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 1.7 2007/07/01 02:51:43 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>
58 int _ucodesel = LSEL(LUCODE_SEL, SEL_UPL);
59 int _udatasel = LSEL(LUDATA_SEL, SEL_UPL);
61 static void exc_segfault(int signo, siginfo_t *info, void *ctx);
63 static void exc_debugger(int signo, siginfo_t *info, void *ctx);
67 * IPIs are 'fast' interrupts, so we deal with them directly from our
72 ipi(int nada, siginfo_t *info, void *ctxp)
74 ++mycpu->gd_intr_nesting_level;
75 if (curthread->td_pri < TDPRI_CRIT) {
76 curthread->td_pri += TDPRI_CRIT;
78 curthread->td_pri -= TDPRI_CRIT;
82 --mycpu->gd_intr_nesting_level;
90 bzero(&sa, sizeof(sa));
91 sa.sa_sigaction = exc_segfault;
92 sa.sa_flags |= SA_SIGINFO;
93 sigemptyset(&sa.sa_mask);
94 sigaction(SIGSEGV, &sa, NULL);
95 sigaction(SIGTRAP, &sa, NULL);
98 sa.sa_sigaction = exc_debugger;
99 sigaction(SIGQUIT, &sa, NULL);
102 sa.sa_sigaction = ipi;
103 if (sigaction(SIGUSR1, &sa, NULL) != 0)
105 warn("ipi handler setup failed");
106 panic("IPI setup failed");
111 * This function handles a segmentation fault.
113 * XXX We assume that trapframe is a subset of ucontext. It is as of
117 exc_segfault(int signo, siginfo_t *info, void *ctxp)
119 ucontext_t *ctx = ctxp;
122 kprintf("CAUGHT SEGFAULT EIP %08x ERR %08x TRAPNO %d err %d\n",
123 ctx->uc_mcontext.mc_eip,
124 ctx->uc_mcontext.mc_err,
125 ctx->uc_mcontext.mc_trapno & 0xFFFF,
126 ctx->uc_mcontext.mc_trapno >> 16);
128 kern_trap((struct trapframe *)&ctx->uc_mcontext.mc_gs);
135 exc_debugger(int signo, siginfo_t *info, void *ctx)
137 Debugger("interrupt from console");