[PATCH 1/2] s390/entry: Last breaking event vs invalid kernel stack

[Heiko Carstens]

In case an invalid kernel stack is detected the last breaking event
address is copied to the orig_gpr2 member of the generated pt_regs
structure. Correct location would be last_break. Fix this.

This adds help information to the printed messages:

Before:
Kernel stack pointer invalid
...
Last Breaking-Event-Address:
 [<0000000000000000>] 0x0

After:
Kernel stack pointer invalid
...
Last Breaking-Event-Address:
 [<000001b802c1ae1c>] proc_reg_write+0x5c/0xd0

Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
---
 arch/s390/kernel/entry.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 10dd9bbdf985..4e99ed559dbd 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -622,7 +622,7 @@ SYM_CODE_START(stack_invalid)
 	stmg	%r8,%r9,__PT_PSW(%r11)
 	mvc	__PT_R8(64,%r11),0(%r14)
 	GET_LC	%r2
-	mvc	__PT_ORIG_GPR2(8,%r11),__LC_PGM_LAST_BREAK(%r2)
+	mvc	__PT_LAST_BREAK(8,%r11),__LC_PGM_LAST_BREAK(%r2)
 	xc	__SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
 	lgr	%r2,%r11		# pass pointer to pt_regs
 	jg	kernel_stack_invalid
-- 
2.53.0