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| author | Jason A. Donenfeld <Jason@zx2c4.com> | 2017-11-07 01:49:54 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2017-11-13 16:05:50 +0000 |
| commit | 9bfe7553fadb269e45a6e10f68b727957dff5676 (patch) | |
| tree | 4a3b96eb4f96629b74727b2087c8bd0069fa9db5 | |
| parent | fb8722735f50cd51204bfbeefa2e5e7e9ff5b2be (diff) | |
| download | linux-9bfe7553fadb269e45a6e10f68b727957dff5676.tar.gz | |
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>
| -rw-r--r-- | arch/arm64/lib/tishift.S | 21 |
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) |