diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index 76ca0da..b33defe 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -851,7 +851,7 @@ SFILES = ada-exp.y ada-lang.c ada-typeprint.c ada-valprint.c ada-tasks.c \
 	common/ptid.c common/buffer.c gdb-dlfcn.c common/agent.c \
 	common/format.c common/filestuff.c btrace.c record-btrace.c ctf.c \
 	target/waitstatus.c common/print-utils.c common/rsp-low.c \
-	common/errors.c
+	common/errors.c common/common-debug.c
 
 LINTFILES = $(SFILES) $(YYFILES) $(CONFIG_SRCS) init.c
 
@@ -936,7 +936,8 @@ gdb_bfd.h sparc-ravenscar-thread.h ppc-ravenscar-thread.h nat/linux-btrace.h \
 ctf.h nat/i386-cpuid.h nat/i386-gcc-cpuid.h target/resume.h \
 target/wait.h target/waitstatus.h nat/linux-nat.h nat/linux-waitpid.h \
 common/print-utils.h common/rsp-low.h nat/i386-dregs.h x86-linux-nat.h \
-i386-linux-nat.h common/common-defs.h common/errors.h common/common-types.h
+i386-linux-nat.h common/common-defs.h common/errors.h common/common-types.h \
+common/common-debug.h
 
 # Header files that already have srcdir in them, or which are in objdir.
 
@@ -1035,7 +1036,7 @@ COMMON_OBS = $(DEPFILES) $(CONFIG_OBS) $(YYOBJ) \
 	gdb_vecs.o jit.o progspace.o skip.o probe.o \
 	common-utils.o buffer.o ptid.o gdb-dlfcn.o common-agent.o \
 	format.o registry.o btrace.o record-btrace.o waitstatus.o \
-	print-utils.o rsp-low.o errors.o
+	print-utils.o rsp-low.o errors.o common-debug.o debug.o
 
 TSOBS = inflow.o
 
@@ -2149,6 +2150,10 @@ errors.o: ${srcdir}/common/errors.c
 	$(COMPILE) $(srcdir)/common/errors.c
 	$(POSTCOMPILE)
 
+common-debug.o: ${srcdir}/common/common-debug.c
+	$(COMPILE) $(srcdir)/common/common-debug.c
+	$(POSTCOMPILE)
+
 #
 # gdb/target/ dependencies
 #
diff --git a/gdb/aarch64-linux-nat.c b/gdb/aarch64-linux-nat.c
index 4ae789b..c5073af 100644
--- a/gdb/aarch64-linux-nat.c
+++ b/gdb/aarch64-linux-nat.c
@@ -119,10 +119,6 @@ get_thread_id (ptid_t ptid)
 static int aarch64_num_bp_regs;
 static int aarch64_num_wp_regs;
 
-/* Debugging of hardware breakpoint/watchpoint support.  */
-
-static int debug_hw_points;
-
 /* Each bit of a variable of this type is used to indicate whether a
    hardware breakpoint or watchpoint setting has been changed since
    the last update.
diff --git a/gdb/common/agent.c b/gdb/common/agent.c
index 3f868ba..2963917 100644
--- a/gdb/common/agent.c
+++ b/gdb/common/agent.c
@@ -31,15 +31,21 @@
 
 int debug_agent = 0;
 
-#ifdef GDBSERVER
-#define DEBUG_AGENT(fmt, args...)	\
-  if (debug_agent)			\
-    fprintf (stderr, fmt, ##args);
-#else
-#define DEBUG_AGENT(fmt, args...)	\
-  if (debug_agent)			\
-    fprintf_unfiltered (gdb_stdlog, fmt, ##args);
-#endif
+/* A stdarg wrapper for debug_vprintf.  */
+
+static void ATTRIBUTE_PRINTF (1, 2)
+debug_agent_printf (const char *fmt, ...)
+{
+  va_list ap;
+
+  if (!debug_agent)
+    return;
+  va_start (ap, fmt);
+  debug_vprintf (fmt, ap);
+  va_end (ap);
+}
+
+#define DEBUG_AGENT debug_agent_printf
 
