cpu: Port cpl_changed to Rust

We leave the JS version too, since it's used by several other JS functions
that we aren't porting yet.

src/browser/starter.js

@@ -213,7 +213,6 @@ function V86Starter(options)
         "verw": function() { return cpu.verw.apply(cpu, arguments); },
         "verr": function() { return cpu.verr.apply(cpu, arguments); },
 
-        "cpl_changed": function() { return cpu.cpl_changed.apply(cpu, arguments); },
         "set_cr0": function() { return cpu.set_cr0.apply(cpu, arguments); },
         "update_cs_size": function() { return cpu.update_cs_size.apply(cpu, arguments); },
         "cpuid": function() { return cpu.cpuid.apply(cpu, arguments); },

src/rust/cpu2/cpu.rs

@@ -892,6 +892,11 @@ pub unsafe fn get_seg(mut segment: i32) -> i32 {
     return *segment_offsets.offset(segment as isize);
 }
 
+pub unsafe fn cpl_changed() {
+    *last_virt_eip = -1;
+    *last_virt_esp = -1;
+}
+
 pub unsafe fn test_privileges_for_io(port: i32, size: i32) -> bool {
     if *protected_mode && (*cpl > getiopl() as u8 || (*flags & FLAG_VM != 0)) {
         if !*tss_size_32 {

src/rust/cpu2/instructions_0f.rs

@@ -21,8 +21,6 @@ extern "C" {
     #[no_mangle]
     fn cpuid();
     #[no_mangle]
-    fn cpl_changed();
-    #[no_mangle]
     fn update_cs_size(cs_size: bool);
     #[no_mangle]
     fn set_cr0(cr0: i32);