[PATCH, nios2] Updates to Nios II Linux

[Chung-Lin Tang]

The Nios II ports of glibc and Linux kernel are now both upstream. New
system conventions now use a non-executable stack. Attached patch
committed to support new conventions, applied to both trunk and 4.9 branch.

Chung-Lin

2015-01-20  Chung-Lin Tang  <cltang@codesourcery.com>

	gcc/
        * config/nios2/nios2.c (nios2_asm_file_end): Implement
        TARGET_ASM_FILE_END hook for adding .note.GNU-stack section when
        needed.
        (TARGET_ASM_FILE_END): Define.

	libgcc/
        * config/nios2/linux-unwind.h (nios2_fallback_frame_state):
        Update rt_sigframe format and address for current Nios II
        Linux conventions.
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