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>
59 int _ucodesel = GSEL(GUCODE_SEL, SEL_UPL);
60 int _udatasel = GSEL(GUDATA_SEL, SEL_UPL);
62 static void exc_segfault(int signo, siginfo_t *info, void *ctx);
64 static void exc_debugger(int signo, siginfo_t *info, void *ctx);
70 * IPIs are 'fast' interrupts, so we deal with them directly from our
73 * WARNING: Signals are not physically disabled here so we have to enter
74 * our critical section before bumping gd_intr_nesting_level or another
75 * interrupt can come along and get really confused.
79 ipisig(int nada, siginfo_t *info, void *ctxp)
81 globaldata_t gd = mycpu;
82 thread_t td = gd->gd_curthread;
84 if (td->td_critcount == 0) {
86 ++gd->gd_intr_nesting_level;
88 --gd->gd_intr_nesting_level;
96 * Unconditionally stop or restart a cpu.
98 * Note: cpu_mask_all_signals() masks all signals except SIGXCPU itself.
99 * SIGXCPU itself is blocked on entry to stopsig() by the signal handler
102 * WARNING: Signals are not physically disabled here so we have to enter
103 * our critical section before bumping gd_intr_nesting_level or another
104 * interrupt can come along and get really confused.
108 stopsig(int nada, siginfo_t *info, void *ctxp)
110 globaldata_t gd = mycpu;
111 thread_t td = gd->gd_curthread;
115 sigaddset(&ss, SIGALRM);
116 sigaddset(&ss, SIGIO);
117 sigaddset(&ss, SIGQUIT);
118 sigaddset(&ss, SIGUSR1);
119 sigaddset(&ss, SIGUSR2);
120 sigaddset(&ss, SIGTERM);
121 sigaddset(&ss, SIGWINCH);
124 ++gd->gd_intr_nesting_level;
125 while (stopped_cpus & gd->gd_cpumask) {
128 --gd->gd_intr_nesting_level;
137 * SIGIO is used by cothreads to signal back into the virtual kernel.
141 iosig(int nada, siginfo_t *info, void *ctxp)
149 init_exceptions(void)
153 bzero(&sa, sizeof(sa));
154 sa.sa_sigaction = exc_segfault;
155 sa.sa_flags |= SA_SIGINFO | SA_NODEFER;
156 sigemptyset(&sa.sa_mask);
157 sigaction(SIGBUS, &sa, NULL);
158 sigaction(SIGSEGV, &sa, NULL);
159 sigaction(SIGTRAP, &sa, NULL);
160 sigaction(SIGFPE, &sa, NULL);
163 sa.sa_sigaction = exc_debugger;
164 sigaction(SIGQUIT, &sa, NULL);
167 sa.sa_sigaction = ipisig;
168 sigaction(SIGUSR1, &sa, NULL);
169 sa.sa_sigaction = stopsig;
170 sigaction(SIGXCPU, &sa, NULL);
173 sa.sa_sigaction = iosig;
174 sigaction(SIGIO, &sa, NULL);
179 * This function handles a segmentation fault.
181 * XXX We assume that trapframe is a subset of ucontext. It is as of
185 exc_segfault(int signo, siginfo_t *info, void *ctxp)
187 ucontext_t *ctx = ctxp;
190 kprintf("CAUGHT SIG %d RIP %08lx ERR %08lx TRAPNO %ld "
191 "err %ld addr %08lx\n",
193 ctx->uc_mcontext.mc_rip,
194 ctx->uc_mcontext.mc_err,
195 ctx->uc_mcontext.mc_trapno & 0xFFFF,
196 ctx->uc_mcontext.mc_trapno >> 16,
197 ctx->uc_mcontext.mc_addr);
199 kern_trap((struct trapframe *)&ctx->uc_mcontext.mc_rdi);
206 exc_debugger(int signo, siginfo_t *info, void *ctx)
208 Debugger("interrupt from console");