7 files changed, 823 insertions, 0 deletions
diff --git a/mozglue/android/APKOpen.cpp b/mozglue/android/APKOpen.cpp
new file mode 100644
index 0000000000..9f41ca7bd2
--- /dev/null
+++ b/mozglue/android/APKOpen.cpp
@@ -0,0 +1,552 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * This custom library loading code is only meant to be called
+ * during initialization. As a result, it takes no special
+ * precautions to be threadsafe. Any of the library loading functions
+ * like mozload should not be available to other code.
+ */
+
+#include <jni.h>
+#include <android/log.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <sys/limits.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <zlib.h>
+#include "dlfcn.h"
+#include "APKOpen.h"
+#include <sys/time.h>
+#include <sys/syscall.h>
+#include <sys/resource.h>
+#include <sys/prctl.h>
+#include "sqlite3.h"
+#include "Linker.h"
+#include "BaseProfiler.h"
+#include "application.ini.h"
+
+#include "mozilla/arm.h"
+#include "mozilla/Bootstrap.h"
+#include "mozilla/Printf.h"
+#include "mozilla/Sprintf.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/Try.h"
+#include "mozilla/UniquePtr.h"
+#include "XREChildData.h"
+
+/* Android headers don't define RUSAGE_THREAD */
+#ifndef RUSAGE_THREAD
+#  define RUSAGE_THREAD 1
+#endif
+
+#ifndef RELEASE_OR_BETA
+/* Official builds have the debuggable flag set to false, which disables
+ * the backtrace dumper from bionic. However, as it is useful for native
+ * crashes happening before the crash reporter is registered, re-enable
+ * it on non release builds (i.e. nightly and aurora).
+ * Using a constructor so that it is re-enabled as soon as libmozglue.so
+ * is loaded.
+ */
+__attribute__((constructor)) void make_dumpable() { prctl(PR_SET_DUMPABLE, 1); }
+#endif
+
+typedef int mozglueresult;
+
+using LoadGeckoLibsResult =
+    mozilla::Result<mozilla::Ok, mozilla::BootstrapError>;
+
+enum StartupEvent {
+#define mozilla_StartupTimeline_Event(ev, z) ev,
+#include "StartupTimeline.h"
+#undef mozilla_StartupTimeline_Event
+  MAX_STARTUP_EVENT_ID
+};
+
+using namespace mozilla;
+
+void JNI_Throw(JNIEnv* jenv, const char* classname, const char* msg) {
+  __android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Throw\n");
+  jclass cls = jenv->FindClass(classname);
+  if (cls == nullptr) {
+    __android_log_print(
+        ANDROID_LOG_ERROR, "GeckoLibLoad",
+        "Couldn't find exception class (or exception pending) %s\n", classname);
+    exit(FAILURE);
+  }
+  int rc = jenv->ThrowNew(cls, msg);
+  if (rc < 0) {
+    __android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad",
+                        "Error throwing exception %s\n", msg);
+    exit(FAILURE);
+  }
+  jenv->DeleteLocalRef(cls);
+}
+
+namespace {
+JavaVM* sJavaVM;
+}
+
+void abortThroughJava(const char* msg) {
+  struct sigaction sigact = {};
+  if (__wrap_sigaction(SIGSEGV, nullptr, &sigact)) {
+    return;  // sigaction call failed.
+  }
+
+  Dl_info info = {};
+  if ((sigact.sa_flags & SA_SIGINFO) &&
+      __wrap_dladdr(reinterpret_cast<void*>(sigact.sa_sigaction), &info) &&
+      info.dli_fname && strstr(info.dli_fname, "libxul.so")) {
+    return;  // Existing signal handler is in libxul (i.e. we have crash
+             // reporter).
