2 * Copyright (c) 2015-2018 Ruslan Bukin <br@bsdpad.com>
5 * Portions of this software were developed by SRI International and the
6 * University of Cambridge Computer Laboratory under DARPA/AFRL contract
7 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
9 * Portions of this software were developed by the University of Cambridge
10 * Computer Laboratory as part of the CTSRD Project, with support from the
11 * UK Higher Education Innovation Fund (HEIF).
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/kernel.h>
43 #include <sys/mutex.h>
46 #include <sys/ptrace.h>
47 #include <sys/syscall.h>
48 #include <sys/sysent.h>
55 #include <vm/vm_kern.h>
56 #include <vm/vm_map.h>
57 #include <vm/vm_param.h>
58 #include <vm/vm_extern.h>
60 #include <machine/fpe.h>
61 #include <machine/frame.h>
62 #include <machine/pcb.h>
63 #include <machine/pcpu.h>
65 #include <machine/resource.h>
66 #include <machine/intr.h>
69 #include <sys/dtrace_bsd.h>
72 int (*dtrace_invop_jump_addr)(struct trapframe *);
74 /* Called from exception.S */
75 void do_trap_supervisor(struct trapframe *);
76 void do_trap_user(struct trapframe *);
79 call_trapsignal(struct thread *td, int sig, int code, void *addr, int trapno)
83 ksiginfo_init_trap(&ksi);
87 ksi.ksi_trapno = trapno;
92 cpu_fetch_syscall_args(struct thread *td)
95 syscallarg_t *ap, *dst_ap;
96 struct syscall_args *sa;
100 ap = &td->td_frame->tf_a[0];
101 dst_ap = &sa->args[0];
103 sa->code = td->td_frame->tf_t[0];
104 sa->original_code = sa->code;
106 if (__predict_false(sa->code == SYS_syscall || sa->code == SYS___syscall)) {
112 if (__predict_false(sa->code >= p->p_sysent->sv_size))
113 sa->callp = &p->p_sysent->sv_table[0];
115 sa->callp = &p->p_sysent->sv_table[sa->code];
117 KASSERT(sa->callp->sy_narg <= nitems(sa->args),
118 ("Syscall %d takes too many arguments", sa->code));
120 memcpy(dst_ap, ap, (NARGREG - 1) * sizeof(*dst_ap));
122 td->td_retval[0] = 0;
123 td->td_retval[1] = 0;
128 #include "../../kern/subr_syscall.c"
131 dump_regs(struct trapframe *frame)
136 n = nitems(frame->tf_t);
137 for (i = 0; i < n; i++)
138 printf("t[%d] == 0x%016lx\n", i, frame->tf_t[i]);
140 n = nitems(frame->tf_s);
141 for (i = 0; i < n; i++)
142 printf("s[%d] == 0x%016lx\n", i, frame->tf_s[i]);
144 n = nitems(frame->tf_a);
145 for (i = 0; i < n; i++)
146 printf("a[%d] == 0x%016lx\n", i, frame->tf_a[i]);
148 printf("ra == 0x%016lx\n", frame->tf_ra);
149 printf("sp == 0x%016lx\n", frame->tf_sp);
150 printf("gp == 0x%016lx\n", frame->tf_gp);
151 printf("tp == 0x%016lx\n", frame->tf_tp);
153 printf("sepc == 0x%016lx\n", frame->tf_sepc);
154 printf("sstatus == 0x%016lx\n", frame->tf_sstatus);
169 page_fault_handler(struct trapframe *frame, int usermode)
178 int error, sig, ucode;
193 stval = frame->tf_stval;
195 if (td->td_critnest != 0 || td->td_intr_nesting_level != 0 ||
196 WITNESS_CHECK(WARN_SLEEPOK | WARN_GIANTOK, NULL,
197 "Kernel page fault") != 0)
201 if (!VIRT_IS_VALID(stval)) {
202 call_trapsignal(td, SIGSEGV, SEGV_MAPERR, (void *)stval,
203 frame->tf_scause & SCAUSE_CODE);
206 map = &p->p_vmspace->vm_map;
209 * Enable interrupts for the duration of the page fault. For
210 * user faults this was done already in do_trap_user().
