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/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/kernel.h>
36 #include <sys/ktr.h>
37 #include <sys/lock.h>
38 #include <sys/mutex.h>
39 #include <sys/proc.h>
40 #include <sys/ptrace.h>
41 #include <sys/syscall.h>
42 #include <sys/sysent.h>
43 #ifdef KDB
44 #include <sys/kdb.h>
45 #endif
46
47 #include <vm/vm.h>
48 #include <vm/pmap.h>
49 #include <vm/vm_kern.h>
50 #include <vm/vm_map.h>
51 #include <vm/vm_param.h>
52 #include <vm/vm_extern.h>
53
54 #include <machine/frame.h>
55 #include <machine/md_var.h>
56 #include <machine/pcb.h>
57 #include <machine/pcpu.h>
58 #include <machine/undefined.h>
59
60 #ifdef KDTRACE_HOOKS
61 #include <sys/dtrace_bsd.h>
62 #endif
63
64 #ifdef VFP
65 #include <machine/vfp.h>
66 #endif
67
68 #ifdef KDB
69 #include <machine/db_machdep.h>
70 #endif
71
72 #ifdef DDB
73 #include <ddb/ddb.h>
74 #include <ddb/db_sym.h>
75 #endif
76
77 /* Called from exception.S */
78 void do_el1h_sync(struct thread *, struct trapframe *);
79 void do_el0_sync(struct thread *, struct trapframe *);
80 void do_el0_error(struct trapframe *);
81 void do_serror(struct trapframe *);
82 void unhandled_exception(struct trapframe *);
83
84 static void print_gp_register(const char *name, uint64_t value);
85 static void print_registers(struct trapframe *frame);
86
87 int (*dtrace_invop_jump_addr)(struct trapframe *);
88
89 typedef void (abort_handler)(struct thread *, struct trapframe *, uint64_t,
90 uint64_t, int);
91
92 static abort_handler align_abort;
93 static abort_handler data_abort;
94 static abort_handler external_abort;
95
96 static abort_handler *abort_handlers[] = {
97 [ISS_DATA_DFSC_TF_L0] = data_abort,
98 [ISS_DATA_DFSC_TF_L1] = data_abort,
99 [ISS_DATA_DFSC_TF_L2] = data_abort,
100 [ISS_DATA_DFSC_TF_L3] = data_abort,
101 [ISS_DATA_DFSC_AFF_L1] = data_abort,
102 [ISS_DATA_DFSC_AFF_L2] = data_abort,
103 [ISS_DATA_DFSC_AFF_L3] = data_abort,
104 [ISS_DATA_DFSC_PF_L1] = data_abort,
105 [ISS_DATA_DFSC_PF_L2] = data_abort,
106 [ISS_DATA_DFSC_PF_L3] = data_abort,
107 [ISS_DATA_DFSC_ALIGN] = align_abort,
108 [ISS_DATA_DFSC_EXT] = external_abort,
109 [ISS_DATA_DFSC_EXT_L0] = external_abort,
110 [ISS_DATA_DFSC_EXT_L1] = external_abort,
111 [ISS_DATA_DFSC_EXT_L2] = external_abort,
112 [ISS_DATA_DFSC_EXT_L3] = external_abort,
113 [ISS_DATA_DFSC_ECC] = external_abort,
114 [ISS_DATA_DFSC_ECC_L0] = external_abort,
115 [ISS_DATA_DFSC_ECC_L1] = external_abort,
116 [ISS_DATA_DFSC_ECC_L2] = external_abort,
117 [ISS_DATA_DFSC_ECC_L3] = external_abort,
118 };
119
120 static __inline void
call_trapsignal(struct thread * td,int sig,int code,void * addr,int trapno)121 call_trapsignal(struct thread *td, int sig, int code, void *addr, int trapno)
122 {
123 ksiginfo_t ksi;
124
125 ksiginfo_init_trap(&ksi);
126 ksi.ksi_signo = sig;
127 ksi.ksi_code = code;
128 ksi.ksi_addr = addr;
129 ksi.ksi_trapno = trapno;
130 trapsignal(td, &ksi);
131 }
132
133 int
cpu_fetch_syscall_args(struct thread * td)134 cpu_fetch_syscall_args(struct thread *td)
135 {
136 struct proc *p;
137 register_t *ap, *dst_ap;
138 struct syscall_args *sa;
139
140 p = td->td_proc;
141 sa = &td->td_sa;
142 ap = td->td_frame->tf_x;
143 dst_ap = &sa->args[0];
144
145 sa->code = td->td_frame->tf_x[8];
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 = &p->p_sysent->sv_table[0];
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, (MAXARGS - 1) * sizeof(register_t));
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
test_bs_fault(void * addr)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
svc_handler(struct thread * td,struct trapframe * frame)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
align_abort(struct thread * td,struct trapframe * frame,uint64_t esr,uint64_t far,int lower)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: %.8lx\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
external_abort(struct thread * td,struct trapframe * frame,uint64_t esr,uint64_t far,int lower)225 external_abort(struct thread *td, struct trapframe *frame, uint64_t esr,
226 uint64_t far, int lower)
227 {
228
229 /*
230 * Try to handle synchronous external aborts caused by
231 * bus_space_peek() and/or bus_space_poke() functions.
