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selftests/powerpc: Add a test of wild bctr

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This tests that a bctr (Branch to counter and link), ie. a function
call, to a wildly out-of-bounds address is handled correctly.

Some old kernel versions didn't handle it correctly, see eg:

  "powerpc/slb: Force a full SLB flush when we insert for a bad EA"
  https://lists.ozlabs.org/pipermail/linuxppc-dev/2017-April/157397.html

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Ellerman
2018-07-24 15:53:22 +10:00
parent 0d923962ab
commit b7683fc66e
4 changed files with 161 additions and 2 deletions
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1
tools/testing/selftests/powerpc/include/reg.h
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@@ -17,6 +17,7 @@
: "memory")
#define mb() asm volatile("sync" : : : "memory");
#define barrier() asm volatile("" : : : "memory");
#define SPRN_MMCR2 769
#define SPRN_MMCRA 770