arm thumb bl  格式

悉下thumb BL 指令编码格式就可以知道大 Order Disulfiram order Fluconazole 概了!
详细过程。

 

example

指令 f000 fe55

 

f000  表示偏移地址的高位,为第一条指令:0xf000 & 0x7ff 为offset high 0x00
后11为偏移地址:
fe55  表示偏移地址的低位,为第二条指令
后11为偏移地址:0xfe55 & 0x7ff = 0110 0101 0101 = 0x655

0x00 <<12 = 0000 0000 0000 0000 = 0x0000
0x655 << 1  = 1100 1010 1010 = 0xcca

0x0000 | 0xcca = 0xcaa

知道编移量计算代码就很简单了

仍然以上面的作为例子

假若我们要修改代码让它跳转到+200 = +0xc8处

 

((0xfe55 >> 11 << 11) | (0xc8 >> 1)) = 0xf864

 

 

 

 

 

arm machine code data processing instructions

Here is how data processing instructions are coded:

ARM data processing instructions

 

 

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You have condition codes table in that page of yours. Registers are coded 0000 through 1111.

All your examples fall under the same category. The picture is extracted from some document on my HDD, but I also managed to find it by google. Coding those instructions is a tedious job.

So, mov r0, r0 should go like this:

1110 00 0 0 1101 0000 0000 00000000