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[S390] Kernel stack overflow handling.

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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>
This commit is contained in:
Heiko Carstens 2006-09-20 15:59:22 +02:00 committed by Martin Schwidefsky
parent 6981e936aa
commit 9514e2311b
1 changed files with 2 additions and 2 deletions
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4
arch/s390/kernel/entry64.S
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@ -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