Mappable *
ElfLoader::GetMappableFromPath(const char *path)
{
const char *name = LeafName(path);
Mappable *mappable = NULL;
RefPtr<Zip> zip;
const char *subpath;
if ((subpath = strchr(path, '!'))) {
char *zip_path = strndup(path, subpath - path);
while (*(++subpath) == '/') { }
zip = ZipCollection::GetZip(zip_path);
Zip::Stream s;
if (zip && zip->GetStream(subpath, &s)) {
/* When the MOZ_LINKER_EXTRACT environment variable is set to "1",
* compressed libraries are going to be (temporarily) extracted as
* files, in the directory pointed by the MOZ_LINKER_CACHE
* environment variable. */
const char *extract = getenv("MOZ_LINKER_EXTRACT");
if (extract && !strncmp(extract, "1", 2 /* Including '\0' */))
mappable = MappableExtractFile::Create(name, zip, &s);
if (!mappable) {
if (s.GetType() == Zip::Stream::DEFLATE) {
mappable = MappableDeflate::Create(name, zip, &s);
} else if (s.GetType() == Zip::Stream::STORE) {
mappable = MappableSeekableZStream::Create(name, zip, &s);
}
}
}
}
/* If we couldn't load above, try with a MappableFile */
if (!mappable && !zip)
mappable = MappableFile::Create(path);
return mappable;
}
jobject MOZ_JNICALL
Java_org_mozilla_gecko_mozglue_NativeZip__1getInputStream(JNIEnv *jenv, jobject jzip, jlong obj, jstring path)
{
Zip *zip = (Zip *)obj;
const char* str;
str = jenv->GetStringUTFChars(path, nullptr);
Zip::Stream stream;
bool res = zip->GetStream(str, &stream);
jenv->ReleaseStringUTFChars(path, str);
if (!res) {
return nullptr;
}
jobject buf = jenv->NewDirectByteBuffer(const_cast<void *>(stream.GetBuffer()), stream.GetSize());
if (!buf) {
JNI_Throw(jenv, "java/lang/RuntimeException", "Failed to create ByteBuffer");
return nullptr;
}
jclass nativeZip = jenv->GetObjectClass(jzip);
jmethodID method = jenv->GetMethodID(nativeZip, "createInputStream", "(Ljava/nio/ByteBuffer;I)Ljava/io/InputStream;");
// Since this function is only expected to be called from Java, it is safe
// to skip exception checking for the method call below, as long as no
// other Native -> Java call doesn't happen before returning to Java.
return jenv->CallObjectMethod(jzip, method, buf, (jint) stream.GetType());
}
static void *
extractBuf(const char * path, Zip *zip)
{
Zip::Stream s;
if (!zip->GetStream(path, &s))
return NULL;
void * buf = malloc(s.GetUncompressedSize());
if (buf == (void *)-1) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Couldn't alloc decompression buffer for %s", path);
return NULL;
}
if (s.GetType() == Zip::Stream::DEFLATE)
extractLib(s, buf);
else
memcpy(buf, s.GetBuffer(), s.GetUncompressedSize());
return buf;
}
static void *
extractBuf(const char * path, Zip *zip)
{
Zip::Stream s;
if (!zip->GetStream(path, &s))
return NULL;
// allocate space for a trailing null byte
void * buf = malloc(s.GetUncompressedSize() + 1);
if (buf == (void *)-1) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Couldn't alloc decompression buffer for %s", path);
return NULL;
}
if (s.GetType() == Zip::Stream::DEFLATE)
extractLib(s, buf);
else
memcpy(buf, s.GetBuffer(), s.GetUncompressedSize());
// null terminate it
((unsigned char*) buf)[s.GetUncompressedSize()] = 0;
return buf;
}
static void * mozload(const char * path, Zip *zip)
{
#ifdef DEBUG
struct timeval t0, t1;
gettimeofday(&t0, 0);
#endif
void *handle;
Zip::Stream s;
if (!zip->GetStream(path, &s))
return NULL;
if (extractLibs) {
char fullpath[PATH_MAX];
snprintf(fullpath, PATH_MAX, "%s/%s", getenv("MOZ_LINKER_CACHE"), path);
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "resolved %s to %s", path, fullpath);
extractFile(fullpath, s);
handle = __wrap_dlopen(fullpath, RTLD_LAZY);
if (!handle)
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Couldn't load %s because %s", fullpath, __wrap_dlerror());
#ifdef DEBUG
gettimeofday(&t1, 0);
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "%s: spent %d", path,
(((long long)t1.tv_sec * 1000000LL) +
(long long)t1.tv_usec) -
(((long long)t0.tv_sec * 1000000LL) +
(long long)t0.tv_usec));
#endif
return handle;
}
int fd;
void * buf = NULL;
uint32_t lib_size = s.GetUncompressedSize();
int cache_fd = 0;
if (s.GetType() == Zip::Stream::DEFLATE) {
cache_fd = lookupLibCacheFd(path);
fd = cache_fd;
if (fd < 0)
fd = createAshmem(lib_size, path);
#ifdef DEBUG
else
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Loading %s from cache", path);
#endif
if (fd < 0) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Couldn't open " ASHMEM_NAME_DEF ", Error %d, %s, bailing out", errno, strerror(errno));
return NULL;
}
buf = mmap(NULL, lib_size,
PROT_READ | PROT_WRITE,
MAP_SHARED, fd, 0);
if (buf == (void *)-1) {
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Couldn't mmap decompression buffer");
close(fd);
return NULL;
}
if (cache_fd < 0) {
extractLib(s, buf);
#ifdef ANDROID_ARM_LINKER
/* We just extracted data that is going to be executed in the future.
