[PATCH] ld.so: Add architecture specific fields

["H.J. Lu" <hongjiu dot lu at intel dot com>]

To support Intel Control-flow Enforcement Technology (CET) run-time
control:

1. An architecture specific field in the writable ld.so namespace is
needed to indicate if CET features are enabled at run-time.
2. An architecture specific field in struct link_map is needed if
CET features are enabled in an ELF module.

This patch adds dl-procruntime.c to the writable ld.so namespace and
link_map.h to struct link_map.

Tested on x86-64.

Any comments?

H.J.
--
	* elf/dl-support.c: Include <dl-procruntime.c>.
	* include/link.h: Include <link_map.h>.
	* sysdeps/generic/dl-procruntime.c: New file.
	* sysdeps/generic/link_map.h: Likewise.
	* sysdeps/generic/ldsodefs.h: Include <dl-procruntime.c> in
	the writable ld.so namespace.
---
 elf/dl-support.c                 |  1 +
 include/link.h                   |  2 ++
 sysdeps/generic/dl-procruntime.c |  1 +
 sysdeps/generic/ldsodefs.h       | 11 +++++++----
 sysdeps/generic/link_map.h       |  1 +
 5 files changed, 12 insertions(+), 4 deletions(-)
 create mode 100644 sysdeps/generic/dl-procruntime.c
 create mode 100644 sysdeps/generic/link_map.h

diff --git a/elf/dl-support.c b/elf/dl-support.c
index 5e3de90598..235d3a7f46 100644
--- a/elf/dl-support.c
+++ b/elf/dl-support.c
@@ -126,6 +126,7 @@ int _dl_starting_up = 1;
 void *_dl_random;
 
 /* Get architecture specific initializer.  */
+#include <dl-procruntime.c>
 #include <dl-procinfo.c>
 
 /* Initial value of the CPU clock.  */
diff --git a/include/link.h b/include/link.h
index 3e1b2aefb7..82b77a6b41 100644
--- a/include/link.h
+++ b/include/link.h
@@ -203,6 +203,8 @@ struct link_map
 				       freed, ie. not allocated with
 				       the dummy malloc in ld.so.  */
 
+#include <link_map.h>
+
     /* Collected information about own RPATH directories.  */
     struct r_search_path_struct l_rpath_dirs;
 
diff --git a/sysdeps/generic/dl-procruntime.c b/sysdeps/generic/dl-procruntime.c
new file mode 100644
index 0000000000..a056184690
--- /dev/null
+++ b/sysdeps/generic/dl-procruntime.c
@@ -0,0 +1 @@
+/* No architecture specific definitions.  */
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 5efae2d96d..52a792a597 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -373,6 +373,13 @@ struct rtld_global
   EXTERN void (*_dl_rtld_unlock_recursive) (void *);
 #endif
 
+  /* Get architecture specific definitions.  */
+#define PROCINFO_DECL
+#ifndef PROCINFO_CLASS
+# define PROCINFO_CLASS EXTERN
+#endif
+#include <dl-procruntime.c>
+
   /* If loading a shared object requires that we make the stack executable
      when it was not, we do it by calling this function.
      It returns an errno code or zero on success.  */
@@ -529,10 +536,6 @@ struct rtld_global_ro
 #endif
 
   /* Get architecture specific definitions.  */
-#define PROCINFO_DECL
-#ifndef PROCINFO_CLASS
-# define PROCINFO_CLASS EXTERN
-#endif
 #include <dl-procinfo.c>
 
   /* Names of shared object for which the RPATH should be ignored.  */
diff --git a/sysdeps/generic/link_map.h b/sysdeps/generic/link_map.h
new file mode 100644
index 0000000000..a056184690
--- /dev/null
+++ b/sysdeps/generic/link_map.h
@@ -0,0 +1 @@
+/* No architecture specific definitions.  */
-- 
2.13.6