diff --git a/libcxx/test/configs/apple-libc++-backdeployment.cfg.in b/libcxx/test/configs/apple-libc++-backdeployment.cfg.in
--- a/libcxx/test/configs/apple-libc++-backdeployment.cfg.in
+++ b/libcxx/test/configs/apple-libc++-backdeployment.cfg.in
@@ -30,6 +30,15 @@
         The dylib in that hierarchy is the one that will be used at runtime when running
         the tests.
         """),
+    libcxx.test.dsl.Parameter(name='unwind_runtime_root', type=str,
+        actions=lambda root: [libcxx.test.dsl.AddSubstitution('%{unwind-runtime-root}', root)],
+        help="""
+        The simulated root of the system (for libunwind) when running tests.
+
+        This should be a directory hierarchy under which the libunwind dylib can be found.
+        The dylib in that hierarchy is the one that will be used at runtime when running
+        the tests.
+        """),
 ]
 
 config.substitutions.append(('%{flags}',
@@ -42,7 +51,7 @@
     '-nostdlib++ -L %{install}/lib -lc++'
 ))
 config.substitutions.append(('%{exec}',
-    '%{executor} --execdir %T --env DYLD_LIBRARY_PATH="%{cxx-runtime-root}:%{abi-runtime-root}" -- '
+    '%{executor} --execdir %T --env DYLD_LIBRARY_PATH="%{cxx-runtime-root}:%{abi-runtime-root}:%{unwind-runtime-root}" -- '
 ))
 
 libcxx.test.newconfig.configure(
diff --git a/libcxx/utils/ci/run-buildbot b/libcxx/utils/ci/run-buildbot
--- a/libcxx/utils/ci/run-buildbot
+++ b/libcxx/utils/ci/run-buildbot
@@ -444,10 +444,13 @@
     PARAMS="target_triple=${arch}-apple-macosx${DEPLOYMENT_TARGET}"
     PARAMS+=";cxx_runtime_root=${OSX_ROOTS}/macOS/libc++/${DEPLOYMENT_TARGET}"
     PARAMS+=";abi_runtime_root=${OSX_ROOTS}/macOS/libc++abi/${DEPLOYMENT_TARGET}"
+    PARAMS+=";unwind_runtime_root=${OSX_ROOTS}/macOS/libunwind/${DEPLOYMENT_TARGET}"
     PARAMS+=";use_system_cxx_lib=True"
 
+    # TODO: We should run the libunwind tests using the back-deployment dylibs too.
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Apple.cmake" \
                    -DLIBCXX_TEST_CONFIG="apple-libc++-backdeployment.cfg.in" \
+                   -DLIBCXXABI_TEST_CONFIG="apple-libc++abi-backdeployment.cfg.in" \
                    -DLIBCXX_TEST_PARAMS="${PARAMS}" \
                    -DLIBCXXABI_TEST_PARAMS="${PARAMS}"
 
diff --git a/libcxx/test/configs/apple-libc++-backdeployment.cfg.in b/libcxxabi/test/configs/apple-libc++abi-backdeployment.cfg.in
copy from libcxx/test/configs/apple-libc++-backdeployment.cfg.in
copy to libcxxabi/test/configs/apple-libc++abi-backdeployment.cfg.in
--- a/libcxx/test/configs/apple-libc++-backdeployment.cfg.in
+++ b/libcxxabi/test/configs/apple-libc++abi-backdeployment.cfg.in
@@ -1,12 +1,12 @@
-# Testing configuration for back-deployment against older Apple system libc++.
+# Testing configuration for back-deployment against older Apple system libc++abi.
 #
-# Under this configuration, we compile and link all the test suite against the latest libc++,
-# however we run against the libc++ on a different platform. This emulates the workflow of
+# Under this configuration, we compile and link all the test suite against the latest libc++abi,
+# however we run against the libc++abi on a different platform. This emulates the workflow of
 # a developer building their application using recent tools but with the goal of deploying
 # on existing devices running an older OS (and hence an older dylib).
 
 import os, site
-site.addsitedir(os.path.join('@LIBCXX_SOURCE_DIR@', 'utils'))
+site.addsitedir(os.path.join('@LIBCXXABI_LIBCXX_PATH@', 'utils'))
 import libcxx.test.params, libcxx.test.newconfig, libcxx.test.dsl
 
 lit_config.load_config(config, '@CMAKE_CURRENT_BINARY_DIR@/cmake-bridge.cfg')
@@ -30,19 +30,29 @@
         The dylib in that hierarchy is the one that will be used at runtime when running
         the tests.
         """),
+    libcxx.test.dsl.Parameter(name='unwind_runtime_root', type=str,
+        actions=lambda root: [libcxx.test.dsl.AddSubstitution('%{unwind-runtime-root}', root)],
+        help="""
+        The simulated root of the system (for libunwind) when running tests.
+
+        This should be a directory hierarchy under which the libunwind dylib can be found.
+        The dylib in that hierarchy is the one that will be used at runtime when running
+        the tests.
+        """),
 ]
 
 config.substitutions.append(('%{flags}',
     '-isysroot {}'.format('@CMAKE_OSX_SYSROOT@') if '@CMAKE_OSX_SYSROOT@' else ''
 ))
 config.substitutions.append(('%{compile_flags}',
-    '-nostdinc++ -isystem %{install}/include/c++/v1 -I %{libcxx}/test/support'
+    '-nostdinc++ -isystem %{install}/include/c++/v1 -DLIBCXXABI_NO_TIMER -D_LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS ' +
+    '-I %{libcxx}/test/support -I %{libcxx}/src'
 ))
 config.substitutions.append(('%{link_flags}',
-    '-nostdlib++ -L %{install}/lib -lc++'
+    '-nostdlib++ -L %{install}/lib -lc++ -lc++abi'
 ))
 config.substitutions.append(('%{exec}',
-    '%{executor} --execdir %T --env DYLD_LIBRARY_PATH="%{cxx-runtime-root}:%{abi-runtime-root}" -- '
+    '%{executor} --execdir %T --env DYLD_LIBRARY_PATH="%{cxx-runtime-root}:%{abi-runtime-root}:%{unwind-runtime-root}" -- '
 ))
 
 libcxx.test.newconfig.configure(
diff --git a/libcxxabi/test/test_exception_address_alignment.pass.cpp b/libcxxabi/test/test_exception_address_alignment.pass.cpp
--- a/libcxxabi/test/test_exception_address_alignment.pass.cpp
+++ b/libcxxabi/test/test_exception_address_alignment.pass.cpp
@@ -11,9 +11,8 @@
 
 // The <unwind.h> header provided in the SDK of older Xcodes used to provide
 // an incorrectly aligned _Unwind_Exception type on non-ARM. That causes these
-// tests to fail when compiling against such a SDK, or when running against a
-// system libc++abi that was compiled with an incorrect definition of _Unwind_Exception.
-// XFAIL: apple-clang-12.0.0 && !target={{arm.*}}
+// tests to fail when running against a system libc++abi and libunwind that was
+// compiled with an incorrect definition of _Unwind_Exception.
 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
 
 // Test that the address of the exception object is properly aligned as required