Message

Reply | Reply all

Date Prev | Date Next | Thread Prev | Thread Next Date Index | Thread Index

From: John.Smith@y...
Date: Thu, 30 Oct 2003 14:07:25 +0100
Subject: Re: [openrisc] Instruction l.mfspr ouput is not expected!

Hi all,
Sorry to post again!

The simple test program:
>         l.addi  r3,r0,0x0004 
>         l.mtspr r5,r0,17 
>         l.sw 0(r3),r5 

When come to modelsim RTL simulation,r5 always stick to 0x0000.
l.mfspr and l.mtspr can not visit special-purpose register.
SR[SM]=1 indicate or1k is in Supervisor Mode.

But I tried it in or1ksim and the result is right:r5=0x8001.

I don't know what I have done wrong?
Anyone could help me out?

Thanks and Regards!


----- Original Message ----- 
From: John.Smith@y...  
To: openrisc@o...  
Date: Wed, 29 Oct 2003 04:14:42 +0100 
Subject: [openrisc] Instruction l.mfspr ouput is not expected! 

> 
> 
> I tried the simple program in modelsim as the following. 
> 
>         l.addi  r3,r0,0x0004 
>         l.mtspr r5,r0,17 
>         l.sw 0(r3),r5 
> 
> It should be 0x8001 on dwb_dat_o,but it appeared 0x0000. 
> The l.mtspr instruction seem not to work. 
> Could anyone explain it to me?I don't know what mistakes I did. 
> 
> Thanks and Regards! 
> 

Follow up	Author
Re: [openrisc] Instruction l.mfspr ouput is not expected!	Damjan Lampret