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Fix DTV race, assert, DTV_SURPLUS Static TLS limit, and nptl_db garbage
for ChangeLog [BZ #17090] [BZ #17620] [BZ #17621] [BZ #17628] * NEWS: Update. * elf/dl-tls.c (_dl_update_slotinfo): Clean up outdated DTV entries with Static TLS too. Skip entries past the end of the allocated DTV, from Alan Modra. (tls_get_addr_tail): Update to glibc_likely/unlikely. Move Static TLS DTV entry set up from... (_dl_allocate_tls_init): ... here (fix modid assertion), ... * elf/dl-reloc.c (_dl_nothread_init_static_tls): ... here... * nptl/allocatestack.c (init_one_static_tls): ... and here... * elf/dlopen.c (dl_open_worker): Drop l_tls_modid upper bound for Static TLS. * elf/tlsdeschtab.h (map_generation): Return size_t. Check that the slot we find is associated with the given map before using its generation count. * nptl_db/db_info.c: Include ldsodefs.h. (rtld_global, dtv_slotinfo_list, dtv_slotinfo): New typedefs. * nptl_db/structs.def (DB_RTLD_VARIABLE): New macro. (DB_MAIN_VARIABLE, DB_RTLD_GLOBAL_FIELD): Likewise. (link_map::l_tls_offset): New struct field. (dtv_t::counter): Likewise. (rtld_global): New struct. (_rtld_global): New rtld variable. (dl_tls_dtv_slotinfo_list): New rtld global field. (dtv_slotinfo_list): New struct. (dtv_slotinfo): Likewise. * nptl_db/td_symbol_list.c: Drop gnu/lib-names.h include. (td_lookup): Rename to... (td_mod_lookup): ... this. Use new mod parameter instead of LIBPTHREAD_SO. * nptl_db/td_thr_tlsbase.c: Include link.h. (dtv_slotinfo_list, dtv_slotinfo): New functions. (td_thr_tlsbase): Check DTV generation. Compute Static TLS addresses even if the DTV is out of date or missing them. * nptl_db/fetch-value.c (_td_locate_field): Do not refuse to index zero-length arrays. * nptl_db/thread_dbP.h: Include gnu/lib-names.h. (td_lookup): Make it a macro implemented in terms of... (td_mod_lookup): ... this declaration. * nptl_db/db-symbols.awk (DB_RTLD_VARIABLE): Override. (DB_MAIN_VARIABLE): Likewise.
This commit is contained in:
Alexandre Oliva
parent
b97eb2bdb1
commit
f8aeae3473
47
ChangeLog
47
ChangeLog
@ -1,3 +1,50 @@
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2015-03-17 Alexandre Oliva <aoliva@redhat.com>
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[BZ #17090]
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[BZ #17620]
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[BZ #17621]
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[BZ #17628]
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* NEWS: Update.
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* elf/dl-tls.c (_dl_update_slotinfo): Clean up outdated DTV
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entries with Static TLS too. Skip entries past the end of the
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allocated DTV, from Alan Modra.
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(tls_get_addr_tail): Update to glibc_likely/unlikely. Move
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Static TLS DTV entry set up from...
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(_dl_allocate_tls_init): ... here (fix modid assertion), ...
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* elf/dl-reloc.c (_dl_nothread_init_static_tls): ... here...
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* nptl/allocatestack.c (init_one_static_tls): ... and here...
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* elf/dlopen.c (dl_open_worker): Drop l_tls_modid upper bound
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for Static TLS.
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* elf/tlsdeschtab.h (map_generation): Return size_t. Check
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that the slot we find is associated with the given map before
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using its generation count.
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* nptl_db/db_info.c: Include ldsodefs.h.
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(rtld_global, dtv_slotinfo_list, dtv_slotinfo): New typedefs.
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* nptl_db/structs.def (DB_RTLD_VARIABLE): New macro.
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(DB_MAIN_VARIABLE, DB_RTLD_GLOBAL_FIELD): Likewise.
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(link_map::l_tls_offset): New struct field.
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(dtv_t::counter): Likewise.
