@startuml
!include card-uml-style.iuml
scale 900 width
top to bottom direction

class "01  TaskFunction_t\nvoid (*)(void*)" as Callback <<C ABI>>
class "02  xTaskCreate\nentry + &workerA" as Create <<boundary>>
class "03  callback entry\na0 = pvParameters" as Entry <<runtime>>
class "04  typed pointer\nWorkerContext *worker =\n(WorkerContext *)pvParameters" as Cast <<C>>
class "05  typed calculation\nworker->result = sum" as Work <<application>>
class "06  wrong-cast exhibit\nC cannot verify context type" as Hazard <<compile-time check>>

Callback -right-> Create : accepted signature
Create -right-> Entry : scheduler dispatch
Entry -down-> Cast : same address
Cast -left-> Work : typed fields
Work -left-> Hazard : contrast: unchecked cast

note bottom of Entry
  RV32 ILP32 ABI carries the first callback argument in a0.
  The explicit C cast documents intent; it performs no type check.
end note
@enduml