Date: Wed, 24 Apr 2002 20:06:09 -0400 (EDT) From: Kenneth Culver <culverk@alpha.yumyumyum.org> To: Peter Wemm <peter@wemm.org> Cc: Andrew Gallatin <gallatin@cs.duke.edu>, Brandon S Allbery KF8NH <allbery@ece.cmu.edu>, <freebsd-hackers@FreeBSD.ORG>, FreeBSD-CURRENT List <freebsd-current@FreeBSD.ORG> Subject: Re: implementing linux mmap2 syscall Message-ID: <20020424195920.D39879-100000@alpha.yumyumyum.org> In-Reply-To: <20020424235122.263FB38FD@overcee.wemm.org>
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> Here's where it happens:
> sys/i386/linux/linux_sysvec.c
>
> static void
> linux_prepsyscall(struct trapframe *tf, int *args, u_int *code, caddr_t *params)
> {
> args[0] = tf->tf_ebx;
> args[1] = tf->tf_ecx;
> args[2] = tf->tf_edx;
> args[3] = tf->tf_esi;
> args[4] = tf->tf_edi;
> *params = NULL; /* no copyin */
> }
>
> You probably want to add:
> args[5] = tf->tf_ebp;
> so that it ends up in the syscallargs struct.
Yeah, I did that... it still doesn't work, tf_ebp isn't getting set... So
I'm thinking that either I have a glibc that's too old, or something else
is wrong...
>
> For FreeBSD syscalls, we copy this from the top of stack for the number of
> 32 bit words specified in the syscall table in i386/trap.c:
> if (params && (i = narg * sizeof(int)) &&
> (error = copyin(params, (caddr_t)args, (u_int)i))) {
> (narg comes from the syscall table).
>
OK, that gives me an idea...
Ken
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