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selftests/powerpc: Fix earlyclobber in tm-vmxcopy 

In some cases, compiler can allocate the same register for operand 'res'
and 'vecoutptr', resulting in segfault at 'stxvd2x 40,0,%[vecoutptr]'
because base register will contain 1, yielding a false-positive.

This is because output 'res' must be marked as an earlyclobber operand so
it may not overlap an input operand ('vecoutptr').

Signed-off-by: Gustavo Romero <gromero@linux.vnet.ibm.com>
Reviewed-by: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Gustavo Romero 2019-06-17 17:24:58 -04:00 committed by Michael Ellerman
parent 9c4e4c90ec
commit 8d0f1e05ab
1 changed files with 1 additions and 1 deletions
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2
tools/testing/selftests/powerpc/tm/tm-vmxcopy.c
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@ -79,7 +79,7 @@ int test_vmxcopy()
"5:;"
"stxvd2x 40,0,%[vecoutptr];"
: [res]"=r"(aborted)
: [res]"=&r"(aborted)
: [vecinptr]"r"(&vecin),
[vecoutptr]"r"(&vecout),
[map]"r"(a)