Refactor default_breakpoint_kind_from_pc to be used by all targets in GDBServer.

This patch moves default_breakpoint_kind_from_pc to target.c and creates a macro
so that all targets can easily use it.

This allows the breakpoint_kind_from_pc operation to be left unimplemented in
targets that do not need it.

This is preparation to fix the win32/nto/spu build that was broken by this
patch: https://sourceware.org/ml/gdb-patches/2015-10/msg00369.html

No regression on Ubuntu 14.04 x86-64 with gdbserver-{native-extended}

gdb/gdbserver/ChangeLog:

	* linux-low.c (default_breakpoint_kind_from_pc): Move to target.c.
	* mem-break.c (set_breakpoint_at): Use target_breakpoint_kind_from_pc.
	* target.c (default_breakpoint_kind_from_pc): Moved from linux-low.c
	* target.h (target_breakpoint_kind_from_pc): New macro.

1 files changed, 16 insertions, 0 deletions

diff --git a/gdb/gdbserver/target.c b/gdb/gdbserver/target.c
index 301f90e..80512d86 100644
--- a/gdb/gdbserver/target.c
+++ b/gdb/gdbserver/target.c
@@ -224,3 +224,19 @@ target_can_do_hardware_single_step (void)
 {
   return 1;
 }
+
+/* Default implementation for breakpoint_kind_for_pc.
+
+   The default behavior for targets that don't implement breakpoint_kind_for_pc
+   is to use the size of a breakpoint as the kind.  */
+
+int
+default_breakpoint_kind_from_pc (CORE_ADDR *pcptr)
+{
+  int size = 0;
+
+  gdb_assert (the_target->sw_breakpoint_from_kind != NULL);
+
+  (*the_target->sw_breakpoint_from_kind) (0, &size);
+  return size;
+}