* We thus need to ensure Instruction and Data cache coherency. */
cacheflush((unsigned) buf, (unsigned) buf + s.GetUncompressedSize(), 0);
#endif
addLibCacheFd(path, fd, lib_size, buf);
}
// preload libxul, to avoid slowly demand-paging it
if (!strcmp(path, "libxul.so"))
madvise(buf, s.GetUncompressedSize(), MADV_WILLNEED);
}
#ifdef DEBUG
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Loading %s with len %d (0x%08x)", path, lib_size, lib_size);
#endif
handle = moz_mapped_dlopen(path, RTLD_LAZY, fd, buf,
lib_size, 0);
if (!handle)
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "Couldn't load %s because %s", path, __wrap_dlerror());
if (buf)
munmap(buf, lib_size);
#ifdef DEBUG
gettimeofday(&t1, 0);
__android_log_print(ANDROID_LOG_ERROR, "GeckoLibLoad", "%s: spent %d", path, (((long long)t1.tv_sec * 1000000LL) + (long long)t1.tv_usec) -
(((long long)t0.tv_sec * 1000000LL) + (long long)t0.tv_usec));
#endif
return handle;
}
TemporaryRef<LibHandle>
ElfLoader::Load(const char *path, int flags, LibHandle *parent)
{
RefPtr<LibHandle> handle;
/* Handle dlopen(NULL) directly. */
if (!path) {
handle = SystemElf::Load(NULL, flags);
return handle;
}
/* TODO: Handle relative paths correctly */
const char *name = LeafName(path);
/* Search the list of handles we already have for a match. When the given
* path is not absolute, compare file names, otherwise compare full paths. */
if (name == path) {
for (LibHandleList::iterator it = handles.begin(); it < handles.end(); ++it)
if ((*it)->GetName() && (strcmp((*it)->GetName(), name) == 0))
return *it;
} else {
for (LibHandleList::iterator it = handles.begin(); it < handles.end(); ++it)
if ((*it)->GetPath() && (strcmp((*it)->GetPath(), path) == 0))
return *it;
}
char *abs_path = NULL;
const char *requested_path = path;
/* When the path is not absolute and the library is being loaded for
* another, first try to load the library from the directory containing
* that parent library. */
if ((name == path) && parent) {
const char *parentPath = parent->GetPath();
abs_path = new char[strlen(parentPath) + strlen(path)];
strcpy(abs_path, parentPath);
char *slash = strrchr(abs_path, '/');
strcpy(slash + 1, path);
path = abs_path;
}
/* Create a mappable object for the given path. Paths in the form
* /foo/bar/baz/archive!/directory/lib.so
* try to load the directory/lib.so in /foo/bar/baz/archive, provided
* that file is a Zip archive. */
Mappable *mappable = NULL;
RefPtr<Zip> zip;
const char *subpath;
if ((subpath = strchr(path, '!'))) {
char *zip_path = strndup(path, subpath - path);
while (*(++subpath) == '/') { }
zip = zips.GetZip(zip_path);
Zip::Stream s;
if (zip && zip->GetStream(subpath, &s)) {
/* When the MOZ_LINKER_EXTRACT environment variable is set to "1",
* compressed libraries are going to be (temporarily) extracted as
* files, in the directory pointed by the MOZ_LINKER_CACHE
* environment variable. */
const char *extract = getenv("MOZ_LINKER_EXTRACT");
if (extract && !strncmp(extract, "1", 2 /* Including '\0' */))
mappable = MappableExtractFile::Create(name, zip, &s);
if (!mappable) {
if (s.GetType() == Zip::Stream::DEFLATE) {
mappable = MappableDeflate::Create(name, zip, &s);
} else if (s.GetType() == Zip::Stream::STORE) {
mappable = MappableSeekableZStream::Create(name, zip, &s);
}
}
}
}
/* If we couldn't load above, try with a MappableFile */
if (!mappable && !zip)
mappable = MappableFile::Create(path);
/* Try loading with the custom linker if we have a Mappable */
if (mappable)
handle = CustomElf::Load(mappable, path, flags);
/* Try loading with the system linker if everything above failed */
if (!handle)
handle = SystemElf::Load(path, flags);
/* If we didn't have an absolute path and haven't been able to load
* a library yet, try in the system search path */
if (!handle && abs_path)
handle = SystemElf::Load(name, flags);
delete [] abs_path;
debug("ElfLoader::Load(\"%s\", 0x%x, %p [\"%s\"]) = %p", requested_path, flags,
reinterpret_cast<void *>(parent), parent ? parent->GetPath() : "",
static_cast<void *>(handle));
return handle;
}