diff options
Diffstat (limited to 'elf/rtld.c')
| -rw-r--r-- | elf/rtld.c | 150 |
1 files changed, 79 insertions, 71 deletions
diff --git a/elf/rtld.c b/elf/rtld.c index 968b37040a..9ec250214b 100644 --- a/elf/rtld.c +++ b/elf/rtld.c @@ -1006,6 +1006,76 @@ of this helper program; chances are you did not intend to run this program.\n\ _dl_receive_error (print_missing_version, version_check_doit, &args); } +#ifdef USE_TLS + /* Now it is time to determine the layout of the static TLS block + and allocate it for the initial thread. Note that we always + allocate the static block, we never defer it even if no + DF_STATIC_TLS bit is set. The reason is that we know glibc will + use the static model. First add the dynamic linker to the list + if it also uses TLS. */ + if (GL(dl_rtld_map).l_tls_blocksize != 0) + /* Assign a module ID. */ + GL(dl_rtld_map).l_tls_modid = _dl_next_tls_modid (); + +# ifndef SHARED + /* If dynamic loading of modules with TLS is impossible we do not + have to initialize any of the TLS functionality unless any of the + initial modules uses TLS. */ + if (GL(dl_tls_max_dtv_idx) > 0) +# endif + { + struct link_map *l; + size_t nelem; + struct dtv_slotinfo *slotinfo; + + /* Number of elements in the static TLS block. */ + GL(dl_tls_static_nelem) = GL(dl_tls_max_dtv_idx); + + /* Allocate the array which contains the information about the + dtv slots. We allocate a few entries more than needed to + avoid the need for reallocation. */ + nelem = GL(dl_tls_max_dtv_idx) + 1 + TLS_SLOTINFO_SURPLUS; + + /* Allocate. */ + GL(dl_tls_dtv_slotinfo_list) = (struct dtv_slotinfo_list *) + malloc (sizeof (struct dtv_slotinfo_list) + + nelem * sizeof (struct dtv_slotinfo)); + /* No need to check the return value. If memory allocation failed + the program would have been terminated. */ + + slotinfo = memset (GL(dl_tls_dtv_slotinfo_list)->slotinfo, '\0', + nelem * sizeof (struct dtv_slotinfo)); + GL(dl_tls_dtv_slotinfo_list)->len = nelem; + GL(dl_tls_dtv_slotinfo_list)->next = NULL; + + /* Fill in the information from the loaded modules. */ + for (l = GL(dl_loaded), i = 0; l != NULL; l = l->l_next) + if (l->l_tls_blocksize != 0) + /* This is a module with TLS data. Store the map reference. + The generation counter is zero. */ + slotinfo[++i].map = l; + assert (i == GL(dl_tls_max_dtv_idx)); + + /* Computer the TLS offsets for the various blocks. We call this + function even if none of the modules available at startup time + uses TLS to initialize some variables. */ + _dl_determine_tlsoffset (); + + /* Construct the static TLS block and the dtv for the initial + thread. For some platforms this will include allocating memory + for the thread descriptor. The memory for the TLS block will + never be freed. It should be allocated accordingly. The dtv + array can be changed if dynamic loading requires it. */ + tcbp = INTUSE(_dl_allocate_tls) (); + if (tcbp == NULL) + _dl_fatal_printf ("\ +cannot allocate TLS data structures for inital thread"); + + /* And finally install it for the main thread. */ + TLS_INIT_TP (tcbp); + } +#endif + if (__builtin_expect (mode, normal) != normal) { /* We were run just to list the shared libraries. It is @@ -1032,7 +1102,7 @@ of this helper program; chances are you did not intend to run this program.