_handlers) && 529 abort_handlers[dfsc] != NULL) { 530 abort_handlers[dfsc](td, frame, esr, far, 0); 531 } else { 532 print_registers(frame); 533 print_gp_register("far", far); 534 printf(" esr: 0x%.16lx\n", esr); 535 panic("Unhandled EL1 %s abort: 0x%x", 536 exception == EXCP_INSN_ABORT ? "instruction" : 537 "data", dfsc); 538 } 539 break; 540 case EXCP_BRK: 541 #ifdef KDTRACE_HOOKS 542 if ((esr & ESR_ELx_ISS_MASK) == 0x40d && \ 543 dtrace_invop_jump_addr != 0) { 544 dtrace_invop_jump_addr(frame); 545 break; 546 } 547 #endif 548 #ifdef KDB 549 kdb_trap(exception, 0, frame); 550 #else 551 panic("No debugger in kernel."); 552 #endif 553 break; 554 case EXCP_WATCHPT_EL1: 555 case EXCP_SOFTSTP_EL1: 556 #ifdef KDB 557 kdb_trap(exception, 0, frame); 558 #else 559 panic("No debugger in kernel."); 560 #endif 561 break; 562 case EXCP_FPAC: 563 /* We can see this if the authentication on PAC fails */ 564 print_registers(frame); 565 print_gp_register("far", far); 566 panic("FPAC kernel exception"); 567 break; 568 case EXCP_UNKNOWN: 569 if (undef_insn(1, frame)) 570 break; 571 print_registers(frame); 572 print_gp_register("far", far); 573 panic("Undefined instruction: %08x", 574 *(uint32_t *)frame->tf_elr); 575 break; 576 case EXCP_BTI: 577 print_registers(frame); 578 print_gp_register("far", far); 579 panic("Branch Target exception"); 580 break; 581 default: 582 print_registers(frame); 583 print_gp_register("far", far); 584 panic("Unknown kernel exception 0x%x esr_el1 0x%lx", exception, 585 esr); 586 } 587 } 588 589 void 590 do_el0_sync(struct thread *td, struct trapframe *frame) 591 { 592 pcpu_bp_harden bp_harden; 593 uint32_t exception; 594 uint64_t esr, far; 595 int dfsc; 596 597 /* Check we have a sane environment when entering from userland */ 598 KASSERT((uintptr_t)get_pcpu() >= VM_MIN_KERNEL_ADDRESS, 599 ("Invalid pcpu address from userland: %p (tpidr 0x%lx)", 600 get_pcpu(), READ_SPECIALREG(tpidr_el1))); 601 602 kasan_mark(frame, sizeof(*frame), sizeof(*frame), 0); 603 kmsan_mark(frame, sizeof(*frame), KMSAN_STATE_INITED); 604 605 far = frame->tf_far; 606 esr = frame->tf_esr; 607 exception = ESR_ELx_EXCEPTION(esr); 608 if (exception == EXCP_INSN_ABORT_L && far > VM_MAXUSER_ADDRESS) { 609 /* 610 * Userspace may be trying to train the branch predictor to 611 * attack the kernel. If we are on a CPU affected by this 612 * call the handler to clear the branch predictor state. 613 */ 614 bp_harden = PCPU_GET(bp_harden); 615 if (bp_harden != NULL) 616 bp_harden(); 617 } 618 intr_enable(); 619 620 CTR4(KTR_TRAP, "%s: exception=%lu, elr=0x%lx, esr=0x%lx", 621 __func__, exception, frame->tf_elr, esr); 622 623 switch (exception) { 624 case EXCP_FP_SIMD: 625 #ifdef VFP 626 vfp_restore_state(); 627 #else 628 panic("VFP exception in userland"); 629 #endif 630 break; 631 case EXCP_TRAP_FP: 632 #ifdef VFP 633 fpe_trap(td, (void *)frame->tf_elr, esr); 634 userret(td, frame); 635 #else 636 panic("VFP exception in userland"); 637 #endif 638 break; 639 case EXCP_SVE: 640 call_trapsignal(td, SIGILL, ILL_ILLTRP, (void *)frame->tf_elr, 641 exception); 642 userret(td, frame); 643 break; 644 case EXCP_SVC32: 645 case EXCP_SVC64: 646 svc_handler(td, frame); 647 break; 648 case EXCP_INSN_ABORT_L: 649 case EXCP_DATA_ABORT_L: 650 case EXCP_DATA_ABORT: 651 dfsc = esr & ISS_DATA_DFSC_MASK; 652 if (dfsc < nitems(abort_handlers) && 653 abort_handlers[dfsc] != NULL) 654 abort_handlers[dfsc](td, frame, esr, far, 