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(rtld_global): New struct.
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(_rtld_global): New rtld variable.
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(dl_tls_dtv_slotinfo_list): New rtld global field.
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(dtv_slotinfo_list): New struct.
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(dtv_slotinfo): Likewise.
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* nptl_db/td_symbol_list.c: Drop gnu/lib-names.h include.
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(td_lookup): Rename to...
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(td_mod_lookup): ... this. Use new mod parameter instead of
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LIBPTHREAD_SO.
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* nptl_db/td_thr_tlsbase.c: Include link.h.
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(dtv_slotinfo_list, dtv_slotinfo): New functions.
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(td_thr_tlsbase): Check DTV generation. Compute Static TLS
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addresses even if the DTV is out of date or missing them.
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* nptl_db/fetch-value.c (_td_locate_field): Do not refuse to
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index zero-length arrays.
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* nptl_db/thread_dbP.h: Include gnu/lib-names.h.
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(td_lookup): Make it a macro implemented in terms of...
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(td_mod_lookup): ... this declaration.
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* nptl_db/db-symbols.awk (DB_RTLD_VARIABLE): Override.
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(DB_MAIN_VARIABLE): Likewise.
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2015-03-16 H.J. Lu <hongjiu.lu@intel.com>
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[BZ #18134]
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11
NEWS
11
NEWS
@ -10,11 +10,12 @@ Version 2.22
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* The following bugs are resolved with this release:
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4719, 13064, 14094, 14841, 14906, 15319, 15467, 15790, 15969, 16351,
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16512, 16560, 16783, 17269, 17523, 17569, 17588, 17631, 17711, 17776,
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17779, 17792, 17836, 17912, 17916, 17932, 17944, 17949, 17964, 17965,
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17967, 17969, 17978, 17987, 17991, 17996, 17998, 17999, 18019, 18020,
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18029, 18030, 18032, 18036, 18038, 18039, 18042, 18043, 18046, 18047,
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18068, 18080, 18093, 18104, 18110, 18111, 18128.
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16512, 16560, 16783, 17090, 17269, 17523, 17569, 17588, 17620, 17621,
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17628, 17631, 17711, 17776, 17779, 17792, 17836, 17912, 17916, 17932,
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17944, 17949, 17964, 17965, 17967, 17969, 17978, 17987, 17991, 17996,
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17998, 17999, 18019, 18020, 18029, 18030, 18032, 18036, 18038, 18039,
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18042, 18043, 18046, 18047, 18068, 18080, 18093, 18104, 18110, 18111,
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18128.
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* Character encoding and ctype tables were updated to Unicode 7.0.0, using
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new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
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@ -533,17 +533,7 @@ TLS generation counter wrapped! Please report this."));
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&& imap->l_tls_blocksize > 0)
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{
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/* For static TLS we have to allocate the memory here and
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now. This includes allocating memory in the DTV. But we
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cannot change any DTV other than our own. So, if we
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cannot guarantee that there is room in the DTV we don't
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even try it and fail the load.
