[binutils-gdb] Handle an edge case for minisym TLS variable lookups.

[John Baldwin <jhb at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=df22c1e5d53c38f38bce6072bb46de240f9e0e2b

commit df22c1e5d53c38f38bce6072bb46de240f9e0e2b
Author: John Baldwin <jhb@FreeBSD.org>
Date:   Tue Mar 12 13:39:02 2019 -0700

    Handle an edge case for minisym TLS variable lookups.
    
    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.

Diff:
---
 gdb/ChangeLog    | 5 +++++
 gdb/solib-svr4.c | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index c91e975..f025452 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,10 @@
 2019-03-12  John Baldwin  <jhb@FreeBSD.org>
 
+	* solib-svr4.c (svr4_fetch_objfile_link_map): Look for
+	objfile->separate_debug_objfile_backlink if not NULL.
+
+2019-03-12  John Baldwin  <jhb@FreeBSD.org>
+
 	* amd64-bsd-nat.c (amd64bsd_fetch_inferior_registers): Use
 	tdep->fsbase_regnum instead of constants for fs_base and gs_base.
 	(amd64bsd_store_inferior_registers): Likewise.
diff --git a/gdb/solib-svr4.c b/gdb/solib-svr4.c
index 84693c1..14a471b 100644
--- a/gdb/solib-svr4.c
+++ b/gdb/solib-svr4.c
@@ -1551,6 +1551,11 @@ 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)