[Bug testsuite/31705] gdb.base/watchpoint-running.exp fails on arm

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31705

--- Comment #14 from Tom de Vries <vries at gcc dot gnu.org> ---
Copied this approach from aarch64-linux-nat.c:
...
diff --git a/gdb/arm-linux-nat.c b/gdb/arm-linux-nat.c
index 50c24ecfcd2..f24e3b45ffb 100644
--- a/gdb/arm-linux-nat.c
+++ b/gdb/arm-linux-nat.c
@@ -92,6 +92,12 @@ class arm_linux_nat_target final : public linux_nat_target

   bool watchpoint_addr_within_range (CORE_ADDR, CORE_ADDR, int) override;

+  /* Override the GNU/Linux inferior startup hook.  */
+  void post_startup_inferior (ptid_t) override;
+
+  /* Override the GNU/Linux post attach hook.  */
+  void post_attach (int pid) override;
+
   const struct target_desc *read_description () override;

   /* Override linux_nat_target low methods.  */
@@ -108,6 +114,8 @@ class arm_linux_nat_target final : public linux_nat_target

 static arm_linux_nat_target the_arm_linux_nat_target;

+static const struct arm_linux_hwbp_cap *arm_linux_get_hwbp_cap (void);
+
 /* Get the whole floating point state of the process and store it
    into regcache.  */

@@ -527,6 +535,24 @@ ps_get_thread_area (struct ps_prochandle *ph,
   return PS_OK;
 }

+/* Implement the virtual inf_ptrace_target::post_startup_inferior method.  */
+
+void
+arm_linux_nat_target::post_startup_inferior (ptid_t ptid)
+{
+  arm_linux_get_hwbp_cap ();
+  linux_nat_target::post_startup_inferior (ptid);
+}
+
+/* Implement the "post_attach" target_ops method.  */
+
+void
+arm_linux_nat_target::post_attach (int pid)
+{
+  arm_linux_get_hwbp_cap ();
+  linux_nat_target::post_attach (pid);
+}
+
 const struct target_desc *
 arm_linux_nat_target::read_description ()
 {
...

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