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armv7m: Escalate exceptions to HardFault if necessary

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The v7M exception architecture requires that if a synchronous
exception cannot be taken immediately (because it is disabled
or at too low a priority) then it should be escalated to
HardFault (and the HardFault exception is then taken).
Implement this escalation logic.

Signed-off-by: Michael Davidsaver <mdavidsaver@gmail.com>
[PMM: extracted from another patch]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
This commit is contained in:
Michael Davidsaver 2017-02-28 12:08:17 +00:00 • committed by Peter Maydell
parent 7c14b3ac07
commit a73c98e159
2 changed files with 53 additions and 2 deletions
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2
target/arm/helper.c
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@ -6106,8 +6106,6 @@ void arm_v7m_cpu_do_interrupt(CPUState *cs)
/* For exceptions we just mark as pending on the NVIC, and let that
handle it. */
/* TODO: Need to escalate if the current priority is higher than the
one we're raising. */
switch (cs->exception_index) {
case EXCP_UDEF:
armv7m_nvic_set_pending(env->nvic, ARMV7M_EXCP_USAGE);