1 /*
2 * Copyright (c) 2003, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "memory/filemap.hpp"
27 #include "runtime/arguments.hpp"
28 #include "runtime/os.hpp"
29 #include "runtime/thread.hpp"
30 #include "utilities/vmError.hpp"
31
32 #include <sys/types.h>
33 #include <sys/wait.h>
34 #include <signal.h>
35
36 #ifdef LINUX
37 #include <sys/syscall.h>
38 #include <unistd.h>
39 #endif
40 #ifdef SOLARIS
41 #include <thread.h>
42 #endif
43 #ifdef AIX
44 #include <unistd.h>
45 #endif
46 #ifdef BSD
47 #include <sys/syscall.h>
48 #include <unistd.h>
49 #endif
50
51
52 // handle all synchronous program error signals which may happen during error
53 // reporting. They must be unblocked, caught, handled.
54
55 static const int SIGNALS[] = { SIGSEGV, SIGBUS, SIGILL, SIGFPE, SIGTRAP }; // add more if needed
56 static const int NUM_SIGNALS = sizeof(SIGNALS) / sizeof(int);
57
58 // Space for our "saved" signal flags and handlers
59 static int resettedSigflags[NUM_SIGNALS];
60 static address resettedSighandler[NUM_SIGNALS];
61
62 static void save_signal(int idx, int sig)
63 {
64 struct sigaction sa;
65 sigaction(sig, NULL, &sa);
66 resettedSigflags[idx] = sa.sa_flags;
67 resettedSighandler[idx] = (sa.sa_flags & SA_SIGINFO)
68 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction)
69 : CAST_FROM_FN_PTR(address, sa.sa_handler);
70 }
71
72 int VMError::get_resetted_sigflags(int sig) {
73 for (int i = 0; i < NUM_SIGNALS; i++) {
74 if (SIGNALS[i] == sig) {
75 return resettedSigflags[i];
76 }
77 }
78 return -1;
79 }
80
81 address VMError::get_resetted_sighandler(int sig) {
82 for (int i = 0; i < NUM_SIGNALS; i++) {
83 if (SIGNALS[i] == sig) {
84 return resettedSighandler[i];
85 }
86 }
87 return NULL;
88 }
89
90 static void crash_handler(int sig, siginfo_t* info, void* ucVoid) {
91 // unmask current signal
92 sigset_t newset;
93 sigemptyset(&newset);
94 sigaddset(&newset, sig);
95 // also unmask other synchronous signals
96 for (int i = 0; i < NUM_SIGNALS; i++) {
97 sigaddset(&newset, SIGNALS[i]);
98 }
99 os::Posix::unblock_thread_signal_mask(&newset);
100
101 // support safefetch faults in error handling
102 ucontext_t* const uc = (ucontext_t*) ucVoid;
103 address const pc = uc ? os::Posix::ucontext_get_pc(uc) : NULL;
104
105 if (uc && pc && StubRoutines::is_safefetch_fault(pc)) {
106 os::Posix::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc));
107 return;
108 }
109
110 VMError::report_and_die(NULL, sig, pc, info, ucVoid);
111 }
112
113 void VMError::reset_signal_handlers() {
114 // install signal handlers for all synchronous program error signals
115 sigset_t newset;
116 sigemptyset(&newset);
117
118 for (int i = 0; i < NUM_SIGNALS; i++) {
119 save_signal(i, SIGNALS[i]);
120 os::signal(SIGNALS[i], CAST_FROM_FN_PTR(void *, crash_handler));
121 sigaddset(&newset, SIGNALS[i]);
122 }
123 os::Posix::unblock_thread_signal_mask(&newset);
124
125 }
126
127 // Write a hint to the stream in case siginfo relates to a segv/bus error
128 // and the offending address points into CDS archive.
129 void VMError::check_failing_cds_access(outputStream* st, const void* siginfo) {
130 if (siginfo && UseSharedSpaces) {
131 const siginfo_t* const si = (siginfo_t*)siginfo;
132 if (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) {
133 const void* const fault_addr = si->si_addr;
134 if (fault_addr != NULL) {
135 FileMapInfo* const mapinfo = FileMapInfo::current_info();
136 if (mapinfo->is_in_shared_space(fault_addr)) {
137 st->print("Error accessing class data sharing archive. "
138 "Mapped file inaccessible during execution, possible disk/network problem.");
139 }
140 }
141 }
142 }
143 }
144