2008-09-04 09:45:24 Assembly code in uClinux

Daniele Pagani (ITALY)

Message: 61622

Dear guys,

sorry if this one could be a stupid question.

I've the BF537STAMP board and in the docs with the cd I find the file

ism-main.html in which I have a link to "arithmetic operation", but the link doesn't work fine.

Then I'm a little confused.

So, the question is:

1) in uClinux and in userspace can I develop program with Blackfin assembly code (with Dreg,Preg and so on..)?

2) can I use all the arithmetic operation that I usually used with VisualDSP (in assembly code)? That is can I write a simple line such as:

"A0 = R2.L*R1.H, A1 = R2.L*R1.L (M) || [I1++M0]=R0; "

Any suggestion is appreciated,

best regards,

Daniele.

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2008-09-04 10:18:24 Re: Assembly code in uClinux

Mike Frysinger (UNITED STATES)

Message: 61625

you should be using http://docs.blackfin.uclinux.org/ for the latest documentation ... it explains how to use inline assembly in C, or just write raw assembly code

since the assembly language is Blackfin specific (see the PRM), it doesnt matter what toolchain you use as the language is the same

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2008-09-04 10:41:33 Re: Assembly code in uClinux

Daniele Pagani (ITALY)

Message: 61626

Dear Mike,

I'm looking also at

http://docs.blackfin.uclinux.org/doku.php?id=ism:main

but the link to arithmetic operations doesn't exist yet.

So, if I understand, I can use also arithmetic operations in assembly code and then I can use bfin-uclinux-gcc and so on to compile software.

Thank you very much for you support.

Best regards,

Daniele.

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2008-09-04 12:04:23 Re: Assembly code in uClinux

Frank Van Hooft (CANADA)

Message: 61627

This page gives you info on writing assembly language code within uclinux:

http://docs.blackfin.uclinux.org/doku.php?id=using_in-line_assembly_calling_external_assembly_from_c&s[]=asm

Regarding the detailed blackfin instruction set, your best reference is the one you're no doubt already familiar with, which is the Analog Devices Blackfin programming reference manual.

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2008-09-04 13:57:16 Re: Assembly code in uClinux

Mike Frysinger (UNITED STATES)

Message: 61634

the ism: namespace is just a limited portion of the PRM. if something is missing, go read the PRM.

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2008-09-05 02:52:45 Re: Assembly code in uClinux

Daniele Pagani (ITALY)

Message: 61650

Thank you very much,

so, if I understand, I can use my math alghoritm developed in assembly.

A different question is if can I use sport register, dma and so on in assembly code in user space, but I think that it is not possible, as in C language.

Best regards,

Daniele.

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2008-09-05 03:49:48 Re: Assembly code in uClinux

Mike Frysinger (UNITED STATES)

Message: 61651

the language doesnt matter -- it's an architecture issue, not language

after all, pretty much all languages out there (like C) simply generate assembly before being turned into machine code anyways ...

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2008-09-05 04:47:13 Re: Assembly code in uClinux

Daniele Pagani (ITALY)

Message: 61652