1 /*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 // A simple implementation of the native-bridge interface.
18
19 #include <algorithm>
20 #include <dlfcn.h>
21 #include <jni.h>
22 #include <stdlib.h>
23 #include <signal.h>
24 #include <vector>
25
26 #include "stdio.h"
27 #include "unistd.h"
28 #include "sys/stat.h"
29 #include "setjmp.h"
30
31 #include "base/macros.h"
32 #include "nativebridge/native_bridge.h"
33
34 struct NativeBridgeMethod {
35 const char* name;
36 const char* signature;
37 bool static_method;
38 void* fnPtr;
39 void* trampoline;
40 };
41
42 static NativeBridgeMethod* find_native_bridge_method(const char *name);
43 static const android::NativeBridgeRuntimeCallbacks* gNativeBridgeArtCallbacks;
44
trampoline_JNI_OnLoad(JavaVM * vm,void * reserved)45 static jint trampoline_JNI_OnLoad(JavaVM* vm, void* reserved) {
46 JNIEnv* env = nullptr;
47 typedef jint (*FnPtr_t)(JavaVM*, void*);
48 FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("JNI_OnLoad")->fnPtr);
49
50 vm->GetEnv(reinterpret_cast<void **>(&env), JNI_VERSION_1_6);
51 if (env == nullptr) {
52 return 0;
53 }
54
55 jclass klass = env->FindClass("Main");
56 if (klass != nullptr) {
57 int i, count1, count2;
58 count1 = gNativeBridgeArtCallbacks->getNativeMethodCount(env, klass);
59 std::unique_ptr<JNINativeMethod[]> methods(new JNINativeMethod[count1]);
60 if (methods == nullptr) {
61 return 0;
62 }
63 count2 = gNativeBridgeArtCallbacks->getNativeMethods(env, klass, methods.get(), count1);
64 if (count1 == count2) {
65 printf("Test ART callbacks: all JNI function number is %d.\n", count1);
66 }
67
68 for (i = 0; i < count1; i++) {
69 NativeBridgeMethod* nb_method = find_native_bridge_method(methods[i].name);
70 if (nb_method != nullptr) {
71 jmethodID mid = nullptr;
72 if (nb_method->static_method) {
73 mid = env->GetStaticMethodID(klass, methods[i].name, nb_method->signature);
74 } else {
75 mid = env->GetMethodID(klass, methods[i].name, nb_method->signature);
76 }
77 if (mid != nullptr) {
78 const char* shorty = gNativeBridgeArtCallbacks->getMethodShorty(env, mid);
79 if (strcmp(shorty, methods[i].signature) == 0) {
80 printf(" name:%s, signature:%s, shorty:%s.\n",
81 methods[i].name, nb_method->signature, shorty);
82 }
83 }
84 }
85 }
86 methods.release();
87 }
88
89 printf("%s called!\n", __FUNCTION__);
90 return fnPtr(vm, reserved);
91 }
92
trampoline_Java_Main_testFindClassOnAttachedNativeThread(JNIEnv * env,jclass klass)93 static void trampoline_Java_Main_testFindClassOnAttachedNativeThread(JNIEnv* env,
94 jclass klass) {
95 typedef void (*FnPtr_t)(JNIEnv*, jclass);
96 FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
97 (find_native_bridge_method("testFindClassOnAttachedNativeThread")->fnPtr);
98 printf("%s called!\n", __FUNCTION__);
99 return fnPtr(env, klass);
100 }
101
trampoline_Java_Main_testFindFieldOnAttachedNativeThreadNative(JNIEnv * env,jclass klass)102 static void trampoline_Java_Main_testFindFieldOnAttachedNativeThreadNative(JNIEnv* env,
103 jclass klass) {
104 typedef void (*FnPtr_t)(JNIEnv*, jclass);
105 FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
106 (find_native_bridge_method("testFindFieldOnAttachedNativeThreadNative")->fnPtr);
107 printf("%s called!\n", __FUNCTION__);
108 return fnPtr(env, klass);
109 }
110
trampoline_Java_Main_testCallStaticVoidMethodOnSubClassNative(JNIEnv * env,jclass klass)111 static void trampoline_Java_Main_testCallStaticVoidMethodOnSubClassNative(JNIEnv* env,
112 jclass klass) {
113 typedef void (*FnPtr_t)(JNIEnv*, jclass);
114 FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
115 (find_native_bridge_method("testCallStaticVoidMethodOnSubClassNative")->fnPtr);
116 printf("%s called!\n", __FUNCTION__);
117 return fnPtr(env, klass);
118 }