232 */
233 if (!lower && test_bs_fault((void *)frame->tf_elr)) {
234 frame->tf_elr = (uint64_t)generic_bs_fault;
235 return;
236 }
237
238 print_registers(frame);
239 print_gp_register("far", far);
240 panic("Unhandled EL%d external data abort", lower ? 0: 1);
241 }
242
243 static void
data_abort(struct thread * td,struct trapframe * frame,uint64_t esr,uint64_t far,int lower)244 data_abort(struct thread *td, struct trapframe *frame, uint64_t esr,
245 uint64_t far, int lower)
246 {
247 struct vm_map *map;
248 struct proc *p;
249 struct pcb *pcb;
250 vm_prot_t ftype;
251 int error, sig, ucode;
252 #ifdef KDB
253 bool handled;
254 #endif
255
256 /*
257 * According to the ARMv8-A rev. A.g, B2.10.5 "Load-Exclusive
258 * and Store-Exclusive instruction usage restrictions", state
259 * of the exclusive monitors after data abort exception is unknown.
260 */
261 clrex();
262
263 #ifdef KDB
264 if (kdb_active) {
265 kdb_reenter();
266 return;
267 }
268 #endif
269
270 pcb = td->td_pcb;
271 p = td->td_proc;
272 if (lower)
273 map = &p->p_vmspace->vm_map;
274 else {
275 intr_enable();
276
277 /* We received a TBI/PAC/etc. fault from the kernel */
278 if (!ADDR_IS_CANONICAL(far)) {
279 error = KERN_INVALID_ADDRESS;
280 goto bad_far;
281 }
282
283 /* The top bit tells us which range to use */
284 if (ADDR_IS_KERNEL(far)) {
285 map = kernel_map;
286 } else {
287 map = &p->p_vmspace->vm_map;
288 if (map == NULL)
289 map = kernel_map;
290 }
291 }
292
293 /*
294 * Try to handle translation, access flag, and permission faults.
295 * Translation faults may occur as a result of the required
296 * break-before-make sequence used when promoting or demoting
297 * superpages. Such faults must not occur while holding the pmap lock,
298 * or pmap_fault() will recurse on that lock.
299 */
300 if ((lower || map == kernel_map || pcb->pcb_onfault != 0) &&
301 pmap_fault(map->pmap, esr, far) == KERN_SUCCESS)
302 return;
303
304 KASSERT(td->td_md.md_spinlock_count == 0,
305 ("data abort with spinlock held"));
306 if (td->td_critnest != 0 || WITNESS_CHECK(WARN_SLEEPOK |
307 WARN_GIANTOK, NULL, "Kernel page fault") != 0) {
308 print_registers(frame);
309 print_gp_register("far", far);
310 printf(" esr: %.8lx\n", esr);
311 panic("data abort in critical section or under mutex");
312 }
313
314 switch (ESR_ELx_EXCEPTION(esr)) {
315 case EXCP_INSN_ABORT:
316 case EXCP_INSN_ABORT_L:
317 ftype = VM_PROT_EXECUTE;
318 break;
319 default:
320 /*
321 * If the exception was because of a read or cache operation
322 * pass a read fault type into the vm code. Cache operations
323 * need read permission but will set the WnR flag when the
324 * memory is unmapped.
