From 8ecf47a1e407e3fd5e0423948bdeeb46aad3ff0a Mon Sep 17 00:00:00 2001
From: momo5502 <mauriceheumann@gmail.com>
Date: Sun, 27 Oct 2024 09:46:21 +0100
Subject: [PATCH] Make rdtsc predictable

---
 src/windows-emulator/windows_emulator.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/windows-emulator/windows_emulator.cpp b/src/windows-emulator/windows_emulator.cpp
index 4c52eb3..bd30130 100644
--- a/src/windows-emulator/windows_emulator.cpp
+++ b/src/windows-emulator/windows_emulator.cpp
@@ -796,6 +796,14 @@ void windows_emulator::setup_hooks()
 		return instruction_hook_continuation::skip_instruction;
 	});
 
+	this->emu().hook_instruction(x64_hookable_instructions::rdtsc, [&]
+	{
+		const auto instructions = this->process().executed_instructions;
+		this->emu().reg(x64_register::rax, instructions & 0xFFFFFFFF);
+		this->emu().reg(x64_register::rdx, (instructions >> 32) & 0xFFFFFFFF);
+		return instruction_hook_continuation::skip_instruction;
+	});
+
 	this->emu().hook_instruction(x64_hookable_instructions::invalid, [&]
 	{
 		const auto ip = this->emu().read_instruction_pointer();