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[174.21.142.130]) by smtp.gmail.com with ESMTPSA id rj14-20020a17090b3e8e00b001bf50a8b468sm11460595pjb.51.2022.03.10.10.45.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 10 Mar 2022 10:45:07 -0800 (PST) Message-ID: <4fdb9043-1d05-dcac-3f7f-fdd84986b9ac@linaro.org> Date: Thu, 10 Mar 2022 10:45:05 -0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Subject: Re: [PATCH v5 11/48] target/nios2: Do not zero the general registers on reset Content-Language: en-US To: Peter Maydell References: <20220310112725.570053-1-richard.henderson@linaro.org> <20220310112725.570053-12-richard.henderson@linaro.org> From: Richard Henderson In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Host-Lookup-Failed: Reverse DNS lookup failed for 2607:f8b0:4864:20::633 (failed) Received-SPF: pass client-ip=2607:f8b0:4864:20::633; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x633.google.com X-Spam_score_int: -6 X-Spam_score: -0.7 X-Spam_bar: / X-Spam_report: (-0.7 / 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, PDS_HP_HELO_NORDNS=0.659, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: marex@denx.de, amir.gonnen@neuroblade.ai, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 3/10/22 04:21, Peter Maydell wrote: > On Thu, 10 Mar 2022 at 11:27, Richard Henderson > wrote: >> >> The bulk of the general register set is undefined on reset. > > They might be architecturally undefined, but for QEMU's > purposes we want the state of the CPU on reset to be > identical to the state it is in when QEMU is first started. Ok, I've dropped this. The intent had been to remove a user/sysemu difference when we get to introducing shadow regs, but it isn't that big of a deal. r~