Hi, Ping^4 ?
Thanks, Christophe On Tue, 11 Dec 2018 at 11:27, Christophe Lyon <christophe.l...@st.com> wrote: > > Ping? > > > On 03/12/2018 10:19, Christophe Lyon wrote: > > Ping? > > > > The series started here: > > https://gcc.gnu.org/ml/gcc-patches/2018-11/msg01464.html > > > > Thanks, > > > > Christophe > > > > On Mon, 26 Nov 2018 at 11:14, Christophe Lyon > > <christophe.l...@linaro.org> wrote: > >> > >> Ping? > >> > >> Thanks > >> > >> On Fri, 16 Nov 2018 at 16:48, Christophe Lyon <christophe.l...@st.com> > >> wrote: > >>> > >>> From: Christophe Lyon <christophe.l...@linaro.org> > >>> > >>> Hello, > >>> > >>> This patch series implements the GCC contribution of the FDPIC ABI for > >>> ARM targets. > >>> > >>> This ABI enables to run Linux on ARM MMU-less cores and supports > >>> shared libraries to reduce the memory footprint. > >>> > >>> Without MMU, text and data segments relative distances are different > >>> from one process to another, hence the need for a dedicated FDPIC > >>> register holding the start address of the data segment. One of the > >>> side effects is that function pointers require two words to be > >>> represented: the address of the code, and the data segment start > >>> address. These two words are designated as "Function Descriptor", > >>> hence the "FD PIC" name. > >>> > >>> On ARM, the FDPIC register is r9 [1], and the target name is > >>> arm-uclinuxfdpiceabi. Note that arm-uclinux exists, but uses another > >>> ABI and the BFLAT file format; it does not support code sharing. > >>> The -mfdpic option is enabled by default, and -mno-fdpic should be > >>> used to build the Linux kernel. > >>> > >>> This work was developed some time ago by STMicroelectronics, and was > >>> presented during Linaro Connect SFO15 (September 2015). You can watch > >>> the discussion and read the slides [2]. > >>> This presentation was related to the toolchain published on github [3], > >>> which is based on binutils-2.22, gcc-4.7, uclibc-0.9.33.2, gdb-7.5.1 > >>> and qemu-2.3.0, and for which pre-built binaries are available [3]. > >>> > >>> The ABI itself is described in details in [1]. > >>> > >>> Our Linux kernel patches have been updated and committed by Nicolas > >>> Pitre (Linaro) in July 2017. They are required so that the loader is > >>> able to handle this new file type. Indeed, the ELF files are tagged > >>> with ELFOSABI_ARM_FDPIC. This new tag has been allocated by ARM, as > >>> well as the new relocations involved. > >>> > >>> The binutils, QEMU and uclibc-ng patch series have been merged > >>> recently. [4][5][6] > >>> > >>> This series provides support for architectures that support ARM and/or > >>> Thumb-2 and has been tested on arm-linux-gnueabi without regression, > >>> as well as arm-uclinuxfdpiceabi, using QEMU. arm-uclinuxfdpiceabi has > >>> more failures than arm-linux-gnueabi, but is quite functional. > >>> > >>> Are the GCC patches OK for inclusion in master? > >>> > >>> Changes