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omrsignal.c
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omrsignal.c
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/*******************************************************************************
* Copyright (c) 1991, 2021 IBM Corp. and others
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at https://www.eclipse.org/legal/epl-2.0/
* or the Apache License, Version 2.0 which accompanies this distribution and
* is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following
* Secondary Licenses when the conditions for such availability set
* forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
* General Public License, version 2 with the GNU Classpath
* Exception [1] and GNU General Public License, version 2 with the
* OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] http://openjdk.java.net/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
#include <windows.h>
#include <stdlib.h>
#include "omrport.h"
#include "omrthread.h"
#include "omrsignal.h"
#include "omrutil.h"
#include "omrutilbase.h"
#include "ut_omrport.h"
#if defined(OMRPORT_OMRSIG_SUPPORT)
#include "omrsig.h"
#endif /* defined(OMRPORT_OMRSIG_SUPPORT) */
typedef struct OMRWin32AsyncHandlerRecord {
OMRPortLibrary *portLib;
omrsig_handler_fn handler;
void *handler_arg;
uint32_t flags;
struct OMRWin32AsyncHandlerRecord *next;
} OMRWin32AsyncHandlerRecord;
static struct {
uint32_t portLibSignalNo;
int osSignalNo;
} signalMap[] = {
{OMRPORT_SIG_FLAG_SIGSEGV, SIGSEGV},
{OMRPORT_SIG_FLAG_SIGILL, SIGILL},
{OMRPORT_SIG_FLAG_SIGFPE, SIGFPE},
{OMRPORT_SIG_FLAG_SIGABRT, SIGABRT},
{OMRPORT_SIG_FLAG_SIGTERM, SIGTERM},
{OMRPORT_SIG_FLAG_SIGINT, SIGINT},
{OMRPORT_SIG_FLAG_SIGQUIT, SIGBREAK},
};
#define ARRAY_SIZE_SIGNALS (NSIG + 1)
typedef void (*win_signal)(int);
/* Store the original signal handler. During shutdown, we need to restore
* the signal handler to the original OS handler.
*/
static struct {
win_signal originalHandler;
uint32_t restore;
} handlerInfo[ARRAY_SIZE_SIGNALS];
/* Keep track of signal counts. */
static volatile uintptr_t signalCounts[ARRAY_SIZE_SIGNALS] = {0};
/* Thread to invoke signal handlers for asynchronous signals. */
static omrthread_t asynchSignalReporterThread;
static OMRWin32AsyncHandlerRecord *asyncHandlerList;
static omrthread_monitor_t asyncMonitor;
static uint32_t asyncThreadCount;
static uint32_t attachedPortLibraries;
/* holds the options set by omrsig_set_options */
static uint32_t signalOptions;
/* key to get the current synchronous signal */
static omrthread_tls_key_t tlsKeyCurrentSignal;
/* Calls to registerSignalHandlerWithOS are synchronized using registerHandlerMonitor */
static omrthread_monitor_t registerHandlerMonitor;
/* wakeUpASyncReporter semaphore coordinates between main async signal handler and
* async signal reporter thread.
*/
static j9sem_t wakeUpASyncReporter;
/* Used to synchronize shutdown of asynchSignalReporterThread. */
static omrthread_monitor_t asyncReporterShutdownMonitor;
/* Used to indicate start and end of asynchSignalReporterThread termination. */
static uint32_t shutDownASynchReporter;
static uint32_t mapWin32ExceptionToPortlibType(uint32_t exceptionCode);
static uint32_t infoForGPR(struct OMRPortLibrary *portLibrary, struct OMRWin32SignalInfo *info, int32_t index, const char **name, void **value);
static void removeAsyncHandlers(OMRPortLibrary *portLibrary);
static void fillInWin32SignalInfo(struct OMRPortLibrary *portLibrary, omrsig_handler_fn handler, EXCEPTION_POINTERS *exceptionInfo, struct OMRWin32SignalInfo *signalInfo);
