Changeset 49528 in vbox

Timestamp:

Nov 18, 2013 12:46:50 PM (11 years ago)

Author:

vboxsync

Message:

VMM/VMMSwitcher: Use explicit REX.W prefix for fxsave/fxrstor for 64-bit guests.

File:

• trunk/src/VBox/VMM/VMMSwitcher/LegacyandAMD64.mac (modified) (2 diffs)

trunk/src/VBox/VMM/VMMSwitcher/LegacyandAMD64.mac

@@ -629 +629 @@
     and     rax, ~(X86_CR0_TS | X86_CR0_EM)
     mov     cr0, rax
-    ;; @todo r=ramshankar: Shouldn't we use the explicit REX prefix here!?!
-    fxrstor [rdx + CPUMCPU.Guest.fpu]
+    ; Use explicit REX prefix. See @bugref{6398}.
+    o64 fxrstor [rdx + CPUMCPU.Guest.fpu]
     mov     cr0, rcx                    ; and restore old CR0 again
 
@@ -1223 +1223 @@
     mov     cr0, rax
 
-    ;; @todo r=ramshankar: Shouldn't we use the explicit REX prefix here!?!
-    fxsave  [rsi + CPUMCTX.fpu]
+    ; Use explicit REX prefix. See @bugref{6398}.
+    o64 fxsave  [rsi + CPUMCTX.fpu]
 
     mov     cr0, rcx                    ; and restore old CR0 again