+  }
+
+  JNIEnv* env = nullptr;
+  if (!sJavaVM ||
+      sJavaVM->AttachCurrentThreadAsDaemon(&env, nullptr) != JNI_OK) {
+    return;
+  }
+
+  if (!env || env->PushLocalFrame(2) != JNI_OK) {
+    return;
+  }
+
+  jclass loader = env->FindClass("org/mozilla/gecko/mozglue/GeckoLoader");
+  if (!loader) {
+    return;
+  }
+
+  jmethodID method =
+      env->GetStaticMethodID(loader, "abort", "(Ljava/lang/String;)V");
+  jstring str = env->NewStringUTF(msg);
+
+  if (method && str) {
+    env->CallStaticVoidMethod(loader, method, str);
+  }
+
+  env->PopLocalFrame(nullptr);
+}
+
+Bootstrap::UniquePtr gBootstrap;
+#ifndef MOZ_FOLD_LIBS
+static void* sqlite_handle = nullptr;
+static void* nspr_handle = nullptr;
+static void* plc_handle = nullptr;
+#else
+#  define sqlite_handle nss_handle
+#  define nspr_handle nss_handle
+#  define plc_handle nss_handle
+#endif
+static void* nss_handle = nullptr;
+
+static UniquePtr<char[]> getUnpackedLibraryName(const char* libraryName) {
+  static const char* libdir = getenv("MOZ_ANDROID_LIBDIR");
+
+  size_t len = strlen(libdir) + 1 /* path separator */ + strlen(libraryName) +
+               1; /* null terminator */
+  auto file = MakeUnique<char[]>(len);
+  snprintf(file.get(), len, "%s/%s", libdir, libraryName);
+  return file;
+}
+
+static void* dlopenLibrary(const char* libraryName) {
+  return __wrap_dlopen(getUnpackedLibraryName(libraryName).get(),
+                       RTLD_GLOBAL | RTLD_LAZY);
+}
+
+static void EnsureBaseProfilerInitialized() {
+  // There is no single entry-point into C++ code on Android.
+  // Instead, GeckoThread and GeckoLibLoader call various functions to load
+  // libraries one-by-one.
+  // We want to capture all that library loading in the profiler, so we need to
+  // kick off the base profiler at the beginning of whichever function is called
+  // first.
+  // We currently assume that all these functions are called on the same thread.
+  static bool sInitialized = false;
+  if (sInitialized) {
+    return;
+  }
+
+  // The stack depth we observe here will be determined by the stack of
+  // whichever caller enters this code first. In practice this means that we may
+  // miss some root-most frames, which hopefully shouldn't ruin profiling.
+  int stackBase = 5;
+  mozilla::baseprofiler::profiler_init(&stackBase);
+  sInitialized = true;
+}
+
+static LoadGeckoLibsResult loadGeckoLibs() {
+  TimeStamp t0 = TimeStamp::Now();
+  struct rusage usage1_thread, usage1;
+  getrusage(RUSAGE_THREAD, &usage1_thread);
+  getrusage(RUSAGE_SELF, &usage1);
+
+  static const char* libxul = getenv("MOZ_ANDROID_LIBDIR_OVERRIDE");
+  MOZ_TRY_VAR(
+      gBootstrap,
+      GetBootstrap(libxul ? libxul : getUnpackedLibraryName("libxul.so").get(),
+                   LibLoadingStrategy::ReadAhead));
+
+  TimeStamp t1 = TimeStamp::Now();
+  struct rusage usage2_thread, usage2;
+  getrusage(RUSAGE_THREAD, &usage2_thread);
+  getrusage(RUSAGE_SELF, &usage2);
+
+#define RUSAGE_TIMEDIFF(u1, u2, field)                    \
+  ((u2.ru_##field.tv_sec - u1.ru_##field.tv_sec) * 1000 + \
+   (u2.ru_##field.tv_usec - u1.ru_##field.tv_usec) / 1000)
+
+  __android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad",
+                      "Loaded libs in %fms total, %ldms(%ldms) user, "
+                      "%ldms(%ldms) system, %ld(%ld) faults",
+                      (t1 - t0).ToMilliseconds(),
+                      RUSAGE_TIMEDIFF(usage1_thread, usage2_thread, utime),
+                      RUSAGE_TIMEDIFF(usage1, usage2, utime),
+                      RUSAGE_TIMEDIFF(usage1_thread, usage2_thread, stime),
+                      RUSAGE_TIMEDIFF(usage1, usage2, stime),
+                      usage2_thread.ru_majflt - usage1_thread.ru_majflt,
+                      usage2.ru_majflt - usage1.ru_majflt);
+
+  gBootstrap->XRE_StartupTimelineRecord(LINKER_INITIALIZED, t0);
+  gBootstrap->XRE_StartupTimelineRecord(LIBRARIES_LOADED, t1);
+  return Ok();
+}
+
+static mozglueresult loadNSSLibs();
+
+static mozglueresult loadSQLiteLibs() {
