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12章内容提交
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@ -1315,39 +1315,8 @@ I/xunwind_tag: #06 pc 0000000000222248 /apex/com.android.art/lib64/libart.so (a
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I/xunwind_tag: #07 pc 0000000000218bec /apex/com.android.art/lib64/libart.so (art_quick_invoke_static_stub+572)
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I/xunwind_tag: #08 pc 0000000000290300 /apex/com.android.art/lib64/libart.so (_ZN3art9ArtMethod6InvokeEPNS_6ThreadEPjjPNS_6JValueEPKc+536)
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I/xunwind_tag: #09 pc 00000000003f09e4 /apex/com.android.art/lib64/libart.so (_ZN3art11interpreter34ArtInterpreterToCompiledCodeBridgeEPNS_6ThreadEPNS_9ArtMethodEPNS_11ShadowFrameEtPNS_6JValueE+404)
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I/xunwind_tag: #10 pc 00000000003eb858 /apex/com.android.art/lib64/libart.so (_ZN3art11interpreter6DoCallILb0ELb0EEEbPNS_9ArtMethodEPNS_6ThreadERNS_11ShadowFrameEPKNS_11InstructionEtPNS_6JValueE+808)
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I/xunwind_tag: #11 pc 00000000007658d0 /apex/com.android.art/lib64/libart.so (MterpInvokeStatic+984)
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I/xunwind_tag: #12 pc 0000000000203998 /apex/com.android.art/lib64/libart.so (mterp_op_invoke_static+24)
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I/xunwind_tag: #13 pc 00000000003e3688 /apex/com.android.art/lib64/libart.so (_ZN3art11interpreterL7ExecuteEPNS_6ThreadERKNS_20CodeItemDataAccessorERNS_11ShadowFrameENS_6JValueEbb+348)
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I/xunwind_tag: #14 pc 000000000074920c /apex/com.android.art/lib64/libart.so (artQuickToInterpreterBridge+780)
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I/xunwind_tag: #15 pc 000000000022237c /apex/com.android.art/lib64/libart.so (art_quick_to_interpreter_bridge+92)
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I/xunwind_tag: #16 pc 000000000021160c /apex/com.android.art/lib64/libart.so (nterp_helper+156)
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I/xunwind_tag: #17 pc 0000000000218968 /apex/com.android.art/lib64/libart.so (art_quick_invoke_stub+552)
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I/xunwind_tag: #18 pc 00000000002902d4 /apex/com.android.art/lib64/libart.so (_ZN3art9ArtMethod6InvokeEPNS_6ThreadEPjjPNS_6JValueEPKc+492)
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I/xunwind_tag: #19 pc 000000000062ba5c /apex/com.android.art/lib64/libart.so (_ZN3art12InvokeMethodILNS_11PointerSizeE8EEEP8_jobjectRKNS_33ScopedObjectAccessAlreadyRunnableES3_S3_S3_m+1388)
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I/xunwind_tag: #20 pc 000000000059d2f8 /apex/com.android.art/lib64/libart.so (_ZN3artL13Method_invokeEP7_JNIEnvP8_jobjectS3_P13_jobjectArray+56)
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I/xunwind_tag: #21 pc 0000000000222248 /apex/com.android.art/lib64/libart.so (art_quick_generic_jni_trampoline+152)
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I/xunwind_tag: #22 pc 0000000000212524 /apex/com.android.art/lib64/libart.so (nterp_helper+4020)
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I/xunwind_tag: #23 pc 00000000002132e8 /apex/com.android.art/lib64/libart.so (nterp_helper+7544)
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I/xunwind_tag: #24 pc 00000000002124c8 /apex/com.android.art/lib64/libart.so (nterp_helper+3928)
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I/xunwind_tag: #25 pc 00000000002124c8 /apex/com.android.art/lib64/libart.so (nterp_helper+3928)
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I/xunwind_tag: #26 pc 00000000002115a8 /apex/com.android.art/lib64/libart.so (nterp_helper+56)
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I/xunwind_tag: #27 pc 00000000002132e8 /apex/com.android.art/lib64/libart.so (nterp_helper+7544)
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I/xunwind_tag: #28 pc 00000000002115a8 /apex/com.android.art/lib64/libart.so (nterp_helper+56)
