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[binutils-gdb] gdb: xtensa-linux: support THREADPTR register


*** TEST RESULTS FOR COMMIT f74f865e5030057deb8a6a56af4a9e003d82cdcd ***

Author: Max Filippov <jcmvbkbc@gmail.com>
Branch: master
Commit: f74f865e5030057deb8a6a56af4a9e003d82cdcd

gdb: xtensa-linux: support THREADPTR register

Make THREADPTR user register accessible.

gdb/
2017-03-27  Max Filippov  <jcmvbkbc@gmail.com>

	* xtensa-linux-nat.c (fill_gregset): Call regcache_raw_collect
	for THREADPTR register.
	(supply_gregset_reg): Call regcache_raw_supply for THREADPTR
	register.
	* xtensa-tdep.c (XTENSA_DBREGN_UREG): New definition.
	(xtensa_derive_tdep): Initialize tdep->threadptr_regnum.
	* xtensa-tdep.h (gdbarch_tdep::threadptr_regnum): New field.


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