[PATCH v4 19/25] AArch64: Add MTE register set support for core files

[Luis Machado via Gdb-patches <gdb-patches@sourceware.org>]

This patch handles the tagged_addr_ctrl register that is exported when
generating a core file.

gdb/ChangeLog:

YYYY-MM-DD  Luis Machado  <luis.machado@linaro.org>

	* aarch64-linux-tdep.c
	(aarch64_linux_iterate_over_regset_sections): Handle MTE register set.
	* aarch64-linux-tdep.h (AARCH64_LINUX_SIZEOF_MTE_REGSET): Define.
---
 gdb/aarch64-linux-tdep.c | 20 ++++++++++++++++++++
 gdb/aarch64-linux-tdep.h |  3 +++
 2 files changed, 23 insertions(+)

diff --git a/gdb/aarch64-linux-tdep.c b/gdb/aarch64-linux-tdep.c
index 1bdd127e0d..62184d46e7 100644
--- a/gdb/aarch64-linux-tdep.c
+++ b/gdb/aarch64-linux-tdep.c
@@ -727,6 +727,26 @@ aarch64_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
 	  AARCH64_LINUX_SIZEOF_PAUTH, &aarch64_linux_pauth_regset,
 	  "pauth registers", cb_data);
     }
+
+  /* Handle MTE registers.  */
+  if (tdep->has_mte ())
+    {
+      /* Create this on the fly in order to handle the variable location.  */
+      const struct regcache_map_entry mte_regmap[] =
+	{
+	  { 1, tdep->mte_reg_base, 4},
+	  { 0 }
+	};
+
+      const struct regset aarch64_linux_mte_regset =
+	{
+	  mte_regmap, regcache_supply_regset, regcache_collect_regset
+	};
+
+      cb (".reg-aarch-mte", AARCH64_LINUX_SIZEOF_MTE_REGSET,
+	  AARCH64_LINUX_SIZEOF_MTE_REGSET, &aarch64_linux_mte_regset,
+	  "MTE registers", cb_data);
+    }
 }
 
 /* Implement the "core_read_description" gdbarch method.  */
diff --git a/gdb/aarch64-linux-tdep.h b/gdb/aarch64-linux-tdep.h
index a7094bb7c0..2495379d5b 100644
--- a/gdb/aarch64-linux-tdep.h
+++ b/gdb/aarch64-linux-tdep.h
@@ -36,6 +36,9 @@
 /* The pauth regset consists of 2 X sized registers.  */
 #define AARCH64_LINUX_SIZEOF_PAUTH (2 * X_REGISTER_SIZE)
 
+/* The MTE regset consists of a 32-bit register.  */
+#define AARCH64_LINUX_SIZEOF_MTE_REGSET (4)
+
 extern const struct regset aarch64_linux_gregset;
 extern const struct regset aarch64_linux_fpregset;
 
-- 
2.25.1