NaCl-Chrome integration

chrome/nacl/sel_main.cc

+// Copyright (c) 2006-2009 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 "native_client/src/include/portability.h"
+
+#if NACL_OSX
+#include <crt_externs.h>
+#endif
+
+EXTERN_C_BEGIN
+#include "native_client/src/shared/platform/nacl_sync.h"
+#include "native_client/src/shared/platform/nacl_sync_checked.h"
+#include "native_client/src/trusted/service_runtime/nacl_globals.h"
+#include "native_client/src/trusted/service_runtime/expiration.h"
+#include "native_client/src/trusted/service_runtime/nacl_app.h"
+#include "native_client/src/trusted/service_runtime/nacl_all_modules.h"
+#include "native_client/src/trusted/service_runtime/sel_ldr.h"
+#include "native_client/src/trusted/platform_qualify/nacl_os_qualify.h"
+EXTERN_C_END
+
+int verbosity = 0;
+
+#ifdef __GNUC__
+
+/*
+ * GDB's canonical overlay managment routine.
+ * We need its symbol in the symbol table so don't inline it.
+ * TODO(dje): add some explanation for the non-GDB person.
+ */
+
+static void __attribute__ ((noinline)) _ovly_debug_event (void) {
+  /*
+   * The asm volatile is here as instructed by the GCC docs.
+   * It's not enough to declare a function noinline.
+   * GCC will still look inside the function to see if it's worth calling.
+   */
+  asm volatile ("");
+}
+
+#endif
+
+static void StopForDebuggerInit (const struct NaClApp *state) {
+  /* Put xlate_base in a place where gdb can find it.  */
+  nacl_global_xlate_base = state->xlate_base;
+
+#ifdef __GNUC__
+  _ovly_debug_event ();
+#endif
+}
+
+int SelMain(const int desc, const NaClHandle handle) {
+  char *av[1];
+  int ac = 1;
+
+  char                          **envp;
+  struct NaClApp                state;
+  char                          *nacl_file = 0;
+  int                           main_thread_only = 1;
+  int                           export_addr_to = -2;
+
+  struct NaClApp                *nap;
+
+  NaClErrorCode                 errcode;
+
+  int                           ret_code = 1;
+#if NACL_OSX
+  // Mac dynamic libraries cannot access the environ variable directly.
+  envp = *_NSGetEnviron();
+#else
+  extern char                   **environ;
+  envp = environ;
+#endif
+
+
+  if (NaClHasExpired()) {
+    // TODO(gregoryd): report error to browser?
+    fprintf(stderr, "This version of Native Client has expired.\n");
+    fprintf(stderr, "Please visit: http://code.google.com/p/nativeclient/\n");
+    exit(-1);
+  }
+
+  NaClAllModulesInit();
+
+  /* used to be -P */
+  NaClSrpcFileDescriptor = desc;
+  /* used to be -X */
+  export_addr_to = desc;
+
+  /* to be passed to NaClMain, eventually... */
+  av[0] = const_cast<char*>("NaClMain");
+
+  if (!NaClAppCtor(&state)) {
+    fprintf(stderr, "Error while constructing app state\n");
+    goto done_file_dtor;
+  }
+
+  state.restrict_to_main_thread = main_thread_only;
+
+  nap = &state;
+  errcode = LOAD_OK;
+
+  /* import IMC handle - used to be "-i" */
+  NaClAddImcHandle(nap, handle, desc);
+
+  /*
+   * in order to report load error to the browser plugin through the
+   * secure command channel, we do not immediate jump to cleanup code
+   * on error.  rather, we continue processing (assuming earlier
+   * errors do not make it inappropriate) until the secure command
+   * channel is set up, and then bail out.
+   */
+
+  /*
+   * Ensure this operating system platform is supported.
+   */
+  if (!NaClOsIsSupported()) {
+    errcode = LOAD_UNSUPPORTED_OS_PLATFORM;
+    nap->module_load_status = errcode;
+    fprintf(stderr, "Error while loading \"%s\": %s\n",
+            nacl_file,
+            NaClErrorString(errcode));
+  }
+
+  /* Give debuggers a well known point at which xlate_base is known.  */
+  StopForDebuggerInit(&state);
+
+  /*
+   * If export_addr_to is set to a non-negative integer, we create a
+   * bound socket and socket address pair and bind the former to
+   * descriptor 3 and the latter to descriptor 4.  The socket address
+   * is written out to the export_addr_to descriptor.
+   *
+   * The service runtime also accepts a connection on the bound socket
+   * and spawns a secure command channel thread to service it.
+   *
+   * If export_addr_to is -1, we only create the bound socket and
+   * socket address pair, and we do not export to an IMC socket.  This
+   * use case is typically only used in testing, where we only "dump"
+   * the socket address to stdout or similar channel.
+   */
+  if (-2 < export_addr_to) {
+    NaClCreateServiceSocket(nap);
+    if (0 <= export_addr_to) {
+      NaClSendServiceAddressTo(nap, export_addr_to);
+      /*
+       * NB: spawns a thread that uses the command channel.  we do
+       * this after NaClAppLoadFile so that NaClApp object is more
+       * fully populated.  Hereafter any changes to nap should be done
+       * while holding locks.
+       */
+      NaClSecureCommandChannel(nap);
+    }
+  }
+
+  NaClXMutexLock(&nap->mu);
+  nap->module_load_status = LOAD_OK;
+  NaClXCondVarBroadcast(&nap->cv);
+  NaClXMutexUnlock(&nap->mu);
+
+  if (NULL != nap->secure_channel) {
+    /*
+     * wait for start_module RPC call on secure channel thread.
+     */
+    NaClWaitForModuleStartStatusCall(nap);
+  }
+
+  /*
+   * error reporting done; can quit now if there was an error earlier.
+   */
+  if (LOAD_OK != errcode) {
+    goto done;
+  }
+
+  /*
+   * only nap->ehdrs.e_entry is usable, no symbol table is
+   * available.
+   */
+  if (!NaClCreateMainThread(nap,
+                            ac,
+                            av,
+                            envp)) {
+    fprintf(stderr, "creating main thread failed\n");
+    goto done;
+  }
+
+  ret_code = NaClWaitForMainThreadToExit(nap);
+
+  /*
+   * exit_group or equiv kills any still running threads while module
+   * addr space is still valid.  otherwise we'd have to kill threads
+   * before we clean up the address space.
+   */
+  return ret_code;
+
+ done:
+  fflush(stdout);
+
+  NaClAppDtor(&state);
+
+ done_file_dtor:
+  fflush(stdout);
+
+  NaClAllModulesFini();
+
+  return ret_code;
+}
+