linux-kernel - syscall descriptor table

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Message-ID: <CALKntY2MONLeRvXs2xdamSAQeWDs4ERHjWuCxNL8_QRrHwVhqg@mail.gmail.com>
Date:	Thu, 5 Apr 2012 17:55:43 -0400
From:	Xin Tong <xerox.time.tech@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: syscall descriptor table

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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