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XXX We could track the minimum DTV slots allocated in
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all threads. */
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if (! RTLD_SINGLE_THREAD_P && imap->l_tls_modid > DTV_SURPLUS)
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_dl_signal_error (0, "dlopen", NULL, N_("\
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cannot load any more object with static TLS"));
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now, but we can delay updating the DTV. */
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imap->l_need_tls_init = 0;
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#ifdef SHARED
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/* Update the slot information data for at least the
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@ -137,12 +137,6 @@ _dl_nothread_init_static_tls (struct link_map *map)
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# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
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#endif
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/* Fill in the DTV slot so that a later LD/GD access will find it. */
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dtv_t *dtv = THREAD_DTV ();
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assert (map->l_tls_modid <= dtv[-1].counter);
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dtv[map->l_tls_modid].pointer.val = dest;
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dtv[map->l_tls_modid].pointer.is_static = true;
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/* Initialize the memory. */
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memset (__mempcpy (dest, map->l_tls_initimage, map->l_tls_initimage_size),
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'\0', map->l_tls_blocksize - map->l_tls_initimage_size);
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63
elf/dl-tls.c
63
elf/dl-tls.c
@ -493,17 +493,14 @@ _dl_allocate_tls_init (void *result)
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assert (listp->slotinfo[cnt].gen <= GL(dl_tls_generation));
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maxgen = MAX (maxgen, listp->slotinfo[cnt].gen);
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dtv[map->l_tls_modid].pointer.val = TLS_DTV_UNALLOCATED;
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dtv[map->l_tls_modid].pointer.is_static = false;
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if (map->l_tls_offset == NO_TLS_OFFSET
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|| map->l_tls_offset == FORCED_DYNAMIC_TLS_OFFSET)
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{
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/* For dynamically loaded modules we simply store
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the value indicating deferred allocation. */
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dtv[map->l_tls_modid].pointer.val = TLS_DTV_UNALLOCATED;
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dtv[map->l_tls_modid].pointer.is_static = false;
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continue;
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}
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continue;
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assert (map->l_tls_modid == cnt);
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assert (map->l_tls_modid == total + cnt);
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assert (map->l_tls_blocksize >= map->l_tls_initimage_size);
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#if TLS_TCB_AT_TP
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assert ((size_t) map->l_tls_offset >= map->l_tls_blocksize);
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@ -515,8 +512,6 @@ _dl_allocate_tls_init (void *result)
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#endif
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/* Copy the initialization image and clear the BSS part. */
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dtv[map->l_tls_modid].pointer.val = dest;
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dtv[map->l_tls_modid].pointer.is_static = true;
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memset (__mempcpy (dest, map->l_tls_initimage,
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map->l_tls_initimage_size), '\0',
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map->l_tls_blocksize - map->l_tls_initimage_size);
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@ -679,13 +674,16 @@ _dl_update_slotinfo (unsigned long int req_modid)
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struct link_map *map = listp->slotinfo[cnt].map;
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if (map == NULL)
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{
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/* If this modid was used at some point the memory
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might still be allocated. */
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if (! dtv[total + cnt].pointer.is_static
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&& dtv[total + cnt].pointer.val != TLS_DTV_UNALLOCATED)
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if (dtv[-1].counter >= total + cnt)
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{
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free (dtv[total + cnt].pointer.val);
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/* If this modid was used at some point the memory
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might still be allocated. */
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if (! dtv[total + cnt].pointer.is_static
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&& (dtv[total + cnt].pointer.val
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!= TLS_DTV_UNALLOCATED))
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free (dtv[total + cnt].pointer.val);
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dtv[total + cnt].pointer.val = TLS_DTV_UNALLOCATED;
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dtv[total + cnt].pointer.is_static = false;
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}
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continue;
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@ -718,10 +716,8 @@ _dl_update_slotinfo (unsigned long int req_modid)
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memalign and not malloc. */
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free (dtv[modid].pointer.val);
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/* This module is loaded dynamically- We defer memory
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allocation. */
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dtv[modid].pointer.is_static = false;
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dtv[modid].pointer.val = TLS_DTV_UNALLOCATED;
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dtv[modid].pointer.is_static = false;
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if (modid == req_modid)
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the_map = map;
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@ -759,13 +755,12 @@ tls_get_addr_tail (GET_ADDR_ARGS, dtv_t *dtv, struct link_map *the_map)
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the_map = listp->slotinfo[idx].map;
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}
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again:
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/* Make sure that, if a dlopen running in parallel forces the
