Re: [Qemu-devel] [PATCH v2] Build *-user targets as PIE

["Kirill A. Shutemov" <kirill@shutemov.name>]

On Thu, Sep 3, 2009 at 5:38 PM, Paul Brook<paul@codesourcery.com> wrote:
>> PIE code usually is a bit slower. Approximately, 1% for i386 according to
>> some tests. RISC architectures should be affected less, since they have
>> more registers. On other hand we are getting rid from text relocations on
>> i386 which make executable loading slower. So...
>
> I think you've got that backwards.
> A traditional (fixed address) executable requires no load-time relocation for
> internal references because all addresses are known at static link time. PIE
> require the dynamic linker adjust all absolute addresses.

Usermode qemu on i386 is not a traditional executable, sicne it uses
-Wl,-shared for linking. In result we've got an executable which looks
like PIE, but dynamic linker have to resolve text relocations. I think
the best way it to create a true PIE without a text relocations.

P.S. I press "reply" instead "reply all" first time.