Print the following line for the stack frame with zero backchain pointer prior to printing PSW and GPRS: KERNEL-MODE INTERRUPT FRAME, pt_regs at <address>: or USER-MODE INTERRUPT FRAME, pt_regs at <address>: Suggested-by: Heiko Carstens <hca(a)linux.ibm.com&gt; Signed-off-by: Mikhail Zaslonko <zaslonko(a)linux.ibm.com&gt; --- s390x.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/s390x.c b/s390x.c index 0e8e2b3..b76edfa 100644 --- a/s390x.c +++ b/s390x.c @@ -1738,6 +1738,7 @@ static unsigned long show_trace(struct bt_info *bt, int cnt, unsigned long sp, /* Check for user PSW */ reg = readmem_ul(sp + MEMBER_OFFSET("pt_regs", "psw")); if (reg & S390X_PSW_MASK_PSTATE) { + fprintf(fp, " USER-MODE INTERRUPT FRAME, pt_regs at %llx:\n", sp); print_ptregs(bt, sp); return sp; } @@ -1750,6 +1751,7 @@ static unsigned long show_trace(struct bt_info *bt, int cnt, unsigned long sp, /* Check for loop (kernel_thread_starter) of second zero bc */ if (low == reg || reg == 0) return reg; + fprintf(fp, " KERNEL-MODE INTERRUPT FRAME, pt_regs at %llx:\n", sp); print_ptregs(bt, sp); low = sp; sp = reg; -- 2.49.0