Ensure arch:👿:StackPointer has defined representation

src/arch/aarch64.rs

@@ -52,6 +52,7 @@ use stack::Stack;
 pub const STACK_ALIGNMENT: usize = 16;
 
 #[derive(Debug, Clone, Copy)]
+#[repr(transparent)]
 pub struct StackPointer(*mut usize);
 
 pub unsafe fn init(stack: &Stack, f: unsafe extern "C" fn(usize, StackPointer) -> !) -> StackPointer {

src/arch/or1k.rs

@@ -47,6 +47,7 @@ use stack::Stack;
 pub const STACK_ALIGNMENT: usize = 4;
 
 #[derive(Debug, Clone, Copy)]
+#[repr(transparent)]
 pub struct StackPointer(*mut usize);
 
 pub unsafe fn init(stack: &Stack, f: unsafe extern "C" fn(usize, StackPointer) -> !) -> StackPointer {

src/arch/x86.rs

@@ -47,6 +47,7 @@ use stack::Stack;
 pub const STACK_ALIGNMENT: usize = 16;
 
 #[derive(Debug, Clone, Copy)]
+#[repr(transparent)]
 pub struct StackPointer(*mut usize);
 
 pub unsafe fn init(stack: &Stack, f: unsafe extern "C" fn(usize, StackPointer) -> !) -> StackPointer {

src/arch/x86_64.rs

@@ -52,6 +52,7 @@ use stack::Stack;
 pub const STACK_ALIGNMENT: usize = 16;
 
 #[derive(Debug, Clone, Copy)]
+#[repr(transparent)]
 pub struct StackPointer(*mut usize);
 
 pub unsafe fn init(stack: &Stack, f: unsafe extern "C" fn(usize, StackPointer) -> !) -> StackPointer {