Date: Thu, 27 Jun 2019 14:53:05 -0700 From: Mark Millard <marklmi@yahoo.com> To: Justin Hibbits <jrh29@alumni.cwru.edu> Cc: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: Re: FreeBSD/powerpc and FreeBSD/powerpcspe toolchain update Message-ID: <4B8DE338-8152-42CD-914C-35596FFDA76B@yahoo.com> In-Reply-To: <20190627145312.5abd82e7@titan.knownspace> References: <CAHSQbTBjZFb1dPk2FN=438i0FVtAKHYy-y22L%2BHFEDrTmd-9Aw@mail.gmail.com> <CE47F595-68EF-43A2-877B-61C1981AF9E7@yahoo.com> <20190627145312.5abd82e7@titan.knownspace>
index | next in thread | previous in thread | raw e-mail
On 2019-Jun-27, at 12:53, Justin Hibbits <jrh29 at alumni.cwru.edu> wrote:
> On Thu, 27 Jun 2019 12:03:05 -0700
> Mark Millard <marklmi@yahoo.com> wrote:
>
>> On 2019-Jun-24, at 19:40, Justin Hibbits <jrh29@alumni.cwru.edu>
>> wrote:
>>
>>> As of r349351 32-bit powerpc toolchains need to be rebuilt as part
>>> of buildworld, in order to take advantage of the new Secure
>>> Procedure Linkage Table (Secure-PLT) format. This can be done by
>>> passing "WITHOUT_SYSTEM_TOOLCHAIN=" on the 'make buildworld'
>>> command line.
>>>
>>> Cross-building should work fine with no changes, as that already
>>> builds a new toolchain. If building with an external toolchain,
>>> such as gcc8, add 'CFLAGS+= -msecure-plt' to /etc/src.conf to
>>> ensure the new PLT is used, otherwise it will default to BSS-PLT,
>>> which is fully compatible, but not as secure. There is breakage
>>> intended at all, so please let me know if there are any problems.
>>
>> My attempt to amd64->powerpc (32-bit) cross build from/to head
>> -r349444 via system clang and lld got the following. This may not be
>> a recent change. It has been a long time since I tried lld, instead
>> using devel/powerpc64-binutils. ( devel/powerpc64-binutils now fails
>> where it used to work, but I sent a separate note out about that. )
>>
>> --- agp.ko.full ---
>> ld: agp.kld(.text+0x37a4): R_PPC_PLTREL24 reloc against local symbol
>> agp.kld: could not read symbols: Bad value
>> *** [agp.ko.full] Error code 1
>>
>
> Hi Mark,
>
> Can you determine what symbol has that relocation? I don't see that
> error when building natively, or cross-building with base toolchain, so
> there's very likely a change in binutils between 2.17 and now that's
> leading to this failure.
Sure. readelf shows for agp.kld at 0x37a4 :
000037a4 00004512 R_PPC_PLTREL24 00000000 agp_find_caps + 0
and also shows for agp_find_caps:
69: 0000000000000000 172 FUNC LOCAL DEFAULT 1 agp_find_caps
(Note that I build with debug symbols., even for non-debug builds.)
===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)
home |
help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4B8DE338-8152-42CD-914C-35596FFDA76B>