Supporting emulated tls

[Jacob Carlborg]

On 2012-03-23 06:03, Martin Nowak wrote:
> On Mon, 19 Mar 2012 10:40:25 +0100, Jacob Carlborg <doob at me.com> wrote:
>
>> As I understand it, in the native ELF implementation, assembly is used
>> to access the current module id, this is for FreeBSD:
>> http://people.freebsd.org/~marcel/tls.html
>> This is how ___tls_get_addr is implemented on FreeBSD ELF i386:
>> https://bitbucket.org/freebsd/freebsd-head/src/4e8f50fe2f05/libexec/rtld-elf/i386/reloc.c#cl-355
>>
>
> Not quite.
> Access to the static image is done through %fs relative addressing
> which is super-fast and requires no runtime linking.
> The general dynamic addressing needs one tls_index
> struct in the GOT for every variable and a call to
> _tls_get_addr(tls_index*).
> The module index and the offset are filled by the runtime linker.

Ok, I see.

-- 
/Jacob Carlborg