hotspot/src/cpu/aarch64/vm/frame_aarch64.cpp
changeset 29183 0cc8699f7372
child 29192 a7438efd99ec
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/cpu/aarch64/vm/frame_aarch64.cpp	Tue Jan 20 11:34:17 2015 -0800
@@ -0,0 +1,832 @@
+/*
+ * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, Red Hat Inc. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "interpreter/interpreter.hpp"
+#include "memory/resourceArea.hpp"
+#include "oops/markOop.hpp"
+#include "oops/method.hpp"
+#include "oops/oop.inline.hpp"
+#include "prims/methodHandles.hpp"
+#include "runtime/frame.inline.hpp"
+#include "runtime/handles.inline.hpp"
+#include "runtime/javaCalls.hpp"
+#include "runtime/monitorChunk.hpp"
+#include "runtime/os.hpp"
+#include "runtime/signature.hpp"
+#include "runtime/stubCodeGenerator.hpp"
+#include "runtime/stubRoutines.hpp"
+#include "vmreg_aarch64.inline.hpp"
+#ifdef COMPILER1
+#include "c1/c1_Runtime1.hpp"
+#include "runtime/vframeArray.hpp"
+#endif
+
+#ifdef ASSERT
+void RegisterMap::check_location_valid() {
+}
+#endif
+
+
+// Profiling/safepoint support
+
+bool frame::safe_for_sender(JavaThread *thread) {
+  address   sp = (address)_sp;
+  address   fp = (address)_fp;
+  address   unextended_sp = (address)_unextended_sp;
+
+  // consider stack guards when trying to determine "safe" stack pointers
+  static size_t stack_guard_size = os::uses_stack_guard_pages() ? (StackYellowPages + StackRedPages) * os::vm_page_size() : 0;
+  size_t usable_stack_size = thread->stack_size() - stack_guard_size;
+
+  // sp must be within the usable part of the stack (not in guards)
+  bool sp_safe = (sp < thread->stack_base()) &&
+                 (sp >= thread->stack_base() - usable_stack_size);
+
+
+  if (!sp_safe) {
+    return false;
+  }
+
+  // unextended sp must be within the stack and above or equal sp
+  bool unextended_sp_safe = (unextended_sp < thread->stack_base()) &&
+                            (unextended_sp >= sp);
+
+  if (!unextended_sp_safe) {
+    return false;
+  }
+
+  // an fp must be within the stack and above (but not equal) sp
+  // second evaluation on fp+ is added to handle situation where fp is -1
+  bool fp_safe = (fp < thread->stack_base() && (fp > sp) && (((fp + (return_addr_offset * sizeof(void*))) < thread->stack_base())));
+
+  // We know sp/unextended_sp are safe only fp is questionable here
+
+  // If the current frame is known to the code cache then we can attempt to
+  // to construct the sender and do some validation of it. This goes a long way
+  // toward eliminating issues when we get in frame construction code
+
+  if (_cb != NULL ) {
+
+    // First check if frame is complete and tester is reliable
+    // Unfortunately we can only check frame complete for runtime stubs and nmethod
+    // other generic buffer blobs are more problematic so we just assume they are
+    // ok. adapter blobs never have a frame complete and are never ok.
+
+    if (!_cb->is_frame_complete_at(_pc)) {
+      if (_cb->is_nmethod() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) {
+        return false;
+      }
+    }
+
+    // Could just be some random pointer within the codeBlob
+    if (!_cb->code_contains(_pc)) {
+      return false;
+    }
+
+    // Entry frame checks
+    if (is_entry_frame()) {
+      // an entry frame must have a valid fp.
+
+      if (!fp_safe) return false;
+
+      // Validate the JavaCallWrapper an entry frame must have
+
+      address jcw = (address)entry_frame_call_wrapper();
+
+      bool jcw_safe = (jcw < thread->stack_base()) && ( jcw > fp);
+
+      return jcw_safe;
+
+    }
+
+    intptr_t* sender_sp = NULL;
+    address   sender_pc = NULL;
+
+    if (is_interpreted_frame()) {
+      // fp must be safe
+      if (!fp_safe) {
+        return false;
+      }
+
+      sender_pc = (address) this->fp()[return_addr_offset];
+      sender_sp = (intptr_t*) addr_at(sender_sp_offset);
+
+    } else {
+      // must be some sort of compiled/runtime frame
+      // fp does not have to be safe (although it could be check for c1?)