static uint32_t infoForSignal(struct OMRPortLibrary *portLibrary, struct OMRWin32SignalInfo *info, int32_t index, const char **name, void **value);
static uint32_t infoForModule(struct OMRPortLibrary *portLibrary, struct OMRWin32SignalInfo *info, int32_t index, const char **name, void **value);
static uint32_t countInfoInCategory(struct OMRPortLibrary *portLibrary, void *info, uint32_t category);
static BOOL WINAPI consoleCtrlHandler(DWORD dwCtrlType);
int structuredExceptionHandler(struct OMRPortLibrary *portLibrary, omrsig_handler_fn handler, void *handler_arg, uint32_t flags, EXCEPTION_POINTERS *exceptionInfo);
static uint32_t infoForControl(struct OMRPortLibrary *portLibrary, struct OMRWin32SignalInfo *info, int32_t index, const char **name, void **value);
static intptr_t setCurrentSignal(struct OMRPortLibrary *portLibrary, intptr_t signal);
static uint32_t mapOSSignalToPortLib(uint32_t signalNo);
static int mapPortLibSignalToOSSignal(uint32_t portLibSignal);
static int32_t registerSignalHandlerWithOS(OMRPortLibrary *portLibrary, uint32_t portLibrarySignalNo, win_signal handler, void **oldOSHandler);
static int32_t initializeSignalTools(OMRPortLibrary *portLibrary);
static void destroySignalTools(OMRPortLibrary *portLibrary);
static void updateSignalCount(int osSignalNo);
static void mainASynchSignalHandler(int osSignalNo);
#if defined(OMR_PORT_ASYNC_HANDLER)
static int J9THREAD_PROC asynchSignalReporter(void *userData);
static void runHandlers(uint32_t asyncSignalFlag, int osSignal);
#endif /* defined(OMR_PORT_ASYNC_HANDLER) */
static int32_t registerMainHandlers(OMRPortLibrary *portLibrary, uint32_t flags, uint32_t allowedSubsetOfFlags, void **oldOSHandler);
static OMRWin32AsyncHandlerRecord *createAsyncHandlerRecord(struct OMRPortLibrary *portLibrary, omrsig_handler_fn handler, void *handler_arg, uint32_t flags);
static int32_t setReporterPriority(OMRPortLibrary *portLibrary, uintptr_t priority);
uint32_t
omrsig_info(struct OMRPortLibrary *portLibrary, void *info, uint32_t category, int32_t index, const char **name, void **value)
{
*name = "";
switch (category) {
case OMRPORT_SIG_SIGNAL:
return infoForSignal(portLibrary, info, index, name, value);
case OMRPORT_SIG_GPR:
return infoForGPR(portLibrary, info, index, name, value);
case OMRPORT_SIG_CONTROL:
return infoForControl(portLibrary, info, index, name, value);
case OMRPORT_SIG_MODULE:
return infoForModule(portLibrary, info, index, name, value);
case OMRPORT_SIG_FPR:
case OMRPORT_SIG_OTHER:
default:
return OMRPORT_SIG_VALUE_UNDEFINED;
}
}
uint32_t
omrsig_info_count(struct OMRPortLibrary *portLibrary, void *info, uint32_t category)
{
return countInfoInCategory(portLibrary, info, category);
}
int32_t
omrsig_protect(struct OMRPortLibrary *portLibrary, omrsig_protected_fn fn, void *fn_arg, omrsig_handler_fn handler, void *handler_arg, uint32_t flags, uintptr_t *result)
{
if (0 == (signalOptions & OMRPORT_SIG_OPTIONS_REDUCED_SIGNALS_SYNCHRONOUS)) {
__try {
*result = fn(portLibrary, fn_arg);
} __except (structuredExceptionHandler(portLibrary, handler, handler_arg, flags, GetExceptionInformation())) {
/* this code is only reachable if the handler returned OMRPORT_SIG_EXCEPTION_RETURN */
*result = 0;
return OMRPORT_SIG_EXCEPTION_OCCURRED;
}
} else {
/* reduced signals, no protection */
*result = fn(portLibrary, fn_arg);
}
return 0;
}
int32_t
omrsig_set_async_signal_handler(struct OMRPortLibrary *portLibrary, omrsig_handler_fn handler, void *handler_arg, uint32_t flags)
{
int32_t rc = 0;
OMRWin32AsyncHandlerRecord *cursor = NULL;
OMRWin32AsyncHandlerRecord **previousLink = NULL;
