sw64: perf: fix perf_get_regs_user

Sunway inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I56X48

--------------------------------

The past implementation of perf_get_regs_user could not get regs by
default, but it was actually available via task_pt_regs. Fix it now.
Signed-off-by: NHe Chuyue <hechuyue@wxiat.com>
Signed-off-by: NGu Zitao <guzitao@wxiat.com>

arch/sw_64/kernel/perf_regs.c

@@ -28,6 +28,6 @@ u64 perf_reg_abi(struct task_struct *task)
 void perf_get_regs_user(struct perf_regs *regs_user,
 			struct pt_regs *regs)
 {
-	regs_user->regs = NULL;
-	regs_user->abi = PERF_SAMPLE_REGS_ABI_NONE;
+	regs_user->regs = task_pt_regs(current);
+	regs_user->abi = perf_reg_abi(current);
 }