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[binutils-gdb] Support the fs_base and gs_base registers on FreeBSD/amd64 native processes.


*** TEST RESULTS FOR COMMIT 0aa37b654c0f31e446ab47826f0bcbec15d0112f ***

Author: John Baldwin <jhb@FreeBSD.org>
Branch: master
Commit: 0aa37b654c0f31e446ab47826f0bcbec15d0112f

Support the fs_base and gs_base registers on FreeBSD/amd64 native processes.

Use ptrace operations to fetch and store the fs_base and gs_base registers
for FreeBSD/amd64 processes.  Note that FreeBSD does not currently store the
value of these registers in core dumps, so these registers are only
available when inspecting a running process.

gdb/ChangeLog:

	* amd64-bsd-nat.c (amd64bsd_fetch_inferior_registers): Use
	PT_GETFSBASE and PT_GETGSBASE.
	(amd64bsd_store_inferior_registers): Use PT_SETFSBASE and
	PT_SETGSBASE.


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