um: fix stub location calculation

[linux-2.6-microblaze.git] / arch / x86 / um / shared / sysdep / stub_32.h

diff --git a/arch/x86/um/shared/sysdep/stub_32.h b/arch/x86/um/shared/sysdep/stub_32.h
index b95db9d..4c6c2be 100644 (file)
--- a/arch/x86/um/shared/sysdep/stub_32.h
+++ b/arch/x86/um/shared/sysdep/stub_32.h
@@ -101,4 +101,16 @@ static inline void remap_stack_and_trap(void)
                "memory");
 }
 
+static __always_inline void *get_stub_page(void)
+{
+       unsigned long ret;
+
+       asm volatile (
+               "movl %%esp,%0 ;"
+               "andl %1,%0"
+               : "=a" (ret)
+               : "g" (~(UM_KERN_PAGE_SIZE - 1)));
+
+       return (void *)ret;
+}
 #endif