[PATCH 4/5] hurd: add gnu_target pointer to fix thread API calls

[Samuel Thibault]

gdb/ChangeLog: 

2020-05-29  Samuel Thibault  <samuel.thibault@ens-lyon.org>

        * gnu-nat.h (gnu_target): New variable declaration.
        * i386-gnu-nat.c (_initialize_i386gnu_nat): Initialize
        gnu_target.
        * gnu-nat.c (gnu_target): New variable.
        (inf_validate_procs): Pass gnu_target to thread_change_ptid,
        add_thread_silent, and add_thread calls.
        (gnu_nat_target::create_inferior): Pass gnu_target to
        add_thread_silent, thread_change_ptid call.
        (gnu_nat_target::detach): Pass gnu_target to detach_inferior
        call.

diff --git a/gdb/gnu-nat.h b/gdb/gnu-nat.h
index 77c57817b2..7c36778394 100644
--- a/gdb/gnu-nat.h
+++ b/gdb/gnu-nat.h
@@ -150,4 +150,7 @@ struct gnu_nat_target : public inf_child_target
   void stop (ptid_t) override;
 };
 
+/* The final/concrete instance.  */
+extern gnu_nat_target *gnu_target;
+
 #endif /* GNU_NAT_H */
diff --git a/gdb/i386-gnu-nat.c b/gdb/i386-gnu-nat.c
index afbe8eff49..6382ca8acb 100644
--- a/gdb/i386-gnu-nat.c
+++ b/gdb/i386-gnu-nat.c
@@ -439,6 +439,8 @@ _initialize_i386gnu_nat ()
   x86_set_debug_register_length (4);
 #endif /* i386_DEBUG_STATE */
 
+  gnu_target = &the_i386_gnu_nat_target;
+
   /* Register the target.  */
   add_inf_child_target (&the_i386_gnu_nat_target);
 }
diff --git a/gdb/gnu-nat.c b/gdb/gnu-nat.c
index 3b438a9a43..78e9ab7f71 100644
--- a/gdb/gnu-nat.c
+++ b/gdb/gnu-nat.c
@@ -84,6 +85,8 @@ extern "C"
 #include "msg_U.h"
 }
 
+struct gnu_nat_target *gnu_target;
+
 static process_t proc_server = MACH_PORT_NULL;
 
 /* If we've sent a proc_wait_request to the proc server, the pid of the
@@ -1106,12 +1109,12 @@ inf_validate_procs (struct inf *inf)
            if (inferior_ptid == ptid_t (inf->pid))
              /* This is the first time we're hearing about thread
                 ids, after a fork-child.  */
-             thread_change_ptid (inferior_ptid, ptid);
+             thread_change_ptid (gnu_target, inferior_ptid, ptid);
            else if (inf->pending_execs != 0)
              /* This is a shell thread.  */
-             add_thread_silent (ptid);
+             add_thread_silent (gnu_target, ptid);
            else
-             add_thread (ptid);
+             add_thread (gnu_target, ptid);
          }
       }
 
@@ -2149,7 +2152,7 @@ gnu_nat_target::create_inferior (const char *exec_file,
   /* We have something that executes now.  We'll be running through
      the shell at this point (if startup-with-shell is true), but the
      pid shouldn't change.  */
-  add_thread_silent (ptid_t (pid));
+  add_thread_silent (gnu_target, ptid_t (pid));
 
   /* Attach to the now stopped child, which is actually a shell...  */
   inf_debug (inf, "attaching to child: %d", pid);
@@ -2167,7 +2170,7 @@ gnu_nat_target::create_inferior (const char *exec_file,
   inf_resume (inf);
 
   /* We now have thread info.  */
-  thread_change_ptid (inferior_ptid,
+  thread_change_ptid (gnu_target, inferior_ptid,
                      ptid_t (inf->pid, inf_pick_first_thread (), 0));
 
   gdb_startup_inferior (pid, START_INFERIOR_TRAPS_EXPECTED);
@@ -2273,7 +2276,7 @@ gnu_nat_target::detach (inferior *inf, int from_tty)
   inf_detach (gnu_current_inf);
 
   inferior_ptid = null_ptid;
-  detach_inferior (find_inferior_pid (pid));
+  detach_inferior (find_inferior_pid (gnu_target, pid));
 
   maybe_unpush_target ();
 }