[PATCH 24/58] gdbserver: turn target op 'read_offsets' into a method

[Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>]

gdbserver/ChangeLog:
2020-02-10  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>

	Make process_stratum_target's read_offsets op 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_read_offsets'.
	* target.c (process_target::read_offsets): Define.
	(process_target::supports_read_offsets): Define.

	Update the derived structs and callers below.

	* server.c (handle_query): Update.
	* linux-low.c (linux_target_ops): Update.
	(linux_process_target::supports_read_offsets): Define.
	(linux_read_offsets): Turn into ...
	(linux_process_target::read_offsets): ... this.
	* linux-low.h (class linux_process_target): Update.
	* lynx-low.c (lynx_target_ops): Update.
	* nto-low.c (nto_target_ops): Update.
	* win32-low.c (win32_target_ops): Update.
---
 gdbserver/linux-low.c | 17 ++++++++---------
 gdbserver/linux-low.h |  8 ++++++++
 gdbserver/lynx-low.c  |  1 -
 gdbserver/nto-low.c   |  1 -
 gdbserver/server.c    |  4 ++--
 gdbserver/target.c    | 12 ++++++++++++
 gdbserver/target.h    | 14 ++++++++------
 gdbserver/win32-low.c |  1 -
 8 files changed, 38 insertions(+), 20 deletions(-)

diff --git a/gdbserver/linux-low.c b/gdbserver/linux-low.c
index a01ecd0c562..93cd2bf57d4 100644
--- a/gdbserver/linux-low.c
+++ b/gdbserver/linux-low.c
@@ -6068,11 +6068,17 @@ linux_process_target::stopped_data_address ()
    the target has different ways of acquiring this information, like
    loadmaps.  */
 
+bool
+linux_process_target::supports_read_offsets ()
+{
+  return true;
+}
+
 /* Under uClinux, programs are loaded at non-zero offsets, which we need
    to tell gdb about.  */
 
-static int
-linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p)
+int
+linux_process_target::read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p)
 {
   unsigned long text, text_end, data;
   int pid = lwpid_of (current_thread);
@@ -7375,13 +7381,6 @@ linux_get_hwcap2 (int wordsize)
 static linux_process_target the_linux_target;
 
 static process_stratum_target linux_target_ops = {
-#if defined(__UCLIBC__) && defined(HAS_NOMMU)	      \
-    && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
-    && defined(PT_TEXT_END_ADDR)
-  linux_read_offsets,
-#else
-  NULL,
-#endif
 #ifdef USE_THREAD_DB
   thread_db_get_tls_address,
 #else
diff --git a/gdbserver/linux-low.h b/gdbserver/linux-low.h
index 59a1d9321d9..5cf2e62dffb 100644
--- a/gdbserver/linux-low.h
+++ b/gdbserver/linux-low.h
@@ -335,6 +335,14 @@ public:
   bool stopped_by_watchpoint () override;
 
   CORE_ADDR stopped_data_address () override;
+
+#if defined(__UCLIBC__) && defined(HAS_NOMMU)	      \
+    && defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) \
+    && defined(PT_TEXT_END_ADDR)
+  bool supports_read_offsets () override;
+
+  int read_offsets (CORE_ADDR *text, CORE_ADDR *data) override;
+#endif
 };
 
 #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 0d4934fb313..2a3eda61b5f 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,  /* read_offsets */
   NULL,  /* get_tls_address */
   NULL,  /* hostio_last_error */
   NULL,  /* qxfer_osdata */
diff --git a/gdbserver/nto-low.c b/gdbserver/nto-low.c
index fc7a6032fd6..5d4540cff7e 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_read_offsets */
   NULL, /* thread_db_set_tls_address */
   hostio_last_error_from_errno,
   NULL, /* nto_qxfer_osdata */
diff --git a/gdbserver/server.c b/gdbserver/server.c
index f13061c871b..b4fd9c6a5e5 100644
--- a/gdbserver/server.c
+++ b/gdbserver/server.c
@@ -2234,13 +2234,13 @@ handle_query (char *own_buf, int packet_len, int *new_packet_len_p)
 	}
     }
 
-  if (the_target->read_offsets != NULL
+  if (the_target->pt->supports_read_offsets ()
       && strcmp ("qOffsets", own_buf) == 0)
     {
       CORE_ADDR text, data;
 
       require_running_or_return (own_buf);
-      if (the_target->read_offsets (&text, &data))
+      if (the_target->pt->read_offsets (&text, &data))
 	sprintf (own_buf, "Text=%lX;Data=%lX;Bss=%lX",
 		 (long)text, (long)data, (long)data);
       else
diff --git a/gdbserver/target.c b/gdbserver/target.c
index 00f5f794b85..501a8d675db 100644
--- a/gdbserver/target.c
+++ b/gdbserver/target.c
@@ -481,3 +481,15 @@ process_target::stopped_data_address ()
 {
   return 0;
 }
+
+bool
+process_target::supports_read_offsets ()
+{
+  return false;
+}
+
+int
+process_target::read_offsets (CORE_ADDR *text, CORE_ADDR *data)
+{
+  gdb_assert_not_reached ("target op read_offsets not supported");
+}
diff --git a/gdbserver/target.h b/gdbserver/target.h
index f9c749fdfcb..8919d43317e 100644
--- a/gdbserver/target.h
+++ b/gdbserver/target.h
@@ -70,12 +70,6 @@ class process_target;
    shared code.  */
 struct process_stratum_target
 {
-  /* Reports the text, data offsets of the executable.  This is
-     needed for uclinux where the executable is relocated during load
-     time.  */
-
-  int (*read_offsets) (CORE_ADDR *text, CORE_ADDR *data);
-
   /* 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
@@ -475,6 +469,14 @@ public:
   /* Returns the address associated with the watchpoint that hit, if any;
      returns 0 otherwise.  */
   virtual CORE_ADDR stopped_data_address ();
+
+  /* Return true if the read_offsets target op is supported.  */
+  virtual bool supports_read_offsets ();
+
+  /* Reports the text, data offsets of the executable.  This is
+     needed for uclinux where the executable is relocated during load
+     time.  */
+  virtual int read_offsets (CORE_ADDR *text, CORE_ADDR *data);
 };
 
 extern process_stratum_target *the_target;
diff --git a/gdbserver/win32-low.c b/gdbserver/win32-low.c
index 970c532c149..48b70a5e334 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, /* read_offsets */
   NULL, /* get_tls_address */
 #ifdef _WIN32_WCE
   wince_hostio_last_error,
-- 
2.17.1