android 逆向 smali手写helloworld

编写Hello.smali文件

.class public LHelloWorld;
.super Ljava/lang/Object;
.method public static main([Ljava/lang/String;)V
	.registers 4
	.parameter
	.prologue
	nop
	nop
	const/16 v0, 0x8
	const/4 v1, 0x5
	const/4 v2, 0x3
	# 创造一个v0数值的int类型数组, 并将引用赋给v0
	new-array v0, v0, [I
	array-length v1, v0
	# 创建一个StringBuilder实例，引用赋给v1
	new-instance v1, Ljava/lang/StringBuilder;
	invoke-direct {v1}, Ljava/lang/StringBuilder;-><init>()V
	#如果v0的值不为0，则跳转到cond_0
	if-nez v0, :cond_0
	goto :goto_0
	:cond_0
	#数据转换指令
	int-to-float v2, v2
	#数据运算指令
	add-float v2, v2, v2
	#比较指令
	cmpl-float v0, v2, v2
	# 将静态System对象的out对象引用赋给v0
	sget-object v0, Ljava/lang/System;->out:Ljava/io/PrintStream;
	const-string v1, "Hello jianggiegie"
	# 调用v0的println，入参是v1
	invoke-virtual {v0, v1}, Ljava/io/PrintStream;->println(Ljava/lang/String;)V
	:goto_0
	return-void
.end method

执行编译命令

java -jar smali.jar -o hello.dex Hello.smali

将dex 推入手机/sdcard 下

adb push hello.dex /sdcard/

手机中执行命令

dalvikvm -cp hello.dex HelloWorld

打印 jianggeigei