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Bugfix in BufferCache, added some security checks, plus minor stuff in doc/howtobuild.txt

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git-svn-id: https://www4.informatik.uni-erlangen.de/i4svn/danceos/trunk/devel/fail@1323 8c4709b5-6ec9-48aa-a5cd-a96041d1645a
This commit is contained in:
unzner
2012-06-09 17:31:32 +00:00
parent 2575604b41
commit 13cd951a87
7 changed files with 127 additions and 73 deletions
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8
doc/howto-build.txt
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@ -97,7 +97,7 @@ Build Bochs
===========
For the first time
------------------
cd ../bochs
cd ../simulators/bochs
> Sufficient:
./configure --prefix=$(echo ~/localroot/usr) --enable-{cpu-level=6,ne2000,trace-cache,gdb-stub} --disable-docbook
> More optimised:
@ -136,17 +136,17 @@ Debug build
-----------
> Configure Bochs to use debugging-related compiler flags:
cd ../bochs
CXXFLAGS="-g -O0" ./configure --prefix=... ... (see above)
CFLAGS="-g -O0" CXXFLAGS="-g -O0" ./configure --prefix=... ... (see above)
Profiling-based optimization build
----------------------------------
> FIXME: ag++ needs to be run with --keep_woven
> Configure Bochs to use compiler flags to enable profiling:
cd ../bochs
CXXFLAGS="-fprofile-generate" LDFLAGS="-fprofile-generate" ./configure --prefix=... ... (see above)
CFLAGS="-fprofile-generate" CXXFLAGS="-fprofile-generate" LDFLAGS="-fprofile-generate" ./configure --prefix=... ... (see above)
> Build Bochs normally, and run it.
> Configure Bochs to use compiler flags to enable optimizations based on profiling results:
CXXFLAGS="-fprofile-use -Wcoverage-mismatch" LDFLAGS="-fprofile-use" ./configure --prefix=... ... (see above)
CFLAGS="-fprofile-use -Wcoverage-mismatch" CXXFLAGS="-fprofile-use -Wcoverage-mismatch" LDFLAGS="-fprofile-use" ./configure --prefix=... ... (see above)
Benchmarking
------------

59
src/core/sal/BufferCache.cc
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@ -1,27 +1,28 @@
#include <algorithm>
#include <vector>
#include "BufferCache.hpp"
#include "Event.hpp"
#include "EventList.hpp"
namespace fail {
template<class T>
int BufferCache<T>::add(T val)
void BufferCache<T>::add(T val)
{
size_t new_size = getCount() + 1;
size_t new_last_index = getCount();
int new_size = getCount() + 1;
int new_last_index = getCount();
int res = reallocate_buffer(new_size);
if (res == 0) {
set(new_last_index, val);
}
assert (res == 0 && "FATAL ERROR: Could not add event to cache");
return res;
set(new_last_index, val);
}
template<class T>
int BufferCache<T>::remove(T val)
void BufferCache<T>::remove(T val)
{
bool do_remove = false;
for (size_t i = 0; i < getCount(); i++) {
for (int i = 0; i < getCount(); i++) {
if (get(i) == val) {
do_remove = true;
}
@ -32,13 +33,11 @@ int BufferCache<T>::remove(T val)
}
}
int res = 0;
if (do_remove) {
size_t new_size = getCount() - 1;
res = reallocate_buffer(new_size);
int new_size = getCount() - 1;
int res = reallocate_buffer(new_size);
assert (res == 0 && "FATAL ERROR: Could not remove event from cache");
}
return res;
}
template<class T>
@ -52,19 +51,25 @@ void BufferCache<T>::clear()
template<class T>
int BufferCache<T>::erase(int idx)
{
for (size_t i = idx; i < getCount() - 1; i++) {
if(idx < 0 || idx >= getCount())
return -2;
for (int i = idx; i < getCount() - 1; i++) {
set(i, get(i + 1));
}
size_t new_size = getCount() - 1;
int new_size = getCount() - 1;
if (reallocate_buffer(new_size) != 0)
return -1;
return idx;
}
template<class T>
int BufferCache<T>::reallocate_buffer(size_t new_size)
int BufferCache<T>::reallocate_buffer(int new_size)
{
if (new_size < 0)
return 20;
if (new_size == 0) {
clear();
return 0;
@ -77,6 +82,26 @@ int BufferCache<T>::reallocate_buffer(size_t new_size)
return 0;
}
template<class T>
int BufferCache<T>::makeActive(EventList &ev_list, int idx)
{
assert(idx < getCount() &&
"FATAL ERROR: Index larger than cache!");
T ev = get(idx);
assert(ev && "FATAL ERROR: Object pointer cannot be NULL!");
ev->decreaseCounter();
if (ev->getCounter() > 0) {
return ++idx;
}
ev->resetCounter();
// Note: This is the one and only situation in which remove() should NOT
// store the removed item in the delete-list.
EventList::iterator it = std::find(ev_list.begin(), ev_list.end(), static_cast<BaseEvent*>(ev));
ev_list.m_remove(it, true); // remove event from buffer-list
ev_list.m_FireList.push_back(ev);
return erase(idx);
}
// Declare whatever instances of the template you are going to use here:
template class BufferCache<BPEvent*>;

