+#else /* __ASSEMBLY__ */
+
+/*
+ * GET_DESC_BASE reads the descriptor base of the specified segment.
+ *
+ * Args:
+ * idx - descriptor index
+ * gdt - GDT pointer
+ * base - 32bit register to which the base will be written
+ * lo_w - lo word of the "base" register
+ * lo_b - lo byte of the "base" register
+ * hi_b - hi byte of the low word of the "base" register
+ *
+ * Example:
+ * GET_DESC_BASE(GDT_ENTRY_ESPFIX_SS, %ebx, %eax, %ax, %al, %ah)
+ * Will read the base address of GDT_ENTRY_ESPFIX_SS and put it into %eax.
+ */
+#define GET_DESC_BASE(idx, gdt, base, lo_w, lo_b, hi_b) \
+ movb idx*8+4(gdt), lo_b; \
+ movb idx*8+7(gdt), hi_b; \
+ shll $16, base; \
+ movw idx*8+2(gdt), lo_w;
+