2003-03-15 Roland McGrath <roland@redhat.com>

	* thread_db.h (td_err_e): Add TD_NOTLS and TD_TLSDEFER.
	(td_thr_tlsbase): Declare it.
	* td_thr_tlsbase.c: New file.
	* Makefile (libthread_db-routines): Add it.
	* Versions (libthread_db: GLIBC_2.3.3): New set, add td_thr_tlsbase.
	* td_thr_tls_get_addr.c (td_thr_tls_get_addr): Use td_thr_tlsbase.

5 files changed, 88 insertions, 41 deletions

diff --git a/linuxthreads_db/Makefile b/linuxthreads_db/Makefile
index 1265a78..53e46f7 100644
--- a/linuxthreads_db/Makefile
+++ b/linuxthreads_db/Makefile
@@ -39,7 +39,8 @@ libthread_db-routines = td_init td_log td_ta_delete td_ta_get_nthreads      \
 			td_thr_event_enable td_thr_set_event 		    \
 			td_thr_clear_event td_thr_event_getmsg		    \
 			td_ta_set_event td_ta_event_getmsg		    \
-			td_ta_clear_event td_symbol_list td_thr_tls_get_addr
+			td_ta_clear_event td_symbol_list \
+			td_thr_tlsbase td_thr_tls_get_addr
 
 libthread_db-inhibit-o = $(filter-out .os,$(object-suffixes))
 
diff --git a/linuxthreads_db/Versions b/linuxthreads_db/Versions
index 4ca8042..063493c 100644
--- a/linuxthreads_db/Versions
+++ b/linuxthreads_db/Versions
@@ -18,4 +18,7 @@ libthread_db {
   GLIBC_2.3 {
     td_thr_tls_get_addr;
   }
+  GLIBC_2.3.3 {
+    td_thr_tlsbase;
+  }
 }
diff --git a/linuxthreads_db/td_thr_tls_get_addr.c b/linuxthreads_db/td_thr_tls_get_addr.c
index 223fa66..c900cac 100644
--- a/linuxthreads_db/td_thr_tls_get_addr.c
+++ b/linuxthreads_db/td_thr_tls_get_addr.c
@@ -18,14 +18,9 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#include <stddef.h>
 #include <link.h>
 #include "thread_dbP.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 __attribute__ ((unused)),
 		     void *map_address __attribute__ ((unused)),
@@ -33,44 +28,17 @@ td_thr_tls_get_addr (const td_thrhandle_t *th __attribute__ ((unused)),
 		     void **address __attribute__ ((unused)))
 {
 #if USE_TLS
-  size_t modid;
-  union dtv pdtv, *dtvp;
-
-  LOG ("td_thr_tls_get_addr");
-
-  psaddr_t dtvpp = th->th_unique;
-#if TLS_TCB_AT_TP
-  dtvpp += offsetof (struct _pthread_descr_struct, p_header.data.dtvp);
-#elif TLS_DTV_AT_TP
-  dtvpp += TLS_PRE_TCB_SIZE + offsetof (tcbhead_t, dtv);
-#else
-# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined."
-#endif
-
-  /* Get the DTV pointer from the thread descriptor.  */
-  if (ps_pdread (th->th_ta_p->ph, dtvpp, &dtvp, sizeof dtvp) != PS_OK)
-    return TD_ERR;	/* XXX Other error value?  */
-
   /* Read the module ID from the link_map.  */
+  size_t modid;
   if (ps_pdread (th->th_ta_p->ph,
 		 &((struct link_map *) map_address)->l_tls_modid,
 		 &modid, sizeof modid) != PS_OK)
     return TD_ERR;	/* XXX Other error value?  */
 
-  /* Get the corresponding entry in the DTV.  */
-  if (ps_pdread (th->th_ta_p->ph, 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;
+  td_err_e result = td_thr_tlsbase (th, modid, address);
+  if (result == TD_OK)
+    *address += offset;
+  return result;
 #else
   return TD_ERR;
 #endif
diff --git a/linuxthreads_db/td_thr_tlsbase.c b/linuxthreads_db/td_thr_tlsbase.c
new file mode 100644
index 0000000..bcf0653
--- /dev/null
+++ b/linuxthreads_db/td_thr_tlsbase.c
@@ -0,0 +1,67 @@
+/* Locate TLS data for a thread.
+   Copyright (C) 2003 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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 "thread_dbP.h"
+
+/* Value used for dtv entries for which the allocation is delayed.  */
+# define TLS_DTV_UNALLOCATED	((void *) -1l)
+
+td_err_e
+td_thr_tlsbase (const td_thrhandle_t *th,
+		unsigned long int modid,
+		psaddr_t *base)
+{
+  if (modid < 1)
+    return TD_NOTLS;
+
+#if USE_TLS
+  union dtv pdtv, *dtvp;
+
+  LOG ("td_thr_tlsbase");
+
+  psaddr_t dtvpp = th->th_unique;
+#if TLS_TCB_AT_TP
+  dtvpp += offsetof (struct _pthread_descr_struct, p_header.data.dtvp);
+#elif TLS_DTV_AT_TP
+  dtvpp += TLS_PRE_TCB_SIZE + offsetof (tcbhead_t, dtv);
+#else
+# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined."
+#endif
+
+  /* Get the DTV pointer from the thread descriptor.  */
+  if (ps_pdread (th->th_ta_p->ph, dtvpp, &dtvp, sizeof dtvp) != PS_OK)
+    return TD_ERR;	/* XXX Other error value?  */
+
+  /* Get the corresponding entry in the DTV.  */
+  if (ps_pdread (th->th_ta_p->ph, 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)
+    return TD_TLSDEFER;
+
+  *base = (char *) pdtv.pointer;
+
+  return TD_OK;
+#else
+  return TD_ERR;
+#endif
+}
diff --git a/linuxthreads_db/thread_db.h b/linuxthreads_db/thread_db.h
index f0d9aa7..c115399 100644
--- a/linuxthreads_db/thread_db.h
+++ b/linuxthreads_db/thread_db.h
@@ -1,4 +1,5 @@
-/* Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc.
+/* thread_db.h -- interface to libthread_db.so library for debugging -lpthread
+   Copyright (C) 1999,2001,2002,2003 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -52,8 +53,10 @@ typedef enum
   TD_MALLOC,	  /* Out of memory.  */
   TD_PARTIALREG,  /* Not entire register set was read or written.  */
   TD_NOXREGS,	  /* X register set not available for given thread.  */
-  TD_NOTALLOC,	  /* TLS memory not yet allocated.  */
-  TD_VERSION	  /* Version if libpthread and libthread_db do not match.  */
+  TD_TLSDEFER,	  /* Thread has not yet allocated TLS for given module.  */
+  TD_NOTALLOC = TD_TLSDEFER,
+  TD_VERSION,	  /* Version if libpthread and libthread_db do not match.  */
+  TD_NOTLS	  /* There is TLS segment in the given module.  */
 } td_err_e;
 
 
@@ -402,6 +405,11 @@ extern td_err_e td_thr_setxregs (const td_thrhandle_t *__th,
 				 const void *__addr);
 
 
+/* Get address of the given module's TLS storage area for the given thread.  */
+extern td_err_e td_thr_tlsbase (const td_thrhandle_t *__th,
+				unsigned long int __modid,
+				psaddr_t *__base);
+
 /* Get address of thread local variable.  */
 extern td_err_e td_thr_tls_get_addr (const td_thrhandle_t *__th,
 				     void *__map_address, size_t __offset,