diff options
Diffstat (limited to 'target/arm/helper.c')
| -rw-r--r-- | target/arm/helper.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/target/arm/helper.c b/target/arm/helper.c index 559065131a..8b07bf214e 100644 --- a/target/arm/helper.c +++ b/target/arm/helper.c @@ -7162,6 +7162,22 @@ static void do_v7m_exception_exit(ARMCPU *cpu) return; } + /* + * Tailchaining: if there is currently a pending exception that + * is high enough priority to preempt execution at the level we're + * about to return to, then just directly take that exception now, + * avoiding an unstack-and-then-stack. Note that now we have + * deactivated the previous exception by calling armv7m_nvic_complete_irq() + * our current execution priority is already the execution priority we are + * returning to -- none of the state we would unstack or set based on + * the EXCRET value affects it. + */ + if (armv7m_nvic_can_take_pending_exception(env->nvic)) { + qemu_log_mask(CPU_LOG_INT, "...tailchaining to pending exception\n"); + v7m_exception_taken(cpu, excret, true, false); + return; + } + switch_v7m_security_state(env, return_to_secure); { |