47
src/core/sal/BufferCache.hpp
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@ -3,11 +3,10 @@
#include <stdlib.h>
// FIXME: (Maybe) This should be located in utils, because
// it's "Fail*-independend"...?
namespace fail {
class EventList;
/**
* \class BufferCache
*
@ -15,11 +14,8 @@ namespace fail {
*
* This class is intended to serve as a kind of cache for the entirely STL-based,
* untyped and therefore quite slow event handling mechanism of Fail*.
* To keep the code easily readable, the buffer management methods
* are less performant than the could be (remove() and erase() have linear complexity).
*
* FIXME: This desription sounds like a contradiction...
* (-> "quite slow event handling" vs. "are less performant than the could be")
* To keep the code easily readable, some buffer management methods
* perform suboptimally (remove() and erase() have linear complexity).
*
* FIXME: Why not using std::vector? ("A simple dynamic array")
*/
@ -28,21 +24,21 @@ class BufferCache {
private:
// TODO: comments ("//!<") needed!
T *m_Buffer;
size_t m_BufferCount;
protected:
int m_BufferCount;
/**
* Changes the current length of the array. Should be inlined.
* Changes m_BufferCount. Should be inlined.
* @param new_count the new array length
*/
inline void setCount(size_t new_count) { m_BufferCount = new_count; }
inline void setCount(int new_count) { if(new_count >= 0) m_BufferCount = new_count; }
protected:
/**
* Reallocates the buffer. This implementation is extremely primitive,
* but since the amount of entries is small,
* this will not be significant, hopefully. Should be inlined.
* @param new_size the new number of elements in the array
* @return 0 if successful, an error code otherwise (ATM only 10 if malloc() fails)
* @return 0 if successful, an error code otherwise (10 if realloc() fails, 20 for an invalid new size)
*/
inline int reallocate_buffer(size_t new_size);
inline int reallocate_buffer(int new_size);
public:
BufferCache()
: m_Buffer(NULL), m_BufferCount(0) {}
@ -50,19 +46,17 @@ public:
/**
* Add an element to the array. The object pointed to remains untouched.
* @param val the element to add
* @return 0 if successful, an error code otherwise (ATM only 10 if malloc() fails)
*/
int add(T val);
void add(T val);
/**
* Remove an element from the array. The object pointed to remains untouched.
* @param val the element to remove
* @return 0 if successful, an error code otherwise (ATM only 10 if malloc() fails)
*/
int remove(T val);
void remove(T val);
/**
* Remove an element at a specific position. The object pointed to remains untouched.
* @param val the element to remove
* @return a pointer to the given element's successor if successful, -1 otherwise
* @return a pointer to the given element's successor if successful, a negative value otherwise
*/
int erase(int i);
/**
@ -74,18 +68,27 @@ public:
* @param idx the position to retrieve the element from
* @return the element at the given position
*/
inline T get(size_t idx) { return m_Buffer[idx]; }
inline T get(int idx) { return (idx >= 0 && idx < getCount() ? m_Buffer[idx] : NULL); }
/**
* Set an element at a given position. Should be inlined.
* @param idx the position to change an element at
* @param val the new value of the given element
*/
inline void set(size_t idx, T val) { m_Buffer[idx] = val; }
inline void set(int idx, T val) { if(idx >= 0 && idx < getCount()) m_Buffer[idx] = val; }
/**
* Retrieves the current length of the array. Should be inlined.
* @return the array length
*/
inline size_t getCount() { return m_BufferCount; }
inline int getCount() { return m_BufferCount; }
/**
* Acts as a replacement for EventList::makeActive, manipulating
* the buffer cache exclusively. EventList::fireActiveEvents needs
* to be called to fire the active events (see there).
* This method is declared as a friend method in EventList.
* @param idx the index of the event to trigger
* @returns an updated index which can be used to update a loop counter
*/
int makeActive(EventList &ev_list, int idx);
};
} // end-of-namespace: fail

15
src/core/sal/EventList.cc
View File

@ -63,16 +63,23 @@ EventList::iterator EventList::m_remove(iterator it, bool skip_deletelist)
if (!skip_deletelist) {
// If skip_deletelist = true, m_remove was called from makeActive. Accordingly, we
// are not going to delete an event, instead we are "moving" an event object (= *it)
// from the buffer list to the fire-list. Therefor we only need to call the simulator's
// from the buffer list to the fire-list. Therefore we only need to call the simulator's
// event handler (m_onEventDeletion), if m_remove is called with the primary intention
// to *delete* (not "move") an event.
simulator.onEventDeletion(*it);
m_DeleteList.push_back(*it);
// Cached events have their own BufferCache<T>::makeActive() implementation, which
// calls this method and afterwards erase() in the cache class. This is why, when
// called from any kind of makeActive() method, it is unnecessary to call
// BufferCache<T>::remove() from m_remove().
// NOTE: in case the semantics of skip_deletelist change, please adapt the following lines
BPEvent *bp_ev;
if((bp_ev = dynamic_cast<BPEvent*>(*it)) != NULL)
m_Bp_cache.remove(bp_ev);
}
BPEvent *bp_ev;
if((bp_ev = dynamic_cast<BPEvent*>(*it)) != NULL)
m_Bp_cache.remove(bp_ev);
return (m_BufferList.erase(it));
}

1
src/core/sal/EventList.hpp
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@ -54,6 +54,7 @@ class EventList
deletelist_t m_DeleteList; //!< the deleted events (used temporarily)
BaseEvent* m_pFired; //!< the recently fired Event-object
BufferCache<BPEvent*> m_Bp_cache;
friend int BufferCache<BPEvent*>::makeActive(EventList &ev_list, int idx);
public:
/**
* The iterator of this class used to loop through the list of

17
src/core/sal/bochs/BochsController.cc
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@ -119,24 +119,17 @@ void BochsController::onInstrPtrChanged(address_t instrPtr, address_t address_sp
#endif
//this code is highly optimised for the average case, so it me appear a bit ugly
bool do_fire = false;
unsigned i = 0;
int i = 0;
BufferCache<BPEvent*> *buffer_cache = m_EvList.getBPBuffer();
while(i < buffer_cache->getCount()) {
BPEvent *pEvBreakpt = buffer_cache->get(i);
if(pEvBreakpt->isMatching(instrPtr, address_space)) {
pEvBreakpt->setTriggerInstructionPointer(instrPtr);
//transition to STL: find the element we are working on in the Event List
EventList::iterator it = std::find(m_EvList.begin(), m_EvList.end(), pEvBreakpt);
it = m_EvList.makeActive(it);
//find out how much elements need to be skipped to get in sync again
//(should be one or none, the loop is just to make sure)
for(unsigned j = i; j < buffer_cache->getCount(); j++) {
if(buffer_cache->get(j) == (*it)) {
i = j;
break;
}
}
i = buffer_cache->makeActive(m_EvList, i);
assert(i >= 0 &&
"FATAL ERROR: Could not erase BPEvent from cache");
// we now know we need to fire the active events - usually we do not have to
do_fire = true;
// "i" has already been set to the next element (by calling