+
+      // check for a valid frame_size, otherwise we are unlikely to get a valid sender_pc
+      if (_cb->frame_size() <= 0) {
+        return false;
+      }
+
+      sender_sp = _unextended_sp + _cb->frame_size();
+      sender_pc = (address) *(sender_sp-1);
+    }
+
+
+    // If the potential sender is the interpreter then we can do some more checking
+    if (Interpreter::contains(sender_pc)) {
+
+      // fp is always saved in a recognizable place in any code we generate. However
+      // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved fp
+      // is really a frame pointer.
+
+      intptr_t *saved_fp = (intptr_t*)*(sender_sp - frame::sender_sp_offset);
+      bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp > sender_sp);
+
+      if (!saved_fp_safe) {
+        return false;
+      }
+
+      // construct the potential sender
+
+      frame sender(sender_sp, saved_fp, sender_pc);
+
+      return sender.is_interpreted_frame_valid(thread);
+
+    }
+
+    // We must always be able to find a recognizable pc
+    CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc);
+    if (sender_pc == NULL ||  sender_blob == NULL) {
+      return false;
+    }
+
+    // Could be a zombie method
+    if (sender_blob->is_zombie() || sender_blob->is_unloaded()) {
+      return false;
+    }
+
+    // Could just be some random pointer within the codeBlob
+    if (!sender_blob->code_contains(sender_pc)) {
+      return false;
+    }
+
+    // We should never be able to see an adapter if the current frame is something from code cache
+    if (sender_blob->is_adapter_blob()) {
+      return false;
+    }
+
+    // Could be the call_stub
+    if (StubRoutines::returns_to_call_stub(sender_pc)) {
+      intptr_t *saved_fp = (intptr_t*)*(sender_sp - frame::sender_sp_offset);
+      bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp > sender_sp);
+
+      if (!saved_fp_safe) {
+        return false;
+      }
+
+      // construct the potential sender
+
+      frame sender(sender_sp, saved_fp, sender_pc);
+
+      // Validate the JavaCallWrapper an entry frame must have
+      address jcw = (address)sender.entry_frame_call_wrapper();
+
+      bool jcw_safe = (jcw < thread->stack_base()) && ( jcw > (address)sender.fp());
+
+      return jcw_safe;
+    }
+
+    if (sender_blob->is_nmethod()) {
+        nmethod* nm = sender_blob->as_nmethod_or_null();
+        if (nm != NULL) {
+            if (nm->is_deopt_mh_entry(sender_pc) || nm->is_deopt_entry(sender_pc)) {
+                return false;
+            }
+        }
+    }
+
+    // If the frame size is 0 something (or less) is bad because every nmethod has a non-zero frame size
+    // because the return address counts against the callee's frame.
+
+    if (sender_blob->frame_size() <= 0) {
+      assert(!sender_blob->is_nmethod(), "should count return address at least");
+      return false;
+    }
+
+    // We should never be able to see anything here except an nmethod. If something in the
+    // code cache (current frame) is called by an entity within the code cache that entity
+    // should not be anything but the call stub (already covered), the interpreter (already covered)
+    // or an nmethod.
+
+    if (!sender_blob->is_nmethod()) {
+        return false;
+    }
+
+    // Could put some more validation for the potential non-interpreted sender
+    // frame we'd create by calling sender if I could think of any. Wait for next crash in forte...
+
+    // One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb
+
+    // We've validated the potential sender that would be created
+    return true;
+  }
+
+  // Must be native-compiled frame. Since sender will try and use fp to find
+  // linkages it must be safe
+
+  if (!fp_safe) {
+    return false;
+  }
+
+  // Will the pc we fetch be non-zero (which we'll find at the oldest frame)
+
+  if ( (address) this->fp()[return_addr_offset] == NULL) return false;
+
+
+  // could try and do some more potential verification of native frame if we could think of some...
+
+  return true;
+
+}
+
+void frame::patch_pc(Thread* thread, address pc) {
+  address* pc_addr = &(((address*) sp())[-1]);
+  if (TracePcPatching) {
+    tty->print_cr("patch_pc at address " INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "]",
+                  p2i(pc_addr), p2i(*pc_addr), p2i(pc));
+  }
+  // Either the return address is the original one or we are going to
+  // patch in the same address that's already there.