Trc_PRT_signal_omrsig_set_async_signal_handler_entered(handler, handler_arg, flags);
rc = registerMainHandlers(portLibrary, flags, OMRPORT_SIG_FLAG_SIGALLASYNC, NULL);
if (0 != rc) {
Trc_PRT_signal_omrsig_set_async_signal_handler_exiting_did_nothing_possible_error(handler, handler_arg, flags);
return rc;
}
omrthread_monitor_enter(asyncMonitor);
/* Wait until no signals are being reported. */
while (asyncThreadCount > 0) {
omrthread_monitor_wait(asyncMonitor);
}
/* Is this handler already registered? */
previousLink = &asyncHandlerList;
cursor = asyncHandlerList;
while (NULL != cursor) {
if ((cursor->portLib == portLibrary) && (cursor->handler == handler) && (cursor->handler_arg == handler_arg)) {
if (0 == flags) {
*previousLink = cursor->next;
portLibrary->mem_free_memory(portLibrary, cursor);
Trc_PRT_signal_omrsig_set_async_signal_handler_user_handler_removed(handler, handler_arg, flags);
/* If this is the last handler, unregister the handler function. */
if (NULL == asyncHandlerList) {
SetConsoleCtrlHandler(consoleCtrlHandler, FALSE);
}
} else {
/* Update the listener with the new flags. */
Trc_PRT_signal_omrsig_set_async_signal_handler_user_handler_added_1(handler, handler_arg, flags);
cursor->flags |= flags;
}
break;
}
previousLink = &cursor->next;
cursor = cursor->next;
}
/* Cursor will only be NULL if we failed to find it in the list. */
if ((NULL == cursor) && (0 != flags)) {
OMRWin32AsyncHandlerRecord *record = createAsyncHandlerRecord(portLibrary, handler, handler_arg, flags);
if (NULL != record) {
/* Add the new record to the end of the list. */
Trc_PRT_signal_omrsig_set_async_signal_handler_user_handler_added_2(handler, handler_arg, flags);
*previousLink = record;
} else {
rc = OMRPORT_SIG_ERROR;
}
}
omrthread_monitor_exit(asyncMonitor);
Trc_PRT_signal_omrsig_set_async_signal_handler_exiting(handler, handler_arg, flags);
return rc;
}
int32_t
omrsig_set_single_async_signal_handler(struct OMRPortLibrary *portLibrary, omrsig_handler_fn handler, void *handler_arg, uint32_t portlibSignalFlag, void **oldOSHandler)
{
int32_t rc = 0;
OMRWin32AsyncHandlerRecord *cursor = NULL;
OMRWin32AsyncHandlerRecord **previousLink = NULL;
BOOLEAN foundHandler = FALSE;
Trc_PRT_signal_omrsig_set_single_async_signal_handler_entered(handler, handler_arg, portlibSignalFlag);
if (0 != portlibSignalFlag) {
/* For non-zero portlibSignalFlag, check if only one signal bit is set. Otherwise, fail. */
if (!OMR_IS_ONLY_ONE_BIT_SET(portlibSignalFlag)) {
Trc_PRT_signal_omrsig_set_single_async_signal_handler_error_multiple_signal_flags_found(portlibSignalFlag);
return OMRPORT_SIG_ERROR;
}
}
rc = registerMainHandlers(portLibrary, portlibSignalFlag, OMRPORT_SIG_FLAG_SIGALLASYNC, oldOSHandler);
if (0 != rc) {
Trc_PRT_signal_omrsig_set_single_async_signal_handler_exiting_did_nothing_possible_error(rc, handler, handler_arg, portlibSignalFlag);
return rc;
}
omrthread_monitor_enter(asyncMonitor);
/* Wait until no signals are being reported. */
while (asyncThreadCount > 0) {
omrthread_monitor_wait(asyncMonitor);
}
/* Is this handler already registered? */
previousLink = &asyncHandlerList;
cursor = asyncHandlerList;
while (NULL != cursor) {
if (cursor->portLib == portLibrary) {
if ((cursor->handler == handler) && (cursor->handler_arg == handler_arg)) {
foundHandler = TRUE;
if (0 == portlibSignalFlag) {
/* Remove this handler record. */
*previousLink = cursor->next;
portLibrary->mem_free_memory(portLibrary, cursor);
Trc_PRT_signal_omrsig_set_single_async_signal_handler_user_handler_removed(handler, handler_arg, portlibSignalFlag);
