Function riscv_rt::start_trap_rust

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#[link_section = ".trap.rust"]
#[export_name = "_start_trap_rust"]pub extern "C" fn start_trap_rust(trap_frame: *const TrapFrame)

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Trap entry point rust (_start_trap_rust)

mcause is read to determine the cause of the trap. XLEN-1 bit indicates if it's an interrupt or an exception. The result is examined and ExceptionHandler or one of the core interrupt handlers is called.