From patchwork Wed Jun 28 13:37:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhangjin Wu X-Patchwork-Id: 697590 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 E42D3EB64D7 for ; Wed, 28 Jun 2023 13:39:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232225AbjF1Nj3 (ORCPT ); Wed, 28 Jun 2023 09:39:29 -0400 Received: from bg4.exmail.qq.com ([43.154.54.12]:56764 "EHLO bg4.exmail.qq.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232277AbjF1NjG (ORCPT ); Wed, 28 Jun 2023 09:39:06 -0400 X-QQ-mid: bizesmtp90t1687959532t6lkbz99 Received: from linux-lab-host.localdomain ( [116.30.129.193]) by bizesmtp.qq.com (ESMTP) with id ; Wed, 28 Jun 2023 21:38:51 +0800 (CST) X-QQ-SSF: 01200000000000D0V000000A0000000 X-QQ-FEAT: fs34Pe/+C2TAGmtvIl5731SN/JR7nW+oSFpCdSEQM3tivCtSYm/L9iQc51+aB fFcDYWodV80KzFgfamh05BQPEi0waHVAGyQiVMNLMa1rIAVmeVPDPtO7Eoe2crDK6Y+JrN7 YI2BR8ZJJ/OrR51LISkScVCLzQimPHH6lS1UQ6PmupxN36ALbS0Es94sQxIQkfTwXi/bZ71 vK2Mjm0lDlH4e+0ZZ3ziXmrJWYMQVaID7H7YfDo8CNV16ZgS7DK9agY9ko+mAfrnarNWXL9 R9JWH0xCpka5uVIONnzNQ34wSXwuYb4MuezRmTqiVP6tiU71EMPPW69JSS3Mj6qEewKrpnX y+FCe82Q5XKBHlcNHADgnFUfRDW1jBA+E7H0cWXQqKITa1lkmg2tV6dh8F3zw== X-QQ-GoodBg: 0 X-BIZMAIL-ID: 618334748572230207 From: Zhangjin Wu To: thomas@t-8ch.de, 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 Subject: [PATCH v5 09/14] tools/nolibc: add missing my_syscall6() for mips Date: Wed, 28 Jun 2023 21:37:29 +0800 Message-Id: <5089ddd75a7cb01486f664c025876c803fe26d5b.1687957589.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:qybglogicsvrsz:qybglogicsvrsz3a-3 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 | 25 +++++++++++++++++++++++++ tools/include/nolibc/nolibc.h | 9 ++++----- 2 files changed, 29 insertions(+), 5 deletions(-) diff --git a/tools/include/nolibc/arch-mips.h b/tools/include/nolibc/arch-mips.h index 55a9f01825e0..a8b33d6914a4 100644 --- a/tools/include/nolibc/arch-mips.h +++ b/tools/include/nolibc/arch-mips.h @@ -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) \ + : 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()