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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2010-01-27 10:12:40 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2010-01-27 10:12:49 +0100 |
| commit | 21ec7f6dbf10492ce9a21718040677d3e68bd57d (patch) | |
| tree | 5446637ed4982dc78be84f4bd386b02b8d0027c1 /arch/s390 | |
| parent | 19b123ebacacdce5e75045bfe82122b01c821a5b (diff) | |
| download | blackbird-op-linux-21ec7f6dbf10492ce9a21718040677d3e68bd57d.tar.gz blackbird-op-linux-21ec7f6dbf10492ce9a21718040677d3e68bd57d.zip | |
[S390] fix single stepped svcs with TRACE_IRQFLAGS=y
If irq flags tracing is enabled the TRACE_IRQS_ON macros expands to
a function call which clobbers registers %r0-%r5. The macro is used
in the code path for single stepped system calls. The argument
registers %r2-%r6 need to be restored from the stack before the system
call function is called.
Cc: stable@kernel.org
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/kernel/entry.S | 1 | ||||
| -rw-r--r-- | arch/s390/kernel/entry64.S | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 48215d15762b..e8ef21c51bbe 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -571,6 +571,7 @@ pgm_svcper: mvc __THREAD_per+__PER_access_id(1,%r8),__LC_PER_ACCESS_ID oi __TI_flags+3(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP TRACE_IRQS_ON + lm %r2,%r6,SP_R2(%r15) # load svc arguments stosm __SF_EMPTY(%r15),0x03 # reenable interrupts b BASED(sysc_do_svc) diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index 9aff1d449b6e..f33658f09dd7 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -549,6 +549,7 @@ pgm_svcper: mvc __THREAD_per+__PER_access_id(1,%r8),__LC_PER_ACCESS_ID oi __TI_flags+7(%r9),_TIF_SINGLE_STEP # set TIF_SINGLE_STEP TRACE_IRQS_ON + lmg %r2,%r6,SP_R2(%r15) # load svc arguments stosm __SF_EMPTY(%r15),0x03 # reenable interrupts j sysc_do_svc |
