td_thr_tls_get_addr.c 2.3 KB

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  1. /* Get address of thread local variable.
  2. Copyright (C) 2002,2003 Free Software Foundation, Inc.
  3. This file is part of the GNU C Library.
  4. Contributed by Ulrich Drepper <drepper@cygnus.com>, 2002.
  5. The GNU C Library is free software; you can redistribute it and/or
  6. modify it under the terms of the GNU Lesser General Public
  7. License as published by the Free Software Foundation; either
  8. version 2.1 of the License, or (at your option) any later version.
  9. The GNU C Library is distributed in the hope that it will be useful,
  10. but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12. Lesser General Public License for more details.
  13. You should have received a copy of the GNU Lesser General Public
  14. License along with the GNU C Library; if not, write to the Free
  15. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  16. 02111-1307 USA. */
  17. #include <link.h>
  18. #include "thread_dbP.h"
  19. /* Value used for dtv entries for which the allocation is delayed. */
  20. # define TLS_DTV_UNALLOCATED ((void *) -1l)
  21. td_err_e
  22. td_thr_tls_get_addr (const td_thrhandle_t *th __attribute__ ((unused)),
  23. void *map_address __attribute__ ((unused)),
  24. size_t offset __attribute__ ((unused)),
  25. void **address __attribute__ ((unused)))
  26. {
  27. #ifdef USE_TLS
  28. size_t modid;
  29. union dtv pdtv, *dtvp;
  30. LOG ("td_thr_tls_get_addr");
  31. /* Get the DTV pointer from the thread descriptor. */
  32. if (ps_pdread (th->th_ta_p->ph,
  33. &((struct _pthread_descr_struct *) th->th_unique)->p_header.data.dtvp,
  34. &dtvp, sizeof dtvp) != PS_OK)
  35. return TD_ERR; /* XXX Other error value? */
  36. /* Read the module ID from the link_map. */
  37. if (ps_pdread (th->th_ta_p->ph,
  38. &((struct link_map *) map_address)->l_tls_modid,
  39. &modid, sizeof modid) != PS_OK)
  40. return TD_ERR; /* XXX Other error value? */
  41. /* Get the corresponding entry in the DTV. */
  42. if (ps_pdread (th->th_ta_p->ph, dtvp + modid,
  43. &pdtv, sizeof (union dtv)) != PS_OK)
  44. return TD_ERR; /* XXX Other error value? */
  45. /* It could be that the memory for this module is not allocated for
  46. the given thread. */
  47. if (pdtv.pointer == TLS_DTV_UNALLOCATED)
  48. /* There is not much we can do. */
  49. return TD_NOTALLOC;
  50. *address = (char *) pdtv.pointer + offset;
  51. return TD_OK;
  52. #else
  53. return TD_ERR;
  54. #endif
  55. }