Re: [Pgubook-readers] exit.s on amd64? 0x3c.

[Guillaume Yziquel]

Cian a écrit :
> Hi Guillame,

Hi Cian.

> On Fri, Jan 1, 2010 at 3:48 PM, Guillaume Yziquel
> <address@hidden> wrote:
>
> > Googling around, I found:
> >        http://www.vikaskumar.org/amd64/sample.htm
>
> Looks like a nice resource, note the links to the x86-64 ABI docs at
> http://www.x86-64.org/documentation.html - these are worth reading.

Yes. Already read them (though not in full detail). They are indeed 
worth reading.

> > The thing that I'd like to know is the following:
> >
> > -1- The syscall numbers are different. Where do you get the list of syscall
> > numbers?
>
> Under Linux, you should find these via /usr/include/sys/syscall.h.
> Note that you may need to follow a couple of #include redirections
> from there. For example, on my Ubuntu 8.10 Intrepid install the actual
> list of 64bit syscalls is in /usr/include/asm/unistd_64.h, which ends
> up getting included (via a somewhat circuitous route) into
> sys/syscall.h.

'locate unistd.h | grep x86_64' has also been rather useful on Debian.

> > -2- Would you believe useful to include a few info in PGU for amd64? (How to
> > make syscalls, where to find the syscalls numbers, etc...)
>
> I think this would be (increasingly) useful.

Indeed.

However, I'd like to point out something that happens with the power.s 
code in th PGU book, page 59. I just typed the same code litterally, and 
I get:

> as power.s -o power.o
> power.s: Assembler messages:
> power.s:14: Error: suffix or operands invalid for `push'
> power.s:15: Error: suffix or operands invalid for `push'
> power.s:18: Error: suffix or operands invalid for `push'
> power.s:21: Error: suffix or operands invalid for `push'
> power.s:22: Error: suffix or operands invalid for `push'
> power.s:26: Error: suffix or operands invalid for `pop'
> power.s:59: Error: suffix or operands invalid for `push'
> power.s:82: Error: suffix or operands invalid for `pop'
> make: *** [power.o] Erreur 1

It seems that as doesn't like at all stuff like pushl as popl.

Is it because I'm on amd64? If so, how can I deal with it?

All the best,

Guillaume Yziquel.

--
     Guillaume Yziquel
http://yziquel.homelinux.org/