 /* Global flag to determine using agent or not.  */
 int use_agent = 0;
diff --git a/gdb/common/common-debug.c b/gdb/common/common-debug.c
new file mode 100644
index 0000000..6242c0d
--- /dev/null
+++ b/gdb/common/common-debug.c
@@ -0,0 +1,41 @@
+/* Debug printing functions.
+
+   Copyright (C) 2014 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifdef GDBSERVER
+#include "server.h"
+#else
+#include "defs.h"
+#endif
+#include "common-debug.h"
+
+/* See common/common-debug.h.  */
+
+int debug_hw_points;
+
+/* See common/common-debug.h.  */
+
+void
+debug_printf (const char *fmt, ...)
+{
+  va_list ap;
+
+  va_start (ap, fmt);
+  debug_vprintf (fmt, ap);
+  va_end (ap);
+}
diff --git a/gdb/common/common-debug.h b/gdb/common/common-debug.h
new file mode 100644
index 0000000..d63f800
--- /dev/null
+++ b/gdb/common/common-debug.h
@@ -0,0 +1,41 @@
+/* Declarations for debug printing functions.
+
+   Copyright (C) 2014 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef COMMON_DEBUG_H
+#define COMMON_DEBUG_H
+
+/* Set to nonzero to enable debugging of hardware breakpoint/
+   watchpoint support code.  */
+
+extern int debug_hw_points;
+
+/* Print a formatted message to the appropriate channel for
+   debugging output for the client.  */
+
+extern void debug_printf (const char *format, ...)
+     ATTRIBUTE_PRINTF (1, 2);
+
+/* Print a formatted message to the appropriate channel for
+   debugging output for the client.  This function must be
+   provided by the client.  */
+
+extern void debug_vprintf (const char *format, va_list ap)
+     ATTRIBUTE_PRINTF (1, 0);
+
+#endif /* COMMON_DEBUG_H */
diff --git a/gdb/common/common-defs.h b/gdb/common/common-defs.h
index 66c0d21..2d3444b 100644
--- a/gdb/common/common-defs.h
+++ b/gdb/common/common-defs.h
@@ -44,5 +44,6 @@
 #include "errors.h"
 #include "common-types.h"
 #include "print-utils.h"
+#include "common-debug.h"
 
 #endif /* COMMON_DEFS_H */
diff --git a/gdb/debug.c b/gdb/debug.c
new file mode 100644
index 0000000..95cf617
--- /dev/null
+++ b/gdb/debug.c
@@ -0,0 +1,28 @@
+/* Debug printing functions.
+
+   Copyright (C) 2014 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "defs.h"
+
+/* See common/common-debug.h.  */
+
+void
+debug_vprintf (const char *fmt, va_list ap)
+{
+  vfprintf_unfiltered (gdb_stdlog, fmt, ap);
+}
diff --git a/gdb/gdbserver/Makefile.in b/gdb/gdbserver/Makefile.in
index 1faa00c..18486c6 100644
--- a/gdb/gdbserver/Makefile.in
+++ b/gdb/gdbserver/Makefile.in
@@ -169,7 +169,8 @@ SFILES=	$(srcdir)/gdbreplay.c $(srcdir)/inferiors.c $(srcdir)/dll.c \
 	$(srcdir)/common/buffer.c $(srcdir)/nat/linux-btrace.c \
 	$(srcdir)/common/filestuff.c $(srcdir)/target/waitstatus.c \
 	$(srcdir)/nat/mips-linux-watch.c $(srcdir)/common/print-utils.c \
-	$(srcdir)/common/rsp-low.c $(srcdir)/common/errors.c
+	$(srcdir)/common/rsp-low.c $(srcdir)/common/errors.c \
+	$(srcdir)/common/common-debug.c
 
 DEPFILES = @GDBSERVER_DEPFILES@
 
@@ -182,8 +183,8 @@ OBS = agent.o ax.o inferiors.o regcache.o remote-utils.o server.o signals.o \
       target.o waitstatus.o utils.o debug.o version.o vec.o gdb_vecs.o \
       mem-break.o hostio.o event-loop.o tracepoint.o xml-utils.o \
       common-utils.o ptid.o buffer.o format.o filestuff.o dll.o notif.o \
-      tdesc.o print-utils.o rsp-low.o errors.o $(XML_BUILTIN) $(DEPFILES) \
-      $(LIBOBJS)
+      tdesc.o print-utils.o rsp-low.o errors.o common-debug.o \
+      $(XML_BUILTIN) $(DEPFILES) $(LIBOBJS)
 GDBREPLAY_OBS = gdbreplay.o version.o
 GDBSERVER_LIBS = @GDBSERVER_LIBS@
 XM_CLIBS = @LIBS@
@@ -540,6 +541,9 @@ agent.o: ../common/agent.c
 errors.o: ../common/errors.c
 	$(COMPILE) $<
 	$(POSTCOMPILE)
+common-debug.o: ../common/common-debug.c
+	$(COMPILE) $<
+	$(POSTCOMPILE)
 waitstatus.o: ../target/waitstatus.c
 	$(COMPILE) $<
 	$(POSTCOMPILE)
diff --git a/gdb/gdbserver/debug.c b/gdb/gdbserver/debug.c
index c50af76..339e33c 100644
--- a/gdb/gdbserver/debug.c
+++ b/gdb/gdbserver/debug.c
@@ -33,9 +33,8 @@ int debug_timestamp;
    previous call ended with "\n".  */
 
 void
-debug_printf (const char *msg, ...)
+debug_vprintf (const char *format, va_list ap)
 {
-  va_list args;
 #if !defined (IN_PROCESS_AGENT)
   /* N.B. Not thread safe, and can't be used, as is, with IPA.  */
   static int new_line = 1;
@@ -53,13 +52,11 @@ debug_printf (const char *msg, ...)
     }
 #endif
 
