[build] Fix use of inline assembly on GCC 8 ARM64 builds
authorMichael Brown <mcb30@ipxe.org>
Sun, 14 Jul 2019 13:05:48 +0000 (14:05 +0100)
committerMichael Brown <mcb30@ipxe.org>
Sun, 14 Jul 2019 13:05:48 +0000 (14:05 +0100)
commit3fb3ffccea717ce10bb29dfd8a9e761c7387626e
treecc548f89faf2b1874ccea15e77c399efb26e9b47
parent1cdf56f75157d5f4dcfb98dee7b1ba60cd6b93c1
[build] Fix use of inline assembly on GCC 8 ARM64 builds

Commit 1a7746603 ("[build] Fix use of inline assembly on GCC 4.8 ARM64
builds") switched from using "%c0" to "%a0" in order to avoid an
"invalid operand prefix" error on the ARM64 version of GCC 4.8.

It appears that the ARM64 version of GCC 8 now produces an "invalid
address mode" error for the "%a0" form, but is happy with the original
"%c0" form.

Switch back to using the "%c0" form, on the assumption that the
requirement for "%a0" was a temporary aberration.

Originally-fixed-by: John L. Jolly <jjolly@suse.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
src/include/errno.h