Changeset 66236 in vbox for trunk/src/VBox/Runtime/common/asm

Timestamp:

Mar 23, 2017 5:42:56 PM (8 years ago)

Author:

vboxsync

Message:

ASMGetXcr0,ASMSetXcr0: Ported to 16-bit

Location:

trunk/src/VBox/Runtime/common/asm

Files:

• ASMGetXcr0.asm (modified) (1 diff)
• ASMSetXcr0.asm (modified) (1 diff)

trunk/src/VBox/Runtime/common/asm/ASMGetXcr0.asm

@@ -45 +45 @@
         or      rax, rdx
 %endif
+%if ARCH_BITS == 16 ; DX:CX:BX:AX - DX=15:0, CX=31:16, BX=47:32, AX=63:48
+        mov     ebx, edx
+        mov     ecx, eax
+        shr     ecx, 16
+        xchg    eax, edx
+        shr     eax, 16
+%endif
         ret
 ENDPROC ASMGetXcr0

trunk/src/VBox/Runtime/common/asm/ASMSetXcr0.asm

@@ -48 +48 @@
         shr     rdx, 32
         mov     eax, edi
-%elifdef RT_ARCH_X86
+%elif ARCH_BITS == 32
         mov     eax, [esp + 4]
         mov     edx, [esp + 8]
+%elif ARCH_BITS == 16
+        push    bp
+        mov     bp, sp
+        mov     eax, [bp + 4]
+        mov     edx, [bp + 8]
 %else
  %error "Undefined arch?"
 %endif
+
         xor     ecx, ecx
         xsetbv
+
+%if ARCH_BITS == 16
+        leave
+%endif
         ret
 ENDPROC ASMSetXcr0