Date: Fri, 5 May 2017 00:45:34 -0700 From: Mark Millard <markmi@dsl-only.net> To: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Cc: Dimitry Andric <dim@FreeBSD.org>, FreeBSD Toolchain <freebsd-toolchain@freebsd.org> Subject: Re: llvm FreeBSD powerpc ABI target bug fix: Re: [Bug 26519] Clang 4.0.0's "Target: powerpc-unknown-freebsd11.0" code generation is violating the SVR4 ABI (SEGV can result) Message-ID: <8F708AD1-055E-41BD-BD92-6A87C5FBAA60@dsl-only.net> In-Reply-To: <893ECA11-7C80-4D24-A496-92ADC7978A07@FreeBSD.org> References: <bug-26519-7604@http.bugs.llvm.org/> <bug-26519-7604-UhFFHDCAay@http.bugs.llvm.org/> <0103401A-CEEA-4992-A45E-E60EA151119B@dsl-only.net> <893ECA11-7C80-4D24-A496-92ADC7978A07@FreeBSD.org>
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On 2017-May-4, at 2:41 PM, Dimitry Andric <dim at FreeBSD.org> wrote: > On 4 May 2017, at 21:39, Mark Millard <markmi at dsl-only.net> wrote: >>=20 >> I just got a report of a fix for the FreeBSD >> powerpc ABI's code generation in llvm. It should >> fix a stack handling related problem that >> currently makes clang (through 4) largely useless >> for TARGET_ARCH=3Dpowerpc . >>=20 >> On 2017-May-4, at 12:26 PM, bugzilla-daemon@llvm.org wrote: >>=20 >>> Comment # 19 on bug 26519 from Krzysztof Parzyszek >>> Committed a fix in r302183. >>>=20 >>> You are receiving this mail because: >>> =E2=80=A2 You reported the bug. >>=20 >> This would also apply to: >>=20 >> powerpc-unknown-freebsd12.0 >>=20 >> not just 11.0 >>=20 >> Hopefully it is an easy merge into >> clang 4. >=20 > Thanks for the notice. I have merged the upstream fix into head in > r317810, and I will MFC it after a few days. I now have an old PowerMac running: # uname -paKU FreeBSD FBSDG4S 12.0-CURRENT FreeBSD 12.0-CURRENT r317820M powerpc = powerpc 1200030 1200030 where buildworld was via clang 4 (an amd64->powerpc cross build). Even the classic tiny program that previously showed C++ exception handling was broken and would crash the program now works when re-compiled and re-linked. Commands that were previous broken now work. (But my testing is nearly minimal at this point.) The kernel is from gcc421. I did try booting a kernel built by system-clang 4 and it got to: exec /sbin/init: error 13 and a later alignment exception at sf_buf_alloc+0x260 (Hand transcribed screen information.) This is the same as the last time that I tried such. The exception involved: exec_map_first_page kern_execve sys_execve start_init fork_exit fork_trampoline For the gcc 4.2.1 based kernel boot I have had one odd fatal kernel trap (0x903a64a, "unknown") where the lr showed 0x907f . It reported being stopped at: ffs_truncate+0x1080 It appears that "call doadump" worked but I've not looked at what was put in /var/crash/ . =3D=3D=3D Mark Millard markmi at dsl-only.net
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