119
trampoline_Java_Main_testGetMirandaMethodNative(JNIEnv * env,jclass klass)120 static jobject trampoline_Java_Main_testGetMirandaMethodNative(JNIEnv* env, jclass klass) {
121 typedef jobject (*FnPtr_t)(JNIEnv*, jclass);
122 FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
123 (find_native_bridge_method("testGetMirandaMethodNative")->fnPtr);
124 printf("%s called!\n", __FUNCTION__);
125 return fnPtr(env, klass);
126 }
127
trampoline_Java_Main_testNewStringObject(JNIEnv * env,jclass klass)128 static void trampoline_Java_Main_testNewStringObject(JNIEnv* env, jclass klass) {
129 typedef void (*FnPtr_t)(JNIEnv*, jclass);
130 FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
131 (find_native_bridge_method("testNewStringObject")->fnPtr);
132 printf("%s called!\n", __FUNCTION__);
133 return fnPtr(env, klass);
134 }
135
trampoline_Java_Main_testZeroLengthByteBuffers(JNIEnv * env,jclass klass)136 static void trampoline_Java_Main_testZeroLengthByteBuffers(JNIEnv* env, jclass klass) {
137 typedef void (*FnPtr_t)(JNIEnv*, jclass);
138 FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>
139 (find_native_bridge_method("testZeroLengthByteBuffers")->fnPtr);
140 printf("%s called!\n", __FUNCTION__);
141 return fnPtr(env, klass);
142 }
143
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)144 static jbyte trampoline_Java_Main_byteMethod(JNIEnv* env, jclass klass, jbyte b1, jbyte b2,
145 jbyte b3, jbyte b4, jbyte b5, jbyte b6,
146 jbyte b7, jbyte b8, jbyte b9, jbyte b10) {
147 typedef jbyte (*FnPtr_t)(JNIEnv*, jclass, jbyte, jbyte, jbyte, jbyte, jbyte,
148 jbyte, jbyte, jbyte, jbyte, jbyte);
149 FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("byteMethod")->fnPtr);
150 printf("%s called!\n", __FUNCTION__);
151 return fnPtr(env, klass, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10);
152 }
153
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)154 static jshort trampoline_Java_Main_shortMethod(JNIEnv* env, jclass klass, jshort s1, jshort s2,
155 jshort s3, jshort s4, jshort s5, jshort s6,
156 jshort s7, jshort s8, jshort s9, jshort s10) {
157 typedef jshort (*FnPtr_t)(JNIEnv*, jclass, jshort, jshort, jshort, jshort, jshort,
158 jshort, jshort, jshort, jshort, jshort);
159 FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("shortMethod")->fnPtr);
160 printf("%s called!\n", __FUNCTION__);
161 return fnPtr(env, klass, s1, s2, s3, s4, s5, s6, s7, s8, s9, s10);
162 }
163
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)164 static jboolean trampoline_Java_Main_booleanMethod(JNIEnv* env, jclass klass, jboolean b1,
165 jboolean b2, jboolean b3, jboolean b4,
166 jboolean b5, jboolean b6, jboolean b7,
167 jboolean b8, jboolean b9, jboolean b10) {
168 typedef jboolean (*FnPtr_t)(JNIEnv*, jclass, jboolean, jboolean, jboolean, jboolean, jboolean,
169 jboolean, jboolean, jboolean, jboolean, jboolean);
170 FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("booleanMethod")->fnPtr);
171 printf("%s called!\n", __FUNCTION__);
172 return fnPtr(env, klass, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10);
173 }
174
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)175 static jchar trampoline_Java_Main_charMethod(JNIEnv* env, jclass klass, jchar c1, jchar c2,
176 jchar c3, jchar c4, jchar c5, jchar c6,
177 jchar c7, jchar c8, jchar c9, jchar c10) {
178 typedef jchar (*FnPtr_t)(JNIEnv*, jclass, jchar, jchar, jchar, jchar, jchar,
179 jchar, jchar, jchar, jchar, jchar);
180 FnPtr_t fnPtr = reinterpret_cast<FnPtr_t>(find_native_bridge_method("charMethod")->fnPtr);
181 printf("%s called!\n", __FUNCTION__);
182 return fnPtr(env, klass, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10);
183 }
184
185 // This code is adapted from 004-SignalTest and causes a segfault.
