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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.

Backports commit a73c98e159d18155445d29b6044be6ad49fd802f from qemu
This commit is contained in:
Michael Davidsaver 2018-03-02 18:36:58 -05:00 committed by Lioncash
parent b7bf752d3c
commit f532e80749
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1 changed files with 0 additions and 2 deletions
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qemu/target/arm/helper.c
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@ -5448,8 +5448,6 @@ 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);