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I/xunwind_tag: #29 pc 00000000002124c8 /apex/com.android.art/lib64/libart.so (nterp_helper+3928)
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I/xunwind_tag: #30 pc 00000000002115a8 /apex/com.android.art/lib64/libart.so (nterp_helper+56)
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I/xunwind_tag: #31 pc 00000000002115a8 /apex/com.android.art/lib64/libart.so (nterp_helper+56)
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I/xunwind_tag: #32 pc 0000000000218bec /apex/com.android.art/lib64/libart.so (art_quick_invoke_static_stub+572)
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I/xunwind_tag: #33 pc 0000000000290300 /apex/com.android.art/lib64/libart.so (_ZN3art9ArtMethod6InvokeEPNS_6ThreadEPjjPNS_6JValueEPKc+536)
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I/xunwind_tag: #34 pc 000000000062ba5c /apex/com.android.art/lib64/libart.so (_ZN3art12InvokeMethodILNS_11PointerSizeE8EEEP8_jobjectRKNS_33ScopedObjectAccessAlreadyRunnableES3_S3_S3_m+1388)
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I/xunwind_tag: #35 pc 000000000059d2f8 /apex/com.android.art/lib64/libart.so (_ZN3artL13Method_invokeEP7_JNIEnvP8_jobjectS3_P13_jobjectArray+56)
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I/xunwind_tag: #36 pc 0000000000222248 /apex/com.android.art/lib64/libart.so (art_quick_generic_jni_trampoline+152)
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I/xunwind_tag: #37 pc 0000000000212524 /apex/com.android.art/lib64/libart.so (nterp_helper+4020)
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I/xunwind_tag: #38 pc 00000000002132e8 /apex/com.android.art/lib64/libart.so (nterp_helper+7544)
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I/xunwind_tag: #39 pc 0000000000218bec /apex/com.android.art/lib64/libart.so (art_quick_invoke_static_stub+572)
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I/xunwind_tag: #40 pc 0000000000290300 /apex/com.android.art/lib64/libart.so (_ZN3art9ArtMethod6InvokeEPNS_6ThreadEPjjPNS_6JValueEPKc+536)
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I/xunwind_tag: #41 pc 000000000062c1b4 /apex/com.android.art/lib64/libart.so (_ZN3art17InvokeWithVarArgsIPNS_9ArtMethodEEENS_6JValueERKNS_33ScopedObjectAccessAlreadyRunnableEP8_jobjectT_St9__va_list+452)
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I/xunwind_tag: #42 pc 000000000062c678 /apex/com.android.art/lib64/libart.so (_ZN3art17InvokeWithVarArgsIP10_jmethodIDEENS_6JValueERKNS_33ScopedObjectAccessAlreadyRunnableEP8_jobjectT_St9__va_list+96)
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...
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...
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I/xunwind_tag: #43 pc 0000000000507c68 /apex/com.android.art/lib64/libart.so (_ZN3art3JNIILb1EE21CallStaticVoidMethodVEP7_JNIEnvP7_jclassP10_jmethodIDSt9__va_list+620)
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I/xunwind_tag: #44 pc 00000000000aeac8 /system/lib64/libandroid_runtime.so (_ZN7_JNIEnv20CallStaticVoidMethodEP7_jclassP10_jmethodIDz+124)
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I/xunwind_tag: #45 pc 00000000000ba060 /system/lib64/libandroid_runtime.so (_ZN7android14AndroidRuntime5startEPKcRKNS_6VectorINS_7String8EEEb+840)
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@ -1364,8 +1333,321 @@ I/xunwind_tag: >>> finished <<<
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* 优化获取调用栈信息的代码，让其结果仅输出想要关注的目标动态库的调用栈。
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* 直接输出日志调整为返回调用栈字符串。
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新建`native`的项目，将`xUnwind`的样例`apk`解压后，取出其`lib`目录中的依赖动态库，将其复制到新项目的`libs`目录中，如下图。
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首先将`xUnwind`中的样例`apk`解压，找到`lib`目录查看其依赖的动态库，分别是`libxdl.so、libxunwind.so`。在源码中能看到`libxunwind.so`中使用`libxdl.so`来查询指定地址对应的动态库信息。所以在加载动态库时，需要优先加载`libxdl.so`。
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新建`native`的项目，将`libxdl.so、libxunwind.so`复制到新项目的`libs`目录中，然后修改`build.gradle`文件如下。
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```
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android {
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...
