syscall descriptor table

[Xin Tong]

Can anyone please describe to me how x86 syscall works ( i.e. how it
is dispatched to the correct function) on x86 ?

mov $1, %eax   ;; __NR_exit = 1
mov $42, %ebx  ;; status = 42
sysenter       ;; perform the syscall!

what does the sysenter instruction do ? what is the difference aganst int 0x80.

Thanks

Xin
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