/* If this is the last handler, then unregister the handler function. */
if (NULL == asyncHandlerList) {
SetConsoleCtrlHandler(consoleCtrlHandler, FALSE);
}
break;
} else {
/* Update the listener with the new portlibSignalFlag. */
Trc_PRT_signal_omrsig_set_single_async_signal_handler_user_handler_added_1(handler, handler_arg, portlibSignalFlag);
cursor->flags |= portlibSignalFlag;
}
} else {
/* Unset the portlibSignalFlag for other handlers. One signal must be associated to only one handler. */
cursor->flags &= ~portlibSignalFlag;
}
}
previousLink = &cursor->next;
cursor = cursor->next;
}
if (!foundHandler && (0 != portlibSignalFlag)) {
OMRWin32AsyncHandlerRecord *record = createAsyncHandlerRecord(portLibrary, handler, handler_arg, portlibSignalFlag);
if (NULL != record) {
/* Add the new record to the end of the list. */
Trc_PRT_signal_omrsig_set_single_async_signal_handler_user_handler_added_2(handler, handler_arg, portlibSignalFlag);
*previousLink = record;
} else {
rc = OMRPORT_SIG_ERROR;
}
}
omrthread_monitor_exit(asyncMonitor);
if (NULL != oldOSHandler) {
Trc_PRT_signal_omrsig_set_single_async_signal_handler_exiting(rc, handler, handler_arg, portlibSignalFlag, *oldOSHandler);
} else {
Trc_PRT_signal_omrsig_set_single_async_signal_handler_exiting(rc, handler, handler_arg, portlibSignalFlag, NULL);
}
return rc;
}
uint32_t
omrsig_map_os_signal_to_portlib_signal(struct OMRPortLibrary *portLibrary, uint32_t osSignalValue)
{
return mapOSSignalToPortLib(osSignalValue);
}
int32_t
omrsig_map_portlib_signal_to_os_signal(struct OMRPortLibrary *portLibrary, uint32_t portlibSignalFlag)
{
return (int32_t)mapPortLibSignalToOSSignal(portlibSignalFlag);
}
int32_t
omrsig_register_os_handler(struct OMRPortLibrary *portLibrary, uint32_t portlibSignalFlag, void *newOSHandler, void **oldOSHandler)
{
int32_t rc = 0;
Trc_PRT_signal_omrsig_register_os_handler_entered(portlibSignalFlag, newOSHandler);
if ((0 == portlibSignalFlag) || !OMR_IS_ONLY_ONE_BIT_SET(portlibSignalFlag)) {
/* If portlibSignalFlag is 0 or if portlibSignalFlag has multiple signal bits set, then fail. */
Trc_PRT_signal_omrsig_register_os_handler_invalid_portlibSignalFlag(portlibSignalFlag);
rc = OMRPORT_SIG_ERROR;
} else {
omrthread_monitor_enter(registerHandlerMonitor);
rc = registerSignalHandlerWithOS(portLibrary, portlibSignalFlag, (win_signal)newOSHandler, oldOSHandler);
omrthread_monitor_exit(registerHandlerMonitor);
}
if (NULL != oldOSHandler) {
Trc_PRT_signal_omrsig_register_os_handler_exiting(rc, portlibSignalFlag, newOSHandler, *oldOSHandler);
} else {
Trc_PRT_signal_omrsig_register_os_handler_exiting(rc, portlibSignalFlag, newOSHandler, NULL);
}
return rc;
}
BOOLEAN
omrsig_is_main_signal_handler(struct OMRPortLibrary *portLibrary, void *osHandler)
{
BOOLEAN rc = FALSE;
Trc_PRT_signal_omrsig_is_main_signal_handler_entered(osHandler);
if (osHandler == (void *)mainASynchSignalHandler) {
rc = TRUE;
}
Trc_PRT_signal_omrsig_is_main_signal_handler_exiting(rc);
return rc;
}
int32_t
omrsig_is_signal_ignored(struct OMRPortLibrary *portLibrary, uint32_t portlibSignalFlag, BOOLEAN *isSignalIgnored)
{
int32_t rc = 0;
Trc_PRT_signal_omrsig_is_signal_ignored_entered(portlibSignalFlag);
*isSignalIgnored = FALSE;
Trc_PRT_signal_omrsig_is_signal_ignored_exiting(rc, *isSignalIgnored);
return rc;
}
int32_t
omrsig_can_protect(struct OMRPortLibrary *portLibrary, uint32_t flags)
{
uint32_t supportedFlags = OMRPORT_SIG_FLAG_MAY_RETURN | OMRPORT_SIG_FLAG_MAY_CONTINUE_EXECUTION;
Trc_PRT_signal_omrsig_can_protect_entered(flags);
if (OMR_ARE_NO_BITS_SET(signalOptions, OMRPORT_SIG_OPTIONS_REDUCED_SIGNALS_SYNCHRONOUS)) {