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defaultConfig {
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...
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ndk {
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abiFilters 'arm64-v8a'
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}
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...
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}
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...
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sourceSets {
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main {
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jniLibs.srcDirs = ['libs']
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}
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}
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...
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}
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```
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然后添加测试代码如下。
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```java
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public class MainActivity extends AppCompatActivity {
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// 注入三个动态库
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static {
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System.loadLibrary("xdl");
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System.loadLibrary("xunwind");
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System.loadLibrary("nativecppdemo");
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}
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private ActivityMainBinding binding;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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binding = ActivityMainBinding.inflate(getLayoutInflater());
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setContentView(binding.getRoot());
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TextView tv = binding.sampleText;
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tv.setText(stringFromJNI());
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}
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public native String stringFromJNI();
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}
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```
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然后在`stringFromJNI`函数调时，获取调用栈，参考样例中的代码，并删除非`EH`方案的代码。创建一个存放头文件`kbacktrace.h`，内容如下。
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```c++
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#ifndef __KBACKTRACE_H__
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#define __KBACKTRACE_H__
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#include <sys/wait.h>
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void sigabrt_handler(int signum, siginfo_t *siginfo, void *context);
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void signal_register(void);
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const char* kbacktrace(bool with_context,const char* moduleName);
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#endif
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```
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接着创建一个对应的源码文件`kbacktrace.cpp`，优化后的内容如下。
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```c++
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#include "kbacktrace.h"
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#include <string>
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#include <unistd.h>
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#include "xunwind.h"
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#include <setjmp.h>
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static bool g_with_context = false;
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static uintptr_t g_frames[128];
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static size_t g_frames_sz = 0;
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void sigabrt_handler(int signum, siginfo_t *siginfo, void *context) {
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(void)signum, (void)siginfo;
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// EH local unwind
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size_t frames_sz = xunwind_eh_unwind(g_frames, sizeof(g_frames) / sizeof(g_frames[0]),
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g_with_context ? context : NULL);
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__atomic_store_n(&g_frames_sz, frames_sz, __ATOMIC_SEQ_CST);
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}
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void signal_register(void) {
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struct sigaction act;
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memset(&act, 0, sizeof(act));
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sigfillset(&act.sa_mask);
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sigdelset(&act.sa_mask, SIGSEGV);
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act.sa_sigaction = sigabrt_handler;
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act.sa_flags = SA_RESTART | SA_SIGINFO | SA_ONSTACK;
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sigaction(SIGABRT, &act, NULL);
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}
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const char* kbacktrace(bool with_context,const char* moduleName) {
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g_with_context = with_context;
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__atomic_store_n(&g_frames_sz, 0, __ATOMIC_SEQ_CST);
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tgkill(getpid(), gettid(), SIGABRT);
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if ( __atomic_load_n(&g_frames_sz, __ATOMIC_SEQ_CST) > 0){
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const char* res= xunwind_frames_get(g_frames, g_frames_sz,nullptr,moduleName);
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return res;
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}
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return "";
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}
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```
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在原来的样例中有两种信号方式获取调用栈，内置在`AOSP`中固定使用一种方式即可，所以仅保留`SIGABRT`信号获取堆栈即可。接着就可以使用该函数获取调用栈了。示例如下。
