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The operating system is responsible for
- gdsarora14 February 19, 2017Process Management (starting, running, stopping processes)
File Management(creating, opening, closing, reading, writing, renaming files)
Memory Management (allocating, deallocating memory)
Other stuff (timing, scheduling, network management)
An application program makes a system call to get the operating system to perform a service for it, like reading from a file.
System calls in 32 bit linux
To make a system call in 32-bit Linux, place the system call number in eax, then its arguments, in order, in ebx, ecx, edx, esi, edi, and ebp, then invoke int 0x80.
Some system calls return information, usually in eax.
All registers are saved across the system call.