From patchwork Fri Jul 7 14:55:35 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhangjin Wu X-Patchwork-Id: 700277 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 87835EB64D9 for ; Fri, 7 Jul 2023 14:56:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233153AbjGGO4U (ORCPT ); Fri, 7 Jul 2023 10:56:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40572 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233151AbjGGO4T (ORCPT ); Fri, 7 Jul 2023 10:56:19 -0400 Received: from bg4.exmail.qq.com (bg4.exmail.qq.com [43.154.54.12]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BAD4A2117; Fri, 7 Jul 2023 07:56:10 -0700 (PDT) X-QQ-mid: bizesmtp90t1688741756t4957kso Received: from linux-lab-host.localdomain ( [116.30.131.119]) by bizesmtp.qq.com (ESMTP) with id ; Fri, 07 Jul 2023 22:55:54 +0800 (CST) X-QQ-SSF: 01200000000000D0W000000A0000000 X-QQ-FEAT: ILHsT53NKPgT3vYb7mSqef6qq6ijJFi5yZN+5IyXvKcCNY/FIjIcEWS0O5O+d 2NGhVscVoSruYGQXUG1TyM4Xedj+I/qg+7nL+jSkOz5tn0vd+07XiMUqFJslNu8QBkHhpUT 0MtEI2n1qoAZP64wEYuleIEOyFT9uh9c1HTh0aSVkydPB8MzgzUkyVLD2FoKPyNMJTecK1R y8/UG3/PQNvw4I5GSsIMvazUH7UcFyNyWD0VmHh9aKiUcZ9t5PFVjbGpo/bLKCzqHxq2NMY u8rgA6n/NSDFQIjFKpQAFBV4nNGLkxZd3pehjtNaIJ27EX2lHZEqBpdXgouPeQOc2OYwhVe 2zZjcdcsqh/BgXe/5Va1Z/B03oHnY72gBId+uoUZIAuyabDfddtVo0xRQgnKg== X-QQ-GoodBg: 0 X-BIZMAIL-ID: 8772950966564420236 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 05/15] tools/nolibc: add missing my_syscall6() for mips Date: Fri, 7 Jul 2023 22:55:35 +0800 Message-Id: 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 It is able to pass the 6th argument like the 5th argument via the stack for mips, let's add a new my_syscall6() now, see [1] for details: The mips/o32 system call convention passes arguments 5 through 8 on the user stack. Both mmap() and pselect6() require my_syscall6(). [1]: https://man7.org/linux/man-pages/man2/syscall.2.html Signed-off-by: Zhangjin Wu --- tools/include/nolibc/arch-mips.h | 27 ++++++++++++++++++++++++++- tools/include/nolibc/nolibc.h | 9 ++++----- 2 files changed, 30 insertions(+), 6 deletions(-) diff --git a/tools/include/nolibc/arch-mips.h b/tools/include/nolibc/arch-mips.h index 1848f57777c4..a2bfdf57b957 100644 --- a/tools/include/nolibc/arch-mips.h +++ b/tools/include/nolibc/arch-mips.h @@ -166,7 +166,7 @@ struct sys_stat_struct { __asm__ volatile ( \ "addiu $sp, $sp, -32\n" \ "sw %7, 16($sp)\n" \ - "syscall\n " \ + "syscall\n" \ "addiu $sp, $sp, 32\n" \ : "=r" (_num), "=r"(_arg4) \ : "0"(_num), \ @@ -176,6 +176,31 @@ struct sys_stat_struct { _arg4 ? -_num : _num; \ }) +#define my_syscall6(num, arg1, arg2, arg3, arg4, arg5, arg6) \ +({ \ + register long _num __asm__ ("v0") = (num); \ + register long _arg1 __asm__ ("a0") = (long)(arg1); \ + register long _arg2 __asm__ ("a1") = (long)(arg2); \ + register long _arg3 __asm__ ("a2") = (long)(arg3); \ + register long _arg4 __asm__ ("a3") = (long)(arg4); \ + register long _arg5 = (long)(arg5); \ + register long _arg6 = (long)(arg6); \ + \ + __asm__ volatile ( \ + "addiu $sp, $sp, -32\n" \ + "sw %7, 16($sp)\n" \ + "sw %8, 20($sp)\n" \ + "syscall\n" \ + "addiu $sp, $sp, 32\n" \ + : "=r" (_num), "=r"(_arg4) \ + : "0"(_num), \ + "r"(_arg1), "r"(_arg2), "r"(_arg3), "r"(_arg4), "r"(_arg5), \ + "r"(_arg6) \ + : _NOLIBC_SYSCALL_CLOBBERLIST \ + ); \ + _arg4 ? -_num : _num; \ +}) + char **environ __attribute__((weak)); const unsigned long *_auxv __attribute__((weak)); diff --git a/tools/include/nolibc/nolibc.h b/tools/include/nolibc/nolibc.h index 05a228a6ee78..1f8d821000ac 100644 --- a/tools/include/nolibc/nolibc.h +++ b/tools/include/nolibc/nolibc.h @@ -13,11 +13,10 @@ * Syscalls are split into 3 levels: * - The lower level is the arch-specific syscall() definition, consisting in * assembly code in compound expressions. These are called my_syscall0() to - * my_syscall6() depending on the number of arguments. The MIPS - * implementation is limited to 5 arguments. All input arguments are cast - * to a long stored in a register. These expressions always return the - * syscall's return value as a signed long value which is often either a - * pointer or the negated errno value. + * my_syscall6() depending on the number of arguments. All input arguments + * are castto a long stored in a register. These expressions always return + * the syscall's return value as a signed long value which is often either + * a pointer or the negated errno value. * * - The second level is mostly architecture-independent. It is made of * static functions called sys_() which rely on my_syscallN()