Date: Fri, 23 May 2014 16:22:59 -0700 From: Peter Wemm <peter@wemm.org> To: Peter Jeremy <peter@rulingia.com>, freebsd-amd64@freebsd.org Subject: Re: i386 Go programs crash on amd64 Message-ID: <537FD853.3000505@wemm.org> In-Reply-To: <20140523225300.GA14433@server.rulingia.com> References: <20140523225300.GA14433@server.rulingia.com>
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On 5/23/14, 3:53 PM, Peter Jeremy wrote: > I've been playing with Go (lang/go) and found that i386 Go binaries > segfault when run on amd64 (9.x, 10.x or HEAD). I've narrowed it down > to the LDT handling but am not sure whether it's on the FreeBSD or Go > side. > > As far as I can see, the i386 binary is correctly calling i386_set_ldt() > and the i386_set_ldt() emulation in the amd64 kernel matches the i386 > kernel - but the net result doesn't work. > > Can anyone offer any suggestions as to how to resolve this? > We don't emulate i386_set_ldt(). The 32 bit version of libc on amd64 has a different implementation that calls sysarch(I386_SET_FSBASE, ..) and friends. Normally this is handled transparently by static linking, but obviously that's an issue for Go. -Peter
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