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authorJason A. Donenfeld <Jason@zx2c4.com>2017-11-07 01:49:54 +0000
committerWill Deacon <will.deacon@arm.com>2017-11-13 16:05:50 +0000
commit9bfe7553fadb269e45a6e10f68b727957dff5676 (patch)
tree4a3b96eb4f96629b74727b2087c8bd0069fa9db5 /arch/arm64/lib
parentfb8722735f50cd51204bfbeefa2e5e7e9ff5b2be (diff)
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arm64: Implement __lshrti3 library function
Commit fb8722735f50 ("arm64: support __int128 on gcc 5+") added support for the __int128 data type, but this breaks the build in some configurations where GCC ends up emitting calls to the __lshrti3 helper in libgcc, which results in a link error: kernel/sched/fair.o: In function `__calc_delta': fair.c:(.text+0xca0): undefined reference to `__lshrti3' kernel/time/timekeeping.o: In function `timekeeping_resume': timekeeping.c:(.text+0x3f60): undefined reference to `__lshrti3' make: *** [vmlinux] Error 1 Fix the build by providing an implementation of __lshrti3, like we do already for __ashlti3 and __ashrti3. Reported-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/lib')
-rw-r--r--arch/arm64/lib/tishift.S21
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/arm64/lib/tishift.S b/arch/arm64/lib/tishift.S
index 7236776655ed..0179a43cc045 100644
--- a/arch/arm64/lib/tishift.S
+++ b/arch/arm64/lib/tishift.S
@@ -57,3 +57,24 @@ ENTRY(__ashrti3)
mov x1, x2
ret
ENDPROC(__ashrti3)
+
+ENTRY(__lshrti3)
+ cbz x2, 1f
+ mov x3, #64
+ sub x3, x3, x2
+ cmp x3, #0
+ b.le 2f
+ lsr x0, x0, x2
+ lsl x3, x1, x3
+ lsr x2, x1, x2
+ orr x0, x0, x3
+ mov x1, x2
+1:
+ ret
+2:
+ neg w0, w3
+ mov x2, #0
+ lsr x0, x1, x0
+ mov x1, x2
+ ret
+ENDPROC(__lshrti3)