diff --git a/rpcs3/Emu/CPU/CPUThread.cpp b/rpcs3/Emu/CPU/CPUThread.cpp
index f948836ef5..4267e56f91 100644
--- a/rpcs3/Emu/CPU/CPUThread.cpp
+++ b/rpcs3/Emu/CPU/CPUThread.cpp
@@ -28,6 +28,7 @@ CPUThread::CPUThread(CPUThreadType type)
 	, m_is_step(false)
 	, m_is_branch(false)
 	, m_status(Stopped)
+	, m_last_syscall(0)
 {
 }
 
@@ -284,7 +285,8 @@ void _se_translator(unsigned int u, EXCEPTION_POINTERS* pExp)
 		// TODO: allow recovering from a page fault
 		//GetCurrentPPUThread().Stop();
 		Emu.Pause();
-		throw fmt::Format("Access violation: addr = 0x%x", (u32)addr);
+		throw fmt::Format("Access violation: addr = 0x%x (last_syscall=0x%llx)",
+			(u32)addr, (u64)GetCurrentCPUThread()->m_last_syscall);
 	}
 	else
 	{
diff --git a/rpcs3/Emu/CPU/CPUThread.h b/rpcs3/Emu/CPU/CPUThread.h
index 343f992d8f..2ecd40ad4a 100644
--- a/rpcs3/Emu/CPU/CPUThread.h
+++ b/rpcs3/Emu/CPU/CPUThread.h
@@ -133,6 +133,7 @@ public:
 	bool m_is_interrupt;
 	bool m_has_interrupt;
 	u64 m_interrupt_arg;
+	u64 m_last_syscall;
 
 protected:
 	CPUThread(CPUThreadType type);
diff --git a/rpcs3/Emu/Cell/PPUInterpreter.h b/rpcs3/Emu/Cell/PPUInterpreter.h
index 2f793db9c9..3f27b769ca 100644
--- a/rpcs3/Emu/Cell/PPUInterpreter.h
+++ b/rpcs3/Emu/Cell/PPUInterpreter.h
@@ -66,6 +66,7 @@ private:
 
 	void SysCall()
 	{
+		CPU.m_last_syscall = CPU.GPR[11];
 		SysCalls::DoSyscall(CPU.GPR[11]);
 
 		if(Ini.HLELogging.GetValue())
@@ -81,6 +82,8 @@ private:
 #ifdef HLE_CALL_DEBUG
 		LOG_NOTICE(PPU, "SysCall[%lld] done with code [0x%llx]! #pc: 0x%llx", CPU.GPR[11], CPU.GPR[3], CPU.PC);
 #endif
+
+		CPU.m_last_syscall = 0;
 	}
 
 	void NULL_OP()
diff --git a/rpcs3/Emu/SysCalls/Modules/cellSync.cpp b/rpcs3/Emu/SysCalls/Modules/cellSync.cpp
index 6146a3fcc1..c19f1e27db 100644
--- a/rpcs3/Emu/SysCalls/Modules/cellSync.cpp
+++ b/rpcs3/Emu/SysCalls/Modules/cellSync.cpp
@@ -1025,113 +1025,219 @@ s32 cellSyncQueueClear(mem_ptr_t<CellSyncQueue> queue)
 
 int cellSyncLFQueueGetEntrySize()
 {
-	UNIMPLEMENTED_FUNC(cellSync);
+	cellSync->Todo("cellSyncLFQueueGetEntrySize()");
 	return CELL_OK;
 }
+
 int cellSyncLFQueueSize()
 {
-	UNIMPLEMENTED_FUNC(cellSync);
+	cellSync->Todo("cellSyncLFQueueSize()");
 	return CELL_OK;
 }
 
 int cellSyncLFQueueClear()
 {
-	UNIMPLEMENTED_FUNC(cellSync);
+	cellSync->Todo("cellSyncLFQueueClear()");
 	return CELL_OK;
 }
+
 int _cellSyncLFQueueCompletePushPointer2()
 {
-	UNIMPLEMENTED_FUNC(cellSync);
+	cellSync->Todo("_cellSyncLFQueueCompletePushPointer2()");
 	return CELL_OK;
 }
 
