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__code cbc_swi_handler(struct trapframe* r) {
    if (proc->killed) {
        goto exit();
    }
    proc->tf = r;
    goto syscall->perform();
}

__code cbc_swi_handler_stub(struct trapframe* r) {
    struct Context* proc_context = &proc->cbc_context;
    struct Context* kernel       = &kernel_context->context;
    struct Syscall* syscall      = Gearef(kernel, Syscall)->syscall;
    goto cbc_swi_handler(proc_context, r, syscall);
}