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 1.5 2007/01/15 05:27:29 dillon Exp $
39 #include <sys/types.h>
40 #include <sys/systm.h>
41 #include <sys/kernel.h>
44 #include <sys/thread2.h>
46 #include <machine/trap.h>
47 #include <machine/md_var.h>
48 #include <machine/segments.h>
51 int _ucodesel = LSEL(LUCODE_SEL, SEL_UPL);
52 int _udatasel = LSEL(LUDATA_SEL, SEL_UPL);
54 static void exc_segfault(int signo, siginfo_t *info, void *ctx);
56 static void exc_debugger(int signo, siginfo_t *info, void *ctx);
64 bzero(&sa, sizeof(sa));
65 sa.sa_sigaction = exc_segfault;
66 sa.sa_flags |= SA_SIGINFO;
67 sigemptyset(&sa.sa_mask);
68 sigaction(SIGSEGV, &sa, NULL);
69 sigaction(SIGTRAP, &sa, NULL);
71 sa.sa_sigaction = exc_debugger;
72 sigaction(SIGQUIT, &sa, NULL);
77 * This function handles a segmentation fault.
79 * XXX We assume that trapframe is a subset of ucontext. It is as of
83 exc_segfault(int signo, siginfo_t *info, void *ctxp)
85 ucontext_t *ctx = ctxp;
88 kprintf("CAUGHT SEGFAULT EIP %08x ERR %08x TRAPNO %d err %d\n",
89 ctx->uc_mcontext.mc_eip,
90 ctx->uc_mcontext.mc_err,
91 ctx->uc_mcontext.mc_trapno & 0xFFFF,
92 ctx->uc_mcontext.mc_trapno >> 16);
94 kern_trap((struct trapframe *)&ctx->uc_mcontext.mc_gs);
101 exc_debugger(int signo, siginfo_t *info, void *ctx)
103 Debugger("interrupt from console");