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block_of_code: Hide NX support behind compiler flag

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Systems that require W^X can use the DYNARMIC_ENABLE_NO_EXECUTE_SUPPORT cmake option.
This commit is contained in:
MerryMage 2018-08-23 20:52:50 +01:00
parent de4494ffa5
commit d5b9c4a4bb
3 changed files with 13 additions and 1 deletions
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8
src/backend/x64/block_of_code.cpp
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@ -51,12 +51,15 @@ constexpr size_t CONSTANT_POOL_SIZE = 2 * 1024 * 1024;
class CustomXbyakAllocator : public Xbyak::Allocator {
public:
#ifdef DYNARMIC_ENABLE_NO_EXECUTE_SUPPORT
bool useProtect() const override { return false; }
#endif
};
// This is threadsafe as Xbyak::Allocator does not contain any state; it is a pure interface.
CustomXbyakAllocator s_allocator;
#ifdef DYNARMIC_ENABLE_NO_EXECUTE_SUPPORT
void ProtectMemory(const void* base, size_t size, bool is_executable) {
#ifdef _WIN32
DWORD oldProtect = 0;
@ -69,6 +72,7 @@ void ProtectMemory(const void* base, size_t size, bool is_executable) {
mprotect(reinterpret_cast<void*>(roundAddr), size + (iaddr - roundAddr), mode);
#endif
}
#endif
} // anonymous namespace
@ -92,11 +96,15 @@ void BlockOfCode::PreludeComplete() {
}
void BlockOfCode::EnableWriting() {
#ifdef DYNARMIC_ENABLE_NO_EXECUTE_SUPPORT
ProtectMemory(getCode(), maxSize_, false);
#endif
}
void BlockOfCode::DisableWriting() {
#ifdef DYNARMIC_ENABLE_NO_EXECUTE_SUPPORT
ProtectMemory(getCode(), maxSize_, true);
#endif
}
void BlockOfCode::ClearCache() {