nat: Split out platform-independent aarch64 debug register support.

Move non-Linux-specific support for hardware break/watchpoints from
nat/aarch64-linux-hw-point.c to nat/aarch64-hw-point.c.  Changes
beyond a simple split of the code are:

- aarch64_linux_region_ok_for_watchpoint and
  aarch64_linux_any_set_debug_regs_state renamed to drop linux_ as
  they are not platform specific.

- Platforms must implement the aarch64_notify_debug_reg_change
  function which is invoked from the platform-independent code when a
  debug register changes for a given debug register state.  This does
  not use the indirection of a 'low' structure as is done for x86.

- The handling for kernel_supports_any_contiguous_range is not
  pristine.  For non-Linux it is simply defined to true.  Some uses of
  this could perhaps be implemented as new 'low' routines for the
  various places that check it instead?

- Pass down ptid into aarch64_handle_breakpoint and
  aarch64_handle_watchpoint rather than using current_lwp_ptid which
  is only defined on Linux.  In addition, pass the ptid on to
  aarch64_notify_debug_reg_change instead of the unused state
  argument.

2 files changed, 9 insertions, 5 deletions

diff --git a/gdbserver/configure.srv b/gdbserver/configure.srv
index 6e09b0e..d370536 100644
--- a/gdbserver/configure.srv
+++ b/gdbserver/configure.srv
@@ -39,6 +39,7 @@ fi
 
 case "${gdbserver_host}" in
   aarch64*-*-linux*)	srv_tgtobj="linux-aarch64-low.o"
+			srv_tgtobj="$srv_tgtobj nat/aarch64-hw-point.o"
 			srv_tgtobj="$srv_tgtobj nat/aarch64-linux-hw-point.o"
 			srv_tgtobj="$srv_tgtobj linux-aarch32-low.o"
 			srv_tgtobj="$srv_tgtobj linux-aarch32-tdesc.o"
diff --git a/gdbserver/linux-aarch64-low.cc b/gdbserver/linux-aarch64-low.cc
index aef69b3..0091f99 100644
--- a/gdbserver/linux-aarch64-low.cc
+++ b/gdbserver/linux-aarch64-low.cc
@@ -413,9 +413,10 @@ aarch64_target::low_insert_point (raw_bkpt_type type, CORE_ADDR addr,
 
   if (targ_type != hw_execute)
     {
-      if (aarch64_linux_region_ok_for_watchpoint (addr, len))
+      if (aarch64_region_ok_for_watchpoint (addr, len))
 	ret = aarch64_handle_watchpoint (targ_type, addr, len,
-					 1 /* is_insert */, state);
+					 1 /* is_insert */,
+					 current_lwp_ptid (), state);
       else
 	ret = -1;
     }
@@ -429,7 +430,8 @@ aarch64_target::low_insert_point (raw_bkpt_type type, CORE_ADDR addr,
 	  len = 2;
 	}
       ret = aarch64_handle_breakpoint (targ_type, addr, len,
-				       1 /* is_insert */, state);
+				       1 /* is_insert */, current_lwp_ptid (),
+				       state);
     }
 
   if (show_debug_regs)
@@ -464,7 +466,7 @@ aarch64_target::low_remove_point (raw_bkpt_type type, CORE_ADDR addr,
   if (targ_type != hw_execute)
     ret =
       aarch64_handle_watchpoint (targ_type, addr, len, 0 /* is_insert */,
-				 state);
+				 current_lwp_ptid (), state);
   else
     {
       if (len == 3)
@@ -475,7 +477,8 @@ aarch64_target::low_remove_point (raw_bkpt_type type, CORE_ADDR addr,
 	  len = 2;
 	}
       ret = aarch64_handle_breakpoint (targ_type, addr, len,
-				       0 /* is_insert */,  state);
+				       0 /* is_insert */,  current_lwp_ptid (),
+				       state);
     }
 
   if (show_debug_regs)