186 char *go_away_compiler = nullptr;
187
test_sigaction_handler(int sig ATTRIBUTE_UNUSED,siginfo_t * info ATTRIBUTE_UNUSED,void * context ATTRIBUTE_UNUSED)188 [[ noreturn ]] static void test_sigaction_handler(int sig ATTRIBUTE_UNUSED,
189 siginfo_t* info ATTRIBUTE_UNUSED,
190 void* context ATTRIBUTE_UNUSED) {
191 printf("Should not reach the test sigaction handler.");
192 abort();
193 }
194
raise_sigsegv()195 static void raise_sigsegv() {
196 #if defined(__arm__) || defined(__i386__) || defined(__aarch64__)
197 *go_away_compiler = 'a';
198 #elif defined(__x86_64__)
199 // Cause a SEGV using an instruction known to be 2 bytes long to account for hardcoded jump
200 // in the signal handler
201 asm volatile("movl $0, %%eax;" "movb %%ah, (%%rax);" : : : "%eax");
202 #else
203 // On other architectures we simulate SEGV.
204 kill(getpid(), SIGSEGV);
205 #endif
206 }
207
trampoline_Java_Main_testSignal(JNIEnv *,jclass)208 static jint trampoline_Java_Main_testSignal(JNIEnv*, jclass) {
209 // Install the sigaction handler above, which should *not* be reached as the native-bridge
210 // handler should be called first. Note: we won't chain at all, if we ever get here, we'll die.
211 struct sigaction tmp;
212 sigemptyset(&tmp.sa_mask);
213 tmp.sa_sigaction = test_sigaction_handler;
214 #if !defined(__APPLE__) && !defined(__mips__)
215 tmp.sa_restorer = nullptr;
216 #endif
217
218 // Test segv
219 sigaction(SIGSEGV, &tmp, nullptr);
220 raise_sigsegv();
221
222 // Test sigill
223 sigaction(SIGILL, &tmp, nullptr);
224 kill(getpid(), SIGILL);
225
226 return 1234;
227 }
228
229 // Status of the tricky control path of testSignalHandlerNotReturn.
230 //
231 // "kNone" is the default status except testSignalHandlerNotReturn,
232 // others are used by testSignalHandlerNotReturn.
233 enum class TestStatus {
234 kNone,
235 kRaiseFirst,
236 kHandleFirst,
237 kRaiseSecond,
238 kHandleSecond,
239 };
240
241 // State transition helper for testSignalHandlerNotReturn.
