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Message
From: John.Smith@y...
Date: Fri, 31 Oct 2003 16:36:09 +0100
Subject: Re: [openrisc] Instruction l.mfspr ouput is not expected!
----- Original Message -----
From: "Damjan Lampret" <lampret@o... >
To: <openrisc@o... >
Date: Fri, 31 Oct 2003 13:29:07 +0100
Subject: Re: [openrisc] Instruction l.mfspr ouput is not expected!
Hi Damjan
>
>
> 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.
No,It is not zero I found.SR is 0x8001.I am using modelsim.
It is strange that register SR is 0x8001.I monitored SR in module
or1200_sprs.On reset SR should be 0x8001.
And in or1ksim the result is right.
I don't know what is wrong yet!:(
>
> > > 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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