Commit 4c25f0ff authored by Heiko Carstens's avatar Heiko Carstens

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: default avatarAlexander Gordeev <agordeev@linux.ibm.com>
Link: https://lore.kernel.org/r/20220511120532.2228616-5-hca@linux.ibm.comSigned-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent e6ed91fd
...@@ -172,9 +172,19 @@ _LPP_OFFSET = __LC_LPP ...@@ -172,9 +172,19 @@ _LPP_OFFSET = __LC_LPP
lgr %r14,\reg lgr %r14,\reg
larl %r13,\start larl %r13,\start
slgr %r14,%r13 slgr %r14,%r13
lghi %r13,\end - \start #ifdef CONFIG_AS_IS_LLVM
clgr %r14,%r13 clgfrl %r14,.Lrange_size\@
#else
clgfi %r14,\end - \start
#endif
jhe \outside_label jhe \outside_label
#ifdef CONFIG_AS_IS_LLVM
.section .rodata, "a"
.align 4
.Lrange_size\@:
.long \end - \start
.previous
#endif
.endm .endm
.macro SIEEXIT .macro SIEEXIT
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment