Re: [elysium-developers] PCT

[Adam L. <ag...@li...>]

On Sat, Feb 19, 2000 at 12:57:04PM +0100, Kasper Verdich Lund wrote:
> > Well I've got a quick PCT system working. It ends up w/
> >
> > _process_run (p->pr_cr3, p->pr_pct, USER_CS, 0x3202, 0, USER_DS);
>=20
> That looks okay.
>=20

Well I'm stuck again ;(

In t2 (the test program that currently does a PCT to t1) the asm code for
sys_pct is thus:

sys_pct:
        movl    $0x55,%ecx
        movl    4(%esp),%eax
        movl    $0x58,%ecx
        pushl   sys_pct_after
        movl    $0x59,%ecx
        pushal
        movl    $0x62,%ecx
        pushf
        movl    $0x60,%ecx
        movl    %esp, _crt0_saved_sp
        movl    $0x61,%ecx
        movl    $0x57,%ecx
        int     $0x47

The prototype is:
void sys_pct (int pid);

All the movl	$xx,%ecx are debugging
t2 crashes with ECX=3D59 everytime (and I've put delay loops in to check it=
 isn't
a timing thing).

CS =3D 0x1b
DS =3D 0x23
SS =3D 0x00100023
(that 1 is there again, but pushl sys_pct_after works...)
EIP=3D 0xc35832eb
ESP=3D 0x10001d0c
(there's room on the stack yet)

It must be that pushal crashing I think (because if it ever finished ECX wo=
uld
change). But how does EIP go so wonkey?

AGL