-#define GET_GLOBAL(var) \
- GET_VAR(CS, (var))
-#define SET_GLOBAL(var, val) do { \
- extern void __force_link_error__set_global_only_in_32bit(); \
- if (MODE16) \
- __force_link_error__set_global_only_in_32bit(); \
- (var) = (val); \
+#if MODE16 == 0 && MODESEGMENT == 1
+// In 32bit segmented mode %cs may not be readable and the code may be
+// relocated. The entry code sets up %gs with a readable segment and
+// the code offset can be determined by get_global_offset().
+#define GLOBAL_SEGREG GS
+static inline u32 __attribute_const get_global_offset(void) {
+ u32 ret;
+ asm(" calll 1f\n"
+ "1:popl %0\n"
+ " subl $1b, %0"
+ : "=r"(ret));
+ return ret;
+}
+#else
+#define GLOBAL_SEGREG CS
+static inline u32 __attribute_const get_global_offset(void) {
+ return 0;
+}
+#endif
+static inline u16 get_global_seg(void) {
+ return GET_SEG(GLOBAL_SEGREG);
+}
+#define GET_GLOBAL(var) \
+ GET_VAR(GLOBAL_SEGREG, *(typeof(&(var)))((void*)&(var) \
+ + get_global_offset()))
+#define SET_GLOBAL(var, val) do { \
+ ASSERT32FLAT(); \
+ (var) = (val); \