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| author | David S. Miller <davem@davemloft.net> | 2017-08-15 21:32:19 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-08-16 10:59:54 -0700 |
| commit | 79db795833bf5c3e798bcd7a5aeeee3fb0505927 (patch) | |
| tree | 0717930d26aead122e5405df8c3c15d4347a3ee0 /arch | |
| parent | 9157259d16a8ee8116a98d32f29b797689327e8d (diff) | |
| download | linux-0-day-79db795833bf5c3e798bcd7a5aeeee3fb0505927.tar.gz linux-0-day-79db795833bf5c3e798bcd7a5aeeee3fb0505927.tar.xz | |
sparc64: Don't clibber fixed registers in __multi4.
%g4 and %g5 are fixed registers used by the kernel for the thread
pointer and the per-cpu offset. Use %o4 and %g7 instead.
Diagnosis by Anthony Yznaga.
Fixes: 1b4af13ff2cc ("sparc64: Add __multi3 for gcc 7.x and later.")
Reported-by: Anatoly Pugachev <matorola@gmail.com>
Tested-by: Anatoly Pugachev <matorola@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc/lib/multi3.S | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/arch/sparc/lib/multi3.S b/arch/sparc/lib/multi3.S index d6b6c97fe3c73..703127aaf4a50 100644 --- a/arch/sparc/lib/multi3.S +++ b/arch/sparc/lib/multi3.S @@ -5,26 +5,26 @@ .align 4 ENTRY(__multi3) /* %o0 = u, %o1 = v */ mov %o1, %g1 - srl %o3, 0, %g4 - mulx %g4, %g1, %o1 + srl %o3, 0, %o4 + mulx %o4, %g1, %o1 srlx %g1, 0x20, %g3 - mulx %g3, %g4, %g5 - sllx %g5, 0x20, %o5 - srl %g1, 0, %g4 + mulx %g3, %o4, %g7 + sllx %g7, 0x20, %o5 + srl %g1, 0, %o4 sub %o1, %o5, %o5 srlx %o5, 0x20, %o5 - addcc %g5, %o5, %g5 + addcc %g7, %o5, %g7 srlx %o3, 0x20, %o5 - mulx %g4, %o5, %g4 + mulx %o4, %o5, %o4 mulx %g3, %o5, %o5 sethi %hi(0x80000000), %g3 - addcc %g5, %g4, %g5 - srlx %g5, 0x20, %g5 + addcc %g7, %o4, %g7 + srlx %g7, 0x20, %g7 add %g3, %g3, %g3 movcc %xcc, %g0, %g3 - addcc %o5, %g5, %o5 - sllx %g4, 0x20, %g4 - add %o1, %g4, %o1 + addcc %o5, %g7, %o5 + sllx %o4, 0x20, %o4 + add %o1, %o4, %o1 add %o5, %g3, %g2 mulx %g1, %o2, %g1 add %g1, %g2, %g1 |