x86: add %gs accessors for x86_32

[safe/jmp/linux-2.6] / arch / x86 / include / asm / system.h

diff --git a/arch/x86/include/asm/system.h b/arch/x86/include/asm/system.h
index 2fcc70b..70c74b8 100644 (file)
--- a/arch/x86/include/asm/system.h
+++ b/arch/x86/include/asm/system.h
@@ -182,6 +182,15 @@ extern void native_load_gs_index(unsigned);
 #define savesegment(seg, value)                                \
        asm("mov %%" #seg ",%0":"=r" (value) : : "memory")
 
+/*
+ * x86_32 user gs accessors.
+ */
+#ifdef CONFIG_X86_32
+#define get_user_gs(regs)      (u16)({unsigned long v; savesegment(gs, v); v;})
+#define set_user_gs(regs, v)   loadsegment(gs, (unsigned long)(v))
+#define task_user_gs(tsk)      ((tsk)->thread.gs)
+#endif
+
 static inline unsigned long get_limit(unsigned long segment)
 {
        unsigned long __limit;