[patch, nios2] Update Linux parts for new syscall ABI

[Chung-Lin Tang]

On 2013/12/3 11:06 AM, Joel Brobecker wrote:
>> 2013-12-01  Chung-Lin Tang  <cltang@codesourcery.com>
>>
>>         gdb/
>>         * nios2-linux-tdep.c (nios2_linux_sigreturn_init): Remove.
>>         (nios2_linux_sigreturn_tramp_frame): Remove.
>>         (nios2_linux_rt_sigreturn_tramp_frame): Update rt_sigreturn syscall
>>         number.
>>         (nios2_linux_syscall_next_pc): Likewise. Remove sigreturn case.
>>         (nios2_linux_init_abi):
>>         Remove registration of nios2_linux_sigreturn_tramp_frame.
> 
> This is OK for me, but I think a change of this kind requires a NEWS
> entry as well, to document on which systems the new GDB will be working.

I have committed/pushed this to master. As for a NEWS entry, we already
have an announcement for nios2*-linux. If you feel it would be more
appropriate, I can append a "(generic syscall ABI)" besides it, to be
more clear on the supported systems.

As for the issue of nios2 port maintainer, Yao already volunteered
earlier, or if someone more familiar with nios2 details is desired, I
can fill in the task.

Thanks,
Chung-Lin