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Message
From: "Damjan Lampret" <lampret@o...>
Date: Fri, 31 Oct 2003 13:29:07 +0100
Subject: Re: [openrisc] Instruction l.mfspr ouput is not expected!
John,
you should really read the openrisc 1000 architecture manual before you go
on. Let me explain what you are doing:
> > l.addi r3,r0,0x0004
You set R3 with 0x4. Nothing wrong with this.
> > l.mtspr r5,r0,17
You set special purpose register R5+17 with zero (R0). Nothing wrong with
that but I doubt this is what you want. Assuming R5 is contains value zero,
in that case you are setting special purpose register SR with zero.
> > l.sw 0(r3),r5
You store to memory location 0x4 (you previoualy set R3 to 0x4) with value
of register R5.
regards,
Damjan
----- Original Message -----
From: <John.Smith@y...>
To: <openrisc@o...>
Sent: Thursday, October 30, 2003 2:07 PM
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!
> >
>
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