On 01/30/2018 07:02 AM, Peter Maydell wrote: > In order to support derived exceptions (exceptions generated in > the course of trying to take an exception), we need to be able > to handle prioritizing whether to take the original exception > or the derived exception. > > We do this by introducing a new function > armv7m_nvic_set_pending_derived() which the exception-taking code in > helper.c will call when a derived exception occurs. Derived > exceptions are dealt with mostly like normal pending exceptions, so > we share the implementation with the armv7m_nvic_set_pending() > function. > > Note that the way we structure this is significantly different > from the v8M Arm ARM pseudocode: that does all the prioritization > logic in the DerivedLateArrival() function, whereas we choose to > let the existing "identify highest priority exception" logic > do the prioritization for us. The effect is the same, though. > > Signed-off-by: Peter Maydell <peter.mayd...@linaro.org> > --- > target/arm/cpu.h | 13 ++++++++++ > hw/intc/armv7m_nvic.c | 68 > +++++++++++++++++++++++++++++++++++++++++++++++++-- > hw/intc/trace-events | 2 +- > 3 files changed, 80 insertions(+), 3 deletions(-)
Reviewed-by: Richard Henderson <richard.hender...@linaro.org> r~
