Date: Tue, 23 Apr 2002 10:14:59 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Kenneth Culver <culverk@yumyumyum.org> Cc: freebsd-hackers@freebsd.org, freebsd-emulation@freebsd.org Subject: Re: implementing linux mmap2 syscall Message-ID: <15557.27747.802212.659760@grasshopper.cs.duke.edu> In-Reply-To: <200204222313.29181.culverk@yumyumyum.org> References: <200204211525.08827.culverk@yumyumyum.org> <15556.6399.62081.426193@grasshopper.cs.duke.edu> <200204222313.29181.culverk@yumyumyum.org>
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Kenneth Culver writes:
> OK, I found another problem, here it is:
>
> 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 */
> }
>
> Basically, linux_mmap2 takes 6 args, and this looks here like only 5 args are
> making it in... I checked this because the sixth argument to linux_mmap2() in
> truss was showing 0x6, but when I printed out that arg from the kernel, it
> was showing 0x0. Am I correct here?
>
> Ken
Yes. According to http://john.fremlin.de/linux/asm/, linux used to
parse only 5 args but now it parses six. Try adding:
args[5] = tf->tf_ebp;
Drew
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