[PATCH v5 01/31] target/arm: Implement arm_v7m_cpu_has_work()

[Philippe Mathieu-Daudé]

Implement SysemuCPUOps::has_work() handler for the ARM v7M CPU.

See the comments added in commit 7ecdaa4a963 ("armv7m: Fix
condition check for taking exceptions") which eventually
forgot to implement this has_work() handler:

  * ARMv7-M interrupt masking works differently than -A or -R.
  * There is no FIQ/IRQ distinction.

The NVIC signal any pending interrupt by raising ARM_CPU_IRQ
(see commit 56b7c66f498: "armv7m: QOMify the armv7m container")
which ends setting the CPU_INTERRUPT_HARD bit in interrupt_request.

Thus arm_v7m_cpu_has_work() implementation is thus quite trivial,
we simply need to check for this bit.

Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Michael Davidsaver <mdavidsaver@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 target/arm/cpu_tcg.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/target/arm/cpu_tcg.c b/target/arm/cpu_tcg.c
index 0d5adccf1a7..da348938407 100644
--- a/target/arm/cpu_tcg.c
+++ b/target/arm/cpu_tcg.c
@@ -23,6 +23,11 @@
 #if !defined(CONFIG_USER_ONLY) || !defined(TARGET_AARCH64)
 
 #if !defined(CONFIG_USER_ONLY) && defined(CONFIG_TCG)
+static bool arm_v7m_cpu_has_work(CPUState *cs)
+{
+    return cs->interrupt_request & CPU_INTERRUPT_HARD;
+}
+
 static bool arm_v7m_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
 {
     CPUClass *cc = CPU_GET_CLASS(cs);
@@ -920,6 +925,7 @@ static void arm_v7m_class_init(ObjectClass *oc, void *data)
 
     acc->info = data;
 #ifdef CONFIG_TCG
+    cc->has_work = arm_v7m_cpu_has_work;
     cc->tcg_ops = &arm_v7m_tcg_ops;
 #endif /* CONFIG_TCG */
 
-- 
2.31.1