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Thu, 2 Mar 2023 16:12:16 +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 2/2] ARC: run child from the separate start block in __clone Date: Thu, 2 Mar 2023 20:10:19 +0400 Message-Id: <20230302161019.27192-2-kozlov@synopsys.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230302161019.27192-1-kozlov@synopsys.com> References: <20230302161019.27192-1-kozlov@synopsys.com> MIME-Version: 1.0 X-Proofpoint-GUID: YlCzq_bxQPRvZ3PwhbDVJxRjvxzMUMw8 X-Proofpoint-ORIG-GUID: YlCzq_bxQPRvZ3PwhbDVJxRjvxzMUMw8 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 lowpriorityscore=0 phishscore=0 suspectscore=0 priorityscore=1501 mlxscore=0 clxscore=1015 malwarescore=0 adultscore=0 mlxlogscore=944 impostorscore=0 bulkscore=0 spamscore=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_081220_721412_046796FF X-CRM114-Status: GOOD ( 15.92 ) 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 For better debug experience use separate code block with extra cfi_* directives to run child (same as in __clone3). --- sysdeps/unix/sysv/linux/arc/clone.S | 40 ++++++++++++++++++----------- 1 file changed, 25 insertions(+), 15 deletions(-) diff --git a/sysdeps/unix/sysv/linux/arc/clone.S b/sysdeps/unix/sysv/linux/arc/clone.S index 766649625658..0029aaeb8170 100644 --- a/sysdeps/unix/sysv/linux/arc/clone.S +++ b/sysdeps/unix/sysv/linux/arc/clone.S @@ -20,9 +20,6 @@ #include #define _ERRNO_H 1 #include -#include - -#define CLONE_SETTLS 0x00080000 /* int clone(int (*fn)(void *), void *child_stack, int flags, void *arg, ... @@ -63,19 +60,9 @@ ENTRY (__clone) ARC_TRAP_INSN cmp r0, 0 /* return code : 0 new process, !0 parent. */ + beq thread_start_clone blt L (__sys_err2) /* < 0 (signed) error. */ - jnz [blink] /* Parent returns. */ - - /* child jumps off to @fn with @arg as argument - TP register already set by kernel. */ - jl.d [r10] - mov r0, r11 - - /* exit() with result from @fn (already in r0). */ - mov r8, __NR_exit - ARC_TRAP_INSN - /* In case it ever came back. */ - flag 1 + j [blink] /* Parent returns. */ L (__sys_err): mov r0, -EINVAL @@ -89,5 +76,28 @@ L (__sys_err2): position independent. */ b __syscall_error PSEUDO_END (__clone) + + + .align 4 + .type thread_start_clone, %function +thread_start_clone: + cfi_startproc + /* Terminate call stack by noting ra is undefined. */ + cfi_undefined (blink) + + /* Child jumps off to @fn with @arg as argument. */ + jl.d [r10] + mov r0, r11 + + /* 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_clone, .-thread_start_clone + libc_hidden_def (__clone) weak_alias (__clone, clone) -- 2.25.1 _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc