From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on gnuweeb.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=ALL_TRUSTED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,NO_DNS_FOR_FROM,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.6 Received: from localhost.localdomain (unknown [182.253.88.132]) by gnuweeb.org (Postfix) with ESMTPSA id 35309819E8; Thu, 22 Dec 2022 03:52:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gnuweeb.org; s=default; t=1671681134; bh=ctfL3IPeMOTbGILYsO0YelFrNOG+80gl6emPmcMwO50=; h=From:To:Cc:Subject:Date:From; b=U2NQs+ViudUGNkX7v1zVqEra5R4HSo2oNFR3uNsgpPZ/5OZM0/fVe7KKT2cSegfTd BYmb+xqrGh9REoO0T68B3Q1hOBGMOj3lM65tNMn6ZND+jv6OANFttWzvrjwnOCZkvm jjGKFjhy0U2HQsBAtBmrHbVlbNk+ekxWBNa7p4LZGvYwaBYaol5FIKbUJ5I9IFIq5f FjG0MCI9elimDtWUrn4vtxM/wSwqCAnrGbBewuH5NJDutKbSZyJr/HM1qg0Weoeoyu KtLjK38aSdZ6tpgW/nYDBMNft6hVQfsDL4bNr7Jtf/bwj1bc8awD9Nne8c3SFvuoNN +4Bc/Keejc10g== From: Ammar Faizi To: Willy Tarreau , Shuah Khan , "Paul E. McKenney" Cc: Ammar Faizi , Gilang Fachrezy , VNLX Kernel Department , Alviro Iskandar Setiawan , Kanna Scarlet , Muhammad Rizki , GNU/Weeb Mailing List , Linux Kernel Mailing List , Linux Kselftest Mailing List Subject: [RFC PATCH v1 0/8] nolibc signal handling support Date: Thu, 22 Dec 2022 10:51:26 +0700 Message-Id: <20221222035134.3467659-1-ammar.faizi@intel.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit List-Id: From: Ammar Faizi Hi, This series adds signal handling support to the nolibc subsystem. 1) Initial implementation of nolibc sigaction(2) function. Currently, this implementation is only available on the x86-64 arch. sigaction() needs an architecture-dependent "signal trampoline" function that invokes the __rt_sigreturn syscall to resume the process after a signal gets handled. On Linux x86-64, the "signal trampoline" function has to be written in inline Assembly to prevent the compiler from controlling the %rsp (e.g., with -fno-omit-frame-pointer, every function has a pushq %rbp that makes the %rsp no longer point to struct rt_sigframe). The "signal trampoline" function is called __arch_restore_rt in this implementation. 2) signal(2) function. signal() function is the simpler version of sigaction(). Unlike sigaction(), which fully controls the struct sigaction, the caller only cares about the sa_handler when calling the signal() function. signal() internally calls sigaction(). This implementation is currently only available on the x86-64 arch. When the sigaction() function support is expanded to other architectures, this function will automatically support those architectures. It's basically just a sigaction() wrapper. 3) Extra nolibc updates. Apart from the signal handling support. This series also contains nolibc updates, they are: - getpagesize() support. - CFLAGS update. - fork(2) selftest. - sigaction(2) selftest. - signal(2) selftest. - getpagesize(2) selftest. There 8 patches in this series. It has been tested on Linux x86-64 arch and all tests OK. $ sudo ./nolibc-test Running test 'syscall' ... ... 66 wait_child = -1 ECHILD [OK] 67 waitpid_min = -1 ESRCH [OK] 68 waitpid_child = -1 ECHILD [OK] 69 write_badf = -1 EBADF [OK] 70 write_zero = 0 [OK] Errors during this test: 0 Running test 'stdlib' ... ... 14 memcmp_60_20 = 64 [OK] 15 memcmp_20_e0 = -192 [OK] 16 memcmp_e0_20 = 192 [OK] 17 memcmp_80_e0 = -96 [OK] 18 memcmp_e0_80 = 96 [OK] Errors during this test: 0 Total number of errors: 0 Exiting with status 0 $ make run -j8 Kernel: arch/x86/boot/bzImage is ready (#3) ... 82 test(s) passed. Signed-off-by: Ammar Faizi --- It's also available in the Git repository. The following changes since commit caf5c36025ec9395c8d7c78957b016a284812d23: srcu: Update comment after the index flip (2022-12-21 09:01:53 -0800) are available in the Git repository at: https://github.com/ammarfaizi2/linux-block testing/rfc.v1.2022-12-22.nolibc for you to fetch changes up to ac79aca684125907bfbefadfd6c6be0ccdfe8b33: selftests/nolibc: Add `getpagesize(2)` selftest (2022-12-22 09:57:31 +0700) ---------------------------------------------------------------- Ammar Faizi (8): nolibc/sys: Implement `sigaction(2)` function nolibc/sys: Implement `signal(2)` function nolibc/sys: Implement `getpagesize(2)` function selftests/nolibc: Add `-Wall` and `-Wno-unsed-function` to the CFLAGS selftests/nolibc: Add `fork(2)` selftest selftests/nolibc: Add `sigaction(2)` selftest selftests/nolibc: Add `signal(2)` selftest selftests/nolibc: Add `getpagesize(2)` selftest tools/include/nolibc/arch-x86_64.h | 12 + tools/include/nolibc/sys.h | 224 +++++++++++++++++++ tools/testing/selftests/nolibc/Makefile | 2 +- tools/testing/selftests/nolibc/nolibc-test.c | 219 +++++++++++++++++- 4 files changed, 454 insertions(+), 3 deletions(-) base-commit: caf5c36025ec9395c8d7c78957b016a284812d23 -- Ammar Faizi