auto import from //depot/cupcake/@135843
diff --git a/libc/arch-x86/syscalls/_exit_thread.S b/libc/arch-x86/syscalls/_exit_thread.S
new file mode 100644
index 0000000..16aaa5b
--- /dev/null
+++ b/libc/arch-x86/syscalls/_exit_thread.S
@@ -0,0 +1,23 @@
+/* autogenerated by gensyscalls.py */
+#include <sys/linux-syscalls.h>
+
+ .text
+ .type _exit_thread, @function
+ .globl _exit_thread
+ .align 4
+
+_exit_thread:
+ pushl %ebx
+ mov 8(%esp), %ebx
+ movl $__NR_exit, %eax
+ int $0x80
+ cmpl $-129, %eax
+ jb 1f
+ negl %eax
+ pushl %eax
+ call __set_errno
+ addl $4, %esp
+ orl $-1, %eax
+1:
+ popl %ebx
+ ret