src/cpu/aarch64/vm/macroAssembler_aarch64.cpp

rev 12502 : 8172144: AArch64: Implement "JEP 270: Reserved Stack Areas for Critical Sections"
Reviewed-by: duke

*** 400,409 ****
--- 400,433 ----
      if (cbuf) cbuf->set_insts_mark();
      b(entry);
    }
  }
  
+ void MacroAssembler::reserved_stack_check() {
+     // testing if reserved zone needs to be enabled
+     Label no_reserved_zone_enabling;
+ 
+     ldr(rscratch1, Address(rthread, JavaThread::reserved_stack_activation_offset()));
+     cmp(sp, rscratch1);
+     br(Assembler::LO, no_reserved_zone_enabling);
+ 
+     enter();   // LR and FP are live.
+     lea(rscratch1, CAST_FROM_FN_PTR(address, SharedRuntime::enable_stack_reserved_zone));
+     mov(c_rarg0, rthread);
+     blr(rscratch1);
+     leave();
+ 
+     // We have already removed our own frame.
+     // throw_delayed_StackOverflowError will think that it's been
+     // called by our caller.
+     lea(rscratch1, RuntimeAddress(StubRoutines::throw_delayed_StackOverflowError_entry()));
+     br(rscratch1);
+     should_not_reach_here();
+ 
+     bind(no_reserved_zone_enabling);
+ }
+ 
  int MacroAssembler::biased_locking_enter(Register lock_reg,
                                           Register obj_reg,
                                           Register swap_reg,
                                           Register tmp_reg,
                                           bool swap_reg_contains_mark,