invalid opcode

[mlabaf2]

Before start

• [X] I have read the RISC-V ISA Manual and this is not a RISC-V ISA question. 我已经阅读过 RISC-V 指令集手册，这不是一个指令集相关的问题。
• [X] I have read the XiangShan Documents. 我已经阅读过香山文档。
• [X] I have searched the previous issues and did not find anything relevant. 我已经搜索过之前的 issue，并没有找到相关的。
• [X] I have searched the previous discussions and did not find anything relevant. 我已经搜索过之前的 discussions，并没有找到相关的。
• [X] I have reviewed the commit messages from the relevant commit history. 我已经浏览过相关的提交历史和提交信息。

Describe the question

HI i added some new opcode to XiangShan. I modify Instruction.scala, ALU.scala, parameters.scala, DecodeUnit.scala. when I run my workspace , I recieved this message in report of .log file . I cannot find from which .scala code this message is produced "invalid opcode...."

[mlabaf2]

Another question is which .scala file call class Alu in Alu.scala file? I cannot find it to trace the mentioned error message...

[cebarobot]

This invalid opcode message is come from NEMU, the golden reference model of XiangShan. You may modify the NEMU to support your new instruction, or just add --no-diff argument to run emu in no diff mode.

[cebarobot]

Another question is which .scala file call class Alu in Alu.scala file? I cannot find it to trace the mentioned error message...

I think it's here.

https://github.com/OpenXiangShan/XiangShan/blob/c2ce03f70f78cf3e4a3588a9396eaf9b67952cd9/src/main/scala/xiangshan/backend/fu/FuConfig.scala#L297-L307

And this fuGen is called here.

https://github.com/OpenXiangShan/XiangShan/blob/7ffbf5fd74959ca8274ee07f523682ef2495c1d6/src/main/scala/xiangshan/backend/exu/ExeUnit.scala#L62-L66

[mlabaf2]

thanks solved