[patch] Add semihosting documentation for nios2 and m68k

[Sandra Loosemore]

On 3/12/19 5:15 PM, Jeff Johnston wrote:
> Hi Sandra,
> 
> I didn't see any docs for the HOSTED fields in the comments of the 
> libgloss code.  Can you confirm that you didn't grab documentation from 
> elsewhere that has copyright/license issues?  If the source of the docs 
> was covered by the current code licenses for m68k and nios2 they 
> can/should probably be used in the .txt files since the licenses allow 
> for copying of documentation as long as the license is present.

Well, I read the libgloss code too, not just the comments.  Also 
double-checked against the QEMU implementations, the GDB manual, and 
some old internal mailing list discussion.  All of the nios2 and m68k 
semihosting code (both libgloss and QEMU) was originally written by me 
and other CodeSourcery folks, so I think we can license it under any 
terms we want.

Do these documentation files need copyright notices, too?  :-S  That 
didn't occur to me when I wrote them up.

-Sandra