325 */
326 if ((esr & ISS_DATA_WnR) == 0 || (esr & ISS_DATA_CM) != 0)
327 ftype = VM_PROT_READ;
328 else
329 ftype = VM_PROT_WRITE;
330 break;
331 }
332
333 /* Fault in the page. */
334 error = vm_fault_trap(map, far, ftype, VM_FAULT_NORMAL, &sig, &ucode);
335 if (error != KERN_SUCCESS) {
336 bad_far:
337 if (lower) {
338 call_trapsignal(td, sig, ucode, (void *)far,
339 ESR_ELx_EXCEPTION(esr));
340 } else {
341 if (td->td_intr_nesting_level == 0 &&
342 pcb->pcb_onfault != 0) {
343 frame->tf_x[0] = error;
344 frame->tf_elr = pcb->pcb_onfault;
345 return;
346 }
347
348 printf("Fatal data abort:\n");
349 print_registers(frame);
350 print_gp_register("far", far);
351 printf(" esr: %.8lx\n", esr);
352
353 #ifdef KDB
354 if (debugger_on_trap) {
355 kdb_why = KDB_WHY_TRAP;
356 handled = kdb_trap(ESR_ELx_EXCEPTION(esr), 0,
357 frame);
358 kdb_why = KDB_WHY_UNSET;
359 if (handled)
360 return;
361 }
362 #endif
363 panic("vm_fault failed: %lx", frame->tf_elr);
364 }
365 }
366
367 if (lower)
368 userret(td, frame);
369 }
370
371 static void
print_gp_register(const char * name,uint64_t value)372 print_gp_register(const char *name, uint64_t value)
373 {
374 #if defined(DDB)
375 c_db_sym_t sym;
376 const char *sym_name;
377 db_expr_t sym_value;
378 db_expr_t offset;
379 #endif
380
381 printf(" %s: %16lx", name, value);
382 #if defined(DDB)
383 /* If this looks like a kernel address try to find the symbol */
384 if (value >= VM_MIN_KERNEL_ADDRESS) {
385 sym = db_search_symbol(value, DB_STGY_ANY, &offset);
386 if (sym != C_DB_SYM_NULL) {
387 db_symbol_values(sym, &sym_name, &sym_value);
388 printf(" (%s + %lx)", sym_name, offset);
389 }
390 }
391 #endif
392 printf("\n");
393 }
394
395 static void
print_registers(struct trapframe * frame)396 print_registers(struct trapframe *frame)
397 {
398 char name[4];
399 u_int reg;
400
401 for (reg = 0; reg < nitems(frame->tf_x); reg++) {
402 snprintf(name, sizeof(name), "%sx%d", (reg < 10) ? " " : "",
403 reg);
404 print_gp_register(name, frame->tf_x[reg]);
405 }
406 printf(" sp: %16lx\n", frame->tf_sp);
407 print_gp_register(" lr", frame->tf_lr);
408 print_gp_register("elr", frame->tf_elr);
409 printf("spsr: %8x\n", frame->tf_spsr);
410 }
411
412 void
do_el1h_sync(struct thread * td,struct trapframe * frame)413 do_el1h_sync(struct thread *td, struct trapframe *frame)
414 {
415 uint32_t exception;
416 uint64_t esr, far;
417 int dfsc;
418
419 /* Read the esr register to get the exception details */
420 esr = frame->tf_esr;
421 exception = ESR_ELx_EXCEPTION(esr);
422
423 #ifdef KDTRACE_HOOKS
424 if (dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, exception))
425 return;
426 #endif
427
428 CTR4(KTR_TRAP,
429 "do_el1_sync: curthread: %p, esr %lx, elr: %lx, frame: %p", td,
430 esr, frame->tf_elr, frame);
431
432 /*
433 * Enable debug exceptions if we aren't already handling one. They will
434 * be masked again in the exception handler's epilogue.
