MIPS port initial commit

src/platform-linux.cc

Index: src/platform-linux.cc
===================================================================
--- src/platform-linux.cc	(revision 3798)
+++ src/platform-linux.cc	(working copy)
@@ -151,11 +151,12 @@
   // On EABI ARM targets this is required for fp correctness in the
   // runtime system.
   return 8;
-#else
+#elif V8_TARGET_ARCH_MIPS
+  return 8;
+#endif
   // With gcc 4.4 the tree vectorization optimiser can generate code
   // that requires 16 byte alignment such as movdqa on x86.
   return 16;
-#endif
 }
 
 
@@ -262,6 +263,8 @@
 //  which is the architecture of generated code).
 #if defined(__arm__) || defined(__thumb__)
   asm("bkpt 0");
+#elif defined(__mips__)
+  asm("break");
 #else
   asm("int $3");
 #endif
@@ -713,6 +716,7 @@
 
 
 static void ProfilerSignalHandler(int signal, siginfo_t* info, void* context) {
+#ifndef V8_HOST_ARCH_MIPS
   USE(info);
   if (signal != SIGPROF) return;
   if (active_sampler_ == NULL) return;
@@ -743,6 +747,9 @@
     sample.sp = reinterpret_cast<Address>(mcontext.arm_sp);
     sample.fp = reinterpret_cast<Address>(mcontext.arm_fp);
 #endif
+#elif V8_HOST_ARCH_MIPS
+    // Implement this on MIPS.
+    UNIMPLEMENTED();
 #endif
     if (IsVmThread())
       active_sampler_->SampleStack(&sample);
@@ -752,6 +759,7 @@
   sample.state = Logger::state();
 
   active_sampler_->Tick(&sample);
+#endif
 }