src/cpu/x86/vm/stubGenerator_x86_64.cpp

rev 3149 : 7147740: add assertions to check stack alignment on VM entry from generated code (x64)
Summary: check stack alignment on VM entry on x64.
Reviewed-by:

@@ -708,10 +708,25 @@
     __ ret(0);
 
     return start;
   }
 
+  // Support for intptr_t get_previous_sp()
+  //
+  // This routine is used to find the previous stack pointer for the
+  // caller.
+  address generate_get_previous_sp() {
+    StubCodeMark mark(this, "StubRoutines", "get_previous_sp");
+    address start = __ pc();
+
+    __ movptr(rax, rsp);
+    __ addptr(rax, 8); // return address is at the top of the stack.
+    __ ret(0);
+
+    return start;
+  }
+
   //----------------------------------------------------------------------------------------------------
   // Support for void verify_mxcsr()
   //
   // This routine is used with -Xcheck:jni to verify that native
   // JNI code does not return to Java code without restoring the

@@ -3058,10 +3073,11 @@
     StubRoutines::_handler_for_unsafe_access_entry =
       generate_handler_for_unsafe_access();
 
     // platform dependent
     StubRoutines::x86::_get_previous_fp_entry = generate_get_previous_fp();
+    StubRoutines::x86::_get_previous_sp_entry = generate_get_previous_sp();
 
     StubRoutines::x86::_verify_mxcsr_entry    = generate_verify_mxcsr();
 
     // Build this early so it's available for the interpreter.  Stub
     // expects the required and actual types as register arguments in