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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// A simple implementation of the native-bridge interface.
#include <algorithm>
#include <dlfcn.h>
#include <jni.h>
#include <stdlib.h>
#include <signal.h>
#include <vector>
#include "stdio.h"
#include "unistd.h"
#include "sys/stat.h"
#include "base/macros.h"
#include "nativebridge/native_bridge.h"
struct NativeBridgeMethod {
const char* name;
const char* signature;
bool static_method;
void* fnPtr;
void* trampoline;
};
static NativeBridgeMethod* find_native_bridge_method(const char *name);
static const android::NativeBridgeRuntimeCallbacks* gNativeBridgeArtCallbacks;
static jint trampoline_JNI_OnLoad(JavaVM* vm, void* reserved) {
JNIEnv* env = nullptr;
typedef jint (*FnPtr_t)(JavaVM*, void*);
FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("JNI_OnLoad")->fnPtr);
vm->GetEnv(reinterpret_cast<void **>(&env), JNI_VERSION_1_6);
if (env == nullptr) {
return 0;
}
jclass klass = env->FindClass("Main");
if (klass != nullptr) {
int i, count1, count2;
count1 = gNativeBridgeArtCallbacks->getNativeMethodCount(env, klass);
std::unique_ptr<JNINativeMethod[]> methods(new JNINativeMethod[count1]);
if (methods == nullptr) {
return 0;
}
count2 = gNativeBridgeArtCallbacks->getNativeMethods(env, klass, methods.get(), count1);
if (count1 == count2) {
printf("Test ART callbacks: all JNI function number is %d.\n", count1);
}
for (i = 0; i < count1; i++) {
NativeBridgeMethod* nb_method = find_native_bridge_method(methods[i].name);
if (nb_method != nullptr) {
jmethodID mid = nullptr;
if (nb_method->static_method) {
mid = env->GetStaticMethodID(klass, methods[i].name, nb_method->signature);
} else {
mid = env->GetMethodID(klass, methods[i].name, nb_method->signature);
}
if (mid != nullptr) {
const char* shorty = gNativeBridgeArtCallbacks->getMethodShorty(env, mid);
if (strcmp(shorty, methods[i].signature) == 0) {
printf(" name:%s, signature:%s, shorty:%s.\n",
methods[i].name, nb_method->signature, shorty);
}
}
}
}
methods.release();
}
printf("%s called!\n", __FUNCTION__);
return fnPtr(vm, reserved);
}
static void trampoline_Java_Main_testFindClassOnAttachedNativeThread(JNIEnv* env,
jclass klass) {
typedef void (*FnPtr_t)(JNIEnv*, jclass);
FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
(find_native_bridge_method("testFindClassOnAttachedNativeThread")->fnPtr);
printf("%s called!\n", __FUNCTION__);
return fnPtr(env, klass);
}
static void trampoline_Java_Main_testFindFieldOnAttachedNativeThreadNative(JNIEnv* env,
jclass klass) {
typedef void (*FnPtr_t)(JNIEnv*, jclass);
FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
(find_native_bridge_method("testFindFieldOnAttachedNativeThreadNative")->fnPtr);
printf("%s called!\n", __FUNCTION__);
return fnPtr(env, klass);
}
static void trampoline_Java_Main_testCallStaticVoidMethodOnSubClassNative(JNIEnv* env,
jclass klass) {
typedef void (*FnPtr_t)(JNIEnv*, jclass);
FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
(find_native_bridge_method("testCallStaticVoidMethodOnSubClassNative")->fnPtr);
printf("%s called!\n", __FUNCTION__);
return fnPtr(env, klass);
}
static jobject trampoline_Java_Main_testGetMirandaMethodNative(JNIEnv* env, jclass klass) {
typedef jobject (*FnPtr_t)(JNIEnv*, jclass);
FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
(find_native_bridge_method("testGetMirandaMethodNative")->fnPtr);
printf("%s called!\n", __FUNCTION__);
return fnPtr(env, klass);
}
static void trampoline_Java_Main_testNewStringObject(JNIEnv* env, jclass klass) {
typedef void (*FnPtr_t)(JNIEnv*, jclass);
FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
