Subject: Re: m88k system call convention
To: Toru Nishimura <firstname.lastname@example.org>
From: Allen Briggs <email@example.com>
Date: 02/12/2000 19:30:12
> Alas... I could figure out 'args-on-stack' case only happens 'indirect
> mmap'. All other cases comfortably fit in 'args-in-trapframe' case.
> Tentative sketch of syscall() would look like;
Looks good to me. I can certainly understand your concern with changing
the argument passing semantics to use r10-r12. I had forgotten about
the SYS_[_]syscall cases.
> error = copyin(
> (void *)(frame->r31 + 8 * sizeof(register_t)),
> (void *)((caddr_t)args + argsize),
> callp->sy_argsize - argsize);
What are the 8 words that you are passing over here? I followed the
rest, with appropriate variable name changes... (uargsused/nargsused,
Thank you for your patience with me.