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If an application task encounters a problem that leads to a stack corruption, the stack used by the OS kernel and other tasks is still likely to be intact, thus helping to improve system reliability.
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The stack space for each task only needs to cover the maximum stack usage plus one level of stack frame (maximum 9 words including padding in Cortex-M3 or Cortex-M4 without floating point unit, or maximum 27 words for Cortex-M4 with floating point unit). Stack space needed for the ISR and nested interrupt handling is allocated in the main stack only.
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It makes it easy to create an efficient OS for the Cortex-M processors.
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An OS can also utilize the Memory Protection Unit (MPU) to define the stack region which an application task can use. If an application task has a stack overflow problem, the MPU can trigger a MemManage fault exception and prevent the task from overwriting memory regions outside the allocated stack space for this task.
