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Re: [ARM/FDPIC v5 00/21] FDPIC ABI for ARM


ping^5?

On Mon, 1 Jul 2019 at 14:15, Christophe Lyon <christophe.lyon@linaro.org> wrote:
>
> ping^4 ?
> https://gcc.gnu.org/ml/gcc-patches/2019-05/msg00817.html
>
> On Mon, 17 Jun 2019 at 13:41, Christophe Lyon
> <christophe.lyon@linaro.org> wrote:
> >
> > ping^3 ?
> >
> > On Thu, 6 Jun 2019 at 14:36, Christophe Lyon <christophe.lyon@linaro.org> wrote:
> > >
> > > Hi,
> > >
> > > If this makes review easier, here are the areas covered by the patches:
> > >
> > > - patches 1,3,4,7,8,9,10,12,21: target-specific
> > > - patch 2: configure
> > > - patch 5,6,11,13: generic parts, undef #if defined(__FDPIC__)
> > > - patches 14-20: testsuite
> > >
> > > Christophe
> > >
> > > On Tue, 4 Jun 2019 at 14:57, Christophe Lyon <christophe.lyon@linaro.org> wrote:
> > > >
> > > > Ping?
> > > >
> > > >
> > > > On Thu, 23 May 2019 at 14:46, Christophe Lyon <christophe.lyon@st.com> wrote:
> > > > >
> > > > > Ping?
> > > > >
> > > > > Any feedback other than what I got on patch 03/21 ?
> > > > >
> > > > > Thanks,
> > > > >
> > > > > Christophe
> > > > >
> > > > >
> > > > > On 15/05/2019 14:39, Christophe Lyon wrote:
> > > > > > 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 a few
> > > > > > months ago. [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
> > > > > > a few more failures than arm-linux-gnueabi, but is quite functional.
> > > > > >
> > > > > > I have also booted an STM32 board (stm32f469) which uses a cortex-m4
> > > > > > with linux-4.20.17 and ran successfully several tools.
> > > > > >
> > > > > > Are the GCC patches OK for inclusion in master?
> > > > > >
> > > > > > Changes between v4 and v5:
> > > > > > - rebased on top of recent gcc-10 master (April 26th, 2019)
> > > > > > - fixed handling of stack-protector combined patterns in FDPIC mode
> > > > > >
> > > > > > 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 (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 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
> > > > > >    [ARM] FDPIC: Handle stack-protector combined patterns
> > > > > >
> > > > > >   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                              | 151 ++++++-
> > > > > >   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, 1233 insertions(+), 219 deletions(-)
> > > > > >   create mode 100644 gcc/config/arm/uclinuxfdpiceabi.h
> > > > > >
> > > > >


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