242 class SignalHandlerTestStatus {
243 public:
SignalHandlerTestStatus()244 SignalHandlerTestStatus() : state_(TestStatus::kNone) {
245 }
246
Get()247 TestStatus Get() {
248 return state_;
249 }
250
Reset()251 void Reset() {
252 Set(TestStatus::kNone);
253 }
254
Set(TestStatus state)255 void Set(TestStatus state) {
256 switch (state) {
257 case TestStatus::kNone:
258 AssertState(TestStatus::kHandleSecond);
259 break;
260
261 case TestStatus::kRaiseFirst:
262 AssertState(TestStatus::kNone);
263 break;
264
265 case TestStatus::kHandleFirst:
266 AssertState(TestStatus::kRaiseFirst);
267 break;
268
269 case TestStatus::kRaiseSecond:
270 AssertState(TestStatus::kHandleFirst);
271 break;
272
273 case TestStatus::kHandleSecond:
274 AssertState(TestStatus::kRaiseSecond);
275 break;
276
277 default:
278 printf("ERROR: unknown state\n");
279 abort();
280 }
281
282 state_ = state;
283 }
284
285 private:
286 TestStatus state_;
287
AssertState(TestStatus expected)288 void AssertState(TestStatus expected) {
289 if (state_ != expected) {
290 printf("ERROR: unexpected state, was %d, expected %d\n", state_, expected);
291 }
292 }
293 };
294
295 static SignalHandlerTestStatus gSignalTestStatus;
296 // The context is used to jump out from signal handler.
297 static sigjmp_buf gSignalTestJmpBuf;
298
299 // Test whether NativeBridge can receive future signal when its handler doesn't return.
300 //
301 // Control path:
302 // 1. Raise first SIGSEGV in test function.
303 // 2. Raise another SIGSEGV in NativeBridge's signal handler which is handling
304 // the first SIGSEGV.
305 // 3. Expect that NativeBridge's signal handler invokes again. And jump back
306 // to test function in when handling second SIGSEGV.
307 // 4. Exit test.
308 //
309 // NOTE: sigchain should be aware that "special signal handler" may not return.
310 // Pay attention if this case fails.
trampoline_Java_Main_testSignalHandlerNotReturn(JNIEnv *,jclass)311 static void trampoline_Java_Main_testSignalHandlerNotReturn(JNIEnv*, jclass) {
312 if (gSignalTestStatus.Get() != TestStatus::kNone) {
313 printf("ERROR: test already started?\n");
314 return;
315 }
316 printf("start testSignalHandlerNotReturn\n");
317
318 if (sigsetjmp(gSignalTestJmpBuf, 1) == 0) {
319 gSignalTestStatus.Set(TestStatus::kRaiseFirst);
320 printf("raising first SIGSEGV\n");
321 raise_sigsegv();
322 } else {
323 // jump to here from signal handler when handling second SIGSEGV.
324 if (gSignalTestStatus.Get() != TestStatus::kHandleSecond) {
325 printf("ERROR: not jump from second SIGSEGV?\n");
326 return;
327 }
328 gSignalTestStatus.Reset();
329 printf("back to test from signal handler via siglongjmp(), and done!\n");
330 }
331 }
332
333 // Signal handler for testSignalHandlerNotReturn.
334 // This handler won't return.
