Mail Archives: djgpp/1997/07/09/13:21:04
Matthew Mastracci wrote:
>
> On Sun, 6 Jul 1997, john Conner wrote:
>
> > asm("leal _RAM,%ebp"); /* RAM is a c pointer */
> >
> > It crashes every time. I get a gpf or stack fault.
> > It works fine if I use esi,edi,ect. Any help?
>
> Forgive me if I'm wrong, but isn't the proper line:
>
> asm("leal %ebp,_RAM");
>
> Your line is moving the contents of _RAM (undefined at the time, I'm
> assuming) to ebp. AT&T syntax is "backwards" (in relation to Intel).
> The opcodes act like:
>
> grammer: [verb] FROM [src] TO [dest]
> opcode: [verb] [src], [dest]
> ie: movb 5, %eax
>
> instead of:
>
> grammer: [verb] TO [dest] FROM [src]
> opcode: [verb] [dest], [src]
> ie: mov ax, 3
>
> AT&T syntax makes a little more sense gramatically (in terms of English),
> but for people raised on Intel, it's dang confusing sometimes. ;)
>
> /\/\att /\/\astracci mmastrac AT acs DOT ucalgary DOT ca
>
> GCS/GE d- s+:+ a--- C++++ UA P+ L E-- W+ N++ o K+ w+ O M- V
> PS++ PE++ Y+ PGP t+++ 5+++ X++ R++ tv+ b+++ DI++++ I
> G++ e h r* z?
nope, I'm trying to move RAM(yes its defined) to %ebp. Basicly what im
trying to do is pass a pointer into an obj asm module that uses %ebp for
one of its functions.
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