between v3 and v4: > >>> > >>> - improved documentation (patch 1) > >>> - emit an error message (sorry) if the target architecture does not > >>> support arm nor thumb-2 modes (patch 4) > >>> - handle Richard's comments on patch 4 (comments, unspec) > >>> - added .align directive (patch 5) > >>> - fixed use of kernel helpers (__kernel_cmpxchg, __kernel_dmb) (patch 6) > >>> - code factorization in patch 7 > >>> - typos/internal function name in patch 8 > >>> - improved patch 12 > >>> - dropped patch 16 > >>> - patch 20 introduces arm_arch*_thumb_ok effective targets to help > >>> skip some tests > >>> - I tested patch 2 on xtensa-buildroot-uclinux-uclibc, it adds many > >>> new tests, but a few regressions > >>> (https://gcc.gnu.org/ml/gcc-patches/2018-11/msg00713.html) > >>> - I compiled and executed several LTP tests to exercise pthreads and > >>> signals > >>> - I wrote and executed a simple testcase to change the interaction > >>> with __kernel_cmpxchg (ie. call the kernel helper rather than use an > >>> implementation in libgcc as requested by Richard) > >>> > >>> Changes between v2 and v3: > >>> - added doc entry for -mfdpic new option > >>> - took Kyrill's comments into account (use "Armv7" instead of "7", > >>> code factorization, use preprocessor instead of hard-coding "r9", > >>> remove leftover code for thumb1 support, fixed comments) > >>> - rebase over recent trunk > >>> - patches with changes: 1, 2 (commit message), 3 (rebase), 4, 6, 7, 9, > >>> 14 (rebase), 19 (rebase) > >>> > >>> Changes between v1 and v2: > >>> - fix GNU coding style > >>> - exit with an error for pre-Armv7 > >>> - use ACLE __ARM_ARCH and remove dead code for pre-Armv4 > >>> - remove unsupported attempts of pre-Armv7/thumb1 support > >>> - add instructions in comments next to opcodes > >>> - merge patches 11 and 13 > >>> - fixed protected visibility handling in patch 8 > >>> - merged legitimize_tls_address_fdpic and > >>> legitimize_tls_address_not_fdpic as requested > >>> > >>> Thanks, > >>> > >>> Christophe. > >>> > >>> > >>> [1] https://github.com/mickael-guene/fdpic_doc/blob/master/abi.txt > >>> [2] > >>> http://connect.linaro.org/resource/sfo15/sfo15-406-arm-fdpic-toolset-kernel-libraries-for-cortex-m-cortex-r-mmuless-cores/ > >>> [3] https://github.com/mickael-guene/fdpic_manifest > >>> [4] > >>> https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commit;h=f1ac0afe481e83c9a33f247b81fa7de789edc4d9 > >>> [5] > >>> https://git.qemu.org/?p=qemu.git;a=commit;h=e8fa72957419c11984608062c7dcb204a6003a06 > >>> [6] > >>> https://cgit.uclibc-ng.org/cgi/cgit/uclibc-ng.git/commit/?id=13c46fbc1e5a021f2b9ed32d83aecc93ae5e655d > >>> > >>> Christophe Lyon (20): > >>> [ARM] FDPIC: Add -mfdpic option support > >>> [ARM] FDPIC: Handle arm*-*-uclinuxfdpiceabi in configure scripts > >>> [ARM] FDPIC: Force FDPIC related options unless -mno-fdpic is provided > >>> [ARM] FDPIC: Add support for FDPIC for arm architecture > >>> [ARM] FDPIC: Fix __do_global_dtors_aux and frame_dummy generation > >>> [ARM] FDPIC: Add support for c++ exceptions > >>> [ARM] FDPIC: Avoid saving/restoring r9 on stack since it is read-only > >>> [ARM] FDPIC: Enforce local/global binding for function descriptors > >>> [ARM] FDPIC: Add support for taking address of nested function > >>> [ARM] FDPIC: Implement TLS support. > >>> [ARM] FDPIC: Add support to unwind FDPIC signal frame > >>> [ARM] FDPIC: Restore r9 after we call __aeabi_read_tp > >>> [ARM] FDPIC: Force LSB bit for PC in Cortex-M architecture > >>> [ARM][testsuite] FDPIC: Skip unsupported tests > >>> [ARM][testsuite] FDPIC: Adjust scan-assembler patterns. > >>> [ARM][testsuite] FDPIC: Skip tests that don't work in PIC mode > >>> [ARM][testsuite] FDPIC: Handle *-*-uclinux* > >>> [ARM][testsuite] FDPIC: Enable tests on pie_enabled targets > >>> [ARM][testsuite] FDPIC: Adjust pr43698.c to avoid clash with uclibc. > >>> [ARM][testsuite] FDPIC: Skip tests using architectures unsupported by > >>> FDPIC > >>> > >>> config/futex.m4 | 2 +- > >>> config/tls.m4 | 2 +- > >>> gcc/config.gcc | 13 +- > >>> gcc/config/arm/arm-c.c | 2 + > >>> gcc/config/arm/arm-protos.h | 1 + > >>> gcc/config/arm/arm.c | 485 > >>> ++++++++++++++++++--- > >>> gcc/config/arm/arm.h | 16 +- > >>> gcc/config/arm/arm.md | 125 +++++- > >>> gcc/config/arm/arm.opt | 4 + > >>> gcc/config/arm/bpabi.h | 4 +- > >>> gcc/config/arm/linux-eabi.h | 7 +- > >>> gcc/config/arm/uclinuxfdpiceabi.h | 53 +++ > >>> gcc/config/arm/unspecs.md | 1 + > >>> gcc/doc/invoke.texi | 20 +- > >>> gcc/ginclude/unwind-arm-common.h | 2 +- > >>> gcc/testsuite/g++.dg/abi/forced.C | 2 +- > >>> gcc/testsuite/g++.dg/abi/guard2.C | 2 +- > >>> gcc/testsuite/g++.dg/cpp0x/noexcept03.C | 2 +- > >>> gcc/testsuite/g++.dg/ext/cleanup-10.C | 2 +- > >>> gcc/testsuite/g++.dg/ext/cleanup-11.C | 2 +- > >>> gcc/testsuite/g++.dg/ext/cleanup-8.C | 2 +- > >>> gcc/testsuite/g++.dg/ext/cleanup-9.C | 2 +- > >>> gcc/testsuite/g++.dg/ext/sync-4.C | 2 +- > >>> gcc/testsuite/g++.dg/ipa/comdat.C | 2 +- > >>> gcc/testsuite/g++.dg/ipa/devirt-c-7.C | 3 +- > >>> gcc/testsuite/g++.dg/ipa/ivinline-1.C | 2 +- > >>> gcc/testsuite/g++.dg/ipa/ivinline-2.C | 2 +- > >>> gcc/testsuite/g++.dg/ipa/ivinline-3.C | 2 +- > >>> gcc/testsuite/g++.dg/ipa/ivinline-4.C | 2 +- > >>> gcc/testsuite/g++.dg/ipa/ivinline-5.C | 2 +- > >>> gcc/testsuite/g++.dg/ipa/ivinline-7.C | 2 +- > >>> gcc/testsuite/g++.dg/ipa/ivinline-8.C | 2 +- > >>> gcc/testsuite/g++.dg/ipa/ivinline-9.C | 2 +- > >>> gcc/testsuite/g++.dg/other/anon5.C | 1 + > >>> gcc/testsuite/g++.dg/tls/pr79288.C | 2 +- > >>> gcc/testsuite/gcc.c-torture/compile/pr82096.c | 2 +- > >>> gcc/testsuite/gcc.dg/20020312-2.c | 1 + > >>> gcc/testsuite/gcc.dg/20041106-1.c | 2 +- > >>> gcc/testsuite/gcc.dg/addr_equal-1.c | 3 +- > >>> gcc/testsuite/gcc.dg/cleanup-10.c | 2 +- > >>> gcc/testsuite/gcc.dg/cleanup-11.c | 2 +- > >>> gcc/testsuite/gcc.dg/cleanup-8.c | 2 +- > >>> gcc/testsuite/gcc.dg/cleanup-9.c | 2 +- > >>> gcc/testsuite/gcc.dg/const-1.c | 2 +- > >>> gcc/testsuite/gcc.dg/fdata-sections-1.c | 2 +- > >>> gcc/testsuite/gcc.dg/fdata-sections-2.c | 2 +- > >>> gcc/testsuite/gcc.dg/ipa/pure-const-1.c | 2 +- > >>> gcc/testsuite/gcc.dg/noreturn-8.c | 2 +- > >>> gcc/testsuite/gcc.dg/pr33826.c | 3 +- > >>> gcc/testsuite/gcc.dg/pr39323-1.c | 2 +- > >>> gcc/testsuite/gcc.dg/pr39323-2.c | 2 +- > >>> gcc/testsuite/gcc.dg/pr39323-3.c | 2 +- > >>> gcc/testsuite/gcc.dg/pr65780-1.c | 2 +- > >>> gcc/testsuite/gcc.dg/pr65780-2.c | 2 +- > >>> gcc/testsuite/gcc.dg/pr67338.c | 2 +- > >>> gcc/testsuite/gcc.dg/pr78185.c | 2 +- > >>> gcc/testsuite/gcc.dg/pr83100-1.c | 2 +- > >>> gcc/testsuite/gcc.dg/pr83100-4.c | 2 +- > >>> gcc/testsuite/gcc.dg/strlenopt-12g.c | 2 +- > >>> gcc/testsuite/gcc.dg/strlenopt-14g.c | 2 +- > >>> gcc/testsuite/gcc.dg/strlenopt-14gf.c | 2 +- > >>> gcc/testsuite/gcc.dg/strlenopt-16g.c | 2 +- > >>> gcc/testsuite/gcc.dg/strlenopt-17g.c | 2 +- > >>> gcc/testsuite/gcc.dg/strlenopt-18g.c | 2 +- > >>> gcc/testsuite/gcc.dg/strlenopt-1f.c | 2 +- > >>> gcc/testsuite/gcc.dg/strlenopt-22g.c | 2 +- > >>> gcc/testsuite/gcc.dg/strlenopt-2f.c | 2 +- > >>> gcc/testsuite/gcc.dg/strlenopt-31g.c | 2 +- > >>> gcc/testsuite/gcc.dg/strlenopt-33g.c | 2 +- > >>> gcc/testsuite/gcc.dg/strlenopt-4g.c | 2 +- > >>> gcc/testsuite/gcc.dg/strlenopt-4gf.c | 2 +- > >>> gcc/testsuite/gcc.dg/strncmp-2.c | 2 +- > >>> gcc/testsuite/gcc.dg/struct-ret-3.c | 2 +- > >>> gcc/testsuite/gcc.dg/torture/ipa-pta-1.c | 2 +- > >>> gcc/testsuite/gcc.dg/torture/pr69760.c | 2 +- > >>> gcc/testsuite/gcc.dg/tree-ssa/alias-2.c | 2 +- > >>> gcc/testsuite/gcc.dg/tree-ssa/ipa-split-5.c | 2 +- > >>> gcc/testsuite/gcc.dg/tree-ssa/loadpre6.c | 2 +- > >>> gcc/testsuite/gcc.target/arm/20051215-1.c | 1 + > >>> .../gcc.target/arm/armv6-unaligned-load-ice.c | 1 + > >>> .../gcc.target/arm/attr-unaligned-load-ice.c | 1 + > >>> gcc/testsuite/gcc.target/arm/attr_arm-err.c | 1 + > >>> gcc/testsuite/gcc.target/arm/data-rel-2.c | 1 + > >>> gcc/testsuite/gcc.target/arm/data-rel-3.c | 1 + > >>> gcc/testsuite/gcc.target/arm/div64-unwinding.c | 2 +- > >>> gcc/testsuite/gcc.target/arm/eliminate.c | 2 +- > >>> gcc/testsuite/gcc.target/arm/ftest-armv4-arm.c | 1 + > >>> gcc/testsuite/gcc.target/arm/ftest-armv4t-arm.c | 1 + > >>> gcc/testsuite/gcc.target/arm/ftest-armv4t-thumb.c | 1 + > >>> gcc/testsuite/gcc.target/arm/ftest-armv5t-arm.c | 1 + > >>> gcc/testsuite/gcc.target/arm/ftest-armv5t-thumb.c | 1 + > >>> gcc/testsuite/gcc.target/arm/ftest-armv5te-arm.c | 1 + > >>> gcc/testsuite/gcc.target/arm/ftest-armv5te-thumb.c | 1 + > >>> gcc/testsuite/gcc.target/arm/ftest-armv6-arm.c | 1 + > >>> gcc/testsuite/gcc.target/arm/ftest-armv6-thumb.c | 1 + > >>> gcc/testsuite/gcc.target/arm/ftest-armv6k-arm.c | 1 + > >>> gcc/testsuite/gcc.target/arm/ftest-armv6k-thumb.c | 1 + > >>> gcc/testsuite/gcc.target/arm/ftest-armv6m-thumb.c | 1 + > >>> gcc/testsuite/gcc.target/arm/ftest-armv6t2-arm.c | 1 + > >>> gcc/testsuite/gcc.target/arm/ftest-armv6t2-thumb.c | 1 + > >>> gcc/testsuite/gcc.target/arm/ftest-armv6z-arm.c | 1 + > >>> gcc/testsuite/gcc.target/arm/ftest-armv6z-thumb.c | 1 + > >>> gcc/testsuite/gcc.target/arm/g2.c | 1 + > >>> gcc/testsuite/gcc.target/arm/interrupt-1.c | 6 +- > >>> gcc/testsuite/gcc.target/arm/interrupt-2.c | 6 +- > >>> gcc/testsuite/gcc.target/arm/ivopts-2.c | 2 +- > >>> gcc/testsuite/gcc.target/arm/ivopts-3.c | 2 +- > >>> gcc/testsuite/gcc.target/arm/ivopts-4.c | 2 +- > >>> gcc/testsuite/gcc.target/arm/ivopts-5.c | 2 +- > >>> gcc/testsuite/gcc.target/arm/macro_defs1.c | 1 + > >>> gcc/testsuite/gcc.target/arm/mmx-1.c | 1 + > >>> gcc/testsuite/gcc.target/arm/pr19599.c | 1 + > >>> gcc/testsuite/gcc.target/arm/pr40887.c | 1 + > >>> gcc/testsuite/gcc.target/arm/pr43597.c | 2 +- > >>> gcc/testsuite/gcc.target/arm/pr43698.c | 4 +- > >>> gcc/testsuite/gcc.target/arm/pr43920-2.c | 2 +- > >>> gcc/testsuite/gcc.target/arm/pr45701-1.c | 4 +- > >>> gcc/testsuite/gcc.target/arm/pr45701-2.c | 4 +- > >>> gcc/testsuite/gcc.target/arm/pr59858.c | 1 + > >>> gcc/testsuite/gcc.target/arm/pr61948.c | 1 + > >>> gcc/testsuite/gcc.target/arm/pr65647-2.c | 1 + > >>> gcc/testsuite/gcc.target/arm/pr66912.c | 2 +- > >>> gcc/testsuite/gcc.target/arm/pr70830.c | 3 +- > >>> gcc/testsuite/gcc.target/arm/pr77933-1.c | 1 + > >>> gcc/testsuite/gcc.target/arm/pr77933-2.c | 1 + > >>> gcc/testsuite/gcc.target/arm/pr79058.c | 1 + > >>> gcc/testsuite/gcc.target/arm/pr83712.c | 1 + > >>> .../gcc.target/arm/pragma_arch_switch_2.c | 1 + > >>> gcc/testsuite/gcc.target/arm/scd42-1.c | 1 + > >>> gcc/testsuite/gcc.target/arm/scd42-2.c | 1 + > >>> gcc/testsuite/gcc.target/arm/scd42-3.c | 1 + > >>> gcc/testsuite/gcc.target/arm/sibcall-1.c | 1 + > >>> gcc/testsuite/gcc.target/arm/stack-checking.c | 2 +- > >>> gcc/testsuite/gcc.target/arm/stack-red-zone.c | 2 +- > >>> gcc/testsuite/gcc.target/arm/synchronize.c | 2 +- > >>> gcc/testsuite/gcc.target/arm/tail-long-call.c | 1 + > >>> gcc/testsuite/gcc.target/arm/tlscall.c | 1 + > >>> gcc/testsuite/gcc.target/arm/vfp-longcall-apcs.c | 1 + > >>> gcc/testsuite/lib/target-supports.exp | 10 + > >>> libatomic/configure | 8 +- > >>> libatomic/configure.tgt | 2 +- > >>> libgcc/config.host | 4 +- > >>> libgcc/config/arm/linux-atomic.c | 55 ++- > >>> libgcc/config/arm/unwind-arm.c | 5 + > >>> libgcc/config/arm/unwind-arm.h | 31 +- > >>> libgcc/crtstuff.c | 18 + > >>> libgcc/unwind-arm-common.inc | 216 +++++++++ > >>> libgcc/unwind-pe.h | 17 + > >>> libitm/configure | 20 +- > >>> libitm/configure.tgt | 2 +- > >>> libsanitizer/configure.tgt | 3 + > >>> libstdc++-v3/acinclude.m4 | 12 +- > >>> libstdc++-v3/configure | 36 +- > >>> libstdc++-v3/configure.host | 6 +- > >>> libstdc++-v3/libsupc++/eh_personality.cc | 10 +- > >>> libtool.m4 | 14 +- > >>> 156 files changed, 1209 insertions(+), 217 deletions(-) > >>> create mode 100644 gcc/config/arm/uclinuxfdpiceabi.h > >>> > >>> -- > >>> 2.6.3 > >>> > > . > > >
