commit 98d79de51d4cb6002ff0d3686394c309529e5267
author Peter Collingbourne <pcc@google.com> Mon Sep 14 20:27:36 2020 -0700
committer Peter Collingbourne <pcc@google.com> Tue Sep 15 21:32:36 2020 -0700
tree 1b9b47b46d0934cf14ee5c8158ccae3c37b35aff
parent 3936985e75eace1adeeb8d64d4c98e737318d284

Dump the per-thread TAGGED_ADDR_CTRL value if available.

This value indicates whether memory tagging is enabled on a thread,
the mode (sync or async) and the set of excluded tags. This information
can sometimes be important for understanding an MTE related crash,
so include it in the per-thread tombstone output.

Bug: 135772972
Change-Id: I25a16e10ac7fbb2b1ab2a961a5279f787039000b

libc/platform/bionic/mte_kernel.h

diff --git a/libc/platform/bionic/mte_kernel.h b/libc/platform/bionic/mte_kernel.h
index e8ef2a5..d81480a 100644
--- a/libc/platform/bionic/mte_kernel.h
+++ b/libc/platform/bionic/mte_kernel.h
@@ -54,4 +54,6 @@
 #define PTRACE_PEEKMTETAGS 33
 #define PTRACE_POKEMTETAGS 34
 
+#define NT_ARM_TAGGED_ADDR_CTRL 0x409
+
 #endif