Function to get address of thread local variable.

1 files changed, 62 insertions, 0 deletions

diff --git a/linuxthreads_db/td_thr_tls_get_addr.c b/linuxthreads_db/td_thr_tls_get_addr.c
new file mode 100644
index 0000000000..7e05070a33
--- /dev/null
+++ b/linuxthreads_db/td_thr_tls_get_addr.c
@@ -0,0 +1,62 @@
+/* Get address of thread local variable.
+   Copyright (C) 2002 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 2002.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+
+#include "link.h"
+#include "thread_dbP.h"
+#include "tls.h"
+
+/* Value used for dtv entries for which the allocation is delayed.  */
+# define TLS_DTV_UNALLOCATED	((void *) -1l)
+
+
+td_err_e
+td_thr_tls_get_addr (const td_thrhandle_t *th, struct link_map *map,
+		     size_t offset, void **address)
+{
+  struct _pthread_descr_struct pds;
+  size_t modid;
+  union dtv pdtv;
+
+  LOG ("td_thr_tls_get_addr");
+
+  /* Get the thread descriptor.  */
+  if (ps_pdread (th->th_ta_p->ph, th->th_unique, &pds,
+		 th->th_ta_p->sizeof_descr) != PS_OK)
+    return TD_ERR;	/* XXX Other error value?  */
+
+  /* The module ID.  */
+  modid = map->l_tls_modid;
+
+  /* Get the corresponding entry in the DTV.  */
+  if (ps_pdread (th->th_ta_p->ph, pds.p_header.data.dtvp + modid, &pdtv,
+		 sizeof (union dtv)) != PS_OK)
+    return TD_ERR;	/* XXX Other error value?  */
+
+  /* It could be that the memory for this module is not allocated for
+     the given thread.  */
+  if (pdtv.pointer == TLS_DTV_UNALLOCATED)
+    /* There is not much we can do.  */
+    return TD_NOTALLOC;
+
+  *address = (char *) pdtv.pointer + offset;
+
+  return TD_OK;
+}