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[binutils-gdb] S390: Fix internal error with stackless inferior


*** TEST RESULTS FOR COMMIT f24894771e384b1bc60dc0f2c104d7e7fad3c865 ***

Author: Andreas Arnez <arnez@linux.vnet.ibm.com>
Branch: master
Commit: f24894771e384b1bc60dc0f2c104d7e7fad3c865

S390: Fix internal error with stackless inferior

This fixes a GDB internal error that may occur when the inferior has no
valid stack pointer in r15.

gdb/testsuite/ChangeLog:

	* gdb.arch/s390-stackless.S: New.
	* gdb.arch/s390-stackless.exp: New.

gdb/ChangeLog:

	* s390-linux-tdep.c (s390_backchain_frame_unwind_cache): Avoid
	exception when attempting to access the inferior's backchain.


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