[S390] system call optimization.
After the in-kernel system call has been remove the system call path can be optimized. The problem state bit of the old psw is always set between system_call and sysc_do_svc. SAVE_ALL_SVC uses this information to avoid two instructions. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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@ -107,6 +107,11 @@ STACK_SIZE = 1 << STACK_SHIFT
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l %r13,__LC_SVC_NEW_PSW+4 # load &system_call to %r13
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.endm
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.macro SAVE_ALL_SVC psworg,savearea
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la %r12,\psworg
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l %r15,__LC_KERNEL_STACK # problem state -> load ksp
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.endm
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.macro SAVE_ALL_SYNC psworg,savearea
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la %r12,\psworg
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tm \psworg+1,0x01 # test problem state bit
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@ -218,7 +223,7 @@ system_call:
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STORE_TIMER __LC_SYNC_ENTER_TIMER
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sysc_saveall:
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SAVE_ALL_BASE __LC_SAVE_AREA
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SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
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SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
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CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
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lh %r7,0x8a # get svc number from lowcore
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#ifdef CONFIG_VIRT_CPU_ACCOUNTING
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@ -99,6 +99,11 @@ _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK | _TIF_NEED_RESCHED | \
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larl %r13,system_call
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.endm
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.macro SAVE_ALL_SVC psworg,savearea
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la %r12,\psworg
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lg %r15,__LC_KERNEL_STACK # problem state -> load ksp
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.endm
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.macro SAVE_ALL_SYNC psworg,savearea
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la %r12,\psworg
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tm \psworg+1,0x01 # test problem state bit
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@ -207,7 +212,7 @@ system_call:
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STORE_TIMER __LC_SYNC_ENTER_TIMER
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sysc_saveall:
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SAVE_ALL_BASE __LC_SAVE_AREA
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SAVE_ALL_SYNC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
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SAVE_ALL_SVC __LC_SVC_OLD_PSW,__LC_SAVE_AREA
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CREATE_STACK_FRAME __LC_SVC_OLD_PSW,__LC_SAVE_AREA
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llgh %r7,__LC_SVC_INT_CODE # get svc number from lowcore
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#ifdef CONFIG_VIRT_CPU_ACCOUNTING
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