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[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>
pull/50/head
Michael Brown 2019-07-14 14:05:48 +01:00
parent 1cdf56f751
commit 3fb3ffccea
1 changed files with 2 additions and 2 deletions
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4
src/include/errno.h
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@ -262,10 +262,10 @@ static inline void eplatform_discard ( int dummy __unused, ... ) {}
".align 8\n\t" \
"\n1:\n\t" \
".long ( 4f - 1b )\n\t" \
".long %a0\n\t" \
".long %c0\n\t" \
".long ( 2f - 1b )\n\t" \
".long ( 3f - 1b )\n\t" \
".long %a1\n\t" \
".long %c1\n\t" \
"\n2:\t.asciz \"" __einfo_desc ( einfo ) "\"\n\t" \
"\n3:\t.asciz \"" __FILE__ "\"\n\t" \
".align 8\n\t" \