 int _cellSyncLFQueueGetPopPointer2()
 {
-	UNIMPLEMENTED_FUNC(cellSync);
+	cellSync->Todo("_cellSyncLFQueueGetPopPointer2()");
 	return CELL_OK;
 }
 
 int _cellSyncLFQueueCompletePushPointer()
 {
-	UNIMPLEMENTED_FUNC(cellSync);
+	cellSync->Todo("_cellSyncLFQueueCompletePushPointer()");
 	return CELL_OK;
 }
 
 int _cellSyncLFQueueAttachLv2EventQueue()
 {
-	UNIMPLEMENTED_FUNC(cellSync);
+	cellSync->Todo("_cellSyncLFQueueAttachLv2EventQueue()");
 	return CELL_OK;
 }
 
 int _cellSyncLFQueueGetPushPointer2()
 {
-	UNIMPLEMENTED_FUNC(cellSync);
+	cellSync->Todo("_cellSyncLFQueueGetPushPointer2()");
 	return CELL_OK;
 }
 
 int _cellSyncLFQueueGetPopPointer()
 {
-	UNIMPLEMENTED_FUNC(cellSync);
+	cellSync->Todo("_cellSyncLFQueueGetPopPointer()");
 	return CELL_OK;
 }
 
 int _cellSyncLFQueueCompletePopPointer2()
 {
-	UNIMPLEMENTED_FUNC(cellSync);
+	cellSync->Todo("_cellSyncLFQueueCompletePopPointer2()");
 	return CELL_OK;
 }
 
 int _cellSyncLFQueueDetachLv2EventQueue()
 {
-	UNIMPLEMENTED_FUNC(cellSync);
+	cellSync->Todo("_cellSyncLFQueueDetachLv2EventQueue()");
 	return CELL_OK;
 }
 
-int cellSyncLFQueueInitialize()
+void syncLFQueueInitialize(mem_ptr_t<CellSyncLFQueue> ea, u32 buffer_addr, u32 size, u32 depth, CellSyncQueueDirection direction, u32 eaSignal_addr)
 {
-	UNIMPLEMENTED_FUNC(cellSync);
+
+}
+
+int cellSyncLFQueueInitialize(mem_ptr_t<CellSyncLFQueue> ea, u32 buffer_addr, u32 size, u32 depth, CellSyncQueueDirection direction, u32 eaSignal_addr)
+{
+	cellSync->Todo("cellSyncLFQueueInitialize(ea_addr=0x%x, buffer_addr=0x%x, size=0x%x, depth=0x%x, direction=%d, eaSignal_addr=0x%x)",
+		ea.GetAddr(), buffer_addr, size, depth, direction, eaSignal_addr);
+
+	if (!ea)
+	{
+		return CELL_SYNC_ERROR_NULL_POINTER;
+	}
+	if (size)
+	{
+		if (!buffer_addr)
+		{
+			return CELL_SYNC_ERROR_NULL_POINTER;
+		}
+		if (size > 0x4000 || size % 16)
+		{
+			return CELL_SYNC_ERROR_INVAL;
+		}
+	}
+	if (!depth || (depth >> 15) || direction > 3)
+	{
+		return CELL_SYNC_ERROR_INVAL;
+	}
+	if (ea.GetAddr() % 128 || buffer_addr % 16)
+	{
+		return CELL_SYNC_ERROR_ALIGN;
+	}
+
+	// prx: get sdk version of current process, return non-zero result of sys_process_get_sdk_version
+	s32 sdk_ver;
+	s32 ret = process_get_sdk_version(process_getpid(), sdk_ver);
+	if (ret != CELL_OK)
+	{
+		return ret;
+	}
+	if (sdk_ver == -1)
+	{
+		sdk_ver = 0x460000;
+	}
+
+	// prx: reserve u32 at 0x2c offset
+	u32 old_value;
+	while (true)
+	{
+		const u32 old_data = ea->m_data1();
+		CellSyncLFQueue new_data;
+		new_data.m_data1() = old_data;
+
+		if (old_data)
+		{
+			if (sdk_ver > 0x17ffff && old_data != se32(2))
+			{
+				return CELL_SYNC_ERROR_STAT;
+			}
+			old_value = old_data;
+		}
+		else
+		{
+			if (sdk_ver > 0x17ffff)
+			{
+				for (u32 i = 0; i < sizeof(CellSyncLFQueue) / sizeof(u64); i++)
+				{
+					if ((u64&)Memory[ea.GetAddr() + i * sizeof(u64)])
+					{
+						return CELL_SYNC_ERROR_STAT;
+					}
+				}
+			}
+			new_data.m_data1() = se32(1);
+			old_value = se32(1);
+		}
+		
+		if (InterlockedCompareExchange(&ea->m_data1(), new_data.m_data1(), old_data) == old_data) break;
+	}
+
+	if (old_value == se32(2))
+	{
+		if ((u32)ea->m_size != size || (u32)ea->m_depth != depth || (u64)ea->m_buffer != (u64)buffer_addr)
+		{
+			return CELL_SYNC_ERROR_INVAL;
+		}
+		if (sdk_ver > 0x17ffff)
+		{
+			if ((u64)ea->m_eaSignal != (u64)eaSignal_addr || (u32)ea->m_direction != direction)
+			{
+				return CELL_SYNC_ERROR_INVAL;
+			}
+		}
+	}
+	else
+	{
+		// prx: call internal function with same arguments
+
+
+		// prx: sync, zeroize u32 at 0x2c offset
+		InterlockedCompareExchange(&ea->m_data1(), 0, 0);
+		ea->m_data1() = 0;
+	}
+
+	// prx: sync
+	InterlockedCompareExchange(&ea->m_data1(), 0, 0);
 	return CELL_OK;
 }
 
