A mechanism to identify/forbid/"rewrite" non-temporal instructions (and other)

src/trusted/service_runtime/elf_util.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.
  */
 
 /*
  * NaCl helper functions to deal with elf images
  */
 
@@ skipping 630 matching lines @@
       NaClMetadataFromNaClDescCtor(&metadata, ndp);
       CHECK(segment_size == nap->static_text_end - NACL_TRAMPOLINE_END);
       validator_status = NACL_FI_VAL(
           "ELF_LOAD_FORCE_VALIDATION_STATUS",
           enum NaClValidationStatus,
           (*nap->validator->
            Validate)(vaddr,
                      (uint8_t *) image_sys_addr,
                      segment_size,  /* actual size */
                      0,  /* stubout_mode: no */
+                     nap->pnacl_mode ? DISABLE_NONTEMPORALS : 0,
                      1,  /* readonly_text: yes */
                      nap->cpu_features,
                      &metadata,
                      nap->validation_cache));
       NaClPerfCounterMark(&time_mmap_segment, "ValidateMapped");
       NaClPerfCounterIntervalLast(&time_mmap_segment);
       NaClLog(3, "NaClElfFileMapSegment: validator_status %d\n",
               validator_status);
       NaClMetadataDtor(&metadata);
       /*
@@ skipping 361 matching lines @@
 }
 
 void NaClElfImageDelete(struct NaClElfImage *image) {
   free(image);
 }
 
 
 uintptr_t NaClElfImageGetEntryPoint(struct NaClElfImage *image) {
   return image->ehdr.e_entry;
 }