* elf/tst-tls-dlinfo.c: New file.

* elf/Makefile (tests): Add it. ($(objpfx)tst-tls-dlinfo): Depend on $(libdl). ($(objpfx)tst-tls-dlinfo.out): Depend on $(objpfx)tst-tlsmod2.so. * dlfcn/dlfcn.h (RTLD_DI_PROFILENAME, RTLD_DI_PROFILEOUT): New enum values, reserve unsupported requested names used on Solaris. (RTLD_DI_TLS_MODID, RTLD_DI_TLS_DATA): New enum values. (RTLD_DI_MAX): Likewise. * dlfcn/dlinfo.c (dlinfo_doit): Handle RTLD_DI_TLS_MODID and RTLD_DI_TLS_DATA. * elf/dl-tls.c (_dl_tls_get_addr_soft): New function. * sysdeps/generic/ldsodefs.h: Declare it. * elf/Versions (ld: GLIBC_PRIVATE): Add it. * elf/link.h (struct dl_phdr_info): New members dlpi_tls_modid, dlpi_tls_data. * elf/dl-iteratephdr.c (__dl_iterate_phdr): Fill them in. * include/link.h: Don't copy contents from elf/link.h. Instead, #include it while #define'ing around link_map. * elf/dl-debug.c (_dl_debug_initialize): Add a cast. Add bogus extern decl to verify link_map members. * elf/loadtest.c (MAPS): New macro, cast _r_debug._r_map. (OUT, main): Use it in place of _r_debug._r_map. * elf/unload.c: Likewise. * elf/unload2.c: Likewise. * elf/neededtest.c (check_loaded_objects): Likewise. * elf/neededtest2.c (check_loaded_objects): Likewise. * elf/neededtest3.c (check_loaded_objects): Likewise. * elf/neededtest4.c (check_loaded_objects): Likewise. * elf/circleload1.c (check_loaded_objects): Likewise.
git-mirror · Mar 1, 2006 · d78efd9 · d78efd9
1 parent 0b890d5
commit d78efd9
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diff --git a/ChangeLog b/ChangeLog
@@ -1,5 +1,38 @@
 2006-02-28  Roland McGrath  <roland@redhat.com>
 
+	* elf/tst-tls-dlinfo.c: New file.
+	* elf/Makefile (tests): Add it.
+	($(objpfx)tst-tls-dlinfo): Depend on $(libdl).
+	($(objpfx)tst-tls-dlinfo.out): Depend on $(objpfx)tst-tlsmod2.so.
+
+	* dlfcn/dlfcn.h (RTLD_DI_PROFILENAME, RTLD_DI_PROFILEOUT): New enum
+	values, reserve unsupported requested names used on Solaris.
+	(RTLD_DI_TLS_MODID, RTLD_DI_TLS_DATA): New enum values.
+	(RTLD_DI_MAX): Likewise.
+	* dlfcn/dlinfo.c (dlinfo_doit): Handle RTLD_DI_TLS_MODID and
+	RTLD_DI_TLS_DATA.
+
+	* elf/dl-tls.c (_dl_tls_get_addr_soft): New function.
+	* sysdeps/generic/ldsodefs.h: Declare it.
+	* elf/Versions (ld: GLIBC_PRIVATE): Add it.
+	* elf/link.h (struct dl_phdr_info): New members dlpi_tls_modid,
+	dlpi_tls_data.
+	* elf/dl-iteratephdr.c (__dl_iterate_phdr): Fill them in.
+
+	* include/link.h: Don't copy contents from elf/link.h.
+	Instead, #include it while #define'ing around link_map.
+	* elf/dl-debug.c (_dl_debug_initialize): Add a cast.
+	Add bogus extern decl to verify link_map members.
+	* elf/loadtest.c (MAPS): New macro, cast _r_debug._r_map.
+	(OUT, main): Use it in place of _r_debug._r_map.
+	* elf/unload.c: Likewise.
+	* elf/unload2.c: Likewise.
+	* elf/neededtest.c (check_loaded_objects): Likewise.
+	* elf/neededtest2.c (check_loaded_objects): Likewise.
+	* elf/neededtest3.c (check_loaded_objects): Likewise.
+	* elf/neededtest4.c (check_loaded_objects): Likewise.
+	* elf/circleload1.c (check_loaded_objects): Likewise.
+
 	* nscd/nscd_helper.c: Include <time.h> for `time' declaration.
 
