[sanitizers] read/write page fault detection on mac.

Subscribers: kubabrecka

Differential Revision: http://reviews.llvm.org/D19495

llvm-svn: 267477

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc b/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
index 5fbb147..c2e3d7f 100644 (file)
--- a/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
@@ -500,7 +500,8 @@ void LogFullErrorReport(const char *buffer) {
 }
 
 SignalContext::WriteFlag SignalContext::GetWriteFlag(void *context) {
-  return UNKNOWN;  // FIXME: implement this.
+  ucontext_t *ucontext = static_cast<ucontext_t*>(context);
+  return ucontext->uc_mcontext->__es.__err & 2 /*T_PF_WRITE*/ ? WRITE : READ;
 }
 
 void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {

diff --git a/compiler-rt/test/asan/TestCases/Linux/segv_read_write.c b/compiler-rt/test/asan/TestCases/Posix/segv_read_write.c
similarity index 100%
rename from compiler-rt/test/asan/TestCases/Linux/segv_read_write.c
rename to compiler-rt/test/asan/TestCases/Posix/segv_read_write.c