1 files changed, 12 insertions, 0 deletions

diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 9a48b7a577e7..4a6e46a9a3d7 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -103,6 +103,18 @@ ENTRY(ret_from_kernel_thread)
  UNWIND(.fnend)
 ENDPROC(ret_from_kernel_thread)
 
+/*
+ * turn a kernel thread into userland process
+ * use: ret_from_kernel_execve(struct pt_regs *normal)
+ */
+ENTRY(ret_from_kernel_execve)
+        mov     why, #0                 @ not a syscall
+        str     why, [r0, #S_R0]        @ ... and we want 0 in ->ARM_r0 as well
+        get_thread_info tsk             @ thread structure
+        mov     sp, r0                  @ stack pointer just under pt_regs
+        b       ret_slow_syscall
+ENDPROC(ret_from_kernel_execve)
+
         .equ NR_syscalls,0
 #define CALL(x) .equ NR_syscalls,NR_syscalls+1
 #include "calls.S"