components/nacl/loader/nonsfi/nonsfi_main.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 #include "components/nacl/loader/nonsfi/nonsfi_main.h"
   6
   7 #include "base/logging.h"
   8 #include "base/threading/platform_thread.h"
   9 #include "base/threading/thread_restrictions.h"
  10 #include "native_client/src/include/elf_auxv.h"
  11
  12 #if defined(OS_NACL_NONSFI)
  13 #include "native_client/src/public/nonsfi/elf_loader.h"
  14 #include "ppapi/nacl_irt/irt_ppapi.h"
  15 #else
  16 #include "base/memory/scoped_ptr.h"
  17 #include "components/nacl/loader/nonsfi/elf_loader.h"
  18 #include "components/nacl/loader/nonsfi/irt_interfaces.h"
  19 #include "native_client/src/include/nacl_macros.h"
  20 #include "native_client/src/public/nacl_desc.h"
  21 #include "native_client/src/trusted/service_runtime/include/sys/fcntl.h"
  22 #endif
  23
  24 namespace nacl {
  25 namespace nonsfi {
  26 namespace {
  27
  28 typedef void (*EntryPointType)(uintptr_t*);
  29
  30 class PluginMainDelegate : public base::PlatformThread::Delegate {
  31  public:
  32   explicit PluginMainDelegate(EntryPointType entry_point)
  33       : entry_point_(entry_point) {
  34   }
  35
  36   ~PluginMainDelegate() override {}
  37
  38   void ThreadMain() override {
  39     base::PlatformThread::SetName("NaClMainThread");
  40
  41     // This will only happen once per process, so we give the permission to
  42     // create Singletons.
  43     base::ThreadRestrictions::SetSingletonAllowed(true);
  44     uintptr_t info[] = {
  45       0,  // Do not use fini.
  46       0,  // envc.
  47       0,  // argc.
  48       0,  // Null terminate for argv.
  49       0,  // Null terminate for envv.
  50       AT_SYSINFO,
  51 #if defined(OS_NACL_NONSFI)
  52       reinterpret_cast<uintptr_t>(&chrome_irt_query),
  53 #else
  54       reinterpret_cast<uintptr_t>(&NaClIrtInterface),
  55 #endif
  56       AT_NULL,
  57       0,  // Null terminate for auxv.
  58     };
  59     entry_point_(info);
  60   }
  61
  62  private:
  63   EntryPointType entry_point_;
  64 };
  65
  66 // Default stack size of the plugin main thread. We heuristically chose 16M.
  67 const size_t kStackSize = (16 << 20);
  68
  69 #if !defined(OS_NACL_NONSFI)
  70 struct NaClDescUnrefer {
  71   void operator()(struct NaClDesc* desc) const {
  72     NaClDescUnref(desc);
  73   }
  74 };
  75 #endif
  76
  77 }  // namespace
  78
  79 void MainStart(int nexe_file) {
  80 #if defined(OS_NACL_NONSFI)
  81   EntryPointType entry_point =
  82       reinterpret_cast<EntryPointType>(NaClLoadElfFile(nexe_file));
  83 #else
  84   ::scoped_ptr<struct NaClDesc, NaClDescUnrefer> desc(
  85        NaClDescIoMakeFromHandle(nexe_file, NACL_ABI_O_RDONLY));
  86   ElfImage image;
  87   if (image.Read(desc.get()) != LOAD_OK) {
  88     LOG(ERROR) << "LoadModuleRpc: Failed to read binary.";
  89     return;
  90   }
  91
  92   if (image.Load(desc.get()) != LOAD_OK) {
  93     LOG(ERROR) << "LoadModuleRpc: Failed to load the image";
  94     return;
  95   }
  96
  97   EntryPointType entry_point =
  98       reinterpret_cast<EntryPointType>(image.entry_point());
  99 #endif
 100   if (!base::PlatformThread::CreateNonJoinable(
 101           kStackSize, new PluginMainDelegate(entry_point))) {
 102     LOG(ERROR) << "LoadModuleRpc: Failed to create plugin main thread.";
 103     return;
 104   }
 105 }
 106
 107 }  // namespace nonsfi
 108 }  // namespace nacl