0667c50682
I've encountered a GDB crash when trying to read registers from a remote stub that provided a target.xml with vector registers, but without the 'vec128' data type. The crash is caused by NULL register type entries for the "concatenated" pseudo-registers v0-v15. These NULL entries are introduced by the logic in s390_pseudo_register_type(), where the tdesc type 'vec128' is returned unconditionally -- even if it doesn't exist (is NULL). The fixed logic for determining a "concatenated" vector register's type now returns the type of the raw register v16 instead. This also makes sure that all vector register have the same type. gdb/ChangeLog: * s390-tdep.c (s390_pseudo_register_type): For v0-v15 don't yield the possibly non-existent tdesc type 'vec128', but the type of raw register v16 instead.
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