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Commit 9514e231 authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

[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: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 6981e936

arch/s390/kernel/entry64.S

+2 −2
Original line number Diff line number Diff line
@@ -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