When does the control passes from user mode to kernel mode in a Linux System?

Question

Anoniem · Accepted Answer

System calls ,H/w Interrupts and last which I did not mention was Exceptions

Arvind Verma · Answer

Well! Exceptions are software interrupts which are synchronous while HW interrupts  are asynchronous and caused by hardware devices connected to machine. Both types of interrupts are taken care by their respective interrupt handlers, the top halves. In either case, to service interrupts, execution switches from user space to kernel space.

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