supportedFlags |= OMRPORT_SIG_FLAG_SIGALLSYNC;
}
if (OMR_ARE_ALL_BITS_SET(supportedFlags, flags)) {
Trc_PRT_signal_omrsig_can_protect_exiting_is_able_to_protect(supportedFlags);
return 1;
}
Trc_PRT_signal_omrsig_can_protect_exiting_is_not_able_to_protect(supportedFlags);
return 0;
}
/**
* Shutdown the signal handling component of the port library
*/
void
omrsig_shutdown(struct OMRPortLibrary *portLibrary)
{
uint32_t index = 1;
omrthread_monitor_t globalMonitor = omrthread_global_monitor();
removeAsyncHandlers(portLibrary);
omrthread_monitor_enter(globalMonitor);
if (--attachedPortLibraries == 0) {
#if defined(OMR_PORT_ASYNC_HANDLER)
/* Terminate asynchSignalReporterThread. */
omrthread_monitor_enter(asyncReporterShutdownMonitor);
shutDownASynchReporter = 1;
j9sem_post(wakeUpASyncReporter);
while (0 != shutDownASynchReporter) {
omrthread_monitor_wait(asyncReporterShutdownMonitor);
}
omrthread_monitor_exit(asyncReporterShutdownMonitor);
#endif /* defined(OMR_PORT_ASYNC_HANDLER) */
/* Register the original signal handlers, which were overwritten. */
for (index = 1; index < ARRAY_SIZE_SIGNALS; index++) {
if (0 != handlerInfo[index].restore) {
OMRSIG_SIGNAL(index, handlerInfo[index].originalHandler);
/* record that we no longer have a handler installed with the OS for this signal */
Trc_PRT_signal_sig_full_shutdown_deregistered_handler_with_OS(portLibrary, index);
handlerInfo[index].restore = 0;
}
}
destroySignalTools(portLibrary);
}
omrthread_monitor_exit(globalMonitor);
}
/**
* Start up the signal handling component of the port library
*/
int32_t
omrsig_startup(struct OMRPortLibrary *portLibrary)
{
omrthread_monitor_t globalMonitor = omrthread_global_monitor();
int32_t result = 0;
uint32_t index = 1;
omrthread_monitor_enter(globalMonitor);
if (attachedPortLibraries++ == 0) {
/* initialize handlerInfo */
for (index = 1; index < ARRAY_SIZE_SIGNALS; index++) {
handlerInfo[index].restore = 0;
}
if (0 != initializeSignalTools(portLibrary)) {
result = OMRPORT_ERROR_STARTUP_SIGNAL_TOOLS;
}
}
omrthread_monitor_exit(globalMonitor);
return result;
}
int
structuredExceptionHandler(struct OMRPortLibrary *portLibrary, omrsig_handler_fn handler, void *handler_arg, uint32_t flags, EXCEPTION_POINTERS *exceptionInfo)
{
uint32_t result;
uint32_t type;
intptr_t prevSigType;
struct OMRWin32SignalInfo signalInfo;
if ((exceptionInfo->ExceptionRecord->ExceptionCode & (ERROR_SEVERITY_ERROR | APPLICATION_ERROR_MASK)) != ERROR_SEVERITY_ERROR) {
return EXCEPTION_CONTINUE_SEARCH;
}
type = mapWin32ExceptionToPortlibType(exceptionInfo->ExceptionRecord->ExceptionCode);
if (0 == (type & flags)) {
return EXCEPTION_CONTINUE_SEARCH;
}
fillInWin32SignalInfo(portLibrary, handler, exceptionInfo, &signalInfo);
prevSigType = portLibrary->sig_get_current_signal(portLibrary);
setCurrentSignal(portLibrary, type);
__try {
result = handler(portLibrary, signalInfo.type, &signalInfo, handler_arg);
} __except (EXCEPTION_EXECUTE_HANDLER) {
/* if a recursive exception occurs, ignore it and pass control to the next handler */
setCurrentSignal(portLibrary, prevSigType);
return EXCEPTION_CONTINUE_SEARCH;
}
setCurrentSignal(portLibrary, prevSigType);
if (result == OMRPORT_SIG_EXCEPTION_CONTINUE_SEARCH) {
return EXCEPTION_CONTINUE_SEARCH;
} else if (result == OMRPORT_SIG_EXCEPTION_CONTINUE_EXECUTION) {
return EXCEPTION_CONTINUE_EXECUTION;
} else /* if (result == OMRPORT_SIG_EXCEPTION_RETURN) */ {
return EXCEPTION_EXECUTE_HANDLER;
}
}
static uint32_t
mapWin32ExceptionToPortlibType(uint32_t exceptionCode)
{
switch (exceptionCode) {
case EXCEPTION_FLT_DIVIDE_BY_ZERO:
