From patchwork Wed Jul 12 09:25:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhangjin Wu X-Patchwork-Id: 13309907 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 E25D0EB64D9 for ; Wed, 12 Jul 2023 09:25:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232475AbjGLJZd (ORCPT ); Wed, 12 Jul 2023 05:25:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41960 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232263AbjGLJZ2 (ORCPT ); Wed, 12 Jul 2023 05:25:28 -0400 Received: from bg4.exmail.qq.com (bg4.exmail.qq.com [43.154.54.12]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6199E11D; Wed, 12 Jul 2023 02:25:27 -0700 (PDT) X-QQ-mid: bizesmtp88t1689153918teu0uwlk Received: from linux-lab-host.localdomain ( [116.30.126.249]) by bizesmtp.qq.com (ESMTP) with id ; Wed, 12 Jul 2023 17:25:16 +0800 (CST) X-QQ-SSF: 01200000000000D0W000000A0000000 X-QQ-FEAT: 239gR2IZrltKqPhg8ID3o5Pz4jyanvYhDcSzbwRy7HgWu927QkXaP4ef5OeRN qtA9Ik35h1ELNf5DWNXSj7UaPkRlJGClZXDclFLxWUvN7KYVyo83R+DOFY7E3AdM+TNayuy SaxbUW6yO0YCJcRelPEYJCsdW/6qQAEJCIgLIaG6+H7toJ8VV2DoHLkZKcG9NduG5oRIISv KcHn7LkesJ/IKzGbXcvQx3e2SJCFID2ajOR9LQOrwlLP3+LFuGka6gfsl8fE/wSaNB3kQuW 6F8sNOemZ2blYajmIvx7sSPXS8XShYwFwvHJbF14LQKNzJqisl7xnvJTpihGc/VfsVCkDxi kQQHgX4gJ/qH+IxomMFe677EKQIx7GjPvFkKvIF1HyBv1/q3lXej7b6FudZP7TvpdOVejS9 X-QQ-GoodBg: 0 X-BIZMAIL-ID: 86389509092924257 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 v3 09/11] tools/nolibc: riscv: shrink _start with _start_c Date: Wed, 12 Jul 2023 17:25:15 +0800 Message-Id: <29559df55935d61e7ca774bb36fa3c73e2011090.1689150149.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/arch-riscv.h | 43 +++++-------------------------- 1 file changed, 6 insertions(+), 37 deletions(-) diff --git a/tools/include/nolibc/arch-riscv.h b/tools/include/nolibc/arch-riscv.h index 2b89ea59c5e4..2e3fcf925ae9 100644 --- a/tools/include/nolibc/arch-riscv.h +++ b/tools/include/nolibc/arch-riscv.h @@ -8,18 +8,7 @@ #define _NOLIBC_ARCH_RISCV_H #include "compiler.h" - -#if __riscv_xlen == 64 -#define PTRLOG "3" -#define SZREG "8" -#define REG_L "ld" -#define REG_S "sd" -#elif __riscv_xlen == 32 -#define PTRLOG "2" -#define SZREG "4" -#define REG_L "lw" -#define REG_S "sw" -#endif +#include "crt.h" /* Syscalls for RISCV : * - stack is 16-byte aligned @@ -153,40 +142,20 @@ _arg1; \ }) -char **environ __attribute__((weak)); -const unsigned long *_auxv __attribute__((weak)); - /* startup code */ void __attribute__((weak,noreturn,optimize("omit-frame-pointer"))) __no_stack_protector _start(void) { __asm__ volatile ( ".option push\n" ".option norelax\n" - "lla gp, __global_pointer$\n" + "lla gp, __global_pointer$\n" ".option pop\n" #ifdef _NOLIBC_STACKPROTECTOR - "call __stack_chk_init\n" /* initialize stack protector */ + "call __stack_chk_init\n" /* initialize stack protector */ #endif - REG_L" a0, 0(sp)\n" /* argc (a0) was in the stack */ - "add a1, sp, "SZREG"\n" /* argv (a1) = sp */ - "slli a2, a0, "PTRLOG"\n" /* envp (a2) = SZREG*argc ... */ - "add a2, a2, "SZREG"\n" /* + SZREG (skip null) */ - "add a2,a2,a1\n" /* + argv */ - - "add a3, a2, zero\n" /* iterate a3 over envp to find auxv (after NULL) */ - "0:\n" /* do { */ - REG_L" a4, 0(a3)\n" /* a4 = *a3; */ - "add a3, a3, "SZREG"\n" /* a3 += sizeof(void*); */ - "bne a4, zero, 0b\n" /* } while (a4); */ - "lui a4, %hi(_auxv)\n" /* a4 = &_auxv (high bits) */ - REG_S" a3, %lo(_auxv)(a4)\n" /* store a3 into _auxv */ - - "lui a3, %hi(environ)\n" /* a3 = &environ (high bits) */ - REG_S" a2,%lo(environ)(a3)\n"/* store envp(a2) into environ */ - "andi sp,a1,-16\n" /* sp must be 16-byte aligned */ - "call main\n" /* main() returns the status code, we'll exit with it. */ - "li a7, 93\n" /* NR_exit == 93 */ - "ecall\n" + "mv a0, sp\n" /* save stack pointer to a0, as arg1 of _start_c */ + "andi sp, a0, -16\n" /* sp must be 16-byte aligned */ + "call _start_c\n" /* transfer to c runtime */ ); __builtin_unreachable(); }