[MIPS] Use break instruction as NACL_HALT for MIPS.

src/trusted/service_runtime/nacl_config.h

 /*
  * 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.
  */
 
 /*
  * NaCl Simple/secure ELF loader (NaCl SEL).
  *
  * NOTE: This header is ALSO included by assembler files and hence
@@ skipping 251 matching lines @@
 /* 16-byte bundles, 256MB code segment*/
 # define NACL_CONTROL_FLOW_MASK     0x0FFFFFF0
 # define NACL_DATA_FLOW_MASK        0x3FFFFFFF
 # define NACL_USERRET_FIX           (0x4)
 # define NACL_SYSARGS_FIX           (NACL_USERRET_FIX + 0x4)
 # define NACL_SYSCALLRET_FIX        (NACL_USERRET_FIX + 0x4)
 # define NACL_STACK_ALIGN_MASK      (0x7)
 # define NACL_STACK_GETS_ARG        (0)
 # define NACL_STACK_PAD_BELOW_ALIGN (0)
 # define NACL_STACK_RED_ZONE        (0)
+# define NACL_HALT                  break
 /* 16 byte bundles */
 
 #else /* NACL_ARCH(NACL_BUILD_ARCH) */
 
 # error Unknown platform!
 
 #endif /* NACL_ARCH(NACL_BUILD_ARCH) */
 
 /*
  * Android linker doesn't support __thread variables - for development purposes
  * one could enable using unsafe pthread API for TLS, before real fix based on
  * trusted R9-based TLS pool appears.
  * TODO(olonho): remove when issue
  * http://code.google.com/p/nativeclient/issues/detail?id=2933
  * gets fixed.
  */
 #define NACL_DANGEROUS_USE_PTHREAD_GETSPECIFIC_ON_ANDROID NACL_ANDROID
 
 #endif  /* NATIVE_CLIENT_SRC_TRUSTED_SERVICE_RUNTIME_NACL_CONFIG_H_ */