diff -r 274a1ea904c8 -r fd44df5e3bc3 src/os/aix/vm/os_aix.cpp
--- a/src/os/aix/vm/os_aix.cpp	Wed Oct 14 16:43:13 2020 +0800
+++ b/src/os/aix/vm/os_aix.cpp	Wed Oct 14 17:44:48 2020 +0800
@@ -1555,6 +1555,11 @@
   st->cr();
 }
 
+int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
+  // Not yet implemented.
+  return 0;
+}
+
 void os::print_memory_info(outputStream* st) {
 
   st->print_cr("Memory:");
@@ -2793,6 +2798,10 @@
   return ::read(fd, buf, nBytes);
 }
 
+size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
+  return ::pread(fd, buf, nBytes, offset);
+}
+
 #define NANOSECS_PER_MILLISEC 1000000
 
 int os::sleep(Thread* thread, jlong millis, bool interruptible) {