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[79.149.41.65]) by smtp.gmail.com with ESMTPSA id u4sm22908727wrq.22.2019.11.18.05.15.59 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 18 Nov 2019 05:16:00 -0800 (PST) Subject: Re: [PATCH 2/2] target/arm: Relax r13 restriction for ldrex/strex for v8.0 To: Peter Maydell References: <20191117090621.32425-1-richard.henderson@linaro.org> <20191117090621.32425-3-richard.henderson@linaro.org> From: Richard Henderson Openpgp: preference=signencrypt Message-ID: Date: Mon, 18 Nov 2019 14:15:57 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2a00:1450:4864:20::444 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: QEMU Developers Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 11/18/19 2:10 PM, Peter Maydell wrote: >> /* We UNDEF for these UNPREDICTABLE cases. */ >> if (a->rn == 15 || a->rt == 15 >> - || (s->thumb && a->rt == 13) >> + || (!ENABLE_ARCH_8 && s->thumb && a->rt == 13) >> || (mop == MO_64 >> && (a->rt2 == 15 || a->rt == a->rt2 >> - || (s->thumb && a->rt2 == 13)))) { >> + || (!ENABLE_ARCH_8 && s->thumb && a->rt2 == 13)))) { >> unallocated_encoding(s); >> return true; >> } > > These cases for r13 are indeed no longer UNPREDICTABLE in > v8A, but they are still marked as UNPREDICTABLE for v8M... Ho hum. I knew I should have looked at that doc as well... r~