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s390/entry: Make __switch_to() 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 __switch_to().

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 15:41:24 +02:00 committed by Vasily Gorbik
parent 4064b71112
commit 7cc86dee44
1 changed files with 5 additions and 4 deletions
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9
arch/s390/kernel/entry.S
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@ -169,13 +169,14 @@ SYM_FUNC_START(__switch_to_asm)
stg %r15,__THREAD_ksp(%r1,%r2) # store kernel stack of prev
lg %r15,0(%r4,%r3) # start of kernel stack of next
agr %r15,%r5 # end of kernel stack of next
stg %r3,__LC_CURRENT # store task struct of next
stg %r15,__LC_KERNEL_STACK # store end of kernel stack
GET_LC %r13
stg %r3,__LC_CURRENT(%r13) # store task struct of next
stg %r15,__LC_KERNEL_STACK(%r13) # store end of kernel stack
lg %r15,__THREAD_ksp(%r1,%r3) # load kernel stack of next
aghi %r3,__TASK_pid
mvc __LC_CURRENT_PID(4,%r0),0(%r3) # store pid of next
mvc __LC_CURRENT_PID(4,%r13),0(%r3) # store pid of next
ALTERNATIVE "nop", "lpp _LPP_OFFSET(%r13)", ALT_FACILITY(40)
lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task
ALTERNATIVE "nop", "lpp _LPP_OFFSET", ALT_FACILITY(40)
BR_EX %r14
SYM_FUNC_END(__switch_to_asm)