+  if (sqlite_handle) return SUCCESS;
+
+#ifdef MOZ_FOLD_LIBS
+  if (loadNSSLibs() != SUCCESS) return FAILURE;
+#else
+
+  sqlite_handle = dlopenLibrary("libmozsqlite3.so");
+  if (!sqlite_handle) {
+    __android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad",
+                        "Couldn't get a handle to libmozsqlite3!");
+    return FAILURE;
+  }
+#endif
+
+  return SUCCESS;
+}
+
+static mozglueresult loadNSSLibs() {
+  if (nss_handle && nspr_handle && plc_handle) return SUCCESS;
+
+  nss_handle = dlopenLibrary("libnss3.so");
+
+#ifndef MOZ_FOLD_LIBS
+  nspr_handle = dlopenLibrary("libnspr4.so");
+
+  plc_handle = dlopenLibrary("libplc4.so");
+#endif
+
+  if (!nss_handle) {
+    __android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad",
+                        "Couldn't get a handle to libnss3!");
+    return FAILURE;
+  }
+
+#ifndef MOZ_FOLD_LIBS
+  if (!nspr_handle) {
+    __android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad",
+                        "Couldn't get a handle to libnspr4!");
+    return FAILURE;
+  }
+
+  if (!plc_handle) {
+    __android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad",
+                        "Couldn't get a handle to libplc4!");
+    return FAILURE;
+  }
+#endif
+
+  return SUCCESS;
+}
+
+extern "C" APKOPEN_EXPORT void MOZ_JNICALL
+Java_org_mozilla_gecko_mozglue_GeckoLoader_loadGeckoLibsNative(
+    JNIEnv* jenv, jclass jGeckoAppShellClass) {
+  EnsureBaseProfilerInitialized();
+
+  jenv->GetJavaVM(&sJavaVM);
+
+  LoadGeckoLibsResult res = loadGeckoLibs();
+  if (res.isOk()) {
+    return;
+  }
+
+  const BootstrapError& errorInfo = res.inspectErr();
+
+  auto msg = errorInfo.match(
+      [](const nsresult& aRv) {
+        return Smprintf("Error loading Gecko libraries: nsresult 0x%08X",
+                        uint32_t(aRv));
+      },
+      [](const DLErrorType& aErr) {
+        return Smprintf("Error loading Gecko libraries: %s", aErr.get());
+      });
+
+  JNI_Throw(jenv, "java/lang/Exception", msg.get());
+}
+
+extern "C" APKOPEN_EXPORT void MOZ_JNICALL
+Java_org_mozilla_gecko_mozglue_GeckoLoader_loadSQLiteLibsNative(
+    JNIEnv* jenv, jclass jGeckoAppShellClass) {
+  EnsureBaseProfilerInitialized();
+
+  __android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Load sqlite start\n");
+  mozglueresult rv = loadSQLiteLibs();
+  if (rv != SUCCESS) {
+    JNI_Throw(jenv, "java/lang/Exception", "Error loading sqlite libraries");
+  }
+  __android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Load sqlite done\n");
+}
+
+extern "C" APKOPEN_EXPORT void MOZ_JNICALL
+Java_org_mozilla_gecko_mozglue_GeckoLoader_loadNSSLibsNative(
+    JNIEnv* jenv, jclass jGeckoAppShellClass) {
+  EnsureBaseProfilerInitialized();
+
+  __android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Load nss start\n");
+  mozglueresult rv = loadNSSLibs();
+  if (rv != SUCCESS) {
+    JNI_Throw(jenv, "java/lang/Exception", "Error loading nss libraries");
+  }
+  __android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Load nss done\n");
+}
+
+static char** CreateArgvFromObjectArray(JNIEnv* jenv, jobjectArray jargs,
+                                        int* length) {
+  size_t stringCount = jenv->GetArrayLength(jargs);
+
+  if (length) {
+    *length = stringCount;
+  }
+
+  if (!stringCount) {
+    return nullptr;
+  }
+
+  char** argv = new char*[stringCount + 1];
+
+  argv[stringCount] = nullptr;
+
+  for (size_t ix = 0; ix < stringCount; ix++) {
+    jstring string = (jstring)(jenv->GetObjectArrayElement(jargs, ix));
+    const char* rawString = jenv->GetStringUTFChars(string, nullptr);
+    const int strLength = jenv->GetStringUTFLength(string);
+    argv[ix] = strndup(rawString, strLength);
+    jenv->ReleaseStringUTFChars(string, rawString);
+    jenv->DeleteLocalRef(string);
+  }
+
+  return argv;
+}
+
+static void FreeArgv(char** argv, int argc) {
+  for (int ix = 0; ix < argc; ix++) {
+    // String was allocated with strndup, so need to use free to deallocate.
