crtools: dump and restore clear_tid_address

pthread_join works with this patch
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

cr-dump.c

@@ -1152,6 +1152,8 @@ static int dump_task_thread(pid_t pid, struct cr_fdset *cr_fdset)
 	ret = get_task_regs(pid, core);
 	if (ret)
 		goto err_free;
+	jerr(ptrace(PTRACE_GET_TID_ADDRESS, pid, NULL,
+			&core->clear_tid_address), err_free);
 	pr_info("OK\n");
 
 	core->tc.task_state = TASK_ALIVE;

include/image.h

@@ -312,6 +312,7 @@ struct core_entry {
 			struct image_header	header;
 			struct task_core_entry	tc;
 			struct ckpt_arch_entry	arch;
+			u64 clear_tid_address;
 		};
 		u8 __core_pad[CKPT_CORE_SIZE];
 	};

include/ptrace.h

@@ -13,6 +13,7 @@
 #endif
 
 #define PTRACE_LISTEN		0x4208
+#define PTRACE_GET_TID_ADDRESS	0x4209
 
 #define PTRACE_SEIZE_DEVEL	0x80000000
 

restorer.c

@@ -144,6 +144,8 @@ long restore_thread(struct thread_restore_args *args)
 		/* We're to close it! */
 		sys_close(args->fd_core);
 
+		sys_set_tid_address((int *) core_entry->clear_tid_address);
+
 		rt_sigframe = (void *)args->mem_zone.rt_sigframe + 8;
 
 #define CPREGT1(d)	rt_sigframe->uc.uc_mcontext.d = core_entry->arch.gpregs.d
@@ -427,6 +429,8 @@ long restore_task(struct task_restore_core_args *args)
 		goto core_restore_end;
 	}
 
+	sys_set_tid_address((int *) core_entry->clear_tid_address);
+
 	/*
 	 * Tune up the task fields.
 	 */