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s390/entry: Make ret_from_fork() ready for lowcore relocation

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In preparation of having lowcore at different address than zero,
add the base register to all lowcore accesses in ret_from_fork().

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Sven Schnelle 2024-07-22 15:41:25 +02:00 committed by Vasily Gorbik
parent 7cc86dee44
commit 9b3dcae128
1 changed files with 4 additions and 3 deletions
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7
arch/s390/kernel/entry.S
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@ -307,12 +307,13 @@ SYM_CODE_START(ret_from_fork)
lgr %r3,%r11
brasl %r14,__ret_from_fork
STACKLEAK_ERASE
lctlg %c1,%c1,__LC_USER_ASCE
mvc __LC_RETURN_PSW(16),STACK_FRAME_OVERHEAD+__PT_PSW(%r15)
GET_LC %r13
lctlg %c1,%c1,__LC_USER_ASCE(%r13)
mvc __LC_RETURN_PSW(16,%r13),STACK_FRAME_OVERHEAD+__PT_PSW(%r15)
BPON
LBEAR STACK_FRAME_OVERHEAD+__PT_LAST_BREAK(%r15)
stpt __LC_EXIT_TIMER(%r13)
lmg %r0,%r15,STACK_FRAME_OVERHEAD+__PT_R0(%r15)
stpt __LC_EXIT_TIMER
LPSWEY __LC_RETURN_PSW,__LC_RETURN_LPSWE
SYM_CODE_END(ret_from_fork)