When an x86 CALL instruction is executed,
the contents of program counter i.e. address of instruction following CALL, are stored in the stack and the program control is transferred to subroutine.
What does the call instruction do?
The call instruction is
used to call a function
. … It pushes the return address (address immediately after the CALL instruction) on the stack. It changes EIP to the call destination. This effectively transfers control to the call target and begins execution there.
How call instruction is executed?
The call instruction calls near procedures using a full pointer. call
causes the procedure named in the operand to be executed
. When the called procedure completes, execution flow resumes at the instruction following the call instruction (see the return instruction).
When a call instruction is executed the stack pointer is?
Explanation: The stack follows last-in-first-out sequence. 2. If the processor is executing the main program that calls a subroutine, then after executing the main program up to the CALL instruction, the control will be transferred to. a) address of main program.
When the call instruction is executed the topmost element of stack comes out to be?
Explanation: The topmost element of the stack is the
address of the instruction next to the call instruction
so that when RET is executed then PC is filled with that address and so the pointer moves to the main program and continue with its routine task.
What is the instruction size of a call instruction?
The conditional call instructions are
3 Bytes in length
, 1 Byte for the opcode, and another 2 Bytes for the subroutine address i.e.low-order Byte and high-Byte of the address values.
Where the call instructions is stored?
When a subroutine is called, the address of the instruction following the CALL instructions stored in /
on the stack
. The return address associated with a subroutine is stored in either a processor register or in memory called stack. The program counter then fetches the address of the next instruction from the stack.
What is the role of stack during a call instruction?
Stack is used
to store and retrieve return addresses during
function calls. It is also used to transfer arguments to a function. On a microprocessor it is also used to store the status register contents before a context switch.
What are the different instructions uses for the procedure call?
The processor supports procedure calls in two different ways:
CALL and RET instructions
. ENTER and LEAVE instructions, in conjunction with the CALL and RET instructions.
What is a type of call instruction?
oxford. views 3,456,112 updated. call instruction An
instruction that saves the contents of the program counter before branching
to a subroutine or procedure. Compare return instruction.
Which of the following is stack instruction?
In a stack,
push, pop instruction
are used. Stack is amount of program (RAM) memory normally allocated at the top of CPU memory heap and grow (at push instruction the stack pointer is decreased) in opposite direction. A standard term for inserting into stack is push and for remove from stack is pop.
What will be the content of accumulator after the instruction XRA A is executed?
In 8085 Instruction, XRA is a mnemonic that stands for “eXclusive OR Accumulator” and “R” stands for any of the following registers, or memory location M pointed by HL pair. This instruction is used to Ex-OR contents of R with the Accumulator. … It occupies only 1-Byte in memory.
What type of instruction is pop?
| Mnemonics, Operand Opcode(in HEX) Bytes | POP PSW F1 1 |
|---|
Are push and pop instruction are a type of call instruction?
Are PUSH and POP instructions are a type of CALL instructions? Solution: PUSH and POP instructions
are not CALL instructions
because in POP and PUSH instructions the pointer does not move to any location specified by its address which is the fundamental of CALL instruction, so it is not a type of CALL instruction.
Where does a call instruction jump to Mcq?
Explanation: CALL instruction is used to transfer control
anywhere in the 4M memory space available in the AVR
.
What is meaning of instruction MOV A 05H?
data 05H
is stored in the accumulator
. … address 05H is stored in the accumulator.
