ldconfig/x86: Store ISA level in cache and aux cache

Store ISA level in the portion of the unused upper 32 bits of the hwcaps
field in cache and the unused pad field in aux cache.  ISA level is stored
and checked only for shared objects in glibc-hwcaps subdirectories.  The
shared objects in the default directories aren't checked since there are
no fallbacks for these shared objects.

Tested on x86-64-v2, x86-64-v3 and x86-64-v4 machines with
--disable-hardcoded-path-in-tests and --enable-hardcoded-path-in-tests.

1 files changed, 13 insertions, 5 deletions

diff --git a/elf/ldconfig.c b/elf/ldconfig.c
index bbcf8f5c5c..28ed637a29 100644
--- a/elf/ldconfig.c
+++ b/elf/ldconfig.c
@@ -655,6 +655,7 @@ manual_link (char *library)
   struct stat64 stat_buf;
   int flag;
   unsigned int osversion;
+  unsigned int isa_level;
 
   /* Prepare arguments for create_links call.  Split library name in
      directory and filename first.  Since path is allocated, we've got
@@ -721,7 +722,7 @@ manual_link (char *library)
     }
 
   if (process_file (real_library, library, libname, &flag, &osversion,
-		    &soname, 0, &stat_buf))
+		    &isa_level, &soname, 0, &stat_buf))
     {
       error (0, 0, _("No link created since soname could not be found for %s"),
 	     library);
@@ -768,6 +769,7 @@ struct dlib_entry
   int flag;
   int is_link;
   unsigned int osversion;
+  unsigned int isa_level;
   struct dlib_entry *next;
 };
 
@@ -980,17 +982,21 @@ search_dir (const struct dir_entry *entry)
 	 library already and it's not changed.  */
       char *soname;
       unsigned int osversion;
-      if (!search_aux_cache (&lstat_buf, &flag, &osversion, &soname))
+      unsigned int isa_level;
+      if (!search_aux_cache (&lstat_buf, &flag, &osversion, &isa_level,
+			     &soname))
 	{
 	  if (process_file (real_name, file_name, direntry->d_name, &flag,
-			    &osversion, &soname, is_link, &lstat_buf))
+			    &osversion, &isa_level, &soname, is_link,
+			    &lstat_buf))
 	    {
 	      if (real_name != real_file_name)
 		free (real_name);
 	      continue;
 	    }
 	  else if (opt_build_cache)
-	    add_to_aux_cache (&lstat_buf, flag, osversion, soname);
+	    add_to_aux_cache (&lstat_buf, flag, osversion, isa_level,
+			      soname);
 	}
 
       if (soname == NULL)
@@ -1096,6 +1102,7 @@ search_dir (const struct dir_entry *entry)
 		  dlib_ptr->name = xstrdup (direntry->d_name);
 		  dlib_ptr->is_link = is_link;
 		  dlib_ptr->osversion = osversion;
+		  dlib_ptr->isa_level = isa_level;
 		}
 	      /* Don't add this library, abort loop.  */
 	      /* Also free soname, since it's dynamically allocated.  */
@@ -1112,6 +1119,7 @@ search_dir (const struct dir_entry *entry)
 	  dlib_ptr->flag = flag;
 	  dlib_ptr->is_link = is_link;
 	  dlib_ptr->osversion = osversion;
+	  dlib_ptr->isa_level = isa_level;
 	  /* Add at head of list.  */
 	  dlib_ptr->next = dlibs;
 	  dlibs = dlib_ptr;
@@ -1149,7 +1157,7 @@ search_dir (const struct dir_entry *entry)
       if (opt_build_cache)
 	add_to_cache (entry->path, filename, dlib_ptr->soname,
 		      dlib_ptr->flag, dlib_ptr->osversion,
-		      hwcap, entry->hwcaps);
+		      dlib_ptr->isa_level, hwcap, entry->hwcaps);
     }
 
   /* Free all resources.  */