Date: Wed, 18 Sep 2013 09:15:54 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Rui Paulo <rpaulo@FreeBSD.org> Cc: FreeBSD Mailing List <freebsd-hackers@freebsd.org> Subject: Re: mmap on emulated i386 Message-ID: <20130918061554.GV41229@kib.kiev.ua> In-Reply-To: <31F58652-AB49-4B52-91C0-17A017350903@FreeBSD.org> References: <31F58652-AB49-4B52-91C0-17A017350903@FreeBSD.org>
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On Tue, Sep 17, 2013 at 07:01:16PM -0700, Rui Paulo wrote:
> Hi,
>=20
> I'm trying to figure out why the following fails when compiled on amd64 w=
ith -m32:
>=20
> mmap(NULL, 0x70000, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE=
, -1, 0);
>=20
> It returns EINVAL. I looked around everywhere but I couldn't find where t=
he EINVAL is coming from. The length argument doesn't really make any diffe=
rence. At this point I'm thinking it's a bug...
What is the version of your system, including the userspace ? -m32 only
works on HEAD. Do you have r255657/r255658 in your kernel ?
Please provide kdump of the ktraced execution of your test program, as
well as the test program itself.
N.B. The following worked fine for me, both in 64 and 32 bit binary.
#include <sys/mman.h>
#include <err.h>
#include <stdlib.h>
int
main(void)
{
char *p;
p =3D mmap(NULL, 0x70000, PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_ANON | MAP_PRIVATE, -1, 0);
if (p =3D=3D MAP_FAILED)
err(1, "mmap");
return (0);
}
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