From patchwork Sat Jul 8 15:32:09 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhangjin Wu X-Patchwork-Id: 700692 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 ABA96EB64DA for ; Sat, 8 Jul 2023 15:32:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229729AbjGHPcW (ORCPT ); Sat, 8 Jul 2023 11:32:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60994 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229552AbjGHPcV (ORCPT ); Sat, 8 Jul 2023 11:32:21 -0400 Received: from bg4.exmail.qq.com (bg4.exmail.qq.com [43.154.54.12]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1167E183; Sat, 8 Jul 2023 08:32:19 -0700 (PDT) X-QQ-mid: bizesmtp80t1688830330tnbi25mx Received: from linux-lab-host.localdomain ( [116.30.131.119]) by bizesmtp.qq.com (ESMTP) with id ; Sat, 08 Jul 2023 23:32:09 +0800 (CST) X-QQ-SSF: 01200000000000D0W000000A0000000 X-QQ-FEAT: SFhf6fKhx/9392JZYlaBcqX7N+KA6AjdqY1MUs2G5hwRQSRVRqVb4QisWKQCO HfhGqBYbrXmkVF/kYZsdUHeGXXQhKWidRRUaqBB1u8jAKIlSClrHsv3QmEPoBm6bTCau/uE YJSj4Dac4bu8YDSDODE2VmpPIgcaXvEpHZyVWD6j84onxlxz/KhIWyGwJZtvoMZrXMxa79+ n9FTpbOp45V7syHlg8/MdkC8BXeTYttJduk3gdqrOClUB8tDBeiKf5AdYlxPQe21Z2e1mRk mz2DU8cSRnzoDThE4vWcjevDWjg3AiClpBwUr/z2DevYJrfDGc9ceFyjA/0pCyiL0X2k9cl yMqtgMU65tz8L4kJ7mJOXSKE5Naiz1UsNYY3DtFBW0gTxMX35najJkiiICOYw== X-QQ-GoodBg: 0 X-BIZMAIL-ID: 9503456289267630914 From: Zhangjin Wu To: w@1wt.eu Cc: falcon@tinylab.org, arnd@arndb.de, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, thomas@t-8ch.de Subject: [PATCH v2 06/12] tools/nolibc: aarch64/crt.h: shrink _start with _start_c Date: Sat, 8 Jul 2023 23:32:09 +0800 Message-Id: <45f8e3a6bef02996cdd97b672b3e350a9a90b626.1688828139.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 move most of the _start operations to _start_c(). Signed-off-by: Zhangjin Wu --- tools/include/nolibc/aarch64/crt.h | 23 +++++------------------ 1 file changed, 5 insertions(+), 18 deletions(-) diff --git a/tools/include/nolibc/aarch64/crt.h b/tools/include/nolibc/aarch64/crt.h index 6c81d81cf31f..4e04c421ab63 100644 --- a/tools/include/nolibc/aarch64/crt.h +++ b/tools/include/nolibc/aarch64/crt.h @@ -12,26 +12,13 @@ void __attribute__((weak, noreturn, optimize("omit-frame-pointer"))) __no_stack_ { __asm__ volatile ( #ifdef _NOLIBC_STACKPROTECTOR - "bl __stack_chk_init\n" /* initialize stack protector */ + "bl __stack_chk_init\n" /* initialize stack protector */ #endif - "ldr x0, [sp]\n" /* argc (x0) was in the stack */ - "add x1, sp, 8\n" /* argv (x1) = sp */ - "lsl x2, x0, 3\n" /* envp (x2) = 8*argc ... */ - "add x2, x2, 8\n" /* + 8 (skip null) */ - "add x2, x2, x1\n" /* + argv */ - "adrp x3, environ\n" /* x3 = &environ (high bits) */ - "str x2, [x3, #:lo12:environ]\n" /* store envp into environ */ - "mov x4, x2\n" /* search for auxv (follows NULL after last env) */ - "0:\n" - "ldr x5, [x4], 8\n" /* x5 = *x4; x4 += 8 */ - "cbnz x5, 0b\n" /* and stop at NULL after last env */ - "adrp x3, _auxv\n" /* x3 = &_auxv (high bits) */ - "str x4, [x3, #:lo12:_auxv]\n" /* store x4 into _auxv */ - "and sp, x1, -16\n" /* sp must be 16-byte aligned in the callee */ - "bl main\n" /* main() returns the status code, we'll exit with it. */ - "mov x8, 93\n" /* NR_exit == 93 */ - "svc #0\n" + "mov x0, sp\n" /* save stack pointer to x0, as arg1 of _start_c */ + "and sp, x0, -16\n" /* sp must be 16-byte aligned in the callee */ + "bl _start_c\n" /* transfer to c runtime */ ); __builtin_unreachable(); + } #endif /* _NOLIBC_AARCH64_CRT_H */