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variable into static storage, we'll wait until the address in the
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static TLS block is set up, and use that. If we're undecided
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yet, make sure we make the decision holding the lock as well. */
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if (__builtin_expect (the_map->l_tls_offset
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!= FORCED_DYNAMIC_TLS_OFFSET, 0))
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if (__glibc_unlikely (the_map->l_tls_offset
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!= FORCED_DYNAMIC_TLS_OFFSET))
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{
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__rtld_lock_lock_recursive (GL(dl_load_lock));
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if (__glibc_likely (the_map->l_tls_offset == NO_TLS_OFFSET))
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@ -773,22 +768,28 @@ tls_get_addr_tail (GET_ADDR_ARGS, dtv_t *dtv, struct link_map *the_map)
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the_map->l_tls_offset = FORCED_DYNAMIC_TLS_OFFSET;
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__rtld_lock_unlock_recursive (GL(dl_load_lock));
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}
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else
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else if (__glibc_likely (the_map->l_tls_offset
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!= FORCED_DYNAMIC_TLS_OFFSET))
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{
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#if TLS_TCB_AT_TP
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void *p = (char *) THREAD_SELF - the_map->l_tls_offset;
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#elif TLS_DTV_AT_TP
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void *p = (char *) THREAD_SELF + the_map->l_tls_offset + TLS_PRE_TCB_SIZE;
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#else
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# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
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#endif
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__rtld_lock_unlock_recursive (GL(dl_load_lock));
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if (__builtin_expect (the_map->l_tls_offset
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!= FORCED_DYNAMIC_TLS_OFFSET, 1))
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{
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void *p = dtv[GET_ADDR_MODULE].pointer.val;
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if (__glibc_unlikely (p == TLS_DTV_UNALLOCATED))
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goto again;
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return (char *) p + GET_ADDR_OFFSET;
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}
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dtv[GET_ADDR_MODULE].pointer.is_static = true;
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dtv[GET_ADDR_MODULE].pointer.val = p;
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return (char *) p + GET_ADDR_OFFSET;
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}
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else
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__rtld_lock_unlock_recursive (GL(dl_load_lock));
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}
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void *p = dtv[GET_ADDR_MODULE].pointer.val = allocate_and_init (the_map);
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dtv[GET_ADDR_MODULE].pointer.is_static = false;
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assert (!dtv[GET_ADDR_MODULE].pointer.is_static);
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return (char *) p + GET_ADDR_OFFSET;
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}
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@ -42,7 +42,7 @@ eq_tlsdesc (void *p, void *q)
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return tdp->tlsinfo.ti_offset == tdq->tlsinfo.ti_offset;
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}
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inline static int
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inline static size_t
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map_generation (struct link_map *map)
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{
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size_t idx = map->l_tls_modid;
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@ -58,7 +58,7 @@ map_generation (struct link_map *map)
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we can assume that, if the generation count is zero, we
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still haven't determined the generation count for this
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module. */
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if (listp->slotinfo[idx].gen)
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if (listp->slotinfo[idx].map == map && listp->slotinfo[idx].gen)
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return listp->slotinfo[idx].gen;
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else
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break;
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@ -1190,7 +1190,6 @@ __nptl_setxid (struct xid_command *cmdp)
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static inline void __attribute__((always_inline))
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init_one_static_tls (struct pthread *curp, struct link_map *map)
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{
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dtv_t *dtv = GET_DTV (TLS_TPADJ (curp));
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# if TLS_TCB_AT_TP
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void *dest = (char *) curp - map->l_tls_offset;
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# elif TLS_DTV_AT_TP
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@ -1199,11 +1198,9 @@ init_one_static_tls (struct pthread *curp, struct link_map *map)
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# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
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# endif
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/* Fill in the DTV slot so that a later LD/GD access will find it. */
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dtv[map->l_tls_modid].pointer.val = dest;
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dtv[map->l_tls_modid].pointer.is_static = true;
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/* Initialize the memory. */
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/* We cannot delay the initialization of the Static TLS area, since
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it can be accessed with LE or IE, but since the DTV is only used
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by GD and LD, we can delay its update to avoid a race. */
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memset (__mempcpy (dest, map->l_tls_initimage, map->l_tls_initimage_size),
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'\0', map->l_tls_blocksize - map->l_tls_initimage_size);
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}
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@ -2,6 +2,8 @@
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# we've just built. It checks for all the symbols used in td_symbol_list.
