[PATCH] D21083: [sanitizer][esan] Add internal_sigaction_syscall

[Derek Bruening via llvm-commits]

bruening created this revision.
bruening added a reviewer: aizatsky.
bruening added subscribers: llvm-commits, eugenis, kcc, zhaoqin, vitalybuka.
Herald added subscribers: kubabrecka, srhines, danalbert, tberghammer.

Adds a version of sigaction that uses a raw system call, to avoid circular
dependencies and support calling sigaction prior to setting up
interceptors.  The new sigaction relies on an assembly sigreturn routine
for its restorer, which is Linux x86_64-only for now.

Uses the new sigaction to initialize the working set tool's shadow fault
handler prior to libc interceptor being set up.  This is required to
support instrumentation invoked during interceptor setup, which happens
with tcmalloc.

http://reviews.llvm.org/D21083

Files:
  lib/esan/esan.cpp
  lib/esan/esan_interceptors.cpp
  lib/esan/working_set.cpp
  lib/esan/working_set.h
  lib/sanitizer_common/CMakeLists.txt
  lib/sanitizer_common/sanitizer_linux.cc
  lib/sanitizer_common/sanitizer_linux.h
  lib/sanitizer_common/sanitizer_linux_x86_64.S

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