(find_native_bridge_method("testNewStringObject")->fnPtr);
printf("%s called!\n", __FUNCTION__);
return fnPtr(env, klass);
}
static void trampoline_Java_Main_testZeroLengthByteBuffers(JNIEnv* env, jclass klass) {
typedef void (*FnPtr_t)(JNIEnv*, jclass);
FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
(find_native_bridge_method("testZeroLengthByteBuffers")->fnPtr);
printf("%s called!\n", __FUNCTION__);
return fnPtr(env, klass);
}
static jbyte trampoline_Java_Main_byteMethod(JNIEnv* env, jclass klass, jbyte b1, jbyte b2,
jbyte b3, jbyte b4, jbyte b5, jbyte b6,
jbyte b7, jbyte b8, jbyte b9, jbyte b10) {
typedef jbyte (*FnPtr_t)(JNIEnv*, jclass, jbyte, jbyte, jbyte, jbyte, jbyte,
jbyte, jbyte, jbyte, jbyte, jbyte);
FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("byteMethod")->fnPtr);
printf("%s called!\n", __FUNCTION__);
return fnPtr(env, klass, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10);
}
static jshort trampoline_Java_Main_shortMethod(JNIEnv* env, jclass klass, jshort s1, jshort s2,
jshort s3, jshort s4, jshort s5, jshort s6,
jshort s7, jshort s8, jshort s9, jshort s10) {
typedef jshort (*FnPtr_t)(JNIEnv*, jclass, jshort, jshort, jshort, jshort, jshort,
jshort, jshort, jshort, jshort, jshort);
FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("shortMethod")->fnPtr);
printf("%s called!\n", __FUNCTION__);
return fnPtr(env, klass, s1, s2, s3, s4, s5, s6, s7, s8, s9, s10);
}
static jboolean trampoline_Java_Main_booleanMethod(JNIEnv* env, jclass klass, jboolean b1,
jboolean b2, jboolean b3, jboolean b4,
jboolean b5, jboolean b6, jboolean b7,
jboolean b8, jboolean b9, jboolean b10) {
typedef jboolean (*FnPtr_t)(JNIEnv*, jclass, jboolean, jboolean, jboolean, jboolean, jboolean,
jboolean, jboolean, jboolean, jboolean, jboolean);
FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("booleanMethod")->fnPtr);
printf("%s called!\n", __FUNCTION__);
return fnPtr(env, klass, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10);
}
static jchar trampoline_Java_Main_charMethod(JNIEnv* env, jclass klass, jchar c1, jchar c2,
jchar c3, jchar c4, jchar c5, jchar c6,
jchar c7, jchar c8, jchar c9, jchar c10) {
typedef jchar (*FnPtr_t)(JNIEnv*, jclass, jchar, jchar, jchar, jchar, jchar,
jchar, jchar, jchar, jchar, jchar);
FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("charMethod")->fnPtr);
printf("%s called!\n", __FUNCTION__);
return fnPtr(env, klass, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10);
}
// This code is adapted from 004-SignalTest and causes a segfault.
char *go_away_compiler = nullptr;
[[ noreturn ]] static void test_sigaction_handler(int sig ATTRIBUTE_UNUSED,
siginfo_t* info ATTRIBUTE_UNUSED,
void* context ATTRIBUTE_UNUSED) {
printf("Should not reach the test sigaction handler.");
abort();
}
static jint trampoline_Java_Main_testSignal(JNIEnv*, jclass) {
// Install the sigaction handler above, which should *not* be reached as the native-bridge
// handler should be called first. Note: we won't chain at all, if we ever get here, we'll die.
struct sigaction tmp;
sigemptyset(&tmp.sa_mask);
tmp.sa_sigaction = test_sigaction_handler;
#if !defined(__APPLE__) && !defined(__mips__)
tmp.sa_restorer = nullptr;
#endif
// Test segv
sigaction(SIGSEGV, &tmp, nullptr);
#if defined(__arm__) || defined(__i386__) || defined(__aarch64__)
*go_away_compiler = 'a';
#elif defined(__x86_64__)
// Cause a SEGV using an instruction known to be 2 bytes long to account for hardcoded jump
// in the signal handler
asm volatile("movl $0, %%eax;" "movb %%ah, (%%rax);" : : : "%eax");
#else
// On other architectures we simulate SEGV.
