diff -r c7a3e57fdf4a -r b985cbb00e68 src/os/bsd/vm/os_bsd.cpp
--- a/src/os/bsd/vm/os_bsd.cpp	Thu Aug 01 03:44:03 2019 +0100
+++ b/src/os/bsd/vm/os_bsd.cpp	Mon Aug 12 18:30:40 2019 +0300
@@ -1690,6 +1690,53 @@
 #endif
 }
 
+int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) {
+#ifdef RTLD_DI_LINKMAP
+  Dl_info dli;
+  void *handle;
+  Link_map *map;
+  Link_map *p;
+
+  if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 ||
+      dli.dli_fname == NULL) {
+    return 1;
+  }
+  handle = dlopen(dli.dli_fname, RTLD_LAZY);
+  if (handle == NULL) {
+    return 1;
+  }
+  dlinfo(handle, RTLD_DI_LINKMAP, &map);
+  if (map == NULL) {
+    dlclose(handle);
+    return 1;
+  }
+
+  while (map->l_prev != NULL)
+    map = map->l_prev;
+
+  while (map != NULL) {
+    // Value for top_address is returned as 0 since we don't have any information about module size
+    if (callback(map->l_name, (address)map->l_addr, (address)0, param)) {
+      dlclose(handle);
+      return 1;
+    }
+    map = map->l_next;
+  }
+
+  dlclose(handle);
+#elif defined(__APPLE__)
+  for (uint32_t i = 1; i < _dyld_image_count(); i++) {
+    // Value for top_address is returned as 0 since we don't have any information about module size
+    if (callback(_dyld_get_image_name(i), (address)_dyld_get_image_header(i), (address)0, param)) {
+      return 1;
+    }
+  }
+  return 0;
+#else
+  return 1;
+#endif
+}
+
 void os::print_os_info_brief(outputStream* st) {
   st->print("Bsd");
 
@@ -2562,6 +2609,10 @@
   RESTARTABLE_RETURN_INT(::read(fd, buf, nBytes));
 }
 
+size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) {
+  RESTARTABLE_RETURN_INT(::pread(fd, buf, nBytes, offset));
+}
+
 // TODO-FIXME: reconcile Solaris' os::sleep with the bsd variation.
 // Solaris uses poll(), bsd uses park().
 // Poll() is likely a better choice, assuming that Thread.interrupt()