[glibc] ld.so: Export tls_init_tp_called as __rtld_tls_init_tp_called

[Florian Weimer <fw@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a65ff76c9a1811dd2396ab45563f645579c0e687

commit a65ff76c9a1811dd2396ab45563f645579c0e687
Author: Florian Weimer <fweimer@redhat.com>
Date:   Thu Oct 27 11:36:44 2022 +0200

    ld.so: Export tls_init_tp_called as __rtld_tls_init_tp_called
    
    This allows the rest of dynamic loader to check whether the TCB
    has been set up (and THREAD_GETMEM and THREAD_SETMEM will work).
    
    Reviewed-by: Siddhesh Poyarekar <siddhesh@gotplt.org>

Diff:
---
 elf/rtld.c                 | 10 +++++-----
 sysdeps/generic/ldsodefs.h |  3 +++
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/elf/rtld.c b/elf/rtld.c
index 3b78f40562..221be5c71e 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -730,7 +730,7 @@ match_version (const char *string, struct link_map *map)
   return 0;
 }
 
-static bool tls_init_tp_called;
+bool __rtld_tls_init_tp_called;
 
 static void *
 init_tls (size_t naudit)
@@ -800,7 +800,7 @@ cannot allocate TLS data structures for initial thread\n");
   if (__glibc_unlikely (lossage != NULL))
     _dl_fatal_printf ("cannot set up thread-local storage: %s\n", lossage);
   __tls_init_tp ();
-  tls_init_tp_called = true;
+  __rtld_tls_init_tp_called = true;
 
   return tcbp;
 }
@@ -2050,7 +2050,7 @@ dl_main (const ElfW(Phdr) *phdr,
      an old kernel that can't perform TLS_INIT_TP, even if no TLS is ever
      used.  Trying to do it lazily is too hairy to try when there could be
      multiple threads (from a non-TLS-using libpthread).  */
-  bool was_tls_init_tp_called = tls_init_tp_called;
+  bool was_tls_init_tp_called = __rtld_tls_init_tp_called;
   if (tcbp == NULL)
     tcbp = init_tls (0);
 
@@ -2321,7 +2321,7 @@ dl_main (const ElfW(Phdr) *phdr,
 			       consider_profiling);
 
 	/* Add object to slot information data if necessasy.  */
-	if (l->l_tls_blocksize != 0 && tls_init_tp_called)
+	if (l->l_tls_blocksize != 0 && __rtld_tls_init_tp_called)
 	  _dl_add_to_slotinfo (l, true);
       }
   }
@@ -2347,7 +2347,7 @@ dl_main (const ElfW(Phdr) *phdr,
   _dl_allocate_tls_init (tcbp, false);
 
   /* And finally install it for the main thread.  */
-  if (! tls_init_tp_called)
+  if (! __rtld_tls_init_tp_called)
     {
       const char *lossage = TLS_INIT_TP (tcbp);
       if (__glibc_unlikely (lossage != NULL))
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 6b256b8388..0223aa9f12 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -1219,6 +1219,9 @@ extern void *_dl_allocate_tls_storage (void) attribute_hidden;
 extern void *_dl_allocate_tls_init (void *, bool);
 rtld_hidden_proto (_dl_allocate_tls_init)
 
+/* True if the TCB has been set up.  */
+extern bool __rtld_tls_init_tp_called attribute_hidden;
+
 /* Deallocate memory allocated with _dl_allocate_tls.  */
 extern void _dl_deallocate_tls (void *tcb, bool dealloc_tcb);
 rtld_hidden_proto (_dl_deallocate_tls)