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What are the %fs and %gs registers?

In x64-bit assembly, what are the %fs and %gs registers?

For example:
mov    %fs:0x28,%rax
0
pzkhan
Asked:
pzkhan
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1 Solution
 
käµfm³d 👽Commented:
According to this page, they are "segment registers". Here they are mentioned as "extra" and possibly used for special instructions.
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pzkhanAuthor Commented:
Do you understand what that instruction might be doing?
I suppose that was my ultimate question, but not what I asked so I owe you some points :-)
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käµfm³d 👽Commented:
Unfortunately assembly is not my forte. I would hold out for someone more versed in that area. Sorry  : \
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