+  assert(_pc == *pc_addr || pc == *pc_addr, "must be");
+  *pc_addr = pc;
+  _cb = CodeCache::find_blob(pc);
+  address original_pc = nmethod::get_deopt_original_pc(this);
+  if (original_pc != NULL) {
+    assert(original_pc == _pc, "expected original PC to be stored before patching");
+    _deopt_state = is_deoptimized;
+    // leave _pc as is
+  } else {
+    _deopt_state = not_deoptimized;
+    _pc = pc;
+  }
+}
+
+bool frame::is_interpreted_frame() const  {
+  return Interpreter::contains(pc());
+}
+
+int frame::frame_size(RegisterMap* map) const {
+  frame sender = this->sender(map);
+  return sender.sp() - sp();
+}
+
+intptr_t* frame::entry_frame_argument_at(int offset) const {
+  // convert offset to index to deal with tsi
+  int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
+  // Entry frame's arguments are always in relation to unextended_sp()
+  return &unextended_sp()[index];
+}
+
+// sender_sp
+#ifdef CC_INTERP
+intptr_t* frame::interpreter_frame_sender_sp() const {
+  assert(is_interpreted_frame(), "interpreted frame expected");
+  // QQQ why does this specialize method exist if frame::sender_sp() does same thing?
+  // seems odd and if we always know interpreted vs. non then sender_sp() is really
+  // doing too much work.
+  return get_interpreterState()->sender_sp();
+}
+
+// monitor elements
+
+BasicObjectLock* frame::interpreter_frame_monitor_begin() const {
+  return get_interpreterState()->monitor_base();
+}
+
+BasicObjectLock* frame::interpreter_frame_monitor_end() const {
+  return (BasicObjectLock*) get_interpreterState()->stack_base();
+}
+
+#else // CC_INTERP
+
+intptr_t* frame::interpreter_frame_sender_sp() const {
+  assert(is_interpreted_frame(), "interpreted frame expected");
+  return (intptr_t*) at(interpreter_frame_sender_sp_offset);
+}
+
+void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) {
+  assert(is_interpreted_frame(), "interpreted frame expected");
+  ptr_at_put(interpreter_frame_sender_sp_offset, (intptr_t) sender_sp);
+}
+
+
+// monitor elements
+
+BasicObjectLock* frame::interpreter_frame_monitor_begin() const {
+  return (BasicObjectLock*) addr_at(interpreter_frame_monitor_block_bottom_offset);
+}
+
+BasicObjectLock* frame::interpreter_frame_monitor_end() const {
+  BasicObjectLock* result = (BasicObjectLock*) *addr_at(interpreter_frame_monitor_block_top_offset);
+  // make sure the pointer points inside the frame
+  assert(sp() <= (intptr_t*) result, "monitor end should be above the stack pointer");
+  assert((intptr_t*) result < fp(),  "monitor end should be strictly below the frame pointer");
+  return result;
+}
+
+void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) {
+  *((BasicObjectLock**)addr_at(interpreter_frame_monitor_block_top_offset)) = value;
+}
+
+// Used by template based interpreter deoptimization
+void frame::interpreter_frame_set_last_sp(intptr_t* sp) {
+    *((intptr_t**)addr_at(interpreter_frame_last_sp_offset)) = sp;
+}
+#endif // CC_INTERP
+
+frame frame::sender_for_entry_frame(RegisterMap* map) const {
+  assert(map != NULL, "map must be set");
+  // Java frame called from C; skip all C frames and return top C
+  // frame of that chunk as the sender
+  JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
+  assert(!entry_frame_is_first(), "next Java fp must be non zero");
+  assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
+  map->clear();
+  assert(map->include_argument_oops(), "should be set by clear");
+  if (jfa->last_Java_pc() != NULL ) {
+    frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
+    return fr;
+  }
+  frame fr(jfa->last_Java_sp(), jfa->last_Java_fp());
+  return fr;
+}
+
+//------------------------------------------------------------------------------
+// frame::verify_deopt_original_pc
+//
+// Verifies the calculated original PC of a deoptimization PC for the
+// given unextended SP.  The unextended SP might also be the saved SP
+// for MethodHandle call sites.
