Re: [Qemu-devel] qemu-ppc can't run static uClibc binaries.

[Rob Landley]

On Tuesday 16 February 2010 12:36:15 Alexander Graf wrote:
> On 16.02.2010, at 19:31, Rob Landley wrote:
> > Let's see, one of the lines I #ifdefed out (line 535-ish of linux-
> > user/elfload.c) is:
> >
> >    get_user_ual(_regs->gpr[3], pos);
> >
> > Rummage, rummage... get_user_ual() is a wrapper for get_user() which is a
> > wrapper for __get_user() which assigns to its first argument.  So yeah,
> > that's setting _regs->gpr[3] to a nonzero value.
>
> Well I was wondering on the order of execution. If main() already sets the
> GPRs to 0 it should be 0. I assume the elf reading code comes after that?
> If so, your patch looks correct.

The main() code memsets all the registers to zero when the array is allocated, 
then passes the register array as the first argument to the target-specific 
init_thread(), which can initialize them to other values.

So yeah, main() calls  the elf reading code after the memset.

Rob
-- 
Latency is more important than throughput. It's that simple. - Linus Torvalds