What is the EBX register used for?
EBX,BX,BH,BL : Called the Base register It is used as a base pointer for memory access Gets some interrupt return values ECX,CX,CH,CL : Called the Counter register It is used as a loop counter and for shifts Gets some interrupt values EDX,DX,DH,DL : Called the Data register It is used for I/O port access, arithmetic.
WHAT IS EBX in assembly language?
The EAX, EBX, ECX, EDX, EBP, EDI, and ESI registers are all 32-bit general-purpose registers, used for temporary data storage and memory access.
What is AX BX CX DX registers?
AX, BX, CX, and DX are general purpose registers. They can be assigned to any value you want. Of course you need to adjust it into your need. AX is usually called accumulator register, or just accumulator. Most of arithmatical operations are done with AX.
Why registers are used in CPU?
In Computer Architecture, the Registers are very fast computer memory which are used to execute programs and operations efficiently. This does by giving access to commonly used values, i.e., the values which are in the point of operation/execution at that time.
What is the use of CX register Mcq?
Explanation: The instruction to which the REP is prefix, is executed repeatedly until CX register becomes zero. When CX becomes zero, the execution proceeds to the next instruction in sequence.
What is CS register?
Code segment register (CS): is used for addressing memory location in the code segment of the memory, where the executable program is stored. Data segment register (DS): points to the data segment of the memory where the data is stored.
What is SS register?
The stack segment register (SS) is usually used to store information about the memory segment that stores the call stack of currently executed program. SP points to current stack top. By default, the stack grows downward in memory, so newer values are placed at lower memory addresses.
What is the EFL register?
The FLAGS register is the status register that contains the current state of a CPU. The size and meanings of the flag bits are architecture dependent. It usually reflects the result of arithmetic operations as well as information about restrictions placed on the CPU operation at the current time.
What is an EAX register?
A register is a small storage space available as part of the CPU. Registers are 32 bits in size and can be referenced as 16 or 8 bits registers. Here is an example: EAX generally contains the return of a function.
What is the difference between call-preserved registers ESI and EAX?
The ESI, EDI, EBX, EBP, ESP are call-preserved whereas EAX, ECX and EDX are not call-preserved. Call-preserved registers are respected by C library function and their values persist through the C library function calls. Jeff Duntemann in his assembly language book has an example assembly code for printing the command line arguments.
What is the function of Ax and Ax registers?
Data Registers. AX is the primary accumulator; it is used in input/output and most arithmetic instructions. For example, in multiplication operation, one operand is stored in EAX or AX or AL register according to the size of the operand. BX is known as the base register, as it could be used in indexed addressing.
What is the use of EAX and EDX?
EAX generally contains the return of a function. If you see the EAX register just after a function call, chances are that EAX contains the return value of the function. EAX and EDX are always implied in multiplication and division instructions EAX can also be used as a temporary CPU memory for additions: EBP is called the Base Pointer.