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+// Copyright (c) 2006, 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.
+
+// stack_frame_cpu.h: CPU-specific StackFrame extensions.
+//
+// These types extend the StackFrame structure to carry CPU-specific register
+// state.  They are defined in this header instead of stack_frame.h to
+// avoid the need to include minidump_format.h when only the generic
+// StackFrame type is needed.
+//
+// Author: Mark Mentovai
+
+#ifndef GOOGLE_STACK_FRAME_CPU_H__
+#define GOOGLE_STACK_FRAME_CPU_H__
+
+#include "google/stack_frame.h"
+#include "processor/minidump_format.h"
+
+namespace google_airbag {
+
+struct StackFrameX86 : public StackFrame {
+  // ContextValidity has one entry for each relevant hardware pointer register
+  // (%eip and %esp) and one entry for each nonvolatile (callee-save) register.
+  enum ContextValidity {
+    CONTEXT_VALID_NONE = 0,
+    CONTEXT_VALID_EIP  = 1 << 0,
+    CONTEXT_VALID_ESP  = 1 << 1,
+    CONTEXT_VALID_EBP  = 1 << 2,
+    CONTEXT_VALID_EBX  = 1 << 3,
+    CONTEXT_VALID_ESI  = 1 << 4,
+    CONTEXT_VALID_EDI  = 1 << 5,
+    CONTEXT_VALID_ALL  = -1
+  };
+
+  StackFrameX86() : context(), context_validity(CONTEXT_VALID_NONE) {}
+
+  // Register state.  This is only fully valid for the topmost frame in a
+  // stack.  In other frames, the values of nonvolatile registers may be
+  // present, given sufficient debugging information.  Refer to
+  // context_validity.
+  MDRawContextX86 context;
+
+  // context_validity is actually ContextValidity, but int is used because
+  // the OR operator doesn't work well with enumerated types.  This indicates
+  // which fields in context are valid.
+  int context_validity;
+};
+
+struct StackFramePPC : public StackFrame {
+  // ContextValidity should eventually contain entries for the validity of
+  // other nonvolatile (callee-save) registers as in
+  // StackFrameX86::ContextValidity, but the ppc stackwalker doesn't currently
+  // locate registers other than the ones listed here.
+  enum ContextValidity {
+    CONTEXT_VALID_NONE = 0,
+    CONTEXT_VALID_SRR0 = 1 << 0,
+    CONTEXT_VALID_GPR1 = 1 << 1,
+    CONTEXT_VALID_ALL  = -1
+  };
+
+  StackFramePPC() : context(), context_validity(CONTEXT_VALID_NONE) {}
+
+  // Register state.  This is only fully valid for the topmost frame in a
+  // stack.  In other frames, the values of nonvolatile registers may be
+  // present, given sufficient debugging information.  Refer to
+  // context_validity.
+  MDRawContextPPC context;
+
+  // context_validity is actually ContextValidity, but int is used because
+  // the OR operator doesn't work well with enumerated types.  This indicates
+  // which fields in context are valid.
+  int context_validity;
+};
+
+}  // namespace google_airbag
+
+#endif  // GOOGLE_STACK_FRAME_CPU_H__