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BEGIN {
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%define DB_RTLD_VARIABLE(name) /* Nothing. */
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%define DB_MAIN_VARIABLE(name) /* Nothing. */
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%define DB_LOOKUP_NAME(idx, name) required[STRINGIFY (name)] = 1;
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%define DB_LOOKUP_NAME_TH_UNIQUE(idx, name) th_unique[STRINGIFY (name)] = 1;
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%include "db-symbols.h"
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@ -21,6 +21,7 @@
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#include <stdint.h>
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#include "thread_dbP.h"
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#include <tls.h>
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#include <ldsodefs.h>
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typedef struct pthread pthread;
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typedef struct pthread_key_struct pthread_key_struct;
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@ -37,6 +38,9 @@ typedef struct
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} dtv;
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typedef struct link_map link_map;
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typedef struct rtld_global rtld_global;
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typedef struct dtv_slotinfo_list dtv_slotinfo_list;
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typedef struct dtv_slotinfo dtv_slotinfo;
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/* Actually static in nptl/init.c, but we only need it for typeof. */
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extern bool __nptl_initial_report_events;
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@ -69,7 +69,8 @@ _td_locate_field (td_thragent_t *ta,
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}
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}
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if (idx != 0 && idx - (psaddr_t) 0 > DB_DESC_NELEM (desc))
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if (idx != 0 && DB_DESC_NELEM (desc) != 0
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&& idx - (psaddr_t) 0 > DB_DESC_NELEM (desc))
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/* This is an internal indicator to callers with nonzero IDX
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that the IDX value is too big. */
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return TD_NOAPLIC;
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@ -22,6 +22,28 @@
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# define STRUCTS_DEF_DEFAULTS 1
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#endif
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#ifndef DB_RTLD_VARIABLE
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# define DB_RTLD_VARIABLE(name) DB_VARIABLE (name)
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#endif
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#ifndef DB_MAIN_VARIABLE
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# define DB_MAIN_VARIABLE(name) DB_VARIABLE (name)
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#endif
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#ifndef DB_RTLD_GLOBAL_FIELD
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# if !IS_IN (libpthread)
