Smali语法DalvikVM运codeS [英] Smali syntax for DalvikVM opcodes

问题描述

我想了解如何使用Smali / Baksmali组装/分解为DEX文件DalvikVM说明。

I am trying to learn about DalvikVM instructions using the Smali/Baksmali assembler/disassembler for dex files.

从这个.java文件

package gd;

class Hello {
    public static void main(String[] args)
    {
      System.out.println("Hello!");
    }
}

我已经生成以下smali汇编文件：

I have generated the following smali assembly file:

.class Lgd/Hello;
.super Ljava/lang/Object;
.source "Hello.java"


# direct methods
.method constructor <init>()V
    .registers 1

    .prologue
    .line 3
    invoke-direct {p0}, Ljava/lang/Object;-><init>()V

    return-void
.end method

.method public static main([Ljava/lang/String;)V
    .registers 3
    .parameter

    .prologue
    .line 6
    sget-object v0, Ljava/lang/System;->out:Ljava/io/PrintStream;

    const-string v1, "Hello!"

    invoke-virtual {v0, v1}, Ljava/io/PrintStream;->println(Ljava/lang/String;)V

    .line 7
    return-void
.end method

我的问题是关于下面一行。

My question is about the following line.

sget-object v0, Ljava/lang/System;->out:Ljava/io/PrintStream;

据我了解这个加载静态对象的PrintStream 的 java.lang.System中的类成的 V0 注册。现在，这是什么出来：的意思是

As I understand this loads the static object PrintStream of the java.lang.System class into the v0 register. Now, what does this out: mean?

推荐答案

的PrintStream实际上是被加载的东西的类型。您正在加载的对象可能被称为 java.lang.System.out ，其中的java.lang 是包，系统是类，而退出是要装载的部件（静态字段）。

PrintStream is actually the type of the thing being loaded. The object you're loading might be referred to as java.lang.System.out, where java.lang is the package, System is the class, and out is the member (a static field) to be loaded.

您可以看到在调用虚拟相同的模式： java.io 的包，的PrintStream 是类和的println 是部件（在这种情况下，一个实例方法）。在这两种情况下，该成员是一个 pceded $ P $ - ＆GT; 。我不知道这种模式在整个Smali一致的。

You can see the same pattern in the invoke-virtual: java.io is the package, PrintStream is the class and println is the member (in this case, an instance method). In both cases, the member is preceded with a ->. I don't know if this pattern is consistent throughout Smali.

我发现 http://source.android.com/高科技/达尔维克/ Dalvik的字节code.html当我与Dalvik的东西玩，但在这种情况下，它的贡献只是标识sget对象宝贵只花了两个参数。这告诉我， - ＆GT;的：业务必须是静态字段引用的一部分

I found http://source.android.com/tech/dalvik/dalvik-bytecode.html invaluable when I was playing with dalvik stuff, although in this case its contribution was just identifying that sget-object only took two arguments. That told me the ->out: business had to be part of the static field reference.

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