Add x86_debug_reg_state to gdbserver

This commit introduces a new function, x86_debug_reg_state, that
shared x86 code can use to access the local mirror of a process's
debug registers.  This function already existed in GDB and was
in use by GDB's x86_linux_prepare_to_resume.  An equivalent was
written for gdbserver and gdbserver's x86_linux_prepare_to_resume
was modified to use it.

gdb/ChangeLog:

	* x86-nat.h (x86_debug_reg_state): Move declaration to...
	* nat/x86-dregs.h (x86_debug_reg_state): New declaration.

gdb/gdbserver/ChangeLog:

	* linux-x86-low.c (x86_debug_reg_state): New function.
	(x86_linux_prepare_to_resume): Use the above.

1 files changed, 12 insertions, 4 deletions

diff --git a/gdb/gdbserver/linux-x86-low.c b/gdb/gdbserver/linux-x86-low.c
index 66dfc5d..fe4fd25 100644
--- a/gdb/gdbserver/linux-x86-low.c
+++ b/gdb/gdbserver/linux-x86-low.c
@@ -776,6 +776,16 @@ x86_linux_new_thread (void)
   return info;
 }
 
+/* See nat/x86-dregs.h.  */
+
+struct x86_debug_reg_state *
+x86_debug_reg_state (pid_t pid)
+{
+  struct process_info *proc = find_process_pid (pid);
+
+  return &proc->priv->arch_private->debug_reg_state;
+}
+
 /* Called when resuming a thread.
    If the debug regs have changed, update the thread's copies.  */
 
@@ -787,11 +797,9 @@ x86_linux_prepare_to_resume (struct lwp_info *lwp)
 
   if (lwp->arch_private->debug_registers_changed)
     {
-      int i;
-      int pid = ptid_get_pid (ptid);
-      struct process_info *proc = find_process_pid (pid);
       struct x86_debug_reg_state *state
-	= &proc->priv->arch_private->debug_reg_state;
+	= x86_debug_reg_state (ptid_get_pid (ptid));
+      int i;
 
       x86_linux_dr_set (ptid, DR_CONTROL, 0);