[PULL 37/38] target/arm/hvf/hvf: Document $pc adjustment in HVF & SMC

[Peter Maydell]

From: Philippe Mathieu-Daudé <phi...@linaro.org>

Signed-off-by: Philippe Mathieu-Daudé <phi...@linaro.org>
Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
Signed-off-by: Peter Maydell <peter.mayd...@linaro.org>
---
 target/arm/hvf/hvf.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c
index f31b6e54ee7..805fe75e6b1 100644
--- a/target/arm/hvf/hvf.c
+++ b/target/arm/hvf/hvf.c
@@ -1936,6 +1936,7 @@ static int hvf_handle_exception(CPUState *cpu, 
hv_vcpu_exit_exception_t *excp)
     case EC_AA64_HVC:
         cpu_synchronize_state(cpu);
         if (arm_is_psci_call(arm_cpu, EXCP_HVC)) {
+            /* Do NOT advance $pc for HVC */
             if (!hvf_handle_psci_call(cpu)) {
                 trace_hvf_unknown_hvc(env->pc, env->xregs[0]);
                 /* SMCCC 1.3 section 5.2 says every unknown SMCCC call returns 
-1 */
@@ -1949,6 +1950,7 @@ static int hvf_handle_exception(CPUState *cpu, 
hv_vcpu_exit_exception_t *excp)
     case EC_AA64_SMC:
         cpu_synchronize_state(cpu);
         if (arm_is_psci_call(arm_cpu, EXCP_SMC)) {
+            /* Secure Monitor Call exception, we need to advance $pc */
             advance_pc = true;
 
             if (!hvf_handle_psci_call(cpu)) {
-- 
2.43.0