Coldfire uC5282 Question

[Eric Norum]

????
Instruction opcode is: 0x51c2

From the Programmer's Reference Manual -- hope this attaches in-line for non-Mac mail viewers...


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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 D?rfler 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.
>> 
> 
> 
> -- 
> 
> --------------------------------------------
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-- 
Eric Norum
wenorum at lbl.gov