[27/58] gdbserver: turn target op 'qxfer_osdata' into a method

diff --git a/gdbserver/linux-low.c b/gdbserver/linux-low.c
index d8209527f0e..595b4282ce2 100644
--- a/gdbserver/linux-low.c
+++ b/gdbserver/linux-low.c
@@ -6134,10 +6134,17 @@  linux_process_target::get_tls_address (thread_info *thread,
 #endif
 }
 
-static int
-linux_qxfer_osdata (const char *annex,
-		    unsigned char *readbuf, unsigned const char *writebuf,
-		    CORE_ADDR offset, int len)
+bool
+linux_process_target::supports_qxfer_osdata ()
+{
+  return true;
+}
+
+int
+linux_process_target::qxfer_osdata (const char *annex,
+				    unsigned char *readbuf,
+				    unsigned const char *writebuf,
+				    CORE_ADDR offset, int len)
 {
   return linux_common_xfer_osdata (annex, readbuf, offset, len);
 }
@@ -7403,7 +7410,6 @@  linux_get_hwcap2 (int wordsize)
 static linux_process_target the_linux_target;
 
 static process_stratum_target linux_target_ops = {
-  linux_qxfer_osdata,
   linux_xfer_siginfo,
   linux_supports_non_stop,
   linux_async,
diff --git a/gdbserver/linux-low.h b/gdbserver/linux-low.h
index be6310da723..5d1164ee944 100644
--- a/gdbserver/linux-low.h
+++ b/gdbserver/linux-low.h
@@ -348,6 +348,12 @@  public:
 
   int get_tls_address (thread_info *thread, CORE_ADDR offset,
 		       CORE_ADDR load_module, CORE_ADDR *address) override;
+
+  bool supports_qxfer_osdata () override;
+
+  int qxfer_osdata (const char *annex, unsigned char *readbuf,
+		    unsigned const char *writebuf,
+		    CORE_ADDR offset, int len) override;
 };
 
 #define get_thread_lwp(thr) ((struct lwp_info *) (thread_target_data (thr)))
diff --git a/gdbserver/lynx-low.c b/gdbserver/lynx-low.c
index 493c48ef355..f9a6b6891dc 100644
--- a/gdbserver/lynx-low.c
+++ b/gdbserver/lynx-low.c
@@ -735,7 +735,6 @@  static lynx_process_target the_lynx_target;
 /* The LynxOS target_ops vector.  */
 
 static process_stratum_target lynx_target_ops = {
-  NULL,  /* qxfer_osdata */
   NULL,  /* qxfer_siginfo */
   NULL,  /* supports_non_stop */
   NULL,  /* async */
diff --git a/gdbserver/nto-low.c b/gdbserver/nto-low.c
index e5f7af2b66e..002b655d407 100644
--- a/gdbserver/nto-low.c
+++ b/gdbserver/nto-low.c
@@ -956,7 +956,6 @@  nto_sw_breakpoint_from_kind (int kind, int *size)
 static nto_process_target the_nto_target;
 
 static process_stratum_target nto_target_ops = {
-  NULL, /* nto_qxfer_osdata */
   NULL, /* xfer_siginfo */
   nto_supports_non_stop,
   NULL, /* async */
diff --git a/gdbserver/server.c b/gdbserver/server.c
index 01d41af0f89..59eb1c0c3d7 100644
--- a/gdbserver/server.c
+++ b/gdbserver/server.c
@@ -1587,10 +1587,10 @@  handle_qxfer_osdata (const char *annex,
 		     gdb_byte *readbuf, const gdb_byte *writebuf,
 		     ULONGEST offset, LONGEST len)
 {
-  if (the_target->qxfer_osdata == NULL || writebuf != NULL)
+  if (!the_target->pt->supports_qxfer_osdata () || writebuf != NULL)
     return -2;
 
-  return (*the_target->qxfer_osdata) (annex, readbuf, NULL, offset, len);
+  return the_target->pt->qxfer_osdata (annex, readbuf, NULL, offset, len);
 }
 
 /* Handle qXfer:siginfo:read and qXfer:siginfo:write.  */
@@ -2392,7 +2392,7 @@  handle_query (char *own_buf, int packet_len, int *new_packet_len_p)
       if (cs.transport_is_reliable)
 	strcat (own_buf, ";QStartNoAckMode+");
 
-      if (the_target->qxfer_osdata != NULL)
+      if (the_target->pt->supports_qxfer_osdata ())
 	strcat (own_buf, ";qXfer:osdata:read+");
 
       if (target_supports_multi_process ())
diff --git a/gdbserver/target.c b/gdbserver/target.c
index e09ee7d0fa4..c6ed544e669 100644
--- a/gdbserver/target.c
+++ b/gdbserver/target.c
@@ -513,3 +513,17 @@  process_target::hostio_last_error (char *buf)
 {
   hostio_last_error_from_errno (buf);
 }
+
+bool
+process_target::supports_qxfer_osdata ()
+{
+  return false;
+}
+
+int
+process_target::qxfer_osdata (const char *annex, unsigned char *readbuf,
+			      unsigned const char *writebuf,
+			      CORE_ADDR offset, int len)
+{
+  gdb_assert_not_reached ("target op qxfer_osdata not supported");
+}
diff --git a/gdbserver/target.h b/gdbserver/target.h
index b3ceaa34ad0..ecc32e16f87 100644
--- a/gdbserver/target.h
+++ b/gdbserver/target.h
@@ -70,11 +70,6 @@  class process_target;
    shared code.  */
 struct process_stratum_target
 {
-  /* Read/Write OS data using qXfer packets.  */
-  int (*qxfer_osdata) (const char *annex, unsigned char *readbuf,
-		       unsigned const char *writebuf, CORE_ADDR offset,
-		       int len);
-
   /* Read/Write extra signal info.  */
   int (*qxfer_siginfo) (const char *annex, unsigned char *readbuf,
 			unsigned const char *writebuf,
@@ -479,6 +474,14 @@  public:
   /* Fill BUF with an hostio error packet representing the last hostio
      error.  */
   virtual void hostio_last_error (char *buf);
+
+  /* Return true if the qxfer_osdata target op is supported.  */
+  virtual bool supports_qxfer_osdata ();
+
+  /* Read/Write OS data using qXfer packets.  */
+  virtual int qxfer_osdata (const char *annex, unsigned char *readbuf,
+			    unsigned const char *writebuf,
+			    CORE_ADDR offset, int len);
 };
 
 extern process_stratum_target *the_target;
diff --git a/gdbserver/win32-low.c b/gdbserver/win32-low.c
index dc75221d361..749460ea1aa 100644
--- a/gdbserver/win32-low.c
+++ b/gdbserver/win32-low.c
@@ -1834,7 +1834,6 @@  win32_sw_breakpoint_from_kind (int kind, int *size)
 static win32_process_target the_win32_target;
 
 static process_stratum_target win32_target_ops = {
-  NULL, /* qxfer_osdata */
   win32_xfer_siginfo,
   NULL, /* supports_non_stop */
   NULL, /* async */