return OMRPORT_SIG_FLAG_SIGFPE_DIV_BY_ZERO;
case EXCEPTION_INT_DIVIDE_BY_ZERO:
return OMRPORT_SIG_FLAG_SIGFPE_INT_DIV_BY_ZERO;
case EXCEPTION_INT_OVERFLOW:
return OMRPORT_SIG_FLAG_SIGFPE_INT_OVERFLOW;
case EXCEPTION_FLT_OVERFLOW:
case EXCEPTION_FLT_UNDERFLOW:
case EXCEPTION_FLT_INVALID_OPERATION:
case EXCEPTION_FLT_INEXACT_RESULT:
case EXCEPTION_FLT_DENORMAL_OPERAND:
case EXCEPTION_FLT_STACK_CHECK:
return OMRPORT_SIG_FLAG_SIGFPE;
case EXCEPTION_PRIV_INSTRUCTION:
case EXCEPTION_ILLEGAL_INSTRUCTION:
return OMRPORT_SIG_FLAG_SIGILL;
case EXCEPTION_ACCESS_VIOLATION:
return OMRPORT_SIG_FLAG_SIGSEGV;
case EXCEPTION_IN_PAGE_ERROR:
case EXCEPTION_DATATYPE_MISALIGNMENT:
return OMRPORT_SIG_FLAG_SIGBUS;
default:
return OMRPORT_SIG_FLAG_SIGTRAP;
}
}
static void
fillInWin32SignalInfo(struct OMRPortLibrary *portLibrary, omrsig_handler_fn handler, EXCEPTION_POINTERS *exceptionInfo, struct OMRWin32SignalInfo *signalInfo)
{
memset(signalInfo, 0, sizeof(*signalInfo));
signalInfo->type = mapWin32ExceptionToPortlibType(exceptionInfo->ExceptionRecord->ExceptionCode);
signalInfo->handlerAddress = (void *)handler;
signalInfo->handlerAddress2 = (void *)structuredExceptionHandler;
signalInfo->ExceptionRecord = exceptionInfo->ExceptionRecord;
signalInfo->ContextRecord = exceptionInfo->ContextRecord;
/* module info is filled on demand */
}
static uint32_t
infoForSignal(struct OMRPortLibrary *portLibrary, struct OMRWin32SignalInfo *info, int32_t index, const char **name, void **value)
{
*name = "";
switch (index) {
case OMRPORT_SIG_SIGNAL_TYPE:
case 0:
*name = "J9Generic_Signal_Number";
*value = &info->type;
return OMRPORT_SIG_VALUE_32;
case OMRPORT_SIG_SIGNAL_PLATFORM_SIGNAL_TYPE:
case 1:
*name = "ExceptionCode";
*value = &info->ExceptionRecord->ExceptionCode;
return OMRPORT_SIG_VALUE_32;
case OMRPORT_SIG_SIGNAL_ADDRESS:
case 2:
*name = "ExceptionAddress";
*value = &info->ExceptionRecord->ExceptionAddress;
return OMRPORT_SIG_VALUE_ADDRESS;
case 3:
*name = "ContextFlags";
*value = &info->ContextRecord->ContextFlags;
return OMRPORT_SIG_VALUE_32;
case OMRPORT_SIG_SIGNAL_HANDLER:
case 4:
*name = "Handler1";
*value = &info->handlerAddress;
return OMRPORT_SIG_VALUE_ADDRESS;
case 5:
*name = "Handler2";
*value = &info->handlerAddress2;
return OMRPORT_SIG_VALUE_ADDRESS;
case OMRPORT_SIG_SIGNAL_INACCESSIBLE_ADDRESS:
case 6:
/* For EXCEPTION_ACCESS_VIOLATION (very common) we can extract the address
* that was being read or written to and whether it was an attempt to read, write
* or execute the data at that address.
* http://msdn.microsoft.com/en-us/library/windows/desktop/aa363082%28v=vs.85%29.aspx */
if (EXCEPTION_ACCESS_VIOLATION == info->ExceptionRecord->ExceptionCode) {
if (EXCEPTION_READ_FAULT == info->ExceptionRecord->ExceptionInformation[0]) {
*name = "InaccessibleReadAddress";
} else if (EXCEPTION_WRITE_FAULT == info->ExceptionRecord->ExceptionInformation[0]) {
*name = "InaccessibleWriteAddress";
} else if (EXCEPTION_EXECUTE_FAULT == info->ExceptionRecord->ExceptionInformation[0]) {
*name = "DEPAddress";
}
*value = &info->ExceptionRecord->ExceptionInformation[1];
return OMRPORT_SIG_VALUE_ADDRESS;
} else {
return OMRPORT_SIG_VALUE_UNDEFINED;
}
default:
return OMRPORT_SIG_VALUE_UNDEFINED;
}
}
static uint32_t
infoForGPR(struct OMRPortLibrary *portLibrary, struct OMRWin32SignalInfo *info, int32_t index, const char **name, void **value)
{
*name = "";
if (info->ContextRecord->ContextFlags & CONTEXT_INTEGER) {
switch (index) {
case OMRPORT_SIG_GPR_X86_EDI:
case 0:
*name = "EDI";
*value = &info->ContextRecord->Edi;
return OMRPORT_SIG_VALUE_ADDRESS;
