[fpc-devel] arm embedded cortexM3 unrecognized opcode

[Geoffrey Barton]

On 13 Jul 2010, at 12:24, Jeppe Johansen wrote:

> The bit names are a bit hard, since there aren't any parsing  
> facilities in place for them, to my knowledge. I think they would  
> need a special syntax to not be seen as symbols by the assembler  
> reader
>
> It'll take some work on the assembler reader and writer to get those  
> special instructions to work
>
> The special registers should be added to armreg.dat(and then run  
> mkarmreg). I didn't add all the cortex registers.

ok, I have done that, 'msr primask,r0' compiles ok. I will disassemble  
and compare with the C code examples, if I can understand them :-)

> Is primask a real register btw? It just assembles to cpsr

cpsr should not exist in cortexm3 according to ARM (see www.arm.com/files/pdf/Cortex-M3_programming_for_ARM7_developers.pdf 
  eg. page 10 ) It is not in either the v7m archictecture or cortex_m3  
tech ref manuals.

primask is a (real as far as I can see) one bit register. I will try  
flipping it on the hardware debugger and see if it changes anywhere  
else...

rgds
Geoffrey
>
> Geoffrey Barton skrev:
>>
>> On 12 Jul 2010, at 19:06, Jeppe Johansen wrote:
>>
>>> Add the missing instructions to the bottom of armins.dat, run  
>>> mkarmins in the same directory.
>>
>>
>> It now recognises the mnemonic 'cpsie' but not the following 'i'.
>>
>> The 'msr' instruction should also allow the interrupts to be  
>> enabled/disabled as
>>
>> msr primask,r0
>>
>> but msr gives an unknown identifier error for 'primask' and all the  
>> other 'special' register names ('apsr' etc.) Perhaps they have been  
>> given different names, but I cannot find them listed anywhere in  
>> the FPC source.
>>
>>> (and then submit patch) :-)
>>
>> well, once I have some code which works on the chip, I will ask  
>> someone where to put it :-)
>>
>> Geoffrey
>>
>>>
>>> Geoffrey Barton skrev:
>>>> I wrote a procedure to turn on interrupts:-
>>>>
>>>> procedure intenable;nostackframe;
>>>> begin
>>>> asm
>>>>    cpsie i
>>>> end;
>>>> end;
>>>>
>>>> The compilation fails with 'Error: Unrecognized opcode cpsie'
>>>>
>>>> The compiler also does not recognise 'cpsid' and also 'primask'  
>>>> as in 'mrs r0,primask'
>>>>
>>>> any ideas/workarounds?
>>>>
>>>> Geoffrey
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