3 * Copyright (c) 2006 The DragonFly Project. All rights reserved.
5 * This code is derived from software contributed to The DragonFly Project
6 * by Matthew Dillon <dillon@backplane.com>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * $DragonFly: src/sys/platform/vkernel/i386/exception.c,v 1.11 2008/04/28 07:05:09 dillon Exp $
39 #include <sys/types.h>
40 #include <sys/systm.h>
41 #include <sys/reboot.h>
42 #include <sys/kernel.h>
43 #include <sys/kthread.h>
44 #include <sys/reboot.h>
47 #include <sys/thread2.h>
49 #include <machine/trap.h>
50 #include <machine/md_var.h>
51 #include <machine/segments.h>
52 #include <machine/cpu.h>
53 #include <machine/smp.h>
60 int _ucodesel = LSEL(LUCODE_SEL, SEL_UPL);
61 int _udatasel = LSEL(LUDATA_SEL, SEL_UPL);
63 static void exc_segfault(int signo, siginfo_t *info, void *ctx);
65 static void exc_debugger(int signo, siginfo_t *info, void *ctx);
71 * IPIs are 'fast' interrupts, so we deal with them directly from our
74 * WARNING: Signals are not physically disabled here so we have to enter
75 * our critical section before bumping gd_intr_nesting_level or another
76 * interrupt can come along and get really confused.
80 ipisig(int nada, siginfo_t *info, void *ctxp)
82 if (curthread->td_critcount == 0) {
83 ++curthread->td_critcount;
84 ++mycpu->gd_intr_nesting_level;
86 --mycpu->gd_intr_nesting_level;
87 --curthread->td_critcount;
94 * Unconditionally stop or restart a cpu.
96 * Note: cpu_mask_all_signals() masks all signals except SIGXCPU itself.
97 * SIGXCPU itself is blocked on entry to stopsig() by the signal handler
100 * WARNING: Signals are not physically disabled here so we have to enter
101 * our critical section before bumping gd_intr_nesting_level or another
102 * interrupt can come along and get really confused.
106 stopsig(int nada, siginfo_t *info, void *ctxp)
111 sigaddset(&ss, SIGALRM);
112 sigaddset(&ss, SIGIO);
113 sigaddset(&ss, SIGQUIT);
114 sigaddset(&ss, SIGUSR1);
115 sigaddset(&ss, SIGUSR2);
116 sigaddset(&ss, SIGTERM);
117 sigaddset(&ss, SIGWINCH);
119 ++curthread->td_critcount;
120 ++mycpu->gd_intr_nesting_level;
121 while (stopped_cpus & mycpu->gd_cpumask) {
124 --mycpu->gd_intr_nesting_level;
125 --curthread->td_critcount;
133 * SIGIO is used by cothreads to signal back into the virtual kernel.
137 iosig(int nada, siginfo_t *info, void *ctxp)
146 infosig(int nada, siginfo_t *info, void *ctxp)
148 ucontext_t *ctx = ctxp;
151 snprintf(buf, sizeof(buf), "lwp %d pc=%p sp=%p\n",
153 (void *)(intptr_t)ctx->uc_mcontext.mc_eip,
154 (void *)(intptr_t)ctx->uc_mcontext.mc_esp);
155 write(2, buf, strlen(buf));
159 init_exceptions(void)
163 bzero(&sa, sizeof(sa));
164 sa.sa_sigaction = exc_segfault;
165 sa.sa_flags |= SA_SIGINFO | SA_NODEFER;
166 sigemptyset(&sa.sa_mask);
167 sigaction(SIGBUS, &sa, NULL);
168 sigaction(SIGSEGV, &sa, NULL);
169 sigaction(SIGTRAP, &sa, NULL);
170 sigaction(SIGFPE, &sa, NULL);
172 sa.sa_flags &= ~SA_NODEFER;
175 sa.sa_sigaction = exc_debugger;
176 sigaction(SIGQUIT, &sa, NULL);
179 sa.sa_sigaction = ipisig;
180 sigaction(SIGUSR1, &sa, NULL);
181 sa.sa_sigaction = stopsig;
182 sigaction(SIGXCPU, &sa, NULL);
185 sa.sa_sigaction = iosig;
186 sigaction(SIGIO, &sa, NULL);
188 sa.sa_sigaction = infosig;
189 sigaction(SIGINFO, &sa, NULL);
193 * This function handles a segmentation fault.
195 * XXX We assume that trapframe is a subset of ucontext. It is as of
199 exc_segfault(int signo, siginfo_t *info, void *ctxp)
201 ucontext_t *ctx = ctxp;
204 kprintf("CAUGHT SEGFAULT EIP %08x ERR %08x TRAPNO %d err %d\n",
205 ctx->uc_mcontext.mc_eip,
206 ctx->uc_mcontext.mc_err,
207 ctx->uc_mcontext.mc_trapno & 0xFFFF,
208 ctx->uc_mcontext.mc_trapno >> 16);
210 kern_trap((struct trapframe *)&ctx->uc_mcontext.mc_gs);
217 exc_debugger(int signo, siginfo_t *info, void *ctx)
219 Debugger("interrupt from console");