-  va_start (args, msg);
-  vfprintf (stderr, msg, args);
-  va_end (args);
+  vfprintf (stderr, format, ap);
 
 #if !defined (IN_PROCESS_AGENT)
-  if (*msg)
-    new_line = msg[strlen (msg) - 1] == '\n';
+  if (*format)
+    new_line = format[strlen (format) - 1] == '\n';
 #endif
 }
 
diff --git a/gdb/gdbserver/debug.h b/gdb/gdbserver/debug.h
index 0f056ca..42a3f21 100644
--- a/gdb/gdbserver/debug.h
+++ b/gdb/gdbserver/debug.h
@@ -29,7 +29,6 @@
 extern int debug_threads;
 extern int debug_timestamp;
 
-void debug_printf (const char *msg, ...) ATTRIBUTE_PRINTF (1, 2);
 void debug_flush (void);
 void do_debug_enter (const char *function_name);
 void do_debug_exit (const char *function_name);
diff --git a/gdb/gdbserver/linux-aarch64-low.c b/gdb/gdbserver/linux-aarch64-low.c
index 6066e15..32f153d 100644
--- a/gdb/gdbserver/linux-aarch64-low.c
+++ b/gdb/gdbserver/linux-aarch64-low.c
@@ -267,9 +267,6 @@ aarch64_store_fpregset (struct regcache *regcache, const void *buf)
     supply_register (regcache, AARCH64_V0_REGNO + i, &regset->vregs[i]);
 }
 
-/* Debugging of hardware breakpoint/watchpoint support.  */
-extern int debug_hw_points;
-
 /* Enable miscellaneous debugging output.  The name is historical - it
    was originally used to debug LinuxThreads support.  */
 extern int debug_threads;
diff --git a/gdb/gdbserver/server.c b/gdb/gdbserver/server.c
index cf1dffe..b10524f 100644
--- a/gdb/gdbserver/server.c
+++ b/gdb/gdbserver/server.c
@@ -69,9 +69,6 @@ int disable_randomization = 1;
 
 static char **program_argv, **wrapper_argv;
 
-/* Enable debugging of h/w breakpoint/watchpoint support.  */
-int debug_hw_points;
-
 int pass_signals[GDB_SIGNAL_LAST];
 int program_signals[GDB_SIGNAL_LAST];
 int program_signals_p;
diff --git a/gdb/gdbserver/server.h b/gdb/gdbserver/server.h
index e6b2277..97498a6 100644
--- a/gdb/gdbserver/server.h
+++ b/gdb/gdbserver/server.h
@@ -84,7 +84,6 @@ extern ptid_t cont_thread;
 extern ptid_t general_thread;
 
 extern int server_waiting;
-extern int debug_hw_points;
 extern int pass_signals[];
 extern int program_signals[];
 extern int program_signals_p;
diff --git a/gdb/i386-nat.c b/gdb/i386-nat.c
index 499fffb..e5cbd36 100644
--- a/gdb/i386-nat.c
+++ b/gdb/i386-nat.c
@@ -33,9 +33,6 @@
    The functions below implement debug registers sharing by reference
    counts, and allow to watch regions up to 16 bytes long.  */
 
-/* Whether or not to print the mirrored debug registers.  */
-int debug_hw_points;
-
 /* Low-level function vector.  */
 struct i386_dr_low_type i386_dr_low;
 
diff --git a/gdb/nat/i386-dregs.c b/gdb/nat/i386-dregs.c
index 1fa5c19..1e16cf1 100644
--- a/gdb/nat/i386-dregs.c
+++ b/gdb/nat/i386-dregs.c
@@ -175,15 +175,6 @@
 /* Types of operations supported by i386_handle_nonaligned_watchpoint.  */
 typedef enum { WP_INSERT, WP_REMOVE, WP_COUNT } i386_wp_op_t;
 
-#ifndef GDBSERVER
-/* Whether or not to print the mirrored debug registers.  */
-extern int debug_hw_points;
-
-/* Print debugging messages.  */
-#define debug_printf(fmt, args...) \
-  fprintf_unfiltered (gdb_stdlog, fmt, ##args);
-#endif
-
 /* Print the values of the mirrored debug registers.  */
 
 static void
