What does gdb stub need for thread aware debugging on embedded system?

[John Carter <john.carter@tait.co.nz>]

I'm looking to get thread aware debugging running on our "sparc-alike"
Leon II processor.

Unlike the usual sparc stub, I cannot get thread information from
Solaris as we're not running solaris on this device.

If I understand things correctly, getting gdb working should just be a
matter of tying gdb/sparc-stub.c to our serial ports by defining
   extern void putDebugChar();	/* write a single character      */
   extern int getDebugChar();	/* read and return a single char */

Grepping through that code the word "thread" doesn't occur.

What I'm missing is how does gdb get information about threads from
the devices OS to gdb running on the desktop.

Any pointers to the right bit of documentation / code would be most
welcome.




John Carter                             Phone : (64)(3) 358 6639
Tait Electronics                        Fax   : (64)(3) 359 4632
PO Box 1645 Christchurch                Email : john.carter@tait.co.nz
New Zealand