switching from user stack to kernel stack

[Kiran Kumar <immidi_kiran@xxxxxxxxx>]

Hi,
  When a process makes a system call, in the kernel
space a separate stack would have to be used. (the one
associated with the task_struct of the process). This
would mean that the %esp would have to be modified in
the system call handler routine. I dont seem to find
out where this is done. ENTRY(system_call) in entry.S
does not seem to be doing this. I would like to know
where the code to switch between user and kernel mode
stacks is.


=====
Regards,
Kiran Kumar Immidi


		
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