Re: Need help with assembly code

[Samuel Thibault]

Svante Signell, le mar. 30 nov. 2021 11:27:09 +0100, a ecrit:
> On Mon, 2021-11-29 at 22:19 +0100, Samuel Thibault wrote:
> > > Seems like one have to make a suitable mix of linux and darwin code
> > > (and to some extent freebsd/solaris code).
> > 
> > Also it'd need a fair amount of code to reimplement the basic posixish
> > needs of valgrind in terms of the Hurd RPCs.
> 
> Do you mean that Darwin does not use RPCs?

I don't know, but for sure its set of RPCs will have nothing to do with
the Hurd set of RPCs.

> > >         movl    $$__NR___pthread_sigmask, %eax        
> > >         int     $$0x80  /* should be sysenter? */
> > >         jc      L_$0_7  /* __pthread_sigmask failed */
> 
> > Mach doesn't use int 0x80 but an lcall. See for instance
> > glibc/sysdeps/mach/i386/syscall.S
> 
> Can't 0x80 just be replaced by lcall?

Possibly, but also the calling convention needs to be fixed for passing
parameters etc.

Samuel