 int _cellSyncLFQueueGetSignalAddress()
 {
-	UNIMPLEMENTED_FUNC(cellSync);
+	cellSync->Todo("_cellSyncLFQueueGetSignalAddress()");
 	return CELL_OK;
 }
 
 int _cellSyncLFQueuePushBody()
 {
-	UNIMPLEMENTED_FUNC(cellSync);
+	cellSync->Todo("_cellSyncLFQueuePushBody()");
 	return CELL_OK;
 }
 
 int cellSyncLFQueueGetDirection()
 {
-	UNIMPLEMENTED_FUNC(cellSync);
+	cellSync->Todo("cellSyncLFQueueGetDirection()");
 	return CELL_OK;
 }
 
 int cellSyncLFQueueDepth()
 {
-	UNIMPLEMENTED_FUNC(cellSync);
+	cellSync->Todo("cellSyncLFQueueDepth()");
 	return CELL_OK;
 }
 
 int _cellSyncLFQueuePopBody()
 {
-	UNIMPLEMENTED_FUNC(cellSync);
+	cellSync->Todo("_cellSyncLFQueuePopBody()");
 	return CELL_OK;
 }
 
 int _cellSyncLFQueueGetPushPointer()
 {
-	UNIMPLEMENTED_FUNC(cellSync);
+	cellSync->Todo("_cellSyncLFQueueGetPushPointer()");
 	return CELL_OK;
 }
 
 int _cellSyncLFQueueCompletePopPointer()
 {
-	UNIMPLEMENTED_FUNC(cellSync);
+	cellSync->Todo("_cellSyncLFQueueCompletePopPointer()");
 	return CELL_OK;
 }
 
diff --git a/rpcs3/Emu/SysCalls/Modules/cellSync.h b/rpcs3/Emu/SysCalls/Modules/cellSync.h
index 4e24b4cbad..ff941b65d4 100644
--- a/rpcs3/Emu/SysCalls/Modules/cellSync.h
+++ b/rpcs3/Emu/SysCalls/Modules/cellSync.h
@@ -85,4 +85,41 @@ struct CellSyncQueue
 	};
 };
 