435 */
436 if (exception != EXCP_BRK && exception != EXCP_WATCHPT_EL1 &&
437 exception != EXCP_SOFTSTP_EL1)
438 dbg_enable();
439
440 switch (exception) {
441 case EXCP_FP_SIMD:
442 case EXCP_TRAP_FP:
443 #ifdef VFP
444 if ((td->td_pcb->pcb_fpflags & PCB_FP_KERN) != 0) {
445 vfp_restore_state();
446 } else
447 #endif
448 {
449 print_registers(frame);
450 printf(" esr: %.8lx\n", esr);
451 panic("VFP exception in the kernel");
452 }
453 break;
454 case EXCP_INSN_ABORT:
455 case EXCP_DATA_ABORT:
456 far = READ_SPECIALREG(far_el1);
457 dfsc = esr & ISS_DATA_DFSC_MASK;
458 if (dfsc < nitems(abort_handlers) &&
459 abort_handlers[dfsc] != NULL) {
460 abort_handlers[dfsc](td, frame, esr, far, 0);
461 } else {
462 print_registers(frame);
463 print_gp_register("far", far);
464 printf(" esr: %.8lx\n", esr);
465 panic("Unhandled EL1 %s abort: %x",
466 exception == EXCP_INSN_ABORT ? "instruction" :
467 "data", dfsc);
468 }
469 break;
470 case EXCP_BRK:
471 #ifdef KDTRACE_HOOKS
472 if ((esr & ESR_ELx_ISS_MASK) == 0x40d && \
473 dtrace_invop_jump_addr != 0) {
474 dtrace_invop_jump_addr(frame);
475 break;
476 }
477 #endif
478 #ifdef KDB
479 kdb_trap(exception, 0, frame);
480 #else
481 panic("No debugger in kernel.");
482 #endif
483 break;
484 case EXCP_WATCHPT_EL1:
485 case EXCP_SOFTSTP_EL1:
486 #ifdef KDB
487 kdb_trap(exception, 0, frame);
488 #else
489 panic("No debugger in kernel.");
490 #endif
491 break;
492 case EXCP_UNKNOWN:
493 if (undef_insn(1, frame))
494 break;
495 /* FALLTHROUGH */
496 default:
497 print_registers(frame);
498 print_gp_register("far", READ_SPECIALREG(far_el1));
499 panic("Unknown kernel exception %x esr_el1 %lx", exception,
500 esr);
501 }
502 }
503
504 void
do_el0_sync(struct thread * td,struct trapframe * frame)505 do_el0_sync(struct thread *td, struct trapframe *frame)
506 {
507 pcpu_bp_harden bp_harden;
508 uint32_t exception;
509 uint64_t esr, far;
510 int dfsc;
511
512 /* Check we have a sane environment when entering from userland */
513 KASSERT((uintptr_t)get_pcpu() >= VM_MIN_KERNEL_ADDRESS,
514 ("Invalid pcpu address from userland: %p (tpidr %lx)",
515 get_pcpu(), READ_SPECIALREG(tpidr_el1)));
516
517 esr = frame->tf_esr;
518 exception = ESR_ELx_EXCEPTION(esr);
519 switch (exception) {
520 case EXCP_INSN_ABORT_L:
521 far = READ_SPECIALREG(far_el1);
522
523 /*
524 * Userspace may be trying to train the branch predictor to
525 * attack the kernel. If we are on a CPU affected by this
526 * call the handler to clear the branch predictor state.
