Commit 9bfe7553 authored by Jason A. Donenfeld's avatar Jason A. Donenfeld Committed by Will Deacon
Browse files

arm64: Implement __lshrti3 library function

Commit fb872273

 ("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: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarJason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent fb872273
......@@ -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)
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