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/**
* Copyright (C) ARM Limited 2014-2016. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include "TtraceDriver.h"
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "Logging.h"
#include "OlyUtility.h"
#include "SessionData.h"
class TtraceCounter : public DriverCounter {
public:
TtraceCounter(DriverCounter *next, char *name, int flag);
~TtraceCounter();
int getFlag() const { return mFlag; }
private:
const int mFlag;
// Intentionally unimplemented
TtraceCounter(const TtraceCounter &);
TtraceCounter &operator=(const TtraceCounter &);
};
TtraceCounter::TtraceCounter(DriverCounter *next, char *name, int flag) : DriverCounter(next, name), mFlag(flag) {
}
TtraceCounter::~TtraceCounter() {
}
TtraceDriver::TtraceDriver() : mSupported(false) {
}
TtraceDriver::~TtraceDriver() {
}
void TtraceDriver::readEvents(mxml_node_t *const xml) {
if (access("/etc/tizen-release", R_OK) != 0) {
// Reduce warning noise
//logg.logSetup("Ttrace is disabled\n/etc/tizen-release is not found, this is not a Tizen target");
return;
}
if (!gSessionData.mFtraceDriver.isSupported()) {
logg.logSetup("Ttrace is disabled\nSupport for ftrace required");
return;
}
mSupported = true;
mxml_node_t *node = xml;
while (true) {
node = mxmlFindElement(node, xml, "event", NULL, NULL, MXML_DESCEND);
if (node == NULL) {
break;
}
const char *counter = mxmlElementGetAttr(node, "counter");
if (counter == NULL) {
continue;
}
if (strncmp(counter, "ttrace_", 7) != 0) {
continue;
}
const char *flagStr = mxmlElementGetAttr(node, "flag");
if (flagStr == NULL) {
logg.logError("The ttrace counter %s is missing the required flag attribute", counter);
handleException();
}
int flag;
if (!stringToInt(&flag, flagStr, 16)) {
logg.logError("The flag attribute of the ttrace counter %s is not a hex integer", counter);
handleException();
}
setCounters(new TtraceCounter(getCounters(), strdup(counter), flag));
}
}
void TtraceDriver::setTtrace(const int flags) {
logg.logMessage("Setting ttrace flags to %i", flags);
const int fd = open("/tmp/ttrace_tag", O_CREAT | O_RDWR | O_CLOEXEC, 0666);
if (fd < 0) {
logg.logError("Unable to open /tmp/ttrace_tag");
handleException();
}
if (ftruncate(fd, sizeof(uint64_t)) != 0) {
logg.logError("ftruncate failed");
handleException();
}
uint64_t *const buf = (uint64_t *)mmap(NULL, sizeof(uint64_t), PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (buf == MAP_FAILED) {
logg.logError("mmap failed");
handleException();
}
close(fd);
*buf = flags;
munmap(buf, sizeof(uint64_t));
}
void TtraceDriver::start() {
if (!mSupported) {
return;
}
int flags = 0;
for (TtraceCounter *counter = static_cast<TtraceCounter *>(getCounters()); counter != NULL; counter = static_cast<TtraceCounter *>(counter->getNext())) {
if (!counter->isEnabled()) {
continue;
}
flags |= counter->getFlag();
}
setTtrace(flags);
}
void TtraceDriver::stop() {
if (!mSupported) {
return;
}
setTtrace(0);
}
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