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>
42 #include <sys/mutex.h>
43 #include <sys/pioctl.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>
61 #include <machine/fpe.h>
63 #include <machine/frame.h>
64 #include <machine/pcb.h>
65 #include <machine/pcpu.h>
67 #include <machine/resource.h>
68 #include <machine/intr.h>
71 #include <sys/dtrace_bsd.h>
74 int (*dtrace_invop_jump_addr)(struct trapframe *);
76 extern register_t fsu_intr_fault;
78 /* Called from exception.S */
79 void do_trap_supervisor(struct trapframe *);
80 void do_trap_user(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)
99 struct syscall_args *sa;
105 ap = &td->td_frame->tf_a[0];
107 sa->code = td->td_frame->tf_t[0];
109 if (sa->code == SYS_syscall || sa->code == SYS___syscall) {
114 if (p->p_sysent->sv_mask)
115 sa->code &= p->p_sysent->sv_mask;
116 if (sa->code >= p->p_sysent->sv_size)
117 sa->callp = &p->p_sysent->sv_table[0];
119 sa->callp = &p->p_sysent->sv_table[sa->code];
121 sa->narg = sa->callp->sy_narg;
122 memcpy(sa->args, ap, nap * sizeof(register_t));
124 panic("TODO: Could we have more then %d args?", NARGREG);
126 td->td_retval[0] = 0;
127 td->td_retval[1] = 0;
132 #include "../../kern/subr_syscall.c"
135 dump_regs(struct trapframe *frame)
140 n = (sizeof(frame->tf_t) / sizeof(frame->tf_t[0]));
141 for (i = 0; i < n; i++)
142 printf("t[%d] == 0x%016lx\n", i, frame->tf_t[i]);
144 n = (sizeof(frame->tf_s) / sizeof(frame->tf_s[0]));
145 for (i = 0; i < n; i++)
146 printf("s[%d] == 0x%016lx\n", i, frame->tf_s[i]);
148 n = (sizeof(frame->tf_a) / sizeof(frame->tf_a[0]));
149 for (i = 0; i < n; i++)
150 printf("a[%d] == 0x%016lx\n", i, frame->tf_a[i]);
152 printf("sepc == 0x%016lx\n", frame->tf_sepc);
153 printf("sstatus == 0x%016lx\n", frame->tf_sstatus);
157 svc_handler(struct trapframe *frame)
163 td->td_frame = frame;
165 error = syscallenter(td);
166 syscallret(td, error);
170 data_abort(struct trapframe *frame, int usermode)
179 int error, sig, ucode;
191 sbadaddr = frame->tf_sbadaddr;
193 if (td->td_critnest != 0 || td->td_intr_nesting_level != 0 ||
194 WITNESS_CHECK(WARN_SLEEPOK | WARN_GIANTOK, NULL,
195 "Kernel page fault") != 0)
199 map = &td->td_proc->p_vmspace->vm_map;
200 else if (sbadaddr >= VM_MAX_USER_ADDRESS)
203 if (pcb->pcb_onfault == 0)
205 map = &td->td_proc->p_vmspace->vm_map;
208 va = trunc_page(sbadaddr);
210 if ((frame->tf_scause == EXCP_FAULT_STORE) ||
211 (frame->tf_scause == EXCP_STORE_PAGE_FAULT)) {
212 ftype = VM_PROT_WRITE;
213 } else if (frame->tf_scause == EXCP_INST_PAGE_FAULT) {
214 ftype = VM_PROT_EXECUTE;
216 ftype = VM_PROT_READ;
219 if (pmap_fault_fixup(map->pmap, va, ftype))
222 if (map != kernel_map) {
224 * Keep swapout from messing with us during this
231 /* Fault in the user page: */
232 error = vm_fault(map, va, ftype, VM_FAULT_NORMAL);
239 * Don't have to worry about process locking or stacks in the
