[libunwind][Android] Fix findUnwindSections for ARM EHABI Bionic

Summary:
Fix the arm_section_length count. The meaning of the arm_section_length
field changed from num-of-elements to num-of-bytes when the
dl_unwind_find_exidx special case was removed (D30306 and D30681). The
special case was restored in D39468, but that patch didn't account for the
change in arm_section_length's meaning.

That patch worked when it was applied to the NDK's fork of libunwind,
because it never removed the special case in the first place, and the
special case is probably disabled in the Android platform's copy of
libunwind, because __ANDROID_API__ is greater than 21.

Turn the dl_unwind_find_exidx special case on unconditionally for Bionic.
Bionic's dl_unwind_find_exidx is much faster than using dl_iterate_phdr.
(e.g. Bionic stores exidx info on an internal soinfo object.)

Reviewers: thomasanderson, srhines, danalbert, ed, keith.walker.arm, mclow.lists, compnerd

Reviewed By: srhines, danalbert

Subscribers: srhines, kristof.beyls, christof, libcxx-commits

Tags: #libc

Differential Revision: https://reviews.llvm.org/D68972

llvm-svn: 375275

2 files changed, 11 insertions, 8 deletions

diff --git a/libunwind/src/AddressSpace.hpp b/libunwind/src/AddressSpace.hpp
index 6c134086e0b..908c898d740 100644
--- a/libunwind/src/AddressSpace.hpp
+++ b/libunwind/src/AddressSpace.hpp
@@ -32,6 +32,13 @@
 #endif
 #endif
 
+#if defined(_LIBUNWIND_ARM_EHABI)
+struct EHABIIndexEntry {
+  uint32_t functionOffset;
+  uint32_t data;
+};
+#endif
+
 #ifdef __APPLE__
 #include <mach-o/getsect.h>
 namespace libunwind {
@@ -462,12 +469,13 @@ inline bool LocalAddressSpace::findUnwindSections(pint_t targetAddr,
   (void)targetAddr;
   (void)info;
   return true;
-#elif defined(_LIBUNWIND_ARM_EHABI) && defined(__BIONIC__) &&                  \
-    (__ANDROID_API__ < 21)
+#elif defined(_LIBUNWIND_ARM_EHABI) && defined(__BIONIC__)
+  // For ARM EHABI, Bionic didn't implement dl_iterate_phdr until API 21. After
+  // API 21, dl_iterate_phdr exists, but dl_unwind_find_exidx is much faster.
   int length = 0;
   info.arm_section =
       (uintptr_t)dl_unwind_find_exidx((_Unwind_Ptr)targetAddr, &length);
-  info.arm_section_length = (uintptr_t)length;
+  info.arm_section_length = (uintptr_t)length * sizeof(EHABIIndexEntry);
   if (info.arm_section && info.arm_section_length)
     return true;
 #elif defined(_LIBUNWIND_ARM_EHABI) || defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
diff --git a/libunwind/src/UnwindCursor.hpp b/libunwind/src/UnwindCursor.hpp
index 488c3173dd7..b4d44e111a6 100644
--- a/libunwind/src/UnwindCursor.hpp
+++ b/libunwind/src/UnwindCursor.hpp
@@ -1222,11 +1222,6 @@ template <typename A, typename R> bool UnwindCursor<A, R>::isSignalFrame() {
 #endif // defined(_LIBUNWIND_SUPPORT_SEH_UNWIND)
 
 #if defined(_LIBUNWIND_ARM_EHABI)
-struct EHABIIndexEntry {
-  uint32_t functionOffset;
-  uint32_t data;
-};
-
 template<typename A>
 struct EHABISectionIterator {
   typedef EHABISectionIterator _Self;