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[81.2.115.148]) by smtp.gmail.com with ESMTPSA id v184sm39476572wma.6.2019.04.16.05.58.14 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 16 Apr 2019 05:58:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=1XGXCtBKeeVzqgmtbhUu5EKggmcEdNkp9mStUCKfAYg=; b=aQXh9TLCiBDKxxFyc7z9c676WM+L2EGWTfMRBCFMewS+xTqueC6QV3JY+RO/rOdQri ei1Hz8LZ7SXdlnP+0obacr6NjovfYJVVUCJtH3O3OUrUVspkV5vqZzyz0TxP8JJIaGfV 3C1s8WRE5W+InPTOebW+oCRxicrDZg5he7neg9m/AeWRvL8HjcHMuxlKamq9fJ5ZA+rG EOHaLy23Sr1Q8j4tLH5qz/BC2oX91/tzY3UW2l+0aG7re+wnwaGg8etVOEE/uoLjv7ys yFXEPIqo83/0MqzOlD3xHD8ASh01fIJyD/BLiQ832DYajG8co0IulFeWauGHHEaTCbW5 RR4w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=1XGXCtBKeeVzqgmtbhUu5EKggmcEdNkp9mStUCKfAYg=; b=U5+jmnfRuZ2iFrowJYtT49iM4/F5bBetmcFyCJ82NuS/DeQf26vMfaVM8yhOmJXpyc 2PaV7J1LMqujlWlK+8KR0LWB9ZGjFvdazN5vM3KwKf4sNyDObbsBJX39hiBVdV8eoyeT KHnGh0Go2Bjr2h8XV/lN8m41/rDVCGrfaRV73f2xa6Q0Xkp+7gdQ5h1CVqBZkDxNxezQ 5u7rnz0khC+/C5LI2AtvRbjWAbGJJM0QNbRHKso88tRVVRFXSqx65POzQHePgS5iWneq fTBbNeBlZyFXD4hr5nBypWRt8EPlRpY9UDhgHcrjkkQ3Shc/SFsudZoXCKu/xSnRAmfQ fEHw== X-Gm-Message-State: APjAAAUPCqhhABrcmKCc1hYX6aMugcNJ0QYxVTeNkF+jQXrkYTFs/HkH dJ/96YqUTA5b4Y3Y96yx3p4ZAA== X-Google-Smtp-Source: APXvYqwRFMBP2LN+h0ov2Of/tRKw4IqMefPh9rJJR2iTWY+3QhpIn0eg86yc4q4dCAeBTarObDlDqg== X-Received: by 2002:adf:ec0a:: with SMTP id x10mr51756800wrn.193.1555419496176; Tue, 16 Apr 2019 05:58:16 -0700 (PDT) From: Peter Maydell To: qemu-arm@nongnu.org, qemu-devel@nongnu.org Date: Tue, 16 Apr 2019 13:57:31 +0100 Message-Id: <20190416125744.27770-14-peter.maydell@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190416125744.27770-1-peter.maydell@linaro.org> References: <20190416125744.27770-1-peter.maydell@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2a00:1450:4864:20::441 Subject: [Qemu-devel] [PATCH 13/26] target/arm: Clean excReturn bits when tail chaining 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" The TailChain() pseudocode specifies that a tail chaining exception should sanitize the excReturn all-ones bits and (if there is no FPU) the excReturn FType bits; we weren't doing this. Signed-off-by: Peter Maydell Reviewed-by: Richard Henderson --- target/arm/helper.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/target/arm/helper.c b/target/arm/helper.c index 8e72e1097ce..fe8e78fe36d 100644 --- a/target/arm/helper.c +++ b/target/arm/helper.c @@ -8081,6 +8081,14 @@ static void v7m_exception_taken(ARMCPU *cpu, uint32_= t lr, bool dotailchain, qemu_log_mask(CPU_LOG_INT, "...taking pending %s exception %d\n", targets_secure ? "secure" : "nonsecure", exc); =20 + if (dotailchain) { + /* Sanitize LR FType and PREFIX bits */ + if (!arm_feature(env, ARM_FEATURE_VFP)) { + lr |=3D R_V7M_EXCRET_FTYPE_MASK; + } + lr =3D deposit32(lr, 24, 8, 0xff); + } + if (arm_feature(env, ARM_FEATURE_V8)) { if (arm_feature(env, ARM_FEATURE_M_SECURITY) && (lr & R_V7M_EXCRET_S_MASK)) { --=20 2.20.1