+#ifdef ASSERT
+void frame::verify_deopt_original_pc(nmethod* nm, intptr_t* unextended_sp, bool is_method_handle_return) {
+  frame fr;
+
+  // This is ugly but it's better than to change {get,set}_original_pc
+  // to take an SP value as argument.  And it's only a debugging
+  // method anyway.
+  fr._unextended_sp = unextended_sp;
+
+  address original_pc = nm->get_original_pc(&fr);
+  assert(nm->insts_contains(original_pc), "original PC must be in nmethod");
+  assert(nm->is_method_handle_return(original_pc) == is_method_handle_return, "must be");
+}
+#endif
+
+//------------------------------------------------------------------------------
+// frame::adjust_unextended_sp
+void frame::adjust_unextended_sp() {
+  // If we are returning to a compiled MethodHandle call site, the
+  // saved_fp will in fact be a saved value of the unextended SP.  The
+  // simplest way to tell whether we are returning to such a call site
+  // is as follows:
+
+  nmethod* sender_nm = (_cb == NULL) ? NULL : _cb->as_nmethod_or_null();
+  if (sender_nm != NULL) {
+    // If the sender PC is a deoptimization point, get the original
+    // PC.  For MethodHandle call site the unextended_sp is stored in
+    // saved_fp.
+    if (sender_nm->is_deopt_mh_entry(_pc)) {
+      DEBUG_ONLY(verify_deopt_mh_original_pc(sender_nm, _fp));
+      _unextended_sp = _fp;
+    }
+    else if (sender_nm->is_deopt_entry(_pc)) {
+      DEBUG_ONLY(verify_deopt_original_pc(sender_nm, _unextended_sp));
+    }
+    else if (sender_nm->is_method_handle_return(_pc)) {
+      _unextended_sp = _fp;
+    }
+  }
+}
+
+//------------------------------------------------------------------------------
+// frame::update_map_with_saved_link
+void frame::update_map_with_saved_link(RegisterMap* map, intptr_t** link_addr) {
+  // The interpreter and compiler(s) always save fp in a known
+  // location on entry. We must record where that location is
+  // so that if fp was live on callout from c2 we can find
+  // the saved copy no matter what it called.
+
+  // Since the interpreter always saves fp if we record where it is then
+  // we don't have to always save fp on entry and exit to c2 compiled
+  // code, on entry will be enough.
+  map->set_location(rfp->as_VMReg(), (address) link_addr);
+  // this is weird "H" ought to be at a higher address however the
+  // oopMaps seems to have the "H" regs at the same address and the
+  // vanilla register.
+  // XXXX make this go away
+  if (true) {
+    map->set_location(rfp->as_VMReg()->next(), (address) link_addr);
+  }
+}
+
+
+//------------------------------------------------------------------------------
+// frame::sender_for_interpreter_frame
+frame frame::sender_for_interpreter_frame(RegisterMap* map) const {
+  // SP is the raw SP from the sender after adapter or interpreter
+  // extension.
+  intptr_t* sender_sp = this->sender_sp();
+
+  // This is the sp before any possible extension (adapter/locals).
+  intptr_t* unextended_sp = interpreter_frame_sender_sp();
+
+#ifdef COMPILER2
+  if (map->update_map()) {
+    update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset));
+  }
+#endif // COMPILER2
+
+  return frame(sender_sp, unextended_sp, link(), sender_pc());
+}
+
+
+//------------------------------------------------------------------------------
+// frame::sender_for_compiled_frame
+frame frame::sender_for_compiled_frame(RegisterMap* map) const {
+  // we cannot rely upon the last fp having been saved to the thread
+  // in C2 code but it will have been pushed onto the stack. so we
+  // have to find it relative to the unextended sp
+
+  assert(_cb->frame_size() >= 0, "must have non-zero frame size");
+  intptr_t* l_sender_sp = unextended_sp() + _cb->frame_size();
+  intptr_t* unextended_sp = l_sender_sp;
+
+  // the return_address is always the word on the stack
+  address sender_pc = (address) *(l_sender_sp-1);
+
+  intptr_t** saved_fp_addr = (intptr_t**) (l_sender_sp - frame::sender_sp_offset);
+
+  // assert (sender_sp() == l_sender_sp, "should be");
+  // assert (*saved_fp_addr == link(), "should be");
+
+  if (map->update_map()) {
+    // Tell GC to use argument oopmaps for some runtime stubs that need it.
