Linux 如何反汇编原始 MIPS 代码？
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How do I disassemble raw MIPS code?
提问by Lekensteyn
Similarly to How do I disassemble raw x86 code?, but then for the MIPS architecture: how do I disassemble raw MIPS code with objdump? I want to check the instructions in a vmlinux image, but to do so I now have to:
类似于如何反汇编原始 x86 代码？，但是对于 MIPS 体系结构：如何使用 反汇编原始 MIPS 代码objdump？我想检查 vmlinux 映像中的说明，但为此我现在必须：
: > x.c
mipsel-linux-gnu-gcc -c -o x.o x.c
mipsel-linux-gnu-objcopy --add-section raw=vmlinux x.o
mipsel-linux-gnu-objcopy --remove-section .comment x.o
mipsel-linux-gnu-objdump -D x.o | less
Is there an easier way to do it? I've tried the below to no avail:
有没有更简单的方法来做到这一点？我试过以下无济于事：
mipsel-linux-gnu-objdump -b elf32-tradlittlemips -mmips -Mgpr-names=O32,cp0-names=mips1,cp0-names=mips1,hwr-names=mips1,reg-names=mips1 -D vmlinux | less
It just spits out:
它只是吐出来：
mipsel-linux-gnu-objdump: vmlinux: File format not recognized
If it helps, here is the output of some commands:
如果有帮助，这里是一些命令的输出：
$ file x.o
x.o: ELF 32-bit LSB relocatable, MIPS, MIPS-I version 1 (SYSV), with unknown capability 0xf41 = 0x756e6700, with unknown capability 0x70100 = 0x1040000, not stripped
$ mipsel-linux-gnu-objdump -p x.o
x.o: file format elf32-tradlittlemips
private flags = 1006: [abi=O32] [mips1] [not 32bitmode] [PIC] [CPIC]
The target is an AR7 CPU.
目标是 AR7 CPU。
采纳答案by Lekensteyn
Hmm, it seems easier than that. -b elf32-tradlittlemipsdoes not work because the file is not an ELF executable, but binary. So, the correct option to be used is -b binary. The other option, -mmipsmakes objdump recognize the file as binary for MIPS. Since the target machine is little endian, I also had to add -ELto make the output match the output for x.o.
嗯，似乎比这更容易。-b elf32-tradlittlemips不起作用，因为该文件不是 ELF 可执行文件，而是二进制文件。因此，要使用的正确选项是-b binary. 另一个选项是-mmips让 objdump 将文件识别为 MIPS 的二进制文件。由于目标机器是小端，我还必须添加-EL以使输出与x.o.
-mmipsonly includes the basic instruction set. The AR7 has a MIPS32 processor which has more instructionsthan just mips. To decode these newer MIPS32 instructions, use -mmips:isa32. A list of available ISAs can be listed with objdump -i -m.
-mmips只包括基本指令集。AR7 有一个 MIPS32 处理器，它有更多的指令，而不仅仅是 mips。要解码这些较新的 MIPS32 指令，请使用-mmips:isa32. 可用 ISA 的列表可以用 列出objdump -i -m。
The final command becomes:
最后的命令变成：
mipsel-linux-gnu-objdump -b binary -mmips:isa32 -EL -D vmlinux
This would show registers like $3instead of their names. To adjust that, I used the next additional options which are mentioned in mipsel-linux-gnu-objdump --help:
这将显示寄存器 like$3而不是它们的名称。为了调整它，我使用了以下提到的附加选项mipsel-linux-gnu-objdump --help：
-Mgpr-names=32,cp0-names=mips32,cp0-names=mips32,hwr-names=mips32,reg-names=mips32
I chose for mips32after reading:
我mips32在阅读后选择了：
回答by Kaz
??? What's wrong with just:
？？？只是有什么问题：
mipsel-linux-gnu-gcc -c -o x.o x.c
mipsel-linux-gnu-objdump -D x.o
Is the problem that -Ddiassembles all the sections, code or not? Use -dthen. Or -Sto show assembly interleaved with source (implies -d).
是否-D反汇编所有部分、代码的问题？使用-d即可。或者-S显示与源交错的程序集（暗示-d）。
or how about getting the assembly code from gcc:
或者如何从 gcc 获取汇编代码：
mipsel-linux-gnu-gcc -S x.c