-static_assert(sizeof(CellSyncQueue) == 32, "CellSyncQueue: wrong size");
\ No newline at end of file
+static_assert(sizeof(CellSyncQueue) == 32, "CellSyncQueue: wrong size");
+
+enum CellSyncQueueDirection : u32
+{
+	CELL_SYNC_QUEUE_SPU2SPU = 0, // SPU to SPU
+	CELL_SYNC_QUEUE_SPU2PPU = 1, // SPU to PPU
+	CELL_SYNC_QUEUE_PPU2SPU = 2, // PPU to SPU
+	CELL_SYNC_QUEUE_ANY2ANY = 3, // SPU/PPU to SPU/PPU
+};
+
+struct CellSyncLFQueue
+{
+	be_t<u64> m_v1;
+	be_t<u64> m_v2;
+	be_t<u32> m_size;
+	be_t<u32> m_depth;
+	be_t<u64> m_buffer;
+	be_t<u32> m_v5;
+	be_t<CellSyncQueueDirection> m_direction;
+	be_t<u64> m_v6;
+	be_t<u64> m_v7;
+	be_t<u64> m_v8;
+	be_t<u64> m_v9;
+	be_t<u64> m_v10;
+	be_t<u64> m_v11;
+	be_t<u64> m_v12;
+	be_t<u64> m_v13;
+	be_t<u64> m_v14;
+	be_t<u64> m_eaSignal;
+	be_t<u64> reserved;
+
+	volatile u32& m_data1()
+	{
+		return *reinterpret_cast<u32*>((u8*)this + 0x2c);
+	}
+};
+
+static_assert(sizeof(CellSyncLFQueue) == 128, "CellSyncLFQueue: wrong size");
\ No newline at end of file
diff --git a/rpcs3/Emu/SysCalls/lv2/sys_process.cpp b/rpcs3/Emu/SysCalls/lv2/sys_process.cpp
index ecb7f302bc..f36e417ec2 100644
--- a/rpcs3/Emu/SysCalls/lv2/sys_process.cpp
+++ b/rpcs3/Emu/SysCalls/lv2/sys_process.cpp
@@ -10,10 +10,16 @@ SysCallBase sc_p("Process");
 
 sysProcessObjects_t procObjects;
 
+s32 process_getpid()
+{
+	// TODO: get current process id
+	return 1;
+}
+
 s32 sys_process_getpid()
 {
 	sc_p.Log("sys_process_getpid() -> 1");
-	return 1;
+	return process_getpid();
 }
 
 s32 sys_process_getppid()
@@ -228,12 +234,29 @@ s32 sys_process_get_paramsfo(mem8_ptr_t buffer)
 	return CELL_OK;*/
 }
 
+s32 process_get_sdk_version(u32 pid, s32& ver)
+{
+	// TODO: get correct SDK version for selected pid
+	ver = Emu.m_sdk_version;
+
+	return CELL_OK;
+}
+
 s32 sys_process_get_sdk_version(u32 pid, mem32_t version)
 {
 	sc_p.Warning("sys_process_get_sdk_version(pid=%d, version_addr=0x%x)", pid, version.GetAddr());
 
-	version = 0x360001; // TODO
-	return CELL_OK;
+	s32 sdk_ver;
+	s32 ret = process_get_sdk_version(pid, sdk_ver);
+	if (ret != CELL_OK)
+	{
+		return ret; // error code
+	}
+	else
+	{
+		version = sdk_ver;
+		return CELL_OK;
+	}
 }
 
 s32 sys_process_kill(u32 pid)
diff --git a/rpcs3/Emu/SysCalls/lv2/sys_process.h b/rpcs3/Emu/SysCalls/lv2/sys_process.h
index 3ec275818b..8d14099c05 100644
--- a/rpcs3/Emu/SysCalls/lv2/sys_process.h
+++ b/rpcs3/Emu/SysCalls/lv2/sys_process.h
@@ -51,6 +51,10 @@ struct sysProcessObjects_t
 // Extern
 extern sysProcessObjects_t procObjects;
 