+    free(argv[ix]);
+  }
+  delete[] (argv);
+}
+
+extern "C" APKOPEN_EXPORT void MOZ_JNICALL
+Java_org_mozilla_gecko_mozglue_GeckoLoader_nativeRun(
+    JNIEnv* jenv, jclass jc, jobjectArray jargs, int prefsFd, int prefMapFd,
+    int ipcFd, int crashFd, bool xpcshell, jstring outFilePath) {
+  EnsureBaseProfilerInitialized();
+
+  int argc = 0;
+  char** argv = CreateArgvFromObjectArray(jenv, jargs, &argc);
+
+  if (ipcFd < 0) {
+    if (gBootstrap == nullptr) {
+      FreeArgv(argv, argc);
+      return;
+    }
+
+#ifdef MOZ_LINKER
+    ElfLoader::Singleton.ExpectShutdown(false);
+#endif
+    const char* outFilePathRaw = nullptr;
+    if (xpcshell) {
+      MOZ_ASSERT(outFilePath);
+      outFilePathRaw = jenv->GetStringUTFChars(outFilePath, nullptr);
+    }
+    gBootstrap->GeckoStart(jenv, argv, argc, sAppData, xpcshell,
+                           outFilePathRaw);
+    if (outFilePathRaw) {
+      jenv->ReleaseStringUTFChars(outFilePath, outFilePathRaw);
+    }
+#ifdef MOZ_LINKER
+    ElfLoader::Singleton.ExpectShutdown(true);
+#endif
+  } else {
+    gBootstrap->XRE_SetAndroidChildFds(jenv,
+                                       {prefsFd, prefMapFd, ipcFd, crashFd});
+    gBootstrap->XRE_SetProcessType(argv[argc - 1]);
+
+    XREChildData childData;
+    gBootstrap->XRE_InitChildProcess(argc - 1, argv, &childData);
+  }
+
+#ifdef MOZ_WIDGET_ANDROID
+#  ifdef MOZ_PROFILE_GENERATE
+  gBootstrap->XRE_WriteLLVMProfData();
+#  endif
+#endif
+  gBootstrap.reset();
+  FreeArgv(argv, argc);
+}
+
+extern "C" APKOPEN_EXPORT mozglueresult ChildProcessInit(int argc,
+                                                         char* argv[]) {
+  EnsureBaseProfilerInitialized();
+
+  if (loadNSSLibs() != SUCCESS) {
+    return FAILURE;
+  }
+  if (loadSQLiteLibs() != SUCCESS) {
+    return FAILURE;
+  }
+  if (loadGeckoLibs().isErr()) {
+    return FAILURE;
+  }
+
+  gBootstrap->XRE_SetProcessType(argv[--argc]);
+
+  XREChildData childData;
+  return NS_FAILED(gBootstrap->XRE_InitChildProcess(argc, argv, &childData));
+}
+
+// Does current process name end with ':media'?
+static bool IsMediaProcess() {
+  pid_t pid = getpid();
+  char str[256];
+  SprintfLiteral(str, "/proc/%d/cmdline", pid);
+  FILE* f = fopen(str, "r");
+  if (f) {
+    fgets(str, sizeof(str), f);
+    fclose(f);
+    const size_t strLen = strlen(str);
+    const char suffix[] = ":media";
+    const size_t suffixLen = sizeof(suffix) - 1;
+    if (strLen >= suffixLen &&
+        !strncmp(str + strLen - suffixLen, suffix, suffixLen)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+#ifndef SYS_rt_tgsigqueueinfo
+#  define SYS_rt_tgsigqueueinfo __NR_rt_tgsigqueueinfo
+#endif
+/* Copy of http://androidxref.com/7.1.1_r6/xref/bionic/linker/debugger.cpp#262,
+ * with debuggerd related code stripped.
