[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH v2] Build *-user targets as PIE
From: |
Kirill A. Shutemov |
Subject: |
Re: [Qemu-devel] [PATCH v2] Build *-user targets as PIE |
Date: |
Thu, 3 Sep 2009 18:07:21 +0300 |
On Thu, Sep 3, 2009 at 5:38 PM, Paul Brook<address@hidden> 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.
- [Qemu-devel] Re: [PATCH 2/2] Build *-user targets as PIE, (continued)
- [Qemu-devel] Re: [PATCH 2/2] Build *-user targets as PIE, Paolo Bonzini, 2009/09/02
- Re: [Qemu-devel] [PATCH 2/2] Build *-user targets as PIE, Rtp, 2009/09/02
- Re: [Qemu-devel] [PATCH 2/2] Build *-user targets as PIE, Kirill A. Shutemov, 2009/09/02
- Re: [Qemu-devel] [PATCH 2/2] Build *-user targets as PIE, Rtp, 2009/09/02
- [Qemu-devel] [PATCH v2] Build *-user targets as PIE, Kirill A. Shutemov, 2009/09/03
- Re: [Qemu-devel] [PATCH v2] Build *-user targets as PIE, Reimar Döffinger, 2009/09/03
- Re: [Qemu-devel] [PATCH v2] Build *-user targets as PIE, Kirill A. Shutemov, 2009/09/03
- Re: [Qemu-devel] [PATCH v2] Build *-user targets as PIE, Paul Brook, 2009/09/03
- [Qemu-devel] Re: [PATCH v2] Build *-user targets as PIE, Paolo Bonzini, 2009/09/03
- Re: [Qemu-devel] [PATCH v2] Build *-user targets as PIE,
Kirill A. Shutemov <=
- Re: [Qemu-devel] [PATCH v2] Build *-user targets as PIE, Reimar Döffinger, 2009/09/03
- Re: [Qemu-devel] [PATCH v2] Build *-user targets as PIE, Kirill A. Shutemov, 2009/09/04
- Re: [Qemu-devel] [PATCH v2] Build *-user targets as PIE, Reimar Döffinger, 2009/09/04
- Re: [Qemu-devel] [PATCH v2] Build *-user targets as PIE, Kirill A. Shutemov, 2009/09/04
- Message not available
- [Qemu-devel] Re: [PATCH v2] Build *-user targets as PIE, Kirill A. Shutemov, 2009/09/03
- Re: [Qemu-devel] [PATCH v2] Build *-user targets as PIE, Paul Brook, 2009/09/03
- Re: [Qemu-devel] [PATCH v2] Build *-user targets as PIE, Kirill A. Shutemov, 2009/09/03
Re: [Qemu-devel] [PATCH 2/2] Build *-user targets as PIE, Riku Voipio, 2009/09/02
Message not available