accessing stack variables with inline assembly for gnu c (68000 assembly)

category: code [glöplog]

I'm tired of enumerating variables in stack and would like to use inline assembly!! so I write this:

Code:


void test(int what) {
 asm("move.l %[what], %d0" :: [what] "r" (what));
}

and the gnu c compiler says this:

Code:


invalid 'asm': operand number out of range

I'm trying to move what into %d0. I think I have a conceptual problem, I think I get inline assembly

I'm trying to move what into %d0

what should this look like?

added on the 2013-09-06 05:58:06 by sigflup

nevermind, I figured it out

added on the 2013-09-06 07:51:03 by sigflup

and years from now, someone will have the exact same problem, and they'll find your post with google and get frustrated because you didn't tell what it was you figured out.

added on the 2013-09-06 08:09:21 by sol_hsa

here's a hint: stop playing with men's toys, damn woman.

added on the 2013-09-06 09:44:11 by superplek

also look up at&t syntax

added on the 2013-09-06 09:45:18 by superplek

Quote:

here's a hint: stop playing with men's toys, damn woman.

What? Not that I know either of your genders, what the heck does that have to do with anything? What's wrong with you?

added on the 2013-09-06 10:21:22 by sol_hsa

@superplek: fuck off with that sexist attitude.

added on the 2013-09-06 10:30:06 by visy

Fail to locate the funny. Also, 68k, not intel.

added on the 2013-09-06 10:35:57 by Preacher

@visy: shut up you socialist dick

added on the 2013-09-06 12:34:56 by superplek

C'mon people /o\

But yes, @sigflup: please post what the solution was (even if just the new line you used), somebody else may find it useful... or even yourself some time from now on =P

added on the 2013-09-08 11:22:26 by Sik

sigflup, I went to your website, and I thought that little thing dancing around was really cool! :)

ignore this asshole, i can safely say you can fuck around as much as you want with "men's toys" :)

added on the 2013-09-08 19:24:29 by bitnaughty

Well, I'm hesitant to say why it doesn't work. I changed my register to d1 and it worked fine. I found that if you put your registers in the clobber list it works fine

added on the 2013-09-10 05:01:02 by sigflup

I wonder who the bitch respects more; superplek the jerk, or the paternalistic jerkoffs. Hmm. And why am I worried about what some bitch thinks, must be the 68k skillz.

added on the 2013-09-20 12:23:49 by fuck you and you

Wat?

added on the 2013-09-20 12:50:31 by Optimus

okay, so who's trolling?

added on the 2013-09-20 13:05:11 by Preacher

don't feed the trolls

and hey, if nobody is allowed to mess up, nobody learns, Sigflup

added on the 2013-09-20 14:21:26 by neu / metoikos

Yes, you have to put the register in the clobber list to reserve it for your asm code. Otherwise GCC tries to use it and complains that you'll be messing with it in your asm code.

Useful references :
* http://www.ibiblio.org/gferg/ldp/GCC-Inline-Assembly-HOWTO.html
* [url]http://www.gtoal.com/compilers101/small_c/vectrexc/INCLUDE/VECTREX.H[/urll] has some useful examples (it's targetted for Vectrex and 6809, but some of it is applicable to other platforms as well, after some register renaming).

added on the 2013-09-20 14:59:06 by PulkoMandy

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accessing stack variables with inline assembly for gnu c (68000 assembly)

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