NotReturnSignalHandler()335 static bool NotReturnSignalHandler() {
336 if (gSignalTestStatus.Get() == TestStatus::kRaiseFirst) {
337 // handling first SIGSEGV
338 gSignalTestStatus.Set(TestStatus::kHandleFirst);
339 printf("handling first SIGSEGV, will raise another\n");
340 sigset_t set;
341 sigemptyset(&set);
342 sigaddset(&set, SIGSEGV);
343 printf("unblock SIGSEGV in handler\n");
344 sigprocmask(SIG_UNBLOCK, &set, nullptr);
345 gSignalTestStatus.Set(TestStatus::kRaiseSecond);
346 printf("raising second SIGSEGV\n");
347 raise_sigsegv(); // raise second SIGSEGV
348 } else if (gSignalTestStatus.Get() == TestStatus::kRaiseSecond) {
349 // handling second SIGSEGV
350 gSignalTestStatus.Set(TestStatus::kHandleSecond);
351 printf("handling second SIGSEGV, will jump back to test function\n");
352 siglongjmp(gSignalTestJmpBuf, 1);
353 }
354 printf("ERROR: should not reach here!\n");
355 return false;
356 }
357
358 NativeBridgeMethod gNativeBridgeMethods[] = {
359 { "JNI_OnLoad", "", true, nullptr,
360 reinterpret_cast<void*>(trampoline_JNI_OnLoad) },
361 { "booleanMethod", "(ZZZZZZZZZZ)Z", true, nullptr,
362 reinterpret_cast<void*>(trampoline_Java_Main_booleanMethod) },
363 { "byteMethod", "(BBBBBBBBBB)B", true, nullptr,
364 reinterpret_cast<void*>(trampoline_Java_Main_byteMethod) },
365 { "charMethod", "(CCCCCCCCCC)C", true, nullptr,
366 reinterpret_cast<void*>(trampoline_Java_Main_charMethod) },
367 { "shortMethod", "(SSSSSSSSSS)S", true, nullptr,
368 reinterpret_cast<void*>(trampoline_Java_Main_shortMethod) },
369 { "testCallStaticVoidMethodOnSubClassNative", "()V", true, nullptr,
370 reinterpret_cast<void*>(trampoline_Java_Main_testCallStaticVoidMethodOnSubClassNative) },
371 { "testFindClassOnAttachedNativeThread", "()V", true, nullptr,
372 reinterpret_cast<void*>(trampoline_Java_Main_testFindClassOnAttachedNativeThread) },
373 { "testFindFieldOnAttachedNativeThreadNative", "()V", true, nullptr,
374 reinterpret_cast<void*>(trampoline_Java_Main_testFindFieldOnAttachedNativeThreadNative) },
375 { "testGetMirandaMethodNative", "()Ljava/lang/reflect/Method;", true, nullptr,
376 reinterpret_cast<void*>(trampoline_Java_Main_testGetMirandaMethodNative) },
377 { "testNewStringObject", "()V", true, nullptr,
378 reinterpret_cast<void*>(trampoline_Java_Main_testNewStringObject) },
379 { "testZeroLengthByteBuffers", "()V", true, nullptr,
380 reinterpret_cast<void*>(trampoline_Java_Main_testZeroLengthByteBuffers) },
381 { "testSignal", "()I", true, nullptr,
382 reinterpret_cast<void*>(trampoline_Java_Main_testSignal) },
383 { "testSignalHandlerNotReturn", "()V", true, nullptr,
384 reinterpret_cast<void*>(trampoline_Java_Main_testSignalHandlerNotReturn) },
385 };
386
find_native_bridge_method(const char * name)387 static NativeBridgeMethod* find_native_bridge_method(const char *name) {
388 const char* pname = name;
389 if (strncmp(name, "Java_Main_", 10) == 0) {
390 pname += 10;
391 }
392
393 for (size_t i = 0; i < sizeof(gNativeBridgeMethods) / sizeof(gNativeBridgeMethods[0]); i++) {
394 if (strcmp(pname, gNativeBridgeMethods[i].name) == 0) {
395 return &gNativeBridgeMethods[i];
396 }
397 }
398 return nullptr;
399 }
400
401 // NativeBridgeCallbacks implementations
native_bridge_initialize(const android::NativeBridgeRuntimeCallbacks * art_cbs,const char * app_code_cache_dir,const char * isa ATTRIBUTE_UNUSED)402 extern "C" bool native_bridge_initialize(const android::NativeBridgeRuntimeCallbacks* art_cbs,
