Fix handling of ro segments for embedded libs.
When a shared library is loaded directly from an apk, the new way the
linker splits a shared library into a read-only and execute segment
broke unwinding. Modify the code to handle this case.
Other changes:
- Modify the algorithm for finding read-only map entries. Before, the code
would search the entire map for the closest offset. Now it simply looks
at the previous map. I did this because the old code was too lenient and
might still work even if the linker changes. I want this to break if the
linker behavior changes so that I can analyze the change.
- Update the tools to use PTRACE_SEIZE instead of PTRACE_ATTACH since
PTRACE_ATTACH doesn't work in all cases.
- Small refactor of the GetFileMemory function.
- Add new unit test cases and new offline unwind test cases.
Bug: 120618231
Test: Ran new unit tests, ran original failing test.
Change-Id: I4bade55cf33220d52f1d5e9b0cbbbcc8419669d4
diff --git a/libunwindstack/Android.bp b/libunwindstack/Android.bp
index a5e0dc9..4e0470e 100644
--- a/libunwindstack/Android.bp
+++ b/libunwindstack/Android.bp
@@ -235,6 +235,8 @@
"tests/files/offline/jit_map_arm/*",
"tests/files/offline/gnu_debugdata_arm/*",
"tests/files/offline/offset_arm/*",
+ "tests/files/offline/shared_lib_in_apk_arm64/*",
+ "tests/files/offline/shared_lib_in_apk_memory_only_arm64/*",
"tests/files/offline/straddle_arm/*",
"tests/files/offline/straddle_arm64/*",
],