diff -Naur a/configure b/configure
--- a/configure	2013-01-21 21:32:03.309892624 +0000
+++ b/configure	2013-01-21 21:46:47.338914238 +0000
@@ -3693,6 +3693,7 @@
 case "$target_arch2" in
   i386)
     target_phys_bits=64
+    target_nptl="yes"
   ;;
   x86_64)
     TARGET_BASE_ARCH=i386
diff -Naur a/linux-user/syscall.c b/linux-user/syscall.c
--- a/linux-user/syscall.c	2013-01-21 21:32:02.279904484 +0000
+++ b/linux-user/syscall.c	2013-01-21 21:55:28.635750789 +0000
@@ -4188,6 +4188,13 @@
     unlock_user_struct(target_ldt_info, ptr, 1);
     return 0;
 }
+
+static inline void cpu_set_tls(CPUX86State *env, target_ulong newtls)
+{
+    do_set_thread_area(env, newtls);
+    /* reload gs */
+    cpu_x86_load_seg(env, R_GS, env->segs[R_GS].selector);
+}
 #endif /* TARGET_I386 && TARGET_ABI32 */
 
 #ifndef TARGET_ABI32
@@ -4313,7 +4320,16 @@
         init_task_state(ts);
         /* we create a new CPU instance. */
         new_env = cpu_copy(env);
-#if defined(TARGET_I386) || defined(TARGET_SPARC) || defined(TARGET_PPC)
+#if defined(TARGET_I386)
+        new_env->idt.base = target_mmap(0, sizeof(uint64_t) * (env->idt.limit + 1),
+            PROT_READ|PROT_WRITE,
+            MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+        memcpy(g2h(new_env->idt.base), g2h(env->idt.base), sizeof(uint64_t) * (env->idt.limit + 1));
+        new_env->gdt.base = target_mmap(0, sizeof(uint64_t) * TARGET_GDT_ENTRIES,
+            PROT_READ|PROT_WRITE,
+            MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
+        memcpy(g2h(new_env->gdt.base), g2h(env->gdt.base), sizeof(uint64_t) * TARGET_GDT_ENTRIES);
+#elif defined(TARGET_SPARC) || defined(TARGET_PPC)
         cpu_reset(ENV_GET_CPU(new_env));
 #endif
         /* Init regs that differ from the parent.  */