On Mon, 14 Feb 2022, Andre Kempe wrote:
This patch adds optional support for Arm Pointer Authentication Codes.
PAC support is turned on or off at compile time using additional
compiler flags. Unless any of these is enabled explicitly, no additional
code will be emitted at all.
Signed-off-by: André Kempe <andre.ke...@arm.com>
---
libavcodec/aarch64/fft_neon.S | 3 +-
libavcodec/aarch64/mdct_neon.S | 17 ++++-
libavcodec/aarch64/synth_filter_neon.S | 2 +
libavutil/aarch64/asm.S | 102 +++++++++++++++++++++++--
4 files changed, 113 insertions(+), 11 deletions(-)
LGTM, this looks generally correct and consistent to me.
But I realized one thing (which probably should be fixed both here and in
dav1d, but which I guess we can fix separately afterwards too) - I guess
we should only output the .note.gnu.property section if we're targeting
ELF. (I guess that PAC/BTI aren't used on other platforms yet, but it's
plausible that they will be, and then they won't use ELF note sections to
signal it.)
// Martin
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