win10下ndk编译arm可执行体

编译参考文章

http://blog.csdn.net/john_1984/article/details/12622215

一、编写soLoader主文件

soLoader.c内容：

#include <stdio.h>
typedef int (*MAIN_FN)(int,char**);
int main(int argc,char* argv[]){
    printf("hello so!\n");
    int ret = dlopen("/data/local/xxx.so");
    if (ret==)
    {
        printf("file not found!\n");
    }
    void* pfn = dlsym(ret,"main");
    if (pfn==NULL)
    {
        printf("method \"main\" not found!\n");
    }
    ((MAIN_FN)pfn)(argc,argv);
    printf("result: %x\n",ret);

}

二、编译o文件

E:\Documents\Android\sdk\ndk-bundle\toolchains\arm-linux-androideabi-4.9\prebuilt\windows-x86_64\bin>arm-linux-androideabi-gcc.exe --sysroot=E:\Documents\Android\sdk\ndk-bundle\platforms\android-\arch-arm -o E:\VMShare\Work\Andriod\antidebug\soLoader\jni\soLoader.o -c E:\VMShare\Work\Andriod\antidebug\soLoader\jni\soLoader.c

三、链接o文件为elf文件

E:\Documents\Android\sdk\ndk-bundle\toolchains\arm-linux-androideabi-4.9\prebuilt\windows-x86_64\bin>arm-linux-androideabi-gcc.exe --sysroot=E:\Documents\Android\sdk\ndk-bundle\platforms\android-\arch-arm -o E:\VMShare\Work\Andriod\antidebug\soLoader\jni\soLoader E:\VMShare\Work\Andriod\antidebug\soLoader\jni\soLoader.o

 或者直接编译链接（二，三命令合并）：

E:\Documents\Android\sdk\ndk-bundle\toolchains\arm-linux-androideabi-4.9\prebuilt\windows-x86_64\bin>arm-linux-androideabi-gcc.exe --sysroot=E:\Documents\Android\sdk\ndk-bundle\platforms\android-\arch-arm -o E:\VMShare\Work\Andriod\antidebug\soLoader\jni\soLoader E:\VMShare\Work\Andriod\antidebug\soLoader\jni\soLoader.c

四、push到手机，执行

//pc端命令
E:\VMShare\Work\Andriod\antidebug\soLoader\jni>adb push soLoader /data/local/tmp
//adb shell
shell@hammerhead:/data/local/tmp # chmod  soLoader
shell@hammerhead:/data/local/tmp # ./soLoader
hello so!
file not found!
method "main" not found!
[] + Stopped (signal)     ./soLoader
shell@hammerhead:/data/local/tmp # ls

　　　　　　　　

===========第二种简单的利用Android.mk文件自动生成elf（eclipse的ndk自动插件）============

也可在Eclipse下创建android工程，Android Tools -> Add Native Support...，利用配置好的ndk环境编译链接生成elf文件。

参考文章

http://sodino.com/2015/01/12/dlopen-usage-demo/

为了方便编译生成so及binary，仍然在Eclipse+CDT+NDK环境中构建。
工程结构图如下：

comparison.c将编译生成待加载的动态链接库libComparison.so，其代码如下：

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#ifndef _Comparison_c #define _Comparison_c   int max (int a, int b) { return a > b? a : b; }   #endif

Execute.c将编译生成可在Android中直接运行的可执行文件。其代码如下：

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#include<stdio.h> #include<dlfcn.h>   int main(void) { // 必须写明绝对路径，否则找不着so文件呢 void *handle = dlopen("/data/local/libComparison.so",RTLD_LAZY); int(*pfun)(int,int); const char *error = NULL;   if(handle==NULL) { printf("error:dlopen libComparison.so Fail.\n"); return 1; }   dlerror(); pfun = dlsym(handle,"max"); if((error=dlerror()) != NULL) { printf("error:dlsym method max fail.\n"); return 1; }   printf("input tow number:\n");   int a, b; scanf("%d%d", &a, &b);   int result = (*pfun)(a, b);   printf("Get:%d and %d, the max() return:%d\n",a, b, result);   dlclose(handle);   return 0; }

Android.mk的作用在于声明配置并分别生成libComparison.so及Execute(binary)。其代码如下：

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LOCAL_PATH := $(call my-dir)   include $(CLEAR_VARS)   LOCAL_MODULE := Execute LOCAL_SRC_FILES := Execute.c #生成独立的可执行文件 include $(BUILD_EXECUTABLE)     include $(CLEAR_VARS)   LOCAL_MODULE := Comparison LOCAL_SRC_FILES := comparison.c #普通的so库 include $(BUILD_SHARED_LIBRARY)

右击工程 -> Build Project。则在libs下生成了libComparison.so及Execute(binary)。
使用ADB命令将这两个文件push到手机。并执行操作查看效果如下图：

==========第三种简单的利用Android.mk文件自动生成elf（eclipse手动添加jni环境）==========

手动添加好jni文件夹，配置好Android.mk和Application.mk后，手动切换ndk-build.cmd到工程的jni目录，编译执行（手动添加ndkbuilder的本质）

PS E:\Documents\workspace\CydiaModuleSo\jni> E:\Documents\Android\sdk\ndk-bundle\ndk-build.cmd
Android NDK: WARNING: APP_PLATFORM android- is higher than android:minSdkVersion  in E:/Documents/workspace/CydiaModuleSo/AndroidManifest.xml. NDK binaries will *not* be comptible with devices older than android-. See https://android.googlesource.com/platform/ndk/+/master/docs/user/common_problems.md for more information.
Android NDK: WARNING:E:/Documents/workspace/CydiaModuleSo/jni/Android.mk:test.cy: non-system libraries in linker flags: -lsubstrate-dvm -lsubstrate
Android NDK:     This is likely to result in incorrect builds. Try using LOCAL_STATIC_LIBRARIES
Android NDK:     or LOCAL_SHARED_LIBRARIES instead to list the library dependencies of the
Android NDK:     current module
[armeabi-v7a] Prebuilt       : libsubstrate.so <= jni/
[armeabi-v7a] Install        : libsubstrate.so => libs/armeabi-v7a/libsubstrate.so
[armeabi-v7a] Prebuilt       : libsubstrate-dvm.so <= jni/
[armeabi-v7a] Install        : libsubstrate-dvm.so => libs/armeabi-v7a/libsubstrate-dvm.so
[armeabi-v7a] Compile++ arm  : test.cy <= test.cpp
In file included from E:/Documents/workspace/CydiaModuleSo/jni/test.cpp::
E:/Documents/workspace/CydiaModuleSo/jni/substrate.h::: warning: variadic templates are a C++ extension
      [-Wc++-extensions]
template <typename Type_, typename Kind_, typename ...Args_>
                                                   ^
E:/Documents/workspace/CydiaModuleSo/jni/test.cpp::: warning: format specifies type 'unsigned int' but the argument
      has type 'void *' [-Wformat]
                LOGD("dvm image: 0x%08X", (void* )image);
                                   ~~~~   ^~~~~~~~~~~~~
E:/Documents/workspace/CydiaModuleSo/jni/test.cpp::: note: expanded from macro 'LOGD'
#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, TAG, __VA_ARGS__)
                                                              ^~~~~~~~~~~
 warnings generated.
[armeabi-v7a] StaticLibrary  : libstdc++.a
[armeabi-v7a] SharedLibrary  : libtest.cy.so
[armeabi-v7a] Install        : libtest.cy.so => libs/armeabi-v7a/libtest.cy.so