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#include <string.h>
#include "common.h"
#include "tizenasanenv.h"
template <typename Type, int STACK_SIZE>
class StaticStack {
// We don't create constructor because
// this class is used in a zeroed memory area
public:
void push(Type addr)
{
_ASSERTE(m_pos < STACK_SIZE);
m_data[m_pos++] = addr;
}
void pop()
{
_ASSERTE(m_pos > 0);
--m_pos;
}
Type top()
{
_ASSERTE(m_pos > 0);
return m_data[m_pos - 1];
}
bool empty()
{
return m_pos == 0;
}
private:
int m_pos;
Type m_data[STACK_SIZE];
};
#include <pshpack1.h>
struct AuxiliaryCalls {
LPVOID target;
void (*pushAddr)(LPVOID addr);
LPVOID (*popAddr)();
};
extern "C" void __sanitizer_disable_interceptors();
extern "C" void __sanitizer_enable_interceptors();
extern LPVOID tizenASanWrapper;
extern UINT32 tizenASanWrapperSize;
extern UINT32 tizenASanWrapperEntryOffset;
static __thread StaticStack<LPVOID, 128> s_retaddrStack;
static __thread int s_enableCounter;
static void TryEnable()
{
if (s_enableCounter == 0)
__sanitizer_enable_interceptors();
++s_enableCounter;
}
static void TryDisable()
{
if (s_enableCounter == 1)
__sanitizer_disable_interceptors();
--s_enableCounter;
}
namespace TizenASanEnv {
void PushAndDisableASan(LPVOID addr)
{
TryDisable();
s_retaddrStack.push(addr);
}
LPVOID PopAndEnableASan()
{
LPVOID addr = s_retaddrStack.top();
s_retaddrStack.pop();
TryEnable();
return addr;
}
void PushAndEnableASan(LPVOID addr)
{
s_retaddrStack.push(addr);
TryEnable();
}
LPVOID PopAndDisableASan()
{
TryDisable();
LPVOID addr = s_retaddrStack.top();
s_retaddrStack.pop();
return addr;
}
LPVOID CreateWrapper(LPVOID target, void (*pushAddr)(LPVOID addr), LPVOID (*popAddr)())
{
_ASSERTE(tizenASanWrapperEntryOffset == sizeof(AuxiliaryCalls));
LPVOID wrapperSpace = (LPVOID)SystemDomain::GetGlobalLoaderAllocator()->GetExecutableHeap()->AllocMem(S_SIZE_T(tizenASanWrapperSize));
AuxiliaryCalls calls = {
.target = target,
.pushAddr = pushAddr,
.popAddr = popAddr,
};
// copy auxiliary calls
memcpy(wrapperSpace, &calls, sizeof(calls));
LPVOID entryPointer = (LPVOID)((UINT_PTR)wrapperSpace + tizenASanWrapperEntryOffset);
LPVOID wrapperEntryPointer = (LPVOID)((UINT_PTR)&tizenASanWrapper + tizenASanWrapperEntryOffset);
UINT32 wrapperCodeSize = tizenASanWrapperSize - tizenASanWrapperEntryOffset;
// copy executable code wrapper
memcpy(entryPointer, wrapperEntryPointer, wrapperCodeSize);
FlushInstructionCache(GetCurrentProcess(), wrapperSpace, tizenASanWrapperSize);
return entryPointer;
}
} // namespace TizenASanEnv
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