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Re: [ARM/FDPIC v2 00/21] FDPIC ABI for ARM


Ping?

The original thread started at:
https://gcc.gnu.org/ml/gcc-patches/2018-07/msg00707.html
On Fri, 17 Aug 2018 at 00:19, Christophe Lyon
<christophe.lyon@linaro.org> wrote:
>
> Ping?
>
> Le mer. 1 août 2018 à 10:03, Christophe Lyon <christophe.lyon@st.com> a écrit :
>>
>> Ping?
>>
>>
>> On 13/07/2018 18:10, christophe.lyon@st.com wrote:
>> > From: Christophe Lyon <christophe.lyon@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 and QEMU patch series have been merged recently. [4][5]
>> >
>> > To build such a toolchain, you'd also need to use my uClibc branch[6].
>> > I have posted uclibc-ng patches for review [7]
>> >
>> > I am currently working on updating the patches for the remaining
>> > toolchain components: uclibc and gdb.
>> >
>> > This series provides support for ARM v7 architecture 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 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://git.linaro.org/people/christophe.lyon/uclibc.git/log/?h=uClibc-0.9.33.2-fdpic-upstream
>> > [7] https://mailman.uclibc-ng.org/pipermail/devel/2018-July/001705.html
>> >
>> > Christophe Lyon (21):
>> >    [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 RO
>> >    [ARM] FDPIC: Ensure 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 v8-m and v6-m tests that currently
>> >      produce an ICE
>> >    [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 architecture older than v7
>> >
>> >   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                               | 507 ++++++++++++++++++---
>> >   gcc/config/arm/arm.h                               |   9 +-
>> >   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/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.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.dg/uninit-19.c                   |   4 +-
>> >   gcc/testsuite/gcc.target/arm/20051215-1.c          |   1 +
>> >   .../gcc.target/arm/armv6-unaligned-load-ice.c      |   1 +
>> >   .../arm/atomic-comp-swap-release-acquire-3.c       |   1 +
>> >   gcc/testsuite/gcc.target/arm/atomic-op-acq_rel-3.c |   1 +
>> >   gcc/testsuite/gcc.target/arm/atomic-op-acquire-3.c |   1 +
>> >   gcc/testsuite/gcc.target/arm/atomic-op-char-3.c    |   1 +
>> >   gcc/testsuite/gcc.target/arm/atomic-op-consume-3.c |   1 +
>> >   gcc/testsuite/gcc.target/arm/atomic-op-int-3.c     |   1 +
>> >   gcc/testsuite/gcc.target/arm/atomic-op-relaxed-3.c |   1 +
>> >   gcc/testsuite/gcc.target/arm/atomic-op-release-3.c |   1 +
>> >   gcc/testsuite/gcc.target/arm/atomic-op-seq_cst-3.c |   1 +
>> >   gcc/testsuite/gcc.target/arm/atomic-op-short-3.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/pr65647.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              |   4 +
>> >   libatomic/configure                                |   8 +-
>> >   libatomic/configure.tgt                            |   2 +-
>> >   libgcc/config.host                                 |   4 +-
>> >   libgcc/config/arm/linux-atomic.c                   |  38 ++
>> >   libgcc/config/arm/unwind-arm.c                     |   5 +
>> >   libgcc/config/arm/unwind-arm.h                     |  26 +-
>> >   libgcc/crtstuff.c                                  |  16 +
>> >   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 +-
>> >   166 files changed, 1192 insertions(+), 212 deletions(-)
>> >   create mode 100644 gcc/config/arm/uclinuxfdpiceabi.h
>> >
>>


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