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There is an enormous error in the system call dispatch logic; if a task is inside a critical section (local interrupts disabled) there is a chance that during a context switch when the task resumes, local interrupts are erroneously ENABLED. This obviously leads to unexpected crashes and such. This happens when the CPU status has Previous Interrupt Enable (PIE) set to 1, even though Interrupt Enable (IE) is set to 0. When the system call returns via ERET, the CPU sets PIE->IE and if PIE=1 interrupts get enabled. This is fixed easily by explicitly CLEARING PIE from the register save area, if IE=0 when the system call was started. |
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| CMakeLists.txt | ||
| Kconfig | ||