 	* include/fcntl.h: Declare __openat, __open64.  Use libc_hidden_proto.

diff --git a/dlfcn/dlfcn.h b/dlfcn/dlfcn.h
@@ -1,5 +1,6 @@
 /* User functions for run-time dynamic loading.
-   Copyright (C) 1995-1999,2000,2001,2003,2004 Free Software Foundation, Inc.
+   Copyright (C) 1995-1999,2000,2001,2003,2004,2006
+	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
@@ -135,6 +136,8 @@ enum
        store the `struct link_map *' for HANDLE there.  */
     RTLD_DI_LINKMAP = 2,
 
+    RTLD_DI_CONFIGADDR = 3,	/* Unsupported, defined by Solaris.  */
+
     /* Treat ARG as `Dl_serinfo *' (see below), and fill in to describe the
        directories that will be searched for dependencies of this object.
        RTLD_DI_SERINFOSIZE fills in just the `dls_cnt' and `dls_size'
@@ -147,7 +150,21 @@ enum
        expand $ORIGIN in this shared object's dependency file names.  */
     RTLD_DI_ORIGIN = 6,
 
-    RTLD_DI_CONFIGADDR = 3	/* Unsupported, defined by Solaris.  */
+    RTLD_DI_PROFILENAME = 7,	/* Unsupported, defined by Solaris.  */
+    RTLD_DI_PROFILEOUT = 8,	/* Unsupported, defined by Solaris.  */
+
+    /* Treat ARG as `size_t *', and store there the TLS module ID
+       of this object's PT_TLS segment, as used in TLS relocations;
+       store zero if this object does not define a PT_TLS segment.  */
+    RTLD_DI_TLS_MODID = 9,
+
+    /* Treat ARG as `void **', and store there a pointer to the calling
+       thread's TLS block corresponding to this object's PT_TLS segment.
+       Store a null pointer if this object does not define a PT_TLS
+       segment, or if the calling thread has not allocated a block for it.  */
+    RTLD_DI_TLS_DATA = 10,
+
+    RTLD_DI_MAX = 10,
   };
 
 

diff --git a/dlfcn/dlinfo.c b/dlfcn/dlinfo.c
@@ -1,5 +1,5 @@
 /* dlinfo -- Get information from the dynamic linker.
-   Copyright (C) 2003, 2004 Free Software Foundation, Inc.
+   Copyright (C) 2003, 2004, 2006 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
@@ -32,6 +32,10 @@ dlinfo (void *handle, int request, void *arg)
 
 #else
 
+# ifdef USE_TLS
+#  include <dl-tls.h>
+# endif
+
 struct dlinfo_args
 {
   ElfW(Addr) caller;
@@ -90,6 +94,24 @@ RTLD_SELF used in code not dynamically loaded"));
     case RTLD_DI_ORIGIN:
       strcpy (args->arg, l->l_origin);
       break;
+
+    case RTLD_DI_TLS_MODID:
+      *(size_t *) args->arg = 0;
+#ifdef USE_TLS
+      *(size_t *) args->arg = l->l_tls_modid;
+#endif
+      break;
+
+    case RTLD_DI_TLS_DATA:
+      {
+	void *data = NULL;
+#ifdef USE_TLS
+	if (l->l_tls_modid != 0)
+	  data = _dl_tls_get_addr_soft (l);
+#endif
+	*(void **) args->arg = data;
+	break;
+      }
     }
 }
 

