================
@@ -3329,6 +3344,65 @@ int UnwindCursor<A,
R>::stepThroughSigReturn(Registers_s390x &) {
#endif // defined(_LIBUNWIND_CHECK_LINUX_SIGRETURN) &&
// defined(_LIBUNWIND_TARGET_S390X)
+#if defined(_LIBUNWIND_CHECK_FREEBSD_SIGRETURN)
+template <typename A, typename R>
+bool UnwindCursor<A, R>::setInfoForSigReturn() {
+ // Ask the kernel rather than reading instructions at a possibly invalid PC.
+ // This is only used when no unwind information was found. Keep the result
+ // local to avoid shared mutable state when unwinding from a signal handler.
+ struct kinfo_sigtramp kst = {};
+ size_t len = sizeof(kst);
+ int mib[] = {CTL_KERN, KERN_PROC, KERN_PROC_SIGTRAMP, getpid()};
+ const int savedErrno = errno;
+ const int result = sysctl(mib, 4, &kst, &len, nullptr, 0);
+ errno = savedErrno;
+ if (result != 0)
+ return false;
+
+ const pint_t pc = static_cast<pint_t>(this->getReg(UNW_REG_IP));
----------------
aokblast wrote:
Oh. I miss this. They do this by vdso. It makes sense now.
https://github.com/llvm/llvm-project/pull/235065
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