From nobody Wed Nov 5 09:02:11 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1499714675396802.6880620776036; Mon, 10 Jul 2017 12:24:35 -0700 (PDT) Received: from localhost ([::1]:42628 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dUeIL-00011R-KM for importer@patchew.org; Mon, 10 Jul 2017 15:24:33 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41621) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dUeGX-0008BK-5Y for qemu-devel@nongnu.org; Mon, 10 Jul 2017 15:22:44 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dUeGT-00078U-Qb for qemu-devel@nongnu.org; Mon, 10 Jul 2017 15:22:41 -0400 Received: from mail-wr0-f179.google.com ([209.85.128.179]:33527) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1dUeGT-00078B-KJ for qemu-devel@nongnu.org; Mon, 10 Jul 2017 15:22:37 -0400 Received: by mail-wr0-f179.google.com with SMTP id r103so151966375wrb.0 for ; Mon, 10 Jul 2017 12:22:37 -0700 (PDT) Received: from zen.linaro.local ([81.128.185.34]) by smtp.gmail.com with ESMTPSA id l73sm17172935wma.27.2017.07.10.12.21.30 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 10 Jul 2017 12:21:32 -0700 (PDT) Received: from zen.linaroharston (localhost [127.0.0.1]) by zen.linaro.local (Postfix) with ESMTP id C65D03E0A57; Mon, 10 Jul 2017 20:21:28 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=V65CAUygFd3FgfSYAI4WlSRIEmrkC8Vsu1/ZrV/v9Eo=; b=CBpdjjhJvPz5fbs5ABWddP3HczcOoukjY6GRx4yYbviSFeT3uuRzxG6KA9Bk+oSijr 2VpwPMeldS2nyGbOEDagBMLnQxf804gjkcC39S8avxl7euyXHiQBCs+0zPiuPxPAzY+p Oc2kAgEeDUl+wU/AQNVybU1rk+IVKZbaoQjN4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=V65CAUygFd3FgfSYAI4WlSRIEmrkC8Vsu1/ZrV/v9Eo=; b=rGHqU/JON1L4mLz78KDvOoONp4s7tD8nv30YgkArNigT9HpuUzFey/nhZ7CFoGRbbj aKQEDy5btanFiTKW5cbz8Em9W0aQMfKnI6HgIN8+XZmmmUCIg0RxEoCXOZladW8muewC ka3WA5iRFUtJ2FSTWm0vhh2cqX90An6ZgoGy1pw0mMrxXr48uadPWc8uGIrIhQ1KNltk mASFo7z+hEKQRhzUAddtWQUtrmiuJOjnETzStQp/awEeRpG9UUsYSU6m3IbLn6W1DCiT O4UIJFAIX8cn6prQo/n+d8u2DjXCXAmBDM/17AW9dAsCGECiQD/cXyoAqK2RyLhnky3/ kEAQ== X-Gm-Message-State: AIVw112RfMSGPnjLC5BtTIdj4XDE3rLmPhFAJJx+puobK8RbV7GNUVYp 7dUceNVwSDdI3P3Q X-Received: by 10.28.174.80 with SMTP id x77mr8970886wme.73.1499714496553; Mon, 10 Jul 2017 12:21:36 -0700 (PDT) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: peter.maydell@linaro.org, rth@twiddle.net, cota@braap.org Date: Mon, 10 Jul 2017 20:21:28 +0100 Message-Id: <20170710192128.9048-6-alex.bennee@linaro.org> X-Mailer: git-send-email 2.13.0 In-Reply-To: <20170710192128.9048-1-alex.bennee@linaro.org> References: <20170710192128.9048-1-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.85.128.179 Subject: [Qemu-devel] [PATCH v2 5/5] target/arm: use DISAS_EXIT for eret handling X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Joakim Bech , Etienne Carriere , =?UTF-8?q?Alex=20Benn=C3=A9e?= , qemu-devel@nongnu.org, "open list:ARM" Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_0 Z_629925259 SPT_0 Previously DISAS_JUMP did ensure this but with the optimisation of 8a6b28c7 (optimize indirect branches) we might not leave the loop. This means if any pending interrupts are cleared by changing IRQ flags we might never get around to servicing them. You usually notice this by seeing the lookup_tb_ptr() helper gainfully chaining TBs together while cpu->interrupt_request remains high and the exit_request has not been set. This breaks amongst other things the OPTEE test suite which executes an eret from the secure world after a non-secure world IRQ has gone pending which then never gets serviced. Instead of using the previously implied semantics of DISAS_JUMP we use DISAS_EXIT which will always exit the run-loop. Signed-off-by: Alex Benn=C3=A9e CC: Etienne Carriere CC: Joakim Bech CC: Peter Maydell CC: Emilio G. Cota CC: Richard Henderson Reviewed-by: Richard Henderson --- target/arm/translate-a64.c | 3 ++- target/arm/translate.c | 6 ++++-- 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c index ad46d84efb..48825f5722 100644 --- a/target/arm/translate-a64.c +++ b/target/arm/translate-a64.c @@ -1789,7 +1789,8 @@ static void disas_uncond_b_reg(DisasContext *s, uint3= 2_t insn) return; } gen_helper_exception_return(cpu_env); - s->is_jmp =3D DISAS_JUMP; + /* Must exit loop to check un-masked IRQs */ + s->is_jmp =3D DISAS_EXIT; return; case 5: /* DRPS */ if (rn !=3D 0x1f) { diff --git a/target/arm/translate.c b/target/arm/translate.c index 94aa4bbb4d..c67a4f90d4 100644 --- a/target/arm/translate.c +++ b/target/arm/translate.c @@ -4484,7 +4484,8 @@ static void gen_rfe(DisasContext *s, TCGv_i32 pc, TCG= v_i32 cpsr) */ gen_helper_cpsr_write_eret(cpu_env, cpsr); tcg_temp_free_i32(cpsr); - s->is_jmp =3D DISAS_JUMP; + /* Must exit loop to check un-masked IRQs */ + s->is_jmp =3D DISAS_EXIT; } =20 /* Generate an old-style exception return. Marks pc as dead. */ @@ -9528,7 +9529,8 @@ static void disas_arm_insn(DisasContext *s, unsigned = int insn) tmp =3D load_cpu_field(spsr); gen_helper_cpsr_write_eret(cpu_env, tmp); tcg_temp_free_i32(tmp); - s->is_jmp =3D DISAS_JUMP; + /* Must exit loop to check un-masked IRQs */ + s->is_jmp =3D DISAS_EXIT; } } break; --=20 2.13.0