Use kinfo_getvmmap on FreeBSD to enumerate memory regions.

Use kinfo_getvmmap from libutil on FreeBSD to enumerate memory
regions in a running process instead of /proc/<pid>/map.  FreeBSD systems
do not mount procfs by default, but kinfo_getvmmap uses a sysctl that
is always available.

Skip memory regions for devices as well as regions an application has
requested to not be dumped via the MAP_NOCORE flag to mmap or
MADV_NOCORE advice to madvise.

gdb/ChangeLog:

	* configure.ac: AC_CHECK_LIB(util, kinfo_getvmmap).
	* configure: Regenerate.
	* config.in: Regenerate.
	* fbsd-nat.c [!HAVE_KINFO_GETVMMAP] (fbsd_read_mapping): Don't
        define.
	(fbsd_find_memory_regions): Use kinfo_getvmmap to
	enumerate memory regions if present.

1 files changed, 60 insertions, 0 deletions

diff --git a/gdb/configure b/gdb/configure
index cca0aeb..78d206b 100755
--- a/gdb/configure
+++ b/gdb/configure
@@ -7159,6 +7159,66 @@ if test "$ac_res" != no; then :
 fi
 
 
+# On FreeBSD we may need libutil for kinfo_getvmmap (used by fbsd-nat.c).
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing kinfo_getvmmap" >&5
+$as_echo_n "checking for library containing kinfo_getvmmap... " >&6; }
+if test "${ac_cv_search_kinfo_getvmmap+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_func_search_save_LIBS=$LIBS
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char kinfo_getvmmap ();
+int
+main ()
+{
+return kinfo_getvmmap ();
+  ;
+  return 0;
+}
+_ACEOF
+for ac_lib in '' util; do
+  if test -z "$ac_lib"; then
+    ac_res="none required"
+  else
+    ac_res=-l$ac_lib
+    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
+  fi
+  if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_search_kinfo_getvmmap=$ac_res
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext
+  if test "${ac_cv_search_kinfo_getvmmap+set}" = set; then :
+  break
+fi
+done
+if test "${ac_cv_search_kinfo_getvmmap+set}" = set; then :
+
+else
+  ac_cv_search_kinfo_getvmmap=no
+fi
+rm conftest.$ac_ext
+LIBS=$ac_func_search_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_kinfo_getvmmap" >&5
+$as_echo "$ac_cv_search_kinfo_getvmmap" >&6; }
+ac_res=$ac_cv_search_kinfo_getvmmap
+if test "$ac_res" != no; then :
+  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
+
+$as_echo "#define HAVE_KINFO_GETVMMAP 1" >>confdefs.h
+
+fi
+
+