[PATCH] libgloss support for nios2 QEMU

[Sandra Loosemore]

This patch adds semihosting support for Nios II plus startup code and a 
linker script for bare-board emulation with QEMU.  The QEMU side of 
things requires this patch set

http://lists.nongnu.org/archive/html/qemu-devel/2018-05/msg04571.html

The semihosting code is pretty much a direct copy of the m68k 
implementation, which was contributed by CodeSourcery years ago.  We've 
been using this protocol in our toolchain distributions for Nios II for 
some years now (plus other targets we've been asked to produce 
toolchains for that don't already have some other semihosting protocol 
supported by other tools).

-Sandra
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