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# define DB_RTLD_GLOBAL_FIELD(field) \
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DB_STRUCT_FIELD (rtld_global, _##field) \
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DB_MAIN_VARIABLE (_##field)
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# elif defined SHARED
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# define DB_RTLD_GLOBAL_FIELD(field) \
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DB_STRUCT_FIELD (rtld_global, _##field)
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# else
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# define DB_RTLD_GLOBAL_FIELD(field) \
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DB_MAIN_VARIABLE (_##field)
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# endif
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#endif /* DB_RTLD_GLOBAL_FIELD */
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DB_STRUCT (pthread)
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DB_STRUCT_FIELD (pthread, list)
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DB_STRUCT_FIELD (pthread, report_events)
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@ -70,14 +92,31 @@ DB_STRUCT (pthread_key_data_level2)
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DB_STRUCT_ARRAY_FIELD (pthread_key_data_level2, data)
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DB_STRUCT_FIELD (link_map, l_tls_modid)
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DB_STRUCT_FIELD (link_map, l_tls_offset)
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DB_STRUCT_ARRAY_FIELD (dtv, dtv)
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#define pointer_val pointer.val /* Field of anonymous struct in dtv_t. */
|
||||
DB_STRUCT_FIELD (dtv_t, pointer_val)
|
||||
DB_STRUCT_FIELD (dtv_t, counter)
|
||||
#if !IS_IN (libpthread) || TLS_TCB_AT_TP
|
||||
DB_STRUCT_FIELD (pthread, dtvp)
|
||||
#endif
|
||||
|
||||
#if !(IS_IN (libpthread) && !defined SHARED)
|
||||
DB_STRUCT (rtld_global)
|
||||
DB_RTLD_VARIABLE (_rtld_global)
|
||||
#endif
|
||||
DB_RTLD_GLOBAL_FIELD (dl_tls_dtv_slotinfo_list)
|
||||
|
||||
DB_STRUCT (dtv_slotinfo_list)
|
||||
DB_STRUCT_FIELD (dtv_slotinfo_list, len)
|
||||
DB_STRUCT_FIELD (dtv_slotinfo_list, next)
|
||||
DB_STRUCT_ARRAY_FIELD (dtv_slotinfo_list, slotinfo)
|
||||
|
||||
DB_STRUCT (dtv_slotinfo)
|
||||
DB_STRUCT_FIELD (dtv_slotinfo, gen)
|
||||
DB_STRUCT_FIELD (dtv_slotinfo, map)
|
||||
|
||||
#ifdef STRUCTS_DEF_DEFAULTS
|
||||
# undef DB_STRUCT_ARRAY_FIELD
|
||||
# undef DB_ARRAY_VARIABLE
|
||||
|
||||
@ -18,7 +18,6 @@
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
#include <assert.h>
|
||||
#include <gnu/lib-names.h>
|
||||
#include "thread_dbP.h"
|
||||
|
||||
static const char *symbol_list_arr[] =
|
||||
@ -41,12 +40,12 @@ td_symbol_list (void)
|
||||
|
||||
|
||||
ps_err_e
|
||||
td_lookup (struct ps_prochandle *ps, int idx, psaddr_t *sym_addr)
|
||||
td_mod_lookup (struct ps_prochandle *ps, const char *mod,
|
||||
int idx, psaddr_t *sym_addr)
|
||||
{
|
||||
ps_err_e result;
|
||||
assert (idx >= 0 && idx < SYM_NUM_MESSAGES);
|
||||
result = ps_pglobal_lookup (ps, LIBPTHREAD_SO, symbol_list_arr[idx],
|
||||
sym_addr);
|
||||
result = ps_pglobal_lookup (ps, mod, symbol_list_arr[idx], sym_addr);
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
@ -17,14 +17,118 @@
|
||||
<http://www.gnu.org/licenses/>. */
|
||||
|
||||
#include "thread_dbP.h"
|
||||
#include <link.h>
|
||||
|
||||
/* Get the DTV slotinfo list head entry from the dynamic loader state
|
||||
