First draft of the sh4 port

src/sh4/frames-sh4.h

-// Copyright 2012 the V8 project authors. All rights reserved.
+// Copyright 2011-2012 the V8 project authors. 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.
 
-#ifndef V8_X64_FRAMES_X64_H_
-#define V8_X64_FRAMES_X64_H_
+#ifndef V8_SH4_FRAMES_SH4_H_
+#define V8_SH4_FRAMES_SH4_H_
+
+#include "memory.h"
 
 namespace v8 {
 namespace internal {
 
+
+// Register lists
+// Note that the bit values must match those used in actual instruction encoding
 const int kNumRegs = 16;
+
+
+// Caller-saved registers
 const RegList kJSCallerSaved =
-    1 << 0 |  // rax
-    1 << 1 |  // rcx
-    1 << 2 |  // rdx
-    1 << 3 |  // rbx - used as a caller-saved register in JavaScript code
-    1 << 7;   // rdi - callee function
+  1 << 0 |      // r0
+  1 << 1 |      // r1
+  1 << 2 |      // r2
+  1 << 3 |      // r3
+  1 << 4 |      // r4
+  1 << 5 |      // r5
+  1 << 6 |      // r6
+  1 << 7;       // r7
 
-const int kNumJSCallerSaved = 5;
+const int kNumJSCallerSaved = 8;
+
+// Callee-saved registers preserved when switching from C to JavaScript
+const RegList kCalleeSaved =
+  1 <<  8  |  //  r8
+  1 <<  9  |  //  r9
+  1 <<  10 |  //  r10
+  1 <<  11 |  //  r11
+  1 <<  12 |  //  r12 (roots in JS)
+  1 <<  13 |  //  r13 (cp in JS)
+  1 <<  14;   //  r14 (fp in JS)
+
+const int kNumCalleeSaved = 7;
+
 
 typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved];
 
+
 // Number of registers for which space is reserved in safepoints.
 const int kNumSafepointRegisters = 16;
 
 // ----------------------------------------------------
 
+
 class StackHandlerConstants : public AllStatic {
  public:
   static const int kNextOffset     = 0 * kPointerSize;
   static const int kCodeOffset     = 1 * kPointerSize;
   static const int kStateOffset    = 2 * kPointerSize;
   static const int kContextOffset  = 3 * kPointerSize;
   static const int kFPOffset       = 4 * kPointerSize;
 
   static const int kSize = kFPOffset + kPointerSize;
 };
 
 
 class EntryFrameConstants : public AllStatic {
  public:
-#ifdef _WIN64
-  static const int kCallerFPOffset      = -10 * kPointerSize;
-#else
-  static const int kCallerFPOffset      = -8 * kPointerSize;
-#endif
-  static const int kArgvOffset          = 6 * kPointerSize;
+  static const int kCallerFPOffset      = -3 * kPointerSize;
 };
 
 
 class ExitFrameConstants : public AllStatic {
  public:
-  static const int kCodeOffset      = -2 * kPointerSize;
-  static const int kSPOffset        = -1 * kPointerSize;
+  static const int kCodeOffset = -2 * kPointerSize;
+  static const int kSPOffset = -1 * kPointerSize;
 
-  static const int kCallerFPOffset  = +0 * kPointerSize;
-  static const int kCallerPCOffset  = +1 * kPointerSize;
+  // The caller fields are below the frame pointer on the stack.
+  static const int kCallerFPOffset = 0 * kPointerSize;
+  // The calling JS function is below FP.
+  static const int kCallerPCOffset = 1 * kPointerSize;
 
   // FP-relative displacement of the caller's SP.  It points just
   // below the saved PC.
-  static const int kCallerSPDisplacement = +2 * kPointerSize;
+  static const int kCallerSPDisplacement = 2 * kPointerSize;
 };
 
 
 class StandardFrameConstants : public AllStatic {
  public:
   // Fixed part of the frame consists of return address, caller fp,
   // context and function.
   static const int kFixedFrameSize    =  4 * kPointerSize;
   static const int kExpressionsOffset = -3 * kPointerSize;
   static const int kMarkerOffset      = -2 * kPointerSize;
   static const int kContextOffset     = -1 * kPointerSize;
   static const int kCallerFPOffset    =  0 * kPointerSize;
-  static const int kCallerPCOffset    = +1 * kPointerSize;
-  static const int kCallerSPOffset    = +2 * kPointerSize;
+  static const int kCallerPCOffset    =  1 * kPointerSize;
+  static const int kCallerSPOffset    =  2 * kPointerSize;
 };
 
 
 class JavaScriptFrameConstants : public AllStatic {
  public:
   // FP-relative.
   static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
   static const int kLastParameterOffset = +2 * kPointerSize;
   static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset;
 
@@ skipping 15 matching lines @@
  public:
   static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset;
 };
 
 
 inline Object* JavaScriptFrame::function_slot_object() const {
   const int offset = JavaScriptFrameConstants::kFunctionOffset;
   return Memory::Object_at(fp() + offset);
 }
 
+
 } }  // namespace v8::internal
 
-#endif  // V8_X64_FRAMES_X64_H_
+#endif  // V8_SH4_FRAMES_SH4_H_