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authorHeiko Carstens <hca@linux.ibm.com>2022-05-11 14:05:27 +0200
committerHeiko Carstens <hca@linux.ibm.com>2022-05-17 15:16:28 +0200
commit4c25f0ff6336738fcb03216ae103c3c17908304a (patch)
treeeb909d4d57e104a9f867f395156ee60b453386ce /arch/s390/kernel/entry.S
parente6ed91fd0768b914558dad5eeda2407a7d871f52 (diff)
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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.S14
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