From patchwork Fri Jul 7 14:58:20 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhangjin Wu X-Patchwork-Id: 13305004 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9B998EB64D9 for ; Fri, 7 Jul 2023 14:59:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233111AbjGGO7H (ORCPT ); Fri, 7 Jul 2023 10:59:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42148 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232308AbjGGO7G (ORCPT ); Fri, 7 Jul 2023 10:59:06 -0400 Received: from bg4.exmail.qq.com (bg4.exmail.qq.com [43.155.65.254]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B27E42102; Fri, 7 Jul 2023 07:59:03 -0700 (PDT) X-QQ-mid: bizesmtp66t1688741930t1u7j3pm Received: from linux-lab-host.localdomain ( [116.30.131.119]) by bizesmtp.qq.com (ESMTP) with id ; Fri, 07 Jul 2023 22:58:49 +0800 (CST) X-QQ-SSF: 01200000000000D0W000000A0000000 X-QQ-FEAT: FVl8EHhfVR7yQpfZTGK8C+9c2sldMS7g8O8sphi3aZ3lVOgDE6mUBVA4cCQad kO/IXo2DyBCrzayugYXvTg5txrwWjTP6N5r+UZweLv4IkFD30FHcdjIK1+jFUtIiMik2QUG HkOw6coYGLIO8BZwYXLEer8oY/wY2g/gx+OMutEGwfozZE01xyhidcc6kipNJivkA5mMy65 UnHb6lTgTTv4PYZwlBSpSFlUEZRRZUodLLdeG6EjdS+b7ZgBv7p0QsKptgKlaz4XVxN1lfe hqxBNYLi51fQB/4Dn+CFw55wcyWYxgLZI1J69Sfu59KNZ5n2roe4WNRY7A+Hh9E5VKKVYIX d8PyfxwRmSvJCcQjaXt45gwIFPDjpPhrRd5iCY9Cz3CJtT5N/Y1dOGPHqXeOgY+nAuBj+ds X-QQ-GoodBg: 0 X-BIZMAIL-ID: 12986911038597649536 From: Zhangjin Wu To: w@1wt.eu Cc: falcon@tinylab.org, arnd@arndb.de, david.laight@aculab.com, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-riscv@lists.infradead.org, thomas@t-8ch.de Subject: [PATCH v6 07/15] tools/nolibc: clean up mmap() routine Date: Fri, 7 Jul 2023 22:58:20 +0800 Message-Id: <5817aa30c97be3b4db794a1d35272e0f379b80f1.1688739492.git.falcon@tinylab.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 X-QQ-SENDSIZE: 520 Feedback-ID: bizesmtp:tinylab.org:qybglogicsvrgz:qybglogicsvrgz5a-1 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Do several cleanups together: - Since all supported architectures have my_syscall6() now, remove the #ifdef check. - Move the mmap() related macros to tools/include/nolibc/types.h and reuse most of them from - Apply the new generic __sysret() to convert the calling of sys_map() to oneline code Note, since MAP_FAILED is -1 on Linux, so we can use the generic __sysret() which returns -1 upon error and still satisfy user land that checks for MAP_FAILED. Suggested-by: Willy Tarreau Link: https://lore.kernel.org/lkml/20230702192347.GJ16233@1wt.eu/ Signed-off-by: Zhangjin Wu --- tools/include/nolibc/sys.h | 29 ++++++----------------------- tools/include/nolibc/types.h | 6 ++++++ 2 files changed, 12 insertions(+), 23 deletions(-) diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h index 3479f54d7957..3d01a24e6f7a 100644 --- a/tools/include/nolibc/sys.h +++ b/tools/include/nolibc/sys.h @@ -636,26 +636,11 @@ int mknod(const char *path, mode_t mode, dev_t dev) return __sysret(sys_mknod(path, mode, dev)); } -#ifndef MAP_SHARED -#define MAP_SHARED 0x01 /* Share changes */ -#define MAP_PRIVATE 0x02 /* Changes are private */ -#define MAP_SHARED_VALIDATE 0x03 /* share + validate extension flags */ -#endif - -#ifndef MAP_FAILED -#define MAP_FAILED ((void *)-1) -#endif - #ifndef sys_mmap static __attribute__((unused)) void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset) { -#ifndef my_syscall6 - /* Function not implemented. */ - return (void *)-ENOSYS; -#else - int n; #if defined(__NR_mmap2) @@ -666,20 +651,18 @@ void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd, #endif return (void *)my_syscall6(n, addr, length, prot, flags, fd, offset); -#endif } #endif +/* Note that on Linux, MAP_FAILED is -1 so we can use the generic __sysret() + * which returns -1 upon error and still satisfy user land that checks for + * MAP_FAILED. + */ + static __attribute__((unused)) void *mmap(void *addr, size_t length, int prot, int flags, int fd, off_t offset) { - void *ret = sys_mmap(addr, length, prot, flags, fd, offset); - - if ((unsigned long)ret >= -4095UL) { - SET_ERRNO(-(long)ret); - ret = MAP_FAILED; - } - return ret; + return (void *)__sysret((unsigned long)sys_mmap(addr, length, prot, flags, fd, offset)); } static __attribute__((unused)) diff --git a/tools/include/nolibc/types.h b/tools/include/nolibc/types.h index f96e28bff4ba..5e1bac8509ec 100644 --- a/tools/include/nolibc/types.h +++ b/tools/include/nolibc/types.h @@ -8,6 +8,7 @@ #define _NOLIBC_TYPES_H #include "std.h" +#include #include #include @@ -81,6 +82,11 @@ #define MAXPATHLEN (PATH_MAX) #endif +/* flags for mmap */ +#ifndef MAP_FAILED +#define MAP_FAILED ((void *)-1) +#endif + /* whence values for lseek() */ #define SEEK_SET 0 #define SEEK_CUR 1