[PATCH] GDBserver aarch64 support.

[Marcus Shawcroft]

This is a re-spin of the AArch64 GDBserver patch:

http://sourceware.org/ml/gdb-patches/2013-01/msg00535.html

This version of the patch addresses the comments raised here:

http://sourceware.org/ml/gdb-patches/2013-02/msg00010.html


>> +  /* Find the entry that matches the ADDR and CTRL.  */
>> +  for (i = 0; i < num_regs; ++i)
>> +    if (dr_addr_p[i] == addr && dr_ctrl_p[i] == ctrl)
>> +      {
>> +	gdb_assert (dr_ref_count[i] != 0);
>> +	break;
>
> "break" after gdb_assert is dead code.

This one matters, it is required in order to terminate the loop early.

All of the other comments have been addressed.  The ptrace() changes 
have been split out to a separate patch, already posted.  The remaining 
trivial changes to low-linux.c are irrelevant to the AArch64 port, so I 
have removed them.

Cheers
/Marcus


Proposed ChangeLog

2013-02-04  Jim MacArthur  <jim.macarthur@arm.com>
             Marcus Shawcroft  <marcus.shawcroft@arm.com>
             Nigel Stephens  <nigel.stephens@arm.com>
             Yufeng Zhang  <yufeng.zhang@arm.com>

     gdb/

         * configure.tgt (aarch64*-*-linux*): Set build_gdbserver=yes.

     gdb/gdbserver/

	* Makefile.in (clean): Remove aarch64.c and aarch64-without-fpu.c
	(aarch64.c, aarch64-without-fpu.c): New targets.
	* configure.srv (aarch64*-*-linux*): New.
	* linux-aarch64-low.c: New file.
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