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Qualcomm-proprietary Remote Procedure Call (RPC) mechanism used to enable remote function calls between the CPU and DSP. Snapdragon 855 (SM8150) SoC, embedded in mobile phones such as Pixel 4, Samsung S10, Xiaomi Mi 9, LG G8, and OnePlus 7, includes Kryo CPU, Adreno 640, and four separate DSPs, each devoted to a specific application space: sensor, modem, audio (aDSP), and compute (cDSP) The security issues that we discovered are applicable to both.