gdbserver/linux-low: turn 'get_syscall_trapinfo' into a method

gdbserver/ChangeLog:
2020-04-02  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>

	Turn the 'get_syscall_trapinfo' linux target op into a method
	of process_stratum_target.

	* linux-low.h (struct linux_target_ops): Remove the op.
	(class linux_process_target) <get_syscall_trapinfo>
	<gdb_catch_this_syscall>
	<low_supports_catch_syscall>
	<low_get_syscall_trapinfo>: Declare.
	* linux-low.cc (get_syscall_trapinfo): Turn into...
	(linux_process_target::get_syscall_trapinfo): ...this.
	(linux_process_target::low_get_syscall_trapinfo): Define.
	(gdb_catch_this_syscall_p): Turn into...
	(linux_process_target::gdb_catch_this_syscall): ...this.
	(linux_process_target::low_supports_catch_syscall): Define.

	Update the callers below.

	(linux_process_target::wait_1)
	(linux_process_target::supports_catch_syscall)

	* linux-x86-low.cc (class x86_target) <low_supports_catch_syscall>
	<low_get_syscall_trapinfo>: Declare.
	(x86_target::low_supports_catch_syscall): Define.
	(x86_get_syscall_trapinfo): Turn into...
	(x86_target::low_get_syscall_trapinfo): ...this.
	(the_low_target): Remove the op field.
	* linux-aarch64-low.cc (class aarch64_target)
	<low_supports_catch_syscall>
	<low_get_syscall_trapinfo>: Declare.
	(aarch64_target::low_supports_catch_syscall): Define.
	(aarch64_get_syscall_trapinfo): Turn into...
	(aarch64_target::low_get_syscall_trapinfo): ...this.
	(the_low_target): Remove the op field.
	* linux-arm-low.cc (class arm_target) <low_supports_catch_syscall>
	<low_get_syscall_trapinfo>: Declare.
	(arm_target::low_supports_catch_syscall): Define.
	(arm_get_syscall_trapinfo): Turn into...
	(arm_target::low_get_syscall_trapinfo): ...this.
	(the_low_target): Remove the op field.
	* linux-ppc-low.cc (the_low_target): Remove the op field.
	* linux-s390-low.cc (the_low_target): Remove the op field.

1 files changed, 16 insertions, 4 deletions

diff --git a/gdbserver/linux-low.h b/gdbserver/linux-low.h
index 0182be1..1f1c382 100644
--- a/gdbserver/linux-low.h
+++ b/gdbserver/linux-low.h
@@ -131,10 +131,6 @@ struct lwp_info;
 
 struct linux_target_ops
 {
-  /* Fill *SYSNO with the syscall nr trapped.  Only to be called when
-     inferior is stopped due to SYSCALL_SIGTRAP.  */
-  void (*get_syscall_trapinfo) (struct regcache *regcache, int *sysno);
-
   /* See target.h.  */
   int (*get_ipa_tdesc_idx) (void);
 };
@@ -591,6 +587,14 @@ private: /* Back to private.  */
   fast_tpoint_collect_result linux_fast_tracepoint_collecting
     (lwp_info *lwp, fast_tpoint_collect_status *status);
 
+  /* This function should only be called if LWP got a SYSCALL_SIGTRAP.
+     Fill *SYSNO with the syscall nr trapped.  */
+  void get_syscall_trapinfo (lwp_info *lwp, int *sysno);
+
+  /* Returns true if GDB is interested in the event_child syscall.
+     Only to be called when stopped reason is SYSCALL_SIGTRAP.  */
+  bool gdb_catch_this_syscall (lwp_info *event_child);
+
 protected:
   /* The architecture-specific "low" methods are listed below.  */
 
@@ -684,6 +688,14 @@ protected:
   /* Returns true if the low target supports range stepping.  */
   virtual bool low_supports_range_stepping ();
 
+  /* Return true if the target supports catch syscall.  Such targets
+     override the low_get_syscall_trapinfo method below.  */
+  virtual bool low_supports_catch_syscall ();
+
+  /* Fill *SYSNO with the syscall nr trapped.  Only to be called when
+     inferior is stopped due to SYSCALL_SIGTRAP.  */
+  virtual void low_get_syscall_trapinfo (regcache *regcache, int *sysno);
+
   /* How many bytes the PC should be decremented after a break.  */
   virtual int low_decr_pc_after_break ();
 };