53
src/experiments/l4-sys/experiment.cc
View File

@ -32,12 +32,29 @@ using namespace fail;
save, and restore. Enable these in the configuration.
#endif
typedef struct __trace_instr_type {
address_t trigger_addr;
unsigned bp_counter;
} trace_instr;
ostream& operator<<(ostream& out, const trace_instr &val) {
out << val.trigger_addr << "," << val.bp_counter;
return out;
}
istream& operator>>(istream& in, trace_instr &val) {
in >> val.trigger_addr;
//skip the comma
in.ignore(1);
in >> val.bp_counter;
return in;
}
char const * const state_folder = "l4sys.state";
char const * const instr_list_fn = "ip.list";
char const * const golden_run_fn = "golden.out";
address_t const aspace = 0x01e00000;
string output;
vector<address_t> instr_list;
vector<trace_instr> instr_list;
string golden_run;
//the program needs to run 5 times without a fault
const unsigned times_run = 5;
@ -85,8 +102,6 @@ bool L4SysExperiment::run()
log << "startup" << endl;
#ifdef PREPARE_EXPERIMENT
struct stat teststruct;
// STEP 1: run until interesting function starts, and save state
if (stat(state_folder, &teststruct) == -1) {
@ -115,14 +130,25 @@ bool L4SysExperiment::run()
ofstream instr_list_file(instr_list_fn);
instr_list_file << hex;
bp.setWatchInstructionPointer(ANY_ADDR);
map<address_t, unsigned> times_called_map;
while (bp.getTriggerInstructionPointer() != L4SYS_FUNC_EXIT) {
simulator.addEventAndWait(&bp);
//short sanity check
address_t curr_instr = bp.getTriggerInstructionPointer();
address_t curr_addr = bp.getTriggerInstructionPointer();
assert(
curr_instr == simulator.getRegisterManager().getInstructionPointer());
instr_list.push_back(curr_instr);
instr_list_file << curr_instr << endl;
curr_addr == simulator.getRegisterManager().getInstructionPointer());
unsigned times_called = times_called_map[curr_addr];
times_called++;
times_called_map[curr_addr] = times_called;
trace_instr new_instr;
new_instr.trigger_addr = curr_addr;
new_instr.bp_counter = times_called;
instr_list.push_back(new_instr);
instr_list_file << new_instr << endl;
}
log << "saving instructions triggered during normal execution" << endl;
instr_list_file.close();
@ -130,7 +156,7 @@ bool L4SysExperiment::run()
ifstream instr_list_file(instr_list_fn);
instr_list_file >> hex;
while (!instr_list_file.eof()) {
address_t curr_instr;
trace_instr curr_instr;
instr_list_file >> curr_instr;
instr_list.push_back(curr_instr);
}
@ -186,10 +212,8 @@ bool L4SysExperiment::run()
output.reserve(flen);
}
#endif
// STEP 4: The actual experiment.
for (int i = 0; i < 1/*L4SYS_NUMINSTR*/; i++) {
for (int i = 0; i < L4SYS_NUMINSTR; i++) {
log << "restoring state" << endl;
simulator.restore(state_folder);
@ -206,7 +230,8 @@ bool L4SysExperiment::run()
log << "job " << id << " instr " << instr_offset << " bit "
<< bit_offset << endl;
bp.setWatchInstructionPointer(instr_list[instr_offset]);
bp.setWatchInstructionPointer(instr_list[instr_offset].trigger_addr);
bp.setCounter(instr_list[instr_offset].bp_counter);
simulator.addEvent(&bp);
//and log the output
waitIOOrOther(true);
@ -227,10 +252,10 @@ bool L4SysExperiment::run()
<< endl;
// sanity check (only works if we're working with an instruction trace)
if (injection_ip != instr_list[instr_offset]) {
if (injection_ip != instr_list[instr_offset].trigger_addr) {
stringstream ss;
ss << "SANITY CHECK FAILED: " << injection_ip << " != "
<< instr_list[instr_offset] << endl;
<< instr_list[instr_offset].trigger_addr << endl;
log << ss.str();
param.msg.set_resulttype(param.msg.UNKNOWN);
param.msg.set_resultdata(injection_ip);