Date: Thu, 5 Apr 2018 21:33:30 -0500 From: Benjamin Kaduk <bjk@freebsd.org> To: Steve Kargl <sgk@troutmask.apl.washington.edu> Cc: Ed Maste <emaste@freebsd.org>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: Can't load linux64.ko module Message-ID: <20180406023330.GI80088@mit.edu> In-Reply-To: <20180404213453.GA35165@troutmask.apl.washington.edu> References: <20180403162600.GA23894@troutmask.apl.washington.edu> <CAPyFy2D7dkUO929htg4Qxu6jQXgc2M4J1fFtd2s_2gZ5wKK3-w@mail.gmail.com> <20180404190902.GA34292@troutmask.apl.washington.edu> <20180404201955.GA34736@troutmask.apl.washington.edu> <20180404211315.GA35006@troutmask.apl.washington.edu> <20180404213453.GA35165@troutmask.apl.washington.edu>
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On Wed, Apr 04, 2018 at 02:34:53PM -0700, Steve Kargl wrote: > > The answer is compat/linux/linux_vdso.c where we find > > #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32)) > #define __ELF_WORD_SIZE 32 > #else > #define __ELF_WORD_SIZE 64 > #endif > > having COMPAT_LINUX32 in my kernel config file gives me > elf32_linux_vdso_fixup. It seems that one cannot have > a kernel that supports both 32 and 64-bit linux software. > > linux(4) states > > for an amd64 kernel use: > > options COMPAT_LINUX32 > > Alternatively, to load the ABI as a module at boot time, place the > following line in loader.conf(5): > > linux_load="YES" > > It turns out that I have 'linux_load=YES" in /etc/loader.conf. > When I boot the kernel built with COMPAT_LINUX32 prevents > the kldload of linux64.ko. Yes, building the linuxulator statically into the kernel forces only a single ABI to be possible. If dynamic modules are used for all three relevant modules, then it is possible to simultaneously support 32- and 64-bit linux code. This is (perhaps obliquely) documented at https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/linuxemu-lbc-install.html which I added after a similar thread on -current last July. -Ben
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