diff --git a/elf/Makefile b/elf/Makefile
@@ -163,9 +163,11 @@ tests += loadtest restest1 preloadtest loadfail multiload origtest resolvfail \
 	 neededtest3 neededtest4 unload2 lateglobal initfirst global \
 	 restest2 next dblload dblunload reldep5 reldep6 reldep7 reldep8 \
 	 circleload1 tst-tls3 tst-tls4 tst-tls5 tst-tls6 tst-tls7 tst-tls8 \
-	 tst-tls10 tst-tls11 tst-tls12 tst-tls13 tst-tls14 tst-tls15 tst-align \
-	 tst-align2 $(tests-execstack-$(have-z-execstack)) tst-dlmodcount \
-	 tst-dlopenrpath tst-deep1 tst-dlmopen1 tst-dlmopen2 tst-dlmopen3 \
+	 tst-tls10 tst-tls11 tst-tls12 tst-tls13 tst-tls14 tst-tls15 \
+	 tst-tls-dlinfo \
+	 tst-align tst-align2 $(tests-execstack-$(have-z-execstack)) \
+	 tst-dlmodcount tst-dlopenrpath tst-deep1 \
+	 tst-dlmopen1 tst-dlmopen2 tst-dlmopen3 \
 	 unload3 unload4 unload5 unload6 tst-audit1 tst-global1 order2 \
 	 tst-stackguard1
 #	 reldep9
@@ -700,6 +702,11 @@ $(objpfx)tst-tls14.out: $(objpfx)tst-tlsmod14b.so
 $(objpfx)tst-tls15: $(libdl)
 $(objpfx)tst-tls15.out: $(objpfx)tst-tlsmod15a.so $(objpfx)tst-tlsmod15b.so
 
+$(objpfx)tst-tls-dlinfo: $(libdl)
+$(objpfx)tst-tls-dlinfo.out: $(objpfx)tst-tlsmod2.so
+
+
+
 CFLAGS-tst-align.c = $(stack-align-test-flags)
 CFLAGS-tst-align2.c = $(stack-align-test-flags)
 CFLAGS-tst-alignmod.c = $(stack-align-test-flags)

diff --git a/elf/Versions b/elf/Versions
@@ -57,6 +57,7 @@ ld {
     _dl_allocate_tls; _dl_deallocate_tls;
     _dl_get_tls_static_info; _dl_allocate_tls_init;
     _dl_tls_setup; _dl_rtld_di_serinfo;
+    _dl_tls_get_addr_soft;
     _dl_make_stack_executable;
     # Only here for gdb while a better method is developed.
     _dl_debug_state;

diff --git a/elf/circleload1.c b/elf/circleload1.c
@@ -5,6 +5,8 @@
 #include <stdlib.h>
 #include <string.h>
 
+#define MAPS ((struct link_map *) _r_debug.r_map)
+
 static int
 check_loaded_objects (const char **loaded)
 {
@@ -24,7 +26,7 @@ check_loaded_objects (const char **loaded)
 
   printf("   Name\n");
   printf(" --------------------------------------------------------\n");
-  for (lm = _r_debug.r_map; lm; lm = lm->l_next)
+  for (lm = MAPS; lm; lm = lm->l_next)
     {
       if (lm->l_name && lm->l_name[0])
 	printf(" %s, count = %d\n", lm->l_name, (int) lm->l_direct_opencount);

diff --git a/elf/dl-debug.c b/elf/dl-debug.c
@@ -1,5 +1,6 @@
 /* Communicate dynamic linker state to the debugger at runtime.
-   Copyright (C) 1996, 1998,2000,2002,2004,2005 Free Software Foundation, Inc.
+   Copyright (C) 1996, 1998,2000,2002,2004,2005,2006
+	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
@@ -19,6 +20,18 @@
 
 #include <ldsodefs.h>
 
+
+/* These are the members in the public `struct link_map' type.
+   Sanity check that the internal type and the public type match.  */
+#define VERIFY_MEMBER(name) \
+  (offsetof (struct link_map_public, name) == offsetof (struct link_map, name))
+extern const int verify_link_map_members[(VERIFY_MEMBER (l_addr)
+					  && VERIFY_MEMBER (l_name)
+					  && VERIFY_MEMBER (l_ld)
+					  && VERIFY_MEMBER (l_next)
+					  && VERIFY_MEMBER (l_prev))
+					 ? 1 : -1];
+
 /* This structure communicates dl state to the debugger.  The debugger
    normally finds it via the DT_DEBUG entry in the dynamic section, but in
    a statically-linked program there is no dynamic section for the debugger
@@ -46,7 +59,7 @@ _dl_debug_initialize (ElfW(Addr) ldbase, Lmid_t ns)
       /* Tell the debugger where to find the map of loaded objects.  */
       r->r_version = 1	/* R_DEBUG_VERSION XXX */;
       r->r_ldbase = ldbase ?: _r_debug.r_ldbase;
-      r->r_map = GL(dl_ns)[ns]._ns_loaded;
+      r->r_map = (void *) GL(dl_ns)[ns]._ns_loaded;
       r->r_brk = (ElfW(Addr)) &_dl_debug_state;
     }
 

diff --git a/elf/dl-iteratephdr.c b/elf/dl-iteratephdr.c
@@ -1,5 +1,5 @@
 /* Get loaded objects program headers.
-   Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+   Copyright (C) 2001,2002,2003,2004,2006 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Jakub Jelinek <jakub@redhat.com>, 2001.
 
@@ -68,6 +68,13 @@ __dl_iterate_phdr (int (*callback) (struct dl_phdr_info *info,
       info.dlpi_phnum = l->l_phnum;
       info.dlpi_adds = GL(dl_load_adds);
       info.dlpi_subs = GL(dl_load_adds) - nloaded;
+      info.dlpi_tls_modid = 0;
+      info.dlpi_tls_data = NULL;
+#ifdef USE_TLS
+      info.dlpi_tls_modid = l->l_tls_modid;
+      if (info.dlpi_tls_modid != 0)
+	info.dlpi_tls_data = _dl_tls_get_addr_soft (l);
+#endif
       ret = callback (&info, sizeof (struct dl_phdr_info), data);
       if (ret)
 	break;

diff --git a/elf/dl-tls.c b/elf/dl-tls.c
@@ -1,5 +1,5 @@
 /* Thread-local storage handling in the ELF dynamic linker.  Generic version.
-   Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2002,2003,2004,2005,2006 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
@@ -735,9 +735,53 @@ __tls_get_addr (GET_ADDR_ARGS)
 # endif
 
 
+/* Look up the module's TLS block as for __tls_get_addr,
+   but never touch anything.  Return null if it's not allocated yet.  */
+void *
+internal_function
+_dl_tls_get_addr_soft (struct link_map *l)
+{
+  if (__builtin_expect (l->l_tls_modid == 0, 0))
+    /* This module has no TLS segment.  */
+    return NULL;
+
+  dtv_t *dtv = THREAD_DTV ();
+  if (__builtin_expect (dtv[0].counter != GL(dl_tls_generation), 0))
+    {
+      /* This thread's DTV is not completely current,
+	 but it might already cover this module.  */
+
+      if (l->l_tls_modid >= dtv[-1].counter)
+	/* Nope.  */
+	return NULL;
+
+      size_t idx = l->l_tls_modid;
+      struct dtv_slotinfo_list *listp = GL(dl_tls_dtv_slotinfo_list);
+      while (idx >= listp->len)
+	{
+	  idx -= listp->len;
+	  listp = listp->next;
+	}
+
+      /* We've reached the slot for this module.
+	 If its generation counter is higher than the DTV's,
+	 this thread does not know about this module yet.  */
+      if (dtv[0].counter < listp->slotinfo[idx].gen)
+	return NULL;
+    }
+
+  void *data = dtv[l->l_tls_modid].pointer.val;
+  if (__builtin_expect (data == TLS_DTV_UNALLOCATED, 0))
+    /* The DTV is current, but this thread has not yet needed
+       to allocate this module's segment.  */
+    data = NULL;
+
+  return data;
+}
+
 
