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cpu-exec.c: Allow disabling of IRQs on ARM Cortex-M CPUs 

Correct an error in the logic for deciding whether we can
take an IRQ interrupt which meant that on M profile cores
it was never possible to disable them.

The design here is still bogus in that M profile doesn't
have separate "IRQ" and "FIQ", which are an A/R profile
concept; we should ideally implement the proper priority
based scheme.

Signed-off-by: David Hoover <spm@boiteauxlettres.sent.at>
[PMM: Wrote a proper commit message]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
David Hoover 2014-09-12 14:06:47 +01:00 committed by Peter Maydell
parent f022b8e953
commit c3c8d6b3dd
1 changed files with 2 additions and 2 deletions
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cpu-exec.c
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@ -618,8 +618,8 @@ int cpu_exec(CPUArchState *env)
We avoid this by disabling interrupts when We avoid this by disabling interrupts when
pc contains a magic address. */ pc contains a magic address. */
if (interrupt_request & CPU_INTERRUPT_HARD if (interrupt_request & CPU_INTERRUPT_HARD
&& ((IS_M(env) && env->regs[15] < 0xfffffff0) && !(env->daif & PSTATE_I)
|| !(env->daif & PSTATE_I))) { && (!IS_M(env) || env->regs[15] < 0xfffffff0)) {
cpu->exception_index = EXCP_IRQ; cpu->exception_index = EXCP_IRQ;
cc->do_interrupt(cpu); cc->do_interrupt(cpu);
next_tb = 0; next_tb = 0;