Andes Workshop

It is currently Wed Jun 28, 2017 2:18 am

All times are UTC + 8 hours [ DST ]




Post new topic Reply to topic  [ 1 post ] 
Author Message
 Post subject: ir14 的 all zero opcode reserved interruption exception
PostPosted: Sat Sep 24, 2011 10:49 am 
Offline
User avatar

Joined: Fri Mar 04, 2011 9:36 pm
Posts: 500
ALZ 是提供一個特殊目的 debug 工具, 設計的用途是如果程式不明原因亂跑時, 如果執行到 All Zero Opcode reserved instruction (0x00000000), 可以盡快產生 exception. 否則如果程式亂跑又 fetch 到的 code 是 All Zero Opcode (一般 padding data 會塞 0x00 or 0xff ), 程式會視為正常狀況而繼續執行. 所以你可能無法知道程式的錯誤點.

但是, All Zero Opcode 也是一個合法指令 (LBI R0, [R0+0]), 因此在正常的 program 下, ALZ bit 是要 disable. 否則會造成你現在遇到的狀況. 不曉得你們是否有其他的目的要打開這個 bit. 如果沒有建議把 ALZ disable.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1 post ] 

All times are UTC + 8 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group