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Re: Are we going to use "emergency stack" for SYSENTER?
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On 6/5/07, Neo Jia wrote:
hi,
I just found the code in 2.6.17 under function enable_sep_cpu, which
is going to setup the esp1 as "tss->esp1 = sizeof(struct tss_struct) +
(unsigned long) tss;", which will be used as a privilege stack when
calling sysenter.
I noticed that there is unsigned long stack[64] at the bottom of
struct tss_struct, which works as an emergency stack. Are we just
going to use that once as the kernel stack for sysenter? If yes, will
that be a problem since the stack is only 256 bytes?
When do we actually use emregency stack?
Is it used for stack unwinding when we hit a panic or something like that?
Any help?
Thanks
- --psr
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Thanks,
Neo
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