[ASan] minor changes to swapcontext handling: don't clear shadow memory if context stack is too large
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@172727 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/asan/asan_linux.cc b/lib/asan/asan_linux.cc
index 3f9370e..1606ab2 100644
--- a/lib/asan/asan_linux.cc
+++ b/lib/asan/asan_linux.cc
@@ -120,20 +120,14 @@
}
#if !ASAN_ANDROID
-void ClearShadowMemoryForContext(void *context) {
+void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
ucontext_t *ucp = (ucontext_t*)context;
- uptr sp = (uptr)ucp->uc_stack.ss_sp;
- uptr size = ucp->uc_stack.ss_size;
- // Align to page size.
- uptr PageSize = GetPageSizeCached();
- uptr bottom = sp & ~(PageSize - 1);
- size += sp - bottom;
- size = RoundUpTo(size, PageSize);
- PoisonShadow(bottom, size, 0);
+ *stack = (uptr)ucp->uc_stack.ss_sp;
+ *ssize = ucp->uc_stack.ss_size;
}
#else
-void ClearShadowMemoryForContext(void *context) {
- UNIMPLEMENTED();
+void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
+ return UNIMPLEMENTED();
}
#endif