diff options
author | Heiko Carstens <hca@linux.ibm.com> | 2022-05-11 14:05:27 +0200 |
---|---|---|
committer | Heiko Carstens <hca@linux.ibm.com> | 2022-05-17 15:16:28 +0200 |
commit | 4c25f0ff6336738fcb03216ae103c3c17908304a (patch) | |
tree | eb909d4d57e104a9f867f395156ee60b453386ce | |
parent | e6ed91fd0768b914558dad5eeda2407a7d871f52 (diff) | |
download | linux-4c25f0ff6336738fcb03216ae103c3c17908304a.tar.gz |
s390/entry: workaround llvm's IAS limitations
llvm's integrated assembler cannot handle immediate values which are calculated with two local labels: <instantiation>:3:13: error: invalid operand for instruction clgfi %r14,.Lsie_done - .Lsie_gmap Workaround this by adding clang specific code which reads the specific value from memory. Since this code is within the hot paths of the kernel and adds an additional memory reference, keep the original code, and add ifdef'ed code. Acked-by: Alexander Gordeev <agordeev@linux.ibm.com> Link: https://lore.kernel.org/r/20220511120532.2228616-5-hca@linux.ibm.com Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
-rw-r--r-- | arch/s390/kernel/entry.S | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index a6b45eaa3450..df41132ccd06 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -172,9 +172,19 @@ _LPP_OFFSET = __LC_LPP lgr %r14,\reg larl %r13,\start slgr %r14,%r13 - lghi %r13,\end - \start - clgr %r14,%r13 +#ifdef CONFIG_AS_IS_LLVM + clgfrl %r14,.Lrange_size\@ +#else + clgfi %r14,\end - \start +#endif jhe \outside_label +#ifdef CONFIG_AS_IS_LLVM + .section .rodata, "a" + .align 4 +.Lrange_size\@: + .long \end - \start + .previous +#endif .endm .macro SIEEXIT |