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Help Regarding - entry.S file

Hi All,
I was studying the i386/entry.S file for 2.6.20 kernel.
In this file each interrupt handler starts with "
	CFI_STARTPROC simple
	CFI_SIGNAL_FRAME
	CFI_DEF_CFA esp, 0
	CFI_REGISTER esp, ebp"

Some thing like above.

Can any one provide me information about these macros.


Thanks,
nandac

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