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[174.21.142.130]) by smtp.gmail.com with ESMTPSA id l5-20020a63f305000000b0039daaa10a1fsm20480787pgh.65.2022.04.20.12.52.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 20 Apr 2022 12:52:30 -0700 (PDT) Message-ID: <962f7ef4-7dcc-fb5d-5e55-90eb3ba65e47@linaro.org> Date: Wed, 20 Apr 2022 12:52:28 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.8.0 Subject: Re: [RFC PATCH v3 2/5] ppc64: Fix semihosting on ppc64le Content-Language: en-US To: Peter Maydell , Leandro Lupori References: <20220418191100.270334-1-leandro.lupori@eldorado.org.br> <20220418191100.270334-3-leandro.lupori@eldorado.org.br> From: Richard Henderson In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::42a; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x42a.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, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham 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: danielhb413@gmail.com, qemu-devel@nongnu.org, groug@kaod.org, qemu-ppc@nongnu.org, clg@kaod.org, pbonzini@redhat.com, alex.bennee@linaro.org, david@gibson.dropbear.id.au Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 4/20/22 12:42, Peter Maydell wrote: > On Mon, 18 Apr 2022 at 20:19, Leandro Lupori > wrote: >> >> PPC64 CPUs can change its endian dynamically, so semihosting code >> must check its MSR at run time to determine if byte swapping is >> needed. > > Arm CPUs also change endianness dynamically, so why is this > change PPC-specific ? I'm reasonably certain that we simply don't test armbe or aarch64_be semihosting. Leandro found this because qemu-system-ppc64 defaults to BE and qemu-system-aarch64 defaults to LE. r~