+    // For C1, the runtime stub might not have oop maps, so set this flag
+    // outside of update_register_map.
+    map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread()));
+    if (_cb->oop_maps() != NULL) {
+      OopMapSet::update_register_map(this, map);
+    }
+
+    // Since the prolog does the save and restore of FP there is no
+    // oopmap for it so we must fill in its location as if there was
+    // an oopmap entry since if our caller was compiled code there
+    // could be live jvm state in it.
+    update_map_with_saved_link(map, saved_fp_addr);
+  }
+
+  return frame(l_sender_sp, unextended_sp, *saved_fp_addr, sender_pc);
+}
+
+//------------------------------------------------------------------------------
+// frame::sender
+frame frame::sender(RegisterMap* map) const {
+  // Default is we done have to follow them. The sender_for_xxx will
+  // update it accordingly
+   map->set_include_argument_oops(false);
+
+  if (is_entry_frame())
+    return sender_for_entry_frame(map);
+  if (is_interpreted_frame())
+    return sender_for_interpreter_frame(map);
+  assert(_cb == CodeCache::find_blob(pc()),"Must be the same");
+
+  // This test looks odd: why is it not is_compiled_frame() ?  That's
+  // because stubs also have OOP maps.
+  if (_cb != NULL) {
+    return sender_for_compiled_frame(map);
+  }
+
+  // Must be native-compiled frame, i.e. the marshaling code for native
+  // methods that exists in the core system.
+  return frame(sender_sp(), link(), sender_pc());
+}
+
+bool frame::interpreter_frame_equals_unpacked_fp(intptr_t* fp) {
+  assert(is_interpreted_frame(), "must be interpreter frame");
+  Method* method = interpreter_frame_method();
+  // When unpacking an optimized frame the frame pointer is
+  // adjusted with:
+  int diff = (method->max_locals() - method->size_of_parameters()) *
+             Interpreter::stackElementWords;
+  return _fp == (fp - diff);
+}
+
+bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
+// QQQ
+#ifdef CC_INTERP
+#else
+  assert(is_interpreted_frame(), "Not an interpreted frame");
+  // These are reasonable sanity checks
+  if (fp() == 0 || (intptr_t(fp()) & (wordSize-1)) != 0) {
+    return false;
+  }
+  if (sp() == 0 || (intptr_t(sp()) & (wordSize-1)) != 0) {
+    return false;
+  }
+  if (fp() + interpreter_frame_initial_sp_offset < sp()) {
+    return false;
+  }
+  // These are hacks to keep us out of trouble.
+  // The problem with these is that they mask other problems
+  if (fp() <= sp()) {        // this attempts to deal with unsigned comparison above
+    return false;
+  }
+
+  // do some validation of frame elements
+
+  // first the method
+
+  Method* m = *interpreter_frame_method_addr();
+
+  // validate the method we'd find in this potential sender
+  if (!m->is_valid_method()) return false;
+
+  // stack frames shouldn't be much larger than max_stack elements
+
+  if (fp() - sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
+    return false;
+  }
+
+  // validate bci/bcx
+
+  address  bcp    = interpreter_frame_bcp();
+  if (m->validate_bci_from_bcp(bcp) < 0) {
+    return false;
+  }
+
+  // validate constantPoolCache*
+  ConstantPoolCache* cp = *interpreter_frame_cache_addr();
+  if (cp == NULL || !cp->is_metaspace_object()) return false;
+
+  // validate locals
+
+  address locals =  (address) *interpreter_frame_locals_addr();
+
+  if (locals > thread->stack_base() || locals < (address) fp()) return false;
+
+  // We'd have to be pretty unlucky to be mislead at this point
+
+#endif // CC_INTERP
+  return true;
+}
+
+BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {
+#ifdef CC_INTERP
+  // Needed for JVMTI. The result should always be in the
+  // interpreterState object
+  interpreterState istate = get_interpreterState();
+#endif // CC_INTERP
+  assert(is_interpreted_frame(), "interpreted frame expected");
+  Method* method = interpreter_frame_method();
+  BasicType type = method->result_type();
+
+  intptr_t* tos_addr;
+  if (method->is_native()) {
+    // TODO : ensure AARCH64 does the same as Intel here i.e. push v0 then r0
+    // Prior to calling into the runtime to report the method_exit the possible
+    // return value is pushed to the native stack. If the result is a jfloat/jdouble
+    // then ST0 is saved before EAX/EDX. See the note in generate_native_result
+    tos_addr = (intptr_t*)sp();
+    if (type == T_FLOAT || type == T_DOUBLE) {
+      // This is times two because we do a push(ltos) after pushing XMM0
+      // and that takes two interpreter stack slots.
