From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from xry111.site (xry111.site [IPv6:2001:470:683e::1]) by sourceware.org (Postfix) with ESMTPS id 1A4B9384F01A for ; Sat, 25 Mar 2023 14:08:53 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 1A4B9384F01A Authentication-Results: sourceware.org; dmarc=pass (p=reject dis=none) header.from=xry111.site Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=xry111.site DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=xry111.site; s=default; t=1679753331; bh=W3gm8rk65GEZrdx+Hio9gUGiWeGSIhkpi/y/vKKZJCQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VG0f8VfVE587TjjjxEZruSy5oAA0udVgsUNyMFrKEtj/276py+fEJt6yxoVltqxlI wlETNaPC73CxGAPrPDSYgKtT4lFSaeZQlc77XlwxtzaD2aZQ0oP4BwRrsZYrjJ9iEX t83A39RThEVyfd2NmU5ki7OF2shBsL1ZvevuFQcI= Received: from stargazer.. (unknown [IPv6:240e:358:1172:ca00:dc73:854d:832e:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384) server-digest SHA384) (Client did not present a certificate) (Authenticated sender: xry111@xry111.site) by xry111.site (Postfix) with ESMTPSA id AE2136647A; Sat, 25 Mar 2023 10:08:46 -0400 (EDT) From: Xi Ruoyao To: libc-alpha@sourceware.org Cc: caiyinyu , Wang Xuerui , Adhemerval Zanella Netto , Andreas Schwab , Florian Weimer , Xi Ruoyao Subject: [PATCH v2 3/5] LoongArch: Define __ASSUME_SYSCALL_NAMED_WORKS for Linux Date: Sat, 25 Mar 2023 22:08:13 +0800 Message-Id: <20230325140815.4170296-4-xry111@xry111.site> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230325140815.4170296-1-xry111@xry111.site> References: <20230325140815.4170296-1-xry111@xry111.site> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-8.5 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,KAM_SHORT,LIKELY_SPAM_FROM,SPF_HELO_PASS,SPF_PASS,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: LoongArch calling convention treats the non-floating-point variable arguments same as named ones, and when each argument is an integer not wider than long or a pointer, the ith argument is in register $ai (0 <= i < 8) or the stack slot at ($sp + sizeof(long) * (i - 8)) (i >= 8) no matter how many arguments are passed. So we can define __ASSUME_SYSCALL_NAMED_WORKS to avoid unnecessary stack stores in the syscall wrappers caused by va_start. --- .../sysv/linux/loongarch/kernel-features.h | 29 +++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/loongarch/kernel-features.h diff --git a/sysdeps/unix/sysv/linux/loongarch/kernel-features.h b/sysdeps/unix/sysv/linux/loongarch/kernel-features.h new file mode 100644 index 0000000000..f862d0623f --- /dev/null +++ b/sysdeps/unix/sysv/linux/loongarch/kernel-features.h @@ -0,0 +1,29 @@ +/* Set flags signalling availability of kernel features based on given + kernel version number. + 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_next + +/* Define this if the calling convention for passing x named arguments and y + variable arguments is same as passing (x + y) named arguments, while each + argument is either an integer of which the width is less than or equal to + "long", or a pointer; and an argument can be fetched from the same register + or the same offset from the stack pointer no matter how many (maybe zero) + arguments are passed after it. It avoids useless stack stores caused by + usage of va_start. */ +#define __ASSUME_SYSCALL_NAMED_WORKS 1 -- 2.40.0