Android: Add chrome-specific dynamic linker.

base/android/linker/crazy_linker/src/crazy_linker_library_view.cpp

+// Copyright (c) 2013 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 "crazy_linker_library_view.h"
+
+#include <dlfcn.h>
+#include "crazy_linker_debug.h"
+#include "crazy_linker_globals.h"
+#include "crazy_linker_shared_library.h"
+
+namespace crazy {
+
+LibraryView::~LibraryView() {
+  LOG("%s: Destroying %s\n", __FUNCTION__, name_.c_str());
+  if (type_ == TYPE_SYSTEM) {
+    ::dlclose(system_);
+    system_ = NULL;
+  }
+  if (type_ == TYPE_CRAZY) {
+    delete crazy_;
+    crazy_ = NULL;
+  }
+  type_ = TYPE_NONE;
+}
+
+void* LibraryView::LookupSymbol(const char* symbol_name) {
+  if (type_ == TYPE_SYSTEM)
+    return ::dlsym(system_, symbol_name);
+
+  if (type_ == TYPE_CRAZY) {
+    LibraryList* lib_list = Globals::GetLibraries();
+    return lib_list->FindSymbolFrom(symbol_name, this);
+  }
+
+  return NULL;
+}
+
+bool LibraryView::GetInfo(size_t* load_address,
+                             size_t* load_size,
+                             size_t* relro_start,
+                             size_t* relro_size,
+                             int* relro_fd,
+                             Error* error) {
+  if (type_ != TYPE_CRAZY) {
+    *error = "No RELRO sharing with system libraries";
+    return false;
+  }
+
+  *load_address = crazy_->base;
+  *load_size = crazy_->size;
+  *relro_start = crazy_->relro_start;
+  *relro_size = crazy_->relro_size;
+  *relro_fd = crazy_->relro_fd;
+  return true;
+}
+
+bool LibraryView::EnableSharedRelro(Error* error) {
+  if (type_ != TYPE_CRAZY) {
+    *error = "No RELRO sharing with system libraries";
+    return false;
+  }
+
+  return crazy_->EnableSharedRelro(error);
+}
+
+bool LibraryView::UseSharedRelro(size_t relro_start,
+                                    size_t relro_size,
+                                    int relro_fd,
+                                    Error* error) {
+  if (type_ != TYPE_CRAZY) {
+    *error = "No RELRO sharing with system libraries";
+    return false;
+  }
+
+  // If there is no RELRO segment, don't do anything.
+  if (relro_fd < 0 || relro_size == 0)
+    return true;
+
+  return crazy_->UseSharedRelro(relro_start, relro_size, relro_fd, error);
+}
+
+}  // namespace crazy