From 63603295544821124aa5bed9f0e153d0c809f01a Mon Sep 17 00:00:00 2001
From: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
Date: Sun, 27 Apr 2025 23:57:56 -0300
Subject: [PATCH] GDB: linux-nat: Make tdesc parameters available early

Otherwise reg_buffer::initialize_variable_size_registers () won't be
able to resolve the types of variable-size registers.
---
 gdb/linux-nat.c | 11 +++++++++++
 gdb/linux-nat.h |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c
index 2f98060506b..72d1448da62 100644
--- a/gdb/linux-nat.c
+++ b/gdb/linux-nat.c
@@ -4637,6 +4637,17 @@ linux_nat_target::supports_set_thread_options (gdb_thread_options options)
   return ((options & supported_options) == options);
 }
 
+/* See gdb/process-stratum-target.h.  */
+
+void
+linux_nat_target::supply_early_registers (regcache *regcache)
+{
+  if (regcache->has_variable_size_registers ())
+    /* We need the values of target description parameter early, so make
+       sure they're available.  */
+    regcache->update_tdesc_parameters ();
+}
+
 linux_nat_target::linux_nat_target ()
 {
   /* We don't change the stratum; this target will sit at
diff --git a/gdb/linux-nat.h b/gdb/linux-nat.h
index 6e539918ced..62f4296279f 100644
--- a/gdb/linux-nat.h
+++ b/gdb/linux-nat.h
@@ -192,6 +192,8 @@ public:
      recognizes SIGTRAP only.  */
   virtual bool low_status_is_event (int status);
 
+  void supply_early_registers (regcache *regcache) override;
+
 protected:
 
     void post_startup_inferior (ptid_t) override;
-- 
2.47.2