First draft of the sh4 port

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index a843841723cb2102b9787cacc5a24013538eaa60..cf27ea256b59bfe1abf76dfe4fe87dbfd65f3c68 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -97,11 +97,21 @@ namespace internal {
 #define CODE_STUB_LIST_MIPS(V)
 #endif
 
+// List of code stubs only used on SH4 platforms
+#ifdef V8_TARGET_ARCH_SH4
+# define CODE_STUB_LIST_SH4(V)  \
+  V(RegExpCEntry)               \
+  V(DirectCEntry)
+#else
+#define CODE_STUB_LIST_SH4(V)
+#endif
+
 // Combined list of code stubs.
 #define CODE_STUB_LIST(V)            \
   CODE_STUB_LIST_ALL_PLATFORMS(V)    \
   CODE_STUB_LIST_ARM(V)              \
-  CODE_STUB_LIST_MIPS(V)
+  CODE_STUB_LIST_MIPS(V)             \
+  CODE_STUB_LIST_SH4(V)
 
 // Mode to overwrite BinaryExpression values.
 enum OverwriteMode { NO_OVERWRITE, OVERWRITE_LEFT, OVERWRITE_RIGHT };
@@ -256,6 +266,8 @@ class RuntimeCallHelper {
 #include "arm/code-stubs-arm.h"
 #elif V8_TARGET_ARCH_MIPS
 #include "mips/code-stubs-mips.h"
+#elif V8_TARGET_ARCH_SH4
+#include "sh4/code-stubs-sh4.h"
 #else
 #error Unsupported target architecture.
 #endif