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| author | Sven Schnelle <svens@linux.ibm.com> | 2024-08-28 13:50:04 +0200 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2024-08-29 22:56:34 +0200 |
| commit | ee3daf7c05e70a0b88723ceb18587aed75716729 (patch) | |
| tree | a3d063aab38a6ee36649009b2ec31c93244638d7 /arch/s390/kernel/entry.S | |
| parent | 56199bb956c3ea82e39c72d2972ebf8c18c6a8c0 (diff) | |
| download | linux-ee3daf7c05e70a0b88723ceb18587aed75716729.tar.gz linux-ee3daf7c05e70a0b88723ceb18587aed75716729.tar.bz2 linux-ee3daf7c05e70a0b88723ceb18587aed75716729.zip | |
s390/entry: Unify save_area_sync and save_area_async
In the past two save areas existed because interrupt handlers
and system call / program check handlers where entered with
interrupts enabled. To prevent a handler from overwriting the
save areas from the previous handler, interrupts used the async
save area, while system call and program check handler used the
sync save area.
Since the removal of critical section cleanup from entry.S, handlers are
entered with interrupts disabled. When the interrupts are re-enabled,
the save area is no longer need. Therefore merge both save areas into one.
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/kernel/entry.S')
| -rw-r--r-- | arch/s390/kernel/entry.S | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 36424e53d63b..42ac4145dfe0 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -264,7 +264,7 @@ EXPORT_SYMBOL(sie_exit) */ SYM_CODE_START(system_call) - STMG_LC %r8,%r15,__LC_SAVE_AREA_SYNC + STMG_LC %r8,%r15,__LC_SAVE_AREA GET_LC %r13 stpt __LC_SYS_ENTER_TIMER(%r13) BPOFF @@ -287,7 +287,7 @@ SYM_CODE_START(system_call) xgr %r10,%r10 xgr %r11,%r11 la %r2,STACK_FRAME_OVERHEAD(%r15) # pointer to pt_regs - mvc __PT_R8(64,%r2),__LC_SAVE_AREA_SYNC(%r13) + mvc __PT_R8(64,%r2),__LC_SAVE_AREA(%r13) MBEAR %r2,%r13 lgr %r3,%r14 brasl %r14,__do_syscall @@ -323,7 +323,7 @@ SYM_CODE_END(ret_from_fork) */ SYM_CODE_START(pgm_check_handler) - STMG_LC %r8,%r15,__LC_SAVE_AREA_SYNC + STMG_LC %r8,%r15,__LC_SAVE_AREA GET_LC %r13 stpt __LC_SYS_ENTER_TIMER(%r13) BPOFF @@ -338,16 +338,16 @@ SYM_CODE_START(pgm_check_handler) jnz 2f # -> enabled, can't be a double fault tm __LC_PGM_ILC+3(%r13),0x80 # check for per exception jnz .Lpgm_svcper # -> single stepped svc -2: CHECK_STACK __LC_SAVE_AREA_SYNC,%r13 +2: CHECK_STACK __LC_SAVE_AREA,%r13 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) # CHECK_VMAP_STACK branches to stack_overflow or 4f - CHECK_VMAP_STACK __LC_SAVE_AREA_SYNC,%r13,4f + CHECK_VMAP_STACK __LC_SAVE_AREA,%r13,4f 3: lg %r15,__LC_KERNEL_STACK(%r13) 4: la %r11,STACK_FRAME_OVERHEAD(%r15) xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) stmg %r0,%r7,__PT_R0(%r11) - mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC(%r13) + mvc __PT_R8(64,%r11),__LC_SAVE_AREA(%r13) mvc __PT_LAST_BREAK(8,%r11),__LC_PGM_LAST_BREAK(%r13) stctg %c1,%c1,__PT_CR1(%r11) #if IS_ENABLED(CONFIG_KVM) @@ -398,7 +398,7 @@ SYM_CODE_END(pgm_check_handler) */ .macro INT_HANDLER name,lc_old_psw,handler SYM_CODE_START(\name) - STMG_LC %r8,%r15,__LC_SAVE_AREA_ASYNC + STMG_LC %r8,%r15,__LC_SAVE_AREA GET_LC %r13 stckf __LC_INT_CLOCK(%r13) stpt __LC_SYS_ENTER_TIMER(%r13) @@ -414,7 +414,7 @@ SYM_CODE_START(\name) BPENTER __SF_SIE_FLAGS(%r15),_TIF_ISOLATE_BP_GUEST SIEEXIT __SF_SIE_CONTROL(%r15),%r13 #endif -0: CHECK_STACK __LC_SAVE_AREA_ASYNC,%r13 +0: CHECK_STACK __LC_SAVE_AREA,%r13 aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE) j 2f 1: lctlg %c1,%c1,__LC_KERNEL_ASCE(%r13) @@ -432,7 +432,7 @@ SYM_CODE_START(\name) xgr %r7,%r7 xgr %r10,%r10 xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11) - mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC(%r13) + mvc __PT_R8(64,%r11),__LC_SAVE_AREA(%r13) MBEAR %r11,%r13 stmg %r8,%r9,__PT_PSW(%r11) lgr %r2,%r11 # pass pointer to pt_regs @@ -601,14 +601,14 @@ SYM_CODE_END(restart_int_handler) __INIT SYM_CODE_START(early_pgm_check_handler) - STMG_LC %r8,%r15,__LC_SAVE_AREA_SYNC + STMG_LC %r8,%r15,__LC_SAVE_AREA GET_LC %r13 aghi %r15,-(STACK_FRAME_OVERHEAD+__PT_SIZE) la %r11,STACK_FRAME_OVERHEAD(%r15) xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) stmg %r0,%r7,__PT_R0(%r11) mvc __PT_PSW(16,%r11),__LC_PGM_OLD_PSW(%r13) - mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC(%r13) + mvc __PT_R8(64,%r11),__LC_SAVE_AREA(%r13) lgr %r2,%r11 brasl %r14,__do_early_pgm_check mvc __LC_RETURN_PSW(16,%r13),STACK_FRAME_OVERHEAD+__PT_PSW(%r15) |