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 <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Alexander Gordeev <[email protected]>

Author: hcahca

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 */