From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp-out2.suse.de (smtp-out2.suse.de [IPv6:2001:67c:2178:6::1d]) by sourceware.org (Postfix) with ESMTPS id 08FA73858C20 for ; Thu, 23 Mar 2023 13:12:02 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 08FA73858C20 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=suse.de Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=suse.de Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out2.suse.de (Postfix) with ESMTP id 396EA1FDD4; Thu, 23 Mar 2023 13:12:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1679577121; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=AkgapT9IJM7h+3XkmjlaizipRgN4Lf97F2mKG7x9vSc=; b=nmio/zyxBf3OMKx6BjGB99guDQ9kco34Amo46d2ZsWqs6UnGQ4ZBCPLCIm8bqTEqGjbPRl IsEigxHOiaEGUEZKEJ/4lLs/h3vDk7BYCpvjuIgypJHlE1PXuVg0oC3fpjSoOKxsQoTJ36 PyTUHg/AfJQcRDcpgCKg8hDppyzNPYM= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1679577121; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=AkgapT9IJM7h+3XkmjlaizipRgN4Lf97F2mKG7x9vSc=; b=pFJjcBJO+kh/2wlA0n8fzOZg7t0+MT/RLgQJxLBw9A0f6aKZ2OK2/RNusfeqkXy4+WigFh zaZs2MFGC7ABgeAQ== Received: from hawking.suse.de (unknown [10.168.4.11]) by relay2.suse.de (Postfix) with ESMTP id E12A52C141; Thu, 23 Mar 2023 13:12:00 +0000 (UTC) Received: by hawking.suse.de (Postfix, from userid 17005) id CDBAA4A0358; Thu, 23 Mar 2023 14:12:00 +0100 (CET) From: Andreas Schwab To: caiyinyu Cc: Xi Ruoyao , libc-alpha@sourceware.org, adhemerval.zanella@linaro.org Subject: Re: [PATCH] LoongArch: Add Syscall Assembly Implementation References: <20230323084013.1100656-1-caiyinyu@loongson.cn> <8a4e2e72-9daf-d264-f49d-719daa2407b5@loongson.cn> X-Yow: .. Once upon a time, four AMPHIBIOUS HOG CALLERS attacked a family of DEFENSELESS, SENSITIVE COIN COLLECTORS and brought DOWN their PROPERTY VALUES!! Date: Thu, 23 Mar 2023 14:12:00 +0100 In-Reply-To: <8a4e2e72-9daf-d264-f49d-719daa2407b5@loongson.cn> (caiyinyu@loongson.cn's message of "Thu, 23 Mar 2023 20:01:18 +0800") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-1.6 required=5.0 tests=BAYES_00,BODY_8BITS,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On Mär 23 2023, caiyinyu wrote: > Without this patch(objdump -d libc.so...): > > 00000000000dd45c : >    dd45c:       02fec063        addi.d          $sp, $sp, -80(0xfb0) >    dd460:       02c0606c        addi.d          $t0, $sp, 24(0x18) >    dd464:       29c06065        st.d            $a1, $sp, 24(0x18) >    dd468:       29c08066        st.d            $a2, $sp, 32(0x20) >    dd46c:       29c0a067        st.d            $a3, $sp, 40(0x28) >    dd470:       29c0c068        st.d            $a4, $sp, 48(0x30) >    dd474:       29c0e069        st.d            $a5, $sp, 56(0x38) >    dd478:       29c1206b        st.d            $a7, $sp, 72(0x48) >    dd47c:       29c1006a        st.d            $a6, $sp, 64(0x40) If the argument registers are call-clobbbered, why does the compiler need to save them? -- Andreas Schwab, SUSE Labs, schwab@suse.de GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7 "And now for something completely different."