403 const char* app_code_cache_dir,
404 const char* isa ATTRIBUTE_UNUSED) {
405 struct stat st;
406 if (app_code_cache_dir != nullptr) {
407 if (stat(app_code_cache_dir, &st) == 0) {
408 if (!S_ISDIR(st.st_mode)) {
409 printf("Code cache is not a directory.\n");
410 }
411 } else {
412 perror("Error when stat-ing the code_cache:");
413 }
414 }
415
416 if (art_cbs != nullptr) {
417 gNativeBridgeArtCallbacks = art_cbs;
418 printf("Native bridge initialized.\n");
419 }
420 return true;
421 }
422
native_bridge_loadLibrary(const char * libpath,int flag)423 extern "C" void* native_bridge_loadLibrary(const char* libpath, int flag) {
424 if (strstr(libpath, "libinvalid.so") != nullptr) {
425 printf("Was to load 'libinvalid.so', force fail.\n");
426 return nullptr;
427 }
428 size_t len = strlen(libpath);
429 char* tmp = new char[len + 10];
430 strncpy(tmp, libpath, len);
431 tmp[len - 3] = '2';
432 tmp[len - 2] = '.';
433 tmp[len - 1] = 's';
434 tmp[len] = 'o';
435 tmp[len + 1] = 0;
436 void* handle = dlopen(tmp, flag);
437 delete[] tmp;
438
439 if (handle == nullptr) {
440 printf("Handle = nullptr!\n");
441 printf("Was looking for %s.\n", libpath);
442 printf("Error = %s.\n", dlerror());
443 char cwd[1024] = {'\0'};
444 if (getcwd(cwd, sizeof(cwd)) != nullptr) {
445 printf("Current working dir: %s\n", cwd);
446 }
447 }
448 return handle;
449 }
450
native_bridge_getTrampoline(void * handle,const char * name,const char * shorty,uint32_t len ATTRIBUTE_UNUSED)451 extern "C" void* native_bridge_getTrampoline(void* handle, const char* name, const char* shorty,
452 uint32_t len ATTRIBUTE_UNUSED) {
453 printf("Getting trampoline for %s with shorty %s.\n", name, shorty);
454
455 // The name here is actually the JNI name, so we can directly do the lookup.
456 void* sym = dlsym(handle, name);
457 NativeBridgeMethod* method = find_native_bridge_method(name);
458 if (method == nullptr)
459 return nullptr;
460 method->fnPtr = sym;
461
462 return method->trampoline;
463 }
464
native_bridge_isSupported(const char * libpath)465 extern "C" bool native_bridge_isSupported(const char* libpath) {
466 printf("Checking for support.\n");
467
468 if (libpath == nullptr) {
469 return false;
470 }
471 // We don't want to hijack javacore. So we should get libarttest...
472 return strcmp(libpath, "libjavacore.so") != 0;
473 }
474
475 namespace android {
476
477 // Environment values required by the apps running with native bridge.
478 struct NativeBridgeRuntimeValues {
479 const char* os_arch;
480 const char* cpu_abi;
481 const char* cpu_abi2;
482 const char* *supported_abis;
483 int32_t abi_count;
484 };
485
486 } // namespace android
487
488 const char* supported_abis[] = {
489 "supported1", "supported2", "supported3"
490 };
491
492 const struct android::NativeBridgeRuntimeValues nb_env {
493 .os_arch = "os.arch",
494 .cpu_abi = "cpu_abi",
495 .cpu_abi2 = "cpu_abi2",
496 .supported_abis = supported_abis,
497 .abi_count = 3
498 };
499
native_bridge_getAppEnv(const char * abi)500 extern "C" const struct android::NativeBridgeRuntimeValues* native_bridge_getAppEnv(
501 const char* abi) {
502 printf("Checking for getEnvValues.\n");
503
504 if (abi == nullptr) {
505 return nullptr;
506 }
507
508 return &nb_env;
509 }
510
511 // v2 parts.
