如何分解原始MIPS代码?-HowdoIdisassemblerawMIPScode?

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Hmm, it seems easier than that. -b elf32-tradlittlemips does 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, -mmips makes objdump recognize the file as binary for MIPS. Since the target machine is little endian, I also had to add -EL to make the output match the output for x.o.

嗯，似乎比那容易。-b elf32-tradlittlemips不工作，因为文件不是ELF可执行文件，而是二进制文件。所以，正确的选项是-b二进制。另一个选项-mmips使objdump将文件识别为MIPS的二进制文件。由于目标机器是小的endian，所以我还需要添加-EL使输出与x.o的输出匹配。

-mmips only includes the basic instruction set. The AR7 has a MIPS32 processor which has more instructions than just mips. To decode these newer MIPS32 instructions, use -mmips:isa32. A list of available ISAs can be listed with objdump -i -m.

-mmips只包含基本指令集。AR7有一个MIPS32处理器，它的指令比mips多。为了解码这些新的MIPS32指令，使用-mmips:isa32。可用的ISAs列表可以在objdump -i -m中列出。

The final command becomes:

最后一个命令就变成:

mipsel-linux-gnu-objdump -b binary -mmips:isa32 -EL -D vmlinux

This would show registers like $3 instead of their names. To adjust that, I used the next additional options which are mentioned in mipsel-linux-gnu-objdump --help:

这将显示像$3这样的寄存器而不是它们的名称。为了调整这一点，我使用了在mipsel-linux- gnuobjdump中提到的下一个额外选项——help:

-Mgpr-names=32,cp0-names=mips32,cp0-names=mips32,hwr-names=mips32,reg-names=mips32

I chose for mips32 after reading:

我在阅读后选择了mips32:

• http://www.linux-mips.org/wiki/AR7
• http://www.linux-mips.org/wiki/AR7
• http://www.linux-mips.org/wiki/Instruction_Set_Architecture
• http://www.linux-mips.org/wiki/Instruction_Set_Architecture

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??? What's wrong with just:

? ? ?只是怎么了:

mipsel-linux-gnu-gcc -c -o x.o x.c
mipsel-linux-gnu-objdump -D x.o

Is the problem that -D diassembles all the sections, code or not? Use -d then. Or -S to show assembly interleaved with source (implies -d).

问题是-D diassembles所有的部分，代码还是没有?使用- d。或-S显示装配与源(暗指-d)交叉。

or how about getting the assembly code from gcc:

或者如何从gcc获得汇编代码:

mipsel-linux-gnu-gcc -S x.c

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Use ODA, the online disassembler:

使用ODA，在线反汇编程序:

http://www.onlinedisassembler.com

http://www.onlinedisassembler.com