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 picard.linux.it (picard.linux.it [213.254.12.146]) (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 A85B9C32771 for ; Fri, 19 Aug 2022 21:32:11 +0000 (UTC) Received: from picard.linux.it (localhost [IPv6:::1]) by picard.linux.it (Postfix) with ESMTP id A5E453CA247 for ; Fri, 19 Aug 2022 23:32:08 +0200 (CEST) Received: from in-3.smtp.seeweb.it (in-3.smtp.seeweb.it [217.194.8.3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384)) (No client certificate requested) by picard.linux.it (Postfix) with ESMTPS id 51D113C88EB for ; Fri, 19 Aug 2022 23:31:59 +0200 (CEST) Received: from mail-yw1-x114a.google.com (mail-yw1-x114a.google.com [IPv6:2607:f8b0:4864:20::114a]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by in-3.smtp.seeweb.it (Postfix) with ESMTPS id D1ADC1A00099 for ; Fri, 19 Aug 2022 23:31:58 +0200 (CEST) Received: by mail-yw1-x114a.google.com with SMTP id 00721157ae682-3360c0f0583so95765227b3.2 for ; Fri, 19 Aug 2022 14:31:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:mime-version:message-id:date:from:to:cc; bh=qIVVOqLKP+4STWaNOKzfOvhUaS89cnCskFF5wp8EmDY=; b=pnFNJ7pxqKJm1V24glJE3OON2uBfQnevU2pOG5Uiv3zeI5Trr7AtuLeLDaOYzt9YWR pNhj+I2XTpvxO15sy8wX3fNr7XDaxyrOk6nLHiTD2r+dtITmpBR85dcHrKYtDo1HZhdY 2dm+qEva7aCa4EXIuXIh2sU30al8fZK/TQ5ZPhvK0N+BANj83/gwAR+JwsyLNr4Eb4/I bezT+bvaqz7jTew7G+4U+BT6sHUtIXUC46KeM7alV6RqXmZ2zTEAdqQKG+mpGoh393Ed domV+bEvWXwvCAHIuAHmBRcxuCiuOzwPd+WUpmG8KuvyZO+m0O84CC2gHLXXSg+j0tU4 gnTQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:mime-version:message-id:date:x-gm-message-state :from:to:cc; bh=qIVVOqLKP+4STWaNOKzfOvhUaS89cnCskFF5wp8EmDY=; b=t1iSgQ7+fjSuUOZ482O2EKwsUPRptNd2lkS9kO1RjA5xCB/juhMZwkQJKocUlj9Og1 y221+sIIlyXhPbyN7XLuJqRCpyAPY5+LSLoRVhg/KOsQKxLNA8uHYLBmsrbltqmsE+QJ z+jjfijQ/9Af6pORzw6RKJpxo2DEmGPVuvq1tyLGR8AzeMM3ckDXfvbXUhHe4RlIxnT8 9ClYMJT4COd1rISCNXorqP8zRXwRhEmeNX3pOacToZSTaL+OPKPuH+y/jmXEcOJmqc4W kGucIV8C+r5TmEs3+qF7XrQhykzmjAuVACz0jG3fG3xkNvh9Y3KIUC1jalDcUmEHyNG8 Ltow== X-Gm-Message-State: ACgBeo2T4rlgNX5BuRVhMIu5V2O2kGGhKVk/pGND/ib8FkQb10dPgb6Y PG+uLaMKaEwyxYPteFk78OyKDlkiubySJGqwKZaKEr22EpIYZ+cu+Vcth5zx2eUN6WpdxCP55pQ 3Z2I8BvmRndi3vVJLHG3BzAtMYz46/j7FcyVL+Ib1+1V5yXp3il/QZuaZ X-Google-Smtp-Source: AA6agR5l4D/U4zHlJ6UBlNOXsFmOxa8j75qz7N0jUHD4HvtDbHohxLvfX6iRjNk/FqsKSJFJpjAy3Qa9yvc= X-Received: from edliaw.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:4be]) (user=edliaw job=sendgmr) by 2002:a25:cf4b:0:b0:68e:fea1:9fdc with SMTP id f72-20020a25cf4b000000b0068efea19fdcmr9548354ybg.643.1660944717464; Fri, 19 Aug 2022 14:31:57 -0700 (PDT) Date: Fri, 19 Aug 2022 21:31:48 +0000 Message-Id: <20220819213148.1995580-1-edliaw@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.37.2.609.g9ff673ca1a-goog To: ltp@lists.linux.it X-Virus-Scanned: clamav-milter 0.102.4 at in-3.smtp.seeweb.it X-Virus-Status: Clean Subject: [LTP] [PATCH v2] syscalls/signal06: loop being clobbered by syscall on clang X-BeenThere: ltp@lists.linux.it X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Test Project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Edward Liaw via ltp Reply-To: Edward Liaw Cc: kernel-team@android.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" Indicate to the compiler that the syscall will modify registers rcx and r11 to prevent loop from getting clobbered. Signed-off-by: Edward Liaw --- When I combined the asm instruction into one line, it threw an error that the "Asm-specifier for input or output variable conflicts with asm clobber list" for rax. I omitted it for now, but I'm not sure if that is correct. Also, is it ok to change the subject line like I did? --- testcases/kernel/syscalls/signal/signal06.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/testcases/kernel/syscalls/signal/signal06.c b/testcases/kernel/syscalls/signal/signal06.c index 64f886ee3..fba380610 100644 --- a/testcases/kernel/syscalls/signal/signal06.c +++ b/testcases/kernel/syscalls/signal/signal06.c @@ -72,8 +72,7 @@ void test(void) while (D == VALUE && loop < LOOPS) { /* sys_tkill(pid, SIGHUP); asm to avoid save/reload * fp regs around c call */ - asm ("" : : "a"(__NR_tkill), "D"(pid), "S"(SIGHUP)); - asm ("syscall" : : : "ax"); + asm volatile ("syscall" : : "a"(__NR_tkill), "D"(pid), "S"(SIGHUP) : "rcx", "r11"); loop++; } -- 2.37.2.609.g9ff673ca1a-goog -- Mailing list info: https://lists.linux.it/listinfo/ltp