8261966: macOS M1: report in hs_err log if we are running x86 code in emulation mode (Rosetta)

Reviewed-by: dcubed, mikael, dholmes

Author: Gerard Ziemski

src/hotspot/os/bsd/os_bsd.cpp

@@ -1401,7 +1401,13 @@ void os::get_summary_cpu_info(char* buf, size_t buflen) {
       strncpy(machine, "", sizeof(machine));
   }
 
-  snprintf(buf, buflen, "%s %s %d MHz", model, machine, mhz);
+  const char* emulated = "";
+#ifdef __APPLE__
+  if (VM_Version::is_cpu_emulated()) {
+    emulated = " (EMULATED)";
+  }
+#endif
+  snprintf(buf, buflen, "\"%s\" %s%s %d MHz", model, machine, emulated, mhz);
 }
 
 void os::print_memory_info(outputStream* st) {

src/hotspot/share/runtime/os.cpp

@@ -1033,6 +1033,11 @@ void os::print_environment_variables(outputStream* st, const char** env_list) {
 void os::print_cpu_info(outputStream* st, char* buf, size_t buflen) {
   // cpu
   st->print("CPU:");
+#ifdef __APPLE__
+   if (VM_Version::is_cpu_emulated()) {
+     st->print(" (EMULATED)");
+   }
+#endif
   st->print(" total %d", os::processor_count());
   // It's not safe to query number of active processors after crash
   // st->print("(active %d)", os::active_processor_count()); but we can