PPC debug setcontext syscall implementation

[Tom Rini]

On Thu, Dec 02, 2004 at 02:41:32PM -0600, Corey Minyard wrote:

> Hello all,
> 
> I have attached a patch with the implementation of the debug_setcontext 
> system call.  The syscall has been reserved for a while and I've posted 
> this before.  So I've ported to the newest kernel and here it is again.
> 
> This syscall allows signal handlers to perform debug functions.  It 
> allows the signal handler to turn on single-stepping, for instance, and 
> the thread will get a trap after executing the next instruction.  It can 
> also (on supported PPC processors) turn on branch tracing and get a trap 
> after the next branch instruction is executed.  This is useful for 
> in-application debugging.

I asked Corey off-list, and this is vs 2.6.10-rc2-mm3.
I propose (and will update the patch tracker
(http://ozlabs.org/ppc32-patches/, I don't recall if/how well it was
advertised)) that so long as KGDB still works (I'll even go test it on
classic) as well as GDB testsuite (this is a 'touchy' area, so I'd like
to well-test changes) is still 'OK', pushing this into 2.6.11.

-- 
Tom Rini
http://gate.crashing.org/~trini/