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```c++
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#include <jni.h>
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#include <android/log.h>
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#include "kbacktrace.h"
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#define TAG "mikrom"
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#define LOG_PRIORITY ANDROID_LOG_INFO
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#define ALOGI(fmt, ...) __android_log_print(LOG_PRIORITY, TAG, fmt, ##__VA_ARGS__)
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extern "C" JNIEXPORT jstring JNICALL
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Java_com_mik_nativecppdemo_MainActivity_stringFromJNI(
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JNIEnv* env,
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jobject obj /* this */) {
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jstring resObj=env->NewStringUTF("test");
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const char* res= kbacktrace(true,"libnativecppdemo.so");
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ALOGI("-------------------------Backtrace-------------------------\n%s",res);
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return resObj;
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}
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// 在动态库加载时调用，完成本地方法的注册
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JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *, void *) {
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signal_register();
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return JNI_VERSION_1_6;
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}
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```
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修改完样例后，动态库中的`xunwind_frames_get`函数也需要调整，为其新增参数，将动态库名称传递进去，让其仅返回包含该动态库名称的调用栈。修改如下。
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```c++
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char *xunwind_frames_get(uintptr_t *frames, size_t frames_sz, const char *prefix,const char* moduleName) {
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xu_printer_t printer;
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xu_printer_init_get(&printer);
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xu_formatter_print(frames, frames_sz, prefix, &printer,moduleName);
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return xu_printer_get(&printer);
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}
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```
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继续修改`xu_formatter_print`函数，添加对动态库的过滤。
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```c++
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void xu_formatter_print(uintptr_t *frames, size_t frames_sz, const char *prefix, xu_printer_t *printer,const char* moduleName) {
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if (NULL == frames || 0 == frames_sz) return;
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if (NULL == prefix) prefix = "";
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void *cache = NULL;
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xdl_info_t info;
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for (size_t i = 0; i < frames_sz; i++) {
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memset(&info, 0, sizeof(xdl_info_t));
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int r = 0;
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if (0 != frames[i]) {
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// find info from linker
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r = xdl_addr((void *)(frames[i]), &info, &cache);
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// 非目标动态库，则直接跳过
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if(!strstr(info.dli_fname,moduleName)){
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continue;
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}
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// find info from maps
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char buf[512];
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if (0 == r || (uintptr_t)info.dli_fbase > frames[i])
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r = xu_formatter_maps_addr(frames[i], &info, buf, sizeof(buf));
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}
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...
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}
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xdl_addr_clean(&cache);
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}
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```
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完成修改后，编译时发现错误，是因为没有指定依赖的动态库，修改`CMakeLists`文件如下。
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```cmake
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if(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64*")
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# 当前 CPU 架构为 arm64
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target_link_libraries( # Specifies the target library.
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kbacktrace
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${PROJECT_SOURCE_DIR}/../../../../app/libs/arm64-v8a/libxunwind.so
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# Links the target library to the log library
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# included in the NDK.
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${log-lib})
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endif()
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if(CMAKE_SYSTEM_PROCESSOR MATCHES "arm*")
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if(CMAKE_SYSTEM_PROCESSOR MATCHES "v7*")
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# 当前 CPU 架构为 armeabi-v7a
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target_link_libraries( # Specifies the target library.
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kbacktrace
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${PROJECT_SOURCE_DIR}/../../../../app/libs/armeabi-v7a/libxunwind.so
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# Links the target library to the log library
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# included in the NDK.
