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[189.204.159.168]) by smtp.gmail.com with ESMTPSA id z77sm357524ooa.37.2020.12.01.05.16.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 01 Dec 2020 05:16:45 -0800 (PST) Subject: Re: [PATCH v2 10/28] target/arm: Implement M-profile FPSCR_nzcvqc To: Peter Maydell , qemu-arm@nongnu.org, qemu-devel@nongnu.org References: <20201119215617.29887-1-peter.maydell@linaro.org> <20201119215617.29887-11-peter.maydell@linaro.org> From: Richard Henderson Message-ID: Date: Tue, 1 Dec 2020 07:16:42 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20201119215617.29887-11-peter.maydell@linaro.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::c44; envelope-from=richard.henderson@linaro.org; helo=mail-oo1-xc44.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 11/19/20 3:55 PM, Peter Maydell wrote: > v8.1M defines a new FP system register FPSCR_nzcvqc; this behaves > like the existing FPSCR, except that it reads and writes only bits > [31:27] of the FPSCR (the N, Z, C, V and QC flag bits). (Unlike the > FPSCR, the special case for Rt=15 of writing the CPSR.NZCV is not > permitted.) > > Implement the register. Since we don't yet implement MVE, we handle > the QC bit as RES0, with todo comments for where we will need to add > support later. > > Signed-off-by: Peter Maydell > --- > target/arm/cpu.h | 13 +++++++++++++ > target/arm/translate-vfp.c.inc | 27 +++++++++++++++++++++++++++ > 2 files changed, 40 insertions(+) Reviewed-by: Richard Henderson r~