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[97.113.7.119]) by smtp.gmail.com with ESMTPSA id d2sm13446951pjs.21.2019.08.19.14.38.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Aug 2019 14:38:31 -0700 (PDT) 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; bh=cT5iUCtc/TpahCb9mQHDGpDMCKYLz7wFvW1IJP8R1rM=; b=Lt6jyPRXPkhYjZoDRfVNn+cQMWd2wYuXE5YkYeaJGJs2Ch45FXr200uR+MKGQR7bob R8NDvUDCFDCznJ49LSZ2RMNuoO8t7fgNy2C1k8rQvCgXdcuhEVfnwO7PHucoKQEZgaum n4ZOX1dbw1td4u9DkI43VzPI6NWtAlta2Ozboa18zo/6h+F1Tv4Nc2NMxMcjOkjwZMMK mE/zKVVKx4Jrv8l0bnVEwGxDPKULjBtvWxAnT6cXtvK1XPLs5/GFODlhATZURdarx2Gs Dj93p7LFEYhaq4hyu8eHK8GOYc7odqX2gViuVp1+2dy/im8rcTEFefrM/GAh6X/rBbOv ubnQ== 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; bh=cT5iUCtc/TpahCb9mQHDGpDMCKYLz7wFvW1IJP8R1rM=; b=mPmIkNcBpge74rIYzCGy/X+s4aavjG9AG6KXXEIxIt47VclaRXQieMmOT3LznahmVa d4NEDJSxktM43LQ7oXHJGdz+MXUfMofkWPzHI8bTUOOBdMD1ZpMBuyncsQfpdKGTgD5e 2L+z/Z4xYIvkCTo3h4y8R6XKdpnsxW2uHIcOc16EBafLv3pf6EbwPRCfnIrj/dwQ7Krf +mecA8vhVe9rDDtizjKXn3Rw0/qGrmgdNW94bDwq6Hcta+qTlukLsqB0QXHdhDz71EP1 NHDimJ9AqdLGJYO3nElQ3fovGD1NjRj/t0M60Ju5CJWvqvJjy/lUhtYzmLU3wpntPNIB dGNA== X-Gm-Message-State: APjAAAU6KIOPR1U7D6mneMsc6klvML1Qfi73qHCUN8psORNB4ySHIQ40 yZWRc+28/o3BzoBrsGXtLMvxoduDy6k= X-Google-Smtp-Source: APXvYqzNx/G53Ww2bd4M4Kelw+Tb7DFpP8ZKBQuQccfTQt41YgvxxZKIMcYY8Eg3QMEVYMmexjvT3Q== X-Received: by 2002:aa7:97aa:: with SMTP id d10mr26529772pfq.176.1566250712299; Mon, 19 Aug 2019 14:38:32 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Mon, 19 Aug 2019 14:37:15 -0700 Message-Id: <20190819213755.26175-29-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190819213755.26175-1-richard.henderson@linaro.org> References: <20190819213755.26175-1-richard.henderson@linaro.org> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::543 Subject: [Qemu-devel] [PATCH v2 28/68] target/arm: Diagnose writeback register in list for LDM for v7 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, qemu-arm@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Prior to v7, for the A32 encoding, this operation wrote an UNKNOWN value back to the base register. Starting in v7 this is UNPREDICTABLE. Signed-off-by: Richard Henderson Reviewed-by: Peter Maydell --- target/arm/translate.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/target/arm/translate.c b/target/arm/translate.c index 4451adbb97..29e2eae441 100644 --- a/target/arm/translate.c +++ b/target/arm/translate.c @@ -9880,6 +9880,14 @@ static bool do_ldm(DisasContext *s, arg_ldst_block *= a) =20 static bool trans_LDM_a32(DisasContext *s, arg_ldst_block *a) { + /* + * Writeback register in register list is UNPREDICATABLE + * for ArchVersion() >=3D 7. Prior to v7, A32 would write + * an UNKNOWN value to the base register. + */ + if (ENABLE_ARCH_7 && a->w && (a->list & (1 << a->rn))) { + return false; + } return do_ldm(s, a); } =20 --=20 2.17.1