+ *
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+static void CatchFatalSignals(int num, siginfo_t* info, void* context) {
+  // It's possible somebody cleared the SA_SIGINFO flag, which would mean
+  // our "info" arg holds an undefined value.
+  struct sigaction action = {};
+  if ((sigaction(num, nullptr, &action) < 0) ||
+      !(action.sa_flags & SA_SIGINFO)) {
+    info = nullptr;
+  }
+
+  // We need to return from the signal handler so that debuggerd can dump the
+  // thread that crashed, but returning here does not guarantee that the signal
+  // will be thrown again, even for SIGSEGV and friends, since the signal could
+  // have been sent manually. Resend the signal with rt_tgsigqueueinfo(2) to
+  // preserve the SA_SIGINFO contents.
+  signal(num, SIG_DFL);
+
+  struct siginfo si;
+  if (!info) {
+    memset(&si, 0, sizeof(si));
+    si.si_code = SI_USER;
+    si.si_pid = getpid();
+    si.si_uid = getuid();
+    info = &si;
+  } else if (info->si_code >= 0 || info->si_code == SI_TKILL) {
+    // rt_tgsigqueueinfo(2)'s documentation appears to be incorrect on kernels
+    // that contain commit 66dd34a (3.9+). The manpage claims to only allow
+    // negative si_code values that are not SI_TKILL, but 66dd34a changed the
+    // check to allow all si_code values in calls coming from inside the house.
+  }
+
+  int rc = syscall(SYS_rt_tgsigqueueinfo, getpid(), gettid(), num, info);
+  if (rc != 0) {
+    __android_log_print(ANDROID_LOG_FATAL, "mozglue",
+                        "failed to resend signal during crash: %s",
+                        strerror(errno));
+    _exit(0);
+  }
+}
+
+extern "C" APKOPEN_EXPORT void MOZ_JNICALL
+Java_org_mozilla_gecko_mozglue_GeckoLoader_suppressCrashDialog(JNIEnv* jenv,
+                                                               jclass jc) {
+  MOZ_RELEASE_ASSERT(IsMediaProcess(),
+                     "Suppress crash dialog only for media process");
+  // Restoring to SIG_DFL will crash on x86/Android M devices (see bug 1374556)
+  // so copy Android code
+  // (http://androidxref.com/7.1.1_r6/xref/bionic/linker/debugger.cpp#302). See
+  // comments above CatchFatalSignals() for copyright notice.
+  struct sigaction action;
+  memset(&action, 0, sizeof(action));
+  sigemptyset(&action.sa_mask);
+  action.sa_sigaction = &CatchFatalSignals;
+  action.sa_flags = SA_RESTART | SA_SIGINFO;
+
+  // Use the alternate signal stack if available so we can catch stack
+  // overflows.
+  action.sa_flags |= SA_ONSTACK;
+
+  sigaction(SIGABRT, &action, nullptr);
+  sigaction(SIGBUS, &action, nullptr);
+  sigaction(SIGFPE, &action, nullptr);
+  sigaction(SIGILL, &action, nullptr);
+  sigaction(SIGSEGV, &action, nullptr);
+#if defined(SIGSTKFLT)
+  sigaction(SIGSTKFLT, &action, nullptr);
+#endif
+  sigaction(SIGTRAP, &action, nullptr);
+}
diff --git a/mozglue/android/APKOpen.h b/mozglue/android/APKOpen.h
new file mode 100644
index 0000000000..f3666bf028
--- /dev/null
+++ b/mozglue/android/APKOpen.h
@@ -0,0 +1,29 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef APKOpen_h
+#define APKOpen_h
+
+#include <jni.h>
+
+#ifndef APKOPEN_EXPORT
+#  define APKOPEN_EXPORT __attribute__((visibility("default")))
+#endif
+
+APKOPEN_EXPORT void abortThroughJava(const char* msg);
+
+static const int SUCCESS = 0;
+static const int FAILURE = 1;
+void JNI_Throw(JNIEnv* jenv, const char* classname, const char* msg);
+
+// Bug 1207642 - Work around Dalvik bug by realigning stack on JNI entry
+#ifndef MOZ_JNICALL
+#  ifdef __i386__