+      tos_addr += 2 * Interpreter::stackElementWords;
+    }
+  } else {
+    tos_addr = (intptr_t*)interpreter_frame_tos_address();
+  }
+
+  switch (type) {
+    case T_OBJECT  :
+    case T_ARRAY   : {
+      oop obj;
+      if (method->is_native()) {
+#ifdef CC_INTERP
+        obj = istate->_oop_temp;
+#else
+        obj = cast_to_oop(at(interpreter_frame_oop_temp_offset));
+#endif // CC_INTERP
+      } else {
+        oop* obj_p = (oop*)tos_addr;
+        obj = (obj_p == NULL) ? (oop)NULL : *obj_p;
+      }
+      assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check");
+      *oop_result = obj;
+      break;
+    }
+    case T_BOOLEAN : value_result->z = *(jboolean*)tos_addr; break;
+    case T_BYTE    : value_result->b = *(jbyte*)tos_addr; break;
+    case T_CHAR    : value_result->c = *(jchar*)tos_addr; break;
+    case T_SHORT   : value_result->s = *(jshort*)tos_addr; break;
+    case T_INT     : value_result->i = *(jint*)tos_addr; break;
+    case T_LONG    : value_result->j = *(jlong*)tos_addr; break;
+    case T_FLOAT   : {
+        value_result->f = *(jfloat*)tos_addr;
+      break;
+    }
+    case T_DOUBLE  : value_result->d = *(jdouble*)tos_addr; break;
+    case T_VOID    : /* Nothing to do */ break;
+    default        : ShouldNotReachHere();
+  }
+
+  return type;
+}
+
+
+intptr_t* frame::interpreter_frame_tos_at(jint offset) const {
+  int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
+  return &interpreter_frame_tos_address()[index];
+}
+
+#ifndef PRODUCT
+
+#define DESCRIBE_FP_OFFSET(name) \
+  values.describe(frame_no, fp() + frame::name##_offset, #name)
+
+void frame::describe_pd(FrameValues& values, int frame_no) {
+  if (is_interpreted_frame()) {
+    DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
+    DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
+    DESCRIBE_FP_OFFSET(interpreter_frame_method);
+    DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
+    DESCRIBE_FP_OFFSET(interpreter_frame_cache);
+    DESCRIBE_FP_OFFSET(interpreter_frame_locals);
+    DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
+    DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
+  }
+}
+#endif
+
+intptr_t *frame::initial_deoptimization_info() {
+  // Not used on aarch64, but we must return something.
+  return NULL;
+}
+
+intptr_t* frame::real_fp() const {
+  if (_cb != NULL) {
+    // use the frame size if valid
+    int size = _cb->frame_size();
+    if (size > 0) {
+      return unextended_sp() + size;
+    }
+  }
+  // else rely on fp()
+  assert(! is_compiled_frame(), "unknown compiled frame size");
+  return fp();
+}
+
+#undef DESCRIBE_FP_OFFSET
+
+#define DESCRIBE_FP_OFFSET(name)                                        \
+  {                                                                     \
+    unsigned long *p = (unsigned long *)fp;                             \
+    printf("0x%016lx 0x%016lx %s\n", (unsigned long)(p + frame::name##_offset), \
+           p[frame::name##_offset], #name);                             \
+  }
+
+static __thread unsigned long nextfp;
+static __thread unsigned long nextpc;
+static __thread unsigned long nextsp;
+static __thread RegisterMap *reg_map;
+
+static void printbc(Method *m, intptr_t bcx) {
+  const char *name;
+  char buf[16];
+  if (m->validate_bci_from_bcp((address)bcx) < 0
+      || !m->contains((address)bcx)) {
+    name = "???";
+    snprintf(buf, sizeof buf, "(bad)");
+  } else {
+    int bci = m->bci_from((address)bcx);
+    snprintf(buf, sizeof buf, "%d", bci);
+    name = Bytecodes::name(m->code_at(bci));
+  }
+  ResourceMark rm;
+  printf("%s : %s ==> %s\n", m->name_and_sig_as_C_string(), buf, name);
+}
+
+void internal_pf(unsigned long sp, unsigned long fp, unsigned long pc, unsigned long bcx) {
+  if (! fp)
+    return;
+
+  DESCRIBE_FP_OFFSET(return_addr);
+  DESCRIBE_FP_OFFSET(link);
+  DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
+  DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
+  DESCRIBE_FP_OFFSET(interpreter_frame_method);
+  DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
+  DESCRIBE_FP_OFFSET(interpreter_frame_cache);
+  DESCRIBE_FP_OFFSET(interpreter_frame_locals);
+  DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
+  DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
+  unsigned long *p = (unsigned long *)fp;
+
+  // We want to see all frames, native and Java.  For compiled and
+  // interpreted frames we have special information that allows us to
+  // unwind them; for everything else we assume that the native frame
+  // pointer chain is intact.
