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| 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 /arch/s390/kernel/entry.S | |
| parent | s390/alternatives: remove padding generation code (diff) | |
| download | linux-dev-4c25f0ff6336738fcb03216ae103c3c17908304a.tar.xz linux-dev-4c25f0ff6336738fcb03216ae103c3c17908304a.zip | |
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>
Diffstat (limited to 'arch/s390/kernel/entry.S')
| -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 |