[PATCH 1/3] Refactor default_breakpoint_kind_from_pc to be used by all targets in GDBServer.

[Antoine Tremblay <antoine.tremblay@ericsson.com>]

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.
---
 gdb/gdbserver/linux-low.c | 13 -------------
 gdb/gdbserver/mem-break.c |  2 +-
 gdb/gdbserver/target.c    | 16 ++++++++++++++++
 gdb/gdbserver/target.h    |  7 +++++++
 4 files changed, 24 insertions(+), 14 deletions(-)

diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c
index ac8fae3..0c552b8 100644
--- a/gdb/gdbserver/linux-low.c
+++ b/gdb/gdbserver/linux-low.c
@@ -6937,19 +6937,6 @@ current_lwp_ptid (void)
   return ptid_of (current_thread);
 }
 
-/* Return the default breakpoint kind as the size of the breakpoint.  */
-
-static int
-default_breakpoint_kind_from_pc (CORE_ADDR *pcptr)
-{
-  int size = 0;
-
-  gdb_assert (the_low_target.sw_breakpoint_from_kind != NULL);
-
-  (*the_low_target.sw_breakpoint_from_kind) (0, &size);
-  return size;
-}
-
 /* Implementation of the target_ops method "breakpoint_kind_from_pc".  */
 
 static int
diff --git a/gdb/gdbserver/mem-break.c b/gdb/gdbserver/mem-break.c
index a676ea2..656402a 100644
--- a/gdb/gdbserver/mem-break.c
+++ b/gdb/gdbserver/mem-break.c
@@ -784,7 +784,7 @@ set_breakpoint_at (CORE_ADDR where, int (*handler) (CORE_ADDR))
 {
   int err_ignored;
   CORE_ADDR placed_address = where;
-  int breakpoint_kind = the_target->breakpoint_kind_from_pc (&placed_address);
+  int breakpoint_kind = target_breakpoint_kind_from_pc (&placed_address);
 
   return set_breakpoint (other_breakpoint, raw_bkpt_type_sw,
 			 placed_address, breakpoint_kind, handler,
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;
+}
diff --git a/gdb/gdbserver/target.h b/gdb/gdbserver/target.h
index e4c0639..a14c6ff 100644
--- a/gdb/gdbserver/target.h
+++ b/gdb/gdbserver/target.h
@@ -633,6 +633,11 @@ int kill_inferior (int);
   (the_target->stopped_by_hw_breakpoint ? \
    (*the_target->stopped_by_hw_breakpoint) () : 0)
 
+#define target_breakpoint_kind_from_pc(pcptr) \
+  (the_target->breakpoint_kind_from_pc \
+   ? (*the_target->breakpoint_kind_from_pc) (pcptr) \
+   : default_breakpoint_kind_from_pc (pcptr))
+
 /* Start non-stop mode, returns 0 on success, -1 on failure.   */
 
 int start_non_stop (int nonstop);
@@ -667,4 +672,6 @@ const char *target_pid_to_str (ptid_t);
 
 int target_can_do_hardware_single_step (void);
 
+int default_breakpoint_kind_from_pc (CORE_ADDR *pcptr);
+
 #endif /* TARGET_H */
-- 
1.9.1