.Const
INCLUDE Win_AsmLibrary.inc
.Code
; **********************************************************************************
; *********************** MemoryAlloc **********************************************
; **********************************************************************************
ALIGN 16
PUBLIC MemoryAlloc
MemoryAlloc :
mov rdx,rcx
and rdx,00000000ffffffffh
jnz @F
nop ; If the only instruction after a label is RET
ret ; Place a NOP or REP RET
@@ :
xor rcx,rcx
shl rdx,12
mov r8,MEM_COMMIT or MEM_RESERVE
shr rdx,12 ; Round to multiple of 4096
mov r9,PAGE_EXECUTE_READWRITE
jmp VirtualAlloc
; **********************************************************************************
; *********************** F I N I S H E D ******************************************
; **********************************************************************************
END
Usualy it is a call VirtualAlloc, not a jump. After this call there would be a RET so it is not necessary to make a CALL. Just correct the stack and JUMP.