\n\ } if (_dl_name_match_p (GL(dl_trace_prelink), l)) GL(dl_trace_prelink_map) = l; - _dl_printf ("\t%s => %s (0x%0*Zx, 0x%0*Zx)\n", + _dl_printf ("\t%s => %s (0x%0*Zx, 0x%0*Zx)", l->l_libname->name[0] ? l->l_libname->name : rtld_progname ?: "<main program>", l->l_name[0] ? l->l_name @@ -1041,6 +1111,14 @@ of this helper program; chances are you did not intend to run this program.\n\ l->l_map_start, (int) sizeof l->l_addr * 2, l->l_addr); +#ifdef USE_TLS + if (l->l_tls_modid) + _dl_printf (" TLS(0x%Zx, 0x%0*Zx)\n", l->l_tls_modid, + (int) sizeof l->l_tls_offset * 2, + l->l_tls_offset); + else +#endif + _dl_printf ("\n"); } } else @@ -1182,76 +1260,6 @@ of this helper program; chances are you did not intend to run this program.\n\ _exit (0); } -#ifdef USE_TLS - /* Now it is time to determine the layout of the static TLS block - and allocate it for the initial thread. Note that we always - allocate the static block, we never defer it even if no - DF_STATIC_TLS bit is set. The reason is that we know glibc will - use the static model. First add the dynamic linker to the list - if it also uses TLS. */ - if (GL(dl_rtld_map).l_tls_blocksize != 0) - /* Assign a module ID. */ - GL(dl_rtld_map).l_tls_modid = _dl_next_tls_modid (); - -# ifndef SHARED - /* If dynamic loading of modules with TLS is impossible we do not - have to initialize any of the TLS functionality unless any of the - initial modules uses TLS. */ - if (GL(dl_tls_max_dtv_idx) > 0) -# endif - { - struct link_map *l; - size_t nelem; - struct dtv_slotinfo *slotinfo; - - /* Number of elements in the static TLS block. */ - GL(dl_tls_static_nelem) = GL(dl_tls_max_dtv_idx); - - /* Allocate the array which contains the information about the - dtv slots. We allocate a few entries more than needed to - avoid the need for reallocation. */ - nelem = GL(dl_tls_max_dtv_idx) + 1 + TLS_SLOTINFO_SURPLUS; - - /* Allocate. */ - GL(dl_tls_dtv_slotinfo_list) = (struct dtv_slotinfo_list *) - malloc (sizeof (struct dtv_slotinfo_list) - + nelem * sizeof (struct dtv_slotinfo)); - /* No need to check the return value. If memory allocation failed - the program would have been terminated. */ - - slotinfo = memset (GL(dl_tls_dtv_slotinfo_list)->slotinfo, '\0', - nelem * sizeof (struct dtv_slotinfo)); - GL(dl_tls_dtv_slotinfo_list)->len = nelem; - GL(dl_tls_dtv_slotinfo_list)->next = NULL; - - /* Fill in the information from the loaded modules. */ - for (l = GL(dl_loaded), i = 0; l != NULL; l = l->l_next) - if (l->l_tls_blocksize != 0) - /* This is a module with TLS data. Store the map reference. - The generation counter is zero. */ - slotinfo[++i].map = l; - assert (i == GL(dl_tls_max_dtv_idx)); - - /* Computer the TLS offsets for the various blocks. We call this - function even if none of the modules available at startup time - uses TLS to initialize some variables. */ - _dl_determine_tlsoffset (); - - /* Construct the static TLS block and the dtv for the initial - thread. For some platforms this will include allocating memory - for the thread descriptor. The memory for the TLS block will - never be freed. It should be allocated accordingly. The dtv - array can be changed if dynamic loading requires it. */ - tcbp = INTUSE(_dl_allocate_tls) (); - if (tcbp == NULL) - _dl_fatal_printf ("\ -cannot allocate TLS data structures for inital thread"); - - /* And finally install it for the main thread. */ - TLS_INIT_TP (tcbp); - } -#endif - if (GL(dl_loaded)->l_info [ADDRIDX (DT_GNU_LIBLIST)] && ! __builtin_expect (GL(dl_profile) != NULL, 0)) { |