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diff --git a/src/processor/stackwalker_amd64.cc b/src/processor/stackwalker_amd64.cc
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+// Copyright (c) 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// stackwalker_amd64.cc: amd64-specific stackwalker.
+//
+// See stackwalker_amd64.h for documentation.
+//
+// Author: Mark Mentovai, Ted Mielczarek
+
+
+#include "processor/stackwalker_amd64.h"
+#include "google_breakpad/processor/call_stack.h"
+#include "google_breakpad/processor/memory_region.h"
+#include "google_breakpad/processor/stack_frame_cpu.h"
+#include "processor/logging.h"
+
+namespace google_breakpad {
+
+
+StackwalkerAMD64::StackwalkerAMD64(const SystemInfo *system_info,
+                                   const MDRawContextAMD64 *context,
+                                   MemoryRegion *memory,
+                                   const CodeModules *modules,
+                                   SymbolSupplier *supplier,
+                                   SourceLineResolverInterface *resolver)
+    : Stackwalker(system_info, memory, modules, supplier, resolver),
+      context_(context) {
+}
+
+
+StackFrame* StackwalkerAMD64::GetContextFrame() {
+  if (!context_ || !memory_) {
+    BPLOG(ERROR) << "Can't get context frame without context or memory";
+    return NULL;
+  }
+
+  StackFrameAMD64 *frame = new StackFrameAMD64();
+
+  // The instruction pointer is stored directly in a register, so pull it
+  // straight out of the CPU context structure.
+  frame->context = *context_;
+  frame->context_validity = StackFrameAMD64::CONTEXT_VALID_ALL;
+  frame->instruction = frame->context.rip;
+
+  return frame;
+}
+
+
+StackFrame* StackwalkerAMD64::GetCallerFrame(
+    const CallStack *stack,
+    const vector< linked_ptr<StackFrameInfo> > &stack_frame_info) {
+  if (!memory_ || !stack) {
+    BPLOG(ERROR) << "Can't get caller frame without memory or stack";
+    return NULL;
+  }
+
+  StackFrameAMD64 *last_frame = static_cast<StackFrameAMD64*>(
+      stack->frames()->back());
+
+  //FIXME: this pretty much doesn't work at all due to FPO
+  // being enabled by default.
+  // Brain-dead stackwalking:
+  // %rip_new = *(%rbp_old + 8)
+  // %rsp_new = %rbp_old + 16
+  // %rbp_new = *(%rbp_old)
+
+  // A caller frame must reside higher in memory than its callee frames.
+  // Anything else is an error, or an indication that we've reached the
+  // end of the stack.
+  u_int64_t stack_pointer = last_frame->context.rbp + 16;
+  if (stack_pointer <= last_frame->context.rsp) {
+    return NULL;
+  }
+
+  u_int64_t instruction;
+  if (!memory_->GetMemoryAtAddress(last_frame->context.rbp + 8,
+                                   &instruction) ||
+      instruction <= 1) {
+    return NULL;
+  }
+
+  u_int64_t stack_base;
+  if (!memory_->GetMemoryAtAddress(last_frame->context.rbp,
+                                   &stack_base) ||
+      stack_base <= 1) {
+    return NULL;
+  }
+
+  StackFrameAMD64 *frame = new StackFrameAMD64();
+
+  frame->context = last_frame->context;
+  frame->context.rip = instruction;
+  frame->context.rsp = stack_pointer;
+  frame->context.rbp = stack_base;
+  frame->context_validity = StackFrameAMD64::CONTEXT_VALID_RIP |
+                            StackFrameAMD64::CONTEXT_VALID_RSP |
+                            StackFrameAMD64::CONTEXT_VALID_RBP;
+
+  frame->instruction = frame->context.rip - 1;
+
+  return frame;
+}
+
+
+}  // namespace google_breakpad