[FFmpeg-devel] [PATCH] libavcodec: Remove dynamic relocs from aarch64/h264idct_neon.S
manojgupta at chromium.org
Wed Jan 2 20:12:33 EET 2019
On Mon, Dec 31, 2018 at 8:31 AM Michael Niedermayer
<michael at niedermayer.cc> wrote:
> On Fri, Dec 28, 2018 at 03:12:53PM -0800, Manoj Gupta wrote:
> > Hi All,
> > I recently had a problem building ffmpeg for AArch64 where lld linker
> > complained about text relocations in readonly segment. The following
> > patch fixes the linker complains by referring to a local label instead
> > of function name.
> > This is similar in nature as the following previous commits:
> > https://firstname.lastname@example.org/msg34290.html
> > https://email@example.com/msg34419.html
> > Thanks,
> > Manoj
> > Patch:
> > libavcodec: Remove dynamic relocs from aarch64/h264idct_neon.S
> > Some of the assembly functions e.g. ff_h264_idct_dc_add_neon
> > has code like:
> > movrel x14, X(ff_h264_idct_add_neon)
> > Linker cannot resolve them fully at link time and emits dynamic
> > relocations.
> > Use explicit labels instead so that no dynamic relocations are
> > needed at all.
> > This avoids lld complains about text relocations.
> > For background, see https://crbug.com/917919
> > Signed-off-by: Manoj Gupta <manojgupta at chromium.org>
> > ---
> > libavcodec/aarch64/h264idct_neon.S | 20 ++++++++++++--------
> > 1 file changed, 12 insertions(+), 8 deletions(-)
> Has this been tested on all common aarch64 platforms ?
I have tested this on Chromium with clang+lld linker and Debian
aarch64 cross compiler gcc + bfd linker.
Please let me know if more testing is needed.
> Also git doesnt separate the mail from the commit message and would
> put the wholw email as the commit message, i assume that is not
Sorry for the confusion about the commit message. Only the text
following "Patch:" is intended to be the commit message, but I had
tried to add more context before the
patch text. I am fine with sending a v2 patch just containing the commit msg.
> Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
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