[Lldb-commits] [lldb] [lldb][AArch64] Add SME2's ZT0 register (PR #70205)

[David Spickett via lldb-commits]

================
@@ -624,6 +661,21 @@ NativeRegisterContextLinux_arm64::CacheAllRegisters(uint32_t &cached_size) {
     error = ReadZA();
     if (error.Fail())
       return error;
+
+    // We will only be restoring ZT data if ZA is active. As writing to an
+    // inactive ZT enables ZA, which may not be desireable.
+    if (
+        // If we have ZT0, or in other words, if we have SME2.
+        GetRegisterInfo().IsZTPresent() &&
+        // And ZA is active, which means that ZT0 is also active.
+        m_za_header.size > sizeof(m_za_header)) {
+      cached_size += sizeof(RegisterSetType) + GetZTBufferSize();
+      // Unlike ZA where we have to fake data for an inactive ZA, the kernel
+      // handles an inactive ZA for us and always returns some data.
----------------
DavidSpickett wrote:

Done.

https://github.com/llvm/llvm-project/pull/70205