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What means dword ptr?
Basically, it means “the size of the target operand is 32 bits”, so this will bitwise-AND the 32-bit value at the address computed by taking the contents of the ebp register and subtracting four with 0.
What does dword ptr do in assembly?
The dword ptr means “write a doubleword”. Yes, it stands for pointer, because you put a memory address as destination.
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 PTR operator?
The PTR operator specifies a type for a memory address. The type may be one of the following: Type. Description. BIT.
What is the size of dword?
A DWORD is a 32-bit unsigned integer (range: 0 through 4294967295 decimal).
Is dword a directive?
text directives are used to generate byte, word (one word= two bytes), dword (double word = 4 bytes) and text data as in standard 65xx assemblers.
Which directive defines a 8 bit variable?
char directives place one or more 8-bit values into consecutive words of the current section. These directives are similar to . word, . int, and .
Which assembler directive is used to address 32 bit?
equ = define symbolic constants. DB = define byte size variables. DW = define word size (16 bits) variables. DD = define double word size (32 bits) variables.
What does the SIZE directive in dword PTR mean?
The dword ptr part is called a size directive. This page explains them, but it wasn’t possible to direct-link to the correct section. Basically, it means “the size of the target operand is 32 bits”, so this will bitwise-AND the 32-bit value at the address computed by taking the contents of the ebp register and subtracting four with 0.
What is the meaning of ” call DWORD PTR DS “?
call dword ptr ds: [00923030h], meaning call something value in pointer 00923939h in data segment
What is the address of a dword pointer?
Consider the figure enclosed in this other question . ebp-4 is your first local variable and, seen as a dword pointer, it is the address of a 32 bit integer that has to be cleared. Maybe your source starts with It is a 32bit declaration.