There are many different types of compilers which produce output in different useful forms. assembly language, object code, or machine code) to create an executable program. The name "compiler" is primarily used for programs that translate source code from a high-level programming language to a lower level language (e.g.
This _exit got called from return(0) statement.In computing, a compiler is a computer program that translates computer code written in one programming language (the source language) into another language (the target language). We also got the _exit(0) call at last instruction which is the _exit system call with argument status as 0 which signifies to return back to operating system with successful signal.kwrite is system call which actually gets called from the printf function with the value passed to it and this is function is responsible to display the value to console with value passed to it. Another thing we got is the kwrite call with the argument value which one passed to the printf function in our program.Then, Executes a jump instruction to the first instruction of the program which generally causes a page fault and the first page of your instructions is brought into memory.īelow two points are not related to loader and are for just more information:.Page table entries for the instructions, data and program stack are created and the register set is initialized.Reading the file and creating an address space for the process.This loader creates the process which involves: The first call which is displayed is ‘ execve()‘ which actually is the loader. Testing of Loader !kwrite(1, ” T e s t i n g o f L”., 19) = 19 What really happens while running the executable: One could also use strace command for the same. – rwxrwxr – x 1 akash dev 8562 Nov 12 06 : 34 ak1.out akash u / akash) # Akash u / akash) #xlC – o ak1.out./ ak1.cpp akash u / akash) #ls – lrt ak1 * -rw – rw – r– 1 akash dev 74 Nov 12 06 : 10 ak1.cpp
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