[PATCH v1] [powerpc] Remove 512 bytes region limit if using 2nd DAWR.

[Ulrich Weigand]

On Sun, Nov 08, 2020 at 11:12:04PM -0300, Rogerio Alves wrote:
> Power 10 introduces the 2nd DAWR (second watchpoint) and also removed
> a restriction that limit the watch region to 512 bytes.
> 
> 2020-11-08  Rogerio A. Cardoso  <rcardoso@linux.ibm.com>
> 
> gdb/
> 
> * ppc-linux-nat.c: (PPC_DEBUG_FEATURE_DATA_BP_ARCH_31): New define.
> (region_ok_for_hw_watchpoint): Check if 2nd DAWR is avaliable before set
> region.

This doesn't look correct, the patch not only removes the alignment
requirement but actually removes support for 512 bytes ranges itself!

I think for P10 we need to continue to allow watched ranges up to
512 bytes in size, but they only need to be 8 byte aligned now and
may cross a 512-byte boundary.

Bye,
Ulrich

-- 
  Dr. Ulrich Weigand
  GNU/Linux compilers and toolchain
  Ulrich.Weigand@de.ibm.com