x86 validator: Implement rewriting "movntps" to "movaps" on x86-32

src/trusted/validator_ragel/dfa_validate_common.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.
  */
 
 /* Implement the functions common for ia32 and x86-64 architectures.  */
 #include "native_client/src/trusted/validator_ragel/dfa_validate_common.h"
 
 #include <string.h>
@@ skipping 65 matching lines @@
     return TRUE;
   }
 
 #if NACL_BUILD_SUBARCH == 32
   UNREFERENCED_PARAMETER(info);
 
   if (size >= 2 && memcmp(ptr, "\x0f\xe7", 2) == 0) {
     /* movntq => movq */
     ptr[1] = 0x7f;
     return TRUE;
+  } else if (size >= 2 && memcmp(ptr, "\x0f\x2b", 2) == 0) {
+    /* movntps => movaps */
+    ptr[1] = 0x29;
+    return TRUE;
   } else if (size >= 3 && memcmp(ptr, "\x66\x0f\xe7", 3) == 0) {
     /* movntdq => movdqa */
     ptr[2] = 0x7f;
     return TRUE;
   }
 #elif NACL_BUILD_SUBARCH == 64
   if (size >= 3 && IsREXPrefix(ptr[0]) && ptr[1] == 0x0f) {
     uint8_t opcode_byte2 = ptr[2];
     switch (opcode_byte2) {
       case 0xe7:
@@ skipping 183 matching lines @@
 
 Bool NaClDfaCodeReplacementIsStubouted(const uint8_t *begin_existing,
                                        size_t instruction_length) {
 
   /* Unsupported instruction must have been replaced with HLTs.  */
   if (memcmp(kStubOutMem, begin_existing, instruction_length) == 0)
     return TRUE;
   else
     return FALSE;
 }