Re: question about tcb_size in arm

[nick clifton <nickc at redhat dot com>]

Hi Rain,

>     When I read the source code of binutils-2.21.1/bfd/elf32-arm.c, I
> found the tcb size defined here is 8,which is:
>
> /* The size of the thread control block. */
> #define TCB_SIZE 8
>
> well, in my knowledge, the size of thread control block is larger than
> 8 bytes,  so why it is defined 8 bytes here?

I suspect that this is a misnomer.  I think that in this case the 
"thread control block" being referred to is in fact the first few words 
in the .tls section rather than the header for a software thread.  So 
the comment probably ought to read:

  /* The size of the TLS control block.  */

Cheers
  Nick