[MIPS] New pattern in validator to detect jumps/branches in delay slots.

src/trusted/validator_mips/validation-report.py

 #!/usr/bin/python
 #
 # 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.
 #
 
 import sys
 import os
 import textwrap
@@ skipping 55 matching lines @@
             ' caller will not return to the next instruction (start of next '
             'bundle)',
             0, 0],
         'kProblemUnalignedJumpToTrampoline':['The destination of this '
             'jump/branch instruction is in trampoline code section but '
             'address is not bundle aligned',
             0, 0],
         'kProblemDataRegInDelaySlot':['This instruction changes value of a '
             'stack pointer but is located in the delay slot of jump/branch',
             1, 0],
+        'kProblemBranchInDelaySlot':['This instruction is a jump/branch '
+            'instruction and it is located in a delay slot of the previous '
+            'jump/branch instruction',
+            1, 0],
+
     }[code]
 
 
 def _safety_msg(val):
     return {
         0: 'UNKNOWN',  # Should not appear
         1: 'is undefined',
         2: 'has unpredictable effects',
         3: 'is deprecated',
         4: 'is forbidden',
@@ skipping 29 matching lines @@
         return 1
     for line in sys.stdin:
         if line.startswith('ncval: '):
             line = line[7:].strip()
             _explain_problem(sys.argv[1], *_parse_report(line))
     return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))