[PATCH v7 8/9] ARM: vdso initialization, mapping, and synchronization

Russell King - ARM Linux linux at arm.linux.org.uk
Tue Jul 1 07:14:01 PDT 2014

On Tue, Jul 01, 2014 at 07:09:46AM -0700, Andy Lutomirski wrote:
> On Tue, Jul 1, 2014 at 7:01 AM, Nathan Lynch <Nathan_Lynch at mentor.com> wrote:
> > Hmm, which tools?  Shouldn't they be consulting AT_SYSINFO_EHDR in the
> > auxiliary vector instead?
> >
> There were a bunch of random things written before getauxvec(3) was
> introduced that look for "[vdso]"
> gdb is also a bit weird.  I think it's changed a couple times, but
> IIRC it looks for a vma that has a start address that matches
> AT_SYSINFO_EDHR, and then it parses the ELF header and *section*
> headers (sigh) in that vma.  So if I'm remembering correctly, it just
> won't notice the vdso at all of AT_SYSINFO_EHDR and the vma start
> aren't the same.

Hmm, that would explain the weird error I got when trying gdb with the
vdso in place.

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