AArch64: Read pauth section from core files

gdb/ChangeLog:

	* aarch64-linux-tdep.c
	(aarch64_linux_iterate_over_regset_sections): Check for pauth
	section.
	* aarch64-linux-tdep.h (AARCH64_LINUX_SIZEOF_PAUTH): New define.

Author: a74nh

gdb/ChangeLog

@@ -1,3 +1,11 @@
+2019-03-22  Alan Hayward  <alan.hayward@arm.com>
+	    Jiong Wang  <jiong.wang@arm.com>
+
+	* aarch64-linux-tdep.c
+	(aarch64_linux_iterate_over_regset_sections): Check for pauth
+	section.
+	* aarch64-linux-tdep.h (AARCH64_LINUX_SIZEOF_PAUTH): New define.
+
 2019-03-22  Alan Hayward  <alan.hayward@arm.com>
 	    Jiong Wang  <jiong.wang@arm.com>
 

gdb/aarch64-linux-tdep.c

@@ -627,6 +627,26 @@ aarch64_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
   else
     cb (".reg2", AARCH64_LINUX_SIZEOF_FPREGSET, AARCH64_LINUX_SIZEOF_FPREGSET,
 	&aarch64_linux_fpregset, NULL, cb_data);
+
+
+  if (tdep->has_pauth ())
+    {
+      /* Create this on the fly in order to handle the variable location.  */
+      const struct regcache_map_entry pauth_regmap[] =
+	{
+	  { 2, AARCH64_PAUTH_DMASK_REGNUM (tdep->pauth_reg_base), 8},
+	  { 0 }
+	};
+
+      const struct regset aarch64_linux_pauth_regset =
+	{
+	  pauth_regmap, regcache_supply_regset, regcache_collect_regset
+	};
+
+      cb (".reg-aarch-pauth", AARCH64_LINUX_SIZEOF_PAUTH,
+	  AARCH64_LINUX_SIZEOF_PAUTH, &aarch64_linux_pauth_regset,
+	  "pauth registers", cb_data);
+    }
 }
 
 /* Implement the "core_read_description" gdbarch method.  */

gdb/aarch64-linux-tdep.h

@@ -33,6 +33,9 @@
    alignment.  */
 #define AARCH64_LINUX_SIZEOF_FPREGSET (33 * V_REGISTER_SIZE)
 
+/* The pauth regset consists of 2 X sized registers.  */
+#define AARCH64_LINUX_SIZEOF_PAUTH (2 * X_REGISTER_SIZE)
+
 extern const struct regset aarch64_linux_gregset;
 extern const struct regset aarch64_linux_fpregset;