into *LISTHEAD. */
|
||||
static td_err_e
|
||||
dtv_slotinfo_list (td_thragent_t *ta,
|
||||
psaddr_t *listhead)
|
||||
{
|
||||
td_err_e err;
|
||||
psaddr_t head;
|
||||
|
||||
if (ta->ta_addr__rtld_global == 0
|
||||
&& td_mod_lookup (ta->ph, LD_SO, SYM__rtld_global,
|
||||
&ta->ta_addr__rtld_global) != PS_OK)
|
||||
ta->ta_addr__rtld_global = (void*)-1;
|
||||
|
||||
if (ta->ta_addr__rtld_global != (void*)-1)
|
||||
{
|
||||
err = DB_GET_FIELD (head, ta, ta->ta_addr__rtld_global,
|
||||
rtld_global, _dl_tls_dtv_slotinfo_list, 0);
|
||||
if (err != TD_OK)
|
||||
return err;
|
||||
}
|
||||
else
|
||||
{
|
||||
if (ta->ta_addr__dl_tls_dtv_slotinfo_list == 0
|
||||
&& td_mod_lookup (ta->ph, NULL, SYM__dl_tls_dtv_slotinfo_list,
|
||||
&ta->ta_addr__dl_tls_dtv_slotinfo_list) != PS_OK)
|
||||
return TD_ERR;
|
||||
|
||||
err = _td_fetch_value (ta, ta->ta_var__dl_tls_dtv_slotinfo_list,
|
||||
SYM_DESC__dl_tls_dtv_slotinfo_list,
|
||||
0, ta->ta_addr__dl_tls_dtv_slotinfo_list, &head);
|
||||
if (err != TD_OK)
|
||||
return err;
|
||||
}
|
||||
|
||||
*listhead = head;
|
||||
return TD_OK;
|
||||
}
|
||||
|
||||
/* Get the address of the DTV slotinfo entry for MODID into
|
||||
*DTVSLOTINFO. */
|
||||
static td_err_e
|
||||
dtv_slotinfo (td_thragent_t *ta,
|
||||
unsigned long int modid,
|
||||
psaddr_t *dtvslotinfo)
|
||||
{
|
||||
td_err_e err;
|
||||
psaddr_t slot, temp;
|
||||
size_t slbase = 0;
|
||||
|
||||
err = dtv_slotinfo_list (ta, &slot);
|
||||
if (err != TD_OK)
|
||||
return err;
|
||||
|
||||
while (slot)
|
||||
{
|
||||
/* Get the number of entries in this list entry's array. */
|
||||
err = DB_GET_FIELD (temp, ta, slot, dtv_slotinfo_list, len, 0);
|
||||
if (err != TD_OK)
|
||||
return err;
|
||||
size_t len = (uintptr_t)temp;
|
||||
|
||||
/* Did we find the list entry for modid? */
|
||||
if (modid < slbase + len)
|
||||
break;
|
||||
|
||||
/* We didn't, so get the next list entry. */
|
||||
slbase += len;
|
||||
err = DB_GET_FIELD (temp, ta, slot, dtv_slotinfo_list,
|
||||
next, 0);
|
||||
if (err != TD_OK)
|
||||
return err;
|
||||
slot = temp;
|
||||
}
|
||||
|
||||
/* We reached the end of the list and found nothing. */
|
||||
if (!slot)
|
||||
return TD_ERR;
|
||||
|
||||
/* Take the slotinfo for modid from the list entry. */
|
||||
err = DB_GET_FIELD_ADDRESS (temp, ta, slot, dtv_slotinfo_list,
|
||||
slotinfo, modid - slbase);
|
||||
if (err != TD_OK)
|
||||
return err;
|
||||
slot = temp;
|
||||
|
||||
*dtvslotinfo = slot;
|
||||
return TD_OK;
|
||||
}
|
||||
|
||||
/* Return in *BASE the base address of the TLS block for MODID within
|
||||
TH.
|
||||
|
||||
It should return success and yield the correct pointer in any
|
||||
circumstance where the TLS block for the module and thread
|
||||
requested has already been initialized.
|
||||
|
||||
It should fail with TD_TLSDEFER only when the thread could not
|
||||
possibly have observed any values in that TLS block. That way, the
|
||||
debugger can fall back to showing initial values from the PT_TLS
|
||||
segment (and refusing attempts to mutate) for the TD_TLSDEFER case,
|
||||
and never fail to make the values the program will actually see
|
||||
available to the user of the debugger. */
|
||||
td_err_e
|
||||
td_thr_tlsbase (const td_thrhandle_t *th,
|
||||
unsigned long int modid,
|
||||
psaddr_t *base)
|
||||
{
|
||||
td_err_e err;
|
||||
psaddr_t dtv, dtvslot, dtvptr;
|
||||
psaddr_t dtv, dtvslot, dtvptr, temp;
|
||||
|
||||
if (modid < 1)
|
||||
return TD_NOTLS;
|
||||
@ -50,11 +154,75 @@ td_thr_tlsbase (const td_thrhandle_t *th,
|
