Some fixes for hardened libunwind

Author: kovdan01

libunwind/src/Registers.hpp

@@ -1853,6 +1853,9 @@ class _LIBUNWIND_HIDDEN Registers_arm64 {
   Registers_arm64();
   Registers_arm64(const void *registers);
 
+  Registers_arm64(const Registers_arm64 &other);
+  Registers_arm64 &operator=(const Registers_arm64 &other);
+
   bool        validRegister(int num) const;
   uint64_t    getRegister(int num) const;
   void        setRegister(int num, uint64_t value);

libunwind/src/UnwindCursor.hpp

@@ -1054,7 +1054,7 @@ class UnwindCursor : public AbstractUnwindCursor{
                                const UnwindInfoSections &sects,
                                uint32_t fdeSectionOffsetHint = 0);
   int stepWithDwarfFDE(bool stage2) {
-    typename R::reg_t rawPC = this->getReg(UNW_REG_IP);
+    typename R::reg_t rawPC = _registers.getIP();
     typename R::link_reg_t pc;
     _registers.loadAndAuthenticateLinkRegister(rawPC, &pc);
     return DwarfInstructions<A, R>::stepWithDwarf(
@@ -2671,7 +2671,7 @@ void UnwindCursor<A, R>::setInfoBasedOnIPRegister(bool isReturnAddress) {
   _isSigReturn = false;
 #endif
 
-  typename R::reg_t rawPC = this->getReg(UNW_REG_IP);
+  typename R::reg_t rawPC = _registers.getIP();
 
 #if defined(_LIBUNWIND_ARM_EHABI)
   // Remove the thumb bit so the IP represents the actual instruction address.
@@ -3231,7 +3231,7 @@ void UnwindCursor<A, R>::getInfo(unw_proc_info_t *info) {
 template <typename A, typename R>
 bool UnwindCursor<A, R>::getFunctionName(char *buf, size_t bufLen,
                                          unw_word_t *offset) {
-  typename R::reg_t rawPC = this->getReg(UNW_REG_IP);
+  typename R::reg_t rawPC = _registers.getIP();
   typename R::link_reg_t pc;
   _registers.loadAndAuthenticateLinkRegister(rawPC, &pc);