case OMRPORT_SIG_GPR_X86_ESI:
case 1:
*name = "ESI";
*value = &info->ContextRecord->Esi;
return OMRPORT_SIG_VALUE_ADDRESS;
case OMRPORT_SIG_GPR_X86_EAX:
case 2:
*name = "EAX";
*value = &info->ContextRecord->Eax;
return OMRPORT_SIG_VALUE_ADDRESS;
case OMRPORT_SIG_GPR_X86_EBX:
case 3:
*name = "EBX";
*value = &info->ContextRecord->Ebx;
return OMRPORT_SIG_VALUE_ADDRESS;
case OMRPORT_SIG_GPR_X86_ECX:
case 4:
*name = "ECX";
*value = &info->ContextRecord->Ecx;
return OMRPORT_SIG_VALUE_ADDRESS;
case OMRPORT_SIG_GPR_X86_EDX:
case 5:
*name = "EDX";
*value = &info->ContextRecord->Edx;
return OMRPORT_SIG_VALUE_ADDRESS;
default:
return OMRPORT_SIG_VALUE_UNDEFINED;
}
}
return OMRPORT_SIG_VALUE_UNDEFINED;
}
static uint32_t
infoForControl(struct OMRPortLibrary *portLibrary, struct OMRWin32SignalInfo *info, int32_t index, const char **name, void **value)
{
*name = "";
if (info->ContextRecord->ContextFlags & CONTEXT_CONTROL) {
switch (index) {
case OMRPORT_SIG_CONTROL_PC:
case 0:
*name = "EIP";
*value = &info->ContextRecord->Eip;
return OMRPORT_SIG_VALUE_ADDRESS;
case OMRPORT_SIG_CONTROL_SP:
case 1:
*name = "ESP";
*value = &info->ContextRecord->Esp;
return OMRPORT_SIG_VALUE_ADDRESS;
case OMRPORT_SIG_CONTROL_BP:
case 2:
*name = "EBP";
*value = &info->ContextRecord->Ebp;
return OMRPORT_SIG_VALUE_ADDRESS;
case OMRPORT_SIG_CONTROL_X86_EFLAGS:
case 3:
*name = "EFLAGS";
*value = &info->ContextRecord->EFlags;
return OMRPORT_SIG_VALUE_ADDRESS;
}
}
if (info->ContextRecord->ContextFlags & CONTEXT_SEGMENTS) {
switch (index) {
case 4:
*name = "GS";
*value = &info->ContextRecord->SegGs;
return OMRPORT_SIG_VALUE_16;
case 5:
*name = "FS";
*value = &info->ContextRecord->SegFs;
return OMRPORT_SIG_VALUE_16;
case 6:
*name = "ES";
*value = &info->ContextRecord->SegEs;
return OMRPORT_SIG_VALUE_16;
case 7:
*name = "DS";
*value = &info->ContextRecord->SegDs;
return OMRPORT_SIG_VALUE_16;
}
}
return OMRPORT_SIG_VALUE_UNDEFINED;
}
static uint32_t
infoForModule(struct OMRPortLibrary *portLibrary, struct OMRWin32SignalInfo *info, int32_t index, const char **name, void **value)
{
if (info->moduleBaseAddress == NULL) {
MEMORY_BASIC_INFORMATION mbi;
if (VirtualQuery((LPBYTE) info->ExceptionRecord->ExceptionAddress, &mbi, sizeof(mbi)) == sizeof(mbi)) {
if (MEM_FREE == mbi.State) {
/* misc hack from Advanced Windows (Richter) */
mbi.AllocationBase = mbi.BaseAddress;
}
GetModuleFileName((HINSTANCE) mbi.AllocationBase, info->moduleName, sizeof(info->moduleName));
info->moduleBaseAddress = mbi.AllocationBase;
info->offsetInDLL = (uintptr_t) info->ExceptionRecord->ExceptionAddress - (uintptr_t) mbi.AllocationBase;
}
}
*name = "";
switch (index) {
case OMRPORT_SIG_MODULE_NAME:
case 0:
*name = "Module";
*value = &info->moduleName;
return OMRPORT_SIG_VALUE_STRING;
case 1:
*name = "Module_base_address";
*value = &info->moduleBaseAddress;
return OMRPORT_SIG_VALUE_ADDRESS;
case 2:
*name = "Offset_in_DLL";
*value = &info->offsetInDLL;
return OMRPORT_SIG_VALUE_32;
default:
return OMRPORT_SIG_VALUE_UNDEFINED;
}
}
static uint32_t
countInfoInCategory(struct OMRPortLibrary *portLibrary, void *info, uint32_t category)
{
void *value;
const char *name;
uint32_t count = 0;
while (portLibrary->sig_info(portLibrary, info, category, count, &name, &value) != OMRPORT_SIG_VALUE_UNDEFINED) {
count++;
}
return count;
}
/**
* Translate the control signal into an OS signal, update signalCounts
* and notify asynchSignalReporterThread to execute the associated handlers.
*
* @param[in] dwCtrlType the type of control signal received
*
* @return TRUE if the control signal is handled. Otherwise, return FALSE.
