[S390] Kernel stack overflow handling.

Substract the size of the initial stack frame from the correct
register. Otherwise we will end up in a program check loop.
Fix the offset into the save area as well.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index 8b956d1538f5..29bbfbab7332 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -827,7 +827,7 @@ restart_go:
  */
 stack_overflow:
         lg      %r15,__LC_PANIC_STACK   # change to panic stack
-        aghi    %r1,-SP_SIZE
+        aghi    %r15,-SP_SIZE
         mvc     SP_PSW(16,%r15),0(%r12) # move user PSW to stack
         stmg    %r0,%r11,SP_R0(%r15)    # store gprs %r0-%r11 to kernel stack
         la      %r1,__LC_SAVE_AREA
@@ -835,7 +835,7 @@ stack_overflow:
         je      0f
         chi     %r12,__LC_PGM_OLD_PSW
         je      0f
-        la      %r1,__LC_SAVE_AREA+16
+        la      %r1,__LC_SAVE_AREA+32
 0:      mvc     SP_R12(32,%r15),0(%r1)  # move %r12-%r15 to stack
         xc      __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) # clear back chain
         la      %r2,SP_PTREGS(%r15)     # load pt_regs