[MIPS] Restore the trusted stack in NaClSyscallSeg.

src/trusted/service_runtime/arch/mips/nacl_switch.S

 /*
- * Copyright 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.
+ * 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.
  */
 
 #include "native_client/src/trusted/service_runtime/arch/mips/sel_rt.h"
 #include "native_client/src/trusted/service_runtime/nacl_config.h"
 
 .text
 
 /*
  * This trusted code is linked into the service_runtime and
  * executed when switching from the service runtime to a nacl
@@ skipping 34 matching lines @@
   addiu   $t7, $t7, %lo(NACL_DATA_FLOW_MASK)
   lw $s0, NACL_THREAD_CONTEXT_OFFSET_S0($a0)
   lw $s1, NACL_THREAD_CONTEXT_OFFSET_S1($a0)
   lw $s2, NACL_THREAD_CONTEXT_OFFSET_S2($a0)
   lw $s3, NACL_THREAD_CONTEXT_OFFSET_S3($a0)
   lw $s4, NACL_THREAD_CONTEXT_OFFSET_S4($a0)
   lw $s5, NACL_THREAD_CONTEXT_OFFSET_S5($a0)
   lw $s6, NACL_THREAD_CONTEXT_OFFSET_S6($a0)
   lw $s7, NACL_THREAD_CONTEXT_OFFSET_S7($a0)
   lw $t8, NACL_THREAD_CONTEXT_OFFSET_T8($a0)
-  lw $gp, NACL_THREAD_CONTEXT_OFFSET_GLOBAL_PTR($a0)
   lw $sp, NACL_THREAD_CONTEXT_OFFSET_STACK_PTR($a0)
   lw $fp, NACL_THREAD_CONTEXT_OFFSET_FRAME_PTR($a0)
 
   /* NACL_CALLEE_SAVE_LIST END*/
 
   lw $v0, NACL_THREAD_CONTEXT_OFFSET_SYSRET($a0)
   lw $v1, NACL_THREAD_CONTEXT_OFFSET_NEW_PROG_CTR($a0)
 
   /* At startup, context->sysret contains not the the return value, but the
      first argument. Put it in a0. */
   addu $a0, $v0, $zero
 
   /* Transfer control to untrusted code */
   jr  $v1
   nop
 
   .set reorder