kill(getpid(), SIGSEGV);
#endif
// Test sigill
sigaction(SIGILL, &tmp, nullptr);
kill(getpid(), SIGILL);
return 1234;
}
NativeBridgeMethod gNativeBridgeMethods[] = {
{ "JNI_OnLoad", "", true, nullptr,
reinterpret_cast<void*>(trampoline_JNI_OnLoad) },
{ "booleanMethod", "(ZZZZZZZZZZ)Z", true, nullptr,
reinterpret_cast<void*>(trampoline_Java_Main_booleanMethod) },
{ "byteMethod", "(BBBBBBBBBB)B", true, nullptr,
reinterpret_cast<void*>(trampoline_Java_Main_byteMethod) },
{ "charMethod", "(CCCCCCCCCC)C", true, nullptr,
reinterpret_cast<void*>(trampoline_Java_Main_charMethod) },
{ "shortMethod", "(SSSSSSSSSS)S", true, nullptr,
reinterpret_cast<void*>(trampoline_Java_Main_shortMethod) },
{ "testCallStaticVoidMethodOnSubClassNative", "()V", true, nullptr,
reinterpret_cast<void*>(trampoline_Java_Main_testCallStaticVoidMethodOnSubClassNative) },
{ "testFindClassOnAttachedNativeThread", "()V", true, nullptr,
reinterpret_cast<void*>(trampoline_Java_Main_testFindClassOnAttachedNativeThread) },
{ "testFindFieldOnAttachedNativeThreadNative", "()V", true, nullptr,
reinterpret_cast<void*>(trampoline_Java_Main_testFindFieldOnAttachedNativeThreadNative) },
{ "testGetMirandaMethodNative", "()Ljava/lang/reflect/Method;", true, nullptr,
reinterpret_cast<void*>(trampoline_Java_Main_testGetMirandaMethodNative) },
{ "testNewStringObject", "()V", true, nullptr,
reinterpret_cast<void*>(trampoline_Java_Main_testNewStringObject) },
{ "testZeroLengthByteBuffers", "()V", true, nullptr,
reinterpret_cast<void*>(trampoline_Java_Main_testZeroLengthByteBuffers) },
{ "testSignal", "()I", true, nullptr,
reinterpret_cast<void*>(trampoline_Java_Main_testSignal) },
};
static NativeBridgeMethod* find_native_bridge_method(const char *name) {
const char* pname = name;
if (strncmp(name, "Java_Main_", 10) == 0) {
pname += 10;
}
for (size_t i = 0; i < sizeof(gNativeBridgeMethods) / sizeof(gNativeBridgeMethods[0]); i++) {
if (strcmp(pname, gNativeBridgeMethods[i].name) == 0) {
return &gNativeBridgeMethods[i];
}
}
return nullptr;
}
// NativeBridgeCallbacks implementations
extern "C" bool native_bridge_initialize(const android::NativeBridgeRuntimeCallbacks* art_cbs,
const char* app_code_cache_dir,
const char* isa ATTRIBUTE_UNUSED) {
struct stat st;
if ((app_code_cache_dir != nullptr)
&& (stat(app_code_cache_dir, &st) == 0)
&& S_ISDIR(st.st_mode)) {
printf("Code cache exists: '%s'.\n", app_code_cache_dir);
}
if (art_cbs != nullptr) {
gNativeBridgeArtCallbacks = art_cbs;
printf("Native bridge initialized.\n");
}
return true;
}
extern "C" void* native_bridge_loadLibrary(const char* libpath, int flag) {
size_t len = strlen(libpath);
char* tmp = new char[len + 10];
strncpy(tmp, libpath, len);
tmp[len - 3] = '2';
tmp[len - 2] = '.';
tmp[len - 1] = 's';
tmp[len] = 'o';
tmp[len + 1] = 0;
void* handle = dlopen(tmp, flag);
delete[] tmp;
if (handle == nullptr) {
printf("Handle = nullptr!\n");
printf("Was looking for %s.\n", libpath);
printf("Error = %s.\n", dlerror());
char cwd[1024];
if (getcwd(cwd, sizeof(cwd)) != nullptr) {
printf("Current working dir: %s\n", cwd);
}
}
return handle;
}
extern "C" void* native_bridge_getTrampoline(void* handle, const char* name, const char* shorty,
uint32_t len ATTRIBUTE_UNUSED) {
printf("Getting trampoline for %s with shorty %s.\n", name, shorty);
// The name here is actually the JNI name, so we can directly do the lookup.