||||
return TD_TLSDEFER;
|
||||
}
|
||||
|
||||
err = dtv_slotinfo (th->th_ta_p, modid, &temp);
|
||||
if (err != TD_OK)
|
||||
return err;
|
||||
|
||||
psaddr_t slot;
|
||||
err = DB_GET_STRUCT (slot, th->th_ta_p, temp, dtv_slotinfo);
|
||||
if (err != TD_OK)
|
||||
return err;
|
||||
|
||||
/* Take the link_map from the slotinfo. */
|
||||
psaddr_t map;
|
||||
err = DB_GET_FIELD_LOCAL (map, th->th_ta_p, slot, dtv_slotinfo, map, 0);
|
||||
if (err != TD_OK)
|
||||
return err;
|
||||
if (!map)
|
||||
return TD_ERR;
|
||||
|
||||
/* Ok, the modid is good, now find out what DTV generation it
|
||||
requires. */
|
||||
err = DB_GET_FIELD_LOCAL (temp, th->th_ta_p, slot, dtv_slotinfo, gen, 0);
|
||||
if (err != TD_OK)
|
||||
return err;
|
||||
size_t modgen = (uintptr_t)temp;
|
||||
|
||||
/* Get the DTV pointer from the thread descriptor. */
|
||||
err = DB_GET_FIELD (dtv, th->th_ta_p, pd, pthread, dtvp, 0);
|
||||
if (err != TD_OK)
|
||||
return err;
|
||||
|
||||
psaddr_t dtvgenloc;
|
||||
/* Get the DTV generation count at dtv[0].counter. */
|
||||
err = DB_GET_FIELD_ADDRESS (dtvgenloc, th->th_ta_p, dtv, dtv, dtv, 0);
|
||||
if (err != TD_OK)
|
||||
return err;
|
||||
err = DB_GET_FIELD (temp, th->th_ta_p, dtvgenloc, dtv_t, counter, 0);
|
||||
if (err != TD_OK)
|
||||
return err;
|
||||
size_t dtvgen = (uintptr_t)temp;
|
||||
|
||||
/* Is the DTV current enough? */
|
||||
if (dtvgen < modgen)
|
||||
{
|
||||
try_static_tls:
|
||||
/* If the module uses Static TLS, we're still good. */
|
||||
err = DB_GET_FIELD (temp, th->th_ta_p, map, link_map, l_tls_offset, 0);
|
||||
if (err != TD_OK)
|
||||
return err;
|
||||
ptrdiff_t tlsoff = (uintptr_t)temp;
|
||||
|
||||
if (tlsoff != FORCED_DYNAMIC_TLS_OFFSET
|
||||
&& tlsoff != NO_TLS_OFFSET)
|
||||
{
|
||||
psaddr_t tp = pd;
|
||||
|
||||
#if TLS_TCB_AT_TP
|
||||
dtvptr = tp - tlsoff;
|
||||
#elif TLS_DTV_AT_TP
|
||||
dtvptr = tp + tlsoff + TLS_PRE_TCB_SIZE;
|
||||
#else
|
||||
# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
|
||||
#endif
|
||||
|
||||
*base = dtvptr;
|
||||
return TD_OK;
|
||||
}
|
||||
|
||||
return TD_TLSDEFER;
|
||||
}
|
||||
|
||||
/* Find the corresponding entry in the DTV. */
|
||||
err = DB_GET_FIELD_ADDRESS (dtvslot, th->th_ta_p, dtv, dtv, dtv, modid);
|
||||
if (err != TD_OK)
|
||||
@ -68,7 +236,7 @@ td_thr_tlsbase (const td_thrhandle_t *th,
|
||||
/* It could be that the memory for this module is not allocated for
|
||||
the given thread. */
|
||||
if ((uintptr_t) dtvptr & 1)
|
||||
return TD_TLSDEFER;
|
||||
goto try_static_tls;
|
||||
|
||||
*base = dtvptr;
|
||||
return TD_OK;
|
||||
|
||||
@ -29,6 +29,7 @@
|
||||
#include "thread_db.h"
|
||||
#include "../nptl/pthreadP.h" /* This is for *_BITMASK only. */
|
||||
#include <list.h>
|
||||
#include <gnu/lib-names.h>
|
||||
|
||||
/* Indeces for the symbol names. */
|
||||
enum
|
||||
@ -139,11 +140,11 @@ ta_ok (const td_thragent_t *ta)
|
||||
}
|
||||
|
||||
|
||||
/* Internal wrapper around ps_pglobal_lookup. */
|
||||
extern ps_err_e td_lookup (struct ps_prochandle *ps,
|
||||
int idx, psaddr_t *sym_addr) attribute_hidden;
|
||||
|
||||
|
||||
/* Internal wrappers around ps_pglobal_lookup. */
|
||||
extern ps_err_e td_mod_lookup (struct ps_prochandle *ps, const char *modname,
|
||||
int idx, psaddr_t *sym_addr) attribute_hidden;
|
||||
#define td_lookup(ps, idx, sym_addr) \
|
||||
td_mod_lookup ((ps), LIBPTHREAD_SO, (idx), (sym_addr))
|
||||
|
||||
|
||||
/* Store in psaddr_t VAR the address of inferior's symbol NAME. */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user