Changeset 48540 in vbox for trunk/src/VBox/VMM/VMMAll/CPUMAllA.asm

Timestamp:

Sep 19, 2013 3:38:41 PM (11 years ago)

Author:

vboxsync

Message:

VMM/CPUMAllA.asm: Yasm requires explicit REX prefix for fxsave/rstor. Don't corrupt the FPU state for 64-bit guests.

File:

• trunk/src/VBox/VMM/VMMAll/CPUMAllA.asm (modified) (1 diff)

trunk/src/VBox/VMM/VMMAll/CPUMAllA.asm

@@ -158 +158 @@
 %endif
 
+%ifdef RT_ARCH_AMD64
+    ; Use explicit REX prefix. See @bugref{6398}.
+    o64 fxsave  [xDX + CPUMCPU.Host.fpu]
+%else
     fxsave  [xDX + CPUMCPU.Host.fpu]
+%endif
     or      dword [xDX + CPUMCPU.fUseFlags], (CPUM_USED_FPU | CPUM_USED_FPU_SINCE_REM)
     fxrstor [xDX + CPUMCPU.Guest.fpu]