+#    define MOZ_JNICALL JNICALL __attribute__((force_align_arg_pointer))
+#  else
+#    define MOZ_JNICALL JNICALL
+#  endif
+#endif
+
+#endif /* APKOpen_h */
diff --git a/mozglue/android/Ashmem.cpp b/mozglue/android/Ashmem.cpp
new file mode 100644
index 0000000000..edfeb495dd
--- /dev/null
+++ b/mozglue/android/Ashmem.cpp
@@ -0,0 +1,73 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <cstring>
+#include <dlfcn.h>
+#include <fcntl.h>
+#include <linux/ashmem.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#include "Ashmem.h"
+
+namespace mozilla {
+namespace android {
+
+static void* libhandle() {
+  static void* handle = dlopen("libandroid.so", RTLD_LAZY | RTLD_LOCAL);
+  return handle;
+}
+
+int ashmem_create(const char* name, size_t size) {
+  static auto fCreate =
+      (int (*)(const char*, size_t))dlsym(libhandle(), "ASharedMemory_create");
+
+  if (fCreate) {
+    return fCreate(name, size);
+  }
+
+  int fd = open("/" ASHMEM_NAME_DEF, O_RDWR);
+  if (fd < 0) {
+    return fd;
+  }
+
+  if (name) {
+    char str[ASHMEM_NAME_LEN];
+    strlcpy(str, name, sizeof(str));
+    ioctl(fd, ASHMEM_SET_NAME, str);
+  }
+
+  if (ioctl(fd, ASHMEM_SET_SIZE, size) != 0) {
+    close(fd);
+    return -1;
+  }
+
+  return fd;
+}
+
+size_t ashmem_getSize(int fd) {
+  static auto fGetSize =
+      (size_t(*)(int))dlsym(libhandle(), "ASharedMemory_getSize");
+  if (fGetSize) {
+    return fGetSize(fd);
+  }
+
+  return (size_t)ioctl(fd, ASHMEM_GET_SIZE, nullptr);
+}
+
+int ashmem_setProt(int fd, int prot) {
+  static auto fSetProt =
+      (int (*)(int, int))dlsym(libhandle(), "ASharedMemory_setProt");
+  if (fSetProt) {
+    return fSetProt(fd, prot);
+  }
+
+  return ioctl(fd, ASHMEM_SET_PROT_MASK, prot);
+}
+
+}  // namespace android
+}  // namespace mozilla
diff --git a/mozglue/android/Ashmem.h b/mozglue/android/Ashmem.h
new file mode 100644
index 0000000000..3307761e32
--- /dev/null
+++ b/mozglue/android/Ashmem.h
@@ -0,0 +1,23 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef Ashmem_h__
+#define Ashmem_h__
+
+#include <linux/ashmem.h>
+#include "mozilla/Types.h"
+
+namespace mozilla {
+namespace android {
+
+// Wrappers for the ASharedMemory function in the NDK
+// https://developer.android.com/ndk/reference/group/memory
+MFBT_API int ashmem_create(const char* name, size_t size);
+MFBT_API size_t ashmem_getSize(int fd);
+MFBT_API int ashmem_setProt(int fd, int prot);
+
+}  // namespace android
+}  // namespace mozilla
+
+#endif  // Ashmem_h__
diff --git a/mozglue/android/SharedMemNatives.cpp b/mozglue/android/SharedMemNatives.cpp
new file mode 100644
index 0000000000..f38a2274b3
--- /dev/null
+++ b/mozglue/android/SharedMemNatives.cpp
@@ -0,0 +1,80 @@
+/* -*- Mode: c++; c-basic-offset: 2; tab-width: 20; indent-tabs-mode: nil; -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <errno.h>
+#include <jni.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/mman.h>
+
+#include "mozilla/Sprintf.h"
+
+extern "C" {
+
+JNIEXPORT
+void JNICALL
+Java_org_mozilla_gecko_media_SampleBuffer_nativeReadFromDirectBuffer(
+    JNIEnv* jenv, jclass, jobject src, jlong dest, jint offset, jint size) {
+  uint8_t* from = static_cast<uint8_t*>(jenv->GetDirectBufferAddress(src));
+  if (from == nullptr) {
+    jenv->ThrowNew(jenv->FindClass("java/lang/NullPointerException"),
+                   "Null direct buffer");
+    return;
+  }
+
+  void* to = reinterpret_cast<void*>(dest);
+  if (to == nullptr) {
+    jenv->ThrowNew(jenv->FindClass("java/lang/NullPointerException"),
+                   "Null shared memory buffer");