527 */
528 if (far > VM_MAXUSER_ADDRESS) {
529 bp_harden = PCPU_GET(bp_harden);
530 if (bp_harden != NULL)
531 bp_harden();
532 }
533 break;
534 case EXCP_UNKNOWN:
535 case EXCP_DATA_ABORT_L:
536 case EXCP_DATA_ABORT:
537 case EXCP_WATCHPT_EL0:
538 far = READ_SPECIALREG(far_el1);
539 break;
540 }
541 intr_enable();
542
543 CTR4(KTR_TRAP,
544 "do_el0_sync: curthread: %p, esr %lx, elr: %lx, frame: %p", td, esr,
545 frame->tf_elr, frame);
546
547 switch (exception) {
548 case EXCP_FP_SIMD:
549 case EXCP_TRAP_FP:
550 #ifdef VFP
551 vfp_restore_state();
552 #else
553 panic("VFP exception in userland");
554 #endif
555 break;
556 case EXCP_SVC32:
557 case EXCP_SVC64:
558 svc_handler(td, frame);
559 break;
560 case EXCP_INSN_ABORT_L:
561 case EXCP_DATA_ABORT_L:
562 case EXCP_DATA_ABORT:
563 dfsc = esr & ISS_DATA_DFSC_MASK;
564 if (dfsc < nitems(abort_handlers) &&
565 abort_handlers[dfsc] != NULL)
566 abort_handlers[dfsc](td, frame, esr, far, 1);
567 else {
568 print_registers(frame);
569 print_gp_register("far", far);
570 printf(" esr: %.8lx\n", esr);
571 panic("Unhandled EL0 %s abort: %x",
572 exception == EXCP_INSN_ABORT_L ? "instruction" :
573 "data", dfsc);
574 }
575 break;
576 case EXCP_UNKNOWN:
577 if (!undef_insn(0, frame))
578 call_trapsignal(td, SIGILL, ILL_ILLTRP, (void *)far,
579 exception);
580 userret(td, frame);
581 break;
582 case EXCP_SP_ALIGN:
583 call_trapsignal(td, SIGBUS, BUS_ADRALN, (void *)frame->tf_sp,
584 exception);
585 userret(td, frame);
586 break;
587 case EXCP_PC_ALIGN:
588 call_trapsignal(td, SIGBUS, BUS_ADRALN, (void *)frame->tf_elr,
589 exception);
590 userret(td, frame);
591 break;
592 case EXCP_BRKPT_EL0:
593 case EXCP_BRK:
594 call_trapsignal(td, SIGTRAP, TRAP_BRKPT, (void *)frame->tf_elr,
595 exception);
596 userret(td, frame);
597 break;
598 case EXCP_WATCHPT_EL0:
599 call_trapsignal(td, SIGTRAP, TRAP_TRACE, (void *)far,
600 exception);
601 userret(td, frame);
602 break;
603 case EXCP_MSR:
604 /*
605 * The CPU can raise EXCP_MSR when userspace executes an mrs
606 * instruction to access a special register userspace doesn't
607 * have access to.
608 */
609 if (!undef_insn(0, frame))
610 call_trapsignal(td, SIGILL, ILL_PRVOPC,
611 (void *)frame->tf_elr, exception);
612 userret(td, frame);
613 break;
614 case EXCP_SOFTSTP_EL0:
615 PROC_LOCK(td->td_proc);
616 if ((td->td_dbgflags & TDB_STEP) != 0) {
617 td->td_frame->tf_spsr &= ~PSR_SS;
618 td->td_pcb->pcb_flags &= ~PCB_SINGLE_STEP;
619 WRITE_SPECIALREG(mdscr_el1,
620 READ_SPECIALREG(mdscr_el1) & ~MDSCR_SS);
621 }
622 PROC_UNLOCK(td->td_proc);
623 call_trapsignal(td, SIGTRAP, TRAP_TRACE,
624 (void *)frame->tf_elr, exception);
625 userret(td, frame);
626 break;
627 default:
628 call_trapsignal(td, SIGBUS, BUS_OBJERR, (void *)frame->tf_elr,
629 exception);
630 userret(td, frame);
631 break;
632 }
633
634 KASSERT((td->td_pcb->pcb_fpflags & ~PCB_FP_USERMASK) == 0,
635 ("Kernel VFP flags set while entering userspace"));
636 KASSERT(
637 td->td_pcb->pcb_fpusaved == &td->td_pcb->pcb_fpustate,
638 ("Kernel VFP state in use when entering userspace"));
639 }
640
641 /*
642 * TODO: We will need to handle these later when we support ARMv8.2 RAS.
643 */
644 void
do_serror(struct trapframe * frame)645 do_serror(struct trapframe *frame)
646 {
647 uint64_t esr, far;
648
649 far = READ_SPECIALREG(far_el1);
650 esr = frame->tf_esr;
651
652 print_registers(frame);
653 print_gp_register("far", far);
654 printf(" esr: %.8lx\n", esr);
655 panic("Unhandled System Error");
656 }
657
658 void
unhandled_exception(struct trapframe * frame)659 unhandled_exception(struct trapframe *frame)
660 {
661 uint64_t esr, far;
662
663 far = READ_SPECIALREG(far_el1);
664 esr = frame->tf_esr;
665
666 print_registers(frame);
667 print_gp_register("far", far);
668 printf(" esr: %.8lx\n", esr);
669 panic("Unhandled exception");
670 }
671