TLS on amd64
Daniel.Mueller at mailbox.tu-dresden.de
Thu Jul 14 20:39:48 CEST 2011
On 13.07.2011 22:38, Adam Lackorzynski wrote:
> On Wed Jul 13, 2011 at 22:10:15 +0200, Daniel Müller wrote:
>> I want to use the __thread keyword gcc provides. I was told this was
>> recently adjusted to work (at least in the private repository which I am
>> using). It appears to be working when building for IA32 but when I
>> compile the same program for amd64 I get a page fault when running it
>> (it is a simple program just incrementing a __thread declared int).
>> It faults at 10010f4 (the first access of the variable).
>> 00000000010010f0 <main>:
>> 10010f0: 48 83 ec 08 sub rsp,0x8
>> 10010f4: 64 c7 04 25 fc ff ff mov DWORD PTR
>> 10010fb: ff 00 00 00 00
>> 1001100: bf 60 48 01 01 mov edi,0x1014860
>> 1001105: e8 36 88 00 00 call 1009940 <puts>
>> 100110a: 64 83 04 25 fc ff ff add DWORD PTR
>> 1001111: ff 01
>> 1001113: bf 01 00 00 00 mov edi,0x1
>> 1001118: e8 d3 71 00 00 call 10082f0 <sleep>
>> 100111d: eb e1 jmp 1001100 <main+0x10>
>> 100111f: 90 nop
>> Is TLS for amd64 supposed to work? Any idea on the problem?
> It's currently only supposed to work on x86-32, other archs haven't been
> done yet.
This is unfortunate. Are there plans to fix this in the near future?
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