diff --git a/lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.h b/lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.h
--- a/lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.h
+++ b/lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.h
@@ -85,6 +85,9 @@
 
   uint32_t GetPluginVersion() override;
 
+  lldb::addr_t FixCodeAddress(lldb::addr_t pc) override;
+  lldb::addr_t FixDataAddress(lldb::addr_t pc) override;
+
 protected:
   lldb::ValueObjectSP
   GetReturnValueObjectImpl(lldb_private::Thread &thread,
diff --git a/lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.cpp b/lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.cpp
--- a/lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.cpp
+++ b/lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.cpp
@@ -787,6 +787,56 @@
   return (pc & pac_sign_extension) ? pc | mask : pc & (~mask);
 }
 
+// Reads code or data address mask for the current Linux process.
+static lldb::addr_t ReadLinuxProcessAddressMask(lldb::ProcessSP process_sp,
+                                                llvm::StringRef reg_name) {
+  // Linux configures user-space virtual addresses with top byte ignored.
+  // We set default value of mask such that top byte is masked out.
+  uint64_t address_mask = ~((1ULL << 56) - 1);
+  // If Pointer Authentication feature is enabled then Linux exposes
+  // PAC data and code mask register. Try reading relevant register
+  // below and merge it with default address mask calculated above.
+  lldb::ThreadSP thread_sp = process_sp->GetThreadList().GetSelectedThread();
+  if (thread_sp) {
+    lldb::RegisterContextSP reg_ctx_sp = thread_sp->GetRegisterContext();
+    if (reg_ctx_sp) {
+      const RegisterInfo *reg_info =
+          reg_ctx_sp->GetRegisterInfoByName(reg_name, 0);
+      if (reg_info) {
+        lldb::addr_t mask_reg_val = reg_ctx_sp->ReadRegisterAsUnsigned(
+            reg_info->kinds[eRegisterKindLLDB], LLDB_INVALID_ADDRESS);
+        if (mask_reg_val != LLDB_INVALID_ADDRESS)
+          address_mask |= mask_reg_val;
+      }
+    }
+  }
+  return address_mask;
+}
+
+lldb::addr_t ABISysV_arm64::FixCodeAddress(lldb::addr_t pc) {
+  if (lldb::ProcessSP process_sp = GetProcessSP()) {
+    if (process_sp->GetTarget().GetArchitecture().GetTriple().isOSLinux() &&
+        !process_sp->GetCodeAddressMask())
+      process_sp->SetCodeAddressMask(
+          ReadLinuxProcessAddressMask(process_sp, "code_mask"));
+
+    return FixAddress(pc, process_sp->GetCodeAddressMask());
+  }
+  return pc;
+}
+
+lldb::addr_t ABISysV_arm64::FixDataAddress(lldb::addr_t pc) {
+  if (lldb::ProcessSP process_sp = GetProcessSP()) {
+    if (process_sp->GetTarget().GetArchitecture().GetTriple().isOSLinux() &&
+        !process_sp->GetDataAddressMask())
+      process_sp->SetDataAddressMask(
+          ReadLinuxProcessAddressMask(process_sp, "data_mask"));
+
+    return FixAddress(pc, process_sp->GetDataAddressMask());
+  }
+  return pc;
+}
+
 void ABISysV_arm64::Initialize() {
   PluginManager::RegisterPlugin(GetPluginNameStatic(),
                                 "SysV ABI for AArch64 targets", CreateInstance);
diff --git a/lldb/test/API/functionalities/postmortem/elf-core/TestLinuxCore.py b/lldb/test/API/functionalities/postmortem/elf-core/TestLinuxCore.py
--- a/lldb/test/API/functionalities/postmortem/elf-core/TestLinuxCore.py
+++ b/lldb/test/API/functionalities/postmortem/elf-core/TestLinuxCore.py
@@ -20,6 +20,7 @@
     mydir = TestBase.compute_mydir(__file__)
 
     _aarch64_pid = 37688
+    _aarch64_pac_pid = 387
     _i386_pid = 32306
     _x86_64_pid = 32259
     _s390x_pid = 1045
@@ -257,6 +258,18 @@
 
         self.dbg.DeleteTarget(target)
 
