components/nacl/loader/nonsfi/irt_icache.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #if defined(__arm__)  // nacl_irt_icache is supported only on ARM.
   6
   7 #include <errno.h>
   8 #include <sys/syscall.h>
   9 #include <stddef.h>
  10
  11 #include "components/nacl/loader/nonsfi/irt_interfaces.h"
  12
  13 namespace nacl {
  14 namespace nonsfi {
  15
  16 namespace {
  17
  18 // TODO(mazda): Revisit the implementation to consider inlining the syscall
  19 // with assembly when Non-SFI mode's IRT implementations get moved to the
  20 // NaCl repository.
  21 int IrtClearCache(void* addr, size_t size) {
  22   // The third argument of cacheflush is just ignored for now and should
  23   // always be zero.
  24   int result = syscall(__ARM_NR_cacheflush,
  25                        addr, reinterpret_cast<intptr_t>(addr) + size, 0);
  26   if (result < 0)
  27     return errno;
  28   return 0;
  29 }
  30
  31 }  // namespace
  32
  33 const nacl_irt_icache kIrtIcache = {
  34   IrtClearCache
  35 };
  36
  37 }  // namespace nonsfi
  38 }  // namespace nacl
  39
  40 #endif