What is the execution process of Linux system calls?

What is the execution process of a Linux System Call-general Linux technology-Linux programming and kernel information? For details, refer to the following. When the system calls a function, the system calls the function to execute the int 0x80 interrupt command. At the same time, the system call number is put into the eax register and the parameters to be passed to the system are put into ebx, ecx, in edx. The interrupt handler executes the system_call () function.

The system_call () function first saves the original register and pushes the call parameters to the stack. Then, point ds and es to the kernel data segment. When the cs segment is interrupted, the segment selection character of the interrupt gate is assigned to the kernel code segment, and the original segment selection character is saved to the stack. Then, call the corresponding function. When a function is returned, the kernel checks the running status of the current task. if the task is not in the ready state, the scheduling program is executed. If the system is in the ready state but the time slice is used up, the scheduling program is also executed. When the task continues to be executed, the signal is processed and then returned to the system call function.