Re: FreeBSD/powerpc and FreeBSD/powerpcspe toolchain update

On 2019-Jun-24, at 19:40, Justin Hibbits <[email protected]> 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

make[4]: stopped in /usr/src/sys/modules/agp
.ERROR_TARGET='agp.ko.full'
.ERROR_META_FILE='/usr/obj/powerpcvtsc_clang/powerpc.powerpc/usr/src/powerpc.powerpc/sys/GENERICvtsc-NODBG/modules/usr/src/sys/modules/agp/agp.ko.full.meta'
.MAKE.LEVEL='4'
MAKEFILE=''
.MAKE.MODE='meta missing-filemon=yes missing-meta=yes silent=yes verbose'
_ERROR_CMD='ld -m elf32ppc_fbsd -Bshareable -znotext --secure-plt -d -warn-common  -o agp.ko.full agp.kld;'
.CURDIR='/usr/src/sys/modules/agp'
.MAKE='make'
.OBJDIR='/usr/obj/powerpcvtsc_clang/powerpc.powerpc/usr/src/powerpc.powerpc/sys/GENERICvtsc-NODBG/modules/usr/src/sys/modules/agp'
.TARGETS='all'
DESTDIR=''
LD_LIBRARY_PATH=''
MACHINE='powerpc'
MACHINE_ARCH='powerpc'
MAKEOBJDIRPREFIX='/usr/obj/powerpcvtsc_clang/powerpc.powerpc/usr/src/powerpc.powerpc/sys/GENERICvtsc-NODBG/modules'
MAKESYSPATH='/usr/src/share/mk'
MAKE_VERSION='20181221'
PATH='/usr/obj/powerpcvtsc_clang/powerpc.powerpc/usr/src/powerpc.powerpc/tmp/usr/sbin:/usr/obj/powerpcvtsc_clang/powerpc.powerpc/usr/src/powerpc.powerpc/tmp/usr/bin:/usr/obj/powerpcvtsc_clang/powerpc.powerpc/usr/src/powerpc.powerpc/tmp/legacy/usr/sbin:/usr/obj/powerpcvtsc_clang/powerpc.powerpc/usr/src/powerpc.powerpc/tmp/legacy/usr/bin:/usr/obj/powerpcvtsc_clang/powerpc.powerpc/usr/src/powerpc.powerpc/tmp/legacy/bin::/sbin:/bin:/usr/sbin:/usr/bin'
SRCTOP='/usr/src'
OBJTOP='/usr/obj/powerpcvtsc_clang/powerpc.powerpc/usr/src/powerpc.powerpc/sys/GENERICvtsc-NODBG/modules/usr/src'
.MAKE.MAKEFILES='/usr/src/share/mk/sys.mk /usr/src/share/mk/local.sys.env.mk /usr/src/share/mk/src.sys.env.mk /root/src.configs/src.conf.powerpc-clang-bootstrap.amd64-host /usr/src/share/mk/bsd.mkopt.mk /usr/src/share/mk/src.sys.obj.mk /usr/src/share/mk/auto.obj.mk /usr/src/share/mk/bsd.suffixes.mk /root/src.configs/make.conf /usr/src/share/mk/local.sys.mk /usr/src/share/mk/src.sys.mk /dev/null /usr/src/sys/modules/agp/Makefile /usr/src/share/mk/bsd.kmod.mk /usr/src/sys/conf/kmod.mk /usr/src/share/mk/bsd.init.mk /usr/src/share/mk/bsd.opts.mk /usr/src/share/mk/bsd.cpu.mk /usr/src/share/mk/local.init.mk /usr/src/share/mk/src.init.mk /usr/src/sys/modules/agp/../Makefile.inc /usr/src/share/mk/bsd.own.mk /usr/src/share/mk/bsd.compiler.mk /usr/src/share/mk/bsd.linker.mk /usr/src/sys/conf/kern.op
 ts.mk /usr/src/sys/conf/config.mk /usr/src/share/mk/bsd.links.mk /usr/src/share/mk/bsd.dep.mk /usr/src/share/mk/bsd.clang-analyze.mk /usr/src/share/mk/bsd.obj.mk /usr/src/share/mk/bsd.subdir.mk /usr
 /src/sys/conf/kern.mk'
.PATH='. /usr/src/sys/modules/agp /usr/src/sys/dev/agp /usr/obj/powerpcvtsc_clang/powerpc.powerpc/usr/src/powerpc.powerpc/sys/GENERICvtsc-NODBG'
1 error

This was based on:

# more ~/src.configs/src.conf.powerpc-clang-bootstrap.amd64-host 
TO_TYPE=powerpc
#
KERNCONF=GENERICvtsc-NODBG
TARGET=${TO_TYPE}
.if ${.MAKE.LEVEL} == 0
TARGET_ARCH=${TO_TYPE}
.export TARGET_ARCH
.endif
#
WITH_CROSS_COMPILER=
WITH_SYSTEM_COMPILER=
WITHOUT_SYSTEM_LINKER=
#
WITH_LIBCPLUSPLUS=
WITHOUT_LLD_BOOTSTRAP=
WITH_BINUTILS_BOOTSTRAP=
WITH_ELFTOOLCHAIN_BOOTSTRAP=
#Disables avoiding bootstrap: WITHOUT_LLVM_TARGET_ALL=
WITHOUT_LLVM_TARGET_AARCH64=
WITHOUT_LLVM_TARGET_ARM=
WITHOUT_LLVM_TARGET_MIPS=
WITH_LLVM_TARGET_POWERPC=
WITHOUT_LLVM_TARGET_SPARC=
WITHOUT_LLVM_TARGET_X86=
WITH_CLANG_BOOTSTRAP=
WITH_CLANG=
WITH_CLANG_IS_CC=
WITH_CLANG_FULL=
WITH_CLANG_EXTRAS=
WITHOUT_LLD=
WITH_BINTUILS=
# lldb requires missing atomic 8-byte operations for powerpc (non-64)
WITHOUT_LLDB=
#
WITH_BOOT=
WITHOUT_LIB32=
#
LOADER_DEFAULT_INTERP=4th
#
WITHOUT_GCC_BOOTSTRAP=
WITHOUT_GCC=
WITHOUT_GCC_IS_CC=
WITHOUT_GNUCXX=
#
NO_WERROR=
#
# Use WERROR to avoid stopping at the likes of:
# error: implicit conversion from 'int' to 'int8_t' (aka 'signed char') changes value from 128 to -128 [-Werror,-Wconstant-conversion]
WERROR=
MALLOC_PRODUCTION=
#
# Avoid stripping but do not control host -g status as well:
DEBUG_FLAGS+=
#
WITH_REPRODUCIBLE_BUILD=
WITH_DEBUG_FILES=



> I will submit ports updates for review in the next few days, so that
> ports can implicitly take advantage of secure-PLT as well.



===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)

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