 void
-_dl_add_to_slotinfo (struct link_map  *l)
+_dl_add_to_slotinfo (struct link_map *l)
 {
   /* Now that we know the object is loaded successfully add
      modules containing TLS data to the dtv info table.  We

diff --git a/elf/link.h b/elf/link.h
@@ -1,6 +1,6 @@
 /* Data structure for communication from the run-time dynamic linker for
    loaded ELF shared objects.
-   Copyright (C) 1995-2001, 2004, 2005 Free Software Foundation, Inc.
+   Copyright (C) 1995-2001, 2004, 2005, 2006 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
@@ -135,23 +135,31 @@ enum
 				   la_symbind call.  */
   };
 
-
 struct dl_phdr_info
   {
     ElfW(Addr) dlpi_addr;
     const char *dlpi_name;
     const ElfW(Phdr) *dlpi_phdr;
     ElfW(Half) dlpi_phnum;
 
-    /* Note: the next two members were introduced after the first
+    /* Note: Following members were introduced after the first
        version of this structure was available.  Check the SIZE
-       argument passed to the dl_iterate_phdr() callback to determine
-       whether or not they are provided.  */
+       argument passed to the dl_iterate_phdr callback to determine
+       whether or not each later member is available.  */
 
     /* Incremented when a new object may have been added.  */
     unsigned long long int dlpi_adds;
     /* Incremented when an object may have been removed.  */
     unsigned long long int dlpi_subs;
+
+    /* If there is a PT_TLS segment, its module ID as used in
+       TLS relocations, else zero.  */
+    size_t dlpi_tls_modid;
+
+    /* The address of the calling thread's instance of this module's
+       PT_TLS segment, if it has one and it has been allocated
+       in the calling thread, otherwise a null pointer.  */
+    void *dlpi_tls_data;
   };
 
 __BEGIN_DECLS

diff --git a/elf/loadtest.c b/elf/loadtest.c
@@ -70,8 +70,10 @@ static const struct
 
 #include <include/link.h>
 
+#define MAPS ((struct link_map *) _r_debug.r_map)
+
 #define OUT \
-  for (map = _r_debug.r_map; map != NULL; map = map->l_next)		      \
+  for (map = MAPS; map != NULL; map = map->l_next)		      \
     if (map->l_type == lt_loaded)					      \
       printf ("name = \"%s\", direct_opencount = %d\n",			      \
 	      map->l_name, (int) map->l_direct_opencount);		      \
@@ -147,7 +149,7 @@ main (int argc, char *argv[])
 	    {
 	      /* In this case none of the objects above should be
 		 present.  */
-	      for (map = _r_debug.r_map; map != NULL; map = map->l_next)
+	      for (map = MAPS; map != NULL; map = map->l_next)
 		if (map->l_type == lt_loaded
 		    && (strstr (map->l_name, testobjs[0].name) != NULL
 			|| strstr (map->l_name, testobjs[1].name) != NULL
@@ -180,7 +182,7 @@ main (int argc, char *argv[])
       }
 
   /* Check whether all files are unloaded.  */
-  for (map = _r_debug.r_map; map != NULL; map = map->l_next)
+  for (map = MAPS; map != NULL; map = map->l_next)
     if (map->l_type == lt_loaded)
       {
 	printf ("name = \"%s\", direct_opencount = %d\n",

diff --git a/elf/neededtest.c b/elf/neededtest.c
@@ -5,6 +5,8 @@
 #include <stdlib.h>
 #include <string.h>
 
+#define MAPS ((struct link_map *) _r_debug.r_map)
+
 static int
 check_loaded_objects (const char **loaded)
 {
@@ -24,7 +26,7 @@ check_loaded_objects (const char **loaded)
 
   printf("   Name\n");
   printf(" --------------------------------------------------------\n");
-  for (lm = _r_debug.r_map; lm; lm = lm->l_next)
+  for (lm = MAPS; lm; lm = lm->l_next)
     {
       if (lm->l_name && lm->l_name[0])
 	printf(" %s, count = %d\n", lm->l_name, (int) lm->l_direct_opencount);