This is needed for the hwasan_personality instrumentation I've added.
Backported from llvm-svn: 369721
libsanitizer/ChangeLog:
2019-11-05 Matthew Malcomson <matthew.malcom...@arm.com>
* hwasan/hwasan_exceptions.cpp: New file.
############### Attachment also inlined for ease of reply ###############
diff --git a/libsanitizer/hwasan/hwasan_exceptions.cpp
b/libsanitizer/hwasan/hwasan_exceptions.cpp
new file mode 100644
index
0000000000000000000000000000000000000000..57a1438064cd28bb609359a4c841acf78337ebc3
--- /dev/null
+++ b/libsanitizer/hwasan/hwasan_exceptions.cpp
@@ -0,0 +1,64 @@
+//===-- hwasan_exceptions.cpp
---------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of HWAddressSanitizer.
+//
+// HWAddressSanitizer runtime.
+//===----------------------------------------------------------------------===//
+
+#include "hwasan_poisoning.h"
+#include "sanitizer_common/sanitizer_common.h"
+
+#include <unwind.h>
+
+using namespace __hwasan;
+using namespace __sanitizer;
+
+typedef _Unwind_Reason_Code PersonalityFn(int version, _Unwind_Action actions,
+ uint64_t exception_class,
+ _Unwind_Exception* unwind_exception,
+ _Unwind_Context* context);
+
+// Pointers to the _Unwind_GetGR and _Unwind_GetCFA functions are passed in
+// instead of being called directly. This is to handle cases where the unwinder
+// is statically linked and the sanitizer runtime and the program are linked
+// against different unwinders. The _Unwind_Context data structure is opaque so
+// it may be incompatible between unwinders.
+typedef _Unwind_Word GetGRFn(_Unwind_Context* context, int index);
+typedef _Unwind_Word GetCFAFn(_Unwind_Context* context);
+
+extern "C" _Unwind_Reason_Code __hwasan_personality_wrapper(
+ int version, _Unwind_Action actions, uint64_t exception_class,
+ _Unwind_Exception* unwind_exception, _Unwind_Context* context,
+ PersonalityFn* real_personality, GetGRFn* get_gr, GetCFAFn* get_cfa) {
+ _Unwind_Reason_Code rc;
+ if (real_personality)
+ rc = real_personality(version, actions, exception_class, unwind_exception,
+ context);
+ else
+ rc = _URC_CONTINUE_UNWIND;
+
+ // We only untag frames without a landing pad because landing pads are
+ // responsible for untagging the stack themselves if they resume.
+ //
+ // Here we assume that the frame record appears after any locals. This is not
+ // required by AAPCS but is a requirement for HWASAN instrumented functions.
+ if ((actions & _UA_CLEANUP_PHASE) && rc == _URC_CONTINUE_UNWIND) {
+#if defined(__x86_64__)
+ uptr fp = get_gr(context, 6); // rbp
+#elif defined(__aarch64__)
+ uptr fp = get_gr(context, 29); // x29
+#else
+#error Unsupported architecture
+#endif
+ uptr sp = get_cfa(context);
+ TagMemory(sp, fp - sp, 0);
+ }
+
+ return rc;
+}
diff --git a/libsanitizer/hwasan/hwasan_exceptions.cpp
b/libsanitizer/hwasan/hwasan_exceptions.cpp
new file mode 100644
index
0000000000000000000000000000000000000000..57a1438064cd28bb609359a4c841acf78337ebc3
--- /dev/null
+++ b/libsanitizer/hwasan/hwasan_exceptions.cpp
@@ -0,0 +1,64 @@
+//===-- hwasan_exceptions.cpp
---------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of HWAddressSanitizer.
+//
+// HWAddressSanitizer runtime.
+//===----------------------------------------------------------------------===//
+
+#include "hwasan_poisoning.h"
+#include "sanitizer_common/sanitizer_common.h"
+
+#include <unwind.h>
+
+using namespace __hwasan;
+using namespace __sanitizer;
+
+typedef _Unwind_Reason_Code PersonalityFn(int version, _Unwind_Action actions,
+ uint64_t exception_class,
+ _Unwind_Exception* unwind_exception,
+ _Unwind_Context* context);
+
+// Pointers to the _Unwind_GetGR and _Unwind_GetCFA functions are passed in
+// instead of being called directly. This is to handle cases where the unwinder
+// is statically linked and the sanitizer runtime and the program are linked
+// against different unwinders. The _Unwind_Context data structure is opaque so
+// it may be incompatible between unwinders.
+typedef _Unwind_Word GetGRFn(_Unwind_Context* context, int index);
+typedef _Unwind_Word GetCFAFn(_Unwind_Context* context);
+
+extern "C" _Unwind_Reason_Code __hwasan_personality_wrapper(
+ int version, _Unwind_Action actions, uint64_t exception_class,
+ _Unwind_Exception* unwind_exception, _Unwind_Context* context,
+ PersonalityFn* real_personality, GetGRFn* get_gr, GetCFAFn* get_cfa) {
+ _Unwind_Reason_Code rc;
+ if (real_personality)
+ rc = real_personality(version, actions, exception_class, unwind_exception,
+ context);
+ else
+ rc = _URC_CONTINUE_UNWIND;
+
+ // We only untag frames without a landing pad because landing pads are
+ // responsible for untagging the stack themselves if they resume.
+ //
+ // Here we assume that the frame record appears after any locals. This is not
+ // required by AAPCS but is a requirement for HWASAN instrumented functions.
+ if ((actions & _UA_CLEANUP_PHASE) && rc == _URC_CONTINUE_UNWIND) {
+#if defined(__x86_64__)
+ uptr fp = get_gr(context, 6); // rbp
+#elif defined(__aarch64__)
+ uptr fp = get_gr(context, 29); // x29
+#else
+#error Unsupported architecture
+#endif
+ uptr sp = get_cfa(context);
+ TagMemory(sp, fp - sp, 0);
+ }
+
+ return rc;
+}
