src/arch/x86_64/gdt.rs

@@ -143,14 +143,14 @@ pub unsafe fn pcr() -> *mut ProcessorControlRegion {
 pub unsafe fn set_tss_stack(stack: usize) {
     use super::pti::{PTI_CONTEXT_STACK, PTI_CPU_STACK};
     core::ptr::addr_of_mut!((*pcr()).tss.rsp[0])
-        .write((PTI_CPU_STACK.as_ptr() as usize + PTI_CPU_STACK.len()) as u64);
+        .write_unaligned((PTI_CPU_STACK.as_ptr() as usize + PTI_CPU_STACK.len()) as u64);
     PTI_CONTEXT_STACK = stack;
 }
 
 #[cfg(not(feature = "pti"))]
 pub unsafe fn set_tss_stack(stack: usize) {
     // TODO: If this increases performance, read gs:[offset] directly
-    core::ptr::addr_of_mut!((*pcr()).tss.rsp[0]).write(stack as u64);
+    core::ptr::addr_of_mut!((*pcr()).tss.rsp[0]).write_unaligned(stack as u64);
 }
 
 // Initialize startup GDT

src/arch/x86_64/macros.rs

@@ -72,16 +72,16 @@ macro_rules! alternative2(
 macro_rules! alternative_auto(
     ($first_digit:literal, $feature:literal, [$($then:expr),*]) => { concat!(
         ".if ", expand_bool!(cfg!(cpu_feature_auto = $feature)), "
-        .pushsection .altcode.", $feature, "
+        .pushsection .altcode.", $feature, ",\"a\"
         ", $first_digit, "0:
         ", $($then,)* "
         ", $first_digit, "1:
         .popsection
-        .pushsection .altfeatures.", $feature, "
+        .pushsection .altfeatures.", $feature, ",\"a\"
         70: .ascii \"", $feature, "\"
         71:
         .popsection
-        .pushsection .altrelocs.", $feature, "
+        .pushsection .altrelocs.", $feature, ",\"a\"
         .quad 70b
         .quad 71b - 70b
         .quad 40b