What is word ptr?
In general, PTR operator forces expression to be treated as a pointer of specified type: .DATA num DWORD 0 .CODE mov ax, WORD PTR [num] ; Load a word-size value from a DWORD.
What is byte ptr?
byte ptr -> it simply means that you want to fetch a byte from the address. if it said word ptr or dword ptr , you would get a word or dword from the address in source index.
What is EDI register?
ES:EDI EDI DI : Destination index register Used for string, memory array copying and setting and for far pointer addressing with ES DS:ESI EDI SI : Source index register Used for string and memory array copying SS:EBP EBP BP : Stack Base pointer register Holds the base address of the stack SS:ESP ESP SP : Stack pointer …
What is PTR in assembly?
The dword ptr means “write a doubleword”. Yes, it stands for pointer, because you put a memory address as destination.
What is ESI and EDI register?
•ESI and EDI are general purpose registers. If a variable is to have register storage class, it is. often stored in either ESI or EDI. A few instructions use ESI and EDI as pointers to source and. destination addresses when copying a block of data.
What is BX register?
BX – This is the base register. It is of 16 bits and is divided into two 8-bit registers BH and BL to also perform 8-bit instructions. It is used to store the value of the offset.
What is ESI register?
ESI stands for Employee State Insurance managed by the Employee State Insurance Corporation (ESIC) which is an autonomous body created by the law under the Ministry of Labour and Employment, Government of India.
What is Movsx Assembly?
movsx reads the contents of the register or effective address as a word or byte. movsx then sign-extends the 16- or 32-bit value to the operand-size attribute of the instruction. The result is stored in the destination register by movsx.