Read Zephyr caller-saved registers if saved on IRQ context on ARC #56
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Since zephyrproject-rtos/zephyr@c3eeae8, Zephyr OS exposes offset of mode_exc_return in the arch struct for ARM. Accounting for this allows for consistency and enables logic with further offsets that may be added after this. Signed-off-by: Bruno Mendes <[email protected]>
Depending on the architecture, a different set of registers may be saved on a thread's stack in a cooperative vs. a preemptive switch. Signed-off-by: Bruno Mendes <[email protected]>
If a thread is preempted in an interrupt, we can read the caller-saved registers from its stack. Signed-off-by: Bruno Mendes <[email protected]>
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This ARC-specific patch allows reading caller-saved registers from the thread's stack if an interrupt entry caused them to be automatically pushed on the thread's stack (RIRQ) or by the ISR (FIRQ). One can test this in
gdbby fetching saved registers from an inactive thread.zephyrproject-rtos/zephyr#61106 is required for this to be effective, but
OpenOCDwon't break with this patch if Zephyr is not updated accordingly.This is based on #57, which was needed for adding further offsets.