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

All the linux low targets except arm define the
'supports_hardware_single_step' op to return true.  Hence, we override
the method to return true in linux_process_target, and remove the
definitions in all the linux low targets but arm.

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

	Remove the 'supports_hardware_single_step' linux target op and
	override the process_stratum_target's op definition in
	linux_process_target to return true.

	* linux-low.h (struct linux_target_ops): Remove the op.
	(class linux_process_target) <finish_step_over>
	<maybe_hw_step>: Declare.
	* linux-low.cc (can_hardware_single_step): Remove.
	(maybe_hw_step): Turn into...
	(linux_process_target::maybe_hw_step): ...this.
	(finish_step_over): Turn into...
	(linux_process_target::finish_step_over): ...this.
	(linux_process_target::supports_hardware_single_step): Update
	to return true.

	Update the callers below.

	(linux_process_target::single_step)
	(linux_process_target::resume_one_lwp_throw)

	* linux-arm-low.cc (class arm_target)
	<supports_hardware_single_step>: Declare.
	(arm_supports_hardware_single_step): Turn into...
	(arm_target::supports_hardware_single_step): ...this.
	(the_low_target): Remove the op field.
	* linux-x86-low.cc (x86_supports_hardware_single_step): Remove.
	(the_low_target): Remove the op field.
	* linux-aarch64-low.cc (aarch64_supports_hardware_single_step):
	Remove.
	(the_low_target): Remove the op field.
	* linux-bfin-low.cc (bfin_supports_hardware_single_step): Remove.
	(the_low_target): Remove the op field.
	* linux-crisv32-low.cc (cris_supports_hardware_single_step): Remove.
	(the_low_target): Remove the op field.
	* linux-m32r-low.cc (m32r_supports_hardware_single_step): Remove.
	(the_low_target): Remove the op field.
	* linux-m68k-low.cc (m68k_supports_hardware_single_step): Remove.
	(the_low_target): Remove the op field.
	* linux-ppc-low.cc (ppc_supports_hardware_single_step): Remove.
	(the_low_target): Remove the op field.
	* linux-s390-low.cc (s390_supports_hardware_single_step): Remove.
	(the_low_target): Remove the op field.
	* linux-sh-low.cc (sh_supports_hardware_single_step): Remove.
	(the_low_target): Remove the op field.
	* linux-tic6x-low.cc (tic6x_supports_hardware_single_step): Remove.
	(the_low_target): Remove the op field.
	* linux-tile-low.cc (tile_supports_hardware_single_step): Remove.
	(the_low_target): Remove the op field.
	* linux-xtensa-low.cc (xtensa_supports_hardware_single_step):
	Remove.
	(the_low_target): Remove the op field.

1 files changed, 5 insertions, 4 deletions

diff --git a/gdbserver/linux-arm-low.cc b/gdbserver/linux-arm-low.cc
index a7d5261..2e3d00a 100644
--- a/gdbserver/linux-arm-low.cc
+++ b/gdbserver/linux-arm-low.cc
@@ -72,6 +72,8 @@ public:
 
   bool supports_z_point_type (char z_type) override;
 
+  bool supports_hardware_single_step () override;
+
 protected:
 
   void low_arch_setup () override;
@@ -1030,10 +1032,10 @@ arm_target::low_get_next_pcs (regcache *regcache)
 
 /* Support for hardware single step.  */
 
-static int
-arm_supports_hardware_single_step (void)
+bool
+arm_target::supports_hardware_single_step ()
 {
-  return 0;
+  return false;
 }
 
 /* Implementation of linux_target_ops method "get_syscall_trapinfo".  */
@@ -1117,7 +1119,6 @@ arm_target::get_regs_info ()
 }
 
 struct linux_target_ops the_low_target = {
-  arm_supports_hardware_single_step,
   arm_get_syscall_trapinfo,
 };