From mboxrd@z Thu Jan 1 00:00:00 1970 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A7F5AECAAD3 for ; Sat, 17 Sep 2022 07:49:14 +0000 (UTC) Received: from localhost ([::1]:33874 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oZSZd-0003Jt-KH for qemu-devel@archiver.kernel.org; Sat, 17 Sep 2022 03:49:13 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:47546) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oZSVR-0000Sn-3x for qemu-devel@nongnu.org; Sat, 17 Sep 2022 03:44:53 -0400 Received: from mail.loongson.cn ([114.242.206.163]:56086 helo=loongson.cn) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oZSVK-0006Hi-5h for qemu-devel@nongnu.org; Sat, 17 Sep 2022 03:44:52 -0400 Received: from localhost.localdomain (unknown [10.2.5.185]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Cx72uVeiVjfgQcAA--.38083S3; Sat, 17 Sep 2022 15:43:18 +0800 (CST) From: Song Gao To: qemu-devel@nongnu.org Cc: richard.henderson@linaro.org, peter.maydell@linaro.org, alex.bennee@linaro.org, maobibo@loongson.cn Subject: [RISU PATCH 1/5] risu: Use alternate stack Date: Sat, 17 Sep 2022 15:43:13 +0800 Message-Id: <20220917074317.1410274-2-gaosong@loongson.cn> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220917074317.1410274-1-gaosong@loongson.cn> References: <20220917074317.1410274-1-gaosong@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID: AQAAf8Cx72uVeiVjfgQcAA--.38083S3 X-Coremail-Antispam: 1UD129KBjvJXoW7AryUWw45JryDWw1xCw17ZFb_yoW8JF43pw 43Ca4ftrZ8JrW2q39xCrWkW39xJwn7AryUuF43u3yUXayDGr9Yv3Z8GFy3uFyxGFs8A3yD ArZYka15uF4DCrJanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnUUvcSsGvfC2KfnxnUUI43ZEXa7xR_UUUUUUUUU== X-CM-SenderInfo: 5jdr20tqj6z05rqj20fqof0/ Received-SPF: pass client-ip=114.242.206.163; envelope-from=gaosong@loongson.cn; helo=loongson.cn X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" We can use alternate stack, so that we can use sp register as intput/ouput register. I had tested aarch64/LoongArch architecture. Signed-off-by: Song Gao --- risu.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/risu.c b/risu.c index 1c096a8..714074e 100644 --- a/risu.c +++ b/risu.c @@ -329,7 +329,7 @@ static void set_sigill_handler(void (*fn) (int, siginfo_t *, void *)) memset(&sa, 0, sizeof(struct sigaction)); sa.sa_sigaction = fn; - sa.sa_flags = SA_SIGINFO; + sa.sa_flags = SA_SIGINFO | SA_ONSTACK; sigemptyset(&sa.sa_mask); if (sigaction(SIGILL, &sa, 0) != 0) { perror("sigaction"); @@ -550,6 +550,7 @@ int main(int argc, char **argv) char *trace_fn = NULL; struct option *longopts; char *shortopts; + stack_t ss; longopts = setup_options(&shortopts); @@ -617,6 +618,19 @@ int main(int argc, char **argv) load_image(imgfile); + /* create alternate stack */ + ss.ss_sp = malloc(SIGSTKSZ); + if (ss.ss_sp == NULL) { + perror("malloc"); + exit(EXIT_FAILURE); + } + ss.ss_size = SIGSTKSZ; + ss.ss_flags = 0; + if (sigaltstack(&ss, NULL) == -1) { + perror("sigaltstac"); + exit(EXIT_FAILURE); + } + /* E.g. select requested SVE vector length. */ arch_init(); -- 2.31.1