Support for MIPS architecture.

src/mips/codegen-mips.cc

Index: src/mips/codegen-mips.cc
===================================================================
--- src/mips/codegen-mips.cc	(revision 3980)
+++ src/mips/codegen-mips.cc	(working copy)
@@ -81,7 +81,7 @@
 // a1: called JS function
 // cp: callee's context
 
-void CodeGenerator::Generate(CompilationInfo* info, Mode mode) {
+void CodeGenerator::Generate(CompilationInfo* infomode) {
   UNIMPLEMENTED_MIPS();
 }
 
@@ -467,6 +467,34 @@
 
 void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
   UNIMPLEMENTED_MIPS();
+
+  // Save callee saved registers on the stack.
+  __ MultiPush(kCalleeSaved | ra.bit());
+
+  // ********** State **********
+  //
+  // * Registers:
+  // a0: entry_address
+  // a1: function
+  // a2: reveiver_pointer
+  // a3: argc
+  //
+  // * Stack:
+  // ---------------------------
+  // args
+  // ---------------------------
+  // 4 args slots
+  // ---------------------------
+  // callee saved registers + ra
+  // ---------------------------
+  //
+  // ***************************
+
+  __ break_(0x1234);
+
+  // Restore callee saved registers from the stack.
+  __ MultiPop(kCalleeSaved | ra.bit());
+
   // Load a result.
   __ li(v0, Operand(0x1234));
   __ jr(ra);