+    return;
+  }
+
+  memcpy(to, from + offset, size);
+}
+
+JNIEXPORT
+void JNICALL
+Java_org_mozilla_gecko_media_SampleBuffer_nativeWriteToDirectBuffer(
+    JNIEnv* jenv, jclass, jlong src, jobject dest, jint offset, jint size) {
+  uint8_t* from = reinterpret_cast<uint8_t*>(src);
+  if (from == nullptr) {
+    jenv->ThrowNew(jenv->FindClass("java/lang/NullPointerException"),
+                   "Null shared memory buffer");
+    return;
+  }
+
+  void* to = jenv->GetDirectBufferAddress(dest);
+  if (to == nullptr) {
+    jenv->ThrowNew(jenv->FindClass("java/lang/NullPointerException"),
+                   "Null direct buffer");
+    return;
+  }
+
+  memcpy(to, from + offset, size);
+}
+
+JNIEXPORT
+jlong JNICALL Java_org_mozilla_gecko_mozglue_SharedMemory_map(JNIEnv* env,
+                                                              jobject jobj,
+                                                              jint fd,
+                                                              jint length) {
+  void* address = mmap(NULL, length, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+  if (address == MAP_FAILED) {
+    char msg[128];
+    SprintfLiteral(msg, "mmap failed. errno=%d", errno);
+    env->ThrowNew(env->FindClass("java/lang/NullPointerException"), msg);
+    return 0;
+  }
+  return jlong(address);
+}
+
+JNIEXPORT
+void JNICALL Java_org_mozilla_gecko_mozglue_SharedMemory_unmap(JNIEnv* env,
+                                                               jobject jobj,
+                                                               jlong address,
+                                                               jint size) {
+  munmap((void*)address, (size_t)size);
+}
+}
diff --git a/mozglue/android/moz.build b/mozglue/android/moz.build
new file mode 100644
index 0000000000..bf5813d963
--- /dev/null
+++ b/mozglue/android/moz.build
@@ -0,0 +1,44 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+EXPORTS += [
+    "APKOpen.h",
+]
+
+EXPORTS.mozilla += ["Ashmem.h"]
+
+SOURCES += [
+    "APKOpen.cpp",
+    "Ashmem.cpp",
+    "nsGeckoUtils.cpp",
+    "SharedMemNatives.cpp",
+]
+
+FINAL_LIBRARY = "mozglue"
+
+for var in ("ANDROID_PACKAGE_NAME", "ANDROID_CPU_ARCH"):
+    DEFINES[var] = '"%s"' % CONFIG[var]
+
+if CONFIG["MOZ_FOLD_LIBS"]:
+    DEFINES["MOZ_FOLD_LIBS"] = True
+
+LOCAL_INCLUDES += [
+    "!/build",
+    "../linker",
+    "/ipc/chromium/src",
+    "/nsprpub/lib/ds",
+    "/nsprpub/lib/libc/include",
+    "/nsprpub/pr/include",
+    "/third_party/sqlite3/src",
+    "/toolkit/components/startup",
+    "/xpcom/build",
+]
+
+DEFINES["XPCOM_GLUE"] = True
+
+USE_LIBS += [
+    "xpcomglue",
+]
diff --git a/mozglue/android/nsGeckoUtils.cpp b/mozglue/android/nsGeckoUtils.cpp
new file mode 100644
index 0000000000..834e2d05fc
--- /dev/null
+++ b/mozglue/android/nsGeckoUtils.cpp
@@ -0,0 +1,22 @@
+/* -*- Mode: c++; c-basic-offset: 2; tab-width: 20; indent-tabs-mode: nil; -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <jni.h>
+
+#include <stdlib.h>
+#include <string.h>
+#include "APKOpen.h"
+
+extern "C" __attribute__((visibility("default"))) void MOZ_JNICALL
+Java_org_mozilla_gecko_mozglue_GeckoLoader_putenv(JNIEnv* jenv, jclass,
+                                                  jstring map) {
+  const char* str;
+  // XXX: java doesn't give us true UTF8, we should figure out something
+  // better to do here
+  str = jenv->GetStringUTFChars(map, nullptr);
+  if (str == nullptr) return;
+  putenv(strdup(str));
+  jenv->ReleaseStringUTFChars(map, str);
+}