2 * Copyright (c) 2014 Andrew Turner
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/kernel.h>
35 #include <sys/mutex.h>
36 #include <sys/pioctl.h>
38 #include <sys/ptrace.h>
39 #include <sys/syscall.h>
40 #include <sys/sysent.h>
47 #include <vm/vm_kern.h>
48 #include <vm/vm_map.h>
49 #include <vm/vm_param.h>
50 #include <vm/vm_extern.h>
52 #include <machine/frame.h>
53 #include <machine/pcb.h>
54 #include <machine/pcpu.h>
57 #include <sys/dtrace_bsd.h>
61 #include <machine/vfp.h>
65 #include <machine/db_machdep.h>
69 #include <ddb/db_output.h>
72 extern register_t fsu_intr_fault;
74 /* Called from exception.S */
75 void do_el1h_sync(struct thread *, struct trapframe *);
76 void do_el0_sync(struct thread *, struct trapframe *);
77 void do_el0_error(struct trapframe *);
78 static void print_registers(struct trapframe *frame);
80 int (*dtrace_invop_jump_addr)(struct trapframe *);
83 call_trapsignal(struct thread *td, int sig, int code, void *addr)
87 ksiginfo_init_trap(&ksi);
95 cpu_fetch_syscall_args(struct thread *td, struct syscall_args *sa)
103 ap = td->td_frame->tf_x;
105 sa->code = td->td_frame->tf_x[8];
107 if (sa->code == SYS_syscall || sa->code == SYS___syscall) {
112 if (p->p_sysent->sv_mask)
113 sa->code &= p->p_sysent->sv_mask;
114 if (sa->code >= p->p_sysent->sv_size)
115 sa->callp = &p->p_sysent->sv_table[0];
117 sa->callp = &p->p_sysent->sv_table[sa->code];
119 sa->narg = sa->callp->sy_narg;
120 memcpy(sa->args, ap, nap * sizeof(register_t));
122 panic("ARM64TODO: Could we have more than 8 args?");
124 td->td_retval[0] = 0;
125 td->td_retval[1] = 0;
130 #include "../../kern/subr_syscall.c"
133 svc_handler(struct thread *td, struct trapframe *frame)
135 struct syscall_args sa;
138 if ((frame->tf_esr & ESR_ELx_ISS_MASK) == 0) {
139 error = syscallenter(td, &sa);
140 syscallret(td, error, &sa);
142 call_trapsignal(td, SIGILL, ILL_ILLOPN, (void *)frame->tf_elr);
148 data_abort(struct thread *td, struct trapframe *frame, uint64_t esr,
149 uint64_t far, int lower)
156 int error, sig, ucode;
159 * According to the ARMv8-A rev. A.g, B2.10.5 "Load-Exclusive
160 * and Store-Exclusive instruction usage restrictions", state
161 * of the exclusive monitors after data abort exception is unknown.
175 * Special case for fuswintr and suswintr. These can't sleep so
176 * handle them early on in the trap handler.
178 if (__predict_false(pcb->pcb_onfault == (vm_offset_t)&fsu_intr_fault)) {
179 frame->tf_elr = pcb->pcb_onfault;
185 map = &p->p_vmspace->vm_map;
187 /* The top bit tells us which range to use */
188 if (far >= VM_MAXUSER_ADDRESS) {
191 map = &p->p_vmspace->vm_map;
197 if (pmap_fault(map->pmap, esr, far) == KERN_SUCCESS)
200 KASSERT(td->td_md.md_spinlock_count == 0,
201 ("data abort with spinlock held"));
202 if (td->td_critnest != 0 || WITNESS_CHECK(WARN_SLEEPOK |
203 WARN_GIANTOK, NULL, "Kernel page fault") != 0) {
204 print_registers(frame);
205 printf(" far: %16lx\n", far);
206 printf(" esr: %.8lx\n", esr);
207 panic("data abort in critical section or under mutex");
210 va = trunc_page(far);
211 ftype = ((esr >> 6) & 1) ? VM_PROT_READ | VM_PROT_WRITE : VM_PROT_READ;
213 /* Fault in the page. */
214 error = vm_fault(map, va, ftype, VM_FAULT_NORMAL);
215 if (error != KERN_SUCCESS) {
218 if (error == KERN_PROTECTION_FAILURE)
222 call_trapsignal(td, sig, ucode, (void *)far);
224 if (td->td_intr_nesting_level == 0 &&
225 pcb->pcb_onfault != 0) {
226 frame->tf_x[0] = error;
227 frame->tf_elr = pcb->pcb_onfault;
231 printf("Fatal data abort:\n");
232 print_registers(frame);
233 printf(" far: %16lx\n", far);
234 printf(" esr: %.8lx\n", esr);
237 if (debugger_on_panic || kdb_active)
238 if (kdb_trap(ESR_ELx_EXCEPTION(esr), 0, frame))
241 panic("vm_fault failed: %lx", frame->tf_elr);
250 print_registers(struct trapframe *frame)
254 for (reg = 0; reg < nitems(frame->tf_x); reg++) {
255 printf(" %sx%d: %16lx\n", (reg < 10) ? " " : "", reg,
258 printf(" sp: %16lx\n", frame->tf_sp);
259 printf(" lr: %16lx\n", frame->tf_lr);
260 printf(" elr: %16lx\n", frame->tf_elr);
261 printf("spsr: %8x\n", frame->tf_spsr);
265 do_el1h_sync(struct thread *td, struct trapframe *frame)
270 /* Read the esr register to get the exception details */
272 exception = ESR_ELx_EXCEPTION(esr);
275 if (dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, exception))
280 "do_el1_sync: curthread: %p, esr %lx, elr: %lx, frame: %p", td,
281 esr, frame->tf_elr, frame);
287 if ((td->td_pcb->pcb_fpflags & PCB_FP_KERN) != 0) {
292 print_registers(frame);
293 printf(" esr: %.8lx\n", esr);
294 panic("VFP exception in the kernel");
297 case EXCP_INSN_ABORT:
298 case EXCP_DATA_ABORT:
299 far = READ_SPECIALREG(far_el1);
301 data_abort(td, frame, esr, far, 0);
305 if ((esr & ESR_ELx_ISS_MASK) == 0x40d && \
306 dtrace_invop_jump_addr != 0) {
307 dtrace_invop_jump_addr(frame);
312 case EXCP_WATCHPT_EL1:
313 case EXCP_SOFTSTP_EL1:
315 kdb_trap(exception, 0, frame);
317 panic("No debugger in kernel.\n");
321 print_registers(frame);
322 panic("Unknown kernel exception %x esr_el1 %lx\n", exception,
328 * The attempted execution of an instruction bit pattern that has no allocated
329 * instruction results in an exception with an unknown reason.
332 el0_excp_unknown(struct trapframe *frame, uint64_t far)
337 call_trapsignal(td, SIGILL, ILL_ILLTRP, (void *)far);
342 do_el0_sync(struct thread *td, struct trapframe *frame)
347 /* Check we have a sane environment when entering from userland */
348 KASSERT((uintptr_t)get_pcpu() >= VM_MIN_KERNEL_ADDRESS,
349 ("Invalid pcpu address from userland: %p (tpidr %lx)",
350 get_pcpu(), READ_SPECIALREG(tpidr_el1)));
353 exception = ESR_ELx_EXCEPTION(esr);
356 case EXCP_INSN_ABORT_L:
357 case EXCP_DATA_ABORT_L:
358 case EXCP_DATA_ABORT:
359 far = READ_SPECIALREG(far_el1);
364 "do_el0_sync: curthread: %p, esr %lx, elr: %lx, frame: %p", td, esr,
365 frame->tf_elr, frame);
373 panic("VFP exception in userland");
377 svc_handler(td, frame);
379 case EXCP_INSN_ABORT_L:
380 case EXCP_DATA_ABORT_L:
381 case EXCP_DATA_ABORT:
382 data_abort(td, frame, esr, far, 1);
385 el0_excp_unknown(frame, far);
388 call_trapsignal(td, SIGBUS, BUS_ADRALN, (void *)frame->tf_sp);
392 call_trapsignal(td, SIGBUS, BUS_ADRALN, (void *)frame->tf_elr);
396 call_trapsignal(td, SIGTRAP, TRAP_BRKPT, (void *)frame->tf_elr);
400 call_trapsignal(td, SIGILL, ILL_PRVOPC, (void *)frame->tf_elr);
403 case EXCP_SOFTSTP_EL0:
404 td->td_frame->tf_spsr &= ~PSR_SS;
405 td->td_pcb->pcb_flags &= ~PCB_SINGLE_STEP;
406 WRITE_SPECIALREG(MDSCR_EL1,
407 READ_SPECIALREG(MDSCR_EL1) & ~DBG_MDSCR_SS);
408 call_trapsignal(td, SIGTRAP, TRAP_TRACE,
409 (void *)frame->tf_elr);
413 call_trapsignal(td, SIGBUS, BUS_OBJERR, (void *)frame->tf_elr);
418 KASSERT((td->td_pcb->pcb_fpflags & ~PCB_FP_USERMASK) == 0,
419 ("Kernel VFP flags set while entering userspace"));
421 td->td_pcb->pcb_fpusaved == &td->td_pcb->pcb_fpustate,
422 ("Kernel VFP state in use when entering userspace"));
426 do_el0_error(struct trapframe *frame)
429 panic("ARM64TODO: do_el0_error");