[MIPS] Add remaining parts for building tests for MIPS

tests/toolchain/eh_return.c

 /*
  * Copyright (c) 2012 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /* This test is guarding against regressions wrt
     __builtin_eh_return (offset, handler)
     especially for pnacl
     The behavior of this builtin is not seem to be well defined.
     It does not even exist for arm, so we empirically determine
     values for STACK_REMAINDER which make the builtin
     behave like a tail-call for testing.
  */
 #include "native_client/tests/toolchain/eh_helper.h"
 #include "native_client/tests/toolchain/utils.h"
 
 
 void* dummy0_cfa = 0;
 void* return_address = 0;
 
 /* STACK_REMAINDER is to compensate for the
  *  return address slot which is still on the stack on x86.
  */
 #if defined(__arm__)
   #define STACK_REMAINDER 0L
+#elif defined(__mips__)
+  #define STACK_REMAINDER 0L
 #elif defined(__i386__)
   #define STACK_REMAINDER -4L
 #elif defined(__x86_64__)
   #define STACK_REMAINDER -8L
 #else
 #error "unknown arch"
 #endif
 
 /* prevent inlining, especially into main */
 void dummy3() __attribute__((noinline));
@@ skipping 42 matching lines @@
   next_step(2);
   __builtin_eh_return (STACK_REMAINDER, dummy1);
 }
 
 int main(int argc, char* argv[]) {
   next_step(1);
   dummy0();
   /* Should not get here */
   abort();
 }