[RFC][v6][PATCH 8/9]: Define clone_with_pids() syscall
Louis.Rilling at kerlabs.com
Fri Sep 11 04:00:56 PDT 2009
On 11/09/09 12:31 +0200, Arnd Bergmann wrote:
> On Thursday 10 September 2009, Sukadev Bhattiprolu wrote:
> > Since this is a variant of clone() and clone is listed as a PTREGSCALL(),
> > I pass in the pt_regs.
> > arch/x86/kernel/entry_32.S lists clone() under this comment:
> > /*
> > * System calls that need a pt_regs pointer.
> > */
> > Is there a guideline on what system calls use/need pt_regs ?
> You need pt_regs if you access any registers from the user task
> other than the argument registers. In case of clone(), this is
> the user stack pointer.
AFAICS clone() actually needs _all_ registers (see x86 copy_thread() for
instance). Any variant of clone() will have this requirement.
Dr Louis Rilling Kerlabs
Skype: louis.rilling Batiment Germanium
Phone: (+33|0) 6 80 89 08 23 80 avenue des Buttes de Coesmes
http://www.kerlabs.com/ 35700 Rennes
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