linux: work around LAHF bug in Flash

chrome/plugin/plugin_main.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "build/build_config.h"
 
 #include "app/hi_res_timer_manager.h"
 #include "app/system_monitor.h"
 #if defined(OS_WIN)
 #include "app/win_util.h"
@@ skipping 21 matching lines @@
 #include "chrome/app/breakpad_linux.h"
 #endif
 
 #if defined(OS_MACOSX)
 // Removes our Carbon library interposing from the environment so that it
 // doesn't carry into any processes that plugins might start.
 void TrimInterposeEnvironment();
 
 // Initializes the global Cocoa application object.
 void InitializeChromeApplication();
-#endif  // OS_MACOSX
+#elif defined(OS_LINUX)
+// Work around an unimplemented instruction in 64-bit Flash.
+void WorkaroundFlashLAHF();
+#endif
 
 // main() routine for running as the plugin process.
 int PluginMain(const MainFunctionParams& parameters) {
 #if defined(USE_LINUX_BREAKPAD)
   // Needs to be called after we have chrome::DIR_USER_DATA.
   InitCrashReporter();
 #endif
 
   // The main thread of the plugin services UI.
 #if defined(OS_MACOSX)
   TrimInterposeEnvironment();
   InitializeChromeApplication();
 #endif
   MessageLoop main_message_loop(MessageLoop::TYPE_UI);
   std::wstring app_name = chrome::kBrowserAppName;
   PlatformThread::SetName(WideToASCII(app_name + L"_PluginMain").c_str());
 
   SystemMonitor system_monitor;
   HighResolutionTimerManager high_resolution_timer_manager;
 
   const CommandLine& parsed_command_line = parameters.command_line_;
 
 #if defined(OS_LINUX)
   // On Linux we exec ourselves from /proc/self/exe, but that makes the
   // process name that shows up in "ps" etc. for plugins show as "exe"
   // instead of "chrome" or something reasonable. Try to fix it.
   CommandLine::SetProcTitle();
+
+#if defined(ARCH_CPU_64_BITS)
+  WorkaroundFlashLAHF();
+#endif
+
 #elif defined(OS_WIN)
   sandbox::TargetServices* target_services =
       parameters.sandbox_info_.TargetServices();
 
   CoInitialize(NULL);
   DLOG(INFO) << "Started plugin with " <<
     parsed_command_line.command_line_string();
 
   HMODULE sandbox_test_module = NULL;
   bool no_sandbox = parsed_command_line.HasSwitch(switches::kNoSandbox) ||
@@ skipping 42 matching lines @@
 
     MessageLoop::current()->Run();
   }
 
 #if defined(OS_WIN)
   CoUninitialize();
 #endif
 
   return 0;
 }