About CGEN's RTL

About CGEN's RTL

[姹 缈]

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hi

I am now trying to write an .cpu file whose ISA contains some complex 
instructions, thereby it needs to invoke c code using c-code,c-call or 
c-raw-call.

I found in sparccom.cpu that there is an expression of (c-call made symbol 
operand1 operand2 ...). It says in the comment that 'symbol' is a c 
function. I guess this expression means an c function call, and the 
function was like symbol(operand1, operand2 ...), isn't it? If so, where is 
the function symbol(operand1 operand2 ...)? In the cpu description of 
sparccom, I found  (set rd (c-call WI handler pc rs1 rs2)), but I can't 
find the function description of 'handler'! 

Where do I write the c funtion how to announce it to the .cpu
file?

thank you for your help!

Dam Wang





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Re: About CGEN's RTL

[Frank Ch. Eigler]

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Hi -

On Mon, Oct 07, 2002 at 12:28:30PM +0000, æ± ç¿ wrote:
> [...]
> I found in sparccom.cpu that there is an expression of (c-call made symbol 
> operand1 operand2 ...). It says in the comment that 'symbol' is a c 
> function. I guess this expression means an c function call, and the 
> function was like symbol(operand1, operand2 ...), isn't it? If so, where is 
> the function symbol(operand1 operand2 ...)? [...]

Such functions would be placed into the hand-written portions that
accompany that CGEN-generated kernels of the CPU simulators.  See
for example the c-calls in the arm7.cpu, as implemented in
sid/component/cgen-cpu/arm7t/arm7f.cxx.

- FChE

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