s390/unwind: fix mixing regs and sp

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unwind_for_each_frame stops after the first frame if regs->gprs[15] <=
sp.

The reason is that in case regs are specified, the first frame should be
regs->psw.addr and the second frame should be sp->gprs[8]. However,
currently the second frame is regs->gprs[15], which confuses
outside_of_stack().

Fix by introducing a flag to distinguish this special case from
unwinding the interrupt handler, for which the current behavior is
appropriate.

Fixes: 78c98f9074 ("s390/unwind: introduce stack unwind API")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: stable@vger.kernel.org # v5.2+
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

...

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Ilya Leoshkevich 2019-10-02 13:29:57 +02:00 • committed by Vasily Gorbik

parent b8e51a6a9d

commit a1d863ac3e

2 changed files with 14 additions and 5 deletions

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1

arch/s390/include/asm/unwind.h

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18

arch/s390/kernel/unwind_bc.c

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