[ARM/FDPIC,v4,00/20] FDPIC ABI for ARM

Message ID 20181116154808.25154-1-christophe.lyon@st.com
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Series
  • FDPIC ABI for ARM
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Message

Christophe Lyon Nov. 16, 2018, 3:47 p.m.
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, 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

Comments

Christophe Lyon Nov. 26, 2018, 10:14 a.m. | #1
Ping?

Thanks

On Fri, 16 Nov 2018 at 16:48, Christophe Lyon <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, 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

>
Christophe Lyon Dec. 3, 2018, 9:19 a.m. | #2
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.lyon@linaro.org> wrote:
>

> Ping?

>

> Thanks

>

> On Fri, 16 Nov 2018 at 16:48, Christophe Lyon <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, 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

> >
Christophe Lyon Dec. 11, 2018, 10:26 a.m. | #3
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.lyon@linaro.org> wrote:

>>

>> Ping?

>>

>> Thanks

>>

>> On Fri, 16 Nov 2018 at 16:48, Christophe Lyon <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, 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

>>>

> .

>
Christophe Lyon Jan. 2, 2019, 11:43 a.m. | #4
Hi,

Ping^4 ?

Thanks,

Christophe



On Tue, 11 Dec 2018 at 11:27, Christophe Lyon <christophe.lyon@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.lyon@linaro.org> wrote:

> >>

> >> Ping?

> >>

> >> Thanks

> >>

> >> On Fri, 16 Nov 2018 at 16:48, Christophe Lyon <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, 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

> >>>

> > .

> >

>