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llvm / scudo / 1a25cfeb35b49e140636a3f065271d6ff7e662d8
commit1a25cfeb35b49e140636a3f065271d6ff7e662d8[log] [tgz]
authorPeter Collingbourne <peter@pcc.me.uk>Wed Sep 09 15:15:46 2020 -0700
committerCopybara-Service <copybara-worker@google.com>Wed Sep 16 17:09:31 2020 -0700
tree2ffa28a69c9ef3950c048e173be68809b78b5831
parenta8fa4b1487b0ee8fc645d2e5b9c2c318d8c87e07 [diff]
scudo: Introduce a new mechanism to let Scudo access a platform-specific TLS slot

An upcoming change to Scudo will change how we use the TLS slot
in tsd_shared.h, which will be a little easier to deal with if
we can remove the code path that calls pthread_getspecific and
pthread_setspecific. The only known user of this code path is Fuchsia.

We can't eliminate this code path by making Fuchsia use ELF TLS
because although Fuchsia supports ELF TLS, it is not supported within
libc itself. To address this, Roland McGrath on the Fuchsia team has
proposed that Scudo will optionally call a platform-provided function
to access a TLS slot reserved for Scudo. Android also has a reserved
TLS slot, but the code that accesses the TLS slot lives in Scudo.

We can eliminate some complexity and duplicated code by having Android
use the same mechanism that was proposed for Fuchsia, which is what
this change does. A separate change to Android implements it.

Differential Revision: https://reviews.llvm.org/D87420

GitOrigin-RevId: 84c2c4977dfe89112fd564a69c693d271663229c
2 files changed
tree: 2ffa28a69c9ef3950c048e173be68809b78b5831
  1. benchmarks/
  2. fuzz/
  3. include/
  4. tests/
  5. tools/
  6. allocator_config.h
  7. atomic_helpers.h
  8. bytemap.h
  9. checksum.cpp
  10. checksum.h
  11. chunk.h
  12. combined.h
  13. common.cpp
  14. common.h
  15. crc32_hw.cpp
  16. flags.cpp
  17. flags.h
  18. flags.inc
  19. flags_parser.cpp
  20. flags_parser.h
  21. fuchsia.cpp
  22. fuchsia.h
  23. internal_defs.h
  24. LICENSE.TXT
  25. linux.cpp
  26. linux.h
  27. list.h
  28. local_cache.h
  29. memtag.h
  30. mutex.h
  31. platform.h
  32. primary32.h
  33. primary64.h
  34. quarantine.h
  35. release.cpp
  36. release.h
  37. report.cpp
  38. report.h
  39. secondary.h
  40. size_class_map.h
  41. stack_depot.h
  42. stats.h
  43. string_utils.cpp
  44. string_utils.h
  45. tsd.h
  46. tsd_exclusive.h
  47. tsd_shared.h
  48. vector.h
  49. wrappers_c.cpp
  50. wrappers_c.h
  51. wrappers_c.inc
  52. wrappers_c_bionic.cpp
  53. wrappers_c_checks.h
  54. wrappers_cpp.cpp