Hello Dave, The output of CPU timer and clock comparator has always been incorrect because: - We added S390X_WORD_SIZE (8) instead of 4 to get the second word - We did not left shift the clock comparator by 8 So fix this by getting the complete 64 bit values and by shifting the clock comparator correctly. Signed-off-by: Michael Holzheu <holzheu(a)linux.vnet.ibm.com&gt; --- s390x.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) --- a/s390x.c +++ b/s390x.c @@ -1343,14 +1343,16 @@ s390x_print_lowcore(char* lc, struct bt_ fprintf(fp," -prefix : %#010lx\n", tmp[0]); ptr = lc + MEMBER_OFFSET(lc_struct, "cpu_timer_save_area"); - tmp[0]=UINT(ptr); - tmp[1]=UINT(ptr + S390X_WORD_SIZE); - fprintf(fp," -cpu timer: %#010lx %#010lx\n", tmp[0],tmp[1]); + tmp[0]=ULONG(ptr); + fprintf(fp," -cpu timer: %#018lx\n", tmp[0]); ptr = lc + MEMBER_OFFSET(lc_struct, "clock_comp_save_area"); - tmp[0]=UINT(ptr); - tmp[1]=UINT(ptr + S390X_WORD_SIZE); - fprintf(fp," -clock cmp: %#010lx %#010lx\n", tmp[0], tmp[1]); + /* + * Shift clock comparator by 8 because we got bit positions 0-55 + * in byte 1 to 8. The first byte is always zero. + */ + tmp[0]=ULONG(ptr) << 8; + fprintf(fp," -clock cmp: %#018lx\n", tmp[0]); fprintf(fp," -general registers:\n"); ptr = lc + MEMBER_OFFSET(lc_struct, "gpregs_save_area");