From ca398e04feecfa2e84dc276c2d602035e65724b8 Mon Sep 17 00:00:00 2001
From: sayantn <sayantn05@gmail.com>
Date: Wed, 17 Dec 2025 01:41:29 +0530
Subject: [PATCH] panic if cpuid is called with SGX

---
 library/stdarch/crates/core_arch/src/x86/cpuid.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/library/stdarch/crates/core_arch/src/x86/cpuid.rs b/library/stdarch/crates/core_arch/src/x86/cpuid.rs
index 84dcf75492b3..b35699bd7ab2 100644
--- a/library/stdarch/crates/core_arch/src/x86/cpuid.rs
+++ b/library/stdarch/crates/core_arch/src/x86/cpuid.rs
@@ -59,6 +59,10 @@ pub struct CpuidResult {
 #[cfg_attr(test, assert_instr(cpuid))]
 #[stable(feature = "simd_x86", since = "1.27.0")]
 pub fn __cpuid_count(leaf: u32, sub_leaf: u32) -> CpuidResult {
+    if cfg!(target_env = "sgx") {
+        panic!("`__cpuid` cannot be used in SGX");
+    }
+
     let eax;
     let ebx;
     let ecx;