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>
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 (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("TODO: Could we have more then %d args?", NARGREG);
124 td->td_retval[0] = 0;
125 td->td_retval[1] = 0;
130 #include "../../kern/subr_syscall.c"
133 dump_regs(struct trapframe *frame)
138 n = (sizeof(frame->tf_t) / sizeof(frame->tf_t[0]));
139 for (i = 0; i < n; i++)
140 printf("t[%d] == 0x%016lx\n", i, frame->tf_t[i]);
142 n = (sizeof(frame->tf_s) / sizeof(frame->tf_s[0]));
143 for (i = 0; i < n; i++)
144 printf("s[%d] == 0x%016lx\n", i, frame->tf_s[i]);
146 n = (sizeof(frame->tf_a) / sizeof(frame->tf_a[0]));
147 for (i = 0; i < n; i++)
148 printf("a[%d] == 0x%016lx\n", i, frame->tf_a[i]);
150 printf("ra == 0x%016lx\n", frame->tf_ra);
151 printf("sp == 0x%016lx\n", frame->tf_sp);
152 printf("gp == 0x%016lx\n", frame->tf_gp);
153 printf("tp == 0x%016lx\n", frame->tf_tp);
155 printf("sepc == 0x%016lx\n", frame->tf_sepc);
156 printf("sstatus == 0x%016lx\n", frame->tf_sstatus);
160 svc_handler(struct trapframe *frame)
165 td->td_frame = frame;
172 data_abort(struct trapframe *frame, int usermode)
181 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 map = &td->td_proc->p_vmspace->vm_map;
202 else if (stval >= VM_MAX_USER_ADDRESS)
205 if (pcb->pcb_onfault == 0)
207 map = &td->td_proc->p_vmspace->vm_map;
210 va = trunc_page(stval);
212 if ((frame->tf_scause == EXCP_FAULT_STORE) ||
213 (frame->tf_scause == EXCP_STORE_PAGE_FAULT)) {
214 ftype = VM_PROT_WRITE;
215 } else if (frame->tf_scause == EXCP_INST_PAGE_FAULT) {
216 ftype = VM_PROT_EXECUTE;
218 ftype = VM_PROT_READ;
221 if (pmap_fault_fixup(map->pmap, va, ftype))
224 error = vm_fault_trap(map, va, ftype, VM_FAULT_NORMAL, &sig, &ucode);
225 if (error != KERN_SUCCESS) {
227 call_trapsignal(td, sig, ucode, (void *)stval);
229 if (pcb->pcb_onfault != 0) {
230 frame->tf_a[0] = error;
231 frame->tf_sepc = pcb->pcb_onfault;
245 panic("Fatal page fault at %#lx: %#016lx", frame->tf_sepc, stval);
249 do_trap_supervisor(struct trapframe *frame)
253 /* Ensure we came from supervisor mode, interrupts disabled */
254 KASSERT((csr_read(sstatus) & (SSTATUS_SPP | SSTATUS_SIE)) ==
255 SSTATUS_SPP, ("Came from S mode with interrupts enabled"));
257 exception = (frame->tf_scause & EXCP_MASK);
258 if (frame->tf_scause & EXCP_INTR) {
260 riscv_cpu_intr(frame);
265 if (dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, exception))
269 CTR3(KTR_TRAP, "do_trap_supervisor: curthread: %p, sepc: %lx, frame: %p",
270 curthread, frame->tf_sepc, frame);
273 case EXCP_FAULT_LOAD:
274 case EXCP_FAULT_STORE:
275 case EXCP_FAULT_FETCH:
276 case EXCP_STORE_PAGE_FAULT:
277 case EXCP_LOAD_PAGE_FAULT:
278 data_abort(frame, 0);
280 case EXCP_BREAKPOINT:
282 if (dtrace_invop_jump_addr != NULL &&
283 dtrace_invop_jump_addr(frame) == 0)
287 kdb_trap(exception, 0, frame);
290 panic("No debugger in kernel.\n");
293 case EXCP_ILLEGAL_INSTRUCTION:
295 panic("Illegal instruction at 0x%016lx\n", frame->tf_sepc);
299 panic("Unknown kernel exception %x trap value %lx\n",
300 exception, frame->tf_stval);
305 do_trap_user(struct trapframe *frame)
312 td->td_frame = frame;
315 /* Ensure we came from usermode, interrupts disabled */
316 KASSERT((csr_read(sstatus) & (SSTATUS_SPP | SSTATUS_SIE)) == 0,
317 ("Came from U mode with interrupts enabled"));
319 exception = (frame->tf_scause & EXCP_MASK);
320 if (frame->tf_scause & EXCP_INTR) {
322 riscv_cpu_intr(frame);
326 CTR3(KTR_TRAP, "do_trap_user: curthread: %p, sepc: %lx, frame: %p",
327 curthread, frame->tf_sepc, frame);
330 case EXCP_FAULT_LOAD:
331 case EXCP_FAULT_STORE:
332 case EXCP_FAULT_FETCH:
333 case EXCP_STORE_PAGE_FAULT:
334 case EXCP_LOAD_PAGE_FAULT:
335 case EXCP_INST_PAGE_FAULT:
336 data_abort(frame, 1);
338 case EXCP_USER_ECALL:
339 frame->tf_sepc += 4; /* Next instruction */
342 case EXCP_ILLEGAL_INSTRUCTION:
344 if ((pcb->pcb_fpflags & PCB_FP_STARTED) == 0) {
346 * May be a FPE trap. Enable FPE usage
347 * for this thread and try again.
350 frame->tf_sstatus &= ~SSTATUS_FS_MASK;
351 frame->tf_sstatus |= SSTATUS_FS_CLEAN;
352 pcb->pcb_fpflags |= PCB_FP_STARTED;
356 call_trapsignal(td, SIGILL, ILL_ILLTRP, (void *)frame->tf_sepc);
359 case EXCP_BREAKPOINT:
360 call_trapsignal(td, SIGTRAP, TRAP_BRKPT, (void *)frame->tf_sepc);
365 panic("Unknown userland exception %x, trap value %lx\n",
366 exception, frame->tf_stval);