512
native_bridge_isCompatibleWith(uint32_t bridge_version ATTRIBUTE_UNUSED)513 extern "C" bool native_bridge_isCompatibleWith(uint32_t bridge_version ATTRIBUTE_UNUSED) {
514 return true;
515 }
516
517 #if defined(__i386__) || defined(__x86_64__)
518 #if defined(__APPLE__)
519 #define ucontext __darwin_ucontext
520
521 #if defined(__x86_64__)
522 // 64 bit mac build.
523 #define CTX_EIP uc_mcontext->__ss.__rip
524 #else
525 // 32 bit mac build.
526 #define CTX_EIP uc_mcontext->__ss.__eip
527 #endif
528
529 #elif defined(__x86_64__)
530 // 64 bit linux build.
531 #define CTX_EIP uc_mcontext.gregs[REG_RIP]
532 #else
533 // 32 bit linux build.
534 #define CTX_EIP uc_mcontext.gregs[REG_EIP]
535 #endif
536 #endif
537
StandardSignalHandler(int sig,siginfo_t * info ATTRIBUTE_UNUSED,void * context)538 static bool StandardSignalHandler(int sig, siginfo_t* info ATTRIBUTE_UNUSED,
539 void* context) {
540 if (sig == SIGSEGV) {
541 #if defined(__arm__)
542 struct ucontext *uc = reinterpret_cast<struct ucontext*>(context);
543 struct sigcontext *sc = reinterpret_cast<struct sigcontext*>(&uc->uc_mcontext);
544 sc->arm_pc += 2; // Skip instruction causing segv & sigill.
545 #elif defined(__aarch64__)
546 struct ucontext *uc = reinterpret_cast<struct ucontext*>(context);
547 struct sigcontext *sc = reinterpret_cast<struct sigcontext*>(&uc->uc_mcontext);
548 sc->pc += 4; // Skip instruction causing segv & sigill.
549 #elif defined(__i386__)
550 struct ucontext *uc = reinterpret_cast<struct ucontext*>(context);
551 uc->CTX_EIP += 3;
552 #elif defined(__x86_64__)
553 struct ucontext *uc = reinterpret_cast<struct ucontext*>(context);
554 uc->CTX_EIP += 2;
555 #else
556 UNUSED(context);
557 #endif
558 }
559
560 // We handled this...
561 return true;
562 }
563
564 // A dummy special handler, continueing after the faulting location. This code comes from
565 // 004-SignalTest.
nb_signalhandler(int sig,siginfo_t * info,void * context)566 static bool nb_signalhandler(int sig, siginfo_t* info, void* context) {
567 printf("NB signal handler with signal %d.\n", sig);
568
569 if (gSignalTestStatus.Get() == TestStatus::kNone) {
570 return StandardSignalHandler(sig, info, context);
571 } else if (sig == SIGSEGV) {
572 return NotReturnSignalHandler();
573 } else {
574 printf("ERROR: should not reach here!\n");
575 return false;
576 }
577 }
578
native_bridge_getSignalHandler(int signal)579 static ::android::NativeBridgeSignalHandlerFn native_bridge_getSignalHandler(int signal) {
580 // Test segv for already claimed signal, and sigill for not claimed signal
581 if ((signal == SIGSEGV) || (signal == SIGILL)) {
582 return &nb_signalhandler;
583 }
584 return nullptr;
585 }
586
native_bridge_unloadLibrary(void * handle ATTRIBUTE_UNUSED)587 extern "C" int native_bridge_unloadLibrary(void* handle ATTRIBUTE_UNUSED) {
588 printf("dlclose() in native bridge.\n");
589 return 0;
590 }
591
native_bridge_getError()592 extern "C" const char* native_bridge_getError() {
593 printf("getError() in native bridge.\n");
594 return "";
595 }
596
native_bridge_isPathSupported(const char * library_path ATTRIBUTE_UNUSED)597 extern "C" bool native_bridge_isPathSupported(const char* library_path ATTRIBUTE_UNUSED) {
