Coldfire uC5282 Question

[Thomas Dörfler]

Ups,

On 30.03.2010 20:35, Eric Norum wrote:
> Ooops
> My mistake.
> I read what I wanted to, not what I actually saw. An opcode of 0x51ca is not an SCC instruction, it's a DBCC.
> Which is not legal for a ColdFire......

So you got me there :-) Never trust the output of a tool. You are right,
DBcc is a NONO on Coldfire, and quite likely to get emitted from GCC...

So Joel, if this is NOT coming from assembly code, GCC has a problem here

CU,

Thomas.

> 
> 
> 
> 
> What compiler flags produced this?
> 
> 
> On Mar 30, 2010, at 11:19 AM, Eric Norum wrote:
> 
>> ????
>> Instruction opcode is: 0x51c2
>>
>> From the Programmer's Reference Manual -- hope this attaches in-line for non-Mac mail viewers...
>>
>>
>> <PastedGraphic-1.tiff>
>>
>> So the Condition is 1 (F -- never true)
>> The Mode is 0 (data register)
>> The register is 2.
>>
>>
>> What's illegal about that?
>>
>>
>>
>> On Mar 30, 2010, at 11:00 AM, Thomas Dörfler wrote:
>>
>>> Joel,
>>>
>>> according to the ColdFire Family Programmer's Reference Manual Rev3,
>>> page 4-74, this bit coding is not legal.
>>>
>>> The Coldfire supports the Scc instruction only for Byte Operands (e.g.
>>> sf.b %d2) This would generate an opcode of 51c2, not 51ca
>>>
>>> Either you fed GCC with wrong input, or it produces wrong output. :-(
>>>
>>> Good luck,
>>>
>>> Thomas.
>>>
>>>
>>> On 30.03.2010 19:48, Joel Sherrill wrote:
>>>> Hi,
>>>>
>>>> I am running gcc testsuite on the qemu uC5282
>>>> simulator.  I am getting a number of failures
>>>> where qemu says an illegal instruction was
>>>> encountered.  Can a coldfire person out there
>>>> tell me whether this is qemu not supporting
>>>> a valid coldfire instruction or this instruction
>>>> should not be generated by gcc with the -mcpu=5282
>>>> option
>>>>
>>>> [joel at rtbf64b gcc]$ m68k-rtems4.10-objdump -da zero-struct-2.x7 | grep
>>>> -i "51 ca"
>>>> [joel at rtbf64b gcc]$ m68k-rtems4.10-objdump -da zero-struct-2.x7 | grep
>>>> -i "5186c"
>>>>  5186c:    51ca               sf %d2
>>>>
>>>>
>>>> $ uC5282 -i zero-struct-2.x7
>>>> /users/joel/qemu-coverage/install/bin/qemu-system-m68k is
>>>> /users/joel/qemu-coverage/install/bin/qemu-system-m68k
>>>> qemu: fatal: Illegal instruction: 51ca @ 0005186c
>>>> D0 = 00000000   A0 = 00063b98   F0 = 0000000000000000 (           0)
>>>> D1 = 00000034   A1 = 00063186   F1 = 0000000000000000 (           0)
>>>> D2 = 00000000   A2 = 00063b98   F2 = 0000000000000000 (           0)
>>>> D3 = 000615e6   A3 = 00000000   F3 = 0000000000000000 (           0)
>>>> D4 = 00000034   A4 = 00000000   F4 = 0000000000000000 (           0)
>>>> D5 = 00000000   A5 = 00000000   F5 = 0000000000000000 (           0)
>>>> D6 = 00000000   A6 = 2000ffcc   F6 = 0000000000000000 (           0)
>>>> D7 = 00000000   A7 = 2000ffa0   F7 = 0000000000000000 (           0)
>>>> PC = 00051864   SR = 2700 ----- FPRESULT =            0
>>>> [joel at rtbf64b gcc]$ uC5282 zero-struct-2.x7^C
>>>>
>>>> Thanks.
>>>>
>>>
>>>
>>> -- 
>>>
>>> --------------------------------------------
>>> Embedded Brains GmbH
>>> Thomas Doerfler        Obere Lagerstrasse 30
>>> D-82178 Puchheim       Germany
>>> email: Thomas.Doerfler at embedded-brains.de
>>> Phone: +49-89-18908079-2
>>> Fax:   +49-89-18908079-9
>>> _______________________________________________
>>> rtems-users mailing list
>>> rtems-users at rtems.org
>>> http://www.rtems.org/mailman/listinfo/rtems-users
>>
>> -- 
>> Eric Norum
>> wenorum at lbl.gov
>>
>>
>>
>> _______________________________________________
>> rtems-users mailing list
>> rtems-users at rtems.org
>> http://www.rtems.org/mailman/listinfo/rtems-users
> 


-- 

--------------------------------------------
Embedded Brains GmbH
Thomas Doerfler        Obere Lagerstrasse 30
D-82178 Puchheim       Germany
email: Thomas.Doerfler at embedded-brains.de
Phone: +49-89-18908079-2
Fax:   +49-89-18908079-9