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Clear stack before executing guest code (#2877)

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* Clear stack before executing guest code

* clang, don't optimize me 🚨

avoid ClearStack function being optimized in release builds
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Vinicius Rangel 2025-05-07 19:20:55 -03:00 committed by GitHub
parent 1aa7eb8a42
commit 3b7c36e1ba
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1 changed files with 11 additions and 0 deletions
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src/core/tls.h
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@ -5,6 +5,8 @@
#include "common/types.h" #include "common/types.h"
void* memset(void* ptr, int value, size_t num);
namespace Xbyak { namespace Xbyak {
class CodeGenerator; class CodeGenerator;
} }
@ -41,9 +43,18 @@ Tcb* GetTcbBase();
/// Makes sure TLS is initialized for the thread before entering guest. /// Makes sure TLS is initialized for the thread before entering guest.
void EnsureThreadInitialized(); void EnsureThreadInitialized();
template <size_t size>
__attribute__((optnone)) void ClearStack() {
volatile void* buf = alloca(size);
memset(const_cast<void*>(buf), 0, size);
buf = nullptr;
}
template <class ReturnType, class... FuncArgs, class... CallArgs> template <class ReturnType, class... FuncArgs, class... CallArgs>
ReturnType ExecuteGuest(PS4_SYSV_ABI ReturnType (*func)(FuncArgs...), CallArgs&&... args) { ReturnType ExecuteGuest(PS4_SYSV_ABI ReturnType (*func)(FuncArgs...), CallArgs&&... args) {
EnsureThreadInitialized(); EnsureThreadInitialized();
// clear stack to avoid trash from EnsureThreadInitialized
ClearStack<13_KB>();
return func(std::forward<CallArgs>(args)...); return func(std::forward<CallArgs>(args)...);
} }