On Sat 14-Dec-2019 5:17a, Harry Potter@3:770/3.0 said to Harry Potter:

I found it. :) Sorry for wasting your time. :(

It is never a waste of time to ask a question, especially in a public forum as others do learn from the dialog. You never know when a simple questions that has been asked before may spark insights or the imagination of the other readers.

In your case, I am now courious how Power C does handle passing arguments and the return value from a function in assembler?

[+] K-Guide
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On Saturday, December 14, 2019 at 11:41:28 AM UTC-5, K-Guide wrote:

On Sat 14-Dec-2019 5:17a, Harry Potter@3:770/3.0 said to Harry Potter:

I found it. :) Sorry for wasting your time. :(

It is never a waste of time to ask a question, especially in a public forum

as

others do learn from the dialog. You never know when a simple questions that has been asked before may spark insights or the imagination of the other readers.

In your case, I am now courious how Power C does handle passing arguments and the return value from a function in assembler?

[+] K-Guide

It seems that I have to pass the return value in the TOS, but what if the function has no parameters or too few parameters?

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On Sat 14-Dec-2019 8:48a, Harry Potter@3:770/3.0 said to K-Guide:

It seems that I have to pass the return value in the TOS, but what if the function has no parameters or too few parameters?

Using the stack makes alot of since for the return value of the assembler function. In the case of no parameter, I suspect you can just call the routine
via a function pointer in C. Set that to the address of your assembler routine
and call the function. Please bear in mind I am not a Power C programmer, but
am just guessing based on other platforms I program on. If you have parameters there could be some documemtation on how to pass them via registers in the compiler docs. Compilers seem to have their own style for stuff like that. It also could be that you just need to drop the values into a certain memory location as the assember routine expects it there.

Not sure I follow you about the too few parameters.

[+] K-Guide
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On Saturday, December 14, 2019 at 7:17:21 PM UTC-5, K-Guide wrote:

Using the stack makes alot of since for the return value of the assembler function. In the case of no parameter, I suspect you can just call the

routine

via a function pointer in C. Set that to the address of your assembler

routine

and call the function. Please bear in mind I am not a Power C programmer,

but

am just guessing based on other platforms I program on. If you have

parameters

there could be some documemtation on how to pass them via registers in the compiler docs. Compilers seem to have their own style for stuff like that.

It

also could be that you just need to drop the values into a certain memory location as the assember routine expects it there.

Not sure I follow you about the too few parameters.

The docs. I have reveal that the return value seems to overwrite the last parameter passed to the function. That's why I am worried about the too few parameters.

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On Sat 14-Dec-2019 5:03p, Harry Potter@3:770/3.0 said to K-Guide:

The docs. I have reveal that the return value seems to overwrite the last parameter passed to the function. That's why I am worried about the too few parameters.

Ahhh. That does seem odd as I would have though the assember routine would pull from the stack each of its parameters. Sounds like some small prototype code is needed to test this out and determine how this works.

Are you writing the assembler fuctions or just the C portion of the code?

[+] K-Guide
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Admittedly, I'm not currently using Power C but am working on special support for it. I also want to create some libraries for it, and some of those functions are better off in Assembler.

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That cool your working to expand Power C. I have considered doing some C level
programming on the C64 via cc65, but never got around to it.

[+] K-Guide
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Try https://www.lyonlabs.org/commodore/onrequest/powerc/index.html. :)

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