s390/entry.S: factor out SIEEXIT macro

Factor out SIEEXIT macro and use it instead of cleanup_sie
routine. As a side effect %r13 and %r14 are spared.

Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Christia Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 3e8c666..3287cb0 100644 (file)
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -148,6 +148,13 @@ _LPP_OFFSET        = __LC_LPP
        clgr    %r14,%r13
        jhe     \outside_label
        .endm
+
+       .macro SIEEXIT
+       lg      %r9,__SF_SIE_CONTROL(%r15)      # get control block pointer
+       ni      __SIE_PROG0C+3(%r9),0xfe        # no longer in SIE
+       lctlg   %c1,%c1,__LC_KERNEL_ASCE        # load primary asce
+       larl    %r9,sie_exit                    # skip forward to sie_exit
+       .endm
 #endif
 
        GEN_BR_THUNK %r14
@@ -235,7 +242,6 @@ ENTRY(sie64a)
 # are some corner cases (e.g. runtime instrumentation) where ILC is unpredictable.
 # Other instructions between sie64a and .Lsie_done should not cause program
 # interrupts. So lets use 3 nops as a landing pad for all possible rewinds.
-# See also .Lcleanup_sie
 .Lrewind_pad6:
        nopr    7
 .Lrewind_pad4:
@@ -341,10 +347,7 @@ ENTRY(pgm_check_handler)
 #if IS_ENABLED(CONFIG_KVM)
        # cleanup critical section for program checks in sie64a
        OUTSIDE %r9,.Lsie_gmap,.Lsie_done,1f
-       lg      %r14,__SF_SIE_CONTROL(%r15)     # get control block pointer
-       ni      __SIE_PROG0C+3(%r14),0xfe       # no longer in SIE
-       lctlg   %c1,%c1,__LC_KERNEL_ASCE        # load primary asce
-       larl    %r9,sie_exit                    # skip forward to sie_exit
+       SIEEXIT
        lghi    %r10,_PIF_GUEST_FAULT
 #endif
 1:     tmhh    %r8,0x4000              # PER bit set in old PSW ?
@@ -410,7 +413,8 @@ ENTRY(\name)
        jnz     1f
 #if IS_ENABLED(CONFIG_KVM)
        OUTSIDE %r9,.Lsie_gmap,.Lsie_done,0f
-       brasl   %r14,.Lcleanup_sie
+       BPENTER __SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST)
+       SIEEXIT
 #endif
 0:     CHECK_STACK __LC_SAVE_AREA_ASYNC
        aghi    %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
@@ -556,7 +560,8 @@ ENTRY(mcck_int_handler)
        OUTSIDE %r9,.Lsie_gmap,.Lsie_done,.Lmcck_stack
        OUTSIDE %r9,.Lsie_entry,.Lsie_skip,5f
        oi      __LC_CPU_FLAGS+7, _CIF_MCCK_GUEST
-5:     brasl   %r14,.Lcleanup_sie
+5:     BPENTER __SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST)
+       SIEEXIT
 #endif
        j       .Lmcck_stack
 .Lmcck_user:
@@ -657,15 +662,6 @@ ENTRY(stack_overflow)
 ENDPROC(stack_overflow)
 #endif
 
-#if IS_ENABLED(CONFIG_KVM)
-.Lcleanup_sie:
-       BPENTER __SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST)
-       lg      %r9,__SF_SIE_CONTROL(%r15)      # get control block pointer
-       ni      __SIE_PROG0C+3(%r9),0xfe        # no longer in SIE
-       lctlg   %c1,%c1,__LC_KERNEL_ASCE
-       larl    %r9,sie_exit                    # skip forward to sie_exit
-       BR_EX   %r14,%r13
-#endif
        .section .rodata, "a"
 #define SYSCALL(esame,emu)     .quad __s390x_ ## esame
        .globl  sys_call_table