214 if (stval >= VM_MIN_KERNEL_ADDRESS) {
217 if (pcb->pcb_onfault == 0)
219 map = &p->p_vmspace->vm_map;
223 va = trunc_page(stval);
225 if (frame->tf_scause == SCAUSE_STORE_PAGE_FAULT) {
226 ftype = VM_PROT_WRITE;
227 } else if (frame->tf_scause == SCAUSE_INST_PAGE_FAULT) {
228 ftype = VM_PROT_EXECUTE;
230 ftype = VM_PROT_READ;
233 if (VIRT_IS_VALID(va) && pmap_fault(map->pmap, va, ftype))
236 error = vm_fault_trap(map, va, ftype, VM_FAULT_NORMAL, &sig, &ucode);
237 if (error != KERN_SUCCESS) {
239 call_trapsignal(td, sig, ucode, (void *)stval,
240 frame->tf_scause & SCAUSE_CODE);
242 if (pcb->pcb_onfault != 0) {
243 frame->tf_a[0] = error;
244 frame->tf_sepc = pcb->pcb_onfault;
259 if (debugger_on_trap) {
260 kdb_why = KDB_WHY_TRAP;
261 handled = kdb_trap(frame->tf_scause & SCAUSE_CODE, 0, frame);
262 kdb_why = KDB_WHY_UNSET;
267 panic("Fatal page fault at %#lx: %#016lx", frame->tf_sepc, stval);
271 do_trap_supervisor(struct trapframe *frame)
275 /* Ensure we came from supervisor mode, interrupts disabled */
276 KASSERT((csr_read(sstatus) & (SSTATUS_SPP | SSTATUS_SIE)) ==
277 SSTATUS_SPP, ("Came from S mode with interrupts enabled"));
279 KASSERT((csr_read(sstatus) & (SSTATUS_SUM)) == 0,
280 ("Came from S mode with SUM enabled"));
282 exception = frame->tf_scause & SCAUSE_CODE;
283 if ((frame->tf_scause & SCAUSE_INTR) != 0) {
285 riscv_cpu_intr(frame);
290 if (dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, exception))
294 CTR3(KTR_TRAP, "do_trap_supervisor: curthread: %p, sepc: %lx, frame: %p",
295 curthread, frame->tf_sepc, frame);
298 case SCAUSE_LOAD_ACCESS_FAULT:
299 case SCAUSE_STORE_ACCESS_FAULT:
300 case SCAUSE_INST_ACCESS_FAULT:
302 panic("Memory access exception at 0x%016lx\n", frame->tf_sepc);
304 case SCAUSE_LOAD_MISALIGNED:
305 case SCAUSE_STORE_MISALIGNED:
306 case SCAUSE_INST_MISALIGNED:
308 panic("Misaligned address exception at %#016lx: %#016lx\n",
309 frame->tf_sepc, frame->tf_stval);
311 case SCAUSE_STORE_PAGE_FAULT:
312 case SCAUSE_LOAD_PAGE_FAULT:
313 case SCAUSE_INST_PAGE_FAULT:
314 page_fault_handler(frame, 0);
316 case SCAUSE_BREAKPOINT:
318 if (dtrace_invop_jump_addr != NULL &&
319 dtrace_invop_jump_addr(frame) == 0)
323 kdb_trap(exception, 0, frame);
326 panic("No debugger in kernel.\n");
329 case SCAUSE_ILLEGAL_INSTRUCTION:
331 panic("Illegal instruction at 0x%016lx\n", frame->tf_sepc);
335 panic("Unknown kernel exception %lx trap value %lx\n",
336 exception, frame->tf_stval);
341 do_trap_user(struct trapframe *frame)
350 KASSERT(td->td_frame == frame,
351 ("%s: td_frame %p != frame %p", __func__, td->td_frame, frame));
353 /* Ensure we came from usermode, interrupts disabled */
354 KASSERT((csr_read(sstatus) & (SSTATUS_SPP | SSTATUS_SIE)) == 0,
355 ("Came from U mode with interrupts enabled"));
357 KASSERT((csr_read(sstatus) & (SSTATUS_SUM)) == 0,
358 ("Came from U mode with SUM enabled"));
360 exception = frame->tf_scause & SCAUSE_CODE;
361 if ((frame->tf_scause & SCAUSE_INTR) != 0) {
363 riscv_cpu_intr(frame);
368 CTR3(KTR_TRAP, "do_trap_user: curthread: %p, sepc: %lx, frame: %p",
369 curthread, frame->tf_sepc, frame);
372 case SCAUSE_LOAD_ACCESS_FAULT:
373 case SCAUSE_STORE_ACCESS_FAULT:
374 case SCAUSE_INST_ACCESS_FAULT:
375 call_trapsignal(td, SIGBUS, BUS_ADRERR, (void *)frame->tf_sepc,
379 case SCAUSE_LOAD_MISALIGNED:
380 case SCAUSE_STORE_MISALIGNED:
381 case SCAUSE_INST_MISALIGNED:
382 call_trapsignal(td, SIGBUS, BUS_ADRALN, (void *)frame->tf_sepc,
386 case SCAUSE_STORE_PAGE_FAULT:
387 case SCAUSE_LOAD_PAGE_FAULT:
388 case SCAUSE_INST_PAGE_FAULT:
389 page_fault_handler(frame, 1);
391 case SCAUSE_ECALL_USER:
392 frame->tf_sepc += 4; /* Next instruction */
395 case SCAUSE_ILLEGAL_INSTRUCTION:
396 if ((pcb->pcb_fpflags & PCB_FP_STARTED) == 0) {
398 * May be a FPE trap. Enable FPE usage
399 * for this thread and try again.
402 frame->tf_sstatus &= ~SSTATUS_FS_MASK;
403 frame->tf_sstatus |= SSTATUS_FS_CLEAN;
404 pcb->pcb_fpflags |= PCB_FP_STARTED;
407 call_trapsignal(td, SIGILL, ILL_ILLTRP, (void *)frame->tf_sepc,
411 case SCAUSE_BREAKPOINT:
412 call_trapsignal(td, SIGTRAP, TRAP_BRKPT, (void *)frame->tf_sepc,
418 panic("Unknown userland exception %lx, trap value %lx\n",
419 exception, frame->tf_stval);