This adds .debug=1 attribute for GDB's phys mem access mode, adds
memory transaction error handling for it so it reports cannot access
memory instead of silent success, and silences warning logs for
invalid memory access coming from the debugger.

Changes since v1:
- Move phys_memory_rw_debug() into gdbstub/system.c and update patch
  changelog to match.

Since v2:
- Change to use Philippe's suggestion for log condition.
- Fixed flipped test noticed by Richard (sorry, forgot to actually
  test after rebasing).

Thanks,
Nick

Nicholas Piggin (2):
  gdbstub: Improve physical memory access handling
  memory: suppress INVALID_MEM logs caused by debug access

 gdbstub/system.c | 27 +++++++++++++++++++++------
 system/memory.c  | 10 +++++++---
 2 files changed, 28 insertions(+), 9 deletions(-)

-- 
2.47.1