CSKY CVM jni环境搭建

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1、编译CVM

2、在cvm/cdc/src/share/cdc/demo/cdc/HelloWorld.java中，

package cdc;public class HelloWorld {+    private static native void testprintf();    public static void main(String args[]) {System.out.println("Hello world!!!!!!!!!!.");+testprintf();    }+    static {+        System.loadLibrary("testprintf");+    }}

3、生成.class

$ javac HelloWorld.java

4、生成头文件：

javah -jni cdc/HelloWorld

5、动态库：

$ testprintf.c

#include <jni.h>#include "cdc_HelloWorld.h"#include <stdio.h>void func(void){volatile long long num = 0x1122334455667788;printf("%llx\n", num);return;}JNIEXPORT void JNICALL Java_cdc_HelloWorld_testprintf (JNIEnv *env, jobject obj){volatile long long num1 = 0x1122334455667788;volatile double num2 = 0.123456789;printf("%llx %lf\n", num1, num2);func();return;}

编译动态库

/tools/csky/csky-tools/uclibc/csky-linux-tools-x86_64/bin/csky-linux-gcc -I/usr/lib/gcc/x86_64-redhat-linux/3.4.3/include -c -o testprintf.o testprintf.c -fPIC/tools/csky/csky-tools/uclibc/csky-linux-tools-x86_64/bin/csky-linux-gcc -shared -o libtestprintf.so testprintf.o -fPICcp libtestprintf.so /home/rtos_nfs/chenlf/rootfsle2/lib/

6、运行：

$ mkdir rootfs/cdc-cvm_1.2-linux_cskyv1_ck610-bin/cdc$ cd rootfs/cdc-cvm_1.2-linux_cskyv1_ck610-bin/$ cp cdc/HelloWorld.class rootfs/cdc-cvm_1.2-linux_cskyv1_ck610-bin/cdc$ ./bin/cvm cdc.HelloWorld

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