242 error = vm_fault(map, va, ftype, VM_FAULT_NORMAL);
245 if (error != KERN_SUCCESS) {
248 if (error == KERN_PROTECTION_FAILURE)
252 call_trapsignal(td, sig, ucode, (void *)sbadaddr);
254 if (pcb->pcb_onfault != 0) {
255 frame->tf_a[0] = error;
256 frame->tf_sepc = pcb->pcb_onfault;
270 panic("Fatal page fault at %#lx: %#016lx", frame->tf_sepc, sbadaddr);
274 do_trap_supervisor(struct trapframe *frame)
279 /* Ensure we came from supervisor mode, interrupts disabled */
280 __asm __volatile("csrr %0, sstatus" : "=&r" (sstatus));
281 KASSERT((sstatus & (SSTATUS_SPP | SSTATUS_SIE)) == SSTATUS_SPP,
282 ("We must came from S mode with interrupts disabled"));
284 exception = (frame->tf_scause & EXCP_MASK);
285 if (frame->tf_scause & EXCP_INTR) {
287 riscv_cpu_intr(frame);
292 if (dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, exception))
296 CTR3(KTR_TRAP, "do_trap_supervisor: curthread: %p, sepc: %lx, frame: %p",
297 curthread, frame->tf_sepc, frame);
300 case EXCP_FAULT_LOAD:
301 case EXCP_FAULT_STORE:
302 case EXCP_FAULT_FETCH:
303 case EXCP_STORE_PAGE_FAULT:
304 case EXCP_LOAD_PAGE_FAULT:
305 data_abort(frame, 0);
307 case EXCP_BREAKPOINT:
309 if (dtrace_invop_jump_addr != 0) {
310 dtrace_invop_jump_addr(frame);
315 kdb_trap(exception, 0, frame);
318 panic("No debugger in kernel.\n");
321 case EXCP_ILLEGAL_INSTRUCTION:
323 panic("Illegal instruction at 0x%016lx\n", frame->tf_sepc);
327 panic("Unknown kernel exception %x badaddr %lx\n",
328 exception, frame->tf_sbadaddr);
333 do_trap_user(struct trapframe *frame)
341 td->td_frame = frame;
344 /* Ensure we came from usermode, interrupts disabled */
345 __asm __volatile("csrr %0, sstatus" : "=&r" (sstatus));
346 KASSERT((sstatus & (SSTATUS_SPP | SSTATUS_SIE)) == 0,
347 ("We must came from U mode with interrupts disabled"));
349 exception = (frame->tf_scause & EXCP_MASK);
350 if (frame->tf_scause & EXCP_INTR) {
352 riscv_cpu_intr(frame);
356 CTR3(KTR_TRAP, "do_trap_user: curthread: %p, sepc: %lx, frame: %p",
357 curthread, frame->tf_sepc, frame);
360 case EXCP_FAULT_LOAD:
361 case EXCP_FAULT_STORE:
362 case EXCP_FAULT_FETCH:
363 case EXCP_STORE_PAGE_FAULT:
364 case EXCP_LOAD_PAGE_FAULT:
365 case EXCP_INST_PAGE_FAULT:
366 data_abort(frame, 1);
368 case EXCP_USER_ECALL:
369 frame->tf_sepc += 4; /* Next instruction */
372 case EXCP_ILLEGAL_INSTRUCTION:
374 if ((pcb->pcb_fpflags & PCB_FP_STARTED) == 0) {
376 * May be a FPE trap. Enable FPE usage
377 * for this thread and try again.
380 frame->tf_sstatus &= ~SSTATUS_FS_MASK;
381 frame->tf_sstatus |= SSTATUS_FS_CLEAN;
382 pcb->pcb_fpflags |= PCB_FP_STARTED;
386 call_trapsignal(td, SIGILL, ILL_ILLTRP, (void *)frame->tf_sepc);
389 case EXCP_BREAKPOINT:
390 call_trapsignal(td, SIGTRAP, TRAP_BRKPT, (void *)frame->tf_sepc);
395 panic("Unknown userland exception %x, badaddr %lx\n",
396 exception, frame->tf_sbadaddr);