Date: Wed, 24 Apr 2002 21:16:04 -0400 (EDT) From: Kenneth Culver <culverk@alpha.yumyumyum.org> To: Peter Wemm <peter@wemm.org> Cc: John Baldwin <jhb@FreeBSD.ORG>, FreeBSD-CURRENT List <freebsd-current@FreeBSD.ORG>, <freebsd-hackers@FreeBSD.ORG>, Brandon S Allbery KF8NH <allbery@ece.cmu.edu>, Andrew Gallatin <gallatin@cs.duke.edu> Subject: Re: implementing linux mmap2 syscall Message-ID: <20020424210936.S40254-100000@alpha.yumyumyum.org> In-Reply-To: <20020424200635.J39942-100000@alpha.yumyumyum.org>
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> yeah, I did that already, and have been running with that since yesterday
> :-P
>
> still not working right though... I think it has something to do with that
> nargs thing... I'm checking that out now...
>
Ehh, apparently sy_narg is getting set correctly too:
struct linux_mmap2_args {
l_ulong addr; char addr_[PAD_(l_ulong)];
l_ulong len; char len_[PAD_(l_ulong)];
l_ulong prot; char prot_[PAD_(l_ulong)];
l_ulong flags; char flags_[PAD_(l_ulong)];
l_ulong fd; char fd_[PAD_(l_ulong)];
l_ulong pgoff; char pgoff_[PAD_(l_ulong)];
};
#define AS(name) (sizeof(struct name) / sizeof(register_t))
{ AS(linux_mmap2_args), (sy_call_t *)linux_mmap2 }
not that it really matters, the linux_prepsyscall is setting the params to
null:
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;
args[5] = tf->tf_ebp;
*params = NULL; /* no copyin */
}
so the code in syscall2 will not even bother to try to copy in the args...
it just uses whatever linux_prepsyscall tells it to use, and completely
ignores nargs... at least as far as I can tell...
Ken
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