selftests/powerpc: Fix wild_bctr test to work on ppc64
The selftest I recently added to test branching to an out-of-bounds
NIP doesn't work on 64-bit big endian. It does fail but not in the
right way. That is it SEGVs trying to load from the opd at BAD_NIP,
but it never gets as far as branching to BAD_NIP.
To fix it we need to create an opd which is reachable but which holds
the bad address.
Fixes: b7683fc66e
("selftests/powerpc: Add a test of wild bctr")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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@ -105,6 +105,20 @@ static void dump_regs(void)
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}
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}
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#ifdef _CALL_AIXDESC
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struct opd {
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unsigned long ip;
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unsigned long toc;
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unsigned long env;
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};
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static struct opd bad_opd = {
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.ip = BAD_NIP,
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};
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#define BAD_FUNC (&bad_opd)
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#else
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#define BAD_FUNC BAD_NIP
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#endif
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int test_wild_bctr(void)
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{
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int (*func_ptr)(void);
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@ -133,7 +147,7 @@ int test_wild_bctr(void)
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poison_regs();
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func_ptr = (int (*)(void))BAD_NIP;
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func_ptr = (int (*)(void))BAD_FUNC;
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func_ptr();
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FAIL_IF(1); /* we didn't segv? */
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