void* sym = dlsym(handle, name);
NativeBridgeMethod* method = find_native_bridge_method(name);
if (method == nullptr)
return nullptr;
method->fnPtr = sym;
return method->trampoline;
}
extern "C" bool native_bridge_isSupported(const char* libpath) {
printf("Checking for support.\n");
if (libpath == nullptr) {
return false;
}
// We don't want to hijack javacore. So we should get libarttest...
return strcmp(libpath, "libjavacore.so") != 0;
}
namespace android {
// Environment values required by the apps running with native bridge.
struct NativeBridgeRuntimeValues {
const char* os_arch;
const char* cpu_abi;
const char* cpu_abi2;
const char* *supported_abis;
int32_t abi_count;
};
} // namespace android
const char* supported_abis[] = {
"supported1", "supported2", "supported3"
};
const struct android::NativeBridgeRuntimeValues nb_env {
.os_arch = "os.arch",
.cpu_abi = "cpu_abi",
.cpu_abi2 = "cpu_abi2",
.supported_abis = supported_abis,
.abi_count = 3
};
extern "C" const struct android::NativeBridgeRuntimeValues* native_bridge_getAppEnv(
const char* abi) {
printf("Checking for getEnvValues.\n");
if (abi == nullptr) {
return nullptr;
}
return &nb_env;
}
// v2 parts.
extern "C" bool nb_is_compatible(uint32_t bridge_version ATTRIBUTE_UNUSED) {
return true;
}
#if defined(__i386__) || defined(__x86_64__)
#if defined(__APPLE__)
#define ucontext __darwin_ucontext
#if defined(__x86_64__)
// 64 bit mac build.
#define CTX_EIP uc_mcontext->__ss.__rip
#else
// 32 bit mac build.
#define CTX_EIP uc_mcontext->__ss.__eip
#endif
#elif defined(__x86_64__)
// 64 bit linux build.
#define CTX_EIP uc_mcontext.gregs[REG_RIP]
#else
// 32 bit linux build.
#define CTX_EIP uc_mcontext.gregs[REG_EIP]
#endif
#endif
// A dummy special handler, continueing after the faulting location. This code comes from
// 004-SignalTest.
static bool nb_signalhandler(int sig, siginfo_t* info ATTRIBUTE_UNUSED, void* context) {
printf("NB signal handler with signal %d.\n", sig);
if (sig == SIGSEGV) {
#if defined(__arm__)
struct ucontext *uc = reinterpret_cast<struct ucontext*>(context);
struct sigcontext *sc = reinterpret_cast<struct sigcontext*>(&uc->uc_mcontext);
sc->arm_pc += 2; // Skip instruction causing segv & sigill.
#elif defined(__aarch64__)
struct ucontext *uc = reinterpret_cast<struct ucontext*>(context);
struct sigcontext *sc = reinterpret_cast<struct sigcontext*>(&uc->uc_mcontext);
sc->pc += 4; // Skip instruction causing segv & sigill.
#elif defined(__i386__)
struct ucontext *uc = reinterpret_cast<struct ucontext*>(context);
uc->CTX_EIP += 3;
#elif defined(__x86_64__)
struct ucontext *uc = reinterpret_cast<struct ucontext*>(context);
uc->CTX_EIP += 2;
#else
UNUSED(context);
#endif
}
// We handled this...
return true;
}
static ::android::NativeBridgeSignalHandlerFn native_bridge_get_signal_handler(int signal) {
// Test segv for already claimed signal, and sigill for not claimed signal
if ((signal == SIGSEGV) || (signal == SIGILL)) {
return &nb_signalhandler;
}
return nullptr;
}
// "NativeBridgeItf" is effectively an API (it is the name of the symbol that will be loaded
// by the native bridge library).
android::NativeBridgeCallbacks NativeBridgeItf {
.version = 2,
.initialize = &native_bridge_initialize,
.loadLibrary = &native_bridge_loadLibrary,
.getTrampoline = &native_bridge_getTrampoline,
.isSupported = &native_bridge_isSupported,
.getAppEnv = &native_bridge_getAppEnv,
.isCompatibleWith = &nb_is_compatible,
.getSignalHandler = &native_bridge_get_signal_handler
};