+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ /*
+ * There is no particular reason for this code to be here, other than
+ * that there happens to be space here that would go unused otherwise.
+ * If this fault ever gets "unreserved", simply moved the following
+ * code to a more suitable spot...
+ *
+ * account_sys_enter is called from SAVE_MIN* macros if accounting is
+ * enabled and if the macro is entered from user mode.
+ */
+ENTRY(account_sys_enter)
+ // mov.m r20=ar.itc is called in advance, and r13 is current
+ add r16=TI_AC_STAMP+IA64_TASK_SIZE,r13
+ add r17=TI_AC_LEAVE+IA64_TASK_SIZE,r13
+ ;;
+ ld8 r18=[r16],TI_AC_STIME-TI_AC_STAMP // time at last check in kernel
+ ld8 r19=[r17],TI_AC_UTIME-TI_AC_LEAVE // time at left from kernel
+ ;;
+ ld8 r23=[r16],TI_AC_STAMP-TI_AC_STIME // cumulated stime
+ ld8 r21=[r17] // cumulated utime
+ sub r22=r19,r18 // stime before leave kernel
+ ;;
+ st8 [r16]=r20,TI_AC_STIME-TI_AC_STAMP // update stamp
+ sub r18=r20,r19 // elapsed time in user mode
+ ;;
+ add r23=r23,r22 // sum stime
+ add r21=r21,r18 // sum utime
+ ;;
+ st8 [r16]=r23 // update stime
+ st8 [r17]=r21 // update utime
+ ;;
+ br.ret.sptk.many rp
+END(account_sys_enter)
+#endif
+