+  frame this_frame((intptr_t*)sp, (intptr_t*)fp, (address)pc);
+  if (this_frame.is_compiled_frame() ||
+      this_frame.is_interpreted_frame()) {
+    frame sender = this_frame.sender(reg_map);
+    nextfp = (unsigned long)sender.fp();
+    nextpc = (unsigned long)sender.pc();
+    nextsp = (unsigned long)sender.unextended_sp();
+  } else {
+    nextfp = p[frame::link_offset];
+    nextpc = p[frame::return_addr_offset];
+    nextsp = (unsigned long)&p[frame::sender_sp_offset];
+  }
+
+  if (bcx == -1ul)
+    bcx = p[frame::interpreter_frame_bcp_offset];
+
+  if (Interpreter::contains((address)pc)) {
+    Method* m = (Method*)p[frame::interpreter_frame_method_offset];
+    if(m && m->is_method()) {
+      printbc(m, bcx);
+    } else
+      printf("not a Method\n");
+  } else {
+    CodeBlob *cb = CodeCache::find_blob((address)pc);
+    if (cb != NULL) {
+      if (cb->is_nmethod()) {
+        ResourceMark rm;
+        nmethod* nm = (nmethod*)cb;
+        printf("nmethod %s\n", nm->method()->name_and_sig_as_C_string());
+      } else if (cb->name()) {
+        printf("CodeBlob %s\n", cb->name());
+      }
+    }
+  }
+}
+
+extern "C" void npf() {
+  CodeBlob *cb = CodeCache::find_blob((address)nextpc);
+  // C2 does not always chain the frame pointers when it can, instead
+  // preferring to use fixed offsets from SP, so a simple leave() does
+  // not work.  Instead, it adds the frame size to SP then pops FP and
+  // LR.  We have to do the same thing to get a good call chain.
+  if (cb && cb->frame_size())
+    nextfp = nextsp + wordSize * (cb->frame_size() - 2);
+  internal_pf (nextsp, nextfp, nextpc, -1);
+}
+
+extern "C" void pf(unsigned long sp, unsigned long fp, unsigned long pc,
+                   unsigned long bcx, unsigned long thread) {
+  RegisterMap map((JavaThread*)thread, false);
+  if (!reg_map) {
+    reg_map = (RegisterMap*)os::malloc(sizeof map, mtNone);
+  }
+  memcpy(reg_map, &map, sizeof map);
+  {
+    CodeBlob *cb = CodeCache::find_blob((address)pc);
+    if (cb && cb->frame_size())
+      fp = sp + wordSize * (cb->frame_size() - 2);
+  }
+  internal_pf(sp, fp, pc, bcx);
+}
+
+// support for printing out where we are in a Java method
+// needs to be passed current fp and bcp register values
+// prints method name, bc index and bytecode name
+extern "C" void pm(unsigned long fp, unsigned long bcx) {
+  DESCRIBE_FP_OFFSET(interpreter_frame_method);
+  unsigned long *p = (unsigned long *)fp;
+  Method* m = (Method*)p[frame::interpreter_frame_method_offset];
+  printbc(m, bcx);
+}
+
+#ifndef PRODUCT
+// This is a generic constructor which is only used by pns() in debug.cpp.
+frame::frame(void* sp, void* fp, void* pc) {
+  init((intptr_t*)sp, (intptr_t*)fp, (address)pc);
+}
+#endif