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Thu, 2 Mar 2023 16:12:07 +0000 (UTC) X-SNPS-Relay: synopsys.com From: Pavel.Kozlov@synopsys.com To: libc-alpha@sourceware.org Cc: linux-snps-arc@lists.infradead.org, Pavel Kozlov Subject: [PATCH 1/2] ARC: Add the clone3 wrapper Date: Thu, 2 Mar 2023 20:10:18 +0400 Message-Id: <20230302161019.27192-1-kozlov@synopsys.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Proofpoint-GUID: MUDGHryKDFWlja64VYxhY7_gXthZk4de X-Proofpoint-ORIG-GUID: MUDGHryKDFWlja64VYxhY7_gXthZk4de X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-03-02_09,2023-03-02_02,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_active_cloned_notspam policy=outbound_active_cloned score=0 phishscore=0 impostorscore=0 mlxscore=0 lowpriorityscore=0 mlxlogscore=999 clxscore=1015 spamscore=0 suspectscore=0 priorityscore=1501 bulkscore=0 malwarescore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2303020140 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230302_081215_101734_D5FF8728 X-CRM114-Status: GOOD ( 23.72 ) X-BeenThere: linux-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+linux-snps-arc=archiver.kernel.org@lists.infradead.org From: Pavel Kozlov Use the clone3 wrapper on ARC. It doesn't care about stack alignment. All callers should provide an aligned stack. It follows the internal signature: extern int clone3 (struct clone_args *__cl_args, size_t __size, int (*__func) (void *__arg), void *__arg); --- Checked on arc-linux-gnu. Previously observed tst-misaling-clone-internal test fail was because I used outdated master branch. Full testsuite runs without regressions. But I also see fail of the new tst-spawn7, as already repoted at [1]. [1] https://sourceware.org/pipermail/libc-alpha/2023-February/145937.html sysdeps/unix/sysv/linux/arc/clone3.S | 90 ++++++++++++++++++++++++++++ sysdeps/unix/sysv/linux/arc/sysdep.h | 2 + 2 files changed, 92 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/arc/clone3.S diff --git a/sysdeps/unix/sysv/linux/arc/clone3.S b/sysdeps/unix/sysv/linux/arc/clone3.S new file mode 100644 index 000000000000..87a8272a3977 --- /dev/null +++ b/sysdeps/unix/sysv/linux/arc/clone3.S @@ -0,0 +1,90 @@ +/* The clone3 syscall wrapper. Linux/arc version. + Copyright (C) 2023 Free Software Foundation, Inc. + + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#define _ERRNO_H 1 +#include + +/* The userland implementation is: + int clone3 (struct clone_args *cl_args, size_t size, + int (*func)(void *arg), void *arg); + + the kernel entry is: + int clone3 (struct clone_args *cl_args, size_t size); + + The parameters are passed in registers from userland: + r0: cl_args + r1: size + r2: func + r3: arg */ + +ENTRY(__clone3) + + /* Save args for the child. */ + mov r10, r0 /* cl_args */ + mov r11, r2 /* func */ + mov r12, r3 /* args */ + + /* Sanity check args. */ + breq r10, 0, L (__sys_err) /* No NULL cl_args pointer. */ + breq r11, 0, L (__sys_err) /* No NULL function pointer. */ + + /* Do the system call, the kernel expects: + r8: system call number + r0: cl_args + r1: size */ + mov r0, r10 + mov r8, __NR_clone3 + ARC_TRAP_INSN + + cmp r0, 0 + beq thread_start_clone3 /* Child returns. */ + blt L (__sys_err2) + j [blink] /* Parent returns. */ + +L (__sys_err): + mov r0, -EINVAL +L (__sys_err2): + b __syscall_error +PSEUDO_END (__clone3) + + + .align 4 + .type thread_start_clone3, %function +thread_start_clone3: + cfi_startproc + /* Terminate call stack by noting ra is undefined. */ + cfi_undefined (blink) + + /* Child jumps off to @fn with @arg as argument. */ + jl.d [r11] + mov r0, r12 + + /* exit() with result from @fn (already in r0). */ + mov r8, __NR_exit + ARC_TRAP_INSN + + /* In case it ever came back. */ + flag 1 + + cfi_endproc + .size thread_start_clone3, .-thread_start_clone3 + +libc_hidden_def (__clone3) +weak_alias (__clone3, clone3) diff --git a/sysdeps/unix/sysv/linux/arc/sysdep.h b/sysdeps/unix/sysv/linux/arc/sysdep.h index dd6fe73445f9..88dc1dff017f 100644 --- a/sysdeps/unix/sysv/linux/arc/sysdep.h +++ b/sysdeps/unix/sysv/linux/arc/sysdep.h @@ -141,6 +141,8 @@ hidden_proto (__syscall_error) # define ARC_TRAP_INSN "trap_s 0 \n\t" +# define HAVE_CLONE3_WRAPPER 1 + # undef INTERNAL_SYSCALL_NCS # define INTERNAL_SYSCALL_NCS(number, nr_args, args...) \ ({ \ -- 2.25.1 _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc