From 25372a9e7aea0b86fa8c6e2463fc53b283255849 Mon Sep 17 00:00:00 2001
From: roland <unknown>
Date: Mon, 27 Feb 2012 11:42:30 +0100
Subject: [PATCH] 7148486: At a method handle call returning with an exception
 may call the runtime with misaligned stack (x64) Summary: stack must be
 realigned when calling the runtime for exception propagation at a call.
 Reviewed-by: kvn, never

---
 src/cpu/x86/vm/c1_Runtime1_x86.cpp      | 22 +++++++++++++++++++---
 src/cpu/x86/vm/sharedRuntime_x86_64.cpp | 10 +++++++---
 2 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/src/cpu/x86/vm/c1_Runtime1_x86.cpp b/src/cpu/x86/vm/c1_Runtime1_x86.cpp
index 5f2cf3886..30df6087d 100644
--- a/src/cpu/x86/vm/c1_Runtime1_x86.cpp
+++ b/src/cpu/x86/vm/c1_Runtime1_x86.cpp
@@ -47,6 +47,12 @@ int StubAssembler::call_RT(Register oop_result1, Register oop_result2, address e
   assert(!(oop_result1->is_valid() || oop_result2->is_valid()) || oop_result1 != oop_result2, "registers must be different");
   assert(oop_result1 != thread && oop_result2 != thread, "registers must be different");
   assert(args_size >= 0, "illegal args_size");
+  bool align_stack = false;
+#ifdef _LP64
+  // At a method handle call, the stack may not be properly aligned
+  // when returning with an exception.
+  align_stack = (stub_id() == Runtime1::handle_exception_from_callee_id);
+#endif
 
 #ifdef _LP64
   mov(c_rarg0, thread);
@@ -59,11 +65,21 @@ int StubAssembler::call_RT(Register oop_result1, Register oop_result2, address e
   push(thread);
 #endif // _LP64
 
-  set_last_Java_frame(thread, noreg, rbp, NULL);
+  int call_offset;
+  if (!align_stack) {
+    set_last_Java_frame(thread, noreg, rbp, NULL);
+  } else {
+    address the_pc = pc();
+    call_offset = offset();
+    set_last_Java_frame(thread, noreg, rbp, the_pc);
+    andptr(rsp, -(StackAlignmentInBytes));    // Align stack
+  }
 
   // do the call
   call(RuntimeAddress(entry));
-  int call_offset = offset();
+  if (!align_stack) {
+    call_offset = offset();
+  }
   // verify callee-saved register
 #ifdef ASSERT
   guarantee(thread != rax, "change this code");
@@ -78,7 +94,7 @@ int StubAssembler::call_RT(Register oop_result1, Register oop_result2, address e
   }
   pop(rax);
 #endif
-  reset_last_Java_frame(thread, true, false);
+  reset_last_Java_frame(thread, true, align_stack);
 
   // discard thread and arguments
   NOT_LP64(addptr(rsp, num_rt_args()*BytesPerWord));
diff --git a/src/cpu/x86/vm/sharedRuntime_x86_64.cpp b/src/cpu/x86/vm/sharedRuntime_x86_64.cpp
index b7af4544d..6c2a56545 100644
--- a/src/cpu/x86/vm/sharedRuntime_x86_64.cpp
+++ b/src/cpu/x86/vm/sharedRuntime_x86_64.cpp
@@ -3620,8 +3620,12 @@ void OptoRuntime::generate_exception_blob() {
   //
   // address OptoRuntime::handle_exception_C(JavaThread* thread)
 
-  __ set_last_Java_frame(noreg, noreg, NULL);
+  // At a method handle call, the stack may not be properly aligned
+  // when returning with an exception.
+  address the_pc = __ pc();
+  __ set_last_Java_frame(noreg, noreg, the_pc);
   __ mov(c_rarg0, r15_thread);
+  __ andptr(rsp, -(StackAlignmentInBytes));    // Align stack
   __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, OptoRuntime::handle_exception_C)));
 
   // Set an oopmap for the call site.  This oopmap will only be used if we
@@ -3632,9 +3636,9 @@ void OptoRuntime::generate_exception_blob() {
 
   OopMapSet* oop_maps = new OopMapSet();
 
-  oop_maps->add_gc_map( __ pc()-start, new OopMap(SimpleRuntimeFrame::framesize, 0));
+  oop_maps->add_gc_map(the_pc - start, new OopMap(SimpleRuntimeFrame::framesize, 0));
 
-  __ reset_last_Java_frame(false, false);
+  __ reset_last_Java_frame(false, true);
 
   // Restore callee-saved registers
 
-- 
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