From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 8186 invoked by alias); 29 Aug 2019 13:57:52 -0000 Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org Received: (qmail 8178 invoked by uid 89); 29 Aug 2019 13:57:52 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-12.6 required=5.0 tests=BAYES_00,GIT_PATCH_2,GIT_PATCH_3,KAM_SHORT,RCVD_IN_DNSWL_LOW,SPF_PASS autolearn=ham version=3.3.1 spammy=sk:legitim, 26th, interaction, ltp X-HELO: mx07-00178001.pphosted.com Received: from mx08-00178001.pphosted.com (HELO mx07-00178001.pphosted.com) (91.207.212.93) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Thu, 29 Aug 2019 13:57:48 +0000 Received: from pps.filterd (m0046661.ppops.net [127.0.0.1]) by mx08-00178001.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id x7TDu7nI028470 for ; Thu, 29 Aug 2019 15:57:45 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=st.com; h=subject : to : references : from : message-id : date : mime-version : in-reply-to : content-type : content-transfer-encoding; s=STMicroelectronics; bh=d3U8MeM+jbBFSGfcSeEZDpYMR/QXw0oUDhLF8Cx+830=; b=P0YsVqd7JnU3NEKdT8WrJY+dkQHm/WWL6UZ6F1bd29xGPsg1fL5Gcgc6YKWWgJBRjBs4 awFyZGzn/4mgXANj2m7fmsBMYkkOrYriZEkoImWiJKFfZN8BcoBrH6XRjqGzJagnzEY/ oO35U8eaQjiKwvGMQ73KYasPTeYp4bEYmJaBRWBrQcfVcMMaIIyqgHrsx3eyw/Y+MyzU s7DSDPwN0pmD7in7tqK3OHW21hq1TU7bfZfLtHlwPp5Bp2Jf5UW2kWLjMlCDtfqXFVeK E4Urm6W7edlmoocNQQZy46MGBIyKPUk6MnoZFi3aY4XGBgyveU6qrmvjwOYd9kX4njcZ Lw== Received: from beta.dmz-ap.st.com (beta.dmz-ap.st.com [138.198.100.35]) by mx08-00178001.pphosted.com with ESMTP id 2upeajrkg1-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT) for ; Thu, 29 Aug 2019 15:57:45 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-ap.st.com (STMicroelectronics) with ESMTP id C87A953 for ; Thu, 29 Aug 2019 13:57:41 +0000 (GMT) Received: from Webmail-eu.st.com (sfhdag5node1.st.com [10.75.127.13]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id ECF302CE4E1 for ; Thu, 29 Aug 2019 15:57:40 +0200 (CEST) Received: from [10.129.178.138] (10.75.127.48) by SFHDAG5NODE1.st.com (10.75.127.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Thu, 29 Aug 2019 15:57:40 +0200 Subject: Re: [ARM/FDPIC v5 00/21] FDPIC ABI for ARM To: References: <20190515124006.25840-1-christophe.lyon@st.com> From: Christophe Lyon Message-ID: <411229b9-7b7a-48d0-9a22-5b4095ea3714@st.com> Date: Thu, 29 Aug 2019 14:54:00 -0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190515124006.25840-1-christophe.lyon@st.com> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Transfer-Encoding: 7bit X-IsSubscribed: yes X-SW-Source: 2019-08/txt/msg01974.txt.bz2 Hi, 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? > I have addressed the comments I received on v5, and I am going to post updated versions of the patches that needed changes as follow-ups in this thread. I hope this will help reviewers as I will provide answers and updated patches next to their comments. After that, I will rebase the whole series and send it as v6 if that helps (several testsuite patches have already been approved as-is, but committing them now would change the patch numbering, thus possibly confusing reviewers). However, note that several patches in the series haven't received feedback yet, so this is a ping for them :-) [ARM/FDPIC v5 06/21] [ARM] FDPIC: Add support for c++ exceptions [ARM/FDPIC v5 10/21] [ARM] FDPIC: Implement TLS support. [ARM/FDPIC v5 11/21] [ARM] FDPIC: Add support to unwind FDPIC signal frame [ARM/FDPIC v5 12/21] [ARM] FDPIC: Restore r9 after we call __aeabi_read_tp [ARM/FDPIC v5 13/21] [ARM] FDPIC: Force LSB bit for PC in Cortex-M architecture Thanks, Christophe > 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 >