1); 655 else { 656 print_registers(frame); 657 print_gp_register("far", far); 658 printf(" esr: 0x%.16lx\n", esr); 659 panic("Unhandled EL0 %s abort: 0x%x", 660 exception == EXCP_INSN_ABORT_L ? "instruction" : 661 "data", dfsc); 662 } 663 break; 664 case EXCP_UNKNOWN: 665 if (!undef_insn(0, frame)) 666 call_trapsignal(td, SIGILL, ILL_ILLTRP, (void *)far, 667 exception); 668 userret(td, frame); 669 break; 670 case EXCP_FPAC: 671 call_trapsignal(td, SIGILL, ILL_ILLOPN, (void *)frame->tf_elr, 672 exception); 673 userret(td, frame); 674 break; 675 case EXCP_SP_ALIGN: 676 call_trapsignal(td, SIGBUS, BUS_ADRALN, (void *)frame->tf_sp, 677 exception); 678 userret(td, frame); 679 break; 680 case EXCP_PC_ALIGN: 681 call_trapsignal(td, SIGBUS, BUS_ADRALN, (void *)frame->tf_elr, 682 exception); 683 userret(td, frame); 684 break; 685 case EXCP_BRKPT_EL0: 686 case EXCP_BRK: 687 #ifdef COMPAT_FREEBSD32 688 case EXCP_BRKPT_32: 689 #endif /* COMPAT_FREEBSD32 */ 690 call_trapsignal(td, SIGTRAP, TRAP_BRKPT, (void *)frame->tf_elr, 691 exception); 692 userret(td, frame); 693 break; 694 case EXCP_WATCHPT_EL0: 695 call_trapsignal(td, SIGTRAP, TRAP_TRACE, (void *)far, 696 exception); 697 userret(td, frame); 698 break; 699 case EXCP_MSR: 700 /* 701 * The CPU can raise EXCP_MSR when userspace executes an mrs 702 * instruction to access a special register userspace doesn't 703 * have access to. 704 */ 705 if (!undef_insn(0, frame)) 706 call_trapsignal(td, SIGILL, ILL_PRVOPC, 707 (void *)frame->tf_elr, exception); 708 userret(td, frame); 709 break; 710 case EXCP_SOFTSTP_EL0: 711 PROC_LOCK(td->td_proc); 712 if ((td->td_dbgflags & TDB_STEP) != 0) { 713 td->td_frame->tf_spsr &= ~PSR_SS; 714 td->td_pcb->pcb_flags &= ~PCB_SINGLE_STEP; 715 WRITE_SPECIALREG(mdscr_el1, 716 READ_SPECIALREG(mdscr_el1) & ~MDSCR_SS); 717 } 718 PROC_UNLOCK(td->td_proc); 719 call_trapsignal(td, SIGTRAP, TRAP_TRACE, 720 (void *)frame->tf_elr, exception); 721 userret(td, frame); 722 break; 723 case EXCP_BTI: 724 call_trapsignal(td, SIGILL, ILL_ILLOPC, (void *)frame->tf_elr, 725 exception); 726 userret(td, frame); 727 break; 728 default: 729 call_trapsignal(td, SIGBUS, BUS_OBJERR, (void *)frame->tf_elr, 730 exception); 731 userret(td, frame); 732 break; 733 } 734 735 KASSERT((td->td_pcb->pcb_fpflags & ~PCB_FP_USERMASK) == 0, 736 ("Kernel VFP flags set while entering userspace")); 737 KASSERT( 738 td->td_pcb->pcb_fpusaved == &td->td_pcb->pcb_fpustate, 739 ("Kernel VFP state in use when entering userspace")); 740 } 741 742 /* 743 * TODO: We will need to handle these later when we support ARMv8.2 RAS. 744 */ 745 void 746 do_serror(struct trapframe *frame) 747 { 748 uint64_t esr, far; 749 750 kasan_mark(frame, sizeof(*frame), sizeof(*frame), 0); 751 kmsan_mark(frame, sizeof(*frame), KMSAN_STATE_INITED); 752 753 far = frame->tf_far; 754 esr = frame->tf_esr; 755 756 print_registers(frame); 757 print_gp_register("far", far); 758 printf(" esr: 0x%.16lx\n", esr); 759 panic("Unhandled System Error"); 760 } 761 762 void 763 unhandled_exception(struct trapframe *frame) 764 { 765 uint64_t esr, far; 766 767 kasan_mark(frame, sizeof(*frame), sizeof(*frame), 0); 768 kmsan_mark(frame, sizeof(*frame), KMSAN_STATE_INITED); 769 770 far = frame->tf_far; 771 esr = frame->tf_esr; 772 773 print_registers(frame); 774 print_gp_register("far", far); 775 printf(" esr: 0x%.16lx\n", esr); 776 panic("Unhandled exception"); 777 } 778