598 printf("Checking for path support in native bridge.\n");
599 return false;
600 }
601
native_bridge_initAnonymousNamespace(const char * public_ns_sonames ATTRIBUTE_UNUSED,const char * anon_ns_library_path ATTRIBUTE_UNUSED)602 extern "C" bool native_bridge_initAnonymousNamespace(const char* public_ns_sonames ATTRIBUTE_UNUSED,
603 const char* anon_ns_library_path ATTRIBUTE_UNUSED) {
604 printf("Initializing anonymous namespace in native bridge.\n");
605 return false;
606 }
607
608 extern "C" android::native_bridge_namespace_t*
native_bridge_createNamespace(const char * name ATTRIBUTE_UNUSED,const char * ld_library_path ATTRIBUTE_UNUSED,const char * default_library_path ATTRIBUTE_UNUSED,uint64_t type ATTRIBUTE_UNUSED,const char * permitted_when_isolated_path ATTRIBUTE_UNUSED,android::native_bridge_namespace_t * parent_ns ATTRIBUTE_UNUSED)609 native_bridge_createNamespace(const char* name ATTRIBUTE_UNUSED,
610 const char* ld_library_path ATTRIBUTE_UNUSED,
611 const char* default_library_path ATTRIBUTE_UNUSED,
612 uint64_t type ATTRIBUTE_UNUSED,
613 const char* permitted_when_isolated_path ATTRIBUTE_UNUSED,
614 android::native_bridge_namespace_t* parent_ns ATTRIBUTE_UNUSED) {
615 printf("Creating namespace in native bridge.\n");
616 return nullptr;
617 }
618
native_bridge_linkNamespaces(android::native_bridge_namespace_t * from ATTRIBUTE_UNUSED,android::native_bridge_namespace_t * to ATTRIBUTE_UNUSED,const char * shared_libs_sonames ATTRIBUTE_UNUSED)619 extern "C" bool native_bridge_linkNamespaces(android::native_bridge_namespace_t* from ATTRIBUTE_UNUSED,
620 android::native_bridge_namespace_t* to ATTRIBUTE_UNUSED,
621 const char* shared_libs_sonames ATTRIBUTE_UNUSED) {
622 printf("Linking namespaces in native bridge.\n");
623 return false;
624 }
625
native_bridge_loadLibraryExt(const char * libpath ATTRIBUTE_UNUSED,int flag ATTRIBUTE_UNUSED,android::native_bridge_namespace_t * ns ATTRIBUTE_UNUSED)626 extern "C" void* native_bridge_loadLibraryExt(const char* libpath ATTRIBUTE_UNUSED,
627 int flag ATTRIBUTE_UNUSED,
628 android::native_bridge_namespace_t* ns ATTRIBUTE_UNUSED) {
629 printf("Loading library with Extension in native bridge.\n");
630 return nullptr;
631 }
632
633 // "NativeBridgeItf" is effectively an API (it is the name of the symbol that will be loaded
634 // by the native bridge library).
635 android::NativeBridgeCallbacks NativeBridgeItf {
636 // v1
637 .version = 3,
638 .initialize = &native_bridge_initialize,
639 .loadLibrary = &native_bridge_loadLibrary,
640 .getTrampoline = &native_bridge_getTrampoline,
641 .isSupported = &native_bridge_isSupported,
642 .getAppEnv = &native_bridge_getAppEnv,
643 // v2
644 .isCompatibleWith = &native_bridge_isCompatibleWith,
645 .getSignalHandler = &native_bridge_getSignalHandler,
646 // v3
647 .unloadLibrary = &native_bridge_unloadLibrary,
648 .getError = &native_bridge_getError,
649 .isPathSupported = &native_bridge_isPathSupported,
650 .initAnonymousNamespace = &native_bridge_initAnonymousNamespace,
651 .createNamespace = &native_bridge_createNamespace,
652 .linkNamespaces = &native_bridge_linkNamespaces,
653 .loadLibraryExt = &native_bridge_loadLibraryExt
654 };
655