+    @skipIfLLVMTargetMissing("AArch64")
+    def test_aarch64_pac(self):
+        """Test that lldb can unwind stack for AArch64 elf core file with PAC enabled."""
+
+        target = self.dbg.CreateTarget("linux-aarch64-pac.out")
+        self.assertTrue(target, VALID_TARGET)
+        process = target.LoadCore("linux-aarch64-pac.core")
+
+        self.check_all(process, self._aarch64_pac_pid, self._aarch64_regions, "a.out")
+
+        self.dbg.DeleteTarget(target)
+
     @skipIfLLVMTargetMissing("AArch64")
     @expectedFailureAll(archs=["aarch64"], oslist=["freebsd"],
                         bugnumber="llvm.org/pr49415")
diff --git a/lldb/test/API/functionalities/postmortem/elf-core/linux-aarch64-pac.out b/lldb/test/API/functionalities/postmortem/elf-core/linux-aarch64-pac.out
new file mode 100755
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
GIT binary patch
literal 0
Hc$@<O00001

literal 0
Hc$@<O00001

diff --git a/lldb/test/API/functionalities/unwind/aarch64_unwind_pac/Makefile b/lldb/test/API/functionalities/unwind/aarch64_unwind_pac/Makefile
new file mode 100644
--- /dev/null
+++ b/lldb/test/API/functionalities/unwind/aarch64_unwind_pac/Makefile
@@ -0,0 +1,5 @@
+C_SOURCES := main.c
+
+CFLAGS := -g -Os -march=armv8.3-a -mbranch-protection=pac-ret+leaf
+
+include Makefile.rules
diff --git a/lldb/test/API/functionalities/unwind/aarch64_unwind_pac/TestAArch64UnwindPAC.py b/lldb/test/API/functionalities/unwind/aarch64_unwind_pac/TestAArch64UnwindPAC.py
new file mode 100644
--- /dev/null
+++ b/lldb/test/API/functionalities/unwind/aarch64_unwind_pac/TestAArch64UnwindPAC.py
@@ -0,0 +1,44 @@
+"""
+Test that we can backtrace correctly when AArch64 PAC is enabled
+"""
+
+import lldb
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test import lldbutil
+
+
+class AArch64UnwindPAC(TestBase):
+    mydir = TestBase.compute_mydir(__file__)
+
+    @skipIf(archs=no_match(["aarch64"]))
+    @skipIf(oslist=no_match(['linux']))
+    def test(self):
+        """Test that we can backtrace correctly when AArch64 PAC is enabled"""
+        self.build()
+
+        self.line = line_number('main.c', '// Frame func_c')
+
+        exe = self.getBuildArtifact("a.out")
+        self.runCmd("file " + exe, CURRENT_EXECUTABLE_SET)
+
+        lldbutil.run_break_set_by_file_and_line(
+            self, "main.c", self.line, num_expected_locations=1)
+        self.runCmd("run", RUN_SUCCEEDED)
+        self.expect("thread backtrace", STOPPED_DUE_TO_BREAKPOINT,
+                    substrs=["stop reason = breakpoint 1."])
+
+        target = self.dbg.GetSelectedTarget()
+        process = target.GetProcess()
+        thread = process.GetThreadAtIndex(0)
+
+        backtrace = ["func_c", "func_b", "func_a", "main", "__libc_start_main", "_start"]
+        self.assertEqual(thread.GetNumFrames(), len(backtrace))
+        for frame_idx, frame in enumerate(thread.frames):
+            frame = thread.GetFrameAtIndex(frame_idx)
+            self.assertTrue(frame)
+            self.assertEqual(frame.GetFunctionName(), backtrace[frame_idx])
+			# Check line number for functions in main.c
+            if (frame_idx < 4):
+                self.assertEqual(frame.GetLineEntry().GetLine(),
+                                 line_number("main.c", "Frame " + backtrace[frame_idx]))
diff --git a/lldb/test/API/functionalities/unwind/aarch64_unwind_pac/main.c b/lldb/test/API/functionalities/unwind/aarch64_unwind_pac/main.c
new file mode 100644
--- /dev/null
+++ b/lldb/test/API/functionalities/unwind/aarch64_unwind_pac/main.c
@@ -0,0 +1,24 @@
+// This program makes a multi tier nested function call to test AArch64
+// Pointer Authentication feature.
+
+// To enable PAC return address signing compile with following clang arguments:
+// -march=armv8.3-a -mbranch-protection=pac-ret+leaf
+
+#include <stdlib.h>
+
+static void __attribute__((noinline)) func_c(void) {
+  exit(0); // Frame func_c
+}
+
+static void __attribute__((noinline)) func_b(void) {
+  func_c(); // Frame func_b
+}
+
+static void __attribute__((noinline)) func_a(void) {
+  func_b(); // Frame func_a
+}
+
+int main(int argc, char *argv[]) {
+  func_a(); // Frame main
+  return 0;
+}