s390/early: Copy last breaking event address to pt_regs

In case of an early crash the early program check handler also prints the
last breaking event address which is contained within the pt_regs
structure. However it is not initialized, and therefore a more or less
random value is printed in case of a crash.

Copy the last breaking event address from lowcore to pt_regs in case of an
early program check to address this. This also makes it easier to analyze
early crashes.

Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 3cf050f7c605901760ad0fa118ca9667c84d3a7e..9adfbdd377dcf6227690e4047ffac72d06a53c81 100644 (file)
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -157,6 +157,7 @@ void __init __do_early_pgm_check(struct pt_regs *regs)
 
        regs->int_code = lc->pgm_int_code;
        regs->int_parm_long = lc->trans_exc_code;
+       regs->last_break = lc->pgm_last_break;
        ip = __rewind_psw(regs->psw, regs->int_code >> 16);
 
        /* Monitor Event? Might be a warning */