gdbserver: turn target op 'qxfer_siginfo' into a method

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

	Turn process_stratum_target's qxfer_siginfo 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_qxfer_siginfo'.
	* target.cc (process_target::qxfer_siginfo): Define.
	(process_target::supports_qxfer_siginfo): Define.

	Update the derived classes and callers below.

	* server.cc (handle_qxfer_siginfo): Update.
	(handle_query): Update.
	* linux-low.cc (linux_target_ops): Update.
	(linux_process_target::supports_qxfer_siginfo): Define.
	(linux_xfer_siginfo): Turn into ...
	(linux_process_target::qxfer_siginfo): ... this.
	* 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.

1 files changed, 14 insertions, 0 deletions

diff --git a/gdbserver/target.cc b/gdbserver/target.cc
index c6ed544..94bb45f 100644
--- a/gdbserver/target.cc
+++ b/gdbserver/target.cc
@@ -527,3 +527,17 @@ process_target::qxfer_osdata (const char *annex, unsigned char *readbuf,
 {
   gdb_assert_not_reached ("target op qxfer_osdata not supported");
 }
+
+bool
+process_target::supports_qxfer_siginfo ()
+{
+  return false;
+}
+
+int
+process_target::qxfer_siginfo (const char *annex, unsigned char *readbuf,
+			       unsigned const char *writebuf,
+			       CORE_ADDR offset, int len)
+{
+  gdb_assert_not_reached ("target op qxfer_siginfo not supported");
+}