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${log-lib})
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endif()
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endif()
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```
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最后运行这个新的测试样例，输出日志如下。
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```
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com.mik.nativecppdemo I -------------------------Backtrace-------------------------
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#01 pc 000000000001e02c /data/app/~~-XZEZm9rvOBJhceZK8LuKg==/com.mik.nativecppdemo-SoSNN-J1eghWN4JW7rNYqw==/base.apk!/lib/arm64-v8a/libnativecppdemo.so
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#02 pc 000000000001dd74 /data/app/~~-XZEZm9rvOBJhceZK8LuKg==/com.mik.nativecppdemo-SoSNN-J1eghWN4JW7rNYqw==/base.apk!/lib/arm64-v8a/libnativecppdemo.so (Java_com_mik_nativecppdemo_MainActivity_stringFromJNI+180)
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```
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### 12.6.3 内置获取调用栈
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在测试样例中将主要功能逻辑完成后，最后需要将该功能内置到`AOSP`中，提供`JNI`中打桩函数调用。首先是将`libxdl.so、libxunwind.so、libkbacktrace.so`动态库内置到系统目录中。
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在`AOSP`源码目录`frameworks/base/packages/apps/`下新建目录，用于存放内置的动态库，然后将样例程序`armeabi-v7a`和`arm64-v8`中的动态库放在新目录下。在新目录下添加规则文件`Android.mk`。内容如下。
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```
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#--------------------------------
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include $(CLEAR_VARS)
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LOCAL_MODULE := libxdl
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LOCAL_SRC_FILES_arm := libxdl.so
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LOCAL_SRC_FILES_arm64 := libxdl_arm64.so
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LOCAL_MODULE_TARGET_ARCHS:= arm arm64
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LOCAL_MULTILIB := both
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LOCAL_MODULE_SUFFIX := .so
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LOCAL_MODULE_CLASS := SHARED_LIBRARIES
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LOCAL_MODULE_TAGS := optional
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LOCAL_SHARED_LIBRARIES := liblog
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include $(BUILD_PREBUILT)
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#--------------------------------
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include $(CLEAR_VARS)
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LOCAL_MODULE := libxunwind
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LOCAL_SRC_FILES_arm := libxunwind.so
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LOCAL_SRC_FILES_arm64 := libxunwind_arm64.so
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LOCAL_MODULE_TARGET_ARCHS:= arm arm64
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LOCAL_MULTILIB := both
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LOCAL_MODULE_SUFFIX := .so
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LOCAL_MODULE_CLASS := SHARED_LIBRARIES
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LOCAL_MODULE_TAGS := optional
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LOCAL_SHARED_LIBRARIES := liblog libxdl
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include $(BUILD_PREBUILT)
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#--------------------------------
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include $(CLEAR_VARS)
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LOCAL_MODULE := libkbacktrace
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LOCAL_SRC_FILES_arm := libkbacktrace.so
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LOCAL_SRC_FILES_arm64 := libkbacktrace_arm64.so
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LOCAL_MODULE_TARGET_ARCHS:= arm arm64
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LOCAL_MULTILIB := both
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LOCAL_MODULE_SUFFIX := .so
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LOCAL_MODULE_CLASS := SHARED_LIBRARIES
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LOCAL_MODULE_TAGS := optional
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LOCAL_SHARED_LIBRARIES := liblog libxunwind
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include $(BUILD_PREBUILT)
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```
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然后在文件`build/make/target/product/generic_system.mk`中添加这模块。
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|
||||
```
|
||||
PRODUCT_PACKAGES += \
|
||||
libxdl \
|
||||
libxunwind \
|
||||
libkbacktrace \
|
||||
```
|
||||
|
||||
编译刷入手机后，即可在系统动态库目录中找到内置进去的动态库。接下来在应用的启动阶段，判断其是否为目标应用，是目标应用则按顺序加载动态库，所以下面回到在前面准备好的读取配置的测试代码。
|
||||
|
||||
```java
|
||||
public static void loadBlackTraceSo(){
|
||||
System.loadLibrary("xdl");
|
||||
System.loadLibrary("xunwind");
|
||||
System.loadLibrary("kbacktrace");
|
||||
}
|
||||
|
||||
@Override
|
||||
protected void onCreate(Bundle savedInstanceState) {
|
||||
super.onCreate(savedInstanceState);
|
||||
...
|
||||
// 判断当前app是否为目标应用
|
||||
PackageItem currentItem=null;
|
||||
for(PackageItem item : packageItems){
|
||||
if(item.packageName.contains(this.getPackageName())){
|
||||
currentItem=item;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if(currentItem==null){
|
||||
return;
|
||||
}
|
||||
if(currentItem.isJNIMethodPrint){
|
||||
loadBlackTraceSo();
|
||||
}
|
||||
...
|
||||
}
|
||||
```
|
||||
|
||||
最后在`JNI`打桩函数的结尾获取调用栈信息，
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user