[PATCH v2 03/11] Handle an edge case for minisym TLS variable lookups.

[John Baldwin <jhb@FreeBSD.org>]

If a TLS variable is provided by a minisym from a separate debug file,
the separate debug file is passed to
gdbarch_fetch_tls_load_module_address.  However, the object files
stored in the shared object list are the original object files, not
the separate debug object files.  In this case,
svr4_fetch_objfile_link_map was failing to find the link map entry
since the debug object file is not in its internal list, only the
original object file.

gdb/ChangeLog:

	* solib-svr4.c (svr4_fetch_objfile_link_map): Look for
	objfile->separate_debug_objfile_backlink if not NULL.
---
 gdb/ChangeLog    | 5 +++++
 gdb/solib-svr4.c | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 9751118c0e..7f4e912ad3 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2019-02-08  John Baldwin  <jhb@FreeBSD.org>
+
+	* solib-svr4.c (svr4_fetch_objfile_link_map): Look for
+	objfile->separate_debug_objfile_backlink if not NULL.
+
 2019-02-08  John Baldwin  <jhb@FreeBSD.org>
 
 	* amd64-bsd-nat.c (amd64bsd_fetch_inferior_registers): Use
diff --git a/gdb/solib-svr4.c b/gdb/solib-svr4.c
index 787b98ba26..d7a792580d 100644
--- a/gdb/solib-svr4.c
+++ b/gdb/solib-svr4.c
@@ -1548,6 +1548,11 @@ svr4_fetch_objfile_link_map (struct objfile *objfile)
   if (objfile == symfile_objfile)
     return info->main_lm_addr;
 
+  /* If OBJFILE is a separate debug object file, look for the
+     original object file.  */
+  if (objfile->separate_debug_objfile_backlink != NULL)
+    objfile = objfile->separate_debug_objfile_backlink;
+
   /* The other link map addresses may be found by examining the list
      of shared libraries.  */
   for (so = master_so_list (); so; so = so->next)
-- 
2.19.2