*/
static BOOL WINAPI
consoleCtrlHandler(DWORD dwCtrlType)
{
BOOL result = FALSE;
int osSignalNo = OMRPORT_SIG_ERROR;
switch (dwCtrlType) {
case CTRL_BREAK_EVENT:
osSignalNo = SIGBREAK;
break;
case CTRL_C_EVENT:
osSignalNo = SIGINT;
break;
case CTRL_CLOSE_EVENT:
case CTRL_LOGOFF_EVENT:
case CTRL_SHUTDOWN_EVENT:
osSignalNo = SIGTERM;
break;
default:
break;
}
if (OMRPORT_SIG_ERROR != osSignalNo) {
updateSignalCount(osSignalNo);
result = TRUE;
}
return result;
}
static void
removeAsyncHandlers(OMRPortLibrary *portLibrary)
{
/* clean up the list of async handlers */
OMRWin32AsyncHandlerRecord *cursor;
OMRWin32AsyncHandlerRecord **previousLink;
omrthread_monitor_enter(asyncMonitor);
/* wait until no signals are being reported */
while (asyncThreadCount > 0) {
omrthread_monitor_wait(asyncMonitor);
}
previousLink = &asyncHandlerList;
cursor = asyncHandlerList;
while (cursor) {
if (cursor->portLib == portLibrary) {
*previousLink = cursor->next;
portLibrary->mem_free_memory(portLibrary, cursor);
cursor = *previousLink;
} else {
previousLink = &cursor->next;
cursor = cursor->next;
}
}
if (asyncHandlerList == NULL) {
SetConsoleCtrlHandler(consoleCtrlHandler, FALSE);
}
omrthread_monitor_exit(asyncMonitor);
}
/**
* none of the current options are supported by windows IA32
*/
int32_t
omrsig_set_options(struct OMRPortLibrary *portLibrary, uint32_t options)
{
uint32_t supportedFlags = OMRPORT_SIG_OPTIONS_REDUCED_SIGNALS_SYNCHRONOUS | OMRPORT_SIG_OPTIONS_REDUCED_SIGNALS_ASYNCHRONOUS;
if (options & ~supportedFlags) {
return -1;
}
signalOptions = options;
return 0;
}
/* these options should always be 0 */
uint32_t
omrsig_get_options(struct OMRPortLibrary *portLibrary)
{
return signalOptions;
}
/**
* Set the priority of the asynchronous signal reporting thread (asynchSignalReporterThread).
*
* @param[in] portLibrary the OMR port library
* @param[in] priority the thread priority
*
* @return 0 upon success and non-zero upon failure.
*/
int32_t
omrsig_set_reporter_priority(struct OMRPortLibrary *portLibrary, uintptr_t priority)
{
int32_t result = 0;
omrthread_monitor_t globalMonitor = omrthread_global_monitor();
omrthread_monitor_enter(globalMonitor);
if (attachedPortLibraries > 0) {
result = setReporterPriority(portLibrary, priority);
}
omrthread_monitor_exit(globalMonitor);
return result;
}
static intptr_t
setCurrentSignal(struct OMRPortLibrary *portLibrary, intptr_t signal)
{
omrthread_t thisThread = omrthread_self();
omrthread_tls_set(thisThread, tlsKeyCurrentSignal, (intptr_t *) signal);
return 1;
}
intptr_t
omrsig_get_current_signal(struct OMRPortLibrary *portLibrary)
{
omrthread_t thisThread = omrthread_self();
return (intptr_t) omrthread_tls_get(thisThread, tlsKeyCurrentSignal);
}
/**
* The OS signal number is converted to the corresponding port library
* signal flag.
*
* @param[in] signalNo OS signal number
*
* @return The corresponding port library signal flag on success.
* Otherwise, return 0 in case of error.
*/
static uint32_t
mapOSSignalToPortLib(uint32_t signalNo)
{
uint32_t index = 0;
for (index = 0; index < sizeof(signalMap) / sizeof(signalMap[0]); index++) {
if (signalMap[index].osSignalNo == signalNo) {
return signalMap[index].portLibSignalNo;
}
}
Trc_PRT_signal_mapOSSignalToPortLib_ERROR_unknown_signal(signalNo);
return 0;
}
/**
* The port library signal flag is converted to the corresponding OS signal number.
*
* @param portLibSignal the port library signal flag
*
* @return The corresponding OS signal number or OMRPORT_SIG_ERROR (-1) if the portLibSignal
* can't be mapped.
*/
static int
mapPortLibSignalToOSSignal(uint32_t portLibSignal)
{
uint32_t index = 0;
for (index = 0; index < sizeof(signalMap) / sizeof(signalMap[0]); index++) {
if (signalMap[index].portLibSignalNo == portLibSignal) {
return signalMap[index].osSignalNo;
}
}
Trc_PRT_signal_mapPortLibSignalToOSSignal_ERROR_unknown_signal(portLibSignal);
return OMRPORT_SIG_ERROR;
}
/**
* Register the signal handler with the OS. Calls to this function must be synchronized using
* "registerHandlerMonitor". *oldOSHandler points to the old signal handler function. It is only
* set if oldOSHandler is non-null. During the first registration, the old signal handler is
* stored in handlerInfo[osSignalNo].originalHandler. The original OS handler must be restored
* during port library shut down.
*
* @param[in] portLibrary the OMR port library
* @param[in] portLibrarySignalNo the port library signal flag
* @param[in] handler the OS handler to register
* @param[out] oldOSHandler points to the old OS handler, if oldOSHandler is non-null
*
* @return 0 upon success, non-zero otherwise.