+// Auxiliary functions
+s32 process_getpid();
+s32 process_get_sdk_version(u32 pid, s32& ver);
+
 // SysCalls
 s32 sys_process_getpid();
 s32 sys_process_getppid();
diff --git a/rpcs3/Emu/SysCalls/lv2/sys_rwlock.cpp b/rpcs3/Emu/SysCalls/lv2/sys_rwlock.cpp
index f1eb9d6936..98d8dd60b2 100644
--- a/rpcs3/Emu/SysCalls/lv2/sys_rwlock.cpp
+++ b/rpcs3/Emu/SysCalls/lv2/sys_rwlock.cpp
@@ -10,11 +10,6 @@ s32 sys_rwlock_create(mem32_t rw_lock_id, mem_ptr_t<sys_rwlock_attribute_t> attr
 {
 	sys_rwlock.Warning("sys_rwlock_create(rw_lock_id_addr=0x%x, attr_addr=0x%x)", rw_lock_id.GetAddr(), attr.GetAddr());
 
-	if (!rw_lock_id.GetAddr() || !attr.GetAddr())
-	{
-		return CELL_EFAULT;
-	}
-
 	switch (attr->attr_protocol.ToBE())
 	{
 	case se(attr->attr_protocol, SYS_SYNC_PRIORITY): sys_rwlock.Todo("SYS_SYNC_PRIORITY"); break;
diff --git a/rpcs3/Emu/SysCalls/lv2/sys_spu.cpp b/rpcs3/Emu/SysCalls/lv2/sys_spu.cpp
index 0d393eaec1..efb280d2c0 100644
--- a/rpcs3/Emu/SysCalls/lv2/sys_spu.cpp
+++ b/rpcs3/Emu/SysCalls/lv2/sys_spu.cpp
@@ -298,7 +298,7 @@ s32 sys_spu_thread_group_join(u32 id, mem32_t cause, mem32_t status)
 			}
 			if (Emu.IsStopped())
 			{
-				LOG_WARNING(Log::SPU, "sys_spu_thread_group_join(id=%d, ...) aborted", id);
+				LOG_WARNING(Log::SPU, "sys_spu_thread_group_join(id=%d) aborted", id);
 				return CELL_OK;
 			}
 			std::this_thread::sleep_for(std::chrono::milliseconds(1));
diff --git a/rpcs3/Emu/System.cpp b/rpcs3/Emu/System.cpp
index 87d9b12369..0745e1c49c 100644
--- a/rpcs3/Emu/System.cpp
+++ b/rpcs3/Emu/System.cpp
@@ -16,7 +16,7 @@
 
 #include "Emu/CPU/CPUThreadManager.h" //gui dependency
 
-#include "../Loader/PSF.h"
+#include "Loader/PSF.h"
 
 #include "../Crypto/unself.h"
 #include <cstdlib>
@@ -270,6 +270,26 @@ void Emulator::Load()
 		return;
 	}
 
+	// setting default values
+	Emu.m_sdk_version = -1; // possibly "unknown" value
+
+	// trying to load some info from PARAM.SFO
+	vfsFile f2("/app_home/PARAM.SFO");
+	if (f2.IsOpened())
+	{
+		PSFLoader psf(f2);
+		if (psf.Load(false))
+		{
+			std::string version = psf.GetString("PS3_SYSTEM_VER");
+
+			const size_t dot = version.find('.');
+			if (dot != std::string::npos)
+			{
+				Emu.m_sdk_version = (std::stoi(version, nullptr, 16) << 20) | ((std::stoi(version.substr(dot + 1), nullptr, 16) & 0xffff) << 4) | 1;
+			}
+		}
+	}
+
 	LoadPoints(BreakPointsDBName);
 
 	CPUThread& thread = GetCPU().AddThread(thread_type);
diff --git a/rpcs3/Emu/System.h b/rpcs3/Emu/System.h
index 7052d05118..f2500878ac 100644
--- a/rpcs3/Emu/System.h
+++ b/rpcs3/Emu/System.h
@@ -106,6 +106,7 @@ public:
 	std::string m_path;
 	std::string m_elf_path;
 	std::string m_title_id;
+	s32 m_sdk_version;
 
 	Emulator();