Re: prime numbers

[Frank Kotler <fbkotler@comcast.net>]

Paul Irofti wrote:

...
> ok, so than what's the diffrence between:
> a) movb $test, %al
> b) movb test, %al
> c) movb (test), %al
> c) movb ($test), %al      #if this exists!

Hmmm, I'm actually Nasmist, not an as user, but...

> and how come when i access kernel ops i use $<oper>
> 
> i.e. movl $__NR_write, %eax    #i actually append the address 1?! not 
> put the value 1?!

I perhaps shouldn't have said "address"... As I understand it, the '$' 
indicates an "immediate" value. "movl $4, %eax" (or $__NR_write) moves 
the value 4 into %eax. "movl 4, %eax" would move the contents of address 
0x00000004 into %eax - except that it segfaults because 0x00000004 isn't 
in "your" address space.

Maybe an actual (G)as user can clarify it better. It *is* confusing - if 
it were easy, everybody'd be doing it! :)

Best,
Frank