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charset="Windows-1252" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Received-SPF: pass client-ip=199.106.114.38; envelope-from=bcain@quicinc.com; helo=alexa-out-sd-01.qualcomm.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 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, RCVD_IN_DNSWL_MED=-2.3, 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: , Cc: Michael Lambert , Sid Manning Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" My team is working on sysemu support for Hexagon. We've made some good pro= gress so far and we'll work on upstreaming after Taylor=92s hexagon linux-u= ser patch series lands. The only use case we have focused on with sysemu is booting/running elf pro= grams. Both "-device loader,file=3D..." or "-kernel" are effective and wor= k similarly. We have implemented "angel calls" (semihosting) to do host I/= O. We have not yet tried using the QEMU semihosting features/cmdline args,= but may explore that option. One feature we'd like to integrate is a guest library search path feature. = The existing hexagon simulator program distributed in the Hexagon SDK has = a command line option, =93--usefs". The manual states that it =93Cause[s] = the simulator to search for files in the directory with the specified path.= It is used for accessing shared object files that are loaded during progra= m execution.=94 If the guest OS has a loader that tries to resolve an exec= utable or library's DT_NEEDED shared object libraries, we would want QEMU a= ngel calls to be able to search a user specified host-path for the toolchai= n language support libraries. This feature is like the functionality in QEMU=92s =93QEMU_LD_PREFIX=94 env= ironment variable used by linux-userspace. So, one idea was to just (ab)us= e this interface to mean the same thing for sysemu. We could make it a tar= get-specific hexagon feature, if it doesn=92t make sense to have it as targ= et-independent. And if it makes sense we could qualify it like HEXAGON_QEM= U_LD_PREFIX. If not this environment variable, is there an existing QEMU feature that ma= ps well here? Or is there a better interface that we should consider inste= ad? -Brian