dump: dump tid_addr_clear for thread leaders

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-dump.c

@@ -666,6 +666,7 @@ static int dump_task_core_all(struct parasite_ctl *ctl,
 		goto err;
 
 	core_put_tls(core, misc->tls);
+	CORE_THREAD_ARCH_INFO(core)->clear_tid_addr = encode_pointer(misc->tid_addr);
 
 	ret = pb_write_one(fd_core, core, PB_CORE);
 	if (ret < 0)

include/parasite.h

@@ -144,6 +144,7 @@ static inline int posix_timers_dump_size(int timer_n)
 
 struct parasite_dump_misc {
 	unsigned long		brk;
+	unsigned int		*tid_addr;
 
 	u32 pid;
 	u32 sid;

pie/parasite.c

@@ -138,6 +138,8 @@ static int dump_posix_timers(struct parasite_dump_posix_timers_args *args)
 
 static int dump_misc(struct parasite_dump_misc *args)
 {
+	int ret;
+
 	args->brk = sys_brk(0);
 
 	args->pid = sys_getpid();
@@ -147,7 +149,9 @@ static int dump_misc(struct parasite_dump_misc *args)
 	args->umask = sys_umask(0);
 	sys_umask(args->umask); /* never fails */
 
-	return 0;
+	ret = sys_prctl(PR_GET_TID_ADDRESS, (unsigned long) &args->tid_addr, 0, 0, 0);
+
+	return ret;
 }
 
 static int dump_creds(struct parasite_dump_creds *args)