How does the call instruction works in assembly language?
How does the call instruction works in assembly language?
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).
How does call work in x86?
x86 calling conventions Saves procedure linking information on the stack and branches to the procedure (called procedure) specified with the destination (target) operand. The target operand specifies the address of the first instruction in the called procedure.
What happens on a call instruction?
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.
When CALL instruction is executed?
The CALL instruction is used whenever we need to make a call to some procedure or a subprogram. Whenever a CALL is made, the following process takes place inside the microprocessor: The address of the next instruction that exists in the caller program (after the program CALL instruction) is stored in the stack.
How does a function call work in C?
Series of operations when we call a function:
- Stack Frame is pushed into stack.
- Sub-routine instructions are executed.
- Stack Frame is popped from the stack.
- Now Program Counter is holding the return address.
What is a calling convention in assembly language?
Calling conventions are a standardized method for functions to be implemented and called by the machine. A calling convention specifies the method that a compiler sets up to access a subroutine. In short, the calling convention specifies how a function call in C or C++ is converted into assembly language.
What happens after the execution of call instruction?
After finishing the execution of the subroutine, the RET instruction transfers control back to the caller. Hence, every subroutine has a RET instruction at the end. Stack : Stack is the part in the RAM of CPU to store information temporarily.