Coldfire uC5282 Question

[Eric Norum]

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......




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

-- 
Eric Norum
wenorum at lbl.gov