[binutils-gdb] Read the tpidr register from NT_ARM_TLS core dump notes on Linux Aarch64.

[John Baldwin <jhb@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=224151d7748ef13df82878067266cfaa9861e360

commit 224151d7748ef13df82878067266cfaa9861e360
Author: John Baldwin <jhb@FreeBSD.org>
Date:   Tue May 3 16:05:10 2022 -0700

    Read the tpidr register from NT_ARM_TLS core dump notes on Linux Aarch64.

Diff:
---
 gdb/aarch64-linux-tdep.c | 21 ++++++++++++++++++++-
 gdb/aarch64-linux-tdep.h |  3 +++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/gdb/aarch64-linux-tdep.c b/gdb/aarch64-linux-tdep.c
index 8cfb64d9f4a..dbebcd4f0e0 100644
--- a/gdb/aarch64-linux-tdep.c
+++ b/gdb/aarch64-linux-tdep.c
@@ -749,6 +749,24 @@ aarch64_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
 	  AARCH64_LINUX_SIZEOF_MTE_REGSET, &aarch64_linux_mte_regset,
 	  "MTE registers", cb_data);
     }
+
+  if (tdep->has_tls ())
+    {
+      const struct regcache_map_entry tls_regmap[] =
+	{
+	  { 1, tdep->tls_regnum, 8 },
+	  { 0 }
+	};
+
+      const struct regset aarch64_linux_tls_regset =
+	{
+	  tls_regmap, regcache_supply_regset, regcache_collect_regset
+	};
+
+      cb (".reg-aarch-tls", AARCH64_LINUX_SIZEOF_TLSREGSET,
+	  AARCH64_LINUX_SIZEOF_TLSREGSET, &aarch64_linux_tls_regset,
+	  "TLS register", cb_data);
+    }
 }
 
 /* Implement the "core_read_description" gdbarch method.  */
@@ -757,13 +775,14 @@ static const struct target_desc *
 aarch64_linux_core_read_description (struct gdbarch *gdbarch,
 				     struct target_ops *target, bfd *abfd)
 {
+  asection *tls = bfd_get_section_by_name (abfd, ".reg-aarch-tls");
   CORE_ADDR hwcap = linux_get_hwcap (target);
   CORE_ADDR hwcap2 = linux_get_hwcap2 (target);
 
   bool pauth_p = hwcap & AARCH64_HWCAP_PACA;
   bool mte_p = hwcap2 & HWCAP2_MTE;
   return aarch64_read_description (aarch64_linux_core_read_vq (gdbarch, abfd),
-				   pauth_p, mte_p, false);
+				   pauth_p, mte_p, tls != nullptr);
 }
 
 /* Implementation of `gdbarch_stap_is_single_operand', as defined in
diff --git a/gdb/aarch64-linux-tdep.h b/gdb/aarch64-linux-tdep.h
index 8ae33efc605..9a7e4339dba 100644
--- a/gdb/aarch64-linux-tdep.h
+++ b/gdb/aarch64-linux-tdep.h
@@ -39,6 +39,9 @@
 /* The MTE regset consists of a 64-bit register.  */
 #define AARCH64_LINUX_SIZEOF_MTE_REGSET (8)
 
+/* The TLS regset consists of a single register.  */
+#define AARCH64_LINUX_SIZEOF_TLSREGSET (X_REGISTER_SIZE)
+
 extern const struct regset aarch64_linux_gregset;
 extern const struct regset aarch64_linux_fpregset;