On Wed, Jul 31, 2002, Muli Ben-Yehuda wrote about "Re: GNU Assembler #2":
> many arguments, through a function pointer. Here's code that does it,
> doing in asm only the required bits:
>
> #include <stdio.h>
>
> typedef void (*pfunc)(void);
>
> void caller2(void* pfn, unsigned long* params, unsigned int nargs)
> {
> pfunc func = (pfunc)pfn;
>
> while (nargs--)
> asm ("pushl %0" ::"g" (params[nargs]));
>
> (*func)();
> }
What is this "pushl" assembly instruction? Can't you put things on the
stack with a normal "movl"? (see, I told you my assembly is very rusty...)
Can't something like this work? (I'm assuming the stack in i386 goes
up. I'm *really* rusty in assembly, so I am probably botching this up.
I also have no idea how large is each frame on the stack, I added 2
just as an example)).
void caller2(void* pfn, unsigned long* params, unsigned int nargs)
{
/* WARNING: this is very unportable! (if works at all :) ) */
while (nargs--)
((long *)&nargs)[nargs+2]=params[nargs];
(*(pfunc)pfn)();
}
--
Nadav Har'El | Wednesday, Jul 31 2002, 22 Av 5762
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Phone: +972-53-245868, ICQ 13349191 |Cigarette: tobacco wrapped in paper, fire
http://nadav.harel.org.il |at one end, and a fool at the other.
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