Changeset 1991 in vbox

Timestamp:

Apr 9, 2007 11:56:29 AM (18 years ago)

Author:

vboxsync

Message:

Added EMEmulateBts & EMEmulateBtc

File:

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

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

@@ -654 +654 @@
     retn
 ENDPROC     EMEmulateBtr
+
+;;
+; Emulate BTC instruction, CDECL calling conv.
+; EMDECL(uint32_t) EMEmulateBtc(uint32_t *pu32Param1, uint32_t u32Param2);
+;
+; @returns EFLAGS after the operation, only arithmetic flags is valid.
+; @param    [esp + 04h]    Param 1 - First parameter - pointer to data item.
+; @param    [esp + 08h]    Param 2 - Second parameter.
+; @uses     eax, ecx, edx
+;
+align 16
+BEGINPROC   EMEmulateBtc
+%ifdef __AMD64__
+%ifndef __WIN64__
+    mov     rcx, rdi                    ; rcx = first parameter
+    mov     rdx, rsi                    ; rdx = second parameter
+%endif  ; !__WIN64__
+%else   ; !__AMD64__
+    mov     ecx, [esp + 04h]            ; ecx = first parameter
+    mov     edx, [esp + 08h]            ; edx = second parameter
+%endif
+
+    and     edx, 7
+    btc    [MY_PTR_REG], edx
+
+    ; collect flags and return.
+    pushf
+    pop     MY_RET_REG
+    retn
+ENDPROC     EMEmulateBtc
+
+;;
+; Emulate BTS instruction, CDECL calling conv.
+; EMDECL(uint32_t) EMEmulateBts(uint32_t *pu32Param1, uint32_t u32Param2);
+;
+; @returns EFLAGS after the operation, only arithmetic flags is valid.
+; @param    [esp + 04h]    Param 1 - First parameter - pointer to data item.
+; @param    [esp + 08h]    Param 2 - Second parameter.
+; @uses     eax, ecx, edx
+;
+align 16
+BEGINPROC   EMEmulateBts
+%ifdef __AMD64__
+%ifndef __WIN64__
+    mov     rcx, rdi                    ; rcx = first parameter
+    mov     rdx, rsi                    ; rdx = second parameter
+%endif  ; !__WIN64__
+%else   ; !__AMD64__
+    mov     ecx, [esp + 04h]            ; ecx = first parameter
+    mov     edx, [esp + 08h]            ; edx = second parameter
+%endif
+
+    and     edx, 7
+    bts    [MY_PTR_REG], edx
+
+    ; collect flags and return.
+    pushf
+    pop     MY_RET_REG
+    retn
+ENDPROC     EMEmulateBts