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authorAnton Arapov <anton@redhat.com>2012-08-07 11:21:50 +0200
committerAnton Arapov <anton@redhat.com>2012-08-07 12:52:25 +0200
commit1d44b6f3fcf6058fb7c960b7558766967e8028f7 (patch)
tree53d88547c973ba048d233091a3f91f3173ad01df /arch/s390/kernel/entry.S
parentd91eda5d7b0383e6a0c83e0146ff141ff3b1355b (diff)
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fedora kernel: 222b075b3ff0d9e88aa9353e3c80667756ed7361v3.5.0-4
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'arch/s390/kernel/entry.S')
-rw-r--r--arch/s390/kernel/entry.S21
1 files changed, 11 insertions, 10 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 74ee563fe62..1ae93b573d7 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -145,22 +145,23 @@ STACK_SIZE = 1 << STACK_SHIFT
* gpr2 = prev
*/
ENTRY(__switch_to)
+ stm %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task
+ st %r15,__THREAD_ksp(%r2) # store kernel stack of prev
l %r4,__THREAD_info(%r2) # get thread_info of prev
l %r5,__THREAD_info(%r3) # get thread_info of next
+ lr %r15,%r5
+ ahi %r15,STACK_SIZE # end of kernel stack of next
+ st %r3,__LC_CURRENT # store task struct of next
+ st %r5,__LC_THREAD_INFO # store thread info of next
+ st %r15,__LC_KERNEL_STACK # store end of kernel stack
+ lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
+ mvc __LC_CURRENT_PID(4,%r0),__TASK_pid(%r3) # store pid of next
+ l %r15,__THREAD_ksp(%r3) # load kernel stack of next
tm __TI_flags+3(%r4),_TIF_MCCK_PENDING # machine check pending?
jz 0f
ni __TI_flags+3(%r4),255-_TIF_MCCK_PENDING # clear flag in prev
oi __TI_flags+3(%r5),_TIF_MCCK_PENDING # set it in next
-0: stm %r6,%r15,__SF_GPRS(%r15) # store gprs of prev task
- st %r15,__THREAD_ksp(%r2) # store kernel stack of prev
- l %r15,__THREAD_ksp(%r3) # load kernel stack of next
- lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4
- lm %r6,%r15,__SF_GPRS(%r15) # load gprs of next task
- st %r3,__LC_CURRENT # store task struct of next
- mvc __LC_CURRENT_PID(4,%r0),__TASK_pid(%r3) # store pid of next
- st %r5,__LC_THREAD_INFO # store thread info of next
- ahi %r5,STACK_SIZE # end of kernel stack of next
- st %r5,__LC_KERNEL_STACK # store end of kernel stack
+0: lm %r6,%r15,__SF_GPRS(%r15) # load gprs of next task
br %r14
__critical_start: