gdbserver: turn target op 'get_tls_address' into a method

gdbserver/ChangeLog:
2020-02-20  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>

	Turn process_stratum_target's get_tls_address op into a method of
	process_target.

	* target.h (struct process_stratum_target): Remove the target op.
	(class process_target): Add the target op.  Also add
	'supports_get_tls_address'.
	* target.cc (process_target::get_tls_address): Define.
	(process_target::supports_get_tls_address): Define.

	Update the derived classes and callers below.

	* server.cc (handle_query): Update.
	* linux-low.cc (linux_target_ops): Update.
	(linux_process_target::supports_get_tls_address): Define.
	(linux_process_target::get_tls_address): Define.
	* linux-low.h (class linux_process_target): Update.
	* lynx-low.cc (lynx_target_ops): Update.
	* nto-low.cc (nto_target_ops): Update.
	* win32-low.cc (win32_target_ops): Update.

gdbserver/ChangeLog

@@ -1,3 +1,25 @@
+2020-02-20  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>
+
+	Turn process_stratum_target's get_tls_address op into a method of
+	process_target.
+
+	* target.h (struct process_stratum_target): Remove the target op.
+	(class process_target): Add the target op.  Also add
+	'supports_get_tls_address'.
+	* target.cc (process_target::get_tls_address): Define.
+	(process_target::supports_get_tls_address): Define.
+
+	Update the derived classes and callers below.
+
+	* server.cc (handle_query): Update.
+	* linux-low.cc (linux_target_ops): Update.
+	(linux_process_target::supports_get_tls_address): Define.
+	(linux_process_target::get_tls_address): Define.
+	* linux-low.h (class linux_process_target): Update.
+	* lynx-low.cc (lynx_target_ops): Update.
+	* nto-low.cc (nto_target_ops): Update.
+	* win32-low.cc (win32_target_ops): Update.
+
 2020-02-20  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>
 
 	Turn process_stratum_target's read_offsets op into a method of

gdbserver/linux-low.cc

@@ -6123,6 +6123,29 @@ linux_process_target::read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p)
 #endif
 }
 
+bool
+linux_process_target::supports_get_tls_address ()
+{
+#ifdef USE_THREAD_DB
+  return true;
+#else
+  return false;
+#endif
+}
+
+int
+linux_process_target::get_tls_address (thread_info *thread,
+				       CORE_ADDR offset,
+				       CORE_ADDR load_module,
+				       CORE_ADDR *address)
+{
+#ifdef USE_THREAD_DB
+  return thread_db_get_tls_address (thread, offset, load_module, address);
+#else
+  return -1;
+#endif
+}
+
 static int
 linux_qxfer_osdata (const char *annex,
 		    unsigned char *readbuf, unsigned const char *writebuf,
@@ -7392,11 +7415,6 @@ linux_get_hwcap2 (int wordsize)
 static linux_process_target the_linux_target;
 
 static process_stratum_target linux_target_ops = {
-#ifdef USE_THREAD_DB
-  thread_db_get_tls_address,
-#else
-  NULL,
-#endif
   hostio_last_error_from_errno,
   linux_qxfer_osdata,
   linux_xfer_siginfo,

gdbserver/linux-low.h

@@ -340,6 +340,11 @@ public:
   bool supports_read_offsets () override;
 
   int read_offsets (CORE_ADDR *text, CORE_ADDR *data) override;
+
+  bool supports_get_tls_address () override;
+
+  int get_tls_address (thread_info *thread, CORE_ADDR offset,
+		       CORE_ADDR load_module, CORE_ADDR *address) override;
 };
 
 #define get_thread_lwp(thr) ((struct lwp_info *) (thread_target_data (thr)))

gdbserver/lynx-low.cc

@@ -735,7 +735,6 @@ static lynx_process_target the_lynx_target;
 /* The LynxOS target_ops vector.  */
 
 static process_stratum_target lynx_target_ops = {
-  NULL,  /* get_tls_address */
   NULL,  /* hostio_last_error */
   NULL,  /* qxfer_osdata */
   NULL,  /* qxfer_siginfo */

gdbserver/nto-low.cc

@@ -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, /* thread_db_set_tls_address */
   hostio_last_error_from_errno,
   NULL, /* nto_qxfer_osdata */
   NULL, /* xfer_siginfo */

gdbserver/server.cc

@@ -2467,7 +2467,7 @@ handle_query (char *own_buf, int packet_len, int *new_packet_len_p)
     }
 
   /* Thread-local storage support.  */
-  if (the_target->get_tls_address != NULL
+  if (the_target->pt->supports_get_tls_address ()
       && startswith (own_buf, "qGetTLSAddr:"))
     {
       char *p = own_buf + 12;
@@ -2513,7 +2513,7 @@ handle_query (char *own_buf, int packet_len, int *new_packet_len_p)
 	  if (thread == NULL)
 	    err = 2;
 	  else
-	    err = the_target->get_tls_address (thread, parts[0], parts[1],
+	    err = the_target->pt->get_tls_address (thread, parts[0], parts[1],
 						   &address);
 	}
 

gdbserver/target.cc

@@ -493,3 +493,16 @@ process_target::read_offsets (CORE_ADDR *text, CORE_ADDR *data)
 {
   gdb_assert_not_reached ("target op read_offsets not supported");
 }
+
+bool
+process_target::supports_get_tls_address ()
+{
+  return false;
+}
+
+int
+process_target::get_tls_address (thread_info *thread, CORE_ADDR offset,
+				 CORE_ADDR load_module, CORE_ADDR *address)
+{
+  gdb_assert_not_reached ("target op get_tls_address not supported");
+}

gdbserver/target.h

@@ -70,15 +70,6 @@ class process_target;
    shared code.  */
 struct process_stratum_target
 {
-  /* Fetch the address associated with a specific thread local storage
-     area, determined by the specified THREAD, OFFSET, and LOAD_MODULE.
-     Stores it in *ADDRESS and returns zero on success; otherwise returns
-     an error code.  A return value of -1 means this system does not
-     support the operation.  */
-
-  int (*get_tls_address) (struct thread_info *thread, CORE_ADDR offset,
-			  CORE_ADDR load_module, CORE_ADDR *address);
-
   /* Fill BUF with an hostio error packet representing the last hostio
      error.  */
   void (*hostio_last_error) (char *buf);
@@ -477,6 +468,17 @@ public:
      needed for uclinux where the executable is relocated during load
      time.  */
   virtual int read_offsets (CORE_ADDR *text, CORE_ADDR *data);
+
+  /* Return true if the get_tls_address target op is supported.  */
+  virtual bool supports_get_tls_address ();
+
+  /* Fetch the address associated with a specific thread local storage
+     area, determined by the specified THREAD, OFFSET, and LOAD_MODULE.
+     Stores it in *ADDRESS and returns zero on success; otherwise returns
+     an error code.  A return value of -1 means this system does not
+     support the operation.  */
+  virtual int get_tls_address (thread_info *thread, CORE_ADDR offset,
+			       CORE_ADDR load_module, CORE_ADDR *address);
 };
 
 extern process_stratum_target *the_target;

gdbserver/win32-low.cc

@@ -1844,7 +1844,6 @@ win32_sw_breakpoint_from_kind (int kind, int *size)
 static win32_process_target the_win32_target;
 
 static process_stratum_target win32_target_ops = {
-  NULL, /* get_tls_address */
 #ifdef _WIN32_WCE
   wince_hostio_last_error,
 #else